| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tracing-0.1.37/src/span.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>span.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../tracing/index.html"><div class="logo-container"> |
| <img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../tracing/index.html"> |
| <img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| <span id="324">324</span> |
| <span id="325">325</span> |
| <span id="326">326</span> |
| <span id="327">327</span> |
| <span id="328">328</span> |
| <span id="329">329</span> |
| <span id="330">330</span> |
| <span id="331">331</span> |
| <span id="332">332</span> |
| <span id="333">333</span> |
| <span id="334">334</span> |
| <span id="335">335</span> |
| <span id="336">336</span> |
| <span id="337">337</span> |
| <span id="338">338</span> |
| <span id="339">339</span> |
| <span id="340">340</span> |
| <span id="341">341</span> |
| <span id="342">342</span> |
| <span id="343">343</span> |
| <span id="344">344</span> |
| <span id="345">345</span> |
| <span id="346">346</span> |
| <span id="347">347</span> |
| <span id="348">348</span> |
| <span id="349">349</span> |
| <span id="350">350</span> |
| <span id="351">351</span> |
| <span id="352">352</span> |
| <span id="353">353</span> |
| <span id="354">354</span> |
| <span id="355">355</span> |
| <span id="356">356</span> |
| <span id="357">357</span> |
| <span id="358">358</span> |
| <span id="359">359</span> |
| <span id="360">360</span> |
| <span id="361">361</span> |
| <span id="362">362</span> |
| <span id="363">363</span> |
| <span id="364">364</span> |
| <span id="365">365</span> |
| <span id="366">366</span> |
| <span id="367">367</span> |
| <span id="368">368</span> |
| <span id="369">369</span> |
| <span id="370">370</span> |
| <span id="371">371</span> |
| <span id="372">372</span> |
| <span id="373">373</span> |
| <span id="374">374</span> |
| <span id="375">375</span> |
| <span id="376">376</span> |
| <span id="377">377</span> |
| <span id="378">378</span> |
| <span id="379">379</span> |
| <span id="380">380</span> |
| <span id="381">381</span> |
| <span id="382">382</span> |
| <span id="383">383</span> |
| <span id="384">384</span> |
| <span id="385">385</span> |
| <span id="386">386</span> |
| <span id="387">387</span> |
| <span id="388">388</span> |
| <span id="389">389</span> |
| <span id="390">390</span> |
| <span id="391">391</span> |
| <span id="392">392</span> |
| <span id="393">393</span> |
| <span id="394">394</span> |
| <span id="395">395</span> |
| <span id="396">396</span> |
| <span id="397">397</span> |
| <span id="398">398</span> |
| <span id="399">399</span> |
| <span id="400">400</span> |
| <span id="401">401</span> |
| <span id="402">402</span> |
| <span id="403">403</span> |
| <span id="404">404</span> |
| <span id="405">405</span> |
| <span id="406">406</span> |
| <span id="407">407</span> |
| <span id="408">408</span> |
| <span id="409">409</span> |
| <span id="410">410</span> |
| <span id="411">411</span> |
| <span id="412">412</span> |
| <span id="413">413</span> |
| <span id="414">414</span> |
| <span id="415">415</span> |
| <span id="416">416</span> |
| <span id="417">417</span> |
| <span id="418">418</span> |
| <span id="419">419</span> |
| <span id="420">420</span> |
| <span id="421">421</span> |
| <span id="422">422</span> |
| <span id="423">423</span> |
| <span id="424">424</span> |
| <span id="425">425</span> |
| <span id="426">426</span> |
| <span id="427">427</span> |
| <span id="428">428</span> |
| <span id="429">429</span> |
| <span id="430">430</span> |
| <span id="431">431</span> |
| <span id="432">432</span> |
| <span id="433">433</span> |
| <span id="434">434</span> |
| <span id="435">435</span> |
| <span id="436">436</span> |
| <span id="437">437</span> |
| <span id="438">438</span> |
| <span id="439">439</span> |
| <span id="440">440</span> |
| <span id="441">441</span> |
| <span id="442">442</span> |
| <span id="443">443</span> |
| <span id="444">444</span> |
| <span id="445">445</span> |
| <span id="446">446</span> |
| <span id="447">447</span> |
| <span id="448">448</span> |
| <span id="449">449</span> |
| <span id="450">450</span> |
| <span id="451">451</span> |
| <span id="452">452</span> |
| <span id="453">453</span> |
| <span id="454">454</span> |
| <span id="455">455</span> |
| <span id="456">456</span> |
| <span id="457">457</span> |
| <span id="458">458</span> |
| <span id="459">459</span> |
| <span id="460">460</span> |
| <span id="461">461</span> |
| <span id="462">462</span> |
| <span id="463">463</span> |
| <span id="464">464</span> |
| <span id="465">465</span> |
| <span id="466">466</span> |
| <span id="467">467</span> |
| <span id="468">468</span> |
| <span id="469">469</span> |
| <span id="470">470</span> |
| <span id="471">471</span> |
| <span id="472">472</span> |
| <span id="473">473</span> |
| <span id="474">474</span> |
| <span id="475">475</span> |
| <span id="476">476</span> |
| <span id="477">477</span> |
| <span id="478">478</span> |
| <span id="479">479</span> |
| <span id="480">480</span> |
| <span id="481">481</span> |
| <span id="482">482</span> |
| <span id="483">483</span> |
| <span id="484">484</span> |
| <span id="485">485</span> |
| <span id="486">486</span> |
| <span id="487">487</span> |
| <span id="488">488</span> |
| <span id="489">489</span> |
| <span id="490">490</span> |
| <span id="491">491</span> |
| <span id="492">492</span> |
| <span id="493">493</span> |
| <span id="494">494</span> |
| <span id="495">495</span> |
| <span id="496">496</span> |
| <span id="497">497</span> |
| <span id="498">498</span> |
| <span id="499">499</span> |
| <span id="500">500</span> |
| <span id="501">501</span> |
| <span id="502">502</span> |
| <span id="503">503</span> |
| <span id="504">504</span> |
| <span id="505">505</span> |
| <span id="506">506</span> |
| <span id="507">507</span> |
| <span id="508">508</span> |
| <span id="509">509</span> |
| <span id="510">510</span> |
| <span id="511">511</span> |
| <span id="512">512</span> |
| <span id="513">513</span> |
| <span id="514">514</span> |
| <span id="515">515</span> |
| <span id="516">516</span> |
| <span id="517">517</span> |
| <span id="518">518</span> |
| <span id="519">519</span> |
| <span id="520">520</span> |
| <span id="521">521</span> |
| <span id="522">522</span> |
| <span id="523">523</span> |
| <span id="524">524</span> |
| <span id="525">525</span> |
| <span id="526">526</span> |
| <span id="527">527</span> |
| <span id="528">528</span> |
| <span id="529">529</span> |
| <span id="530">530</span> |
| <span id="531">531</span> |
| <span id="532">532</span> |
| <span id="533">533</span> |
| <span id="534">534</span> |
| <span id="535">535</span> |
| <span id="536">536</span> |
| <span id="537">537</span> |
| <span id="538">538</span> |
| <span id="539">539</span> |
| <span id="540">540</span> |
| <span id="541">541</span> |
| <span id="542">542</span> |
| <span id="543">543</span> |
| <span id="544">544</span> |
| <span id="545">545</span> |
| <span id="546">546</span> |
| <span id="547">547</span> |
| <span id="548">548</span> |
| <span id="549">549</span> |
| <span id="550">550</span> |
| <span id="551">551</span> |
| <span id="552">552</span> |
| <span id="553">553</span> |
| <span id="554">554</span> |
| <span id="555">555</span> |
| <span id="556">556</span> |
| <span id="557">557</span> |
| <span id="558">558</span> |
| <span id="559">559</span> |
| <span id="560">560</span> |
| <span id="561">561</span> |
| <span id="562">562</span> |
| <span id="563">563</span> |
| <span id="564">564</span> |
| <span id="565">565</span> |
| <span id="566">566</span> |
| <span id="567">567</span> |
| <span id="568">568</span> |
| <span id="569">569</span> |
| <span id="570">570</span> |
| <span id="571">571</span> |
| <span id="572">572</span> |
| <span id="573">573</span> |
| <span id="574">574</span> |
| <span id="575">575</span> |
| <span id="576">576</span> |
| <span id="577">577</span> |
| <span id="578">578</span> |
| <span id="579">579</span> |
| <span id="580">580</span> |
| <span id="581">581</span> |
| <span id="582">582</span> |
| <span id="583">583</span> |
| <span id="584">584</span> |
| <span id="585">585</span> |
| <span id="586">586</span> |
| <span id="587">587</span> |
| <span id="588">588</span> |
| <span id="589">589</span> |
| <span id="590">590</span> |
| <span id="591">591</span> |
| <span id="592">592</span> |
| <span id="593">593</span> |
| <span id="594">594</span> |
| <span id="595">595</span> |
| <span id="596">596</span> |
| <span id="597">597</span> |
| <span id="598">598</span> |
| <span id="599">599</span> |
| <span id="600">600</span> |
| <span id="601">601</span> |
| <span id="602">602</span> |
| <span id="603">603</span> |
| <span id="604">604</span> |
| <span id="605">605</span> |
| <span id="606">606</span> |
| <span id="607">607</span> |
| <span id="608">608</span> |
| <span id="609">609</span> |
| <span id="610">610</span> |
| <span id="611">611</span> |
| <span id="612">612</span> |
| <span id="613">613</span> |
| <span id="614">614</span> |
| <span id="615">615</span> |
| <span id="616">616</span> |
| <span id="617">617</span> |
| <span id="618">618</span> |
| <span id="619">619</span> |
| <span id="620">620</span> |
| <span id="621">621</span> |
| <span id="622">622</span> |
| <span id="623">623</span> |
| <span id="624">624</span> |
| <span id="625">625</span> |
| <span id="626">626</span> |
| <span id="627">627</span> |
| <span id="628">628</span> |
| <span id="629">629</span> |
| <span id="630">630</span> |
| <span id="631">631</span> |
| <span id="632">632</span> |
| <span id="633">633</span> |
| <span id="634">634</span> |
| <span id="635">635</span> |
| <span id="636">636</span> |
| <span id="637">637</span> |
| <span id="638">638</span> |
| <span id="639">639</span> |
| <span id="640">640</span> |
| <span id="641">641</span> |
| <span id="642">642</span> |
| <span id="643">643</span> |
| <span id="644">644</span> |
| <span id="645">645</span> |
| <span id="646">646</span> |
| <span id="647">647</span> |
| <span id="648">648</span> |
| <span id="649">649</span> |
| <span id="650">650</span> |
| <span id="651">651</span> |
| <span id="652">652</span> |
| <span id="653">653</span> |
| <span id="654">654</span> |
| <span id="655">655</span> |
| <span id="656">656</span> |
| <span id="657">657</span> |
| <span id="658">658</span> |
| <span id="659">659</span> |
| <span id="660">660</span> |
| <span id="661">661</span> |
| <span id="662">662</span> |
| <span id="663">663</span> |
| <span id="664">664</span> |
| <span id="665">665</span> |
| <span id="666">666</span> |
| <span id="667">667</span> |
| <span id="668">668</span> |
| <span id="669">669</span> |
| <span id="670">670</span> |
| <span id="671">671</span> |
| <span id="672">672</span> |
| <span id="673">673</span> |
| <span id="674">674</span> |
| <span id="675">675</span> |
| <span id="676">676</span> |
| <span id="677">677</span> |
| <span id="678">678</span> |
| <span id="679">679</span> |
| <span id="680">680</span> |
| <span id="681">681</span> |
| <span id="682">682</span> |
| <span id="683">683</span> |
| <span id="684">684</span> |
| <span id="685">685</span> |
| <span id="686">686</span> |
| <span id="687">687</span> |
| <span id="688">688</span> |
| <span id="689">689</span> |
| <span id="690">690</span> |
| <span id="691">691</span> |
| <span id="692">692</span> |
| <span id="693">693</span> |
| <span id="694">694</span> |
| <span id="695">695</span> |
| <span id="696">696</span> |
| <span id="697">697</span> |
| <span id="698">698</span> |
| <span id="699">699</span> |
| <span id="700">700</span> |
| <span id="701">701</span> |
| <span id="702">702</span> |
| <span id="703">703</span> |
| <span id="704">704</span> |
| <span id="705">705</span> |
| <span id="706">706</span> |
| <span id="707">707</span> |
| <span id="708">708</span> |
| <span id="709">709</span> |
| <span id="710">710</span> |
| <span id="711">711</span> |
| <span id="712">712</span> |
| <span id="713">713</span> |
| <span id="714">714</span> |
| <span id="715">715</span> |
| <span id="716">716</span> |
| <span id="717">717</span> |
| <span id="718">718</span> |
| <span id="719">719</span> |
| <span id="720">720</span> |
| <span id="721">721</span> |
| <span id="722">722</span> |
| <span id="723">723</span> |
| <span id="724">724</span> |
| <span id="725">725</span> |
| <span id="726">726</span> |
| <span id="727">727</span> |
| <span id="728">728</span> |
| <span id="729">729</span> |
| <span id="730">730</span> |
| <span id="731">731</span> |
| <span id="732">732</span> |
| <span id="733">733</span> |
| <span id="734">734</span> |
| <span id="735">735</span> |
| <span id="736">736</span> |
| <span id="737">737</span> |
| <span id="738">738</span> |
| <span id="739">739</span> |
| <span id="740">740</span> |
| <span id="741">741</span> |
| <span id="742">742</span> |
| <span id="743">743</span> |
| <span id="744">744</span> |
| <span id="745">745</span> |
| <span id="746">746</span> |
| <span id="747">747</span> |
| <span id="748">748</span> |
| <span id="749">749</span> |
| <span id="750">750</span> |
| <span id="751">751</span> |
| <span id="752">752</span> |
| <span id="753">753</span> |
| <span id="754">754</span> |
| <span id="755">755</span> |
| <span id="756">756</span> |
| <span id="757">757</span> |
| <span id="758">758</span> |
| <span id="759">759</span> |
| <span id="760">760</span> |
| <span id="761">761</span> |
| <span id="762">762</span> |
| <span id="763">763</span> |
| <span id="764">764</span> |
| <span id="765">765</span> |
| <span id="766">766</span> |
| <span id="767">767</span> |
| <span id="768">768</span> |
| <span id="769">769</span> |
| <span id="770">770</span> |
| <span id="771">771</span> |
