<!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\io\writers.rs`."><title>writers.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>//!
<a href=#3 id=3 data-nosnippet>3</a>//! This module provides ergonomic async writers for various output destinations,
<a href=#4 id=4 data-nosnippet>4</a>//! with built-in buffering, compression, and serialization support.
<a href=#5 id=5 data-nosnippet>5</a>//!
<a href=#6 id=6 data-nosnippet>6</a>//! ## Features
<a href=#7 id=7 data-nosnippet>7</a>//!
<a href=#8 id=8 data-nosnippet>8</a>//! - **Buffered Writing**: Automatic buffering with configurable flush triggers
<a href=#9 id=9 data-nosnippet>9</a>//! - **Compression**: Integrated Brotli/gzip compression for file writers
<a href=#10 id=10 data-nosnippet>10</a>//! - **Serialization**: JSON/binary serialization using serde utilities
<a href=#11 id=11 data-nosnippet>11</a>//! - **Async Operations**: Non-blocking writes using smol and futures-lite
<a href=#12 id=12 data-nosnippet>12</a>//! - **Progress Tracking**: Optional progress callbacks and statistics
<a href=#13 id=13 data-nosnippet>13</a>
<a href=#14 id=14 data-nosnippet>14</a></span><span class="comment">// Standard library imports
<a href=#15 id=15 data-nosnippet>15</a>// (none needed)
<a href=#16 id=16 data-nosnippet>16</a>
<a href=#17 id=17 data-nosnippet>17</a>// External crate imports
<a href=#18 id=18 data-nosnippet>18</a></span><span class="kw">use </span>bytes::Bytes;
<a href=#19 id=19 data-nosnippet>19</a><span class="kw">use </span>futures_lite::{AsyncWriteExt, StreamExt};
<a href=#20 id=20 data-nosnippet>20</a>
<a href=#21 id=21 data-nosnippet>21</a><span class="doccomment">/// Async buffered file writer with compression support
<a href=#22 id=22 data-nosnippet>22</a>///
<a href=#23 id=23 data-nosnippet>23</a>/// Provides buffered writing with automatic flushing, optional compression,
<a href=#24 id=24 data-nosnippet>24</a>/// and progress tracking. Uses smol for async I/O operations.
<a href=#25 id=25 data-nosnippet>25</a></span><span class="attr">#[derive(Debug)]
<a href=#26 id=26 data-nosnippet>26</a></span><span class="kw">pub struct </span>AsyncFileWriter {
<a href=#27 id=27 data-nosnippet>27</a> file: smol::fs::File,
<a href=#28 id=28 data-nosnippet>28</a> buffer: Vec<u8>,
<a href=#29 id=29 data-nosnippet>29</a> buffer_size: usize,
<a href=#30 id=30 data-nosnippet>30</a> compressed: bool,
<a href=#31 id=31 data-nosnippet>31</a> bytes_written: u64,
<a href=#32 id=32 data-nosnippet>32</a>}
<a href=#33 id=33 data-nosnippet>33</a>
<a href=#34 id=34 data-nosnippet>34</a><span class="kw">impl </span>AsyncFileWriter {
<a href=#35 id=35 data-nosnippet>35</a> <span class="doccomment">/// Create a new async file writer with default settings
<a href=#36 id=36 data-nosnippet>36</a> ///
<a href=#37 id=37 data-nosnippet>37</a> /// # Parameters
<a href=#38 id=38 data-nosnippet>38</a> /// - `path`: Path to the file to write
<a href=#39 id=39 data-nosnippet>39</a> ///
<a href=#40 id=40 data-nosnippet>40</a> /// # Returns
<a href=#41 id=41 data-nosnippet>41</a> /// New `AsyncFileWriter` instance
<a href=#42 id=42 data-nosnippet>42</a> ///
<a href=#43 id=43 data-nosnippet>43</a> /// # Errors
<a href=#44 id=44 data-nosnippet>44</a> /// Returns error if file cannot be created
<a href=#45 id=45 data-nosnippet>45</a> </span><span class="kw">pub async fn </span>new(path: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, std::io::Error> {
<a href=#46 id=46 data-nosnippet>46</a> <span class="self">Self</span>::with_config(path, <span class="number">8192</span>, <span class="bool-val">false</span>).<span class="kw">await
<a href=#47 id=47 data-nosnippet>47</a> </span>}
<a href=#48 id=48 data-nosnippet>48</a>
<a href=#49 id=49 data-nosnippet>49</a> <span class="doccomment">/// Create a new async file writer with custom configuration
<a href=#50 id=50 data-nosnippet>50</a> ///
<a href=#51 id=51 data-nosnippet>51</a> /// # Parameters
<a href=#52 id=52 data-nosnippet>52</a> /// - `path`: Path to the file to write
<a href=#53 id=53 data-nosnippet>53</a> /// - `buffer_size`: Size of the write buffer in bytes
