| <!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/key_types.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>key_types.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>::cmp::Cmp; |
| <span class="kw">use </span><span class="kw">crate</span>::types::SequenceNumber; |
| |
| <span class="kw">use </span>std::cmp::Ordering; |
| <span class="kw">use </span>std::io::Write; |
| |
| <span class="kw">use </span>integer_encoding::{FixedInt, FixedIntWriter, VarInt, VarIntWriter}; |
| |
| <span class="comment">// The following typedefs are used to distinguish between the different key formats used internally |
| // by different modules. |
| |
| // TODO: At some point, convert those into actual types with conversions between them. That's a lot |
| // of boilerplate, but increases type safety. |
| |
| </span><span class="attribute">#[derive(Debug, Clone, Copy, PartialOrd, PartialEq)] |
| </span><span class="kw">pub enum </span>ValueType { |
| TypeDeletion = <span class="number">0</span>, |
| TypeValue = <span class="number">1</span>, |
| } |
| |
| <span class="doccomment">/// A MemtableKey consists of the following elements: [keylen, key, tag, (vallen, value)] where |
| /// keylen is a varint32 encoding the length of key+tag. tag is a fixed 8 bytes segment encoding |
| /// the entry type and the sequence number. vallen and value are optional components at the end. |
| </span><span class="kw">pub type </span>MemtableKey<<span class="lifetime">'a</span>> = <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]; |
| |
| <span class="doccomment">/// A UserKey is the actual key supplied by the calling application, without any internal |
| /// decorations. |
| </span><span class="kw">pub type </span>UserKey<<span class="lifetime">'a</span>> = <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]; |
| |
| <span class="doccomment">/// An InternalKey consists of [key, tag], so it's basically a MemtableKey without the initial |
| /// length specification. This type is used as item type of MemtableIterator, and as the key |
| /// type of tables. |
| </span><span class="kw">pub type </span>InternalKey<<span class="lifetime">'a</span>> = <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]; |
| |
| <span class="doccomment">/// A LookupKey is the first part of a memtable key, consisting of [keylen: varint32, key: *u8, |
| /// tag: u64] |
| /// keylen is the length of key plus 8 (for the tag; this for LevelDB compatibility) |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>LookupKey { |
| key: Vec<u8>, |
| key_offset: usize, |
| } |
| |
| <span class="kw">const </span>U64_SPACE: usize = <span class="number">8</span>; |
| |
| <span class="kw">impl </span>LookupKey { |
| <span class="kw">pub fn </span>new(k: UserKey, s: SequenceNumber) -> LookupKey { |
| LookupKey::new_full(k, s, ValueType::TypeValue) |
| } |
| |
| <span class="kw">pub fn </span>new_full(k: UserKey, s: SequenceNumber, t: ValueType) -> LookupKey { |
| <span class="kw">let </span><span class="kw-2">mut </span>key = Vec::new(); |
| <span class="kw">let </span>internal_keylen = k.len() + U64_SPACE; |
| key.resize(k.len() + internal_keylen.required_space() + U64_SPACE, <span class="number">0</span>); |
| |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = key.as_mut_slice(); |
| writer |
| .write_varint(internal_keylen) |
| .expect(<span class="string">"write to slice failed"</span>); |
| writer.write_all(k).expect(<span class="string">"write to slice failed"</span>); |
| writer |
| .write_fixedint(s << <span class="number">8 </span>| t <span class="kw">as </span>u64) |
| .expect(<span class="string">"write to slice failed"</span>); |
| } |
| |
| LookupKey { |
| key, |
| key_offset: internal_keylen.required_space(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the full memtable-formatted key. |
| </span><span class="kw">pub fn </span>memtable_key(<span class="kw-2">&</span><span class="self">self</span>) -> MemtableKey { |
| <span class="self">self</span>.key.as_slice() |
| } |
| |
| <span class="doccomment">/// Returns only the user key portion. |