| <span id="772">772</span> |
| <span id="773">773</span> |
| <span id="774">774</span> |
| <span id="775">775</span> |
| <span id="776">776</span> |
| <span id="777">777</span> |
| <span id="778">778</span> |
| <span id="779">779</span> |
| <span id="780">780</span> |
| <span id="781">781</span> |
| <span id="782">782</span> |
| <span id="783">783</span> |
| <span id="784">784</span> |
| <span id="785">785</span> |
| <span id="786">786</span> |
| <span id="787">787</span> |
| <span id="788">788</span> |
| <span id="789">789</span> |
| <span id="790">790</span> |
| <span id="791">791</span> |
| <span id="792">792</span> |
| <span id="793">793</span> |
| <span id="794">794</span> |
| <span id="795">795</span> |
| <span id="796">796</span> |
| <span id="797">797</span> |
| <span id="798">798</span> |
| <span id="799">799</span> |
| <span id="800">800</span> |
| <span id="801">801</span> |
| <span id="802">802</span> |
| <span id="803">803</span> |
| <span id="804">804</span> |
| <span id="805">805</span> |
| <span id="806">806</span> |
| <span id="807">807</span> |
| <span id="808">808</span> |
| <span id="809">809</span> |
| <span id="810">810</span> |
| <span id="811">811</span> |
| <span id="812">812</span> |
| <span id="813">813</span> |
| <span id="814">814</span> |
| <span id="815">815</span> |
| <span id="816">816</span> |
| <span id="817">817</span> |
| <span id="818">818</span> |
| <span id="819">819</span> |
| <span id="820">820</span> |
| <span id="821">821</span> |
| <span id="822">822</span> |
| <span id="823">823</span> |
| <span id="824">824</span> |
| <span id="825">825</span> |
| <span id="826">826</span> |
| <span id="827">827</span> |
| <span id="828">828</span> |
| <span id="829">829</span> |
| <span id="830">830</span> |
| <span id="831">831</span> |
| <span id="832">832</span> |
| <span id="833">833</span> |
| <span id="834">834</span> |
| <span id="835">835</span> |
| <span id="836">836</span> |
| <span id="837">837</span> |
| <span id="838">838</span> |
| <span id="839">839</span> |
| <span id="840">840</span> |
| <span id="841">841</span> |
| <span id="842">842</span> |
| <span id="843">843</span> |
| <span id="844">844</span> |
| <span id="845">845</span> |
| <span id="846">846</span> |
| <span id="847">847</span> |
| <span id="848">848</span> |
| <span id="849">849</span> |
| <span id="850">850</span> |
| <span id="851">851</span> |
| <span id="852">852</span> |
| <span id="853">853</span> |
| <span id="854">854</span> |
| <span id="855">855</span> |
| <span id="856">856</span> |
| <span id="857">857</span> |
| <span id="858">858</span> |
| <span id="859">859</span> |
| <span id="860">860</span> |
| <span id="861">861</span> |
| <span id="862">862</span> |
| <span id="863">863</span> |
| <span id="864">864</span> |
| <span id="865">865</span> |
| <span id="866">866</span> |
| <span id="867">867</span> |
| <span id="868">868</span> |
| <span id="869">869</span> |
| <span id="870">870</span> |
| <span id="871">871</span> |
| <span id="872">872</span> |
| <span id="873">873</span> |
| <span id="874">874</span> |
| <span id="875">875</span> |
| <span id="876">876</span> |
| <span id="877">877</span> |
| <span id="878">878</span> |
| <span id="879">879</span> |
| <span id="880">880</span> |
| <span id="881">881</span> |
| <span id="882">882</span> |
| <span id="883">883</span> |
| <span id="884">884</span> |
| <span id="885">885</span> |
| <span id="886">886</span> |
| <span id="887">887</span> |
| <span id="888">888</span> |
| <span id="889">889</span> |
| <span id="890">890</span> |
| <span id="891">891</span> |
| <span id="892">892</span> |
| <span id="893">893</span> |
| <span id="894">894</span> |
| <span id="895">895</span> |
| <span id="896">896</span> |
| <span id="897">897</span> |
| <span id="898">898</span> |
| <span id="899">899</span> |
| <span id="900">900</span> |
| <span id="901">901</span> |
| <span id="902">902</span> |
| <span id="903">903</span> |
| <span id="904">904</span> |
| <span id="905">905</span> |
| <span id="906">906</span> |
| <span id="907">907</span> |
| <span id="908">908</span> |
| <span id="909">909</span> |
| <span id="910">910</span> |
| <span id="911">911</span> |
| <span id="912">912</span> |
| <span id="913">913</span> |
| <span id="914">914</span> |
| <span id="915">915</span> |
| <span id="916">916</span> |
| <span id="917">917</span> |
| <span id="918">918</span> |
| <span id="919">919</span> |
| <span id="920">920</span> |
| <span id="921">921</span> |
| <span id="922">922</span> |
| <span id="923">923</span> |
| <span id="924">924</span> |
| <span id="925">925</span> |
| <span id="926">926</span> |
| <span id="927">927</span> |
| <span id="928">928</span> |
| <span id="929">929</span> |
| <span id="930">930</span> |
| <span id="931">931</span> |
| <span id="932">932</span> |
| <span id="933">933</span> |
| <span id="934">934</span> |
| <span id="935">935</span> |
| <span id="936">936</span> |
| <span id="937">937</span> |
| <span id="938">938</span> |
| <span id="939">939</span> |
| <span id="940">940</span> |
| <span id="941">941</span> |
| <span id="942">942</span> |
| <span id="943">943</span> |
| <span id="944">944</span> |
| <span id="945">945</span> |
| <span id="946">946</span> |
| <span id="947">947</span> |
| <span id="948">948</span> |
| <span id="949">949</span> |
| <span id="950">950</span> |
| <span id="951">951</span> |
| <span id="952">952</span> |
| <span id="953">953</span> |
| <span id="954">954</span> |
| <span id="955">955</span> |
| <span id="956">956</span> |
| <span id="957">957</span> |
| <span id="958">958</span> |
| <span id="959">959</span> |
| <span id="960">960</span> |
| <span id="961">961</span> |
| <span id="962">962</span> |
| <span id="963">963</span> |
| <span id="964">964</span> |
| <span id="965">965</span> |
| <span id="966">966</span> |
| <span id="967">967</span> |
| <span id="968">968</span> |
| <span id="969">969</span> |
| <span id="970">970</span> |
| <span id="971">971</span> |
| <span id="972">972</span> |
| <span id="973">973</span> |
| <span id="974">974</span> |
| <span id="975">975</span> |
| <span id="976">976</span> |
| <span id="977">977</span> |
| <span id="978">978</span> |
| <span id="979">979</span> |
| <span id="980">980</span> |
| <span id="981">981</span> |
| <span id="982">982</span> |
| <span id="983">983</span> |
| <span id="984">984</span> |
| <span id="985">985</span> |
| <span id="986">986</span> |
| <span id="987">987</span> |
| <span id="988">988</span> |
| <span id="989">989</span> |
| <span id="990">990</span> |
| <span id="991">991</span> |
| <span id="992">992</span> |
| <span id="993">993</span> |
| <span id="994">994</span> |
| <span id="995">995</span> |
| <span id="996">996</span> |
| <span id="997">997</span> |
| <span id="998">998</span> |
| <span id="999">999</span> |
| <span id="1000">1000</span> |
| <span id="1001">1001</span> |
| <span id="1002">1002</span> |
| <span id="1003">1003</span> |
| <span id="1004">1004</span> |
| <span id="1005">1005</span> |
| <span id="1006">1006</span> |
| <span id="1007">1007</span> |
| <span id="1008">1008</span> |
| <span id="1009">1009</span> |
| <span id="1010">1010</span> |
| <span id="1011">1011</span> |
| <span id="1012">1012</span> |
| <span id="1013">1013</span> |
| <span id="1014">1014</span> |
| <span id="1015">1015</span> |
| <span id="1016">1016</span> |
| <span id="1017">1017</span> |
| <span id="1018">1018</span> |
| <span id="1019">1019</span> |
| <span id="1020">1020</span> |
| <span id="1021">1021</span> |
| <span id="1022">1022</span> |
| <span id="1023">1023</span> |
| <span id="1024">1024</span> |
| <span id="1025">1025</span> |
| <span id="1026">1026</span> |
| <span id="1027">1027</span> |
| <span id="1028">1028</span> |
| <span id="1029">1029</span> |
| <span id="1030">1030</span> |
| <span id="1031">1031</span> |
| <span id="1032">1032</span> |
| <span id="1033">1033</span> |
| <span id="1034">1034</span> |
| <span id="1035">1035</span> |
| <span id="1036">1036</span> |
| <span id="1037">1037</span> |
| <span id="1038">1038</span> |
| <span id="1039">1039</span> |
| <span id="1040">1040</span> |
| <span id="1041">1041</span> |
| <span id="1042">1042</span> |
| <span id="1043">1043</span> |
| <span id="1044">1044</span> |
| <span id="1045">1045</span> |
| <span id="1046">1046</span> |
| <span id="1047">1047</span> |
| <span id="1048">1048</span> |
| <span id="1049">1049</span> |
| <span id="1050">1050</span> |
| <span id="1051">1051</span> |
| <span id="1052">1052</span> |
| <span id="1053">1053</span> |
| <span id="1054">1054</span> |
| <span id="1055">1055</span> |
| <span id="1056">1056</span> |
| <span id="1057">1057</span> |
| <span id="1058">1058</span> |
| <span id="1059">1059</span> |
| <span id="1060">1060</span> |
| <span id="1061">1061</span> |
| <span id="1062">1062</span> |
| <span id="1063">1063</span> |
| <span id="1064">1064</span> |
| <span id="1065">1065</span> |
| <span id="1066">1066</span> |
| <span id="1067">1067</span> |
| <span id="1068">1068</span> |
| <span id="1069">1069</span> |
| <span id="1070">1070</span> |
| <span id="1071">1071</span> |
| <span id="1072">1072</span> |
| <span id="1073">1073</span> |
| <span id="1074">1074</span> |
| <span id="1075">1075</span> |
| <span id="1076">1076</span> |
| <span id="1077">1077</span> |
| <span id="1078">1078</span> |
| <span id="1079">1079</span> |
| <span id="1080">1080</span> |
| <span id="1081">1081</span> |
| <span id="1082">1082</span> |
| <span id="1083">1083</span> |
| <span id="1084">1084</span> |
| <span id="1085">1085</span> |
| <span id="1086">1086</span> |
| <span id="1087">1087</span> |
| <span id="1088">1088</span> |
| <span id="1089">1089</span> |
| <span id="1090">1090</span> |
| <span id="1091">1091</span> |
| <span id="1092">1092</span> |
| <span id="1093">1093</span> |
| <span id="1094">1094</span> |
| <span id="1095">1095</span> |
| <span id="1096">1096</span> |
| <span id="1097">1097</span> |
| <span id="1098">1098</span> |
| <span id="1099">1099</span> |
| <span id="1100">1100</span> |
| <span id="1101">1101</span> |
| <span id="1102">1102</span> |
| <span id="1103">1103</span> |
| <span id="1104">1104</span> |
| <span id="1105">1105</span> |
| <span id="1106">1106</span> |
| <span id="1107">1107</span> |
| <span id="1108">1108</span> |
| <span id="1109">1109</span> |
| <span id="1110">1110</span> |
| <span id="1111">1111</span> |
| <span id="1112">1112</span> |
| <span id="1113">1113</span> |
| <span id="1114">1114</span> |
| <span id="1115">1115</span> |
| <span id="1116">1116</span> |
| <span id="1117">1117</span> |
| <span id="1118">1118</span> |
| <span id="1119">1119</span> |
| <span id="1120">1120</span> |
| <span id="1121">1121</span> |
| <span id="1122">1122</span> |
| <span id="1123">1123</span> |
| <span id="1124">1124</span> |
| <span id="1125">1125</span> |
| <span id="1126">1126</span> |
| <span id="1127">1127</span> |
| <span id="1128">1128</span> |
| <span id="1129">1129</span> |
| <span id="1130">1130</span> |
| <span id="1131">1131</span> |
| <span id="1132">1132</span> |
| <span id="1133">1133</span> |
| <span id="1134">1134</span> |
| <span id="1135">1135</span> |
| <span id="1136">1136</span> |
| <span id="1137">1137</span> |
| <span id="1138">1138</span> |
| <span id="1139">1139</span> |
| <span id="1140">1140</span> |
| <span id="1141">1141</span> |
| <span id="1142">1142</span> |
| <span id="1143">1143</span> |
| <span id="1144">1144</span> |
| <span id="1145">1145</span> |
| <span id="1146">1146</span> |
| <span id="1147">1147</span> |
| <span id="1148">1148</span> |
| <span id="1149">1149</span> |
| <span id="1150">1150</span> |
| <span id="1151">1151</span> |
| <span id="1152">1152</span> |
| <span id="1153">1153</span> |
| <span id="1154">1154</span> |
| <span id="1155">1155</span> |
| <span id="1156">1156</span> |
| <span id="1157">1157</span> |
| <span id="1158">1158</span> |
| <span id="1159">1159</span> |
| <span id="1160">1160</span> |
| <span id="1161">1161</span> |
| <span id="1162">1162</span> |
| <span id="1163">1163</span> |
| <span id="1164">1164</span> |
| <span id="1165">1165</span> |
| <span id="1166">1166</span> |
| <span id="1167">1167</span> |
| <span id="1168">1168</span> |
| <span id="1169">1169</span> |
| <span id="1170">1170</span> |
| <span id="1171">1171</span> |
| <span id="1172">1172</span> |
| <span id="1173">1173</span> |
| <span id="1174">1174</span> |
| <span id="1175">1175</span> |
| <span id="1176">1176</span> |
| <span id="1177">1177</span> |
| <span id="1178">1178</span> |
| <span id="1179">1179</span> |
| <span id="1180">1180</span> |
| <span id="1181">1181</span> |
| <span id="1182">1182</span> |
| <span id="1183">1183</span> |
| <span id="1184">1184</span> |
| <span id="1185">1185</span> |
| <span id="1186">1186</span> |
| <span id="1187">1187</span> |
| <span id="1188">1188</span> |
| <span id="1189">1189</span> |
| <span id="1190">1190</span> |
| <span id="1191">1191</span> |
| <span id="1192">1192</span> |
| <span id="1193">1193</span> |
| <span id="1194">1194</span> |
| <span id="1195">1195</span> |
| <span id="1196">1196</span> |
| <span id="1197">1197</span> |
| <span id="1198">1198</span> |
| <span id="1199">1199</span> |
| <span id="1200">1200</span> |
| <span id="1201">1201</span> |
| <span id="1202">1202</span> |
| <span id="1203">1203</span> |
| <span id="1204">1204</span> |
| <span id="1205">1205</span> |
| <span id="1206">1206</span> |
| <span id="1207">1207</span> |
| <span id="1208">1208</span> |
| <span id="1209">1209</span> |
| <span id="1210">1210</span> |
| <span id="1211">1211</span> |
| <span id="1212">1212</span> |
| <span id="1213">1213</span> |
| <span id="1214">1214</span> |
| <span id="1215">1215</span> |
| <span id="1216">1216</span> |
| <span id="1217">1217</span> |
