<!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\channels\parsers.rs`."><title>parsers.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"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-ca0dd0c4.css"><script id="default-settings"
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<a href=#2 id=2 data-nosnippet>2</a></span><span class="kw">use </span>std::sync::Arc;
<a href=#3 id=3 data-nosnippet>3</a>
<a href=#4 id=4 data-nosnippet>4</a><span class="comment">// External crate imports
<a href=#5 id=5 data-nosnippet>5</a></span><span class="kw">use </span>memchr::memchr;
<a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span>parking_lot::Mutex;
<a href=#7 id=7 data-nosnippet>7</a>
<a href=#8 id=8 data-nosnippet>8</a><span class="doccomment">/// Efficient message parser using memchr
<a href=#9 id=9 data-nosnippet>9</a></span><span class="kw">pub struct </span>FastMessageParser {
<a href=#10 id=10 data-nosnippet>10</a> delimiter: u8,
<a href=#11 id=11 data-nosnippet>11</a>}
<a href=#12 id=12 data-nosnippet>12</a>
<a href=#13 id=13 data-nosnippet>13</a><span class="kw">impl </span>FastMessageParser {
<a href=#14 id=14 data-nosnippet>14</a> <span class="doccomment">/// Create a new parser
<a href=#15 id=15 data-nosnippet>15</a> </span><span class="attr">#[must_use]
<a href=#16 id=16 data-nosnippet>16</a> </span><span class="kw">pub fn </span>new(delimiter: char) -> <span class="self">Self </span>{
<a href=#17 id=17 data-nosnippet>17</a> <span class="self">Self </span>{
<a href=#18 id=18 data-nosnippet>18</a> delimiter: delimiter <span class="kw">as </span>u8,
<a href=#19 id=19 data-nosnippet>19</a> }
<a href=#20 id=20 data-nosnippet>20</a> }
<a href=#21 id=21 data-nosnippet>21</a>
<a href=#22 id=22 data-nosnippet>22</a> <span class="doccomment">/// Parse messages from a buffer (zero-copy slicing)
<a href=#23 id=23 data-nosnippet>23</a> </span><span class="attr">#[must_use]
<a href=#24 id=24 data-nosnippet>24</a> </span><span class="kw">pub fn </span>parse_messages<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="self">self</span>, buffer: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> Vec<<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]> {
<a href=#25 id=25 data-nosnippet>25</a> <span class="kw">let </span><span class="kw-2">mut </span>messages = Vec::new();
<a href=#26 id=26 data-nosnippet>26</a> <span class="kw">let </span><span class="kw-2">mut </span>start = <span class="number">0</span>;
<a href=#27 id=27 data-nosnippet>27</a>
<a href=#28 id=28 data-nosnippet>28</a> <span class="kw">while let </span><span class="prelude-val">Some</span>(pos) = memchr(<span class="self">self</span>.delimiter, <span class="kw-2">&</span>buffer[start..]) {
<a href=#29 id=29 data-nosnippet>29</a> <span class="kw">let </span>abs_pos = start + pos;
<a href=#30 id=30 data-nosnippet>30</a> <span class="kw">if </span>abs_pos > start {
<a href=#31 id=31 data-nosnippet>31</a> messages.push(<span class="kw-2">&</span>buffer[start..abs_pos]);
<a href=#32 id=32 data-nosnippet>32</a> }
<a href=#33 id=33 data-nosnippet>33</a> start = abs_pos + <span class="number">1</span>;
<a href=#34 id=34 data-nosnippet>34</a> }
<a href=#35 id=35 data-nosnippet>35</a>
<a href=#36 id=36 data-nosnippet>36</a> <span class="kw">if </span>start < buffer.len() {
<a href=#37 id=37 data-nosnippet>37</a> messages.push(<span class="kw-2">&</span>buffer[start..]);
<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> messages
<a href=#41 id=41 data-nosnippet>41</a> }
<a href=#42 id=42 data-nosnippet>42</a>
<a href=#43 id=43 data-nosnippet>43</a> <span class="doccomment">/// Parse JSON messages efficiently
<a href=#44 id=44 data-nosnippet>44</a> ///
<a href=#45 id=45 data-nosnippet>45</a> /// # Errors
<a href=#46 id=46 data-nosnippet>46</a> ///
<a href=#47 id=47 data-nosnippet>47</a> /// Returns an error if JSON parsing fails for any message slice.