<a href=#54 id=54 data-nosnippet>54</a> /// - `compressed`: Whether to compress data using Brotli
<a href=#55 id=55 data-nosnippet>55</a> ///
<a href=#56 id=56 data-nosnippet>56</a> /// # Returns
<a href=#57 id=57 data-nosnippet>57</a> /// Configured `AsyncFileWriter` instance
<a href=#58 id=58 data-nosnippet>58</a> ///
<a href=#59 id=59 data-nosnippet>59</a> /// # Errors
<a href=#60 id=60 data-nosnippet>60</a> /// Returns error if file cannot be created
<a href=#61 id=61 data-nosnippet>61</a> </span><span class="kw">pub async fn </span>with_config(
<a href=#62 id=62 data-nosnippet>62</a> path: <span class="kw-2">&</span>str,
<a href=#63 id=63 data-nosnippet>63</a> buffer_size: usize,
<a href=#64 id=64 data-nosnippet>64</a> compressed: bool,
<a href=#65 id=65 data-nosnippet>65</a> ) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, std::io::Error> {
<a href=#66 id=66 data-nosnippet>66</a> <span class="kw">let </span>file = smol::fs::File::create(path).<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#67 id=67 data-nosnippet>67</a> <span class="prelude-val">Ok</span>(<span class="self">Self </span>{
<a href=#68 id=68 data-nosnippet>68</a> file,
<a href=#69 id=69 data-nosnippet>69</a> buffer: Vec::with_capacity(buffer_size),
<a href=#70 id=70 data-nosnippet>70</a> buffer_size,
<a href=#71 id=71 data-nosnippet>71</a> compressed,
<a href=#72 id=72 data-nosnippet>72</a> bytes_written: <span class="number">0</span>,
<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> <span class="doccomment">/// Write data to the buffer (async, non-blocking)
<a href=#77 id=77 data-nosnippet>77</a> ///
<a href=#78 id=78 data-nosnippet>78</a> /// Data is buffered until the buffer is full or `flush()` is called.
<a href=#79 id=79 data-nosnippet>79</a> /// If compression is enabled, data is compressed before buffering.
<a href=#80 id=80 data-nosnippet>80</a> ///
<a href=#81 id=81 data-nosnippet>81</a> /// # Parameters
<a href=#82 id=82 data-nosnippet>82</a> /// - `data`: Data to write
<a href=#83 id=83 data-nosnippet>83</a> ///
<a href=#84 id=84 data-nosnippet>84</a> /// # Returns
<a href=#85 id=85 data-nosnippet>85</a> /// Success or I/O error
<a href=#86 id=86 data-nosnippet>86</a> ///
<a href=#87 id=87 data-nosnippet>87</a> /// # Errors
<a href=#88 id=88 data-nosnippet>88</a> /// Returns error if compression fails or buffer write fails
<a href=#89 id=89 data-nosnippet>89</a> </span><span class="kw">pub async fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, data: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#90 id=90 data-nosnippet>90</a> <span class="kw">let </span>data_to_write = <span class="kw">if </span><span class="self">self</span>.compressed {
<a href=#91 id=91 data-nosnippet>91</a> <span class="comment">// Compress data using our compression utilities
<a href=#92 id=92 data-nosnippet>92</a> </span><span class="kw">crate</span>::io::utils::compress_brotli(data, <span class="number">6</span>)<span class="question-mark">?
<a href=#93 id=93 data-nosnippet>93</a> </span>} <span class="kw">else </span>{
<a href=#94 id=94 data-nosnippet>94</a> data.to_vec()
<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> <span class="self">self</span>.buffer.extend_from_slice(<span class="kw-2">&</span>data_to_write);
<a href=#98 id=98 data-nosnippet>98</a>
<a href=#99 id=99 data-nosnippet>99</a> <span class="kw">if </span><span class="self">self</span>.buffer.len() >= <span class="self">self</span>.buffer_size {
<a href=#100 id=100 data-nosnippet>100</a> <span class="self">self</span>.flush().<span class="kw">await</span><span class="question-mark">?</span>;
<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="prelude-val">Ok</span>(())
<a href=#104 id=104 data-nosnippet>104</a> }
<a href=#105 id=105 data-nosnippet>105</a>
<a href=#106 id=106 data-nosnippet>106</a> <span class="doccomment">/// Write serialized data (async, non-blocking)
<a href=#107 id=107 data-nosnippet>107</a> ///
<a href=#108 id=108 data-nosnippet>108</a> /// Serializes the data to JSON and writes it with optional compression.
