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annotate rust/hg-core/src/revlog/revlog.rs @ 45532:26c53ee51c68

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hg-core: Add a limited read only `revlog` implementation Only covers the needs of the upcoming `rhg debugdata` command. Differential Revision: https://phab.mercurial-scm.org/D8958
author Antoine Cezar <antoine.cezar@octobus.net>
date Fri, 04 Sep 2020 11:55:07 +0200
parents
children b0d6309ff50c
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45532
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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 flate2::read::ZlibDecoder;
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9 use memmap::{Mmap, MmapOptions};
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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::patch;
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15 use crate::revlog::Revision;
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16
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17 pub enum RevlogError {
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18 IoError(std::io::Error),
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19 UnsuportedVersion(u16),
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20 InvalidRevision,
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21 Corrupted,
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22 UnknowDataFormat(u8),
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23 }
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24
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25 fn mmap_open(path: &Path) -> Result<Mmap, std::io::Error> {
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26 let file = File::open(path)?;
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27 let mmap = unsafe { MmapOptions::new().map(&file) }?;
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28 Ok(mmap)
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29 }
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30
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31 /// Read only implementation of revlog.
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32 pub struct Revlog {
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33 /// When index and data are not interleaved: bytes of the revlog index.
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34 /// When index and data are interleaved: bytes of the revlog index and
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35 /// data.
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36 index_bytes: Box<dyn Deref<Target = [u8]> + Send>,
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37 /// When index and data are not interleaved: bytes of the revlog data
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38 data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>>,
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39 }
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40
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41 impl Revlog {
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42 /// Open a revlog index file.
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43 ///
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44 /// It will also open the associated data file if index and data are not
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45 /// interleaved.
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46 #[timed]
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47 pub fn open(index_path: &Path) -> Result<Self, RevlogError> {
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48 let index_mmap =
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49 mmap_open(&index_path).map_err(RevlogError::IoError)?;
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50
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51 let version = get_version(&index_mmap);
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52 if version != 1 {
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53 return Err(RevlogError::UnsuportedVersion(version));
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54 }
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55
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56 let is_inline = is_inline(&index_mmap);
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57
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58 let index_bytes = Box::new(index_mmap);
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59
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60 // TODO load data only when needed //
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61 // type annotation required
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62 // won't recognize Mmap as Deref<Target = [u8]>
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63 let data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>> =
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64 if is_inline {
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65 None
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66 } else {
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67 let data_path = index_path.with_extension("d");
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68 let data_mmap =
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69 mmap_open(&data_path).map_err(RevlogError::IoError)?;
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70 Some(Box::new(data_mmap))
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71 };
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72
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73 Ok(Revlog {
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74 index_bytes,
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75 data_bytes,
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76 })
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77 }
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78
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79 /// Return the full data associated to a revision.
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80 ///
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81 /// All entries required to build the final data out of deltas will be
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82 /// retrieved as needed, and the deltas will be applied to the inital
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83 /// snapshot to rebuild the final data.
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84 #[timed]
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85 pub fn get_rev_data(&self, rev: Revision) -> Result<Vec<u8>, RevlogError> {
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86 // Todo return -> Cow
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87 let mut entry = self.get_entry(rev)?;
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88 let mut delta_chain = vec![];
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89 while let Some(base_rev) = entry.base_rev {
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90 delta_chain.push(entry);
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91 entry = self
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92 .get_entry(base_rev)
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93 .map_err(|_| RevlogError::Corrupted)?;
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94 }
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95
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96 if delta_chain.is_empty() {
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97 Ok(entry.data()?.into())
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98 } else {
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99 Revlog::build_data_from_deltas(entry, &delta_chain)
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100 }
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101 }
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102
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103 /// Build the full data of a revision out its snapshot
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104 /// and its deltas.
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105 #[timed]
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106 fn build_data_from_deltas(
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107 snapshot: RevlogEntry,
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108 deltas: &[RevlogEntry],
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109 ) -> Result<Vec<u8>, RevlogError> {
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110 let snapshot = snapshot.data()?;
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111 let deltas = deltas
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112 .iter()
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113 .rev()
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114 .map(RevlogEntry::data)
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115 .collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?;
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116 let patches: Vec<_> =
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117 deltas.iter().map(|d| patch::PatchList::new(d)).collect();
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118 let patch = patch::fold_patch_lists(&patches);
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119 Ok(patch.apply(&snapshot))
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120 }
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121
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122 /// Return the revlog index.
