| <!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 `src/raw/adapters/kv/backend.rs`."><title>backend.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../../static.files/rustdoc-916cea96.css"><meta name="rustdoc-vars" data-root-path="../../../../../" data-static-root-path="../../../../../static.files/" data-current-crate="opendal" data-themes="" data-resource-suffix="" data-rustdoc-version="1.87.0-nightly (43a2e9d2c 2025-03-17)" data-channel="nightly" data-search-js="search-e7298875.js" data-settings-js="settings-d72f25bb.js" ><script src="../../../../../static.files/storage-d8ac8691.js"></script><script defer src="../../../../../static.files/src-script-b8d3f215.js"></script><script defer src="../../../../../src-files.js"></script><script defer src="../../../../../static.files/main-fb8c74a8.js"></script><noscript><link rel="stylesheet" href="../../../../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">opendal/raw/adapters/kv/</div>backend.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="comment">// Licensed to the Apache Software Foundation (ASF) under one |
| <a href=#2 id=2 data-nosnippet>2</a>// or more contributor license agreements. See the NOTICE file |
| <a href=#3 id=3 data-nosnippet>3</a>// distributed with this work for additional information |
| <a href=#4 id=4 data-nosnippet>4</a>// regarding copyright ownership. The ASF licenses this file |
| <a href=#5 id=5 data-nosnippet>5</a>// to you under the Apache License, Version 2.0 (the |
| <a href=#6 id=6 data-nosnippet>6</a>// "License"); you may not use this file except in compliance |
| <a href=#7 id=7 data-nosnippet>7</a>// with the License. You may obtain a copy of the License at |
| <a href=#8 id=8 data-nosnippet>8</a>// |
| <a href=#9 id=9 data-nosnippet>9</a>// http://www.apache.org/licenses/LICENSE-2.0 |
| <a href=#10 id=10 data-nosnippet>10</a>// |
| <a href=#11 id=11 data-nosnippet>11</a>// Unless required by applicable law or agreed to in writing, |
| <a href=#12 id=12 data-nosnippet>12</a>// software distributed under the License is distributed on an |
| <a href=#13 id=13 data-nosnippet>13</a>// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| <a href=#14 id=14 data-nosnippet>14</a>// KIND, either express or implied. See the License for the |
| <a href=#15 id=15 data-nosnippet>15</a>// specific language governing permissions and limitations |
| <a href=#16 id=16 data-nosnippet>16</a>// under the License. |
| <a href=#17 id=17 data-nosnippet>17</a> |
| <a href=#18 id=18 data-nosnippet>18</a></span><span class="kw">use </span>std::sync::Arc; |
| <a href=#19 id=19 data-nosnippet>19</a> |
| <a href=#20 id=20 data-nosnippet>20</a><span class="kw">use super</span>::{Adapter, Scan}; |
| <a href=#21 id=21 data-nosnippet>21</a><span class="kw">use </span><span class="kw">crate</span>::raw::oio::HierarchyLister; |
| <a href=#22 id=22 data-nosnippet>22</a><span class="kw">use </span><span class="kw">crate</span>::raw::oio::QueueBuf; |
| <a href=#23 id=23 data-nosnippet>23</a><span class="kw">use </span><span class="kw">crate</span>::raw::<span class="kw-2">*</span>; |
| <a href=#24 id=24 data-nosnippet>24</a><span class="kw">use crate</span>::<span class="kw-2">*</span>; |
| <a href=#25 id=25 data-nosnippet>25</a> |
| <a href=#26 id=26 data-nosnippet>26</a><span class="doccomment">/// Backend of kv service. If the storage service is one k-v-like service, it should implement this kv [`Backend`] by right. |