| <span id="1218">1218</span> |
| <span id="1219">1219</span> |
| <span id="1220">1220</span> |
| <span id="1221">1221</span> |
| <span id="1222">1222</span> |
| <span id="1223">1223</span> |
| <span id="1224">1224</span> |
| <span id="1225">1225</span> |
| <span id="1226">1226</span> |
| <span id="1227">1227</span> |
| <span id="1228">1228</span> |
| <span id="1229">1229</span> |
| <span id="1230">1230</span> |
| <span id="1231">1231</span> |
| <span id="1232">1232</span> |
| <span id="1233">1233</span> |
| <span id="1234">1234</span> |
| <span id="1235">1235</span> |
| <span id="1236">1236</span> |
| <span id="1237">1237</span> |
| <span id="1238">1238</span> |
| <span id="1239">1239</span> |
| <span id="1240">1240</span> |
| <span id="1241">1241</span> |
| <span id="1242">1242</span> |
| <span id="1243">1243</span> |
| <span id="1244">1244</span> |
| <span id="1245">1245</span> |
| <span id="1246">1246</span> |
| <span id="1247">1247</span> |
| <span id="1248">1248</span> |
| <span id="1249">1249</span> |
| <span id="1250">1250</span> |
| <span id="1251">1251</span> |
| <span id="1252">1252</span> |
| <span id="1253">1253</span> |
| <span id="1254">1254</span> |
| <span id="1255">1255</span> |
| <span id="1256">1256</span> |
| <span id="1257">1257</span> |
| <span id="1258">1258</span> |
| <span id="1259">1259</span> |
| <span id="1260">1260</span> |
| <span id="1261">1261</span> |
| <span id="1262">1262</span> |
| <span id="1263">1263</span> |
| <span id="1264">1264</span> |
| <span id="1265">1265</span> |
| <span id="1266">1266</span> |
| <span id="1267">1267</span> |
| <span id="1268">1268</span> |
| <span id="1269">1269</span> |
| <span id="1270">1270</span> |
| <span id="1271">1271</span> |
| <span id="1272">1272</span> |
| <span id="1273">1273</span> |
| <span id="1274">1274</span> |
| <span id="1275">1275</span> |
| <span id="1276">1276</span> |
| <span id="1277">1277</span> |
| <span id="1278">1278</span> |
| <span id="1279">1279</span> |
| <span id="1280">1280</span> |
| <span id="1281">1281</span> |
| <span id="1282">1282</span> |
| <span id="1283">1283</span> |
| <span id="1284">1284</span> |
| <span id="1285">1285</span> |
| <span id="1286">1286</span> |
| <span id="1287">1287</span> |
| <span id="1288">1288</span> |
| <span id="1289">1289</span> |
| <span id="1290">1290</span> |
| <span id="1291">1291</span> |
| <span id="1292">1292</span> |
| <span id="1293">1293</span> |
| <span id="1294">1294</span> |
| <span id="1295">1295</span> |
| <span id="1296">1296</span> |
| <span id="1297">1297</span> |
| <span id="1298">1298</span> |
| <span id="1299">1299</span> |
| <span id="1300">1300</span> |
| <span id="1301">1301</span> |
| <span id="1302">1302</span> |
| <span id="1303">1303</span> |
| <span id="1304">1304</span> |
| <span id="1305">1305</span> |
| <span id="1306">1306</span> |
| <span id="1307">1307</span> |
| <span id="1308">1308</span> |
| <span id="1309">1309</span> |
| <span id="1310">1310</span> |
| <span id="1311">1311</span> |
| <span id="1312">1312</span> |
| <span id="1313">1313</span> |
| <span id="1314">1314</span> |
| <span id="1315">1315</span> |
| <span id="1316">1316</span> |
| <span id="1317">1317</span> |
| <span id="1318">1318</span> |
| <span id="1319">1319</span> |
| <span id="1320">1320</span> |
| <span id="1321">1321</span> |
| <span id="1322">1322</span> |
| <span id="1323">1323</span> |
| <span id="1324">1324</span> |
| <span id="1325">1325</span> |
| <span id="1326">1326</span> |
| <span id="1327">1327</span> |
| <span id="1328">1328</span> |
| <span id="1329">1329</span> |
| <span id="1330">1330</span> |
| <span id="1331">1331</span> |
| <span id="1332">1332</span> |
| <span id="1333">1333</span> |
| <span id="1334">1334</span> |
| <span id="1335">1335</span> |
| <span id="1336">1336</span> |
| <span id="1337">1337</span> |
| <span id="1338">1338</span> |
| <span id="1339">1339</span> |
| <span id="1340">1340</span> |
| <span id="1341">1341</span> |
| <span id="1342">1342</span> |
| <span id="1343">1343</span> |
| <span id="1344">1344</span> |
| <span id="1345">1345</span> |
| <span id="1346">1346</span> |
| <span id="1347">1347</span> |
| <span id="1348">1348</span> |
| <span id="1349">1349</span> |
| <span id="1350">1350</span> |
| <span id="1351">1351</span> |
| <span id="1352">1352</span> |
| <span id="1353">1353</span> |
| <span id="1354">1354</span> |
| <span id="1355">1355</span> |
| <span id="1356">1356</span> |
| <span id="1357">1357</span> |
| <span id="1358">1358</span> |
| <span id="1359">1359</span> |
| <span id="1360">1360</span> |
| <span id="1361">1361</span> |
| <span id="1362">1362</span> |
| <span id="1363">1363</span> |
| <span id="1364">1364</span> |
| <span id="1365">1365</span> |
| <span id="1366">1366</span> |
| <span id="1367">1367</span> |
| <span id="1368">1368</span> |
| <span id="1369">1369</span> |
| <span id="1370">1370</span> |
| <span id="1371">1371</span> |
| <span id="1372">1372</span> |
| <span id="1373">1373</span> |
| <span id="1374">1374</span> |
| <span id="1375">1375</span> |
| <span id="1376">1376</span> |
| <span id="1377">1377</span> |
| <span id="1378">1378</span> |
| <span id="1379">1379</span> |
| <span id="1380">1380</span> |
| <span id="1381">1381</span> |
| <span id="1382">1382</span> |
| <span id="1383">1383</span> |
| <span id="1384">1384</span> |
| <span id="1385">1385</span> |
| <span id="1386">1386</span> |
| <span id="1387">1387</span> |
| <span id="1388">1388</span> |
| <span id="1389">1389</span> |
| <span id="1390">1390</span> |
| <span id="1391">1391</span> |
| <span id="1392">1392</span> |
| <span id="1393">1393</span> |
| <span id="1394">1394</span> |
| <span id="1395">1395</span> |
| <span id="1396">1396</span> |
| <span id="1397">1397</span> |
| <span id="1398">1398</span> |
| <span id="1399">1399</span> |
| <span id="1400">1400</span> |
| <span id="1401">1401</span> |
| <span id="1402">1402</span> |
| <span id="1403">1403</span> |
| <span id="1404">1404</span> |
| <span id="1405">1405</span> |
| <span id="1406">1406</span> |
| <span id="1407">1407</span> |
| <span id="1408">1408</span> |
| <span id="1409">1409</span> |
| <span id="1410">1410</span> |
| <span id="1411">1411</span> |
| <span id="1412">1412</span> |
| <span id="1413">1413</span> |
| <span id="1414">1414</span> |
| <span id="1415">1415</span> |
| <span id="1416">1416</span> |
| <span id="1417">1417</span> |
| <span id="1418">1418</span> |
| <span id="1419">1419</span> |
| <span id="1420">1420</span> |
| <span id="1421">1421</span> |
| <span id="1422">1422</span> |
| <span id="1423">1423</span> |
| <span id="1424">1424</span> |
| <span id="1425">1425</span> |
| <span id="1426">1426</span> |
| <span id="1427">1427</span> |
| <span id="1428">1428</span> |
| <span id="1429">1429</span> |
| <span id="1430">1430</span> |
| <span id="1431">1431</span> |
| <span id="1432">1432</span> |
| <span id="1433">1433</span> |
| <span id="1434">1434</span> |
| <span id="1435">1435</span> |
| <span id="1436">1436</span> |
| <span id="1437">1437</span> |
| <span id="1438">1438</span> |
| <span id="1439">1439</span> |
| <span id="1440">1440</span> |
| <span id="1441">1441</span> |
| <span id="1442">1442</span> |
| <span id="1443">1443</span> |
| <span id="1444">1444</span> |
| <span id="1445">1445</span> |
| <span id="1446">1446</span> |
| <span id="1447">1447</span> |
| <span id="1448">1448</span> |
| <span id="1449">1449</span> |
| <span id="1450">1450</span> |
| <span id="1451">1451</span> |
| <span id="1452">1452</span> |
| <span id="1453">1453</span> |
| <span id="1454">1454</span> |
| <span id="1455">1455</span> |
| <span id="1456">1456</span> |
| <span id="1457">1457</span> |
| <span id="1458">1458</span> |
| <span id="1459">1459</span> |
| <span id="1460">1460</span> |
| <span id="1461">1461</span> |
| <span id="1462">1462</span> |
| <span id="1463">1463</span> |
| <span id="1464">1464</span> |
| <span id="1465">1465</span> |
| <span id="1466">1466</span> |
| <span id="1467">1467</span> |
| <span id="1468">1468</span> |
| <span id="1469">1469</span> |
| <span id="1470">1470</span> |
| <span id="1471">1471</span> |
| <span id="1472">1472</span> |
| <span id="1473">1473</span> |
| <span id="1474">1474</span> |
| <span id="1475">1475</span> |
| <span id="1476">1476</span> |
| <span id="1477">1477</span> |
| <span id="1478">1478</span> |
| <span id="1479">1479</span> |
| <span id="1480">1480</span> |
| <span id="1481">1481</span> |
| <span id="1482">1482</span> |
| <span id="1483">1483</span> |
| <span id="1484">1484</span> |
| <span id="1485">1485</span> |
| <span id="1486">1486</span> |
| <span id="1487">1487</span> |
| <span id="1488">1488</span> |
| <span id="1489">1489</span> |
| <span id="1490">1490</span> |
| <span id="1491">1491</span> |
| <span id="1492">1492</span> |
| <span id="1493">1493</span> |
| <span id="1494">1494</span> |
| <span id="1495">1495</span> |
| <span id="1496">1496</span> |
| <span id="1497">1497</span> |
| <span id="1498">1498</span> |
| <span id="1499">1499</span> |
| <span id="1500">1500</span> |
| <span id="1501">1501</span> |
| <span id="1502">1502</span> |
| <span id="1503">1503</span> |
| <span id="1504">1504</span> |
| <span id="1505">1505</span> |
| <span id="1506">1506</span> |
| <span id="1507">1507</span> |
| <span id="1508">1508</span> |
| <span id="1509">1509</span> |
| <span id="1510">1510</span> |
| <span id="1511">1511</span> |
| <span id="1512">1512</span> |
| <span id="1513">1513</span> |
| <span id="1514">1514</span> |
| <span id="1515">1515</span> |
| <span id="1516">1516</span> |
| <span id="1517">1517</span> |
| <span id="1518">1518</span> |
| <span id="1519">1519</span> |
| <span id="1520">1520</span> |
| <span id="1521">1521</span> |
| <span id="1522">1522</span> |
| <span id="1523">1523</span> |
| <span id="1524">1524</span> |
| <span id="1525">1525</span> |
| <span id="1526">1526</span> |
| <span id="1527">1527</span> |
| <span id="1528">1528</span> |
| <span id="1529">1529</span> |
| <span id="1530">1530</span> |
| <span id="1531">1531</span> |
| <span id="1532">1532</span> |
| <span id="1533">1533</span> |
| <span id="1534">1534</span> |
| <span id="1535">1535</span> |
| <span id="1536">1536</span> |
| <span id="1537">1537</span> |
| <span id="1538">1538</span> |
| <span id="1539">1539</span> |
| <span id="1540">1540</span> |
| <span id="1541">1541</span> |
| <span id="1542">1542</span> |
| <span id="1543">1543</span> |
| <span id="1544">1544</span> |
| <span id="1545">1545</span> |
| <span id="1546">1546</span> |
| <span id="1547">1547</span> |
| <span id="1548">1548</span> |
| <span id="1549">1549</span> |
| <span id="1550">1550</span> |
| <span id="1551">1551</span> |
| <span id="1552">1552</span> |
| <span id="1553">1553</span> |
| <span id="1554">1554</span> |
| <span id="1555">1555</span> |
| <span id="1556">1556</span> |
| <span id="1557">1557</span> |
| <span id="1558">1558</span> |
| <span id="1559">1559</span> |
| <span id="1560">1560</span> |
| <span id="1561">1561</span> |
| <span id="1562">1562</span> |
| <span id="1563">1563</span> |
| <span id="1564">1564</span> |
| <span id="1565">1565</span> |
| <span id="1566">1566</span> |
| <span id="1567">1567</span> |
| <span id="1568">1568</span> |
| <span id="1569">1569</span> |
| <span id="1570">1570</span> |
| <span id="1571">1571</span> |
| <span id="1572">1572</span> |
| <span id="1573">1573</span> |
| <span id="1574">1574</span> |
| <span id="1575">1575</span> |
| <span id="1576">1576</span> |
| <span id="1577">1577</span> |
| <span id="1578">1578</span> |
| <span id="1579">1579</span> |
| <span id="1580">1580</span> |
| <span id="1581">1581</span> |
| <span id="1582">1582</span> |
| <span id="1583">1583</span> |
| <span id="1584">1584</span> |
| <span id="1585">1585</span> |
| <span id="1586">1586</span> |
| <span id="1587">1587</span> |
| <span id="1588">1588</span> |
| <span id="1589">1589</span> |
| <span id="1590">1590</span> |
| <span id="1591">1591</span> |
| <span id="1592">1592</span> |
| <span id="1593">1593</span> |
| <span id="1594">1594</span> |
| <span id="1595">1595</span> |
| <span id="1596">1596</span> |
| <span id="1597">1597</span> |
| <span id="1598">1598</span> |
| <span id="1599">1599</span> |
| <span id="1600">1600</span> |
| <span id="1601">1601</span> |
| <span id="1602">1602</span> |
| <span id="1603">1603</span> |
| <span id="1604">1604</span> |
| <span id="1605">1605</span> |
| <span id="1606">1606</span> |
| <span id="1607">1607</span> |
| <span id="1608">1608</span> |
| <span id="1609">1609</span> |
| <span id="1610">1610</span> |
| <span id="1611">1611</span> |
| <span id="1612">1612</span> |
| <span id="1613">1613</span> |
| <span id="1614">1614</span> |
| <span id="1615">1615</span> |
| <span id="1616">1616</span> |
| <span id="1617">1617</span> |
| <span id="1618">1618</span> |
| <span id="1619">1619</span> |
| <span id="1620">1620</span> |
| <span id="1621">1621</span> |
| <span id="1622">1622</span> |
| <span id="1623">1623</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! Spans represent periods of time in which a program was executing in a |
| //! particular context. |
| //! |
| //! A span consists of [fields], user-defined key-value pairs of arbitrary data |
| //! that describe the context the span represents, and a set of fixed attributes |
| //! that describe all `tracing` spans and events. Attributes describing spans |
| //! include: |
| //! |
| //! - An [`Id`] assigned by the subscriber that uniquely identifies it in relation |
| //! to other spans. |
| //! - The span's [parent] in the trace tree. |
| //! - [Metadata] that describes static characteristics of all spans |
| //! originating from that callsite, such as its name, source code location, |
| //! [verbosity level], and the names of its fields. |
| //! |
| //! # Creating Spans |
