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| </pre><pre class="rust"><code><span class="kw">use </span>std::io; |
| |
| <span class="kw">use </span>serde::{Deserialize, Deserializer, Serialize}; |
| |
| <span class="kw">pub trait </span>StoreCompressor { |
| <span class="kw">fn </span>compress(<span class="kw-2">&</span><span class="self">self</span>, uncompressed: <span class="kw-2">&</span>[u8], compressed: <span class="kw-2">&mut </span>Vec<u8>) -> io::Result<()>; |
| <span class="kw">fn </span>decompress(<span class="kw-2">&</span><span class="self">self</span>, compressed: <span class="kw-2">&</span>[u8], decompressed: <span class="kw-2">&mut </span>Vec<u8>) -> io::Result<()>; |
| <span class="kw">fn </span>get_compressor_id() -> u8; |
| } |
| |
| <span class="doccomment">/// Compressor can be used on `IndexSettings` to choose |
| /// the compressor used to compress the doc store. |
| /// |
| /// The default is Lz4Block, but also depends on the enabled feature flags. |
| </span><span class="attribute">#[derive(Clone, Debug, Copy, PartialEq, Eq)] |
| </span><span class="kw">pub enum </span>Compressor { |
| <span class="doccomment">/// No compression |
| </span><span class="prelude-val">None</span>, |
| <span class="doccomment">/// Use the lz4 compressor (block format) |
| </span>Lz4, |
| <span class="doccomment">/// Use the brotli compressor |
| </span>Brotli, |
| <span class="doccomment">/// Use the snap compressor |
| </span>Snappy, |
| <span class="doccomment">/// Use the zstd compressor |
| </span>Zstd(ZstdCompressor), |
| } |
| |
| <span class="kw">impl </span>Serialize <span class="kw">for </span>Compressor { |
| <span class="kw">fn </span>serialize<S>(<span class="kw-2">&</span><span class="self">self</span>, serializer: S) -> <span class="prelude-ty">Result</span><S::Ok, S::Error> |
| <span class="kw">where </span>S: serde::Serializer { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Compressor::None => serializer.serialize_str(<span class="string">"none"</span>), |
| Compressor::Lz4 => serializer.serialize_str(<span class="string">"lz4"</span>), |
| Compressor::Brotli => serializer.serialize_str(<span class="string">"brotli"</span>), |
| Compressor::Snappy => serializer.serialize_str(<span class="string">"snappy"</span>), |
| Compressor::Zstd(zstd) => serializer.serialize_str(<span class="kw-2">&</span>zstd.ser_to_string()), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>> Deserialize<<span class="lifetime">'de</span>> <span class="kw">for </span>Compressor { |
| <span class="kw">fn </span>deserialize<D>(deserializer: D) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, D::Error> |
| <span class="kw">where </span>D: Deserializer<<span class="lifetime">'de</span>> { |
| <span class="kw">let </span>buf = String::deserialize(deserializer)<span class="question-mark">?</span>; |
| <span class="kw">let </span>compressor = <span class="kw">match </span>buf.as_str() { |
| <span class="string">"none" </span>=> Compressor::None, |
| <span class="string">"lz4" </span>=> Compressor::Lz4, |
| <span class="string">"brotli" </span>=> Compressor::Brotli, |
| <span class="string">"snappy" </span>=> Compressor::Snappy, |
| <span class="kw">_ </span>=> { |
| <span class="kw">if </span>buf.starts_with(<span class="string">"zstd"</span>) { |
| Compressor::Zstd( |
| ZstdCompressor::deser_from_str(<span class="kw-2">&</span>buf).map_err(serde::de::Error::custom)<span class="question-mark">?</span>, |
| ) |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(serde::de::Error::unknown_variant( |
| <span class="kw-2">&</span>buf, |
| <span class="kw-2">&</span>[ |
| <span class="string">"none"</span>, |
| <span class="string">"lz4"</span>, |
| <span class="string">"brotli"</span>, |
| <span class="string">"snappy"</span>, |
| <span class="string">"zstd"</span>, |
| <span class="string">"zstd(compression_level=5)"</span>, |
| ], |
| )); |
| } |
| } |
| }; |
| |
| <span class="prelude-val">Ok</span>(compressor) |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Default, Debug, Copy, PartialEq, Eq, Serialize, Deserialize)] |
| </span><span class="doccomment">/// The Zstd compressor, with optional compression level. |