| <a href=#27 id=27 data-nosnippet>27</a>/// |
| <a href=#28 id=28 data-nosnippet>28</a>/// `Backend` implements one general logic on how to read, write, scan the data from one kv store efficiently. |
| <a href=#29 id=29 data-nosnippet>29</a>/// And the [`Adapter`] held by `Backend` will handle how to communicate with one k-v-like service really and provides |
| <a href=#30 id=30 data-nosnippet>30</a>/// a series of basic operation for this service. |
| <a href=#31 id=31 data-nosnippet>31</a>/// |
| <a href=#32 id=32 data-nosnippet>32</a>/// OpenDAL developer can implement one new k-v store backend easily with help of this Backend. |
| <a href=#33 id=33 data-nosnippet>33</a></span><span class="attr">#[derive(Debug, Clone)] |
| <a href=#34 id=34 data-nosnippet>34</a></span><span class="kw">pub struct </span>Backend<S: Adapter> { |
| <a href=#35 id=35 data-nosnippet>35</a> kv: Arc<S>, |
| <a href=#36 id=36 data-nosnippet>36</a> root: String, |
| <a href=#37 id=37 data-nosnippet>37</a> info: Arc<AccessorInfo>, |
| <a href=#38 id=38 data-nosnippet>38</a>} |
| <a href=#39 id=39 data-nosnippet>39</a> |
| <a href=#40 id=40 data-nosnippet>40</a><span class="kw">impl</span><S> Backend<S> |
| <a href=#41 id=41 data-nosnippet>41</a><span class="kw">where |
| <a href=#42 id=42 data-nosnippet>42</a> </span>S: Adapter, |
| <a href=#43 id=43 data-nosnippet>43</a>{ |
| <a href=#44 id=44 data-nosnippet>44</a> <span class="doccomment">/// Create a new kv backend. |
| <a href=#45 id=45 data-nosnippet>45</a> </span><span class="kw">pub fn </span>new(kv: S) -> <span class="self">Self </span>{ |
| <a href=#46 id=46 data-nosnippet>46</a> <span class="kw">let </span>kv_info = kv.info(); |
| <a href=#47 id=47 data-nosnippet>47</a> <span class="self">Self </span>{ |
| <a href=#48 id=48 data-nosnippet>48</a> kv: Arc::new(kv), |
| <a href=#49 id=49 data-nosnippet>49</a> root: <span class="string">"/"</span>.to_string(), |
| <a href=#50 id=50 data-nosnippet>50</a> info: { |
| <a href=#51 id=51 data-nosnippet>51</a> <span class="kw">let </span>am: AccessorInfo = AccessorInfo::default(); |
| <a href=#52 id=52 data-nosnippet>52</a> am.set_root(<span class="string">"/"</span>); |
| <a href=#53 id=53 data-nosnippet>53</a> am.set_scheme(kv_info.scheme()); |
| <a href=#54 id=54 data-nosnippet>54</a> am.set_name(kv_info.name()); |
| <a href=#55 id=55 data-nosnippet>55</a> |
| <a href=#56 id=56 data-nosnippet>56</a> <span class="kw">let </span><span class="kw-2">mut </span>cap = kv_info.capabilities(); |
| <a href=#57 id=57 data-nosnippet>57</a> <span class="kw">if </span>cap.read { |
| <a href=#58 id=58 data-nosnippet>58</a> cap.stat = <span class="bool-val">true</span>; |
| <a href=#59 id=59 data-nosnippet>59</a> } |
| <a href=#60 id=60 data-nosnippet>60</a> |
| <a href=#61 id=61 data-nosnippet>61</a> <span class="kw">if </span>cap.write { |
| <a href=#62 id=62 data-nosnippet>62</a> cap.write_can_empty = <span class="bool-val">true</span>; |
| <a href=#63 id=63 data-nosnippet>63</a> cap.delete = <span class="bool-val">true</span>; |
| <a href=#64 id=64 data-nosnippet>64</a> } |
| <a href=#65 id=65 data-nosnippet>65</a> |
| <a href=#66 id=66 data-nosnippet>66</a> <span class="kw">if </span>cap.list { |
| <a href=#67 id=67 data-nosnippet>67</a> cap.list_with_recursive = <span class="bool-val">true</span>; |
| <a href=#68 id=68 data-nosnippet>68</a> } |
| <a href=#69 id=69 data-nosnippet>69</a> |
| <a href=#70 id=70 data-nosnippet>70</a> am.set_native_capability(cap); |
