Mercurial > hg
annotate rust/hg-core/src/revlog/revlog.rs @ 46390:0800aa42bb4c
rust: use the bytes-cast crate to parse persistent nodemaps
This crate casts pointers to custom structs, with compile-time safety checks,
for easy and efficient binary data parsing.
See https://crates.io/crates/bytes-cast and
https://docs.rs/bytes-cast/0.1.0/bytes_cast/
Differential Revision: https://phab.mercurial-scm.org/D9788
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 15 Jan 2021 16:11:54 +0100 |
parents | 8a4914397d02 |
children | 645ee7225fab |
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1 use std::borrow::Cow; |
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2 use std::io::Read; |
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3 use std::ops::Deref; |
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4 use std::path::Path; |
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5 |
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6 use byteorder::{BigEndian, ByteOrder}; |
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7 use crypto::digest::Digest; |
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8 use crypto::sha1::Sha1; |
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9 use flate2::read::ZlibDecoder; |
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10 use micro_timer::timed; |
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11 use zstd; |
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12 |
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13 use super::index::Index; |
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14 use super::node::{NodePrefixRef, NODE_BYTES_LENGTH, NULL_NODE}; |
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15 use super::nodemap; |
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16 use super::nodemap::NodeMap; |
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17 use super::nodemap_docket::NodeMapDocket; |
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18 use super::patch; |
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19 use crate::repo::Repo; |
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20 use crate::revlog::Revision; |
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21 |
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22 pub enum RevlogError { |
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23 IoError(std::io::Error), |
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24 UnsuportedVersion(u16), |
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25 InvalidRevision, |
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26 /// Found more than one entry whose ID match the requested prefix |
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27 AmbiguousPrefix, |
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28 Corrupted, |
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29 UnknowDataFormat(u8), |
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30 } |
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31 |
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32 impl From<bytes_cast::FromBytesError> for RevlogError { |
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33 fn from(_: bytes_cast::FromBytesError) -> Self { |
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34 RevlogError::Corrupted |
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35 } |
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36 } |
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37 |
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38 /// Read only implementation of revlog. |
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39 pub struct Revlog { |
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40 /// When index and data are not interleaved: bytes of the revlog index. |
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41 /// When index and data are interleaved: bytes of the revlog index and |
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42 /// data. |
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43 index: Index, |
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44 /// When index and data are not interleaved: bytes of the revlog data |
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45 data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>>, |
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46 /// When present on disk: the persistent nodemap for this revlog |
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47 nodemap: Option<nodemap::NodeTree>, |
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48 } |
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49 |
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50 impl Revlog { |
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51 /// Open a revlog index file. |
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52 /// |
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53 /// It will also open the associated data file if index and data are not |
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54 /// interleaved. |
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55 #[timed] |
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56 pub fn open( |
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57 repo: &Repo, |
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58 index_path: impl AsRef<Path>, |
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59 data_path: Option<&Path>, |
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60 ) -> Result<Self, RevlogError> { |
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61 let index_path = index_path.as_ref(); |
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62 let index_mmap = repo |
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63 .store_vfs() |
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64 .mmap_open(&index_path) |
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65 .map_err(RevlogError::IoError)?; |
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66 |
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67 let version = get_version(&index_mmap); |
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68 if version != 1 { |
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69 return Err(RevlogError::UnsuportedVersion(version)); |
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70 } |
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71 |
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72 let index = Index::new(Box::new(index_mmap))?; |
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73 |
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74 let default_data_path = index_path.with_extension("d"); |
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75 |
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76 // type annotation required |
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77 // won't recognize Mmap as Deref<Target = [u8]> |
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78 let data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>> = |
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79 if index.is_inline() { |
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80 None |
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81 } else { |
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82 let data_path = data_path.unwrap_or(&default_data_path); |
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83 let data_mmap = repo |
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84 .store_vfs() |
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85 .mmap_open(data_path) |
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86 .map_err(RevlogError::IoError)?; |
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87 Some(Box::new(data_mmap)) |
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88 }; |
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89 |
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90 let nodemap = NodeMapDocket::read_from_file(repo, index_path)?.map( |
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91 |(docket, data)| { |
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92 nodemap::NodeTree::load_bytes( |
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93 Box::new(data), |
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94 docket.data_length, |
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95 ) |
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96 }, |
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97 ); |
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98 |
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99 Ok(Revlog { |
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100 index, |
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101 data_bytes, |
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102 nodemap, |
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103 }) |
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104 } |
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105 |
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106 /// Return number of entries of the `Revlog`. |
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107 pub fn len(&self) -> usize { |
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108 self.index.len() |
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109 } |
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110 |
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111 /// Returns `true` if the `Revlog` has zero `entries`. |
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112 pub fn is_empty(&self) -> bool { |
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113 self.index.is_empty() |
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114 } |
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115 |
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116 /// Return the full data associated to a node. |
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117 #[timed] |
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118 pub fn get_node_rev( |
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119 &self, |
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120 node: NodePrefixRef, |
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121 ) -> Result<Revision, RevlogError> { |
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122 if let Some(nodemap) = &self.nodemap { |
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123 return nodemap |
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124 .find_bin(&self.index, node) |