| //! |
| //! Spans are created using the [`span!`] macro. This macro is invoked with the |
| //! following arguments, in order: |
| //! |
| //! - The [`target`] and/or [`parent`][parent] attributes, if the user wishes to |
| //! override their default values. |
| //! - The span's [verbosity level] |
| //! - A string literal providing the span's name. |
| //! - Finally, between zero and 32 arbitrary key/value fields. |
| //! |
| //! [`target`]: super::Metadata::target |
| //! |
| //! For example: |
| //! ```rust |
| //! use tracing::{span, Level}; |
| //! |
| //! /// Construct a new span at the `INFO` level named "my_span", with a single |
| //! /// field named answer , with the value `42`. |
| //! let my_span = span!(Level::INFO, "my_span", answer = 42); |
| //! ``` |
| //! |
| //! The documentation for the [`span!`] macro provides additional examples of |
| //! the various options that exist when creating spans. |
| //! |
| //! The [`trace_span!`], [`debug_span!`], [`info_span!`], [`warn_span!`], and |
| //! [`error_span!`] exist as shorthand for constructing spans at various |
| //! verbosity levels. |
| //! |
| //! ## Recording Span Creation |
| //! |
| //! The [`Attributes`] type contains data associated with a span, and is |
| //! provided to the [`Subscriber`] when a new span is created. It contains |
| //! the span's metadata, the ID of [the span's parent][parent] if one was |
| //! explicitly set, and any fields whose values were recorded when the span was |
| //! constructed. The subscriber, which is responsible for recording `tracing` |
| //! data, can then store or record these values. |
| //! |
| //! # The Span Lifecycle |
| //! |
| //! ## Entering a Span |
| //! |
| //! A thread of execution is said to _enter_ a span when it begins executing, |
| //! and _exit_ the span when it switches to another context. Spans may be |
| //! entered through the [`enter`], [`entered`], and [`in_scope`] methods. |
| //! |
| //! The [`enter`] method enters a span, returning a [guard] that exits the span |
| //! when dropped |
| //! ``` |
| //! # use tracing::{span, Level}; |
| //! let my_var: u64 = 5; |
| //! let my_span = span!(Level::TRACE, "my_span", my_var); |
| //! |
| //! // `my_span` exists but has not been entered. |
| //! |
| //! // Enter `my_span`... |
| //! let _enter = my_span.enter(); |
| //! |
| //! // Perform some work inside of the context of `my_span`... |
| //! // Dropping the `_enter` guard will exit the span. |
| //!``` |
| //! |
| //! <div class="example-wrap" style="display:inline-block"><pre class="compile_fail" style="white-space:normal;font:inherit;"> |
| //! <strong>Warning</strong>: In asynchronous code that uses async/await syntax, |
| //! <code>Span::enter</code> may produce incorrect traces if the returned drop |
| //! guard is held across an await point. See |
| //! <a href="struct.Span.html#in-asynchronous-code">the method documentation</a> |
| //! for details. |
| //! </pre></div> |
| //! |
| //! The [`entered`] method is analogous to [`enter`], but moves the span into |
| //! the returned guard, rather than borrowing it. This allows creating and |
| //! entering a span in a single expression: |
| //! |
| //! ``` |
| //! # use tracing::{span, Level}; |
| //! // Create a span and enter it, returning a guard: |
| //! let span = span!(Level::INFO, "my_span").entered(); |
| //! |
| //! // We are now inside the span! Like `enter()`, the guard returned by |
| //! // `entered()` will exit the span when it is dropped... |
| //! |
| //! // ...but, it can also be exited explicitly, returning the `Span` |
| //! // struct: |
| //! let span = span.exit(); |
| //! ``` |
| //! |
| //! Finally, [`in_scope`] takes a closure or function pointer and executes it |
| //! inside the span: |
| //! |
| //! ``` |
| //! # use tracing::{span, Level}; |
| //! let my_var: u64 = 5; |
| //! let my_span = span!(Level::TRACE, "my_span", my_var = &my_var); |
| //! |
| //! my_span.in_scope(|| { |
| //! // perform some work in the context of `my_span`... |
| //! }); |
| //! |
| //! // Perform some work outside of the context of `my_span`... |
| //! |
| //! my_span.in_scope(|| { |
| //! // Perform some more work in the context of `my_span`. |
| //! }); |
| //! ``` |
| //! |
| //! <pre class="ignore" style="white-space:normal;font:inherit;"> |
| //! <strong>Note</strong>: Since entering a span takes <code>&self</code>, and |
| //! <code>Span</code>s are <code>Clone</code>, <code>Send</code>, and |
| //! <code>Sync</code>, it is entirely valid for multiple threads to enter the |
| //! same span concurrently. |
| //! </pre> |
| //! |
| //! ## Span Relationships |
| //! |
| //! Spans form a tree structure — unless it is a root span, all spans have a |
| //! _parent_, and may have one or more _children_. When a new span is created, |
| //! the current span becomes the new span's parent. The total execution time of |
| //! a span consists of the time spent in that span and in the entire subtree |
| //! represented by its children. Thus, a parent span always lasts for at least |
| //! as long as the longest-executing span in its subtree. |
| //! |
| //! ``` |
| //! # use tracing::{Level, span}; |
| //! // this span is considered the "root" of a new trace tree: |
| //! span!(Level::INFO, "root").in_scope(|| { |
| //! // since we are now inside "root", this span is considered a child |
| //! // of "root": |
| //! span!(Level::DEBUG, "outer_child").in_scope(|| { |
| //! // this span is a child of "outer_child", which is in turn a |
| //! // child of "root": |
| //! span!(Level::TRACE, "inner_child").in_scope(|| { |
| //! // and so on... |
| //! }); |
| //! }); |
| //! // another span created here would also be a child of "root". |
| //! }); |
| //!``` |
| //! |
| //! In addition, the parent of a span may be explicitly specified in |
| //! the `span!` macro. For example: |
| //! |
| //! ```rust |
| //! # use tracing::{Level, span}; |
| //! // Create, but do not enter, a span called "foo". |
| //! let foo = span!(Level::INFO, "foo"); |
| //! |
| //! // Create and enter a span called "bar". |
| //! let bar = span!(Level::INFO, "bar"); |
| //! let _enter = bar.enter(); |
| //! |
| //! // Although we have currently entered "bar", "baz"'s parent span |
| //! // will be "foo". |
| //! let baz = span!(parent: &foo, Level::INFO, "baz"); |
| //! ``` |
| //! |
| //! A child span should typically be considered _part_ of its parent. For |
| //! example, if a subscriber is recording the length of time spent in various |
| //! spans, it should generally include the time spent in a span's children as |
| //! part of that span's duration. |
| //! |
| //! In addition to having zero or one parent, a span may also _follow from_ any |
| //! number of other spans. This indicates a causal relationship between the span |
| //! and the spans that it follows from, but a follower is *not* typically |
| //! considered part of the duration of the span it follows. Unlike the parent, a |
| //! span may record that it follows from another span after it is created, using |
| //! the [`follows_from`] method. |
| //! |
| //! As an example, consider a listener task in a server. As the listener accepts |
| //! incoming connections, it spawns new tasks that handle those connections. We |
| //! might want to have a span representing the listener, and instrument each |
| //! spawned handler task with its own span. We would want our instrumentation to |
| //! record that the handler tasks were spawned as a result of the listener task. |
| //! However, we might not consider the handler tasks to be _part_ of the time |
| //! spent in the listener task, so we would not consider those spans children of |
| //! the listener span. Instead, we would record that the handler tasks follow |
| //! from the listener, recording the causal relationship but treating the spans |
| //! as separate durations. |
| //! |
| //! ## Closing Spans |
| //! |
| //! Execution may enter and exit a span multiple times before that span is |
| //! _closed_. Consider, for example, a future which has an associated |
| //! span and enters that span every time it is polled: |
| //! ```rust |
| //! # use std::future::Future; |
| //! # use std::task::{Context, Poll}; |
| //! # use std::pin::Pin; |
| //! struct MyFuture { |
| //! // data |
| //! span: tracing::Span, |
| //! } |
| //! |
| //! impl Future for MyFuture { |
| //! type Output = (); |
| //! |
| //! fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Self::Output> { |
| //! let _enter = self.span.enter(); |
| //! // Do actual future work... |
| //! # Poll::Ready(()) |
| //! } |
| //! } |
| //! ``` |
| //! |
| //! If this future was spawned on an executor, it might yield one or more times |
| //! before `poll` returns [`Poll::Ready`]. If the future were to yield, then |
| //! the executor would move on to poll the next future, which may _also_ enter |
| //! an associated span or series of spans. Therefore, it is valid for a span to |
| //! be entered repeatedly before it completes. Only the time when that span or |
| //! one of its children was the current span is considered to be time spent in |
| //! that span. A span which is not executing and has not yet been closed is said |
| //! to be _idle_. |
| //! |
| //! Because spans may be entered and exited multiple times before they close, |
| //! [`Subscriber`]s have separate trait methods which are called to notify them |
| //! of span exits and when span handles are dropped. When execution exits a |
| //! span, [`exit`] will always be called with that span's ID to notify the |
| //! subscriber that the span has been exited. When span handles are dropped, the |
| //! [`drop_span`] method is called with that span's ID. The subscriber may use |
| //! this to determine whether or not the span will be entered again. |
| //! |
| //! If there is only a single handle with the capacity to exit a span, dropping |
| //! that handle "closes" the span, since the capacity to enter it no longer |
| //! exists. For example: |
| //! ``` |
| //! # use tracing::{Level, span}; |
| //! { |
| //! span!(Level::TRACE, "my_span").in_scope(|| { |
| //! // perform some work in the context of `my_span`... |
| //! }); // --> Subscriber::exit(my_span) |
| //! |
| //! // The handle to `my_span` only lives inside of this block; when it is |
| //! // dropped, the subscriber will be informed via `drop_span`. |
| //! |
| //! } // --> Subscriber::drop_span(my_span) |
| //! ``` |
| //! |
| //! However, if multiple handles exist, the span can still be re-entered even if |
| //! one or more is dropped. For determining when _all_ handles to a span have |
| //! been dropped, `Subscriber`s have a [`clone_span`] method, which is called |
| //! every time a span handle is cloned. Combined with `drop_span`, this may be |
| //! used to track the number of handles to a given span — if `drop_span` has |
| //! been called one more time than the number of calls to `clone_span` for a |
| //! given ID, then no more handles to the span with that ID exist. The |
| //! subscriber may then treat it as closed. |
| //! |
| //! # When to use spans |
| //! |
| //! As a rule of thumb, spans should be used to represent discrete units of work |
| //! (e.g., a given request's lifetime in a server) or periods of time spent in a |
| //! given context (e.g., time spent interacting with an instance of an external |
| //! system, such as a database). |
| //! |
| //! Which scopes in a program correspond to new spans depend somewhat on user |
| //! intent. For example, consider the case of a loop in a program. Should we |
| //! construct one span and perform the entire loop inside of that span, like: |
| //! |
| //! ```rust |
| //! # use tracing::{Level, span}; |
| //! # let n = 1; |
| //! let span = span!(Level::TRACE, "my_loop"); |
| //! let _enter = span.enter(); |
| //! for i in 0..n { |
| //! # let _ = i; |
| //! // ... |
| //! } |
| //! ``` |
| //! Or, should we create a new span for each iteration of the loop, as in: |
| //! ```rust |
| //! # use tracing::{Level, span}; |
| //! # let n = 1u64; |
| //! for i in 0..n { |
| //! let span = span!(Level::TRACE, "my_loop", iteration = i); |
| //! let _enter = span.enter(); |
| //! // ... |
| //! } |
| //! ``` |
| //! |
| //! Depending on the circumstances, we might want to do either, or both. For |
| //! example, if we want to know how long was spent in the loop overall, we would |
| //! create a single span around the entire loop; whereas if we wanted to know how |
| //! much time was spent in each individual iteration, we would enter a new span |
| //! on every iteration. |
| //! |
| //! [fields]: super::field |
| //! [Metadata]: super::Metadata |
| //! [verbosity level]: super::Level |
| //! [`Poll::Ready`]: std::task::Poll::Ready |
| //! [`span!`]: super::span! |
| //! [`trace_span!`]: super::trace_span! |
| //! [`debug_span!`]: super::debug_span! |
| //! [`info_span!`]: super::info_span! |
| //! [`warn_span!`]: super::warn_span! |
| //! [`error_span!`]: super::error_span! |
| //! [`clone_span`]: super::subscriber::Subscriber::clone_span() |
| //! [`drop_span`]: super::subscriber::Subscriber::drop_span() |
| //! [`exit`]: super::subscriber::Subscriber::exit |
| //! [`Subscriber`]: super::subscriber::Subscriber |
| //! [`enter`]: Span::enter() |
| //! [`entered`]: Span::entered() |
| //! [`in_scope`]: Span::in_scope() |
| //! [`follows_from`]: Span::follows_from() |
| //! [guard]: Entered |
| //! [parent]: #span-relationships |
| </span><span class="kw">pub use </span>tracing_core::span::{Attributes, Id, Record}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::stdlib::{ |
| cmp, fmt, |
| hash::{Hash, Hasher}, |
| marker::PhantomData, |
| mem, |
| ops::Deref, |
| }; |
| <span class="kw">use crate</span>::{ |
| dispatcher::{<span class="self">self</span>, Dispatch}, |