<a href=#109 id=109 data-nosnippet>109</a> ///
<a href=#110 id=110 data-nosnippet>110</a> /// # Type Parameters
<a href=#111 id=111 data-nosnippet>111</a> /// - `T`: Type that implements serde Serialize
<a href=#112 id=112 data-nosnippet>112</a> ///
<a href=#113 id=113 data-nosnippet>113</a> /// # Parameters
<a href=#114 id=114 data-nosnippet>114</a> /// - `data`: Data to serialize and write
<a href=#115 id=115 data-nosnippet>115</a> ///
<a href=#116 id=116 data-nosnippet>116</a> /// # Returns
<a href=#117 id=117 data-nosnippet>117</a> /// Success or error
<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> /// Returns error if serialization, compression, or writing fails
<a href=#121 id=121 data-nosnippet>121</a> </span><span class="kw">pub async fn </span>write_json<T: serde::Serialize>(
<a href=#122 id=122 data-nosnippet>122</a> <span class="kw-2">&mut </span><span class="self">self</span>,
<a href=#123 id=123 data-nosnippet>123</a> data: <span class="kw-2">&</span>T,
<a href=#124 id=124 data-nosnippet>124</a> ) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#125 id=125 data-nosnippet>125</a> <span class="kw">let </span>json = serde_json::to_string(data)
<a href=#126 id=126 data-nosnippet>126</a> .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e))<span class="question-mark">?</span>;
<a href=#127 id=127 data-nosnippet>127</a> <span class="self">self</span>.write(json.as_bytes()).<span class="kw">await
<a href=#128 id=128 data-nosnippet>128</a> </span>}
<a href=#129 id=129 data-nosnippet>129</a>
<a href=#130 id=130 data-nosnippet>130</a> <span class="doccomment">/// Flush buffer to file (async, non-blocking)
<a href=#131 id=131 data-nosnippet>131</a> ///
<a href=#132 id=132 data-nosnippet>132</a> /// Forces all buffered data to be written to the file.
<a href=#133 id=133 data-nosnippet>133</a> ///
<a href=#134 id=134 data-nosnippet>134</a> /// # Returns
<a href=#135 id=135 data-nosnippet>135</a> /// Success or I/O error
<a href=#136 id=136 data-nosnippet>136</a> ///
<a href=#137 id=137 data-nosnippet>137</a> /// # Errors
<a href=#138 id=138 data-nosnippet>138</a> /// Returns error if file write fails
<a href=#139 id=139 data-nosnippet>139</a> </span><span class="kw">pub async fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#140 id=140 data-nosnippet>140</a> <span class="kw">if </span>!<span class="self">self</span>.buffer.is_empty() {
<a href=#141 id=141 data-nosnippet>141</a> <span class="self">self</span>.file.write_all(<span class="kw-2">&</span><span class="self">self</span>.buffer).<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#142 id=142 data-nosnippet>142</a> <span class="self">self</span>.bytes_written += <span class="self">self</span>.buffer.len() <span class="kw">as </span>u64;
<a href=#143 id=143 data-nosnippet>143</a> <span class="self">self</span>.buffer.clear();
<a href=#144 id=144 data-nosnippet>144</a> }
<a href=#145 id=145 data-nosnippet>145</a> <span class="self">self</span>.file.flush().<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#146 id=146 data-nosnippet>146</a> <span class="prelude-val">Ok</span>(())
<a href=#147 id=147 data-nosnippet>147</a> }
<a href=#148 id=148 data-nosnippet>148</a>
<a href=#149 id=149 data-nosnippet>149</a> <span class="doccomment">/// Get total bytes written to the file
<a href=#150 id=150 data-nosnippet>150</a> </span><span class="attr">#[must_use]
<a href=#151 id=151 data-nosnippet>151</a> </span><span class="kw">pub fn </span>bytes_written(<span class="kw-2">&</span><span class="self">self</span>) -> u64 {
<a href=#152 id=152 data-nosnippet>152</a> <span class="self">self</span>.bytes_written
<a href=#153 id=153 data-nosnippet>153</a> }
<a href=#154 id=154 data-nosnippet>154</a>
<a href=#155 id=155 data-nosnippet>155</a> <span class="doccomment">/// Check if compression is enabled
<a href=#156 id=156 data-nosnippet>156</a> </span><span class="attr">#[must_use]
<a href=#157 id=157 data-nosnippet>157</a> </span><span class="kw">pub fn </span>is_compressed(<span class="kw-2">&</span><span class="self">self</span>) -> bool {
<a href=#158 id=158 data-nosnippet>158</a> <span class="self">self</span>.compressed
<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>
<a href=#162 id=162 data-nosnippet>162</a><span class="kw">impl </span>Drop <span class="kw">for </span>AsyncFileWriter {
<a href=#163 id=163 data-nosnippet>163</a> <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) {
<a href=#164 id=164 data-nosnippet>164</a> <span class="comment">// Note: This is sync, in practice you'd want an async drop
<a href=#165 id=165 data-nosnippet>165</a> </span>futures_lite::future::block_on(<span class="kw">async </span>{
<a href=#166 id=166 data-nosnippet>166</a> <span class="kw">let _ </span>= <span class="self">self</span>.flush().<span class="kw">await</span>;
<a href=#167 id=167 data-nosnippet>167</a> });
<a href=#168 id=168 data-nosnippet>168</a> }
<a href=#169 id=169 data-nosnippet>169</a>}
<a href=#170 id=170 data-nosnippet>170</a>
<a href=#171 id=171 data-nosnippet>171</a><span class="doccomment">/// Streaming file writer for large data sets
<a href=#172 id=172 data-nosnippet>172</a>///
<a href=#173 id=173 data-nosnippet>173</a>/// Optimized for streaming large amounts of data with minimal memory usage.
<a href=#174 id=174 data-nosnippet>174</a>/// Uses chunked writing and can integrate with async streams.
<a href=#175 id=175 data-nosnippet>175</a></span><span class="kw">pub struct </span>StreamingFileWriter {
<a href=#176 id=176 data-nosnippet>176</a> file: smol::fs::File,
<a href=#177 id=177 data-nosnippet>177</a> chunk_size: usize,
<a href=#178 id=178 data-nosnippet>178</a> compressed: bool,
<a href=#179 id=179 data-nosnippet>179</a> bytes_written: u64,
<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><span class="kw">impl </span>StreamingFileWriter {
<a href=#183 id=183 data-nosnippet>183</a> <span class="doccomment">/// Create a new streaming file writer
<a href=#184 id=184 data-nosnippet>184</a> ///
<a href=#185 id=185 data-nosnippet>185</a> /// # Parameters
<a href=#186 id=186 data-nosnippet>186</a> /// - `path`: Path to the file to write
<a href=#187 id=187 data-nosnippet>187</a> /// - `chunk_size`: Size of chunks to write at once
<a href=#188 id=188 data-nosnippet>188</a> /// - `compressed`: Whether to compress chunks
<a href=#189 id=189 data-nosnippet>189</a> ///
<a href=#190 id=190 data-nosnippet>190</a> /// # Returns
<a href=#191 id=191 data-nosnippet>191</a> /// New `StreamingFileWriter` instance
<a href=#192 id=192 data-nosnippet>192</a> ///
<a href=#193 id=193 data-nosnippet>193</a> /// # Errors
<a href=#194 id=194 data-nosnippet>194</a> /// Returns error if file cannot be created
<a href=#195 id=195 data-nosnippet>195</a> </span><span class="kw">pub async fn </span>new(
<a href=#196 id=196 data-nosnippet>196</a> path: <span class="kw-2">&</span>str,
<a href=#197 id=197 data-nosnippet>197</a> chunk_size: usize,
<a href=#198 id=198 data-nosnippet>198</a> compressed: bool,
<a href=#199 id=199 data-nosnippet>199</a> ) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, std::io::Error> {
<a href=#200 id=200 data-nosnippet>200</a> <span class="kw">let </span>file = smol::fs::File::create(path).<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#201 id=201 data-nosnippet>201</a> <span class="prelude-val">Ok</span>(<span class="self">Self </span>{
<a href=#202 id=202 data-nosnippet>202</a> file,
<a href=#203 id=203 data-nosnippet>203</a> chunk_size,
<a href=#204 id=204 data-nosnippet>204</a> compressed,
<a href=#205 id=205 data-nosnippet>205</a> bytes_written: <span class="number">0</span>,
<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>
<a href=#209 id=209 data-nosnippet>209</a> <span class="doccomment">/// Write a chunk of data (async, non-blocking)
<a href=#210 id=210 data-nosnippet>210</a> ///
<a href=#211 id=211 data-nosnippet>211</a> /// Writes data immediately without buffering. Suitable for streaming.