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125 // TODO: propagate details of this error: |
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126 .map_err(|_| RevlogError::Corrupted)? |
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127 .ok_or(RevlogError::InvalidRevision); |
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128 } |
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129 |
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130 // Fallback to linear scan when a persistent nodemap is not present. |
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131 // This happens when the persistent-nodemap experimental feature is not |
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132 // enabled, or for small revlogs. |
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133 // |
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134 // TODO: consider building a non-persistent nodemap in memory to |
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135 // optimize these cases. |
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136 let mut found_by_prefix = None; |
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137 for rev in (0..self.len() as Revision).rev() { |
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138 let index_entry = |
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139 self.index.get_entry(rev).ok_or(RevlogError::Corrupted)?; |
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140 if node == *index_entry.hash() { |
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141 return Ok(rev); |
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142 } |
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143 if node.is_prefix_of(index_entry.hash()) { |
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144 if found_by_prefix.is_some() { |
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145 return Err(RevlogError::AmbiguousPrefix); |
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146 } |
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147 found_by_prefix = Some(rev) |
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148 } |
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149 } |
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150 found_by_prefix.ok_or(RevlogError::InvalidRevision) |
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151 } |
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152 |
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153 /// Return the full data associated to a revision. |
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154 /// |
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155 /// All entries required to build the final data out of deltas will be |
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156 /// retrieved as needed, and the deltas will be applied to the inital |
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157 /// snapshot to rebuild the final data. |
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158 #[timed] |
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159 pub fn get_rev_data(&self, rev: Revision) -> Result<Vec<u8>, RevlogError> { |
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160 // Todo return -> Cow |
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161 let mut entry = self.get_entry(rev)?; |
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162 let mut delta_chain = vec![]; |
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163 while let Some(base_rev) = entry.base_rev { |
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164 delta_chain.push(entry); |
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165 entry = |
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166 self.get_entry(base_rev).or(Err(RevlogError::Corrupted))?; |
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167 } |
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168 |
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169 // TODO do not look twice in the index |
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170 let index_entry = self |
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171 .index |
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172 .get_entry(rev) |
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173 .ok_or(RevlogError::InvalidRevision)?; |
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174 |
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175 let data: Vec<u8> = if delta_chain.is_empty() { |
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176 entry.data()?.into() |
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177 } else { |
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178 Revlog::build_data_from_deltas(entry, &delta_chain)? |
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179 }; |
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180 |
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181 if self.check_hash( |
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182 index_entry.p1(), |
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183 index_entry.p2(), |
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184 index_entry.hash().as_bytes(), |
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185 &data, |
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186 ) { |
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187 Ok(data) |
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188 } else { |
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189 Err(RevlogError::Corrupted) |
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190 } |
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191 } |
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192 |
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193 /// Check the hash of some given data against the recorded hash. |
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194 pub fn check_hash( |
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195 &self, |
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196 p1: Revision, |
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197 p2: Revision, |
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198 expected: &[u8], |
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199 data: &[u8], |
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200 ) -> bool { |
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201 let e1 = self.index.get_entry(p1); |
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202 let h1 = match e1 { |
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203 Some(ref entry) => entry.hash(), |
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204 None => &NULL_NODE, |
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205 }; |
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206 let e2 = self.index.get_entry(p2); |
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207 let h2 = match e2 { |
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208 Some(ref entry) => entry.hash(), |
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209 None => &NULL_NODE, |
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210 }; |
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211 |
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212 hash(data, h1.as_bytes(), h2.as_bytes()).as_slice() == expected |
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213 } |
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214 |
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215 /// Build the full data of a revision out its snapshot |
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216 /// and its deltas. |
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217 #[timed] |
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218 fn build_data_from_deltas( |
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219 snapshot: RevlogEntry, |
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220 deltas: &[RevlogEntry], |
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221 ) -> Result<Vec<u8>, RevlogError> { |
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222 let snapshot = snapshot.data()?; |
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223 let deltas = deltas |
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224 .iter() |
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225 .rev() |
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226 .map(RevlogEntry::data) |
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227 .collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?; |
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228 let patches: Vec<_> = |
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229 deltas.iter().map(|d| patch::PatchList::new(d)).collect(); |
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230 let patch = patch::fold_patch_lists(&patches); |
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231 Ok(patch.apply(&snapshot)) |
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232 } |
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233 |
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234 /// Return the revlog data. |
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235 fn data(&self) -> &[u8] { |
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236 match self.data_bytes { |
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237 Some(ref data_bytes) => &data_bytes, |
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238 None => panic!( |
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239 "forgot to load the data or trying to access inline data" |
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240 ), |
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241 } |
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242 } |
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243 |
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244 /// Get an entry of the revlog. |
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245 fn get_entry(&self, rev: Revision) -> Result<RevlogEntry, RevlogError> { |
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246 let index_entry = self |
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247 .index |
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248 .get_entry(rev) |
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249 .ok_or(RevlogError::InvalidRevision)?; |
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250 let start = index_entry.offset(); |
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251 let end = start + index_entry.compressed_len(); |
