| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `common/rusty_leveldb_sgx/src/filter_block.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>filter_block.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../rusty_leveldb/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../rusty_leveldb/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::block::BlockContents; |
| <span class="kw">use </span><span class="kw">crate</span>::filter::BoxedFilterPolicy; |
| |
| <span class="kw">use </span>std::rc::Rc; |
| |
| <span class="kw">use </span>integer_encoding::FixedInt; |
| |
| <span class="kw">const </span>FILTER_BASE_LOG2: u32 = <span class="number">11</span>; |
| <span class="kw">const </span>FILTER_BASE: u32 = <span class="number">1 </span><< FILTER_BASE_LOG2; <span class="comment">// 2 KiB |
| |
| </span><span class="doccomment">/// For a given byte offset, returns the index of the filter that includes the key at that offset. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_filter_index(offset: usize, base_lg2: u32) -> u32 { |
| <span class="comment">// divide by 2048 |
| </span>(offset >> base_lg2 <span class="kw">as </span>usize) <span class="kw">as </span>u32 |
| } |
| |
| <span class="doccomment">/// A Filter Block is built like this: |
| /// |
| /// [filter0, filter1, filter2, ..., offset of filter0, offset of filter1, ..., offset of offsets |
| /// array, log2 of FILTER_BASE] |
| /// |
| /// where offsets are 4 bytes, offset of offsets is 4 bytes, and log2 of FILTER_BASE is 1 byte. |
| /// Two consecutive filter offsets may be the same. |
| </span><span class="kw">pub struct </span>FilterBlockBuilder { |
| policy: BoxedFilterPolicy, |
| <span class="comment">// filters, concatenated |
| </span>filters: Vec<u8>, |
| filter_offsets: Vec<usize>, |
| |
| <span class="comment">// Reset on every start_block() |
| </span>key_offsets: Vec<usize>, |
| keys: Vec<u8>, |
| } |
| |
| <span class="kw">impl </span>FilterBlockBuilder { |
| <span class="kw">pub fn </span>new(fp: BoxedFilterPolicy) -> FilterBlockBuilder { |
| FilterBlockBuilder { |
| policy: fp, |
| <span class="comment">// some pre-allocation |
| </span>filters: Vec::with_capacity(<span class="number">1024</span>), |
| filter_offsets: Vec::with_capacity(<span class="number">1024</span>), |
| key_offsets: Vec::with_capacity(<span class="number">1024</span>), |
| keys: Vec::with_capacity(<span class="number">1024</span>), |
| } |
| } |
| |
| <span class="kw">pub fn </span>size_estimate(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.filters.len() + <span class="number">4 </span>* <span class="self">self</span>.filter_offsets.len() + <span class="number">4 </span>+ <span class="number">1 |
| </span>} |
| |
| <span class="kw">pub fn </span>filter_name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'static </span>str { |
| <span class="self">self</span>.policy.name() |
| } |
| |
| <span class="kw">pub fn </span>add_key(<span class="kw-2">&mut </span><span class="self">self</span>, key: <span class="kw-2">&</span>[u8]) { |
| <span class="self">self</span>.key_offsets.push(<span class="self">self</span>.keys.len()); |
| <span class="self">self</span>.keys.extend_from_slice(key); |
| } |
| |
| <span class="kw">pub fn </span>start_block(<span class="kw-2">&mut </span><span class="self">self</span>, offset: usize) { |
| <span class="kw">let </span>filter_ix = get_filter_index(offset, FILTER_BASE_LOG2); |
| <span class="macro">assert!</span>(filter_ix >= <span class="self">self</span>.filter_offsets.len() <span class="kw">as </span>u32); |
| |
| <span class="kw">while </span>filter_ix > <span class="self">self</span>.filter_offsets.len() <span class="kw">as </span>u32 { |
| <span class="self">self</span>.generate_filter(); |
| } |
| } |
| |
| <span class="kw">fn </span>generate_filter(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.filter_offsets.push(<span class="self">self</span>.filters.len()); |
| <span class="kw">if </span><span class="self">self</span>.keys.is_empty() { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">let </span>filter = <span class="self">self</span>.policy.create_filter(<span class="kw-2">&</span><span class="self">self</span>.keys, <span class="kw-2">&</span><span class="self">self</span>.key_offsets); |
| <span class="self">self</span>.filters.extend_from_slice(<span class="kw-2">&</span>filter); |
| |
| <span class="self">self</span>.keys.clear(); |
| <span class="self">self</span>.key_offsets.clear(); |
| } |
| |
| <span class="kw">pub fn </span>finish(<span class="kw-2">mut </span><span class="self">self</span>) -> Vec<u8> { |
| <span class="kw">if </span>!<span class="self">self</span>.keys.is_empty() { |
| <span class="self">self</span>.generate_filter(); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>result = <span class="self">self</span>.filters; |
