Mercurial > hg
annotate rust/hg-core/src/revlog/revlog.rs @ 45603:be951ca95b08
hg-core: use `.or(Err(Error))` not `.map_err(|_| Error)` (D9100#inline-15067)
Differential Revision: https://phab.mercurial-scm.org/D9108
author | Antoine cezar<acezar@chwitlabs.fr> |
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date | Mon, 28 Sep 2020 16:52:35 +0200 |
parents | 1cef583541c0 |
children | 7252f5237352 |
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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 = |
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115 self.get_entry(base_rev).or(Err(RevlogError::Corrupted))?; |
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116 } |
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117 |
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118 // TODO do not look twice in the index |
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119 let index_entry = self |
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120 .index |
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121 .get_entry(rev) |
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122 .ok_or(RevlogError::InvalidRevision)?; |
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123 |
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124 let data: Vec<u8> = if delta_chain.is_empty() { |
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125 entry.data()?.into() |
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126 } else { |
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127 Revlog::build_data_from_deltas(entry, &delta_chain)? |
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128 }; |
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129 |
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130 if self.check_hash( |
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131 index_entry.p1(), |
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132 index_entry.p2(), |
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133 index_entry.hash(), |
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134 &data, |
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135 ) { |
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136 Ok(data) |
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137 } else { |
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138 Err(RevlogError::Corrupted) |
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139 } |
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140 } |
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141 |
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142 /// Check the hash of some given data against the recorded hash. |
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143 pub fn check_hash( |
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144 &self, |
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145 p1: Revision, |
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146 p2: Revision, |
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147 expected: &[u8], |
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148 data: &[u8], |
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149 ) -> bool { |
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150 let e1 = self.index.get_entry(p1); |
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151 let h1 = match e1 { |
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152 Some(ref entry) => entry.hash(), |
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153 None => &NULL_NODE_ID, |
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154 }; |
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155 let e2 = self.index.get_entry(p2); |
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156 let h2 = match e2 { |
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157 Some(ref entry) => entry.hash(), |
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158 None => &NULL_NODE_ID, |
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159 }; |
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160 |
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161 hash(data, &h1, &h2).as_slice() == expected |
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162 } |
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163 |
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164 /// Build the full data of a revision out its snapshot |
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165 /// and its deltas. |
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166 #[timed] |
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167 fn build_data_from_deltas( |
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168 snapshot: RevlogEntry, |
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169 deltas: &[RevlogEntry], |
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170 ) -> Result<Vec<u8>, RevlogError> { |
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171 let snapshot = snapshot.data()?; |
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172 let deltas = deltas |
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173 .iter() |
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174 .rev() |
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175 .map(RevlogEntry::data) |
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176 .collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?; |
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177 let patches: Vec<_> = |
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178 deltas.iter().map(|d| patch::PatchList::new(d)).collect(); |
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179 let patch = patch::fold_patch_lists(&patches); |
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180 Ok(patch.apply(&snapshot)) |
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181 } |
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182 |
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183 /// Return the revlog data. |
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184 fn data(&self) -> &[u8] { |
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185 match self.data_bytes { |
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186 Some(ref data_bytes) => &data_bytes, |
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187 None => panic!( |
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188 "forgot to load the data or trying to access inline data" |
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189 ), |
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190 } |
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191 } |
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192 |
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193 /// Get an entry of the revlog. |
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194 fn get_entry(&self, rev: Revision) -> Result<RevlogEntry, RevlogError> { |
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195 let index_entry = self |
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196 .index |
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197 .get_entry(rev) |
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198 .ok_or(RevlogError::InvalidRevision)?; |
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199 let start = index_entry.offset(); |
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200 let end = start + index_entry.compressed_len(); |
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201 let data = if self.index.is_inline() { |
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202 self.index.data(start, end) |
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203 } else { |
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204 &self.data()[start..end] |
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205 }; |
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206 let entry = RevlogEntry { |
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207 rev, |
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208 bytes: data, |
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209 compressed_len: index_entry.compressed_len(), |
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210 uncompressed_len: index_entry.uncompressed_len(), |
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211 base_rev: if index_entry.base_revision() == rev { |
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212 None |
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213 } else { |
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214 Some(index_entry.base_revision()) |
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215 }, |
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216 }; |
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217 Ok(entry) |
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218 } |
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219 } |
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220 |
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221 /// The revlog entry's bytes and the necessary informations to extract |
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222 /// the entry's data. |