| field, Metadata, |
| }; |
| |
| <span class="doccomment">/// Trait implemented by types which have a span `Id`. |
| </span><span class="kw">pub trait </span>AsId: <span class="kw">crate</span>::sealed::Sealed { |
| <span class="doccomment">/// Returns the `Id` of the span that `self` corresponds to, or `None` if |
| /// this corresponds to a disabled span. |
| </span><span class="kw">fn </span>as_id(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Id>; |
| } |
| |
| <span class="doccomment">/// A handle representing a span, with the capability to enter the span if it |
| /// exists. |
| /// |
| /// If the span was rejected by the current `Subscriber`'s filter, entering the |
| /// span will silently do nothing. Thus, the handle can be used in the same |
| /// manner regardless of whether or not the trace is currently being collected. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>Span { |
| <span class="doccomment">/// A handle used to enter the span when it is not executing. |
| /// |
| /// If this is `None`, then the span has either closed or was never enabled. |
| </span>inner: <span class="prelude-ty">Option</span><Inner>, |
| <span class="doccomment">/// Metadata describing the span. |
| /// |
| /// This might be `Some` even if `inner` is `None`, in the case that the |
| /// span is disabled but the metadata is needed for `log` support. |
| </span>meta: <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>>, |
| } |
| |
| <span class="doccomment">/// A handle representing the capacity to enter a span which is known to exist. |
| /// |
| /// Unlike `Span`, this type is only constructed for spans which _have_ been |
| /// enabled by the current filter. This type is primarily used for implementing |
| /// span handles; users should typically not need to interact with it directly. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Inner { |
| <span class="doccomment">/// The span's ID, as provided by `subscriber`. |
| </span>id: Id, |
| |
| <span class="doccomment">/// The subscriber that will receive events relating to this span. |
| /// |
| /// This should be the same subscriber that provided this span with its |
| /// `id`. |
| </span>subscriber: Dispatch, |
| } |
| |
| <span class="doccomment">/// A guard representing a span which has been entered and is currently |
| /// executing. |
| /// |
| /// When the guard is dropped, the span will be exited. |
| /// |
| /// This is returned by the [`Span::enter`] function. |
| /// |
| /// [`Span::enter`]: super::Span::enter |
| </span><span class="attribute">#[derive(Debug)] |
| #[must_use = <span class="string">"once a span has been entered, it should be exited"</span>] |
| </span><span class="kw">pub struct </span>Entered<<span class="lifetime">'a</span>> { |
| span: <span class="kw-2">&</span><span class="lifetime">'a </span>Span, |
| } |
| |
| <span class="doccomment">/// An owned version of [`Entered`], a guard representing a span which has been |
| /// entered and is currently executing. |
| /// |
| /// When the guard is dropped, the span will be exited. |
| /// |
| /// This is returned by the [`Span::entered`] function. |
| /// |
| /// [`Span::entered`]: super::Span::entered() |
| </span><span class="attribute">#[derive(Debug)] |
| #[must_use = <span class="string">"once a span has been entered, it should be exited"</span>] |
| </span><span class="kw">pub struct </span>EnteredSpan { |
| span: Span, |
| |
| <span class="doccomment">/// ```compile_fail |
| /// use tracing::span::*; |
| /// trait AssertSend: Send {} |
| /// |
| /// impl AssertSend for EnteredSpan {} |
| /// ``` |
| </span>_not_send: PhantomNotSend, |
| } |
| |
| <span class="doccomment">/// `log` target for all span lifecycle (creation/enter/exit/close) records. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"log"</span>)] |
| </span><span class="kw">const </span>LIFECYCLE_LOG_TARGET: <span class="kw-2">&</span>str = <span class="string">"tracing::span"</span>; |
| <span class="doccomment">/// `log` target for span activity (enter/exit) records. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"log"</span>)] |
| </span><span class="kw">const </span>ACTIVITY_LOG_TARGET: <span class="kw-2">&</span>str = <span class="string">"tracing::span::active"</span>; |
| |
| <span class="comment">// ===== impl Span ===== |
| |
| </span><span class="kw">impl </span>Span { |
| <span class="doccomment">/// Constructs a new `Span` with the given [metadata] and set of |
| /// [field values]. |
| /// |
| /// The new span will be constructed by the currently-active [`Subscriber`], |
| /// with the current span as its parent (if one exists). |
| /// |
| /// After the span is constructed, [field values] and/or [`follows_from`] |
| /// annotations may be added to it. |
| /// |
| /// [metadata]: super::Metadata |
| /// [`Subscriber`]: super::subscriber::Subscriber |
| /// [field values]: super::field::ValueSet |
| /// [`follows_from`]: super::Span::follows_from |
| </span><span class="kw">pub fn </span>new(meta: <span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>, values: <span class="kw-2">&</span>field::ValueSet<<span class="lifetime">'_</span>>) -> Span { |
| dispatcher::get_default(|dispatch| <span class="self">Self</span>::new_with(meta, values, dispatch)) |
| } |
| |
| <span class="attribute">#[inline] |
| #[doc(hidden)] |
| </span><span class="kw">pub fn </span>new_with( |
| meta: <span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>, |
| values: <span class="kw-2">&</span>field::ValueSet<<span class="lifetime">'_</span>>, |
| dispatch: <span class="kw-2">&</span>Dispatch, |
| ) -> Span { |
| <span class="kw">let </span>new_span = Attributes::new(meta, values); |
| <span class="self">Self</span>::make_with(meta, new_span, dispatch) |
| } |
| |
| <span class="doccomment">/// Constructs a new `Span` as the root of its own trace tree, with the |
| /// given [metadata] and set of [field values]. |
| /// |
| /// After the span is constructed, [field values] and/or [`follows_from`] |
| /// annotations may be added to it. |
| /// |
| /// [metadata]: super::Metadata |
| /// [field values]: super::field::ValueSet |
| /// [`follows_from`]: super::Span::follows_from |
| </span><span class="kw">pub fn </span>new_root(meta: <span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>, values: <span class="kw-2">&</span>field::ValueSet<<span class="lifetime">'_</span>>) -> Span { |
| dispatcher::get_default(|dispatch| <span class="self">Self</span>::new_root_with(meta, values, dispatch)) |
| } |
| |
| <span class="attribute">#[inline] |
| #[doc(hidden)] |
| </span><span class="kw">pub fn </span>new_root_with( |
| meta: <span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>, |
| values: <span class="kw-2">&</span>field::ValueSet<<span class="lifetime">'_</span>>, |
| dispatch: <span class="kw-2">&</span>Dispatch, |
| ) -> Span { |
| <span class="kw">let </span>new_span = Attributes::new_root(meta, values); |
| <span class="self">Self</span>::make_with(meta, new_span, dispatch) |
| } |
| |
| <span class="doccomment">/// Constructs a new `Span` as child of the given parent span, with the |
| /// given [metadata] and set of [field values]. |
| /// |
| /// After the span is constructed, [field values] and/or [`follows_from`] |
| /// annotations may be added to it. |
| /// |
| /// [metadata]: super::Metadata |
| /// [field values]: super::field::ValueSet |
| /// [`follows_from`]: super::Span::follows_from |
| </span><span class="kw">pub fn </span>child_of( |
| parent: <span class="kw">impl </span>Into<<span class="prelude-ty">Option</span><Id>>, |
| meta: <span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>, |
| values: <span class="kw-2">&</span>field::ValueSet<<span class="lifetime">'_</span>>, |
| ) -> Span { |
| <span class="kw">let </span><span class="kw-2">mut </span>parent = parent.into(); |
| dispatcher::get_default(<span class="kw">move </span>|dispatch| { |
| <span class="self">Self</span>::child_of_with(Option::take(<span class="kw-2">&mut </span>parent), meta, values, dispatch) |
| }) |
| } |
| |
| <span class="attribute">#[inline] |
| #[doc(hidden)] |
| </span><span class="kw">pub fn </span>child_of_with( |
| parent: <span class="kw">impl </span>Into<<span class="prelude-ty">Option</span><Id>>, |
| meta: <span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>, |
| values: <span class="kw-2">&</span>field::ValueSet<<span class="lifetime">'_</span>>, |
| dispatch: <span class="kw-2">&</span>Dispatch, |
| ) -> Span { |
| <span class="kw">let </span>new_span = <span class="kw">match </span>parent.into() { |
| <span class="prelude-val">Some</span>(parent) => Attributes::child_of(parent, meta, values), |
| <span class="prelude-val">None </span>=> Attributes::new_root(meta, values), |
| }; |
| <span class="self">Self</span>::make_with(meta, new_span, dispatch) |
| } |
| |
| <span class="doccomment">/// Constructs a new disabled span with the given `Metadata`. |
| /// |
| /// This should be used when a span is constructed from a known callsite, |
| /// but the subscriber indicates that it is disabled. |
| /// |
| /// Entering, exiting, and recording values on this span will not notify the |
| /// `Subscriber` but _may_ record log messages if the `log` feature flag is |
| /// enabled. |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub fn </span>new_disabled(meta: <span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>) -> Span { |
| <span class="self">Self </span>{ |
| inner: <span class="prelude-val">None</span>, |
| meta: <span class="prelude-val">Some</span>(meta), |
| } |
| } |
| |
| <span class="doccomment">/// Constructs a new span that is *completely disabled*. |
| /// |
| /// This can be used rather than `Option<Span>` to represent cases where a |
| /// span is not present. |
| /// |
| /// Entering, exiting, and recording values on this span will do nothing. |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub const fn </span>none() -> Span { |
| <span class="self">Self </span>{ |
| inner: <span class="prelude-val">None</span>, |
| meta: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns a handle to the span [considered by the `Subscriber`] to be the |
| /// current span. |
| /// |
| /// If the subscriber indicates that it does not track the current span, or |
| /// that the thread from which this function is called is not currently |
| /// inside a span, the returned span will be disabled. |
| /// |
| /// [considered by the `Subscriber`]: |
| /// super::subscriber::Subscriber::current_span |
| </span><span class="kw">pub fn </span>current() -> Span { |
| dispatcher::get_default(|dispatch| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((id, meta)) = dispatch.current_span().into_inner() { |
| <span class="kw">let </span>id = dispatch.clone_span(<span class="kw-2">&</span>id); |
| <span class="self">Self </span>{ |
| inner: <span class="prelude-val">Some</span>(Inner::new(id, dispatch)), |
| meta: <span class="prelude-val">Some</span>(meta), |
| } |
| } <span class="kw">else </span>{ |
| <span class="self">Self</span>::none() |
| } |
| }) |
| } |
| |
| <span class="kw">fn </span>make_with( |
| meta: <span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>, |
| new_span: Attributes<<span class="lifetime">'_</span>>, |
| dispatch: <span class="kw-2">&</span>Dispatch, |
| ) -> Span { |
| <span class="kw">let </span>attrs = <span class="kw-2">&</span>new_span; |
| <span class="kw">let </span>id = dispatch.new_span(attrs); |
| <span class="kw">let </span>inner = <span class="prelude-val">Some</span>(Inner::new(id, dispatch)); |
| |
| <span class="kw">let </span>span = <span class="self">Self </span>{ |
| inner, |
| meta: <span class="prelude-val">Some</span>(meta), |
| }; |
| |
| <span class="macro">if_log_enabled! </span>{ <span class="kw-2">*</span>meta.level(), { |
| <span class="kw">let </span>target = <span class="kw">if </span>attrs.is_empty() { |
| LIFECYCLE_LOG_TARGET |
| } <span class="kw">else </span>{ |
| meta.target() |
| }; |
| <span class="kw">let </span>values = attrs.values(); |
| span.log( |
| target, |
| <span class="macro">level_to_log!</span>(<span class="kw-2">*</span>meta.level()), |
| <span class="macro">format_args!</span>(<span class="string">"++ {};{}"</span>, meta.name(), <span class="kw">crate</span>::log::LogValueSet { values, is_first: <span class="bool-val">false </span>}), |
| ); |
| }} |
| |
| span |
| } |
| |
| <span class="doccomment">/// Enters this span, returning a guard that will exit the span when dropped. |
| /// |
| /// If this span is enabled by the current subscriber, then this function will |
| /// call [`Subscriber::enter`] with the span's [`Id`], and dropping the guard |
| /// will call [`Subscriber::exit`]. If the span is disabled, this does |
| /// nothing. |
| /// |
| /// # In Asynchronous Code |
| /// |
| /// **Warning**: in asynchronous code that uses [async/await syntax][syntax], |
| /// `Span::enter` should be used very carefully or avoided entirely. Holding |
| /// the drop guard returned by `Span::enter` across `.await` points will |
| /// result in incorrect traces. For example, |
| /// |
| /// ``` |
| /// # use tracing::info_span; |
| /// # async fn some_other_async_function() {} |
| /// async fn my_async_function() { |
| /// let span = info_span!("my_async_function"); |
| /// |
| /// // WARNING: This span will remain entered until this |
| /// // guard is dropped... |
| /// let _enter = span.enter(); |
| /// // ...but the `await` keyword may yield, causing the |
| /// // runtime to switch to another task, while remaining in |
| /// // this span! |
| /// some_other_async_function().await |
| /// |
| /// // ... |
| /// } |
| /// ``` |
| /// |
| /// The drop guard returned by `Span::enter` exits the span when it is |