| <a href=#71 id=71 data-nosnippet>71</a> |
| <a href=#72 id=72 data-nosnippet>72</a> am.into() |
| <a href=#73 id=73 data-nosnippet>73</a> }, |
| <a href=#74 id=74 data-nosnippet>74</a> } |
| <a href=#75 id=75 data-nosnippet>75</a> } |
| <a href=#76 id=76 data-nosnippet>76</a> |
| <a href=#77 id=77 data-nosnippet>77</a> <span class="doccomment">/// Configure root within this backend. |
| <a href=#78 id=78 data-nosnippet>78</a> </span><span class="kw">pub fn </span>with_root(<span class="self">self</span>, root: <span class="kw-2">&</span>str) -> <span class="self">Self </span>{ |
| <a href=#79 id=79 data-nosnippet>79</a> <span class="self">self</span>.with_normalized_root(normalize_root(root)) |
| <a href=#80 id=80 data-nosnippet>80</a> } |
| <a href=#81 id=81 data-nosnippet>81</a> |
| <a href=#82 id=82 data-nosnippet>82</a> <span class="doccomment">/// Configure root within this backend. |
| <a href=#83 id=83 data-nosnippet>83</a> /// |
| <a href=#84 id=84 data-nosnippet>84</a> /// This method assumes root is normalized. |
| <a href=#85 id=85 data-nosnippet>85</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>with_normalized_root(<span class="kw-2">mut </span><span class="self">self</span>, root: String) -> <span class="self">Self </span>{ |
| <a href=#86 id=86 data-nosnippet>86</a> <span class="kw">let </span>root = normalize_root(<span class="kw-2">&</span>root); |
| <a href=#87 id=87 data-nosnippet>87</a> <span class="self">self</span>.info.set_root(<span class="kw-2">&</span>root); |
| <a href=#88 id=88 data-nosnippet>88</a> <span class="self">self</span>.root = root; |
| <a href=#89 id=89 data-nosnippet>89</a> <span class="self">self |
| <a href=#90 id=90 data-nosnippet>90</a> </span>} |
| <a href=#91 id=91 data-nosnippet>91</a>} |
| <a href=#92 id=92 data-nosnippet>92</a> |
| <a href=#93 id=93 data-nosnippet>93</a><span class="kw">impl</span><S: Adapter> Access <span class="kw">for </span>Backend<S> { |
| <a href=#94 id=94 data-nosnippet>94</a> <span class="kw">type </span>Reader = Buffer; |
| <a href=#95 id=95 data-nosnippet>95</a> <span class="kw">type </span>Writer = KvWriter<S>; |
| <a href=#96 id=96 data-nosnippet>96</a> <span class="kw">type </span>Lister = HierarchyLister<KvLister<S::Scanner>>; |
| <a href=#97 id=97 data-nosnippet>97</a> <span class="kw">type </span>Deleter = oio::OneShotDeleter<KvDeleter<S>>; |
| <a href=#98 id=98 data-nosnippet>98</a> |
| <a href=#99 id=99 data-nosnippet>99</a> <span class="kw">fn </span>info(<span class="kw-2">&</span><span class="self">self</span>) -> Arc<AccessorInfo> { |
| <a href=#100 id=100 data-nosnippet>100</a> <span class="self">self</span>.info.clone() |
| <a href=#101 id=101 data-nosnippet>101</a> } |
| <a href=#102 id=102 data-nosnippet>102</a> |
| <a href=#103 id=103 data-nosnippet>103</a> <span class="kw">async fn </span>stat(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>str, <span class="kw">_</span>: OpStat) -> <span class="prelude-ty">Result</span><RpStat> { |
| <a href=#104 id=104 data-nosnippet>104</a> <span class="kw">let </span>p = build_abs_path(<span class="kw-2">&</span><span class="self">self</span>.root, path); |
| <a href=#105 id=105 data-nosnippet>105</a> |
| <a href=#106 id=106 data-nosnippet>106</a> <span class="kw">if </span>p == build_abs_path(<span class="kw-2">&</span><span class="self">self</span>.root, <span class="string">""</span>) { |
