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annotate rust/hg-core/examples/nodemap/main.rs @ 50990:4c5f6e95df84

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rust: make `Revision` a newtype This change is the one we've been building towards during this series. The aim is to make `Revision` mean more than a simple integer, holding the information that it is valid for a given revlog index. While this still allows for programmer error, since creating a revision directly and querying a different index with a "checked" revision are still possible, the friction created by the newtype will hopefully make us think twice about which type to use. Enough of the Rust ecosystem relies on the newtype pattern to be efficiently optimized away (even compiler in codegen tests?), so I'm not worried about this being a fundamental problem. [1] https://github.com/rust-lang/rust/blob/7a70647f195f6b0a0f1ebd72b1542ba91a32f43a/tests/codegen/vec-in-place.rs#L47
author Rapha?l Gom?s <rgomes@octobus.net>
date Fri, 18 Aug 2023 14:34:29 +0200
parents 0d301f4180f5
children
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1 // Copyright 2019-2020 Georges Racinet <georges.racinet@octobus.net>
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2 //
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3 // This software may be used and distributed according to the terms of the
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4 // GNU General Public License version 2 or any later version.
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5
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6 use hg::revlog::node::*;
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7 use hg::revlog::nodemap::*;
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8 use hg::revlog::*;
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9 use memmap2::MmapOptions;
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10 use rand::Rng;
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11 use std::fs::File;
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12 use std::io;
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13 use std::io::Write;
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14 use std::path::{Path, PathBuf};
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15 use std::time::Instant;
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16
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17 mod index;
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18 use index::Index;
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19
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20 fn mmap_index(repo_path: &Path) -> Index {
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21 let mut path = PathBuf::from(repo_path);
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22 path.extend([".hg", "store", "00changelog.i"].iter());
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23 Index::load_mmap(path)
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24 }
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25
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26 fn mmap_nodemap(path: &Path) -> NodeTree {
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27 let file = File::open(path).unwrap();
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28 let mmap = unsafe { MmapOptions::new().map(&file).unwrap() };
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29 let len = mmap.len();
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30 NodeTree::load_bytes(Box::new(mmap), len)
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31 }
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32
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33 /// Scan the whole index and create the corresponding nodemap file at `path`
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34 fn create(index: &Index, path: &Path) -> io::Result<()> {
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35 let mut file = File::create(path)?;
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36 let start = Instant::now();
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37 let mut nm = NodeTree::default();
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38 for rev in 0..index.len() {
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39 let rev = Revision(rev as BaseRevision);
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40 nm.insert(index, index.node(rev).unwrap(), rev).unwrap();
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41 }
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42 eprintln!("Nodemap constructed in RAM in {:?}", start.elapsed());
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43 file.write_all(&nm.into_readonly_and_added_bytes().1)?;
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44 eprintln!("Nodemap written to disk");
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45 Ok(())
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46 }
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47
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48 fn query(index: &Index, nm: &NodeTree, prefix: &str) {
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49 let start = Instant::now();
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50 let res = NodePrefix::from_hex(prefix).map(|p| nm.find_bin(index, p));
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51 println!("Result found in {:?}: {:?}", start.elapsed(), res);
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52 }
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53
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54 fn bench(index: &Index, nm: &NodeTree, queries: usize) {
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55 let len = index.len() as u32;
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56 let mut rng = rand::thread_rng();
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57 let nodes: Vec<Node> = (0..queries)
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58 .map(|_| {
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59 *index
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60 .node(Revision((rng.gen::<u32>() % len) as BaseRevision))
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61 .unwrap()
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62 })
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63 .collect();
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64 if queries < 10 {
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65 let nodes_hex: Vec<String> =
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66 nodes.iter().map(|n| format!("{:x}", n)).collect();
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67 println!("Nodes: {:?}", nodes_hex);
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68 }
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69 let mut last: Option<Revision> = None;
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70 let start = Instant::now();
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71 for node in nodes.iter() {
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72 last = nm.find_bin(index, node.into()).unwrap();
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73 }
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74 let elapsed = start.elapsed();
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75 println!(
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76 "Did {} queries in {:?} (mean {:?}), last was {:x} with result {:?}",
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77 queries,
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78 elapsed,
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79 elapsed / (queries as u32),
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80 nodes.last().unwrap(),
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81 last
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82 );
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83 }
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84
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85 fn main() {
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86 use clap::{Parser, Subcommand};
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87
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88 #[derive(Parser)]
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89 #[command()]
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90 /// Nodemap pure Rust example
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91 struct App {
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92 // Path to the repository, always necessary for its index
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93 #[arg(short, long)]
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94 repository: PathBuf,
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95 // Path to the nodemap file, independent of REPOSITORY
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96 #[arg(short, long)]
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97 nodemap_file: PathBuf,
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98 #[command(subcommand)]
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99 command: Command,
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100 }
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101
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102 #[derive(Subcommand)]
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103 enum Command {
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104 /// Create `NODEMAP_FILE` by scanning repository index
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105 Create,
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106 /// Query `NODEMAP_FILE` for `prefix`
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107 Query { prefix: String },
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108 /// Perform #`QUERIES` random successful queries on `NODEMAP_FILE`
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109 Bench { queries: usize },
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110 }
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111
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112 let app = App::parse();
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113
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114 let repo = &app.repository;
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115 let nm_path = &app.nodemap_file;
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116
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117 let index = mmap_index(repo);
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118 let nm = mmap_nodemap(nm_path);
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119
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120 match &app.command {
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121 Command::Create => {
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122 println!(
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123 "Creating nodemap file {} for repository {}",
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124 nm_path.display(),
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125 repo.display()
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126 );
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127 create(&index, Path::new(nm_path)).unwrap();
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128 }
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129 Command::Bench { queries } => {
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130 println!(
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131 "Doing {} random queries in nodemap file {} of repository {}",
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132 queries,
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133 nm_path.display(),
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134 repo.display()
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135 );
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136 bench(&index, &nm, *queries);
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137 }
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138 Command::Query { prefix } => {
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139 println!(
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140 "Querying {} in nodemap file {} of repository {}",
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141 prefix,
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142 nm_path.display(),
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143 repo.display()
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144 );
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145 query(&index, &nm, prefix);
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146 }
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147 }
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148 }