| </span><span class="kw">pub struct </span>ZstdCompressor { |
| <span class="doccomment">/// The compression level, if unset defaults to zstd::DEFAULT_COMPRESSION_LEVEL = 3 |
| </span><span class="kw">pub </span>compression_level: <span class="prelude-ty">Option</span><i32>, |
| } |
| |
| <span class="kw">impl </span>ZstdCompressor { |
| <span class="kw">fn </span>deser_from_str(val: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><ZstdCompressor, String> { |
| <span class="kw">if </span>!val.starts_with(<span class="string">"zstd"</span>) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"needs to start with zstd, but got {}"</span>, val)); |
| } |
| <span class="kw">if </span>val == <span class="string">"zstd" </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(ZstdCompressor::default()); |
| } |
| <span class="kw">let </span>options = <span class="kw-2">&</span>val[<span class="string">"zstd"</span>.len() + <span class="number">1</span>..val.len() - <span class="number">1</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>compressor = ZstdCompressor::default(); |
| <span class="kw">for </span>option <span class="kw">in </span>options.split(<span class="string">','</span>) { |
| <span class="kw">let </span>(opt_name, value) = options |
| .split_once(<span class="string">'='</span>) |
| .ok_or_else(|| <span class="macro">format!</span>(<span class="string">"no '=' found in option {:?}"</span>, option))<span class="question-mark">?</span>; |
| |
| <span class="kw">match </span>opt_name { |
| <span class="string">"compression_level" </span>=> { |
| <span class="kw">let </span>value = value.parse::<i32>().map_err(|err| { |
| <span class="macro">format!</span>( |
| <span class="string">"Could not parse value {} of option {}, e: {}"</span>, |
| value, opt_name, err |
| ) |
| })<span class="question-mark">?</span>; |
| <span class="kw">if </span>value >= <span class="number">15 </span>{ |
| <span class="macro">warn!</span>( |
| <span class="string">"High zstd compression level detected: {:?}. High compression levels \ |
| (>=15) are slow and will limit indexing speed."</span>, |
| value |
| ) |
| } |
| compressor.compression_level = <span class="prelude-val">Some</span>(value); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"unknown zstd option {:?}"</span>, opt_name)); |
| } |
| } |
| } |
| <span class="prelude-val">Ok</span>(compressor) |
| } |
| <span class="kw">fn </span>ser_to_string(<span class="kw-2">&</span><span class="self">self</span>) -> String { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(compression_level) = <span class="self">self</span>.compression_level { |
| <span class="macro">format!</span>(<span class="string">"zstd(compression_level={})"</span>, compression_level) |
| } <span class="kw">else </span>{ |
| <span class="string">"zstd"</span>.to_string() |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>Compressor { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="kw">if </span><span class="macro">cfg!</span>(feature = <span class="string">"lz4-compression"</span>) { |
| Compressor::Lz4 |
| } <span class="kw">else if </span><span class="macro">cfg!</span>(feature = <span class="string">"brotli-compression"</span>) { |
| Compressor::Brotli |
| } <span class="kw">else if </span><span class="macro">cfg!</span>(feature = <span class="string">"snappy-compression"</span>) { |
| Compressor::Snappy |
| } <span class="kw">else if </span><span class="macro">cfg!</span>(feature = <span class="string">"zstd-compression"</span>) { |
| Compressor::Zstd(ZstdCompressor::default()) |
| } <span class="kw">else </span>{ |
| Compressor::None |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Compressor { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>compress_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| uncompressed: <span class="kw-2">&</span>[u8], |
| compressed: <span class="kw-2">&mut </span>Vec<u8>, |
| ) -> io::Result<()> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="self">Self</span>::None => { |
| compressed.clear(); |
| compressed.extend_from_slice(uncompressed); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="self">Self</span>::Lz4 => { |