| /// dropped. When an async function or async block yields at an `.await` |
| /// point, the current scope is _exited_, but values in that scope are |
| /// **not** dropped (because the async block will eventually resume |
| /// execution from that await point). This means that _another_ task will |
| /// begin executing while _remaining_ in the entered span. This results in |
| /// an incorrect trace. |
| /// |
| /// Instead of using `Span::enter` in asynchronous code, prefer the |
| /// following: |
| /// |
| /// * To enter a span for a synchronous section of code within an async |
| /// block or function, prefer [`Span::in_scope`]. Since `in_scope` takes a |
| /// synchronous closure and exits the span when the closure returns, the |
| /// span will always be exited before the next await point. For example: |
| /// ``` |
| /// # use tracing::info_span; |
| /// # async fn some_other_async_function(_: ()) {} |
| /// async fn my_async_function() { |
| /// let span = info_span!("my_async_function"); |
| /// |
| /// let some_value = span.in_scope(|| { |
| /// // run some synchronous code inside the span... |
| /// }); |
| /// |
| /// // This is okay! The span has already been exited before we reach |
| /// // the await point. |
| /// some_other_async_function(some_value).await; |
| /// |
| /// // ... |
| /// } |
| /// ``` |
| /// * For instrumenting asynchronous code, `tracing` provides the |
| /// [`Future::instrument` combinator][instrument] for |
| /// attaching a span to a future (async function or block). This will |
| /// enter the span _every_ time the future is polled, and exit it whenever |
| /// the future yields. |
| /// |
| /// `Instrument` can be used with an async block inside an async function: |
| /// ```ignore |
| /// # use tracing::info_span; |
| /// use tracing::Instrument; |
| /// |
| /// # async fn some_other_async_function() {} |
| /// async fn my_async_function() { |
| /// let span = info_span!("my_async_function"); |
| /// async move { |
| /// // This is correct! If we yield here, the span will be exited, |
| /// // and re-entered when we resume. |
| /// some_other_async_function().await; |
| /// |
| /// //more asynchronous code inside the span... |
| /// |
| /// } |
| /// // instrument the async block with the span... |
| /// .instrument(span) |
| /// // ...and await it. |
| /// .await |
| /// } |
| /// ``` |
| /// |
| /// It can also be used to instrument calls to async functions at the |
| /// callsite: |
| /// ```ignore |
| /// # use tracing::debug_span; |
| /// use tracing::Instrument; |
| /// |
| /// # async fn some_other_async_function() {} |
| /// async fn my_async_function() { |
| /// let some_value = some_other_async_function() |
| /// .instrument(debug_span!("some_other_async_function")) |
| /// .await; |
| /// |
| /// // ... |
| /// } |
| /// ``` |
| /// |
| /// * The [`#[instrument]` attribute macro][attr] can automatically generate |
| /// correct code when used on an async function: |
| /// |
| /// ```ignore |
| /// # async fn some_other_async_function() {} |
| /// #[tracing::instrument(level = "info")] |
| /// async fn my_async_function() { |
| /// |
| /// // This is correct! If we yield here, the span will be exited, |
| /// // and re-entered when we resume. |
| /// some_other_async_function().await; |
| /// |
| /// // ... |
| /// |
| /// } |
| /// ``` |
| /// |
| /// [syntax]: https://rust-lang.github.io/async-book/01_getting_started/04_async_await_primer.html |
| /// [`Span::in_scope`]: Span::in_scope() |
| /// [instrument]: crate::Instrument |
| /// [attr]: macro@crate::instrument |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use tracing::{span, Level}; |
| /// let span = span!(Level::INFO, "my_span"); |
| /// let guard = span.enter(); |
| /// |
| /// // code here is within the span |
| /// |
| /// drop(guard); |
| /// |
| /// // code here is no longer within the span |
| /// |
| /// ``` |
| /// |
| /// Guards need not be explicitly dropped: |
| /// |
| /// ``` |
| /// # use tracing::trace_span; |
| /// fn my_function() -> String { |
| /// // enter a span for the duration of this function. |
| /// let span = trace_span!("my_function"); |
| /// let _enter = span.enter(); |
| /// |
| /// // anything happening in functions we call is still inside the span... |
| /// my_other_function(); |
| /// |
| /// // returning from the function drops the guard, exiting the span. |
| /// return "Hello world".to_owned(); |
| /// } |
| /// |
| /// fn my_other_function() { |
| /// // ... |
| /// } |
| /// ``` |
| /// |
| /// Sub-scopes may be created to limit the duration for which the span is |
| /// entered: |
| /// |
| /// ``` |
| /// # use tracing::{info, info_span}; |
| /// let span = info_span!("my_great_span"); |
| /// |
| /// { |
| /// let _enter = span.enter(); |
| /// |
| /// // this event occurs inside the span. |
| /// info!("i'm in the span!"); |
| /// |
| /// // exiting the scope drops the guard, exiting the span. |
| /// } |
| /// |
| /// // this event is not inside the span. |
| /// info!("i'm outside the span!") |
| /// ``` |
| /// |
| /// [`Subscriber::enter`]: super::subscriber::Subscriber::enter() |
| /// [`Subscriber::exit`]: super::subscriber::Subscriber::exit() |
| /// [`Id`]: super::Id |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub fn </span>enter(<span class="kw-2">&</span><span class="self">self</span>) -> Entered<<span class="lifetime">'_</span>> { |
| <span class="self">self</span>.do_enter(); |
| Entered { span: <span class="self">self </span>} |
| } |
| |
| <span class="doccomment">/// Enters this span, consuming it and returning a [guard][`EnteredSpan`] |
| /// that will exit the span when dropped. |
| /// |
| /// <pre class="compile_fail" style="white-space:normal;font:inherit;"> |
| /// <strong>Warning</strong>: In asynchronous code that uses async/await syntax, |
| /// <code>Span::entered</code> may produce incorrect traces if the returned drop |
| /// guard is held across an await point. See <a href="#in-asynchronous-code">the |
| /// <code>Span::enter</code> documentation</a> for details. |
| /// </pre> |
| /// |
| /// |
| /// If this span is enabled by the current subscriber, then this function will |
| /// call [`Subscriber::enter`] with the span's [`Id`], and dropping the guard |
| /// will call [`Subscriber::exit`]. If the span is disabled, this does |
| /// nothing. |
| /// |
| /// This is similar to the [`Span::enter`] method, except that it moves the |
| /// span by value into the returned guard, rather than borrowing it. |
| /// Therefore, this method can be used to create and enter a span in a |
| /// single expression, without requiring a `let`-binding. For example: |
| /// |
| /// ``` |
| /// # use tracing::info_span; |
| /// let _span = info_span!("something_interesting").entered(); |
| /// ``` |
| /// rather than: |
| /// ``` |
| /// # use tracing::info_span; |
| /// let span = info_span!("something_interesting"); |
| /// let _e = span.enter(); |
| /// ``` |
| /// |
| /// Furthermore, `entered` may be used when the span must be stored in some |
| /// other struct or be passed to a function while remaining entered. |
| /// |
| /// <pre class="ignore" style="white-space:normal;font:inherit;"> |
| /// <strong>Note</strong>: The returned <a href="../struct.EnteredSpan.html"> |
| /// <code>EnteredSpan</a></code> guard does not implement <code>Send</code>. |
| /// Dropping the guard will exit <em>this</em> span, and if the guard is sent |
| /// to another thread and dropped there, that thread may never have entered |
| /// this span. Thus, <code>EnteredSpan</code>s should not be sent between threads. |
| /// </pre> |
| /// |
| /// [syntax]: https://rust-lang.github.io/async-book/01_getting_started/04_async_await_primer.html |
| /// |
| /// # Examples |
| /// |
| /// The returned guard can be [explicitly exited][EnteredSpan::exit], |
| /// returning the un-entered span: |
| /// |
| /// ``` |
| /// # use tracing::{Level, span}; |
| /// let span = span!(Level::INFO, "doing_something").entered(); |
| /// |
| /// // code here is within the span |
| /// |
| /// // explicitly exit the span, returning it |
| /// let span = span.exit(); |
| /// |
| /// // code here is no longer within the span |
| /// |
| /// // enter the span again |
| /// let span = span.entered(); |
| /// |
| /// // now we are inside the span once again |
| /// ``` |
| /// |
| /// Guards need not be explicitly dropped: |
| /// |
| /// ``` |
| /// # use tracing::trace_span; |
| /// fn my_function() -> String { |
| /// // enter a span for the duration of this function. |
| /// let span = trace_span!("my_function").entered(); |
| /// |
| /// // anything happening in functions we call is still inside the span... |
| /// my_other_function(); |
| /// |
| /// // returning from the function drops the guard, exiting the span. |
| /// return "Hello world".to_owned(); |
| /// } |
| /// |
| /// fn my_other_function() { |
| /// // ... |
| /// } |
| /// ``` |
| /// |
| /// Since the [`EnteredSpan`] guard can dereference to the [`Span`] itself, |
| /// the span may still be accessed while entered. For example: |
| /// |
| /// ```rust |
| /// # use tracing::info_span; |
| /// use tracing::field; |
| /// |
| /// // create the span with an empty field, and enter it. |
| /// let span = info_span!("my_span", some_field = field::Empty).entered(); |
| /// |
| /// // we can still record a value for the field while the span is entered. |
| /// span.record("some_field", &"hello world!"); |
| /// ``` |
| /// |
| |
| /// [`Subscriber::enter`]: super::subscriber::Subscriber::enter() |
| /// [`Subscriber::exit`]: super::subscriber::Subscriber::exit() |
| /// [`Id`]: super::Id |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub fn </span>entered(<span class="self">self</span>) -> EnteredSpan { |
| <span class="self">self</span>.do_enter(); |
| EnteredSpan { |
| span: <span class="self">self</span>, |
| _not_send: PhantomNotSend, |
| } |
| } |
| |
| <span class="doccomment">/// Returns this span, if it was [enabled] by the current [`Subscriber`], or |
| /// the [current span] (whose lexical distance may be further than expected), |
| /// if this span [is disabled]. |
| /// |
| /// This method can be useful when propagating spans to spawned threads or |
| /// [async tasks]. Consider the following: |
| /// |
| /// ``` |
| /// let _parent_span = tracing::info_span!("parent").entered(); |
| /// |
| /// // ... |
| /// |
| /// let child_span = tracing::debug_span!("child"); |
| /// |
| /// std::thread::spawn(move || { |
| /// let _entered = child_span.entered(); |
| /// |
| /// tracing::info!("spawned a thread!"); |
| /// |
| /// // ... |
| /// }); |
| /// ``` |
| /// |
| /// If the current [`Subscriber`] enables the [`DEBUG`] level, then both |
| /// the "parent" and "child" spans will be enabled. Thus, when the "spawaned |
| /// a thread!" event occurs, it will be inside of the "child" span. Because |
| /// "parent" is the parent of "child", the event will _also_ be inside of |
| /// "parent". |
| /// |
| /// However, if the [`Subscriber`] only enables the [`INFO`] level, the "child" |
| /// span will be disabled. When the thread is spawned, the |
| /// `child_span.entered()` call will do nothing, since "child" is not |
| /// enabled. In this case, the "spawned a thread!" event occurs outside of |
| /// *any* span, since the "child" span was responsible for propagating its |
| /// parent to the spawned thread. |
| /// |
| /// If this is not the desired behavior, `Span::or_current` can be used to |
| /// ensure that the "parent" span is propagated in both cases, either as a |
| /// parent of "child" _or_ directly. For example: |
| /// |
| /// ``` |
| /// let _parent_span = tracing::info_span!("parent").entered(); |
| /// |
| /// // ... |
| /// |
| /// // If DEBUG is enabled, then "child" will be enabled, and `or_current` |
| /// // returns "child". Otherwise, if DEBUG is not enabled, "child" will be |
| /// // disabled, and `or_current` returns "parent". |
| /// let child_span = tracing::debug_span!("child").or_current(); |
| /// |
| /// std::thread::spawn(move || { |
| /// let _entered = child_span.entered(); |
| /// |
| /// tracing::info!("spawned a thread!"); |
| /// |
| /// // ... |
| /// }); |
| /// ``` |
| /// |
| /// When spawning [asynchronous tasks][async tasks], `Span::or_current` can |
| /// be used similarly, in combination with [`instrument`]: |
| /// |
| /// ``` |
| /// use tracing::Instrument; |
| /// # // lol |
| /// # mod tokio { |
| /// # pub(super) fn spawn(_: impl std::future::Future) {} |
| /// # } |
| /// |
| /// let _parent_span = tracing::info_span!("parent").entered(); |
| /// |
| /// // ... |
| /// |
| /// let child_span = tracing::debug_span!("child"); |
| /// |
| /// tokio::spawn( |
| /// async { |
| /// tracing::info!("spawned a task!"); |
| /// |
| /// // ... |
| /// |
| /// }.instrument(child_span.or_current()) |
| /// ); |
| /// ``` |
| /// |
| /// In general, `or_current` should be preferred over nesting an |
| /// [`instrument`] call inside of an [`in_current_span`] call, as using |
| /// `or_current` will be more efficient. |
| /// |
| /// ``` |
| /// use tracing::Instrument; |
| /// # // lol |
| /// # mod tokio { |
| /// # pub(super) fn spawn(_: impl std::future::Future) {} |
| /// # } |
| /// async fn my_async_fn() { |
| /// // ... |
| /// } |
| /// |
| /// let _parent_span = tracing::info_span!("parent").entered(); |
| /// |
| /// // Do this: |
| /// tokio::spawn( |
| /// my_async_fn().instrument(tracing::debug_span!("child").or_current()) |
| /// ); |
| /// |
| /// // ...rather than this: |
| /// tokio::spawn( |
| /// my_async_fn() |
| /// .instrument(tracing::debug_span!("child")) |
| /// .in_current_span() |
| /// ); |
| /// ``` |
| /// |
| /// [enabled]: crate::Subscriber::enabled |