| <a href=#107 id=107 data-nosnippet>107</a> <span class="prelude-val">Ok</span>(RpStat::new(Metadata::new(EntryMode::DIR))) |
| <a href=#108 id=108 data-nosnippet>108</a> } <span class="kw">else </span>{ |
| <a href=#109 id=109 data-nosnippet>109</a> <span class="kw">let </span>bs = <span class="self">self</span>.kv.get(<span class="kw-2">&</span>p).<span class="kw">await</span><span class="question-mark">?</span>; |
| <a href=#110 id=110 data-nosnippet>110</a> <span class="kw">match </span>bs { |
| <a href=#111 id=111 data-nosnippet>111</a> <span class="prelude-val">Some</span>(bs) => <span class="prelude-val">Ok</span>(RpStat::new( |
| <a href=#112 id=112 data-nosnippet>112</a> Metadata::new(EntryMode::FILE).with_content_length(bs.len() <span class="kw">as </span>u64), |
| <a href=#113 id=113 data-nosnippet>113</a> )), |
| <a href=#114 id=114 data-nosnippet>114</a> <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(Error::new(ErrorKind::NotFound, <span class="string">"kv doesn't have this path"</span>)), |
| <a href=#115 id=115 data-nosnippet>115</a> } |
| <a href=#116 id=116 data-nosnippet>116</a> } |
| <a href=#117 id=117 data-nosnippet>117</a> } |
| <a href=#118 id=118 data-nosnippet>118</a> |
| <a href=#119 id=119 data-nosnippet>119</a> <span class="kw">async fn </span>read(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>str, args: OpRead) -> <span class="prelude-ty">Result</span><(RpRead, <span class="self">Self</span>::Reader)> { |
| <a href=#120 id=120 data-nosnippet>120</a> <span class="kw">let </span>p = build_abs_path(<span class="kw-2">&</span><span class="self">self</span>.root, path); |
| <a href=#121 id=121 data-nosnippet>121</a> <span class="kw">let </span>bs = <span class="kw">match </span><span class="self">self</span>.kv.get(<span class="kw-2">&</span>p).<span class="kw">await</span><span class="question-mark">? </span>{ |
| <a href=#122 id=122 data-nosnippet>122</a> <span class="prelude-val">Some</span>(bs) => bs, |
| <a href=#123 id=123 data-nosnippet>123</a> <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new(ErrorKind::NotFound, <span class="string">"kv doesn't have this path"</span>)), |
| <a href=#124 id=124 data-nosnippet>124</a> }; |
| <a href=#125 id=125 data-nosnippet>125</a> <span class="prelude-val">Ok</span>((RpRead::new(), bs.slice(args.range().to_range_as_usize()))) |
| <a href=#126 id=126 data-nosnippet>126</a> } |
| <a href=#127 id=127 data-nosnippet>127</a> |
| <a href=#128 id=128 data-nosnippet>128</a> <span class="kw">async fn </span>write(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>str, <span class="kw">_</span>: OpWrite) -> <span class="prelude-ty">Result</span><(RpWrite, <span class="self">Self</span>::Writer)> { |
| <a href=#129 id=129 data-nosnippet>129</a> <span class="kw">let </span>p = build_abs_path(<span class="kw-2">&</span><span class="self">self</span>.root, path); |
| <a href=#130 id=130 data-nosnippet>130</a> |
| <a href=#131 id=131 data-nosnippet>131</a> <span class="prelude-val">Ok</span>((RpWrite::new(), KvWriter::new(<span class="self">self</span>.kv.clone(), p))) |
| <a href=#132 id=132 data-nosnippet>132</a> } |
| <a href=#133 id=133 data-nosnippet>133</a> |
| <a href=#134 id=134 data-nosnippet>134</a> <span class="kw">async fn </span>delete(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(RpDelete, <span class="self">Self</span>::Deleter)> { |
| <a href=#135 id=135 data-nosnippet>135</a> <span class="prelude-val">Ok</span>(( |
| <a href=#136 id=136 data-nosnippet>136</a> RpDelete::default(), |
