Mercurial > hg
annotate rust/hg-core/src/revlog/revlog.rs @ 45536:639f33f22faf
hg-core: add a `ListRevTrackedFiles` operation
List files tracked at a given revision.
Differential Revision: https://phab.mercurial-scm.org/D9014
author | Antoine Cezar <antoine.cezar@octobus.net> |
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date | Fri, 18 Sep 2020 16:52:16 +0200 |
parents | 4f11a67a12fb |
children | 497657895b54 |
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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_bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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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 is_inline = is_inline(&index_mmap); |
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60 |
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61 let index_bytes = Box::new(index_mmap); |
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62 |
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63 // TODO load data only when needed // |
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64 // type annotation required |
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65 // won't recognize Mmap as Deref<Target = [u8]> |
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66 let data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>> = |
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67 if is_inline { |
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68 None |
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69 } else { |
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70 let data_path = index_path.with_extension("d"); |
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71 let data_mmap = |
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72 mmap_open(&data_path).map_err(RevlogError::IoError)?; |
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73 Some(Box::new(data_mmap)) |
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74 }; |
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75 |
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76 Ok(Revlog { |
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77 index_bytes, |
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78 data_bytes, |
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79 }) |
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80 } |
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81 |
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82 /// Return number of entries of the `Revlog`. |
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83 pub fn len(&self) -> usize { |
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84 self.index().len() |
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85 } |
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86 |
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87 /// Returns `true` if the `Revlog` has zero `entries`. |
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88 pub fn is_empty(&self) -> bool { |
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89 self.index().is_empty() |
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90 } |
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91 |
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92 /// Return the full data associated to a node. |
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93 #[timed] |
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94 pub fn get_node_rev(&self, node: &[u8]) -> Result<Revision, RevlogError> { |
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95 let index = self.index(); |
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96 // This is brute force. But it is fast enough for now. |
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97 // Optimization will come later. |
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98 for rev in (0..self.len() as Revision).rev() { |
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99 let index_entry = |
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100 index.get_entry(rev).ok_or(RevlogError::Corrupted)?; |
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101 if node == index_entry.hash() { |
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102 return Ok(rev); |
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103 } |
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104 } |
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105 Err(RevlogError::InvalidRevision) |
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106 } |
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107 |
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108 /// Return the full data associated to a revision. |
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109 /// |
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110 /// All entries required to build the final data out of deltas will be |
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111 /// retrieved as needed, and the deltas will be applied to the inital |
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112 /// snapshot to rebuild the final data. |
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113 #[timed] |
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114 pub fn get_rev_data(&self, rev: Revision) -> Result<Vec<u8>, RevlogError> { |
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115 // Todo return -> Cow |
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116 let mut entry = self.get_entry(rev)?; |
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117 let mut delta_chain = vec![]; |
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118 while let Some(base_rev) = entry.base_rev { |
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119 delta_chain.push(entry); |
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120 entry = self |
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121 .get_entry(base_rev) |
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122 .map_err(|_| RevlogError::Corrupted)?; |
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123 } |
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124 |
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125 // TODO do not look twice in the index |
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126 let index = self.index(); |
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127 let index_entry = |
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128 index.get_entry(rev).ok_or(RevlogError::InvalidRevision)?; |
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129 |
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130 let data: Vec<u8> = if delta_chain.is_empty() { |
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131 entry.data()?.into() |
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132 } else { |
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133 Revlog::build_data_from_deltas(entry, &delta_chain)? |
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134 }; |
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135 |
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136 if self.check_hash( |
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137 index_entry.p1(), |
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138 index_entry.p2(), |
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139 index_entry.hash(), |
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140 &data, |
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141 ) { |
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142 Ok(data) |
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143 } else { |
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144 Err(RevlogError::Corrupted) |
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145 } |
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146 } |
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147 |
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148 /// Check the hash of some given data against the recorded hash. |
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149 pub fn check_hash( |
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150 &self, |
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151 p1: Revision, |
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152 p2: Revision, |
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153 expected: &[u8], |
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154 data: &[u8], |
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155 ) -> bool { |
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156 let index = self.index(); |
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157 let e1 = index.get_entry(p1); |
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158 let h1 = match e1 { |
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159 Some(ref entry) => entry.hash(), |
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160 None => &NULL_NODE_ID, |
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161 }; |
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162 let e2 = index.get_entry(p2); |
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163 let h2 = match e2 { |
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164 Some(ref entry) => entry.hash(), |
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165 None => &NULL_NODE_ID, |
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166 }; |
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167 |
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168 hash(data, &h1, &h2).as_slice() == expected |
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169 } |
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170 |
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171 /// Build the full data of a revision out its snapshot |
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172 /// and its deltas. |
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173 #[timed] |
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174 fn build_data_from_deltas( |
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175 snapshot: RevlogEntry, |
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176 deltas: &[RevlogEntry], |