<a href=#48 id=48 data-nosnippet>48</a> </span><span class="kw">pub fn </span>parse_json_messages(
<a href=#49 id=49 data-nosnippet>49</a> <span class="kw-2">&</span><span class="self">self</span>,
<a href=#50 id=50 data-nosnippet>50</a> buffer: <span class="kw-2">&</span>[u8],
<a href=#51 id=51 data-nosnippet>51</a> ) -> <span class="prelude-ty">Result</span><Vec<serde_json::Value>, serde_json::Error> {
<a href=#52 id=52 data-nosnippet>52</a> <span class="kw">let </span>message_slices = <span class="self">self</span>.parse_messages(buffer);
<a href=#53 id=53 data-nosnippet>53</a> <span class="kw">let </span><span class="kw-2">mut </span>results = Vec::new();
<a href=#54 id=54 data-nosnippet>54</a>
<a href=#55 id=55 data-nosnippet>55</a> <span class="kw">for </span>slice <span class="kw">in </span>message_slices {
<a href=#56 id=56 data-nosnippet>56</a> <span class="kw">if let </span><span class="prelude-val">Ok</span>(s) = std::str::from_utf8(slice)
<a href=#57 id=57 data-nosnippet>57</a> && <span class="kw">let </span><span class="prelude-val">Ok</span>(value) = serde_json::from_str(s.trim())
<a href=#58 id=58 data-nosnippet>58</a> {
<a href=#59 id=59 data-nosnippet>59</a> results.push(value);
<a href=#60 id=60 data-nosnippet>60</a> }
<a href=#61 id=61 data-nosnippet>61</a> }
<a href=#62 id=62 data-nosnippet>62</a>
<a href=#63 id=63 data-nosnippet>63</a> <span class="prelude-val">Ok</span>(results)
<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>
<a href=#67 id=67 data-nosnippet>67</a><span class="doccomment">/// Channel aggregator for combining multiple channels (non-blocking)
<a href=#68 id=68 data-nosnippet>68</a></span><span class="kw">pub struct </span>ChannelAggregator<T> {
<a href=#69 id=69 data-nosnippet>69</a> inputs: Vec<<span class="kw">crate</span>::channels::core::RxFuture<T>>,
<a href=#70 id=70 data-nosnippet>70</a> output: <span class="kw">crate</span>::channels::core::TxFuture<T>,
<a href=#71 id=71 data-nosnippet>71</a>}
<a href=#72 id=72 data-nosnippet>72</a>
<a href=#73 id=73 data-nosnippet>73</a><span class="kw">impl</span><T: Send + <span class="lifetime">'static </span>+ Clone> ChannelAggregator<T> {
<a href=#74 id=74 data-nosnippet>74</a> <span class="doccomment">/// Create a new aggregator
<a href=#75 id=75 data-nosnippet>75</a> </span><span class="attr">#[must_use]
<a href=#76 id=76 data-nosnippet>76</a> </span><span class="kw">pub fn </span>new(
<a href=#77 id=77 data-nosnippet>77</a> inputs: Vec<<span class="kw">crate</span>::channels::core::RxFuture<T>>,
<a href=#78 id=78 data-nosnippet>78</a> output: <span class="kw">crate</span>::channels::core::TxFuture<T>,
<a href=#79 id=79 data-nosnippet>79</a> ) -> <span class="self">Self </span>{
<a href=#80 id=80 data-nosnippet>80</a> <span class="self">Self </span>{ inputs, output }
<a href=#81 id=81 data-nosnippet>81</a> }
<a href=#82 id=82 data-nosnippet>82</a>
<a href=#83 id=83 data-nosnippet>83</a> <span class="doccomment">/// Start aggregating messages (spawns non-blocking tasks)
<a href=#84 id=84 data-nosnippet>84</a> </span><span class="kw">pub fn </span>start(<span class="self">self</span>) {
<a href=#85 id=85 data-nosnippet>85</a> <span class="kw">for </span>receiver <span class="kw">in </span><span class="self">self</span>.inputs {
<a href=#86 id=86 data-nosnippet>86</a> <span class="kw">let </span>output = <span class="self">self</span>.output.clone();
<a href=#87 id=87 data-nosnippet>87</a> smol::spawn(<span class="kw">async move </span>{
<a href=#88 id=88 data-nosnippet>88</a> <span class="kw">let </span>rx = receiver;
<a href=#89 id=89 data-nosnippet>89</a> <span class="kw">while let </span><span class="prelude-val">Ok</span>(msg) = rx.recv().<span class="kw">await </span>{