| <span class="kw">let </span>offsets_offset = result.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>ix = result.len(); |
| result.resize(ix + <span class="number">4 </span>* <span class="self">self</span>.filter_offsets.len() + <span class="number">5</span>, <span class="number">0</span>); |
| |
| <span class="comment">// Put filter offsets at the end |
| </span><span class="kw">for </span>offset <span class="kw">in </span><span class="self">self</span>.filter_offsets.into_iter() { |
| (offset <span class="kw">as </span>u32).encode_fixed(<span class="kw-2">&mut </span>result[ix..ix + <span class="number">4</span>]); |
| ix += <span class="number">4</span>; |
| } |
| |
| (offsets_offset <span class="kw">as </span>u32).encode_fixed(<span class="kw-2">&mut </span>result[ix..ix + <span class="number">4</span>]); |
| ix += <span class="number">4</span>; |
| result[ix] = FILTER_BASE_LOG2 <span class="kw">as </span>u8; |
| |
| result |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>FilterBlockReader { |
| policy: BoxedFilterPolicy, |
| block: Rc<BlockContents>, |
| |
| offsets_offset: usize, |
| filter_base_lg2: u32, |
| } |
| |
| <span class="kw">impl </span>FilterBlockReader { |
| <span class="kw">pub fn </span>new_owned(pol: BoxedFilterPolicy, data: Vec<u8>) -> FilterBlockReader { |
| FilterBlockReader::new(pol, Rc::new(data)) |
| } |
| |
| <span class="kw">pub fn </span>new(pol: BoxedFilterPolicy, data: Rc<Vec<u8>>) -> FilterBlockReader { |
| <span class="macro">assert!</span>(data.len() >= <span class="number">5</span>); |
| |
| <span class="kw">let </span>fbase = data[data.len() - <span class="number">1</span>] <span class="kw">as </span>u32; |
| <span class="kw">let </span>offset = u32::decode_fixed(<span class="kw-2">&</span>data[data.len() - <span class="number">5</span>..data.len() - <span class="number">1</span>]) <span class="kw">as </span>usize; |
| |
| FilterBlockReader { |
| policy: pol, |
| block: data, |
| filter_base_lg2: fbase, |
| offsets_offset: offset, |
| } |
| } |
| |
| <span class="doccomment">/// Returns number of filters |
| </span><span class="kw">pub fn </span>num(<span class="kw-2">&</span><span class="self">self</span>) -> u32 { |
| ((<span class="self">self</span>.block.len() - <span class="self">self</span>.offsets_offset - <span class="number">5</span>) / <span class="number">4</span>) <span class="kw">as </span>u32 |
| } |
| |
| <span class="doccomment">/// Returns the offset of the offset with index i. |
| </span><span class="kw">fn </span>offset_of(<span class="kw-2">&</span><span class="self">self</span>, i: u32) -> usize { |
| <span class="kw">let </span>offset_offset = <span class="self">self</span>.offsets_offset + <span class="number">4 </span>* i <span class="kw">as </span>usize; |
| u32::decode_fixed(<span class="kw-2">&</span><span class="self">self</span>.block[offset_offset..offset_offset + <span class="number">4</span>]) <span class="kw">as </span>usize |
| } |
| |
| <span class="doccomment">/// blk_offset is the offset of the block containing key. Returns whether the key matches the |
| /// filter for the block at blk_offset. |
| </span><span class="kw">pub fn </span>key_may_match(<span class="kw-2">&</span><span class="self">self</span>, blk_offset: usize, key: <span class="kw-2">&</span>[u8]) -> bool { |
| <span class="kw">if </span>get_filter_index(blk_offset, <span class="self">self</span>.filter_base_lg2) > <span class="self">self</span>.num() { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">let </span>filter_begin = <span class="self">self</span>.offset_of(get_filter_index(blk_offset, <span class="self">self</span>.filter_base_lg2)); |
| <span class="kw">let </span>filter_end = <span class="self">self</span>.offset_of(get_filter_index(blk_offset, <span class="self">self</span>.filter_base_lg2) + <span class="number">1</span>); |
| |
| <span class="macro">assert!</span>(filter_begin < filter_end); |
| <span class="macro">assert!</span>(filter_end <= <span class="self">self</span>.offsets_offset); |
| |
| <span class="self">self</span>.policy |
| .key_may_match(key, <span class="kw-2">&</span><span class="self">self</span>.block[filter_begin..filter_end]) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"enclave_unit_test"</span>)] |
| </span><span class="kw">pub mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::get_filter_index; |
| <span class="kw">use </span><span class="kw">super</span>::FILTER_BASE_LOG2; |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::filter::BloomPolicy; |
| <span class="kw">use </span>teaclave_test_utils::<span class="kw-2">*</span>; |
| |
| <span class="kw">pub fn </span>run_tests() -> bool { |
| <span class="macro">run_tests!</span>( |
| test_filter_index, |
| test_filter_block_builder, |
| test_filter_block_build_read, |
| ) |
| } |
| |
| <span class="kw">fn </span>test_filter_index() { |