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177 ) -> Result<Vec<u8>, RevlogError> { |
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178 let snapshot = snapshot.data()?; |
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179 let deltas = deltas |
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180 .iter() |
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181 .rev() |
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182 .map(RevlogEntry::data) |
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183 .collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?; |
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184 let patches: Vec<_> = |
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185 deltas.iter().map(|d| patch::PatchList::new(d)).collect(); |
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186 let patch = patch::fold_patch_lists(&patches); |
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187 Ok(patch.apply(&snapshot)) |
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188 } |
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189 |
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190 /// Return the revlog index. |
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191 pub fn index(&self) -> Index { |
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192 let is_inline = self.data_bytes.is_none(); |
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193 Index::new(&self.index_bytes, is_inline) |
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194 } |
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195 |
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196 /// Return the revlog data. |
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197 fn data(&self) -> &[u8] { |
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198 match self.data_bytes { |
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199 Some(ref data_bytes) => &data_bytes, |
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200 None => &self.index_bytes, |
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201 } |
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202 } |
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203 |
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204 /// Get an entry of the revlog. |
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205 fn get_entry(&self, rev: Revision) -> Result<RevlogEntry, RevlogError> { |
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206 let index = self.index(); |
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207 let index_entry = |
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208 index.get_entry(rev).ok_or(RevlogError::InvalidRevision)?; |
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209 let start = index_entry.offset(); |
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210 let end = start + index_entry.compressed_len(); |
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211 let entry = RevlogEntry { |
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212 rev, |
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213 bytes: &self.data()[start..end], |
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214 compressed_len: index_entry.compressed_len(), |
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215 uncompressed_len: index_entry.uncompressed_len(), |
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216 base_rev: if index_entry.base_revision() == rev { |
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217 None |
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218 } else { |
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219 Some(index_entry.base_revision()) |
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220 }, |
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221 }; |
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222 Ok(entry) |
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223 } |
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224 } |
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225 |
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226 /// The revlog entry's bytes and the necessary informations to extract |
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227 /// the entry's data. |
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228 #[derive(Debug)] |
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229 pub struct RevlogEntry<'a> { |
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230 rev: Revision, |
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231 bytes: &'a [u8], |
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232 compressed_len: usize, |
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233 uncompressed_len: usize, |
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234 base_rev: Option<Revision>, |
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235 } |
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236 |
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237 impl<'a> RevlogEntry<'a> { |
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238 /// Extract the data contained in the entry. |
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239 pub fn data(&self) -> Result<Cow<'_, [u8]>, RevlogError> { |
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240 if self.bytes.is_empty() { |
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241 return Ok(Cow::Borrowed(&[])); |
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242 } |
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243 match self.bytes[0] { |
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244 // Revision data is the entirety of the entry, including this |
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245 // header. |
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246 b'\0' => Ok(Cow::Borrowed(self.bytes)), |
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247 // Raw revision data follows. |
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248 b'u' => Ok(Cow::Borrowed(&self.bytes[1..])), |
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249 // zlib (RFC 1950) data. |
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250 b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data())), |
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251 // zstd data. |
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252 b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data())), |
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253 format_type => Err(RevlogError::UnknowDataFormat(format_type)), |
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254 } |
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255 } |
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256 |
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257 fn uncompressed_zlib_data(&self) -> Vec<u8> { |
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258 let mut decoder = ZlibDecoder::new(self.bytes); |
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259 if self.is_delta() { |
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260 let mut buf = Vec::with_capacity(self.compressed_len); |
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261 decoder.read_to_end(&mut buf).expect("corrupted zlib data"); |
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262 buf |
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263 } else { |
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264 let mut buf = vec![0; self.uncompressed_len]; |
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265 decoder.read_exact(&mut buf).expect("corrupted zlib data"); |
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266 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) -> Vec<u8> { |
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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 .expect("corrupted zstd data"); |
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275 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 .expect("corrupted zstd data"); |
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280 assert_eq!(len, self.uncompressed_len, "corrupted zstd data"); |
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281 buf |
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282 } |
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283 } |
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284 |
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285 /// Tell if the entry is a snapshot or a delta |
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286 /// (influences on decompression). |
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287 fn is_delta(&self) -> bool { |
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288 self.base_rev.is_some() |
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289 } |
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290 } |
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291 |
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292 /// Value of the inline flag. |
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293 pub fn is_inline(index_bytes: &[u8]) -> bool { |
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294 match &index_bytes[0..=1] { |
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295 [0, 0] | [0, 2] => false, |
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296 _ => true, |
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297 } |
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298 } |
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299 |
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300 /// Format version of the revlog. |
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301 pub fn get_version(index_bytes: &[u8]) -> u16 { |
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302 BigEndian::read_u16(&index_bytes[2..=3]) |
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303 } |
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304 |
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305 /// Calculate the hash of a revision given its data and its parents. |