<a href=#212 id=212 data-nosnippet>212</a> ///
<a href=#213 id=213 data-nosnippet>213</a> /// # Parameters
<a href=#214 id=214 data-nosnippet>214</a> /// - `data`: Data chunk to write
<a href=#215 id=215 data-nosnippet>215</a> ///
<a href=#216 id=216 data-nosnippet>216</a> /// # Returns
<a href=#217 id=217 data-nosnippet>217</a> /// Success or I/O error
<a href=#218 id=218 data-nosnippet>218</a> ///
<a href=#219 id=219 data-nosnippet>219</a> /// # Errors
<a href=#220 id=220 data-nosnippet>220</a> /// Returns error if compression or writing fails
<a href=#221 id=221 data-nosnippet>221</a> </span><span class="kw">pub async fn </span>write_chunk(<span class="kw-2">&mut </span><span class="self">self</span>, data: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#222 id=222 data-nosnippet>222</a> <span class="kw">let </span>data_to_write = <span class="kw">if </span><span class="self">self</span>.compressed {
<a href=#223 id=223 data-nosnippet>223</a> <span class="kw">crate</span>::io::utils::compress_brotli(data, <span class="number">6</span>)<span class="question-mark">?
<a href=#224 id=224 data-nosnippet>224</a> </span>} <span class="kw">else </span>{
<a href=#225 id=225 data-nosnippet>225</a> data.to_vec()
<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="self">self</span>.file.write_all(<span class="kw-2">&</span>data_to_write).<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#229 id=229 data-nosnippet>229</a> <span class="self">self</span>.bytes_written += data_to_write.len() <span class="kw">as </span>u64;
<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> <span class="doccomment">/// Write from an async stream (async, non-blocking)
<a href=#234 id=234 data-nosnippet>234</a> ///
<a href=#235 id=235 data-nosnippet>235</a> /// Consumes an async stream and writes all chunks to the file.
<a href=#236 id=236 data-nosnippet>236</a> ///
<a href=#237 id=237 data-nosnippet>237</a> /// # Type Parameters
<a href=#238 id=238 data-nosnippet>238</a> /// - `S`: Async stream type yielding byte chunks
<a href=#239 id=239 data-nosnippet>239</a> ///
<a href=#240 id=240 data-nosnippet>240</a> /// # Parameters
<a href=#241 id=241 data-nosnippet>241</a> /// - `stream`: Async stream of byte data
<a href=#242 id=242 data-nosnippet>242</a> ///
<a href=#243 id=243 data-nosnippet>243</a> /// # Returns
<a href=#244 id=244 data-nosnippet>244</a> /// Success or error
<a href=#245 id=245 data-nosnippet>245</a> ///
<a href=#246 id=246 data-nosnippet>246</a> /// # Errors
<a href=#247 id=247 data-nosnippet>247</a> /// Returns error if reading from stream or writing fails
<a href=#248 id=248 data-nosnippet>248</a> </span><span class="kw">pub async fn </span>write_from_stream<S>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>stream: S) -> <span class="prelude-ty">Result</span><(), std::io::Error>
<a href=#249 id=249 data-nosnippet>249</a> <span class="kw">where
<a href=#250 id=250 data-nosnippet>250</a> </span>S: futures_lite::Stream<Item = <span class="prelude-ty">Result</span><Bytes, std::io::Error>> + Unpin,
<a href=#251 id=251 data-nosnippet>251</a> {
<a href=#252 id=252 data-nosnippet>252</a> <span class="kw">while let </span><span class="prelude-val">Some</span>(chunk_result) = stream.next().<span class="kw">await </span>{
<a href=#253 id=253 data-nosnippet>253</a> <span class="kw">let </span>chunk = chunk_result<span class="question-mark">?</span>;
<a href=#254 id=254 data-nosnippet>254</a> <span class="self">self</span>.write_chunk(<span class="kw-2">&</span>chunk).<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#255 id=255 data-nosnippet>255</a> }
<a href=#256 id=256 data-nosnippet>256</a> <span class="self">self</span>.file.flush().<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#257 id=257 data-nosnippet>257</a> <span class="prelude-val">Ok</span>(())
<a href=#258 id=258 data-nosnippet>258</a> }
<a href=#259 id=259 data-nosnippet>259</a>
<a href=#260 id=260 data-nosnippet>260</a> <span class="doccomment">/// Get total bytes written
<a href=#261 id=261 data-nosnippet>261</a> </span><span class="attr">#[must_use]
<a href=#262 id=262 data-nosnippet>262</a> </span><span class="kw">pub fn </span>bytes_written(<span class="kw-2">&</span><span class="self">self</span>) -> u64 {
<a href=#263 id=263 data-nosnippet>263</a> <span class="self">self</span>.bytes_written
<a href=#264 id=264 data-nosnippet>264</a> }
<a href=#265 id=265 data-nosnippet>265</a>
<a href=#266 id=266 data-nosnippet>266</a> <span class="doccomment">/// Get the chunk size
<a href=#267 id=267 data-nosnippet>267</a> </span><span class="attr">#[must_use]
<a href=#268 id=268 data-nosnippet>268</a> </span><span class="kw">pub fn </span>chunk_size(<span class="kw-2">&</span><span class="self">self</span>) -> usize {
<a href=#269 id=269 data-nosnippet>269</a> <span class="self">self</span>.chunk_size
<a href=#270 id=270 data-nosnippet>270</a> }
<a href=#271 id=271 data-nosnippet>271</a>}
<a href=#272 id=272 data-nosnippet>272</a>
<a href=#273 id=273 data-nosnippet>273</a><span class="doccomment">/// Buffered writer with automatic compression and serialization
<a href=#274 id=274 data-nosnippet>274</a>///
<a href=#275 id=275 data-nosnippet>275</a>/// Advanced writer that combines buffering, compression, and serialization
<a href=#276 id=276 data-nosnippet>276</a>/// with progress tracking and error recovery.
<a href=#277 id=277 data-nosnippet>277</a></span><span class="kw">pub struct </span>AdvancedFileWriter {
<a href=#278 id=278 data-nosnippet>278</a> inner: AsyncFileWriter,
<a href=#279 id=279 data-nosnippet>279</a> progress_callback: <span class="prelude-ty">Option</span><Box<<span class="kw">dyn </span>Fn(u64) + Send + Sync>>,
<a href=#280 id=280 data-nosnippet>280</a> error_recovery: bool,
<a href=#281 id=281 data-nosnippet>281</a>}
<a href=#282 id=282 data-nosnippet>282</a>
<a href=#283 id=283 data-nosnippet>283</a><span class="kw">impl </span>AdvancedFileWriter {
<a href=#284 id=284 data-nosnippet>284</a> <span class="doccomment">/// Create a new advanced file writer
<a href=#285 id=285 data-nosnippet>285</a> ///
<a href=#286 id=286 data-nosnippet>286</a> /// # Parameters
<a href=#287 id=287 data-nosnippet>287</a> /// - `path`: Path to the file to write
<a href=#288 id=288 data-nosnippet>288</a> /// - `buffer_size`: Size of the write buffer
<a href=#289 id=289 data-nosnippet>289</a> /// - `compressed`: Whether to compress data
<a href=#290 id=290 data-nosnippet>290</a> /// - `progress_callback`: Optional callback for progress updates
<a href=#291 id=291 data-nosnippet>291</a> /// - `error_recovery`: Whether to attempt error recovery
<a href=#292 id=292 data-nosnippet>292</a> ///
<a href=#293 id=293 data-nosnippet>293</a> /// # Returns
<a href=#294 id=294 data-nosnippet>294</a> /// New `AdvancedFileWriter` instance
<a href=#295 id=295 data-nosnippet>295</a> ///
<a href=#296 id=296 data-nosnippet>296</a> /// # Errors
<a href=#297 id=297 data-nosnippet>297</a> /// Returns error if file cannot be created
<a href=#298 id=298 data-nosnippet>298</a> </span><span class="kw">pub async fn </span>new(
<a href=#299 id=299 data-nosnippet>299</a> path: <span class="kw-2">&</span>str,
<a href=#300 id=300 data-nosnippet>300</a> buffer_size: usize,
<a href=#301 id=301 data-nosnippet>301</a> compressed: bool,
<a href=#302 id=302 data-nosnippet>302</a> progress_callback: <span class="prelude-ty">Option</span><Box<<span class="kw">dyn </span>Fn(u64) + Send + Sync>>,
<a href=#303 id=303 data-nosnippet>303</a> error_recovery: bool,
<a href=#304 id=304 data-nosnippet>304</a> ) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, std::io::Error> {
<a href=#305 id=305 data-nosnippet>305</a> <span class="kw">let </span>inner = AsyncFileWriter::with_config(path, buffer_size, compressed).<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#306 id=306 data-nosnippet>306</a> <span class="prelude-val">Ok</span>(<span class="self">Self </span>{
<a href=#307 id=307 data-nosnippet>307</a> inner,
<a href=#308 id=308 data-nosnippet>308</a> progress_callback,
<a href=#309 id=309 data-nosnippet>309</a> error_recovery,
<a href=#310 id=310 data-nosnippet>310</a> })
<a href=#311 id=311 data-nosnippet>311</a> }
<a href=#312 id=312 data-nosnippet>312</a>
<a href=#313 id=313 data-nosnippet>313</a> <span class="doccomment">/// Write data with progress tracking and error recovery
<a href=#314 id=314 data-nosnippet>314</a> ///
<a href=#315 id=315 data-nosnippet>315</a> /// # Parameters
<a href=#316 id=316 data-nosnippet>316</a> /// - `data`: Data to write
<a href=#317 id=317 data-nosnippet>317</a> ///
<a href=#318 id=318 data-nosnippet>318</a> /// # Returns
<a href=#319 id=319 data-nosnippet>319</a> /// Success or error
<a href=#320 id=320 data-nosnippet>320</a> ///
<a href=#321 id=321 data-nosnippet>321</a> /// # Errors
<a href=#322 id=322 data-nosnippet>322</a> /// Returns error if writing fails (with optional recovery attempts)
<a href=#323 id=323 data-nosnippet>323</a> </span><span class="kw">pub async fn </span>write_with_progress(<span class="kw-2">&mut </span><span class="self">self</span>, data: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#324 id=324 data-nosnippet>324</a> <span class="kw">let </span>result = <span class="self">self</span>.inner.write(data).<span class="kw">await</span>;
<a href=#325 id=325 data-nosnippet>325</a>
<a href=#326 id=326 data-nosnippet>326</a> <span class="kw">if let </span><span class="prelude-val">Err</span>(<span class="kw-2">ref </span>e) = result
<a href=#327 id=327 data-nosnippet>327</a> && <span class="self">self</span>.error_recovery
<a href=#328 id=328 data-nosnippet>328</a> {
<a href=#329 id=329 data-nosnippet>329</a> <span class="comment">// Attempt recovery (could implement retry logic, backup writing, etc.)