| <span class="macro">assert_eq!</span>(get_filter_index(<span class="number">3777</span>, FILTER_BASE_LOG2), <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(get_filter_index(<span class="number">10000</span>, FILTER_BASE_LOG2), <span class="number">4</span>); |
| } |
| |
| <span class="kw">fn </span>get_keys() -> Vec<<span class="kw-2">&</span><span class="lifetime">'static </span>[u8]> { |
| <span class="macro">vec!</span>[ |
| <span class="string">"abcd"</span>.as_bytes(), |
| <span class="string">"efgh"</span>.as_bytes(), |
| <span class="string">"ijkl"</span>.as_bytes(), |
| <span class="string">"mnopqrstuvwxyz"</span>.as_bytes(), |
| ] |
| } |
| |
| <span class="kw">fn </span>produce_filter_block() -> Vec<u8> { |
| <span class="kw">let </span>keys = get_keys(); |
| <span class="kw">let </span><span class="kw-2">mut </span>bld = FilterBlockBuilder::new(Rc::new(Box::new(BloomPolicy::new(<span class="number">32</span>)))); |
| |
| bld.start_block(<span class="number">0</span>); |
| |
| <span class="kw">for </span>k <span class="kw">in </span>keys.iter() { |
| bld.add_key(k); |
| } |
| |
| <span class="comment">// second block |
| </span>bld.start_block(<span class="number">5000</span>); |
| |
| <span class="kw">for </span>k <span class="kw">in </span>keys.iter() { |
| bld.add_key(k); |
| } |
| |
| bld.finish() |
| } |
| |
| <span class="kw">fn </span>test_filter_block_builder() { |
| <span class="kw">let </span>result = produce_filter_block(); |
| <span class="comment">// 2 blocks of 4 filters of 4 bytes plus 1B for `k`; plus three filter offsets (because of |
| // the block offsets of 0 and 5000); plus footer |
| </span><span class="macro">assert_eq!</span>(result.len(), <span class="number">2 </span>* (get_keys().len() * <span class="number">4 </span>+ <span class="number">1</span>) + (<span class="number">3 </span>* <span class="number">4</span>) + <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>( |
| result, |
| <span class="macro">vec!</span>[ |
| <span class="number">234</span>, <span class="number">195</span>, <span class="number">25</span>, <span class="number">155</span>, <span class="number">61</span>, <span class="number">141</span>, <span class="number">173</span>, <span class="number">140</span>, <span class="number">221</span>, <span class="number">28</span>, <span class="number">222</span>, <span class="number">92</span>, <span class="number">220</span>, <span class="number">112</span>, <span class="number">234</span>, <span class="number">227</span>, <span class="number">22</span>, |
| <span class="number">234</span>, <span class="number">195</span>, <span class="number">25</span>, <span class="number">155</span>, <span class="number">61</span>, <span class="number">141</span>, <span class="number">173</span>, <span class="number">140</span>, <span class="number">221</span>, <span class="number">28</span>, <span class="number">222</span>, <span class="number">92</span>, <span class="number">220</span>, <span class="number">112</span>, <span class="number">234</span>, <span class="number">227</span>, <span class="number">22</span>, <span class="number">0</span>, |
| <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">17</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">17</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">34</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">11</span>, |
| ] |
| ); |
| } |
| |
| <span class="kw">fn </span>test_filter_block_build_read() { |
| <span class="kw">let </span>result = produce_filter_block(); |
| <span class="kw">let </span>reader = FilterBlockReader::new_owned(Rc::new(Box::new(BloomPolicy::new(<span class="number">32</span>))), result); |
| |
| <span class="macro">assert_eq!</span>( |
| reader.offset_of(get_filter_index(<span class="number">5121</span>, FILTER_BASE_LOG2)), |
| <span class="number">17 |
| </span>); <span class="comment">// third block in third filter |
| |
| </span><span class="kw">let </span>unknown_keys = <span class="macro">vec!</span>[ |
| <span class="string">"xsb"</span>.as_bytes(), |
| <span class="string">"9sad"</span>.as_bytes(), |
| <span class="string">"assssaaaass"</span>.as_bytes(), |
| ]; |
| |
| <span class="kw">for </span>block_offset <span class="kw">in </span><span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1024</span>, <span class="number">5000</span>, <span class="number">6025</span>].into_iter() { |
| <span class="kw">for </span>key <span class="kw">in </span>get_keys().iter() { |
| <span class="macro">assert!</span>( |
| reader.key_may_match(block_offset, key), |
| <span class="string">"{} {:?} "</span>, |
| block_offset, |
| key |
| ); |
| } |
| <span class="kw">for </span>key <span class="kw">in </span>unknown_keys.iter() { |
| <span class="macro">assert!</span>(!reader.key_may_match(block_offset, key)); |
| } |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rusty_leveldb" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