| /// [`Subscriber`]: crate::Subscriber |
| /// [current span]: Span::current |
| /// [is disabled]: Span::is_disabled |
| /// [`INFO`]: crate::Level::INFO |
| /// [`DEBUG`]: crate::Level::DEBUG |
| /// [async tasks]: std::task |
| /// [`instrument`]: crate::instrument::Instrument::instrument |
| /// [`in_current_span`]: crate::instrument::Instrument::in_current_span |
| </span><span class="kw">pub fn </span>or_current(<span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="kw">if </span><span class="self">self</span>.is_disabled() { |
| <span class="kw">return </span><span class="self">Self</span>::current(); |
| } |
| <span class="self">self |
| </span>} |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>do_enter(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.as_ref() { |
| inner.subscriber.enter(<span class="kw-2">&</span>inner.id); |
| } |
| |
| <span class="macro">if_log_enabled! </span>{ <span class="kw">crate</span>::Level::TRACE, { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(_meta) = <span class="self">self</span>.meta { |
| <span class="self">self</span>.log(ACTIVITY_LOG_TARGET, log::Level::Trace, <span class="macro">format_args!</span>(<span class="string">"-> {};"</span>, _meta.name())); |
| } |
| }} |
| } |
| |
| <span class="comment">// Called from [`Entered`] and [`EnteredSpan`] drops. |
| // |
| // Running this behaviour on drop rather than with an explicit function |
| // call means that spans may still be exited when unwinding. |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>do_exit(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.inner.as_ref() { |
| inner.subscriber.exit(<span class="kw-2">&</span>inner.id); |
| } |
| |
| <span class="macro">if_log_enabled! </span>{ <span class="kw">crate</span>::Level::TRACE, { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(_meta) = <span class="self">self</span>.meta { |
| <span class="self">self</span>.log(ACTIVITY_LOG_TARGET, log::Level::Trace, <span class="macro">format_args!</span>(<span class="string">"<- {};"</span>, _meta.name())); |
| } |
| }} |
| } |
| |
| <span class="doccomment">/// Executes the given function in the context of this span. |
| /// |
| /// If this span is enabled, then this function enters the span, invokes `f` |
| /// and then exits the span. If the span is disabled, `f` will still be |
| /// invoked, but in the context of the currently-executing span (if there is |
| /// one). |
| /// |
| /// Returns the result of evaluating `f`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use tracing::{trace, span, Level}; |
| /// let my_span = span!(Level::TRACE, "my_span"); |
| /// |
| /// my_span.in_scope(|| { |
| /// // this event occurs within the span. |
| /// trace!("i'm in the span!"); |
| /// }); |
| /// |
| /// // this event occurs outside the span. |
| /// trace!("i'm not in the span!"); |
| /// ``` |
| /// |
| /// Calling a function and returning the result: |
| /// ``` |
| /// # use tracing::{info_span, Level}; |
| /// fn hello_world() -> String { |
| /// "Hello world!".to_owned() |
| /// } |
| /// |
| /// let span = info_span!("hello_world"); |
| /// // the span will be entered for the duration of the call to |
| /// // `hello_world`. |
| /// let a_string = span.in_scope(hello_world); |
| /// |
| </span><span class="kw">pub fn </span>in_scope<F: FnOnce() -> T, T>(<span class="kw-2">&</span><span class="self">self</span>, f: F) -> T { |
| <span class="kw">let </span>_enter = <span class="self">self</span>.enter(); |
| f() |
| } |
| |
| <span class="doccomment">/// Returns a [`Field`][super::field::Field] for the field with the |
| /// given `name`, if one exists, |
| </span><span class="kw">pub fn </span>field<Q: <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, field: <span class="kw-2">&</span>Q) -> <span class="prelude-ty">Option</span><field::Field> |
| <span class="kw">where |
| </span>Q: field::AsField, |
| { |
| <span class="self">self</span>.metadata().and_then(|meta| field.as_field(meta)) |
| } |
| |
| <span class="doccomment">/// Returns true if this `Span` has a field for the given |
| /// [`Field`][super::field::Field] or field name. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>has_field<Q: <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, field: <span class="kw-2">&</span>Q) -> bool |
| <span class="kw">where |
| </span>Q: field::AsField, |
| { |
| <span class="self">self</span>.field(field).is_some() |
| } |
| |
| <span class="doccomment">/// Records that the field described by `field` has the value `value`. |
| /// |
| /// This may be used with [`field::Empty`] to declare fields whose values |
| /// are not known when the span is created, and record them later: |
| /// ``` |
| /// use tracing::{trace_span, field}; |
| /// |
| /// // Create a span with two fields: `greeting`, with the value "hello world", and |
| /// // `parting`, without a value. |
| /// let span = trace_span!("my_span", greeting = "hello world", parting = field::Empty); |
| /// |
| /// // ... |
| /// |
| /// // Now, record a value for parting as well. |
| /// // (note that the field name is passed as a string slice) |
| /// span.record("parting", "goodbye world!"); |
| /// ``` |
| /// However, it may also be used to record a _new_ value for a field whose |
| /// value was already recorded: |
| /// ``` |
| /// use tracing::info_span; |
| /// # fn do_something() -> Result<(), ()> { Err(()) } |
| /// |
| /// // Initially, let's assume that our attempt to do something is going okay... |
| /// let span = info_span!("doing_something", is_okay = true); |
| /// let _e = span.enter(); |
| /// |
| /// match do_something() { |
| /// Ok(something) => { |
| /// // ... |
| /// } |
| /// Err(_) => { |
| /// // Things are no longer okay! |
| /// span.record("is_okay", false); |
| /// } |
| /// } |
| /// ``` |
| /// |
| /// <pre class="ignore" style="white-space:normal;font:inherit;"> |
| /// <strong>Note</strong>: The fields associated with a span are part |
| /// of its <a href="../struct.Metadata.html"><code>Metadata</code></a>. |
| /// The <a href="../struct.Metadata.html"><code>Metadata</code></a> |
| /// describing a particular span is constructed statically when the span |
| /// is created and cannot be extended later to add new fields. Therefore, |
| /// you cannot record a value for a field that was not specified when the |
| /// span was created: |
| /// </pre> |
| /// |
| /// ``` |
| /// use tracing::{trace_span, field}; |
| /// |
| /// // Create a span with two fields: `greeting`, with the value "hello world", and |
| /// // `parting`, without a value. |
| /// let span = trace_span!("my_span", greeting = "hello world", parting = field::Empty); |
| /// |
| /// // ... |
| /// |
| /// // Now, you try to record a value for a new field, `new_field`, which was not |
| /// // declared as `Empty` or populated when you created `span`. |
| /// // You won't get any error, but the assignment will have no effect! |
| /// span.record("new_field", "interesting_value_you_really_need"); |
| /// |
| /// // Instead, all fields that may be recorded after span creation should be declared up front, |
| /// // using field::Empty when a value is not known, as we did for `parting`. |
| /// // This `record` call will indeed replace field::Empty with "you will be remembered". |
| /// span.record("parting", "you will be remembered"); |
| /// ``` |
| /// |
| /// [`field::Empty`]: super::field::Empty |
| /// [`Metadata`]: super::Metadata |
| </span><span class="kw">pub fn </span>record<Q: <span class="question-mark">?</span>Sized, V>(<span class="kw-2">&</span><span class="self">self</span>, field: <span class="kw-2">&</span>Q, value: V) -> <span class="kw-2">&</span><span class="self">Self |
| </span><span class="kw">where |
| </span>Q: field::AsField, |
| V: field::Value, |
| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(meta) = <span class="self">self</span>.meta { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(field) = field.as_field(meta) { |
| <span class="self">self</span>.record_all( |
| <span class="kw-2">&</span>meta |
| .fields() |
| .value_set(<span class="kw-2">&</span>[(<span class="kw-2">&</span>field, <span class="prelude-val">Some</span>(<span class="kw-2">&</span>value <span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>field::Value))]), |
| ); |
| } |
| } |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Records all the fields in the provided `ValueSet`. |
| </span><span class="kw">pub fn </span>record_all(<span class="kw-2">&</span><span class="self">self</span>, values: <span class="kw-2">&</span>field::ValueSet<<span class="lifetime">'_</span>>) -> <span class="kw-2">&</span><span class="self">Self </span>{ |
| <span class="kw">let </span>record = Record::new(values); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>inner) = <span class="self">self</span>.inner { |
| inner.record(<span class="kw-2">&</span>record); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(_meta) = <span class="self">self</span>.meta { |
| <span class="macro">if_log_enabled! </span>{ <span class="kw-2">*</span>_meta.level(), { |
| <span class="kw">let </span>target = <span class="kw">if </span>record.is_empty() { |
| LIFECYCLE_LOG_TARGET |
| } <span class="kw">else </span>{ |
| _meta.target() |
| }; |
| <span class="self">self</span>.log( |
| target, |
| <span class="macro">level_to_log!</span>(<span class="kw-2">*</span>_meta.level()), |
| <span class="macro">format_args!</span>(<span class="string">"{};{}"</span>, _meta.name(), <span class="kw">crate</span>::log::LogValueSet { values, is_first: <span class="bool-val">false </span>}), |
| ); |
| }} |
| } |
| |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Returns `true` if this span was disabled by the subscriber and does not |
| /// exist. |
| /// |
| /// See also [`is_none`]. |
| /// |
| /// [`is_none`]: Span::is_none() |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_disabled(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.inner.is_none() |
| } |
| |
| <span class="doccomment">/// Returns `true` if this span was constructed by [`Span::none`] and is |
| /// empty. |
| /// |
| /// If `is_none` returns `true` for a given span, then [`is_disabled`] will |
| /// also return `true`. However, when a span is disabled by the subscriber |
| /// rather than constructed by `Span::none`, this method will return |
| /// `false`, while `is_disabled` will return `true`. |
| /// |
| /// [`Span::none`]: Span::none() |
| /// [`is_disabled`]: Span::is_disabled() |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_none(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.is_disabled() && <span class="self">self</span>.meta.is_none() |
| } |
| |
| <span class="doccomment">/// Indicates that the span with the given ID has an indirect causal |
| /// relationship with this span. |
| /// |
| /// This relationship differs somewhat from the parent-child relationship: a |
| /// span may have any number of prior spans, rather than a single one; and |
| /// spans are not considered to be executing _inside_ of the spans they |
| /// follow from. This means that a span may close even if subsequent spans |
| /// that follow from it are still open, and time spent inside of a |
| /// subsequent span should not be included in the time its precedents were |
| /// executing. This is used to model causal relationships such as when a |
| /// single future spawns several related background tasks, et cetera. |
| /// |
| /// If this span is disabled, or the resulting follows-from relationship |
| /// would be invalid, this function will do nothing. |
| /// |
| /// # Examples |
| /// |
| /// Setting a `follows_from` relationship with a `Span`: |
| /// ``` |
| /// # use tracing::{span, Id, Level, Span}; |
| /// let span1 = span!(Level::INFO, "span_1"); |
| /// let span2 = span!(Level::DEBUG, "span_2"); |
| /// span2.follows_from(span1); |
| /// ``` |
| /// |
| /// Setting a `follows_from` relationship with the current span: |
| /// ``` |
| /// # use tracing::{span, Id, Level, Span}; |
| /// let span = span!(Level::INFO, "hello!"); |
| /// span.follows_from(Span::current()); |
| /// ``` |
| /// |
| /// Setting a `follows_from` relationship with a `Span` reference: |
| /// ``` |
| /// # use tracing::{span, Id, Level, Span}; |
| /// let span = span!(Level::INFO, "hello!"); |
| /// let curr = Span::current(); |
| /// span.follows_from(&curr); |
| /// ``` |
| /// |
| /// Setting a `follows_from` relationship with an `Id`: |
| /// ``` |
| /// # use tracing::{span, Id, Level, Span}; |
| /// let span = span!(Level::INFO, "hello!"); |
| /// let id = span.id(); |
| /// span.follows_from(id); |
| /// ``` |
| </span><span class="kw">pub fn </span>follows_from(<span class="kw-2">&</span><span class="self">self</span>, from: <span class="kw">impl </span>Into<<span class="prelude-ty">Option</span><Id>>) -> <span class="kw-2">&</span><span class="self">Self </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>inner) = <span class="self">self</span>.inner { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(from) = from.into() { |
| inner.follows_from(<span class="kw-2">&</span>from); |
| } |
| } |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Returns this span's `Id`, if it is enabled. |
| </span><span class="kw">pub fn </span>id(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Id> { |
| <span class="self">self</span>.inner.as_ref().map(Inner::id) |
| } |
| |
| <span class="doccomment">/// Returns this span's `Metadata`, if it is enabled. |
| </span><span class="kw">pub fn </span>metadata(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>Metadata<<span class="lifetime">'static</span>>> { |
| <span class="self">self</span>.meta |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"log"</span>)] |
| #[inline] |