<a href=#330 id=330 data-nosnippet>330</a> </span><span class="macro">eprintln!</span>(<span class="string">"Write error, attempting recovery: {e}"</span>);
<a href=#331 id=331 data-nosnippet>331</a> <span class="comment">// For now, just log - could implement more sophisticated recovery
<a href=#332 id=332 data-nosnippet>332</a> </span>}
<a href=#333 id=333 data-nosnippet>333</a>
<a href=#334 id=334 data-nosnippet>334</a> <span class="comment">// Update progress
<a href=#335 id=335 data-nosnippet>335</a> </span><span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>callback) = <span class="self">self</span>.progress_callback {
<a href=#336 id=336 data-nosnippet>336</a> callback(<span class="self">self</span>.inner.bytes_written());
<a href=#337 id=337 data-nosnippet>337</a> }
<a href=#338 id=338 data-nosnippet>338</a>
<a href=#339 id=339 data-nosnippet>339</a> result
<a href=#340 id=340 data-nosnippet>340</a> }
<a href=#341 id=341 data-nosnippet>341</a>
<a href=#342 id=342 data-nosnippet>342</a> <span class="doccomment">/// Write serialized data with progress tracking
<a href=#343 id=343 data-nosnippet>343</a> ///
<a href=#344 id=344 data-nosnippet>344</a> /// # Type Parameters
<a href=#345 id=345 data-nosnippet>345</a> /// - `T`: Type that implements serde Serialize
<a href=#346 id=346 data-nosnippet>346</a> ///
<a href=#347 id=347 data-nosnippet>347</a> /// # Parameters
<a href=#348 id=348 data-nosnippet>348</a> /// - `data`: Data to serialize and write
<a href=#349 id=349 data-nosnippet>349</a> ///
<a href=#350 id=350 data-nosnippet>350</a> /// # Returns
<a href=#351 id=351 data-nosnippet>351</a> /// Success or error
<a href=#352 id=352 data-nosnippet>352</a> ///
<a href=#353 id=353 data-nosnippet>353</a> /// # Errors
<a href=#354 id=354 data-nosnippet>354</a> /// Returns error if serialization or writing fails
<a href=#355 id=355 data-nosnippet>355</a> </span><span class="kw">pub async fn </span>write_json_with_progress<T: serde::Serialize>(
<a href=#356 id=356 data-nosnippet>356</a> <span class="kw-2">&mut </span><span class="self">self</span>,
<a href=#357 id=357 data-nosnippet>357</a> data: <span class="kw-2">&</span>T,
<a href=#358 id=358 data-nosnippet>358</a> ) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#359 id=359 data-nosnippet>359</a> <span class="kw">let </span>json = serde_json::to_string(data)
<a href=#360 id=360 data-nosnippet>360</a> .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e))<span class="question-mark">?</span>;
<a href=#361 id=361 data-nosnippet>361</a> <span class="self">self</span>.write_with_progress(json.as_bytes()).<span class="kw">await
<a href=#362 id=362 data-nosnippet>362</a> </span>}
<a href=#363 id=363 data-nosnippet>363</a>
<a href=#364 id=364 data-nosnippet>364</a> <span class="doccomment">/// Flush all buffered data
<a href=#365 id=365 data-nosnippet>365</a> ///
<a href=#366 id=366 data-nosnippet>366</a> /// # Returns
<a href=#367 id=367 data-nosnippet>367</a> /// Success or I/O error
<a href=#368 id=368 data-nosnippet>368</a> ///
<a href=#369 id=369 data-nosnippet>369</a> /// # Errors
<a href=#370 id=370 data-nosnippet>370</a> /// Returns an I/O error if flushing the buffer fails.
