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annotate rust/hg-core/examples/nodemap/main.rs @ 49987:58074252db3c

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rust: run `cargo clippy` These automatic fixes are good to have because they make the code more idiomatic and less surprising. The transform from `sort` -> `sort_unstable` is questionable, but this is only in a test, so it doesn't matter in our case.
author Rapha?l Gom?s <rgomes@octobus.net>
date Mon, 09 Jan 2023 17:40:03 +0100
parents 14bfd22a57a9
children 0d301f4180f5
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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 = rev as Revision;
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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(&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(|_| *index.node((rng.gen::<u32>() % len) as Revision).unwrap())
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59 .collect();
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60 if queries < 10 {
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61 let nodes_hex: Vec<String> =
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62 nodes.iter().map(|n| format!("{:x}", n)).collect();
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63 println!("Nodes: {:?}", nodes_hex);
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64 }
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65 let mut last: Option<Revision> = None;
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66 let start = Instant::now();
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67 for node in nodes.iter() {
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68 last = nm.find_bin(index, node.into()).unwrap();
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69 }
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70 let elapsed = start.elapsed();
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71 println!(
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72 "Did {} queries in {:?} (mean {:?}), last was {:x} with result {:?}",
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73 queries,
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74 elapsed,
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75 elapsed / (queries as u32),
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76 nodes.last().unwrap(),
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77 last
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78 );
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79 }
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80
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81 fn main() {
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82 use clap::{Parser, Subcommand};
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83
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84 #[derive(Parser)]
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85 #[command()]
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86 /// Nodemap pure Rust example
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87 struct App {
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88 // Path to the repository, always necessary for its index
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89 #[arg(short, long)]
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90 repository: PathBuf,
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91 // Path to the nodemap file, independent of REPOSITORY
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92 #[arg(short, long)]
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93 nodemap_file: PathBuf,
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94 #[command(subcommand)]
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95 command: Command,
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96 }
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97
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98 #[derive(Subcommand)]
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99 enum Command {
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100 /// Create `NODEMAP_FILE` by scanning repository index
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101 Create,
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102 /// Query `NODEMAP_FILE` for `prefix`
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103 Query { prefix: String },
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104 /// Perform #`QUERIES` random successful queries on `NODEMAP_FILE`
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105 Bench { queries: usize },
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106 }
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107
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108 let app = App::parse();
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109
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110 let repo = &app.repository;
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111 let nm_path = &app.nodemap_file;
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112
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113 let index = mmap_index(repo);
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114 let nm = mmap_nodemap(nm_path);
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115
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116 match &app.command {
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117 Command::Create => {
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118 println!(
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119 "Creating nodemap file {} for repository {}",
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120 nm_path.display(),
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121 repo.display()
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122 );
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123 create(&index, Path::new(nm_path)).unwrap();
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124 }
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125 Command::Bench { queries } => {
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126 println!(
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127 "Doing {} random queries in nodemap file {} of repository {}",
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128 queries,
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129 nm_path.display(),
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130 repo.display()
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131 );
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132 bench(&index, &nm, *queries);
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133 }
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134 Command::Query { prefix } => {
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135 println!(
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136 "Querying {} in nodemap file {} of repository {}",
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137 prefix,
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138 nm_path.display(),
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139 repo.display()
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140 );
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141 query(&index, &nm, prefix);
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142 }
44417
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143 }
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144 }