| <a href=#137 id=137 data-nosnippet>137</a> oio::OneShotDeleter::new(KvDeleter::new(<span class="self">self</span>.kv.clone(), <span class="self">self</span>.root.clone())), |
| <a href=#138 id=138 data-nosnippet>138</a> )) |
| <a href=#139 id=139 data-nosnippet>139</a> } |
| <a href=#140 id=140 data-nosnippet>140</a> |
| <a href=#141 id=141 data-nosnippet>141</a> <span class="kw">async fn </span>list(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>str, args: OpList) -> <span class="prelude-ty">Result</span><(RpList, <span class="self">Self</span>::Lister)> { |
| <a href=#142 id=142 data-nosnippet>142</a> <span class="kw">let </span>p = build_abs_path(<span class="kw-2">&</span><span class="self">self</span>.root, path); |
| <a href=#143 id=143 data-nosnippet>143</a> <span class="kw">let </span>res = <span class="self">self</span>.kv.scan(<span class="kw-2">&</span>p).<span class="kw">await</span><span class="question-mark">?</span>; |
| <a href=#144 id=144 data-nosnippet>144</a> <span class="kw">let </span>lister = KvLister::new(<span class="kw-2">&</span><span class="self">self</span>.root, res); |
| <a href=#145 id=145 data-nosnippet>145</a> <span class="kw">let </span>lister = HierarchyLister::new(lister, path, args.recursive()); |
| <a href=#146 id=146 data-nosnippet>146</a> |
| <a href=#147 id=147 data-nosnippet>147</a> <span class="prelude-val">Ok</span>((RpList::default(), lister)) |
| <a href=#148 id=148 data-nosnippet>148</a> } |
| <a href=#149 id=149 data-nosnippet>149</a>} |
| <a href=#150 id=150 data-nosnippet>150</a> |
| <a href=#151 id=151 data-nosnippet>151</a><span class="kw">pub struct </span>KvLister<Iter> { |
| <a href=#152 id=152 data-nosnippet>152</a> root: String, |
| <a href=#153 id=153 data-nosnippet>153</a> inner: Iter, |
| <a href=#154 id=154 data-nosnippet>154</a>} |
| <a href=#155 id=155 data-nosnippet>155</a> |
| <a href=#156 id=156 data-nosnippet>156</a><span class="kw">impl</span><Iter> KvLister<Iter> |
| <a href=#157 id=157 data-nosnippet>157</a><span class="kw">where |
| <a href=#158 id=158 data-nosnippet>158</a> </span>Iter: Scan, |
| <a href=#159 id=159 data-nosnippet>159</a>{ |
| <a href=#160 id=160 data-nosnippet>160</a> <span class="kw">fn </span>new(root: <span class="kw-2">&</span>str, inner: Iter) -> <span class="self">Self </span>{ |
| <a href=#161 id=161 data-nosnippet>161</a> <span class="self">Self </span>{ |
| <a href=#162 id=162 data-nosnippet>162</a> root: root.to_string(), |
| <a href=#163 id=163 data-nosnippet>163</a> inner, |
| <a href=#164 id=164 data-nosnippet>164</a> } |
| <a href=#165 id=165 data-nosnippet>165</a> } |
| <a href=#166 id=166 data-nosnippet>166</a> |
| <a href=#167 id=167 data-nosnippet>167</a> <span class="kw">async fn </span>inner_next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><oio::Entry>> { |
| <a href=#168 id=168 data-nosnippet>168</a> <span class="prelude-val">Ok</span>(<span class="self">self</span>.inner.next().<span class="kw">await</span><span class="question-mark">?</span>.map(|v| { |
| <a href=#169 id=169 data-nosnippet>169</a> <span class="kw">let </span>mode = <span class="kw">if </span>v.ends_with(<span class="string">'/'</span>) { |
| <a href=#170 id=170 data-nosnippet>170</a> EntryMode::DIR |
| <a href=#171 id=171 data-nosnippet>171</a> } <span class="kw">else </span>{ |
| <a href=#172 id=172 data-nosnippet>172</a> EntryMode::FILE |
| <a href=#173 id=173 data-nosnippet>173</a> }; |
