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annotate rust/hg-cpython/src/parsers.rs @ 45613:496537c9c1b4

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rust: start plugging the dirstate tree behind a feature gate The previous patch added the `dirstate-tree` feature gate to enable the two dirstate implementations to co-habit while the tree-based one gets better. This patch copies over the code that differs, be it because the algorithm changed or because the borrowing rules are different. Indeed, `DirstateTree` is not observationally equivalent to the std `HashMap` in the APIs we use: it does not have the `Entry` API (yet?) and its iterator returns owned values instead of references. This last point is because the implementation needs to be changed to a more clever and efficient solution. Differential Revision: https://phab.mercurial-scm.org/D9133
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 30 Sep 2020 18:10:29 +0200
parents 27424779c5b8
children 68a15b5a7e58
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1 // parsers.rs
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2 //
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3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 //! Bindings for the `hg::dirstate::parsers` module provided by the
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9 //! `hg-core` package.
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10 //!
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11 //! From Python, this will be seen as `mercurial.rustext.parsers`
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12 use cpython::{
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13 exc, PyBytes, PyDict, PyErr, PyInt, PyModule, PyResult, PyTuple, Python,
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14 PythonObject, ToPyObject,
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15 };
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16 use hg::{
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17 pack_dirstate, parse_dirstate, utils::hg_path::HgPathBuf, DirstateEntry,
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18 DirstatePackError, DirstateParents, DirstateParseError, FastHashMap,
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19 PARENT_SIZE,
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20 };
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21 use std::convert::TryInto;
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22
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23 use crate::dirstate::{extract_dirstate, make_dirstate_tuple};
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24 use std::time::Duration;
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25
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26 fn parse_dirstate_wrapper(
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27 py: Python,
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28 dmap: PyDict,
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29 copymap: PyDict,
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30 st: PyBytes,
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31 ) -> PyResult<PyTuple> {
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32 match parse_dirstate(st.data(py)) {
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33 Ok((parents, entries, copies)) => {
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34 let dirstate_map: FastHashMap<HgPathBuf, DirstateEntry> = entries
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35 .into_iter()
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36 .map(|(path, entry)| (path.to_owned(), entry))
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37 .collect();
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38 let copy_map: FastHashMap<HgPathBuf, HgPathBuf> = copies
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39 .into_iter()
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40 .map(|(path, copy)| (path.to_owned(), copy.to_owned()))
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41 .collect();
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42
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43 for (filename, entry) in &dirstate_map {
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44 dmap.set_item(
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45 py,
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46 PyBytes::new(py, filename.as_bytes()),
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47 make_dirstate_tuple(py, entry)?,
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48 )?;
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49 }
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50 for (path, copy_path) in copy_map {
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51 copymap.set_item(
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52 py,
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53 PyBytes::new(py, path.as_bytes()),
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54 PyBytes::new(py, copy_path.as_bytes()),
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55 )?;
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56 }
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57 Ok(
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58 (PyBytes::new(py, &parents.p1), PyBytes::new(py, &parents.p2))
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59 .to_py_object(py),
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60 )
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61 }
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62 Err(e) => Err(PyErr::new::<exc::ValueError, _>(
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63 py,
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64 match e {
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65 DirstateParseError::TooLittleData => {
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66 "too little data for parents".to_string()
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67 }
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68 DirstateParseError::Overflow => {
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69 "overflow in dirstate".to_string()
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70 }
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71 DirstateParseError::CorruptedEntry(e) => e,
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72 DirstateParseError::Damaged => {
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73 "dirstate appears to be damaged".to_string()
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74 }
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75 },
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76 )),
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77 }
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78 }
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79
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80 fn pack_dirstate_wrapper(
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81 py: Python,
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82 dmap: PyDict,
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83 copymap: PyDict,
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84 pl: PyTuple,
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85 now: PyInt,
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86 ) -> PyResult<PyBytes> {
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87 let p1 = pl.get_item(py, 0).extract::<PyBytes>(py)?;
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88 let p1: &[u8] = p1.data(py);
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89 let p2 = pl.get_item(py, 1).extract::<PyBytes>(py)?;
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90 let p2: &[u8] = p2.data(py);
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91
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92 let mut dirstate_map = extract_dirstate(py, &dmap)?;
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93
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94 let copies: Result<FastHashMap<HgPathBuf, HgPathBuf>, PyErr> = copymap
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95 .items(py)
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96 .iter()
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97 .map(|(key, value)| {
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98 Ok((
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99 HgPathBuf::from_bytes(key.extract::<PyBytes>(py)?.data(py)),
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100 HgPathBuf::from_bytes(value.extract::<PyBytes>(py)?.data(py)),
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101 ))
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102 })
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103 .collect();
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104
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105 if p1.len() != PARENT_SIZE || p2.len() != PARENT_SIZE {
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106 return Err(PyErr::new::<exc::ValueError, _>(
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107 py,
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108 "expected a 20-byte hash".to_string(),
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109 ));
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110 }
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111
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112 match pack_dirstate(
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113 &mut dirstate_map,
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114 &copies?,
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115 DirstateParents {
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116 p1: p1.try_into().unwrap(),
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117 p2: p2.try_into().unwrap(),
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118 },
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119 Duration::from_secs(now.as_object().extract::<u64>(py)?),
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120 ) {
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121 Ok(packed) => {
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122 for (filename, entry) in dirstate_map.iter() {
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123 dmap.set_item(
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124 py,
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125 PyBytes::new(py, filename.as_bytes()),
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126 make_dirstate_tuple(py, &entry)?,
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127 )?;
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128 }
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129 Ok(PyBytes::new(py, &packed))
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130 }
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131 Err(error) => Err(PyErr::new::<exc::ValueError, _>(
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132 py,
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133 match error {
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134 DirstatePackError::CorruptedParent => {
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135 "expected a 20-byte hash".to_string()
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136 }
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137 DirstatePackError::CorruptedEntry(e) => e,
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138 DirstatePackError::BadSize(expected, actual) => {
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139 format!("bad dirstate size: {} != {}", actual, expected)
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140 }
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141 },
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142 )),
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143 }
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144 }
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145
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146 /// Create the module, with `__package__` given from parent
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147 pub fn init_parsers_module(py: Python, package: &str) -> PyResult<PyModule> {
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148 let dotted_name = &format!("{}.parsers", package);
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149 let m = PyModule::new(py, dotted_name)?;
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150
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151 m.add(py, "__package__", package)?;
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152 m.add(py, "__doc__", "Parsers - Rust implementation")?;
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153
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154 m.add(
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155 py,
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156 "parse_dirstate",
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157 py_fn!(
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158 py,
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159 parse_dirstate_wrapper(dmap: PyDict, copymap: PyDict, st: PyBytes)
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160 ),
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161 )?;
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162 m.add(
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163 py,
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164 "pack_dirstate",
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165 py_fn!(
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166 py,
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167 pack_dirstate_wrapper(
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168 dmap: PyDict,
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169 copymap: PyDict,
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170 pl: PyTuple,
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171 now: PyInt
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172 )
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173 ),
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174 )?;
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175
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176 let sys = PyModule::import(py, "sys")?;
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177 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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178 sys_modules.set_item(py, dotted_name, &m)?;
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179
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180 Ok(m)
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181 }