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123 fn index(&self) -> Index {
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124 let is_inline = self.data_bytes.is_none();
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125 Index::new(&self.index_bytes, is_inline)
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126 }
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127
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128 /// Return the revlog data.
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129 fn data(&self) -> &[u8] {
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130 match self.data_bytes {
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131 Some(ref data_bytes) => &data_bytes,
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132 None => &self.index_bytes,
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133 }
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134 }
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135
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136 /// Get an entry of the revlog.
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137 fn get_entry(&self, rev: Revision) -> Result<RevlogEntry, RevlogError> {
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138 let index = self.index();
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139 let index_entry =
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140 index.get_entry(rev).ok_or(RevlogError::InvalidRevision)?;
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141 let start = index_entry.offset();
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142 let end = start + index_entry.compressed_len();
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143 let entry = RevlogEntry {
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144 rev,
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145 bytes: &self.data()[start..end],
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146 compressed_len: index_entry.compressed_len(),
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147 uncompressed_len: index_entry.uncompressed_len(),
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148 base_rev: if index_entry.base_revision() == rev {
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149 None
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150 } else {
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151 Some(index_entry.base_revision())
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152 },
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153 };
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154 Ok(entry)
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155 }
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156 }
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157
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158 /// The revlog entry's bytes and the necessary informations to extract
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159 /// the entry's data.
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160 #[derive(Debug)]
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161 pub struct RevlogEntry<'a> {
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162 rev: Revision,
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163 bytes: &'a [u8],
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164 compressed_len: usize,
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165 uncompressed_len: usize,
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166 base_rev: Option<Revision>,
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167 }
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168
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169 impl<'a> RevlogEntry<'a> {
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170 /// Extract the data contained in the entry.
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171 pub fn data(&self) -> Result<Cow<'_, [u8]>, RevlogError> {
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172 if self.bytes.is_empty() {
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173 return Ok(Cow::Borrowed(&[]));
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174 }
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175 match self.bytes[0] {
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176 // Revision data is the entirety of the entry, including this
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177 // header.
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178 b'\0' => Ok(Cow::Borrowed(self.bytes)),
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179 // Raw revision data follows.
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180 b'u' => Ok(Cow::Borrowed(&self.bytes[1..])),
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181 // zlib (RFC 1950) data.
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182 b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data())),
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183 // zstd data.
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184 b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data())),
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185 format_type => Err(RevlogError::UnknowDataFormat(format_type)),
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186 }
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187 }
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188
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189 fn uncompressed_zlib_data(&self) -> Vec<u8> {
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190 let mut decoder = ZlibDecoder::new(self.bytes);
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191 if self.is_delta() {
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192 let mut buf = Vec::with_capacity(self.compressed_len);
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193 decoder.read_to_end(&mut buf).expect("corrupted zlib data");
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194 buf
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195 } else {
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196 let mut buf = vec![0; self.uncompressed_len];
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197 decoder.read_exact(&mut buf).expect("corrupted zlib data");
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198 buf
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199 }
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200 }
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201
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202 fn uncompressed_zstd_data(&self) -> Vec<u8> {
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203 if self.is_delta() {
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204 let mut buf = Vec::with_capacity(self.compressed_len);
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205 zstd::stream::copy_decode(self.bytes, &mut buf)
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206 .expect("corrupted zstd data");
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207 buf
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208 } else {
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209 let mut buf = vec![0; self.uncompressed_len];
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210 let len = zstd::block::decompress_to_buffer(self.bytes, &mut buf)
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211 .expect("corrupted zstd data");
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212 assert_eq!(len, self.uncompressed_len, "corrupted zstd data");
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213 buf
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214 }
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215 }
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216
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217 /// Tell if the entry is a snapshot or a delta
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218 /// (influences on decompression).