| </span><span class="kw">pub fn </span>user_key(<span class="kw-2">&</span><span class="self">self</span>) -> UserKey { |
| <span class="kw-2">&</span><span class="self">self</span>.key[<span class="self">self</span>.key_offset..<span class="self">self</span>.key.len() - <span class="number">8</span>] |
| } |
| |
| <span class="doccomment">/// Returns key and tag. |
| </span><span class="kw">pub fn </span>internal_key(<span class="kw-2">&</span><span class="self">self</span>) -> InternalKey { |
| <span class="kw-2">&</span><span class="self">self</span>.key[<span class="self">self</span>.key_offset..] |
| } |
| } |
| |
| <span class="doccomment">/// Parses a tag into (type, sequence number) |
| </span><span class="kw">pub fn </span>parse_tag(tag: u64) -> (ValueType, u64) { |
| <span class="kw">let </span>seq = tag >> <span class="number">8</span>; |
| <span class="kw">let </span>typ = tag & <span class="number">0xff</span>; |
| |
| <span class="kw">match </span>typ { |
| <span class="number">0 </span>=> (ValueType::TypeDeletion, seq), |
| <span class="number">1 </span>=> (ValueType::TypeValue, seq), |
| <span class="kw">_ </span>=> (ValueType::TypeValue, seq), |
| } |
| } |
| |
| <span class="doccomment">/// A memtable key is a bytestring containing (keylen, key, tag, vallen, val). This function |
| /// builds such a key. It's called key because the underlying Map implementation will only be |
| /// concerned with keys; the value field is not used (instead, the value is encoded in the key, |
| /// and for lookups we just search for the next bigger entry). |
| /// keylen is the length of key + 8 (to account for the tag) |
| </span><span class="kw">pub fn </span>build_memtable_key(key: <span class="kw-2">&</span>[u8], value: <span class="kw-2">&</span>[u8], t: ValueType, seq: SequenceNumber) -> Vec<u8> { |
| <span class="comment">// We are using the original LevelDB approach here -- encoding key and value into the |
| // key that is used for insertion into the SkipMap. |
| // The format is: [key_size: varint32, key_data: [u8], flags: u64, value_size: varint32, |
| // value_data: [u8]] |
| |
| </span><span class="kw">let </span>keysize = key.len() + U64_SPACE; |
| <span class="kw">let </span>valsize = value.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = Vec::new(); |
| buf.resize( |
| keysize + valsize + keysize.required_space() + valsize.required_space(), |
| <span class="number">0</span>, |
| ); |
| |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = buf.as_mut_slice(); |
| writer.write_varint(keysize).expect(<span class="string">"write to slice failed"</span>); |
| writer.write_all(key).expect(<span class="string">"write to slice failed"</span>); |
| writer |
| .write_fixedint((t <span class="kw">as </span>u64) | (seq << <span class="number">8</span>)) |
| .expect(<span class="string">"write to slice failed"</span>); |
| writer.write_varint(valsize).expect(<span class="string">"write to slice failed"</span>); |
| writer.write_all(value).expect(<span class="string">"write to slice failed"</span>); |
| <span class="macro">assert_eq!</span>(writer.len(), <span class="number">0</span>); |
| } |
| buf |
| } |
| |
| <span class="doccomment">/// Parses a memtable key and returns (keylen, key offset, tag, vallen, val offset). |
| /// If the key only contains (keylen, key, tag), the vallen and val offset return values will be |
| /// meaningless. |
| </span><span class="kw">pub fn </span>parse_memtable_key(mkey: MemtableKey) -> (usize, usize, u64, usize, usize) { |
| <span class="kw">let </span>(keylen, <span class="kw-2">mut </span>i): (usize, usize) = VarInt::decode_var(<span class="kw-2">&</span>mkey); |
| <span class="kw">let </span>keyoff = i; |
| i += keylen - <span class="number">8</span>; |
| |
| <span class="kw">if </span>mkey.len() > i { |
| <span class="kw">let </span>tag = FixedInt::decode_fixed(<span class="kw-2">&</span>mkey[i..i + <span class="number">8</span>]); |
| i += <span class="number">8</span>; |
| <span class="kw">let </span>(vallen, j): (usize, usize) = VarInt::decode_var(<span class="kw-2">&</span>mkey[i..]); |
| i += j; |
| <span class="kw">let </span>valoff = i; |
| <span class="kw">return </span>(keylen - <span class="number">8</span>, keyoff, tag, vallen, valoff); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span>(keylen - <span class="number">8</span>, keyoff, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>); |
| } |
| } |
| |
| <span class="doccomment">/// cmp_memtable_key efficiently compares two memtable keys by only parsing what's actually needed. |
| </span><span class="kw">pub fn </span>cmp_memtable_key<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>>( |
| ucmp: <span class="kw-2">&</span><span class="kw">dyn </span>Cmp, |
| a: MemtableKey<<span class="lifetime">'a</span>>, |
| b: MemtableKey<<span class="lifetime">'b</span>>, |
| ) -> Ordering { |
| <span class="kw">let </span>(alen, aoff): (usize, usize) = VarInt::decode_var(<span class="kw-2">&</span>a); |
| <span class="kw">let </span>(blen, boff): (usize, usize) = VarInt::decode_var(<span class="kw-2">&</span>b); |
| <span class="kw">let </span>userkey_a = <span class="kw-2">&</span>a[aoff..aoff + alen - <span class="number">8</span>]; |
| <span class="kw">let </span>userkey_b = <span class="kw-2">&</span>b[boff..boff + blen - <span class="number">8</span>]; |
| |
| <span class="kw">match </span>ucmp.cmp(userkey_a, userkey_b) { |
| Ordering::Less => Ordering::Less, |
| Ordering::Greater => Ordering::Greater, |
| Ordering::Equal => { |
| <span class="kw">let </span>atag = FixedInt::decode_fixed(<span class="kw-2">&</span>a[aoff + alen - <span class="number">8</span>..aoff + alen]); |
| <span class="kw">let </span>btag = FixedInt::decode_fixed(<span class="kw-2">&</span>b[boff + blen - <span class="number">8</span>..boff + blen]); |
| <span class="kw">let </span>(<span class="kw">_</span>, aseq) = parse_tag(atag); |
| <span class="kw">let </span>(<span class="kw">_</span>, bseq) = parse_tag(btag); |
| |
| <span class="comment">// reverse! |
| </span>bseq.cmp(<span class="kw-2">&</span>aseq) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Parse a key in InternalKey format. |
| </span><span class="kw">pub fn </span>parse_internal_key(ikey: InternalKey) -> (ValueType, SequenceNumber, UserKey) { |
| <span class="kw">if </span>ikey.is_empty() { |
| <span class="kw">return </span>(ValueType::TypeDeletion, <span class="number">0</span>, <span class="kw-2">&</span>ikey[<span class="number">0</span>..<span class="number">0</span>]); |
| } |
| <span class="macro">assert!</span>(ikey.len() >= <span class="number">8</span>); |
| <span class="kw">let </span>(typ, seq) = parse_tag(FixedInt::decode_fixed(<span class="kw-2">&</span>ikey[ikey.len() - <span class="number">8</span>..])); |
| <span class="kw">return </span>(typ, seq, <span class="kw-2">&</span>ikey[<span class="number">0</span>..ikey.len() - <span class="number">8</span>]); |
| } |
| |
| <span class="doccomment">/// cmp_internal_key efficiently compares keys in InternalKey format by only parsing the parts that |
| /// are actually needed for a comparison. |
| </span><span class="kw">pub fn </span>cmp_internal_key<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>>( |
| ucmp: <span class="kw-2">&</span><span class="kw">dyn </span>Cmp, |
| a: InternalKey<<span class="lifetime">'a</span>>, |
| b: InternalKey<<span class="lifetime">'b</span>>, |
| ) -> Ordering { |
| <span class="kw">match </span>ucmp.cmp(<span class="kw-2">&</span>a[<span class="number">0</span>..a.len() - <span class="number">8</span>], <span class="kw-2">&</span>b[<span class="number">0</span>..b.len() - <span class="number">8</span>]) { |
| Ordering::Less => Ordering::Less, |
| Ordering::Greater => Ordering::Greater, |
| Ordering::Equal => { |
| <span class="kw">let </span>seqa = parse_tag(FixedInt::decode_fixed(<span class="kw-2">&</span>a[a.len() - <span class="number">8</span>..])).<span class="number">1</span>; |
| <span class="kw">let </span>seqb = parse_tag(FixedInt::decode_fixed(<span class="kw-2">&</span>b[b.len() - <span class="number">8</span>..])).<span class="number">1</span>; |
| <span class="comment">// reverse comparison! |