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306 fn hash(data: &[u8], p1_hash: &[u8], p2_hash: &[u8]) -> Vec<u8> { |
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307 let mut hasher = Sha1::new(); |
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308 let (a, b) = (p1_hash, p2_hash); |
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309 if a > b { |
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310 hasher.input(b); |
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311 hasher.input(a); |
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312 } else { |
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313 hasher.input(a); |
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314 hasher.input(b); |
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315 } |
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316 hasher.input(data); |
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317 let mut hash = vec![0; NODE_BYTES_LENGTH]; |
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318 hasher.result(&mut hash); |
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319 hash |
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320 } |
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321 |
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322 #[cfg(test)] |
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323 mod tests { |
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324 use super::*; |
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325 |
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326 use super::super::index::IndexEntryBuilder; |
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327 |
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328 #[cfg(test)] |
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329 pub struct RevlogBuilder { |
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330 version: u16, |
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331 is_general_delta: bool, |
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332 is_inline: bool, |
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333 offset: usize, |
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334 index: Vec<Vec<u8>>, |
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335 data: Vec<Vec<u8>>, |
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336 } |
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337 |
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338 #[cfg(test)] |
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339 impl RevlogBuilder { |
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340 pub fn new() -> Self { |
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341 Self { |
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342 version: 2, |
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343 is_inline: false, |
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344 is_general_delta: true, |
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345 offset: 0, |
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346 index: vec![], |
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347 data: vec![], |
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348 } |
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349 } |
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350 |
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351 pub fn with_inline(&mut self, value: bool) -> &mut Self { |
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352 self.is_inline = value; |
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353 self |
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354 } |
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355 |
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356 pub fn with_general_delta(&mut self, value: bool) -> &mut Self { |
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357 self.is_general_delta = value; |
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358 self |
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359 } |
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360 |
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361 pub fn with_version(&mut self, value: u16) -> &mut Self { |
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362 self.version = value; |
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363 self |
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364 } |
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365 |
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366 pub fn push( |
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367 &mut self, |
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368 mut index: IndexEntryBuilder, |
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369 data: Vec<u8>, |
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370 ) -> &mut Self { |
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371 if self.index.is_empty() { |
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372 index.is_first(true); |
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373 index.with_general_delta(self.is_general_delta); |
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374 index.with_inline(self.is_inline); |
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375 index.with_version(self.version); |
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376 } else { |
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377 index.with_offset(self.offset); |
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378 } |
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379 self.index.push(index.build()); |
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380 self.offset += data.len(); |
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381 self.data.push(data); |
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382 self |
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383 } |
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384 |
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385 pub fn build_inline(&self) -> Vec<u8> { |
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386 let mut bytes = |
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387 Vec::with_capacity(self.index.len() + self.data.len()); |
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388 for (index, data) in self.index.iter().zip(self.data.iter()) { |
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389 bytes.extend(index); |
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390 bytes.extend(data); |
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391 } |
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392 bytes |
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393 } |
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394 } |
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395 |
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396 #[test] |
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397 fn is_not_inline_when_no_inline_flag_test() { |
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398 let bytes = RevlogBuilder::new() |
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399 .with_general_delta(false) |
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400 .with_inline(false) |
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401 .push(IndexEntryBuilder::new(), vec![]) |
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402 .build_inline(); |
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403 |
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404 assert_eq!(is_inline(&bytes), false) |
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405 } |
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406 |
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407 #[test] |
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408 fn is_inline_when_inline_flag_test() { |
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409 let bytes = RevlogBuilder::new() |
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410 .with_general_delta(false) |
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411 .with_inline(true) |
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412 .push(IndexEntryBuilder::new(), vec![]) |
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413 .build_inline(); |
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414 |
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415 assert_eq!(is_inline(&bytes), true) |
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416 } |
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417 |
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418 #[test] |
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419 fn is_inline_when_inline_and_generaldelta_flags_test() { |
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420 let bytes = RevlogBuilder::new() |
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421 .with_general_delta(true) |
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422 .with_inline(true) |
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423 .push(IndexEntryBuilder::new(), vec![]) |
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424 .build_inline(); |
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425 |
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426 assert_eq!(is_inline(&bytes), true) |
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427 } |
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428 |
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429 #[test] |
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430 fn version_test() { |
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431 let bytes = RevlogBuilder::new() |
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432 .with_version(1) |
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433 .push(IndexEntryBuilder::new(), vec![]) |
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434 .build_inline(); |
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435 |
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436 assert_eq!(get_version(&bytes), 1) |
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437 } |
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438 } |