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223 #[derive(Debug)] |
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224 pub struct RevlogEntry<'a> { |
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225 rev: Revision, |
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226 bytes: &'a [u8], |
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227 compressed_len: usize, |
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228 uncompressed_len: usize, |
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229 base_rev: Option<Revision>, |
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230 } |
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231 |
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232 impl<'a> RevlogEntry<'a> { |
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233 /// Extract the data contained in the entry. |
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234 pub fn data(&self) -> Result<Cow<'_, [u8]>, RevlogError> { |
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235 if self.bytes.is_empty() { |
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236 return Ok(Cow::Borrowed(&[])); |
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237 } |
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238 match self.bytes[0] { |
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239 // Revision data is the entirety of the entry, including this |
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240 // header. |
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241 b'\0' => Ok(Cow::Borrowed(self.bytes)), |
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242 // Raw revision data follows. |
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243 b'u' => Ok(Cow::Borrowed(&self.bytes[1..])), |
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244 // zlib (RFC 1950) data. |
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245 b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data()?)), |
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246 // zstd data. |
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247 b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data()?)), |
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248 format_type => Err(RevlogError::UnknowDataFormat(format_type)), |
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249 } |
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250 } |
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251 |
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252 fn uncompressed_zlib_data(&self) -> Result<Vec<u8>, RevlogError> { |
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253 let mut decoder = ZlibDecoder::new(self.bytes); |
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254 if self.is_delta() { |
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255 let mut buf = Vec::with_capacity(self.compressed_len); |
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256 decoder |
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257 .read_to_end(&mut buf) |
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258 .or(Err(RevlogError::Corrupted))?; |
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259 Ok(buf) |
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260 } else { |
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261 let mut buf = vec![0; self.uncompressed_len]; |
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262 decoder |
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263 .read_exact(&mut buf) |
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264 .or(Err(RevlogError::Corrupted))?; |
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265 Ok(buf) |
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266 } |
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267 } |
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268 |
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269 fn uncompressed_zstd_data(&self) -> Result<Vec<u8>, RevlogError> { |
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270 if self.is_delta() { |
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271 let mut buf = Vec::with_capacity(self.compressed_len); |
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272 zstd::stream::copy_decode(self.bytes, &mut buf) |
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273 .or(Err(RevlogError::Corrupted))?; |
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274 Ok(buf) |
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275 } else { |
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276 let mut buf = vec![0; self.uncompressed_len]; |
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277 let len = zstd::block::decompress_to_buffer(self.bytes, &mut buf) |
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278 .or(Err(RevlogError::Corrupted))?; |
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279 if len != self.uncompressed_len { |
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280 Err(RevlogError::Corrupted) |
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281 } else { |
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282 Ok(buf) |
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283 } |
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284 } |
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285 } |
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286 |
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287 /// Tell if the entry is a snapshot or a delta |
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288 /// (influences on decompression). |
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289 fn is_delta(&self) -> bool { |
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290 self.base_rev.is_some() |
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291 } |
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292 } |
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293 |
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294 /// Format version of the revlog. |
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295 pub fn get_version(index_bytes: &[u8]) -> u16 { |
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296 BigEndian::read_u16(&index_bytes[2..=3]) |
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297 } |
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298 |
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299 /// Calculate the hash of a revision given its data and its parents. |
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300 fn hash(data: &[u8], p1_hash: &[u8], p2_hash: &[u8]) -> Vec<u8> { |
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301 let mut hasher = Sha1::new(); |
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302 let (a, b) = (p1_hash, p2_hash); |
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303 if a > b { |
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304 hasher.input(b); |
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305 hasher.input(a); |
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306 } else { |
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307 hasher.input(a); |
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308 hasher.input(b); |
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309 } |
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310 hasher.input(data); |
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311 let mut hash = vec![0; NODE_BYTES_LENGTH]; |
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312 hasher.result(&mut hash); |
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313 hash |
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314 } |
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315 |
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316 #[cfg(test)] |
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317 mod tests { |
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318 use super::*; |
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319 |
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320 use super::super::index::IndexEntryBuilder; |
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321 |
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322 #[test] |
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323 fn version_test() { |
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324 let bytes = IndexEntryBuilder::new() |
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325 .is_first(true) |
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Antoine Cezar <antoine.cezar@octobus.net>
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326 .with_version(1) |
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327 .build(); |
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328 |
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Antoine Cezar <antoine.cezar@octobus.net>
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329 assert_eq!(get_version(&bytes), 1) |
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Antoine Cezar <antoine.cezar@octobus.net>
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330 } |
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331 } |