| <span class="attribute">#[cfg(feature = <span class="string">"lz4-compression"</span>)] |
| </span>{ |
| <span class="kw">super</span>::compression_lz4_block::compress(uncompressed, compressed) |
| } |
| <span class="attribute">#[cfg(not(feature = <span class="string">"lz4-compression"</span>))] |
| </span>{ |
| <span class="macro">panic!</span>(<span class="string">"lz4-compression feature flag not activated"</span>); |
| } |
| } |
| <span class="self">Self</span>::Brotli => { |
| <span class="attribute">#[cfg(feature = <span class="string">"brotli-compression"</span>)] |
| </span>{ |
| <span class="kw">super</span>::compression_brotli::compress(uncompressed, compressed) |
| } |
| <span class="attribute">#[cfg(not(feature = <span class="string">"brotli-compression"</span>))] |
| </span>{ |
| <span class="macro">panic!</span>(<span class="string">"brotli-compression-compression feature flag not activated"</span>); |
| } |
| } |
| <span class="self">Self</span>::Snappy => { |
| <span class="attribute">#[cfg(feature = <span class="string">"snappy-compression"</span>)] |
| </span>{ |
| <span class="kw">super</span>::compression_snap::compress(uncompressed, compressed) |
| } |
| <span class="attribute">#[cfg(not(feature = <span class="string">"snappy-compression"</span>))] |
| </span>{ |
| <span class="macro">panic!</span>(<span class="string">"snappy-compression feature flag not activated"</span>); |
| } |
| } |
| <span class="self">Self</span>::Zstd(_zstd_compressor) => { |
| <span class="attribute">#[cfg(feature = <span class="string">"zstd-compression"</span>)] |
| </span>{ |
| <span class="kw">super</span>::compression_zstd_block::compress( |
| uncompressed, |
| compressed, |
| _zstd_compressor.compression_level, |
| ) |
| } |
| <span class="attribute">#[cfg(not(feature = <span class="string">"zstd-compression"</span>))] |
| </span>{ |
| <span class="macro">panic!</span>(<span class="string">"zstd-compression feature flag not activated"</span>); |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>zstd_serde_roundtrip() { |
| <span class="kw">let </span>compressor = ZstdCompressor { |
| compression_level: <span class="prelude-val">Some</span>(<span class="number">15</span>), |
| }; |
| |
| <span class="macro">assert_eq!</span>( |
| ZstdCompressor::deser_from_str(<span class="kw-2">&</span>compressor.ser_to_string()).unwrap(), |
| compressor |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| ZstdCompressor::deser_from_str(<span class="kw-2">&</span>ZstdCompressor::default().ser_to_string()).unwrap(), |
| ZstdCompressor::default() |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>deser_zstd_test() { |
| <span class="macro">assert_eq!</span>( |
| ZstdCompressor::deser_from_str(<span class="string">"zstd"</span>).unwrap(), |
| ZstdCompressor::default() |
| ); |
| |
| <span class="macro">assert!</span>(ZstdCompressor::deser_from_str(<span class="string">"zzstd"</span>).is_err()); |
| <span class="macro">assert!</span>(ZstdCompressor::deser_from_str(<span class="string">"zzstd()"</span>).is_err()); |
| <span class="macro">assert_eq!</span>( |
| ZstdCompressor::deser_from_str(<span class="string">"zstd(compression_level=15)"</span>).unwrap(), |
| ZstdCompressor { |
| compression_level: <span class="prelude-val">Some</span>(<span class="number">15</span>) |
| } |
| ); |
| <span class="macro">assert_eq!</span>( |
| ZstdCompressor::deser_from_str(<span class="string">"zstd(compresion_level=15)"</span>).unwrap_err(), |
| <span class="string">"unknown zstd option \"compresion_level\"" |
| </span>); |
| <span class="macro">assert_eq!</span>( |
| ZstdCompressor::deser_from_str(<span class="string">"zstd(compression_level->2)"</span>).unwrap_err(), |
| <span class="string">"no '=' found in option \"compression_level->2\"" |
| </span>); |
| <span class="macro">assert_eq!</span>( |
| ZstdCompressor::deser_from_str(<span class="string">"zstd(compression_level=over9000)"</span>).unwrap_err(), |
| <span class="string">"Could not parse value over9000 of option compression_level, e: invalid digit found \ |
| in string" |
| </span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |