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annotate rust/hg-core/src/revlog/revlog.rs @ 45604:900b9b79b99c

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hg-core: make `Index` owner of its bytes (D8958#inline-14994 followup 1/2) Prevent building `Index` every time it is needed. It was a bad idea anyway. When `Index::new` will return `Result` it will avoid things like `Revlog::len` returning `Result<usize>` instead of `usize`. [X] make `Index` owner of its bytes [ ] make `Index::new` return an error if `offset != bytes.len()` Differential Revision: https://phab.mercurial-scm.org/D9106
author Antoine cezar<acezar@chwitlabs.fr>
date Mon, 28 Sep 2020 15:13:51 +0200
parents 497657895b54
children 1cef583541c0
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1 use std::borrow::Cow;
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2 use std::fs::File;
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3 use std::io::Read;
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4 use std::ops::Deref;
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5 use std::path::Path;
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6
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7 use byteorder::{BigEndian, ByteOrder};
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8 use crypto::digest::Digest;
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9 use crypto::sha1::Sha1;
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10 use flate2::read::ZlibDecoder;
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11 use memmap::{Mmap, MmapOptions};
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12 use micro_timer::timed;
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13 use zstd;
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14
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15 use super::index::Index;
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16 use super::node::{NODE_BYTES_LENGTH, NULL_NODE_ID};
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17 use super::patch;
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18 use crate::revlog::Revision;
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19
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20 pub enum RevlogError {
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21 IoError(std::io::Error),
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22 UnsuportedVersion(u16),
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23 InvalidRevision,
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24 Corrupted,
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25 UnknowDataFormat(u8),
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26 }
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27
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28 fn mmap_open(path: &Path) -> Result<Mmap, std::io::Error> {
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29 let file = File::open(path)?;
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30 let mmap = unsafe { MmapOptions::new().map(&file) }?;
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31 Ok(mmap)
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32 }
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33
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34 /// Read only implementation of revlog.
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35 pub struct Revlog {
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36 /// When index and data are not interleaved: bytes of the revlog index.
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37 /// When index and data are interleaved: bytes of the revlog index and
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38 /// data.
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39 index: Index,
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40 /// When index and data are not interleaved: bytes of the revlog data
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41 data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>>,
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42 }
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43
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44 impl Revlog {
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45 /// Open a revlog index file.
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46 ///
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47 /// It will also open the associated data file if index and data are not
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48 /// interleaved.
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49 #[timed]
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50 pub fn open(index_path: &Path) -> Result<Self, RevlogError> {
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51 let index_mmap =
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52 mmap_open(&index_path).map_err(RevlogError::IoError)?;
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53
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54 let version = get_version(&index_mmap);
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55 if version != 1 {
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56 return Err(RevlogError::UnsuportedVersion(version));
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57 }
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58
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59 let index = Index::new(Box::new(index_mmap));
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60
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61 // TODO load data only when needed //
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62 // type annotation required
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63 // won't recognize Mmap as Deref<Target = [u8]>
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64 let data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>> =
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65 if index.is_inline() {
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66 None
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67 } else {
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68 let data_path = index_path.with_extension("d");
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69 let data_mmap =
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70 mmap_open(&data_path).map_err(RevlogError::IoError)?;
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71 Some(Box::new(data_mmap))
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72 };
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73
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74 Ok(Revlog { index, data_bytes })
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75 }
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76
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77 /// Return number of entries of the `Revlog`.
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78 pub fn len(&self) -> usize {
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79 self.index.len()
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80 }
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81
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82 /// Returns `true` if the `Revlog` has zero `entries`.
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83 pub fn is_empty(&self) -> bool {
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84 self.index.is_empty()
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85 }
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86
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87 /// Return the full data associated to a node.
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88 #[timed]
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89 pub fn get_node_rev(&self, node: &[u8]) -> Result<Revision, RevlogError> {
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90 // This is brute force. But it is fast enough for now.
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91 // Optimization will come later.
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92 for rev in (0..self.len() as Revision).rev() {
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93 let index_entry =
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94 self.index.get_entry(rev).ok_or(RevlogError::Corrupted)?;
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95 if node == index_entry.hash() {
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96 return Ok(rev);
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97 }
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98 }
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99 Err(RevlogError::InvalidRevision)
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100 }
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101
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102 /// Return the full data associated to a revision.
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103 ///
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104 /// All entries required to build the final data out of deltas will be
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105 /// retrieved as needed, and the deltas will be applied to the inital
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106 /// snapshot to rebuild the final data.
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107 #[timed]
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108 pub fn get_rev_data(&self, rev: Revision) -> Result<Vec<u8>, RevlogError> {
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109 // Todo return -> Cow
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110 let mut entry = self.get_entry(rev)?;
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111 let mut delta_chain = vec![];
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112 while let Some(base_rev) = entry.base_rev {
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113 delta_chain.push(entry);
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114 entry = self
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115 .get_entry(base_rev)
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116 .map_err(|_| RevlogError::Corrupted)?;
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117 }
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118
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119 // TODO do not look twice in the index
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120 let index_entry = self
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121 .index
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122 .get_entry(rev)
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123 .ok_or(RevlogError::InvalidRevision)?;
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124
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125 let data: Vec<u8> = if delta_chain.is_empty() {
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126 entry.data()?.into()
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127 } else {
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128 Revlog::build_data_from_deltas(entry, &delta_chain)?
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129 };
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130
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131 if self.check_hash(
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132 index_entry.p1(),
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133 index_entry.p2(),
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134 index_entry.hash(),
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135 &data,
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136 ) {
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137 Ok(data)
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138 } else {
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139 Err(RevlogError::Corrupted)
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140 }
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141 }
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142
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143 /// Check the hash of some given data against the recorded hash.
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144 pub fn check_hash(
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145 &self,
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146 p1: Revision,
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147 p2: Revision,
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148 expected: &[u8],
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149 data: &[u8],
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150 ) -> bool {
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151 let e1 = self.index.get_entry(p1);
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152 let h1 = match e1 {
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153 Some(ref entry) => entry.hash(),
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154 None => &NULL_NODE_ID,
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155 };
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156 let e2 = self.index.get_entry(p2);
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157 let h2 = match e2 {
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158 Some(ref entry) => entry.hash(),
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159 None => &NULL_NODE_ID,
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160 };
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161
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162 hash(data, &h1, &h2).as_slice() == expected
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163 }
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164
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165 /// Build the full data of a revision out its snapshot
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166 /// and its deltas.
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167 #[timed]
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168 fn build_data_from_deltas(
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169 snapshot: RevlogEntry,
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170 deltas: &[RevlogEntry],
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171 ) -> Result<Vec<u8>, RevlogError> {
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172 let snapshot = snapshot.data()?;
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173 let deltas = deltas
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174 .iter()
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175 .rev()
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176 .map(RevlogEntry::data)
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177 .collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?;
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178 let patches: Vec<_> =
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179 deltas.iter().map(|d| patch::PatchList::new(d)).collect();
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180 let patch = patch::fold_patch_lists(&patches);
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181 Ok(patch.apply(&snapshot))
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182 }
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183
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184 /// Return the revlog data.
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185 fn data(&self) -> &[u8] {
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186 match self.data_bytes {
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187 Some(ref data_bytes) => &data_bytes,
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188 None => panic!(
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189 "forgot to load the data or trying to access inline data"
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190 ),
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191 }
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192 }
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193
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194 /// Get an entry of the revlog.
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195 fn get_entry(&self, rev: Revision) -> Result<RevlogEntry, RevlogError> {
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196 let index_entry = self
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197 .index
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198 .get_entry(rev)
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199 .ok_or(RevlogError::InvalidRevision)?;
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200 let start = index_entry.offset();
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201 let end = start + index_entry.compressed_len();
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202 let data = if self.index.is_inline() {
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203 self.index.data(start, end)
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204 } else {
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205 &self.data()[start..end]
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206 };
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207 let entry = RevlogEntry {
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208 rev,
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209 bytes: data,
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210 compressed_len: index_entry.compressed_len(),
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211 uncompressed_len: index_entry.uncompressed_len(),
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212 base_rev: if index_entry.base_revision() == rev {
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213 None
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214 } else {
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215 Some(index_entry.base_revision())
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216 },
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217 };
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218 Ok(entry)
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219 }
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220 }
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221
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222 /// The revlog entry's bytes and the necessary informations to extract
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223 /// the entry's data.
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224 #[derive(Debug)]
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225 pub struct RevlogEntry<'a> {
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226 rev: Revision,
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227 bytes: &'a [u8],
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228 compressed_len: usize,
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229 uncompressed_len: usize,
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230 base_rev: Option<Revision>,
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231 }
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232
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233 impl<'a> RevlogEntry<'a> {
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234 /// Extract the data contained in the entry.
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235 pub fn data(&self) -> Result<Cow<'_, [u8]>, RevlogError> {
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236 if self.bytes.is_empty() {
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237 return Ok(Cow::Borrowed(&[]));
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238 }
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239 match self.bytes[0] {
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240 // Revision data is the entirety of the entry, including this
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241 // header.
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242 b'\0' => Ok(Cow::Borrowed(self.bytes)),
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243 // Raw revision data follows.
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244 b'u' => Ok(Cow::Borrowed(&self.bytes[1..])),
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245 // zlib (RFC 1950) data.
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246 b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data()?)),
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247 // zstd data.
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248 b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data()?)),
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249 format_type => Err(RevlogError::UnknowDataFormat(format_type)),
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250 }
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251 }
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252
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253 fn uncompressed_zlib_data(&self) -> Result<Vec<u8>, RevlogError> {
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254 let mut decoder = ZlibDecoder::new(self.bytes);
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255 if self.is_delta() {
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256 let mut buf = Vec::with_capacity(self.compressed_len);
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257 decoder
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258 .read_to_end(&mut buf)
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259 .or(Err(RevlogError::Corrupted))?;
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260 Ok(buf)
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261 } else {
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262 let mut buf = vec![0; self.uncompressed_len];
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263 decoder
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264 .read_exact(&mut buf)
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265 .or(Err(RevlogError::Corrupted))?;
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266 Ok(buf)
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267 }
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268 }
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269
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270 fn uncompressed_zstd_data(&self) -> Result<Vec<u8>, RevlogError> {
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271 if self.is_delta() {
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272 let mut buf = Vec::with_capacity(self.compressed_len);
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273 zstd::stream::copy_decode(self.bytes, &mut buf)
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274 .or(Err(RevlogError::Corrupted))?;
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275 Ok(buf)
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276 } else {
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277 let mut buf = vec![0; self.uncompressed_len];
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278 let len = zstd::block::decompress_to_buffer(self.bytes, &mut buf)
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279 .or(Err(RevlogError::Corrupted))?;
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280 if len != self.uncompressed_len {
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281 Err(RevlogError::Corrupted)
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282 } else {
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283 Ok(buf)
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284 }
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285 }
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286 }
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287
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288 /// Tell if the entry is a snapshot or a delta
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289 /// (influences on decompression).
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290 fn is_delta(&self) -> bool {
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291 self.base_rev.is_some()
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292 }
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293 }
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294
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295 /// Format version of the revlog.
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296 pub fn get_version(index_bytes: &[u8]) -> u16 {
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297 BigEndian::read_u16(&index_bytes[2..=3])
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298 }
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299
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300 /// Calculate the hash of a revision given its data and its parents.
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301 fn hash(data: &[u8], p1_hash: &[u8], p2_hash: &[u8]) -> Vec<u8> {
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302 let mut hasher = Sha1::new();
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303 let (a, b) = (p1_hash, p2_hash);
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304 if a > b {
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305 hasher.input(b);
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306 hasher.input(a);
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307 } else {
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308 hasher.input(a);
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309 hasher.input(b);
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310 }
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311 hasher.input(data);
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312 let mut hash = vec![0; NODE_BYTES_LENGTH];
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313 hasher.result(&mut hash);
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314 hash
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315 }
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316
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317 #[cfg(test)]
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318 mod tests {
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319 use super::*;
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320
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321 use super::super::index::IndexEntryBuilder;
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322
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323 #[test]
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324 fn version_test() {
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325 let bytes = IndexEntryBuilder::new()
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326 .is_first(true)
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327 .with_version(1)
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328 .build();
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329
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330 assert_eq!(get_version(&bytes), 1)
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331 }
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332 }