| <a href=#174 id=174 data-nosnippet>174</a> <span class="kw">let </span><span class="kw-2">mut </span>path = build_rel_path(<span class="kw-2">&</span><span class="self">self</span>.root, <span class="kw-2">&</span>v); |
| <a href=#175 id=175 data-nosnippet>175</a> <span class="kw">if </span>path.is_empty() { |
| <a href=#176 id=176 data-nosnippet>176</a> path = <span class="string">"/"</span>.to_string(); |
| <a href=#177 id=177 data-nosnippet>177</a> } |
| <a href=#178 id=178 data-nosnippet>178</a> oio::Entry::new(<span class="kw-2">&</span>path, Metadata::new(mode)) |
| <a href=#179 id=179 data-nosnippet>179</a> })) |
| <a href=#180 id=180 data-nosnippet>180</a> } |
| <a href=#181 id=181 data-nosnippet>181</a>} |
| <a href=#182 id=182 data-nosnippet>182</a> |
| <a href=#183 id=183 data-nosnippet>183</a><span class="kw">impl</span><Iter> oio::List <span class="kw">for </span>KvLister<Iter> |
| <a href=#184 id=184 data-nosnippet>184</a><span class="kw">where |
| <a href=#185 id=185 data-nosnippet>185</a> </span>Iter: Scan, |
| <a href=#186 id=186 data-nosnippet>186</a>{ |
| <a href=#187 id=187 data-nosnippet>187</a> <span class="kw">async fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><oio::Entry>> { |
| <a href=#188 id=188 data-nosnippet>188</a> <span class="self">self</span>.inner_next().<span class="kw">await |
| <a href=#189 id=189 data-nosnippet>189</a> </span>} |
| <a href=#190 id=190 data-nosnippet>190</a>} |
| <a href=#191 id=191 data-nosnippet>191</a> |
| <a href=#192 id=192 data-nosnippet>192</a><span class="kw">pub struct </span>KvWriter<S> { |
| <a href=#193 id=193 data-nosnippet>193</a> kv: Arc<S>, |
| <a href=#194 id=194 data-nosnippet>194</a> path: String, |
| <a href=#195 id=195 data-nosnippet>195</a> buffer: QueueBuf, |
| <a href=#196 id=196 data-nosnippet>196</a>} |
| <a href=#197 id=197 data-nosnippet>197</a> |
| <a href=#198 id=198 data-nosnippet>198</a><span class="kw">impl</span><S> KvWriter<S> { |
| <a href=#199 id=199 data-nosnippet>199</a> <span class="kw">fn </span>new(kv: Arc<S>, path: String) -> <span class="self">Self </span>{ |
| <a href=#200 id=200 data-nosnippet>200</a> KvWriter { |
| <a href=#201 id=201 data-nosnippet>201</a> kv, |
| <a href=#202 id=202 data-nosnippet>202</a> path, |
| <a href=#203 id=203 data-nosnippet>203</a> buffer: QueueBuf::new(), |
| <a href=#204 id=204 data-nosnippet>204</a> } |
| <a href=#205 id=205 data-nosnippet>205</a> } |
| <a href=#206 id=206 data-nosnippet>206</a>} |
| <a href=#207 id=207 data-nosnippet>207</a> |
| <a href=#208 id=208 data-nosnippet>208</a><span class="doccomment">/// # Safety |
| <a href=#209 id=209 data-nosnippet>209</a>/// |
| <a href=#210 id=210 data-nosnippet>210</a>/// We will only take `&mut Self` reference for KvWriter. |
| <a href=#211 id=211 data-nosnippet>211</a></span><span class="kw">unsafe impl</span><S: Adapter> Sync <span class="kw">for </span>KvWriter<S> {} |
| <a href=#212 id=212 data-nosnippet>212</a> |
| <a href=#213 id=213 data-nosnippet>213</a><span class="kw">impl</span><S: Adapter> oio::Write <span class="kw">for </span>KvWriter<S> { |
| <a href=#214 id=214 data-nosnippet>214</a> <span class="kw">async fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, bs: Buffer) -> <span class="prelude-ty">Result</span><()> { |
| <a href=#215 id=215 data-nosnippet>215</a> <span class="self">self</span>.buffer.push(bs); |
| <a href=#216 id=216 data-nosnippet>216</a> <span class="prelude-val">Ok</span>(()) |