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252 let data = if self.index.is_inline() { |
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253 self.index.data(start, end) |
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254 } else { |
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255 &self.data()[start..end] |
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256 }; |
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257 let entry = RevlogEntry { |
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258 rev, |
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259 bytes: data, |
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260 compressed_len: index_entry.compressed_len(), |
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261 uncompressed_len: index_entry.uncompressed_len(), |
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262 base_rev: if index_entry.base_revision() == rev { |
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263 None |
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264 } else { |
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265 Some(index_entry.base_revision()) |
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266 }, |
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267 }; |
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268 Ok(entry) |
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269 } |
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270 } |
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271 |
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272 /// The revlog entry's bytes and the necessary informations to extract |
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273 /// the entry's data. |
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274 #[derive(Debug)] |
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275 pub struct RevlogEntry<'a> { |
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276 rev: Revision, |
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277 bytes: &'a [u8], |
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278 compressed_len: usize, |
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279 uncompressed_len: usize, |
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280 base_rev: Option<Revision>, |
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281 } |
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282 |
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283 impl<'a> RevlogEntry<'a> { |
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284 /// Extract the data contained in the entry. |
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285 pub fn data(&self) -> Result<Cow<'_, [u8]>, RevlogError> { |
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286 if self.bytes.is_empty() { |
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287 return Ok(Cow::Borrowed(&[])); |
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288 } |
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289 match self.bytes[0] { |
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290 // Revision data is the entirety of the entry, including this |
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291 // header. |
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292 b'\0' => Ok(Cow::Borrowed(self.bytes)), |
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293 // Raw revision data follows. |
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294 b'u' => Ok(Cow::Borrowed(&self.bytes[1..])), |
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295 // zlib (RFC 1950) data. |
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296 b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data()?)), |
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297 // zstd data. |
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298 b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data()?)), |
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299 format_type => Err(RevlogError::UnknowDataFormat(format_type)), |
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300 } |
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301 } |
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302 |
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303 fn uncompressed_zlib_data(&self) -> Result<Vec<u8>, RevlogError> { |
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304 let mut decoder = ZlibDecoder::new(self.bytes); |
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305 if self.is_delta() { |
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306 let mut buf = Vec::with_capacity(self.compressed_len); |
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307 decoder |
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308 .read_to_end(&mut buf) |
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309 .or(Err(RevlogError::Corrupted))?; |
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310 Ok(buf) |
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311 } else { |
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312 let mut buf = vec![0; self.uncompressed_len]; |
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313 decoder |
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314 .read_exact(&mut buf) |
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315 .or(Err(RevlogError::Corrupted))?; |
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316 Ok(buf) |
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317 } |
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318 } |
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319 |
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320 fn uncompressed_zstd_data(&self) -> Result<Vec<u8>, RevlogError> { |
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321 if self.is_delta() { |
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322 let mut buf = Vec::with_capacity(self.compressed_len); |
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323 zstd::stream::copy_decode(self.bytes, &mut buf) |
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324 .or(Err(RevlogError::Corrupted))?; |
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325 Ok(buf) |
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326 } else { |
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327 let mut buf = vec![0; self.uncompressed_len]; |
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328 let len = zstd::block::decompress_to_buffer(self.bytes, &mut buf) |
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329 .or(Err(RevlogError::Corrupted))?; |
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330 if len != self.uncompressed_len { |
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331 Err(RevlogError::Corrupted) |
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332 } else { |
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333 Ok(buf) |
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334 } |
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335 } |
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336 } |
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337 |
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338 /// Tell if the entry is a snapshot or a delta |
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339 /// (influences on decompression). |
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340 fn is_delta(&self) -> bool { |
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341 self.base_rev.is_some() |
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342 } |
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343 } |
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344 |
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345 /// Format version of the revlog. |
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346 pub fn get_version(index_bytes: &[u8]) -> u16 { |
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347 BigEndian::read_u16(&index_bytes[2..=3]) |
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348 } |
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349 |
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350 /// Calculate the hash of a revision given its data and its parents. |
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351 fn hash(data: &[u8], p1_hash: &[u8], p2_hash: &[u8]) -> Vec<u8> { |
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352 let mut hasher = Sha1::new(); |
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353 let (a, b) = (p1_hash, p2_hash); |
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354 if a > b { |
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355 hasher.input(b); |
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356 hasher.input(a); |
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357 } else { |
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358 hasher.input(a); |
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359 hasher.input(b); |
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360 } |
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361 hasher.input(data); |
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362 let mut hash = vec![0; NODE_BYTES_LENGTH]; |
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363 hasher.result(&mut hash); |
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364 hash |
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365 } |
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366 |
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367 #[cfg(test)] |
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368 mod tests { |
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369 use super::*; |
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370 |
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371 use super::super::index::IndexEntryBuilder; |
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372 |
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373 #[test] |
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374 fn version_test() { |
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375 let bytes = IndexEntryBuilder::new() |
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376 .is_first(true) |
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377 .with_version(1) |
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378 .build(); |
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379 |
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380 assert_eq!(get_version(&bytes), 1) |
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381 } |
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382 } |