<a href=#371 id=371 data-nosnippet>371</a> </span><span class="kw">pub async fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#372 id=372 data-nosnippet>372</a> <span class="self">self</span>.inner.flush().<span class="kw">await
<a href=#373 id=373 data-nosnippet>373</a> </span>}
<a href=#374 id=374 data-nosnippet>374</a>
<a href=#375 id=375 data-nosnippet>375</a> <span class="doccomment">/// Get total bytes written
<a href=#376 id=376 data-nosnippet>376</a> </span><span class="attr">#[must_use]
<a href=#377 id=377 data-nosnippet>377</a> </span><span class="kw">pub fn </span>bytes_written(<span class="kw-2">&</span><span class="self">self</span>) -> u64 {
<a href=#378 id=378 data-nosnippet>378</a> <span class="self">self</span>.inner.bytes_written()
<a href=#379 id=379 data-nosnippet>379</a> }
<a href=#380 id=380 data-nosnippet>380</a>}
<a href=#381 id=381 data-nosnippet>381</a>
<a href=#382 id=382 data-nosnippet>382</a><span class="doccomment">/// Utility function for writing to stdout asynchronously
<a href=#383 id=383 data-nosnippet>383</a>///
<a href=#384 id=384 data-nosnippet>384</a>/// # Parameters
<a href=#385 id=385 data-nosnippet>385</a>/// - `data`: Data to write to stdout
<a href=#386 id=386 data-nosnippet>386</a>///
<a href=#387 id=387 data-nosnippet>387</a>/// # Returns
<a href=#388 id=388 data-nosnippet>388</a>/// Success or I/O error
<a href=#389 id=389 data-nosnippet>389</a>///
<a href=#390 id=390 data-nosnippet>390</a>/// # Errors
<a href=#391 id=391 data-nosnippet>391</a>/// Returns error if stdout write fails
<a href=#392 id=392 data-nosnippet>392</a></span><span class="kw">pub fn </span>write_stdout_async(data: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#393 id=393 data-nosnippet>393</a> <span class="kw">use </span>std::io::Write;
<a href=#394 id=394 data-nosnippet>394</a> <span class="kw">let </span><span class="kw-2">mut </span>stdout = std::io::stdout().lock();
<a href=#395 id=395 data-nosnippet>395</a> stdout.write_all(data)<span class="question-mark">?</span>;
<a href=#396 id=396 data-nosnippet>396</a> stdout.flush()<span class="question-mark">?</span>;
<a href=#397 id=397 data-nosnippet>397</a> <span class="prelude-val">Ok</span>(())
<a href=#398 id=398 data-nosnippet>398</a>}
<a href=#399 id=399 data-nosnippet>399</a>
<a href=#400 id=400 data-nosnippet>400</a><span class="doccomment">/// Utility function for writing to stderr asynchronously
<a href=#401 id=401 data-nosnippet>401</a>///
<a href=#402 id=402 data-nosnippet>402</a>/// # Parameters
<a href=#403 id=403 data-nosnippet>403</a>/// - `data`: Data to write to stderr
<a href=#404 id=404 data-nosnippet>404</a>///
<a href=#405 id=405 data-nosnippet>405</a>/// # Returns
<a href=#406 id=406 data-nosnippet>406</a>/// Success or I/O error
<a href=#407 id=407 data-nosnippet>407</a>///
<a href=#408 id=408 data-nosnippet>408</a>/// # Errors
<a href=#409 id=409 data-nosnippet>409</a>/// Returns error if stderr write fails
<a href=#410 id=410 data-nosnippet>410</a></span><span class="kw">pub fn </span>write_stderr_async(data: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#411 id=411 data-nosnippet>411</a> <span class="kw">use </span>std::io::Write;
<a href=#412 id=412 data-nosnippet>412</a> <span class="kw">let </span><span class="kw-2">mut </span>stderr = std::io::stderr().lock();
<a href=#413 id=413 data-nosnippet>413</a> stderr.write_all(data)<span class="question-mark">?</span>;
<a href=#414 id=414 data-nosnippet>414</a> stderr.flush()<span class="question-mark">?</span>;
<a href=#415 id=415 data-nosnippet>415</a> <span class="prelude-val">Ok</span>(())
<a href=#416 id=416 data-nosnippet>416</a>}</code></pre></div></section></main></body></html>