<a href=#90 id=90 data-nosnippet>90</a> <span class="kw">let _ </span>= output.send(msg).<span class="kw">await</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> .detach();
<a href=#94 id=94 data-nosnippet>94</a> }
<a href=#95 id=95 data-nosnippet>95</a> }
<a href=#96 id=96 data-nosnippet>96</a>}
<a href=#97 id=97 data-nosnippet>97</a>
<a href=#98 id=98 data-nosnippet>98</a><span class="doccomment">/// Channel with automatic batching (non-blocking)
<a href=#99 id=99 data-nosnippet>99</a></span><span class="kw">pub struct </span>BatchingChannel<T> {
<a href=#100 id=100 data-nosnippet>100</a> tx: <span class="kw">crate</span>::channels::core::TxFuture<Vec<T>>,
<a href=#101 id=101 data-nosnippet>101</a> batch_size: usize,
<a href=#102 id=102 data-nosnippet>102</a> current_batch: Arc<Mutex<Vec<T>>>,
<a href=#103 id=103 data-nosnippet>103</a>}
<a href=#104 id=104 data-nosnippet>104</a>
<a href=#105 id=105 data-nosnippet>105</a><span class="kw">impl</span><T: Clone + Send + <span class="lifetime">'static</span>> BatchingChannel<T> {
<a href=#106 id=106 data-nosnippet>106</a> <span class="doccomment">/// Create a new batching channel
<a href=#107 id=107 data-nosnippet>107</a> </span><span class="attr">#[must_use]
<a href=#108 id=108 data-nosnippet>108</a> </span><span class="kw">pub fn </span>new(batch_size: usize, capacity: usize) -> <span class="self">Self </span>{
<a href=#109 id=109 data-nosnippet>109</a> <span class="kw">let </span>(tx, <span class="kw">_</span>) = <span class="kw">crate</span>::channels::core::bounded_queue_3(capacity);
<a href=#110 id=110 data-nosnippet>110</a> <span class="self">Self </span>{
<a href=#111 id=111 data-nosnippet>111</a> tx,
<a href=#112 id=112 data-nosnippet>112</a> batch_size,
<a href=#113 id=113 data-nosnippet>113</a> current_batch: Arc::new(Mutex::new(Vec::with_capacity(batch_size))),
<a href=#114 id=114 data-nosnippet>114</a> }
<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> <span class="doccomment">/// Send item (batches automatically, async, non-blocking)
<a href=#118 id=118 data-nosnippet>118</a> ///
<a href=#119 id=119 data-nosnippet>119</a> /// # Errors
<a href=#120 id=120 data-nosnippet>120</a> ///
<a href=#121 id=121 data-nosnippet>121</a> /// Returns an error if the channel is closed or full.
<a href=#122 id=122 data-nosnippet>122</a> </span><span class="kw">pub async fn </span>send(<span class="kw-2">&</span><span class="self">self</span>, item: T) -> <span class="prelude-ty">Result</span><(), Box<<span class="kw">dyn </span>std::error::Error>> {
<a href=#123 id=123 data-nosnippet>123</a> <span class="kw">let </span>should_flush = {
<a href=#124 id=124 data-nosnippet>124</a> <span class="kw">let </span><span class="kw-2">mut </span>batch = <span class="self">self</span>.current_batch.lock();
<a href=#125 id=125 data-nosnippet>125</a> batch.push(item);
<a href=#126 id=126 data-nosnippet>126</a> batch.len() >= <span class="self">self</span>.batch_size
<a href=#127 id=127 data-nosnippet>127</a> };
<a href=#128 id=128 data-nosnippet>128</a>
<a href=#129 id=129 data-nosnippet>129</a> <span class="kw">if </span>should_flush {
<a href=#130 id=130 data-nosnippet>130</a> <span class="self">self</span>.flush_batch().<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#131 id=131 data-nosnippet>131</a> }
<a href=#132 id=132 data-nosnippet>132</a>
<a href=#133 id=133 data-nosnippet>133</a> <span class="prelude-val">Ok</span>(())
<a href=#134 id=134 data-nosnippet>134</a> }
<a href=#135 id=135 data-nosnippet>135</a>
<a href=#136 id=136 data-nosnippet>136</a> <span class="doccomment">/// Flush current batch (async, non-blocking)
<a href=#137 id=137 data-nosnippet>137</a> ///
<a href=#138 id=138 data-nosnippet>138</a> /// # Errors
<a href=#139 id=139 data-nosnippet>139</a> ///
<a href=#140 id=140 data-nosnippet>140</a> /// Returns an error if the channel is closed or full.