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219 fn is_delta(&self) -> bool {
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220 self.base_rev.is_some()
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221 }
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222 }
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223
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224 /// Value of the inline flag.
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225 pub fn is_inline(index_bytes: &[u8]) -> bool {
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226 match &index_bytes[0..=1] {
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227 [0, 0] | [0, 2] => false,
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228 _ => true,
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229 }
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230 }
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231
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232 /// Format version of the revlog.
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233 pub fn get_version(index_bytes: &[u8]) -> u16 {
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234 BigEndian::read_u16(&index_bytes[2..=3])
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235 }
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236
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237 #[cfg(test)]
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238 mod tests {
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239 use super::*;
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240
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241 use super::super::index::IndexEntryBuilder;
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242
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243 #[cfg(test)]
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244 pub struct RevlogBuilder {
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245 version: u16,
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246 is_general_delta: bool,
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247 is_inline: bool,
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248 offset: usize,
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249 index: Vec<Vec<u8>>,
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250 data: Vec<Vec<u8>>,
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251 }
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252
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253 #[cfg(test)]
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254 impl RevlogBuilder {
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255 pub fn new() -> Self {
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256 Self {
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257 version: 2,
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258 is_inline: false,
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259 is_general_delta: true,
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260 offset: 0,
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261 index: vec![],
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262 data: vec![],
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263 }
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264 }
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265
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266 pub fn with_inline(&mut self, value: bool) -> &mut Self {
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267 self.is_inline = value;
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268 self
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269 }
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270
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271 pub fn with_general_delta(&mut self, value: bool) -> &mut Self {
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272 self.is_general_delta = value;
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273 self
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274 }
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275
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276 pub fn with_version(&mut self, value: u16) -> &mut Self {
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277 self.version = value;
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278 self
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279 }
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280
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281 pub fn push(
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282 &mut self,
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283 mut index: IndexEntryBuilder,
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284 data: Vec<u8>,
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285 ) -> &mut Self {
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286 if self.index.is_empty() {
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287 index.is_first(true);
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288 index.with_general_delta(self.is_general_delta);
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289 index.with_inline(self.is_inline);
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290 index.with_version(self.version);
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291 } else {
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292 index.with_offset(self.offset);
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293 }
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294 self.index.push(index.build());
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295 self.offset += data.len();
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296 self.data.push(data);
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297 self
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298 }
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299
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300 pub fn build_inline(&self) -> Vec<u8> {
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301 let mut bytes =
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302 Vec::with_capacity(self.index.len() + self.data.len());
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303 for (index, data) in self.index.iter().zip(self.data.iter()) {
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304 bytes.extend(index);
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305 bytes.extend(data);
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306 }
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307 bytes
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308 }
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309 }
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310
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311 #[test]
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312 fn is_not_inline_when_no_inline_flag_test() {
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313 let bytes = RevlogBuilder::new()
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314 .with_general_delta(false)
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315 .with_inline(false)
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316 .push(IndexEntryBuilder::new(), vec![])
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317 .build_inline();
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318
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319 assert_eq!(is_inline(&bytes), false)
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320 }
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321
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322 #[test]
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323 fn is_inline_when_inline_flag_test() {
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324 let bytes = RevlogBuilder::new()
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325 .with_general_delta(false)
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326 .with_inline(true)
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327 .push(IndexEntryBuilder::new(), vec![])
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328 .build_inline();
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329
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330 assert_eq!(is_inline(&bytes), true)
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331 }
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332
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333 #[test]
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334 fn is_inline_when_inline_and_generaldelta_flags_test() {
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335 let bytes = RevlogBuilder::new()
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336 .with_general_delta(true)
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337 .with_inline(true)
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338 .push(IndexEntryBuilder::new(), vec![])
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339 .build_inline();
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340
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341 assert_eq!(is_inline(&bytes), true)
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342 }
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343
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344 #[test]
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345 fn version_test() {
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346 let bytes = RevlogBuilder::new()
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347 .with_version(1)
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348 .push(IndexEntryBuilder::new(), vec![])
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349 .build_inline();
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350
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351 assert_eq!(get_version(&bytes), 1)
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352 }
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353 }