| </span><span class="kw">fn </span>log(<span class="kw-2">&</span><span class="self">self</span>, target: <span class="kw-2">&</span>str, level: log::Level, message: fmt::Arguments<<span class="lifetime">'_</span>>) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(meta) = <span class="self">self</span>.meta { |
| <span class="kw">if </span><span class="macro">level_to_log!</span>(<span class="kw-2">*</span>meta.level()) <= log::max_level() { |
| <span class="kw">let </span>logger = log::logger(); |
| <span class="kw">let </span>log_meta = log::Metadata::builder().level(level).target(target).build(); |
| <span class="kw">if </span>logger.enabled(<span class="kw-2">&</span>log_meta) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>inner) = <span class="self">self</span>.inner { |
| logger.log( |
| <span class="kw-2">&</span>log::Record::builder() |
| .metadata(log_meta) |
| .module_path(meta.module_path()) |
| .file(meta.file()) |
| .line(meta.line()) |
| .args(<span class="macro">format_args!</span>(<span class="string">"{} span={}"</span>, message, inner.id.into_u64())) |
| .build(), |
| ); |
| } <span class="kw">else </span>{ |
| logger.log( |
| <span class="kw-2">&</span>log::Record::builder() |
| .metadata(log_meta) |
| .module_path(meta.module_path()) |
| .file(meta.file()) |
| .line(meta.line()) |
| .args(message) |
| .build(), |
| ); |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Invokes a function with a reference to this span's ID and subscriber. |
| /// |
| /// if this span is enabled, the provided function is called, and the result is returned. |
| /// If the span is disabled, the function is not called, and this method returns `None` |
| /// instead. |
| </span><span class="kw">pub fn </span>with_subscriber<T>(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw">impl </span>FnOnce((<span class="kw-2">&</span>Id, <span class="kw-2">&</span>Dispatch)) -> T) -> <span class="prelude-ty">Option</span><T> { |
| <span class="self">self</span>.inner |
| .as_ref() |
| .map(|inner| f((<span class="kw-2">&</span>inner.id, <span class="kw-2">&</span>inner.subscriber))) |
| } |
| } |
| |
| <span class="kw">impl </span>cmp::PartialEq <span class="kw">for </span>Span { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="kw">match </span>(<span class="kw-2">&</span><span class="self">self</span>.meta, <span class="kw-2">&</span>other.meta) { |
| (<span class="prelude-val">Some</span>(this), <span class="prelude-val">Some</span>(that)) => { |
| this.callsite() == that.callsite() && <span class="self">self</span>.inner == other.inner |
| } |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Hash <span class="kw">for </span>Span { |
| <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, hasher: <span class="kw-2">&mut </span>H) { |
| <span class="self">self</span>.inner.hash(hasher); |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Span { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="kw">let </span><span class="kw-2">mut </span>span = f.debug_struct(<span class="string">"Span"</span>); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(meta) = <span class="self">self</span>.meta { |
| span.field(<span class="string">"name"</span>, <span class="kw-2">&</span>meta.name()) |
| .field(<span class="string">"level"</span>, <span class="kw-2">&</span>meta.level()) |
| .field(<span class="string">"target"</span>, <span class="kw-2">&</span>meta.target()); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>inner) = <span class="self">self</span>.inner { |
| span.field(<span class="string">"id"</span>, <span class="kw-2">&</span>inner.id()); |
| } <span class="kw">else </span>{ |
| span.field(<span class="string">"disabled"</span>, <span class="kw-2">&</span><span class="bool-val">true</span>); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>path) = meta.module_path() { |
| span.field(<span class="string">"module_path"</span>, <span class="kw-2">&</span>path); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>line) = meta.line() { |
| span.field(<span class="string">"line"</span>, <span class="kw-2">&</span>line); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>file) = meta.file() { |
| span.field(<span class="string">"file"</span>, <span class="kw-2">&</span>file); |
| } |
| } <span class="kw">else </span>{ |
| span.field(<span class="string">"none"</span>, <span class="kw-2">&</span><span class="bool-val">true</span>); |
| } |
| |
| span.finish() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> From<<span class="kw-2">&</span><span class="lifetime">'a </span>Span> <span class="kw">for </span><span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>Id> { |
| <span class="kw">fn </span>from(span: <span class="kw-2">&</span><span class="lifetime">'a </span>Span) -> <span class="self">Self </span>{ |
| span.inner.as_ref().map(|inner| <span class="kw-2">&</span>inner.id) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> From<<span class="kw-2">&</span><span class="lifetime">'a </span>Span> <span class="kw">for </span><span class="prelude-ty">Option</span><Id> { |
| <span class="kw">fn </span>from(span: <span class="kw-2">&</span><span class="lifetime">'a </span>Span) -> <span class="self">Self </span>{ |
| span.inner.as_ref().map(Inner::id) |
| } |
| } |
| |
| <span class="kw">impl </span>From<Span> <span class="kw">for </span><span class="prelude-ty">Option</span><Id> { |
| <span class="kw">fn </span>from(span: Span) -> <span class="self">Self </span>{ |
| span.inner.as_ref().map(Inner::id) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> From<<span class="kw-2">&</span><span class="lifetime">'a </span>EnteredSpan> <span class="kw">for </span><span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>Id> { |
| <span class="kw">fn </span>from(span: <span class="kw-2">&</span><span class="lifetime">'a </span>EnteredSpan) -> <span class="self">Self </span>{ |
| span.inner.as_ref().map(|inner| <span class="kw-2">&</span>inner.id) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> From<<span class="kw-2">&</span><span class="lifetime">'a </span>EnteredSpan> <span class="kw">for </span><span class="prelude-ty">Option</span><Id> { |
| <span class="kw">fn </span>from(span: <span class="kw-2">&</span><span class="lifetime">'a </span>EnteredSpan) -> <span class="self">Self </span>{ |
| span.inner.as_ref().map(Inner::id) |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>Span { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(Inner { |
| <span class="kw-2">ref </span>id, |
| <span class="kw-2">ref </span>subscriber, |
| }) = <span class="self">self</span>.inner |
| { |
| subscriber.try_close(id.clone()); |
| } |
| |
| <span class="macro">if_log_enabled! </span>{ <span class="kw">crate</span>::Level::TRACE, { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(meta) = <span class="self">self</span>.meta { |
| <span class="self">self</span>.log( |
| LIFECYCLE_LOG_TARGET, |
| log::Level::Trace, |
| <span class="macro">format_args!</span>(<span class="string">"-- {};"</span>, meta.name()), |
| ); |
| } |
| }} |
| } |
| } |
| |
| <span class="comment">// ===== impl Inner ===== |
| |
| </span><span class="kw">impl </span>Inner { |
| <span class="doccomment">/// Indicates that the span with the given ID has an indirect causal |
| /// relationship with this span. |
| /// |
| /// This relationship differs somewhat from the parent-child relationship: a |
| /// span may have any number of prior spans, rather than a single one; and |
| /// spans are not considered to be executing _inside_ of the spans they |
| /// follow from. This means that a span may close even if subsequent spans |
| /// that follow from it are still open, and time spent inside of a |
| /// subsequent span should not be included in the time its precedents were |
| /// executing. This is used to model causal relationships such as when a |
| /// single future spawns several related background tasks, et cetera. |
| /// |
| /// If this span is disabled, this function will do nothing. Otherwise, it |
| /// returns `Ok(())` if the other span was added as a precedent of this |
| /// span, or an error if this was not possible. |
| </span><span class="kw">fn </span>follows_from(<span class="kw-2">&</span><span class="self">self</span>, from: <span class="kw-2">&</span>Id) { |
| <span class="self">self</span>.subscriber.record_follows_from(<span class="kw-2">&</span><span class="self">self</span>.id, from) |
| } |
| |
| <span class="doccomment">/// Returns the span's ID. |
| </span><span class="kw">fn </span>id(<span class="kw-2">&</span><span class="self">self</span>) -> Id { |
| <span class="self">self</span>.id.clone() |
| } |
| |
| <span class="kw">fn </span>record(<span class="kw-2">&</span><span class="self">self</span>, values: <span class="kw-2">&</span>Record<<span class="lifetime">'_</span>>) { |
| <span class="self">self</span>.subscriber.record(<span class="kw-2">&</span><span class="self">self</span>.id, values) |
| } |
| |
| <span class="kw">fn </span>new(id: Id, subscriber: <span class="kw-2">&</span>Dispatch) -> <span class="self">Self </span>{ |
| Inner { |
| id, |
| subscriber: subscriber.clone(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>cmp::PartialEq <span class="kw">for </span>Inner { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <span class="self">self</span>.id == other.id |
| } |
| } |
| |
| <span class="kw">impl </span>Hash <span class="kw">for </span>Inner { |
| <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) { |
| <span class="self">self</span>.id.hash(state); |
| } |
| } |
| |
| <span class="kw">impl </span>Clone <span class="kw">for </span>Inner { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| Inner { |
| id: <span class="self">self</span>.subscriber.clone_span(<span class="kw-2">&</span><span class="self">self</span>.id), |
| subscriber: <span class="self">self</span>.subscriber.clone(), |
| } |
| } |
| } |
| |
| <span class="comment">// ===== impl Entered ===== |
| |
| </span><span class="kw">impl </span>EnteredSpan { |
| <span class="doccomment">/// Returns this span's `Id`, if it is enabled. |
| </span><span class="kw">pub fn </span>id(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Id> { |
| <span class="self">self</span>.inner.as_ref().map(Inner::id) |
| } |
| |
| <span class="doccomment">/// Exits this span, returning the underlying [`Span`]. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>exit(<span class="kw-2">mut </span><span class="self">self</span>) -> Span { |
| <span class="comment">// One does not simply move out of a struct with `Drop`. |
| </span><span class="kw">let </span>span = mem::replace(<span class="kw-2">&mut </span><span class="self">self</span>.span, Span::none()); |
| span.do_exit(); |
| span |
| } |
| } |
| |
| <span class="kw">impl </span>Deref <span class="kw">for </span>EnteredSpan { |
| <span class="kw">type </span>Target = Span; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Span { |
| <span class="kw-2">&</span><span class="self">self</span>.span |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Drop <span class="kw">for </span>Entered<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.span.do_exit() |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>EnteredSpan { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.span.do_exit() |
| } |
| } |
| |
| <span class="doccomment">/// Technically, `EnteredSpan` _can_ implement both `Send` *and* |
| /// `Sync` safely. It doesn't, because it has a `PhantomNotSend` field, |
| /// specifically added in order to make it `!Send`. |
| /// |
| /// Sending an `EnteredSpan` guard between threads cannot cause memory unsafety. |
| /// However, it *would* result in incorrect behavior, so we add a |
| /// `PhantomNotSend` to prevent it from being sent between threads. This is |
| /// because it must be *dropped* on the same thread that it was created; |
| /// otherwise, the span will never be exited on the thread where it was entered, |
| /// and it will attempt to exit the span on a thread that may never have entered |
| /// it. However, we still want them to be `Sync` so that a struct holding an |
| /// `Entered` guard can be `Sync`. |
| /// |
| /// Thus, this is totally safe. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>PhantomNotSend { |
| ghost: PhantomData<<span class="kw-2">*mut </span>()>, |
| } |
| |
| <span class="attribute">#[allow(non_upper_case_globals)] |
| </span><span class="kw">const </span>PhantomNotSend: PhantomNotSend = PhantomNotSend { ghost: PhantomData }; |
| |
| <span class="doccomment">/// # Safety |
| /// |
| /// Trivially safe, as `PhantomNotSend` doesn't have any API. |
| </span><span class="kw">unsafe impl </span>Sync <span class="kw">for </span>PhantomNotSend {} |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>test { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">trait </span>AssertSend: Send {} |
| <span class="kw">impl </span>AssertSend <span class="kw">for </span>Span {} |
| |
| <span class="kw">trait </span>AssertSync: Sync {} |
| <span class="kw">impl </span>AssertSync <span class="kw">for </span>Span {} |
| <span class="kw">impl </span>AssertSync <span class="kw">for </span>Entered<<span class="lifetime">'_</span>> {} |
| <span class="kw">impl </span>AssertSync <span class="kw">for </span>EnteredSpan {} |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_record_backwards_compat() { |
| Span::current().record(<span class="string">"some-key"</span>, <span class="kw-2">&</span><span class="string">"some text"</span>); |
| Span::current().record(<span class="string">"some-key"</span>, <span class="kw-2">&</span><span class="bool-val">false</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="tracing" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |