| <!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 `common/rusty_leveldb_sgx/src/mem_env.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mem_env.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="../../rusty_leveldb/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../rusty_leveldb/index.html"><img class="rust-logo" src="../../rust-logo.svg" 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> |
| </pre><pre class="rust"><code><span class="doccomment">//! An in-memory implementation of Env. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::env::{path_to_str, path_to_string, Env, FileLock, Logger, RandomAccess}; |
| <span class="kw">use </span><span class="kw">crate</span>::env_common::micros; |
| <span class="kw">use </span><span class="kw">crate</span>::error::{err, <span class="prelude-ty">Result</span>, StatusCode}; |
| |
| <span class="kw">use </span>std::collections::hash_map::Entry; |
| <span class="kw">use </span>std::collections::HashMap; |
| <span class="kw">use </span>std::io::{<span class="self">self</span>, Read, Write}; |
| <span class="kw">use </span>std::ops::Deref; |
| <span class="kw">use </span>std::path::{Path, PathBuf}; |
| |
| <span class="kw">use </span>std::sync::{Arc, Mutex}; |
| |
| <span class="doccomment">/// BufferBackedFile is a simple type implementing RandomAccess on a Vec<u8>. |
| </span><span class="kw">pub type </span>BufferBackedFile = Vec<u8>; |
| |
| <span class="kw">impl </span>RandomAccess <span class="kw">for </span>BufferBackedFile { |
| <span class="kw">fn </span>read_at(<span class="kw-2">&</span><span class="self">self</span>, off: usize, dst: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">if </span>off > <span class="self">self</span>.len() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| } |
| <span class="kw">let </span>remaining = <span class="self">self</span>.len() - off; |
| <span class="kw">let </span>to_read = <span class="kw">if </span>dst.len() > remaining { |
| remaining |
| } <span class="kw">else </span>{ |
| dst.len() |
| }; |
| (<span class="kw-2">&mut </span>dst[<span class="number">0</span>..to_read]).copy_from_slice(<span class="kw-2">&</span><span class="self">self</span>[off..off + to_read]); |
| <span class="prelude-val">Ok</span>(to_read) |
| } |
| } |
| |
| <span class="doccomment">/// A MemFile holds a shared, concurrency-safe buffer. It can be shared among several |
| /// MemFileReaders and MemFileWriters, each with an independent offset. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>MemFile(Arc<Mutex<BufferBackedFile>>); |
| |
| <span class="kw">impl </span>MemFile { |
| <span class="kw">fn </span>new() -> MemFile { |
| MemFile(Arc::new(Mutex::new(Vec::new()))) |
| } |
| } |
| |
| <span class="doccomment">/// A MemFileReader holds a reference to a MemFile and a read offset. |
| </span><span class="kw">struct </span>MemFileReader(MemFile, usize); |
| |
| <span class="kw">impl </span>MemFileReader { |
| <span class="kw">fn </span>new(f: MemFile, from: usize) -> MemFileReader { |
| MemFileReader(f, from) |
| } |
| } |
| |
| <span class="comment">// We need Read/Write/Seek implementations for our MemFile in order to work well with the |
| // concurrency requirements. It's very hard or even impossible to implement those traits just by |
| // wrapping MemFile in other types. |
| </span><span class="kw">impl </span>Read <span class="kw">for </span>MemFileReader { |
| <span class="kw">fn </span>read(<span class="kw-2">&mut </span><span class="self">self</span>, dst: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="kw">let </span>buf = (<span class="self">self</span>.<span class="number">0</span>).<span class="number">0</span>.lock().unwrap(); |
| <span class="kw">if </span><span class="self">self</span>.<span class="number">1 </span>>= buf.len() { |
| <span class="comment">// EOF |
| </span><span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| } |
| <span class="kw">let </span>remaining = buf.len() - <span class="self">self</span>.<span class="number">1</span>; |
| <span class="kw">let </span>to_read = <span class="kw">if </span>dst.len() > remaining { |
| remaining |
| } <span class="kw">else </span>{ |
| dst.len() |
| }; |
| |
| (<span class="kw-2">&mut </span>dst[<span class="number">0</span>..to_read]).copy_from_slice(<span class="kw-2">&</span>buf[<span class="self">self</span>.<span class="number">1</span>..<span class="self">self</span>.<span class="number">1 </span>+ to_read]); |
| <span class="self">self</span>.<span class="number">1 </span>+= to_read; |
| <span class="prelude-val">Ok</span>(to_read) |
| } |
| } |
| |
| <span class="doccomment">/// A MemFileWriter holds a reference to a MemFile and a write offset. |
| </span><span class="kw">struct </span>MemFileWriter(MemFile, usize); |
| |
| <span class="kw">impl </span>MemFileWriter { |
| <span class="kw">fn </span>new(f: MemFile, append: bool) -> MemFileWriter { |
| <span class="kw">let </span>len = f.<span class="number">0</span>.lock().unwrap().len(); |
| MemFileWriter(f, <span class="kw">if </span>append { len } <span class="kw">else </span>{ <span class="number">0 </span>}) |
| } |
| } |
| |
| <span class="kw">impl </span>Write <span class="kw">for </span>MemFileWriter { |
| <span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, src: <span class="kw-2">&</span>[u8]) -> io::Result<usize> { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = (<span class="self">self</span>.<span class="number">0</span>).<span class="number">0</span>.lock().unwrap(); |
| <span class="comment">// Write is append. |
| </span><span class="kw">if </span><span class="self">self</span>.<span class="number">1 </span>== buf.len() { |
| buf.extend_from_slice(src); |
| } <span class="kw">else </span>{ |
| <span class="comment">// Write in the middle, possibly appending. |
| </span><span class="kw">let </span>remaining = buf.len() - <span class="self">self</span>.<span class="number">1</span>; |
| <span class="kw">if </span>src.len() <= remaining { |
| <span class="comment">// src fits into buffer. |
| </span>(<span class="kw-2">&mut </span>buf[<span class="self">self</span>.<span class="number">1</span>..<span class="self">self</span>.<span class="number">1 </span>+ src.len()]).copy_from_slice(src); |
| } <span class="kw">else </span>{ |
| <span class="comment">// src doesn't fit; first copy what fits, then append the rest/ |
| </span>(<span class="kw-2">&mut </span>buf[<span class="self">self</span>.<span class="number">1</span>..<span class="self">self</span>.<span class="number">1 </span>+ remaining]).copy_from_slice(<span class="kw-2">&</span>src[<span class="number">0</span>..remaining]); |
| buf.extend_from_slice(<span class="kw-2">&</span>src[remaining..src.len()]); |
| } |
| } |
| <span class="self">self</span>.<span class="number">1 </span>+= src.len(); |
| <span class="prelude-val">Ok</span>(src.len()) |
| } |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>RandomAccess <span class="kw">for </span>MemFile { |
| <span class="kw">fn </span>read_at(<span class="kw-2">&</span><span class="self">self</span>, off: usize, dst: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">let </span>guard = <span class="self">self</span>.<span class="number">0</span>.lock().unwrap(); |
| <span class="kw">let </span>buf: <span class="kw-2">&</span>BufferBackedFile = guard.deref(); |
| buf.read_at(off, dst) |
| } |
| } |
| |
| <span class="kw">struct </span>MemFSEntry { |
| f: MemFile, |
| locked: bool, |
| } |
| |
| <span class="doccomment">/// MemFS implements a completely in-memory file system, both for testing and temporary in-memory |
| /// databases. It supports full concurrency. |
| </span><span class="kw">pub struct </span>MemFS { |
| store: Arc<Mutex<HashMap<String, MemFSEntry>>>, |
| } |
| |
| <span class="kw">impl </span>MemFS { |
| <span class="kw">fn </span>new() -> MemFS { |
| MemFS { |
| store: Arc::new(Mutex::new(HashMap::new())), |
| } |
| } |
| |
| <span class="doccomment">/// Open a file. The caller can use the MemFile either inside a MemFileReader or as |
| /// RandomAccess. |
| </span><span class="kw">fn </span>open(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path, create: bool) -> <span class="prelude-ty">Result</span><MemFile> { |
| <span class="kw">let </span><span class="kw-2">mut </span>fs = <span class="self">self</span>.store.lock().unwrap(); |
| <span class="kw">match </span>fs.entry(path_to_string(p)) { |
| Entry::Occupied(o) => <span class="prelude-val">Ok</span>(o.get().f.clone()), |
| Entry::Vacant(v) => { |
| <span class="kw">if </span>!create { |
| <span class="kw">return </span>err( |
| StatusCode::NotFound, |
| <span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"open: file not found: {}"</span>, path_to_str(p)), |
| ); |
| } |
| <span class="kw">let </span>f = MemFile::new(); |
| v.insert(MemFSEntry { |
| f: f.clone(), |
| locked: <span class="bool-val">false</span>, |
| }); |
| <span class="prelude-val">Ok</span>(f) |
| } |
| } |
| } |
| <span class="doccomment">/// Open a file for writing. |
| </span><span class="kw">fn </span>open_w(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path, append: bool, truncate: bool) -> <span class="prelude-ty">Result</span><Box<<span class="kw">dyn </span>Write>> { |
| <span class="kw">let </span>f = <span class="self">self</span>.open(p, <span class="bool-val">true</span>)<span class="question-mark">?</span>; |
| <span class="kw">if </span>truncate { |
| f.<span class="number">0</span>.lock().unwrap().clear(); |
| } |
| <span class="prelude-val">Ok</span>(Box::new(MemFileWriter::new(f, append))) |
| } |
| <span class="kw">fn </span>exists_(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><bool> { |
| <span class="kw">let </span>fs = <span class="self">self</span>.store.lock()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(fs.contains_key(path_to_str(p))) |
| } |
| <span class="kw">fn </span>children_of(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Vec<PathBuf>> { |
| <span class="kw">let </span>fs = <span class="self">self</span>.store.lock()<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>prefix = path_to_string(p); |
| <span class="kw">let </span>main_separator_str = std::path::MAIN_SEPARATOR.to_string(); |
| <span class="kw">if </span>!prefix.ends_with(<span class="kw-2">&</span>main_separator_str) { |
| prefix.push(std::path::MAIN_SEPARATOR); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>children = Vec::new(); |
| <span class="kw">for </span>k <span class="kw">in </span>fs.keys() { |
| <span class="kw">if </span>k.starts_with(<span class="kw-2">&</span>prefix) { |
| children.push(Path::new(k.strip_prefix(<span class="kw-2">&</span>prefix).unwrap_or(<span class="kw-2">&</span>k)).to_owned()); |
| } |
| } |
| <span class="prelude-val">Ok</span>(children) |
| } |
| <span class="kw">fn </span>size_of_(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">let </span><span class="kw-2">mut </span>fs = <span class="self">self</span>.store.lock()<span class="question-mark">?</span>; |
| <span class="kw">match </span>fs.entry(path_to_string(p)) { |
| Entry::Occupied(o) => <span class="prelude-val">Ok</span>(o.get().f.<span class="number">0</span>.lock()<span class="question-mark">?</span>.len()), |
| <span class="kw">_ </span>=> err( |
| StatusCode::NotFound, |
| <span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"size_of: file not found: {}"</span>, path_to_str(p)), |
| ), |
| } |
| } |
| <span class="kw">fn </span>delete_(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>fs = <span class="self">self</span>.store.lock()<span class="question-mark">?</span>; |
| <span class="kw">match </span>fs.entry(path_to_string(p)) { |
| Entry::Occupied(o) => { |
| o.remove_entry(); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="kw">_ </span>=> err( |
| StatusCode::NotFound, |
| <span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"delete: file not found: {}"</span>, path_to_str(p)), |
| ), |
| } |
| } |
| <span class="kw">fn </span>rename_(<span class="kw-2">&</span><span class="self">self</span>, from: <span class="kw-2">&</span>Path, to: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>fs = <span class="self">self</span>.store.lock()<span class="question-mark">?</span>; |
| <span class="kw">match </span>fs.remove(path_to_str(from)) { |
| <span class="prelude-val">Some</span>(v) => { |
| fs.insert(path_to_string(to), v); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="kw">_ </span>=> err( |
| StatusCode::NotFound, |
| <span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"rename: file not found: {}"</span>, path_to_str(from)), |
| ), |
| } |
| } |
| <span class="kw">fn </span>lock_(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><FileLock> { |
| <span class="kw">let </span><span class="kw-2">mut </span>fs = <span class="self">self</span>.store.lock()<span class="question-mark">?</span>; |
| <span class="kw">match </span>fs.entry(path_to_string(p)) { |
| Entry::Occupied(<span class="kw-2">mut </span>o) => { |
| <span class="kw">if </span>o.get().locked { |
| err( |
| StatusCode::LockError, |
| <span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"already locked: {}"</span>, path_to_str(p)), |
| ) |
| } <span class="kw">else </span>{ |
| o.get_mut().locked = <span class="bool-val">true</span>; |
| <span class="prelude-val">Ok</span>(FileLock { |
| id: path_to_string(p), |
| }) |
| } |
| } |
| Entry::Vacant(v) => { |
| <span class="kw">let </span>f = MemFile::new(); |
| v.insert(MemFSEntry { |
| f: f.clone(), |
| locked: <span class="bool-val">true</span>, |
| }); |
| <span class="prelude-val">Ok</span>(FileLock { |
| id: path_to_string(p), |
| }) |
| } |
| } |
| } |
| <span class="kw">fn </span>unlock_(<span class="kw-2">&</span><span class="self">self</span>, l: FileLock) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>fs = <span class="self">self</span>.store.lock()<span class="question-mark">?</span>; |
| <span class="kw">let </span>id = l.id.clone(); |
| <span class="kw">match </span>fs.entry(l.id) { |
| Entry::Occupied(<span class="kw-2">mut </span>o) => { |
| <span class="kw">if </span>!o.get().locked { |
| err( |
| StatusCode::LockError, |
| <span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"unlocking unlocked file: {}"</span>, id), |
| ) |
| } <span class="kw">else </span>{ |
| o.get_mut().locked = <span class="bool-val">false</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| <span class="kw">_ </span>=> err( |
| StatusCode::NotFound, |
| <span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"unlock: file not found: {}"</span>, id), |
| ), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// MemEnv is an in-memory environment that can be used for testing or ephemeral databases. The |
| /// performance will be better than what a disk environment delivers. |
| </span><span class="kw">pub struct </span>MemEnv(MemFS); |
| |
| <span class="kw">impl </span>MemEnv { |
| <span class="kw">pub fn </span>new() -> MemEnv { |
| MemEnv(MemFS::new()) |
| } |
| } |
| |
| <span class="kw">impl </span>Env <span class="kw">for </span>MemEnv { |
| <span class="kw">fn </span>open_sequential_file(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Box<<span class="kw">dyn </span>Read>> { |
| <span class="kw">let </span>f = <span class="self">self</span>.<span class="number">0</span>.open(p, <span class="bool-val">false</span>)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Box::new(MemFileReader::new(f, <span class="number">0</span>))) |
| } |
| <span class="kw">fn </span>open_random_access_file(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Box<<span class="kw">dyn </span>RandomAccess>> { |
| <span class="self">self</span>.<span class="number">0 |
| </span>.open(p, <span class="bool-val">false</span>) |
| .map(|m| Box::new(m) <span class="kw">as </span>Box<<span class="kw">dyn </span>RandomAccess>) |
| } |
| <span class="kw">fn </span>open_writable_file(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Box<<span class="kw">dyn </span>Write>> { |
| <span class="self">self</span>.<span class="number">0</span>.open_w(p, <span class="bool-val">true</span>, <span class="bool-val">true</span>) |
| } |
| <span class="kw">fn </span>open_appendable_file(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Box<<span class="kw">dyn </span>Write>> { |
| <span class="self">self</span>.<span class="number">0</span>.open_w(p, <span class="bool-val">true</span>, <span class="bool-val">false</span>) |
| } |
| |
| <span class="kw">fn </span>exists(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><bool> { |
| <span class="self">self</span>.<span class="number">0</span>.exists_(p) |
| } |
| <span class="kw">fn </span>children(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Vec<PathBuf>> { |
| <span class="self">self</span>.<span class="number">0</span>.children_of(p) |
| } |
| <span class="kw">fn </span>size_of(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="self">self</span>.<span class="number">0</span>.size_of_(p) |
| } |
| |
| <span class="kw">fn </span>delete(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.<span class="number">0</span>.delete_(p) |
| } |
| <span class="kw">fn </span>mkdir(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">if </span><span class="self">self</span>.exists(p)<span class="question-mark">? </span>{ |
| err(StatusCode::AlreadyExists, <span class="string">""</span>) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| <span class="kw">fn </span>rmdir(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">if </span>!<span class="self">self</span>.exists(p)<span class="question-mark">? </span>{ |
| err(StatusCode::NotFound, <span class="string">""</span>) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| <span class="kw">fn </span>rename(<span class="kw-2">&</span><span class="self">self</span>, old: <span class="kw-2">&</span>Path, new: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.<span class="number">0</span>.rename_(old, new) |
| } |
| |
| <span class="kw">fn </span>lock(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><FileLock> { |
| <span class="self">self</span>.<span class="number">0</span>.lock_(p) |
| } |
| <span class="kw">fn </span>unlock(<span class="kw-2">&</span><span class="self">self</span>, p: FileLock) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.<span class="number">0</span>.unlock_(p) |
| } |
| |
| <span class="kw">fn </span>micros(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| micros() |
| } |
| |
| <span class="kw">fn </span>new_logger(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Logger> { |
| <span class="self">self</span>.open_appendable_file(p) |
| .map(|dst| Logger::new(Box::new(dst))) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"enclave_unit_test"</span>)] |
| </span><span class="kw">pub mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::env; |
| <span class="kw">use </span>teaclave_test_utils::<span class="kw-2">*</span>; |
| |
| <span class="kw">pub fn </span>run_tests() -> bool { |
| <span class="macro">run_tests!</span>( |
| test_mem_fs_memfile_read, |
| test_mem_fs_memfile_write, |
| test_mem_fs_memfile_readat, |
| test_mem_fs_open_read_write, |
| test_mem_fs_open_read_write_append_truncate, |
| test_mem_fs_metadata_operations, |
| test_mem_fs_children, |
| test_mem_fs_lock, |
| test_memenv_all, |
| ) |
| } |
| |
| <span class="kw">fn </span>new_memfile(v: Vec<u8>) -> MemFile { |
| MemFile(Arc::new(Mutex::new(v))) |
| } |
| |
| <span class="kw">fn </span>test_mem_fs_memfile_read() { |
| <span class="kw">let </span>f = new_memfile(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>]); |
| <span class="kw">let </span><span class="kw-2">mut </span>buf: [u8; <span class="number">1</span>] = [<span class="number">0</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>reader = MemFileReader(f, <span class="number">0</span>); |
| |
| <span class="kw">for </span>i <span class="kw">in </span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>].iter() { |
| <span class="macro">assert_eq!</span>(reader.read(<span class="kw-2">&mut </span>buf).unwrap(), <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(buf, [<span class="kw-2">*</span>i]); |
| } |
| } |
| |
| <span class="kw">fn </span>test_mem_fs_memfile_write() { |
| <span class="kw">let </span>f = new_memfile(<span class="macro">vec!</span>[]); |
| <span class="kw">let </span><span class="kw-2">mut </span>w1 = MemFileWriter::new(f.clone(), <span class="bool-val">false</span>); |
| <span class="macro">assert_eq!</span>(w1.write(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]).unwrap(), <span class="number">3</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>w2 = MemFileWriter::new(f, <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(w1.write(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>]).unwrap(), <span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(w2.write(<span class="kw-2">&</span>[<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]).unwrap(), <span class="number">3</span>); |
| |
| <span class="macro">assert_eq!</span>( |
| (w1.<span class="number">0</span>).<span class="number">0</span>.lock().unwrap().as_ref() <span class="kw">as </span><span class="kw-2">&</span>Vec<u8>, |
| <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">9</span>] |
| ); |
| } |
| |
| <span class="kw">fn </span>test_mem_fs_memfile_readat() { |
| <span class="kw">let </span>f = new_memfile(<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">3</span>]; |
| <span class="macro">assert_eq!</span>(f.read_at(<span class="number">2</span>, <span class="kw-2">&mut </span>buf).unwrap(), <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(buf, [<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]); |
| |
| <span class="macro">assert_eq!</span>(f.read_at(<span class="number">0</span>, <span class="kw-2">&mut </span>buf[<span class="number">0</span>..<span class="number">1</span>]).unwrap(), <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(buf, [<span class="number">1</span>, <span class="number">4</span>, <span class="number">5</span>]); |
| |
| <span class="macro">assert_eq!</span>(f.read_at(<span class="number">5</span>, <span class="kw-2">&mut </span>buf).unwrap(), <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(buf, [<span class="number">1</span>, <span class="number">4</span>, <span class="number">5</span>]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf2 = [<span class="number">0</span>; <span class="number">6</span>]; |
| <span class="macro">assert_eq!</span>(f.read_at(<span class="number">0</span>, <span class="kw-2">&mut </span>buf2[<span class="number">0</span>..<span class="number">5</span>]).unwrap(), <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(buf2, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">0</span>]); |
| <span class="macro">assert_eq!</span>(f.read_at(<span class="number">0</span>, <span class="kw-2">&mut </span>buf2[<span class="number">0</span>..<span class="number">6</span>]).unwrap(), <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(buf2, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">0</span>]); |
| } |
| |
| <span class="kw">fn </span>test_mem_fs_open_read_write() { |
| <span class="kw">let </span>fs = MemFS::new(); |
| <span class="kw">let </span>path = Path::new(<span class="string">"/a/b/hello.txt"</span>); |
| |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>w = fs.open_w(<span class="kw-2">&</span>path, <span class="bool-val">false</span>, <span class="bool-val">false</span>).unwrap(); |
| <span class="macro">write!</span>(w, <span class="string">"Hello"</span>).unwrap(); |
| <span class="comment">// Append. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>w2 = fs.open_w(<span class="kw-2">&</span>path, <span class="bool-val">true</span>, <span class="bool-val">false</span>).unwrap(); |
| <span class="macro">write!</span>(w2, <span class="string">"World"</span>).unwrap(); |
| } |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>r = MemFileReader::new(fs.open(<span class="kw-2">&</span>path, <span class="bool-val">false</span>).unwrap(), <span class="number">0</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>s = String::new(); |
| <span class="macro">assert_eq!</span>(r.read_to_string(<span class="kw-2">&mut </span>s).unwrap(), <span class="number">10</span>); |
| <span class="macro">assert_eq!</span>(s, <span class="string">"HelloWorld"</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r2 = MemFileReader::new(fs.open(<span class="kw-2">&</span>path, <span class="bool-val">false</span>).unwrap(), <span class="number">2</span>); |
| s.clear(); |
| <span class="macro">assert_eq!</span>(r2.read_to_string(<span class="kw-2">&mut </span>s).unwrap(), <span class="number">8</span>); |
| <span class="macro">assert_eq!</span>(s, <span class="string">"lloWorld"</span>); |
| } |
| <span class="macro">assert_eq!</span>(fs.size_of_(<span class="kw-2">&</span>path).unwrap(), <span class="number">10</span>); |
| <span class="macro">assert!</span>(fs.exists_(<span class="kw-2">&</span>path).unwrap()); |
| <span class="macro">assert!</span>(!fs.exists_(<span class="kw-2">&</span>Path::new(<span class="string">"/non/existing/path"</span>)).unwrap()); |
| } |
| |
| <span class="kw">fn </span>test_mem_fs_open_read_write_append_truncate() { |
| <span class="kw">let </span>fs = MemFS::new(); |
| <span class="kw">let </span>path = Path::new(<span class="string">"/a/b/hello.txt"</span>); |
| |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>w0 = fs.open_w(<span class="kw-2">&</span>path, <span class="bool-val">false</span>, <span class="bool-val">true</span>).unwrap(); |
| <span class="macro">write!</span>(w0, <span class="string">"Garbage"</span>).unwrap(); |
| |
| <span class="comment">// Truncate. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>w = fs.open_w(<span class="kw-2">&</span>path, <span class="bool-val">false</span>, <span class="bool-val">true</span>).unwrap(); |
| <span class="macro">write!</span>(w, <span class="string">"Xyz"</span>).unwrap(); |
| <span class="comment">// Write to the beginning. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>w2 = fs.open_w(<span class="kw-2">&</span>path, <span class="bool-val">false</span>, <span class="bool-val">false</span>).unwrap(); |
| <span class="macro">write!</span>(w2, <span class="string">"OverwritingEverythingWithGarbage"</span>).unwrap(); |
| <span class="comment">// Overwrite the overwritten stuff. |
| </span><span class="macro">write!</span>(w, <span class="string">"Xyz"</span>).unwrap(); |
| <span class="macro">assert!</span>(w.flush().is_ok()); |
| } |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>r = MemFileReader::new(fs.open(<span class="kw-2">&</span>path, <span class="bool-val">false</span>).unwrap(), <span class="number">0</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>s = String::new(); |
| <span class="macro">assert_eq!</span>(r.read_to_string(<span class="kw-2">&mut </span>s).unwrap(), <span class="number">32</span>); |
| <span class="macro">assert_eq!</span>(s, <span class="string">"OveXyzitingEverythingWithGarbage"</span>); |
| } |
| <span class="macro">assert!</span>(fs.exists_(<span class="kw-2">&</span>path).unwrap()); |
| <span class="macro">assert_eq!</span>(fs.size_of_(<span class="kw-2">&</span>path).unwrap(), <span class="number">32</span>); |
| <span class="macro">assert!</span>(!fs.exists_(<span class="kw-2">&</span>Path::new(<span class="string">"/non/existing/path"</span>)).unwrap()); |
| } |
| |
| <span class="kw">fn </span>test_mem_fs_metadata_operations() { |
| <span class="kw">let </span>fs = MemFS::new(); |
| <span class="kw">let </span>path = Path::new(<span class="string">"/a/b/hello.file"</span>); |
| <span class="kw">let </span>newpath = Path::new(<span class="string">"/a/b/hello2.file"</span>); |
| <span class="kw">let </span>nonexist = Path::new(<span class="string">"/blah"</span>); |
| |
| <span class="comment">// Make file/remove file. |
| </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>w = fs.open_w(<span class="kw-2">&</span>path, <span class="bool-val">false</span>, <span class="bool-val">false</span>).unwrap(); |
| <span class="macro">write!</span>(w, <span class="string">"Hello"</span>).unwrap(); |
| } |
| <span class="macro">assert!</span>(fs.exists_(<span class="kw-2">&</span>path).unwrap()); |
| <span class="macro">assert_eq!</span>(fs.size_of_(<span class="kw-2">&</span>path).unwrap(), <span class="number">5</span>); |
| fs.delete_(<span class="kw-2">&</span>path).unwrap(); |
| <span class="macro">assert!</span>(!fs.exists_(<span class="kw-2">&</span>path).unwrap()); |
| <span class="macro">assert!</span>(fs.delete_(<span class="kw-2">&</span>nonexist).is_err()); |
| |
| <span class="comment">// rename_ file. |
| </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>w = fs.open_w(<span class="kw-2">&</span>path, <span class="bool-val">false</span>, <span class="bool-val">false</span>).unwrap(); |
| <span class="macro">write!</span>(w, <span class="string">"Hello"</span>).unwrap(); |
| } |
| <span class="macro">assert!</span>(fs.exists_(<span class="kw-2">&</span>path).unwrap()); |
| <span class="macro">assert!</span>(!fs.exists_(<span class="kw-2">&</span>newpath).unwrap()); |
| <span class="macro">assert_eq!</span>(fs.size_of_(<span class="kw-2">&</span>path).unwrap(), <span class="number">5</span>); |
| <span class="macro">assert!</span>(fs.size_of_(<span class="kw-2">&</span>newpath).is_err()); |
| |
| fs.rename_(<span class="kw-2">&</span>path, <span class="kw-2">&</span>newpath).unwrap(); |
| |
| <span class="macro">assert!</span>(!fs.exists_(<span class="kw-2">&</span>path).unwrap()); |
| <span class="macro">assert!</span>(fs.exists_(<span class="kw-2">&</span>newpath).unwrap()); |
| <span class="macro">assert_eq!</span>(fs.size_of_(<span class="kw-2">&</span>newpath).unwrap(), <span class="number">5</span>); |
| <span class="macro">assert!</span>(fs.size_of_(<span class="kw-2">&</span>path).is_err()); |
| |
| <span class="macro">assert!</span>(fs.rename_(<span class="kw-2">&</span>nonexist, <span class="kw-2">&</span>path).is_err()); |
| } |
| |
| <span class="kw">fn </span>s2p(x: <span class="kw-2">&</span>str) -> PathBuf { |
| Path::new(x).to_owned() |
| } |
| |
| <span class="kw">fn </span>test_mem_fs_children() { |
| <span class="kw">let </span>fs = MemFS::new(); |
| <span class="kw">let </span>(path1, path2, path3) = ( |
| Path::new(<span class="string">"/a/1.txt"</span>), |
| Path::new(<span class="string">"/a/2.txt"</span>), |
| Path::new(<span class="string">"/b/1.txt"</span>), |
| ); |
| |
| <span class="kw">for </span>p <span class="kw">in </span><span class="kw-2">&</span>[<span class="kw-2">&</span>path1, <span class="kw-2">&</span>path2, <span class="kw-2">&</span>path3] { |
| fs.open_w(<span class="kw-2">*</span>p, <span class="bool-val">false</span>, <span class="bool-val">false</span>).unwrap(); |
| } |
| <span class="kw">let </span>children = fs.children_of(<span class="kw-2">&</span>Path::new(<span class="string">"/a"</span>)).unwrap(); |
| <span class="macro">assert!</span>( |
| (children == <span class="macro">vec!</span>[s2p(<span class="string">"1.txt"</span>), s2p(<span class="string">"2.txt"</span>)]) |
| || (children == <span class="macro">vec!</span>[s2p(<span class="string">"2.txt"</span>), s2p(<span class="string">"1.txt"</span>)]) |
| ); |
| <span class="kw">let </span>children = fs.children_of(<span class="kw-2">&</span>Path::new(<span class="string">"/a/"</span>)).unwrap(); |
| <span class="macro">assert!</span>( |
| (children == <span class="macro">vec!</span>[s2p(<span class="string">"1.txt"</span>), s2p(<span class="string">"2.txt"</span>)]) |
| || (children == <span class="macro">vec!</span>[s2p(<span class="string">"2.txt"</span>), s2p(<span class="string">"1.txt"</span>)]) |
| ); |
| } |
| |
| <span class="kw">fn </span>test_mem_fs_lock() { |
| <span class="kw">let </span>fs = MemFS::new(); |
| <span class="kw">let </span>p = Path::new(<span class="string">"/a/lock"</span>); |
| |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>f = fs.open_w(p, <span class="bool-val">true</span>, <span class="bool-val">true</span>).unwrap(); |
| f.write(<span class="string">"abcdef"</span>.as_bytes()).expect(<span class="string">"write failed"</span>); |
| } |
| |
| <span class="comment">// Locking on new file. |
| </span><span class="kw">let </span>lock = fs.lock_(p).unwrap(); |
| <span class="macro">assert!</span>(fs.lock_(p).is_err()); |
| |
| <span class="comment">// Unlock of locked file is ok. |
| </span><span class="macro">assert!</span>(fs.unlock_(lock).is_ok()); |
| |
| <span class="comment">// Lock of unlocked file is ok. |
| </span><span class="kw">let </span>lock = fs.lock_(p).unwrap(); |
| <span class="macro">assert!</span>(fs.lock_(p).is_err()); |
| <span class="macro">assert!</span>(fs.unlock_(lock).is_ok()); |
| |
| <span class="comment">// Rogue operation. |
| </span><span class="macro">assert!</span>(fs |
| .unlock_(env::FileLock { |
| id: <span class="string">"/a/lock"</span>.to_string(), |
| }) |
| .is_err()); |
| |
| <span class="comment">// Non-existent files. |
| </span><span class="kw">let </span>p2 = Path::new(<span class="string">"/a/lock2"</span>); |
| <span class="macro">assert!</span>(fs.lock_(p2).is_ok()); |
| <span class="macro">assert!</span>(fs |
| .unlock_(env::FileLock { |
| id: <span class="string">"/a/lock2"</span>.to_string(), |
| }) |
| .is_ok()); |
| } |
| |
| <span class="kw">fn </span>test_memenv_all() { |
| <span class="kw">let </span>me = MemEnv::new(); |
| <span class="kw">let </span>(p1, p2, p3) = (Path::new(<span class="string">"/a/b"</span>), Path::new(<span class="string">"/a/c"</span>), Path::new(<span class="string">"/a/d"</span>)); |
| <span class="kw">let </span>nonexist = Path::new(<span class="string">"/x/y"</span>); |
| me.open_writable_file(p2).unwrap(); |
| me.open_appendable_file(p3).unwrap(); |
| me.open_sequential_file(p2).unwrap(); |
| me.open_random_access_file(p3).unwrap(); |
| |
| <span class="macro">assert!</span>(me.exists(p2).unwrap()); |
| <span class="macro">assert_eq!</span>(me.children(Path::new(<span class="string">"/a/"</span>)).unwrap().len(), <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(me.size_of(p2).unwrap(), <span class="number">0</span>); |
| |
| me.delete(p2).unwrap(); |
| <span class="macro">assert!</span>(me.mkdir(p3).is_err()); |
| me.mkdir(p1).unwrap(); |
| me.rmdir(p3).unwrap(); |
| <span class="macro">assert!</span>(me.rmdir(nonexist).is_err()); |
| |
| me.open_writable_file(p1).unwrap(); |
| me.rename(p1, p3).unwrap(); |
| <span class="macro">assert!</span>(!me.exists(p1).unwrap()); |
| <span class="macro">assert!</span>(me.rename(nonexist, p1).is_err()); |
| |
| me.unlock(me.lock(p3).unwrap()).unwrap(); |
| <span class="macro">assert!</span>(me.lock(nonexist).is_ok()); |
| |
| me.new_logger(p1).unwrap(); |
| <span class="macro">assert!</span>(me.micros() > <span class="number">0</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rusty_leveldb" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