| </span>seqb.cmp(<span class="kw-2">&</span>seqa) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// truncate_to_userkey performs an in-place conversion from InternalKey to UserKey format. |
| </span><span class="kw">pub fn </span>truncate_to_userkey(ikey: <span class="kw-2">&mut </span>Vec<u8>) { |
| <span class="kw">let </span>len = ikey.len(); |
| <span class="macro">assert!</span>(len >= <span class="number">8</span>); |
| ikey.truncate(len - <span class="number">8</span>); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"enclave_unit_test"</span>)] |
| </span><span class="kw">pub mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <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_memtable_lookupkey, test_build_memtable_key,) |
| } |
| |
| <span class="kw">fn </span>test_memtable_lookupkey() { |
| <span class="kw">let </span>lk1 = LookupKey::new(<span class="string">"abcde"</span>.as_bytes(), <span class="number">123</span>); |
| <span class="kw">let </span>lk2 = LookupKey::new(<span class="string">"xyabxy"</span>.as_bytes(), <span class="number">97</span>); |
| |
| <span class="comment">// Assert correct allocation strategy |
| </span><span class="macro">assert_eq!</span>(lk1.key.len(), <span class="number">14</span>); |
| <span class="macro">assert_eq!</span>(lk1.key.capacity(), <span class="number">14</span>); |
| |
| <span class="macro">assert_eq!</span>(lk1.user_key(), <span class="string">"abcde"</span>.as_bytes()); |
| <span class="macro">assert_eq!</span>(u32::decode_var(lk1.memtable_key()), (<span class="number">13</span>, <span class="number">1</span>)); |
| <span class="macro">assert_eq!</span>( |
| lk2.internal_key(), |
| <span class="macro">vec!</span>[<span class="number">120</span>, <span class="number">121</span>, <span class="number">97</span>, <span class="number">98</span>, <span class="number">120</span>, <span class="number">121</span>, <span class="number">1</span>, <span class="number">97</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>].as_slice() |
| ); |
| } |
| |
| <span class="kw">fn </span>test_build_memtable_key() { |
| <span class="macro">assert_eq!</span>( |
| build_memtable_key( |
| <span class="string">"abc"</span>.as_bytes(), |
| <span class="string">"123"</span>.as_bytes(), |
| ValueType::TypeValue, |
| <span class="number">231 |
| </span>), |
| <span class="macro">vec!</span>[<span class="number">11</span>, <span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">1</span>, <span class="number">231</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">49</span>, <span class="number">50</span>, <span class="number">51</span>] |
| ); |
| <span class="macro">assert_eq!</span>( |
| build_memtable_key(<span class="string">""</span>.as_bytes(), <span class="string">"123"</span>.as_bytes(), ValueType::TypeValue, <span class="number">231</span>), |
| <span class="macro">vec!</span>[<span class="number">8</span>, <span class="number">1</span>, <span class="number">231</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">49</span>, <span class="number">50</span>, <span class="number">51</span>] |
| ); |
| <span class="macro">assert_eq!</span>( |
| build_memtable_key( |
| <span class="string">"abc"</span>.as_bytes(), |
| <span class="string">"123"</span>.as_bytes(), |
| ValueType::TypeDeletion, |
| <span class="number">231 |
| </span>), |
| <span class="macro">vec!</span>[<span class="number">11</span>, <span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">0</span>, <span class="number">231</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">49</span>, <span class="number">50</span>, <span class="number">51</span>] |
| ); |
| <span class="macro">assert_eq!</span>( |
| build_memtable_key( |
| <span class="string">"abc"</span>.as_bytes(), |
| <span class="string">""</span>.as_bytes(), |
| ValueType::TypeDeletion, |
| <span class="number">231 |
| </span>), |
| <span class="macro">vec!</span>[<span class="number">11</span>, <span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>, <span class="number">0</span>, <span class="number">231</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>] |
| ); |
| } |
| } |
| </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> |