| <a href=#217 id=217 data-nosnippet>217</a> } |
| <a href=#218 id=218 data-nosnippet>218</a> |
| <a href=#219 id=219 data-nosnippet>219</a> <span class="kw">async fn </span>close(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><Metadata> { |
| <a href=#220 id=220 data-nosnippet>220</a> <span class="kw">let </span>buf = <span class="self">self</span>.buffer.clone().collect(); |
| <a href=#221 id=221 data-nosnippet>221</a> <span class="kw">let </span>length = buf.len() <span class="kw">as </span>u64; |
| <a href=#222 id=222 data-nosnippet>222</a> <span class="self">self</span>.kv.set(<span class="kw-2">&</span><span class="self">self</span>.path, buf).<span class="kw">await</span><span class="question-mark">?</span>; |
| <a href=#223 id=223 data-nosnippet>223</a> |
| <a href=#224 id=224 data-nosnippet>224</a> <span class="kw">let </span>meta = Metadata::new(EntryMode::from_path(<span class="kw-2">&</span><span class="self">self</span>.path)).with_content_length(length); |
| <a href=#225 id=225 data-nosnippet>225</a> <span class="prelude-val">Ok</span>(meta) |
| <a href=#226 id=226 data-nosnippet>226</a> } |
| <a href=#227 id=227 data-nosnippet>227</a> |
| <a href=#228 id=228 data-nosnippet>228</a> <span class="kw">async fn </span>abort(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <a href=#229 id=229 data-nosnippet>229</a> <span class="self">self</span>.buffer.clear(); |
| <a href=#230 id=230 data-nosnippet>230</a> <span class="prelude-val">Ok</span>(()) |
| <a href=#231 id=231 data-nosnippet>231</a> } |
| <a href=#232 id=232 data-nosnippet>232</a>} |
| <a href=#233 id=233 data-nosnippet>233</a> |
| <a href=#234 id=234 data-nosnippet>234</a><span class="kw">pub struct </span>KvDeleter<S> { |
| <a href=#235 id=235 data-nosnippet>235</a> kv: Arc<S>, |
| <a href=#236 id=236 data-nosnippet>236</a> root: String, |
| <a href=#237 id=237 data-nosnippet>237</a>} |
| <a href=#238 id=238 data-nosnippet>238</a> |
| <a href=#239 id=239 data-nosnippet>239</a><span class="kw">impl</span><S> KvDeleter<S> { |
| <a href=#240 id=240 data-nosnippet>240</a> <span class="kw">fn </span>new(kv: Arc<S>, root: String) -> <span class="self">Self </span>{ |
| <a href=#241 id=241 data-nosnippet>241</a> KvDeleter { kv, root } |
| <a href=#242 id=242 data-nosnippet>242</a> } |
| <a href=#243 id=243 data-nosnippet>243</a>} |
| <a href=#244 id=244 data-nosnippet>244</a> |
| <a href=#245 id=245 data-nosnippet>245</a><span class="kw">impl</span><S: Adapter> oio::OneShotDelete <span class="kw">for </span>KvDeleter<S> { |
| <a href=#246 id=246 data-nosnippet>246</a> <span class="kw">async fn </span>delete_once(<span class="kw-2">&</span><span class="self">self</span>, path: String, <span class="kw">_</span>: OpDelete) -> <span class="prelude-ty">Result</span><()> { |
| <a href=#247 id=247 data-nosnippet>247</a> <span class="kw">let </span>p = build_abs_path(<span class="kw-2">&</span><span class="self">self</span>.root, <span class="kw-2">&</span>path); |
| <a href=#248 id=248 data-nosnippet>248</a> |
| <a href=#249 id=249 data-nosnippet>249</a> <span class="self">self</span>.kv.delete(<span class="kw-2">&</span>p).<span class="kw">await</span><span class="question-mark">?</span>; |
| <a href=#250 id=250 data-nosnippet>250</a> <span class="prelude-val">Ok</span>(()) |
| <a href=#251 id=251 data-nosnippet>251</a> } |
| <a href=#252 id=252 data-nosnippet>252</a>}</code></pre></div></section></main></body></html> |