<a href=#141 id=141 data-nosnippet>141</a> </span><span class="kw">pub async fn </span>flush_batch(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(), Box<<span class="kw">dyn </span>std::error::Error>> {
<a href=#142 id=142 data-nosnippet>142</a> <span class="kw">let </span>batch = {
<a href=#143 id=143 data-nosnippet>143</a> <span class="kw">let </span><span class="kw-2">mut </span>current = <span class="self">self</span>.current_batch.lock();
<a href=#144 id=144 data-nosnippet>144</a> std::mem::take(<span class="kw-2">&mut *</span>current)
<a href=#145 id=145 data-nosnippet>145</a> };
<a href=#146 id=146 data-nosnippet>146</a>
<a href=#147 id=147 data-nosnippet>147</a> <span class="kw">if </span>!batch.is_empty() {
<a href=#148 id=148 data-nosnippet>148</a> <span class="self">self</span>.tx.send(batch).<span class="kw">await</span><span class="question-mark">?</span>;
<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="prelude-val">Ok</span>(())
<a href=#152 id=152 data-nosnippet>152</a> }
<a href=#153 id=153 data-nosnippet>153</a>
<a href=#154 id=154 data-nosnippet>154</a> <span class="doccomment">/// Get the batch sender
<a href=#155 id=155 data-nosnippet>155</a> </span><span class="attr">#[must_use]
<a href=#156 id=156 data-nosnippet>156</a> </span><span class="kw">pub fn </span>batch_sender(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw">crate</span>::channels::core::TxFuture<Vec<T>> {
<a href=#157 id=157 data-nosnippet>157</a> <span class="self">self</span>.tx.clone()
<a href=#158 id=158 data-nosnippet>158</a> }
<a href=#159 id=159 data-nosnippet>159</a>}
<a href=#160 id=160 data-nosnippet>160</a>
<a href=#161 id=161 data-nosnippet>161</a><span class="doccomment">/// Channel with message filtering (non-blocking)
<a href=#162 id=162 data-nosnippet>162</a></span><span class="kw">pub struct </span>FilteredChannel<T, F> {
<a href=#163 id=163 data-nosnippet>163</a> tx: <span class="kw">crate</span>::channels::core::TxFuture<T>,
<a href=#164 id=164 data-nosnippet>164</a> filter: F,
<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">impl</span><T: Send + <span class="lifetime">'static</span>, F: Fn(<span class="kw-2">&</span>T) -> bool + Send + Sync + <span class="lifetime">'static</span>> FilteredChannel<T, F> {
<a href=#168 id=168 data-nosnippet>168</a> <span class="doccomment">/// Create a new filtered channel
<a href=#169 id=169 data-nosnippet>169</a> </span><span class="kw">pub fn </span>new(sender: <span class="kw">crate</span>::channels::core::TxFuture<T>, filter: F) -> <span class="self">Self </span>{
<a href=#170 id=170 data-nosnippet>170</a> <span class="self">Self </span>{ tx: sender, filter }
<a href=#171 id=171 data-nosnippet>171</a> }
<a href=#172 id=172 data-nosnippet>172</a>
<a href=#173 id=173 data-nosnippet>173</a> <span class="doccomment">/// Send message if it passes the filter (async, non-blocking)
<a href=#174 id=174 data-nosnippet>174</a> ///
<a href=#175 id=175 data-nosnippet>175</a> /// # Errors
<a href=#176 id=176 data-nosnippet>176</a> ///
<a href=#177 id=177 data-nosnippet>177</a> /// Returns an error if the channel is closed or full.
<a href=#178 id=178 data-nosnippet>178</a> </span><span class="kw">pub async fn </span>send_filtered(<span class="kw-2">&</span><span class="self">self</span>, msg: T) -> <span class="prelude-ty">Result</span><(), smol::channel::SendError<T>> {
<a href=#179 id=179 data-nosnippet>179</a> <span class="kw">if </span>(<span class="self">self</span>.filter)(<span class="kw-2">&</span>msg) {
<a href=#180 id=180 data-nosnippet>180</a> <span class="self">self</span>.tx.send(msg).<span class="kw">await
<a href=#181 id=181 data-nosnippet>181</a> </span>} <span class="kw">else </span>{
<a href=#182 id=182 data-nosnippet>182</a> <span class="prelude-val">Ok</span>(()) <span class="comment">// Silently drop filtered messages
<a href=#183 id=183 data-nosnippet>183</a> </span>}
<a href=#184 id=184 data-nosnippet>184</a> }
<a href=#185 id=185 data-nosnippet>185</a>}</code></pre></div></section></main></body></html>