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annotate rust/hg-pyo3/src/revlog/mod.rs @ 52788:e29e75e8328c

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rust-pyo3-revlog: index and notetree writing accessors It works in the same way as their reading counterparts, given that we are leveraging the inner mutability of the `PyShareable` for the index and of the main object for the nodetree.
author Georges Racinet <georges.racinet@cloudcrane.io>
date Wed, 25 Dec 2024 17:17:40 +0100
parents e5f89bd1a5ee
children 34f44aa5e844
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1 // revlog.rs
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2 //
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3 // Copyright 2019-2020 Georges Racinet <georges.racinet@octobus.net>
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4 // 2020-2024 Raphaël Gomès <raphael.gomes@octobus.net>
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5 // 2024 Georges Racinet <georges.racinet@cloudcrane.io>
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6 //
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7 // This software may be used and distributed according to the terms of the
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8 // GNU General Public License version 2 or any later version.
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9 #![allow(non_snake_case)]
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10 use pyo3::buffer::PyBuffer;
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11 use pyo3::prelude::*;
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12 use pyo3::types::{PyBytes, PyBytesMethods, PyList};
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13 use pyo3_sharedref::PyShareable;
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14
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15 use std::sync::{
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16 atomic::{AtomicUsize, Ordering},
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17 RwLock, RwLockReadGuard, RwLockWriteGuard,
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18 };
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19
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20 use hg::{
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21 revlog::{
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22 index::Index,
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23 inner_revlog::InnerRevlog as CoreInnerRevlog,
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24 nodemap::{NodeMap, NodeTree as CoreNodeTree},
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25 options::RevlogOpenOptions,
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26 RevlogIndex, RevlogType,
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27 },
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28 utils::files::get_path_from_bytes,
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29 vfs::FnCacheVfs,
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30 BaseRevision, Revision,
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31 };
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32
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33 use crate::{
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34 exceptions::{
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35 map_lock_error, map_try_lock_error, nodemap_error, revlog_error_bare,
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36 revlog_error_from_msg,
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37 },
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38 node::{node_from_py_bytes, node_prefix_from_py_bytes, py_node_for_rev},
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39 revision::PyRevision,
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40 store::PyFnCache,
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41 util::{new_submodule, take_buffer_with_slice},
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42 };
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43
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44 mod config;
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45 use config::*;
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46
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47 #[pyclass]
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48 #[allow(dead_code)]
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49 struct InnerRevlog {
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50 irl: PyShareable<CoreInnerRevlog>,
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51 nt: RwLock<Option<CoreNodeTree>>,
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52 docket: Option<PyObject>,
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53 // Holds a reference to the mmap'ed persistent nodemap data
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54 nodemap_mmap: Option<PyBuffer<u8>>,
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55 // Holds a reference to the mmap'ed persistent index data
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56 index_mmap: Option<PyBuffer<u8>>,
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57 revision_cache: Option<PyObject>,
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58 head_revs_py_list: Option<Py<PyList>>,
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59 head_node_ids_py_list: Option<Py<PyList>>,
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60 use_persistent_nodemap: bool,
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61 nodemap_queries: AtomicUsize,
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62 }
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63
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64 #[pymethods]
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65 impl InnerRevlog {
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66 #[new]
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67 // The Python side has authority on this signature.
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68 #[allow(clippy::too_many_arguments)]
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69 fn new(
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70 vfs_base: &Bound<'_, PyBytes>,
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71 fncache: &Bound<'_, PyAny>,
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72 vfs_is_readonly: bool,
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73 index_data: &Bound<'_, PyAny>,
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74 index_file: &Bound<'_, PyBytes>,
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75 data_file: &Bound<'_, PyBytes>,
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76 sidedata_file: &Bound<'_, PyAny>,
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77 inline: bool,
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78 data_config: &Bound<'_, PyAny>,
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79 delta_config: &Bound<'_, PyAny>,
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80 feature_config: &Bound<'_, PyAny>,
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81 chunk_cache: &Bound<'_, PyAny>,
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82 default_compression_header: &Bound<'_, PyAny>,
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83 revlog_type: usize,
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84 use_persistent_nodemap: bool,
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85 ) -> PyResult<Self> {
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86 // Let clippy accept the unused arguments. This is a bit better than
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87 // a blank `allow` directive
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88 let _ = sidedata_file;
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89 let _ = chunk_cache;
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90 let _ = default_compression_header;
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91
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92 let index_file = get_path_from_bytes(index_file.as_bytes()).to_owned();
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93 let data_file = get_path_from_bytes(data_file.as_bytes()).to_owned();
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94 let revlog_type = RevlogType::try_from(revlog_type)
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95 .map_err(revlog_error_from_msg)?;
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96 let data_config = extract_data_config(data_config, revlog_type)?;
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97 let delta_config = extract_delta_config(delta_config, revlog_type)?;
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98 let feature_config =
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99 extract_feature_config(feature_config, revlog_type)?;
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100 let options = RevlogOpenOptions::new(
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101 inline,
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102 data_config,
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103 delta_config,
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104 feature_config,
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105 );
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106
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107 // Safety: we keep the buffer around inside the returned instance as
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108 // `index_mmap`
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109 let (buf, bytes) = unsafe { take_buffer_with_slice(index_data)? };
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110 let index = Index::new(bytes, options.index_header())
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111 .map_err(revlog_error_from_msg)?;
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112
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113 let base = get_path_from_bytes(vfs_base.as_bytes()).to_owned();
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114 let core = CoreInnerRevlog::new(
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115 Box::new(FnCacheVfs::new(
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116 base,
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117 vfs_is_readonly,
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118 Box::new(PyFnCache::new(fncache.clone().unbind())),
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119 )),
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120 index,
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121 index_file,
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122 data_file,
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123 data_config,
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124 delta_config,
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125 feature_config,
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126 );
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127 Ok(Self {
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128 irl: core.into(),
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129 nt: None.into(),
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130 docket: None,
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131 nodemap_mmap: None,
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132 index_mmap: buf.into(),
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133 head_revs_py_list: None,
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134 head_node_ids_py_list: None,
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135 revision_cache: None,
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136 use_persistent_nodemap,
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137 nodemap_queries: AtomicUsize::new(0),
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138 })
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139 }
52786
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140
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141 //
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142 // -- forwarded index methods --
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143 //
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144
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145 fn _index_get_rev(
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146 slf: &Bound<'_, Self>,
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147 node: &Bound<'_, PyBytes>,
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148 ) -> PyResult<Option<PyRevision>> {
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149 let node = node_from_py_bytes(node)?;
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150
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151 // Do not rewrite this with `Self::with_index_nt_read`: it makes
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152 // inconditionally a volatile nodetree, and that is not the intent
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153 // here: the code below specifically avoids that.
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154 Self::with_core_read(slf, |self_ref, irl| {
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155 let idx = &irl.index;
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156
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157 let prev_queries =
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158 self_ref.nodemap_queries.fetch_add(1, Ordering::Relaxed);
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159 // Filelogs have no persistent nodemaps and are often small,
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160 // use a brute force lookup from the end
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161 // backwards. If there is a very large filelog
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162 // (automation file that changes every
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163 // commit etc.), it also seems to work quite well for
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164 // all measured purposes so far.
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165 if !self_ref.use_persistent_nodemap && prev_queries <= 3 {
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166 return Ok(idx
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167 .rev_from_node_no_persistent_nodemap(node.into())
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168 .ok()
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169 .map(Into::into));
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170 }
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171
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172 let opt =
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173 self_ref.get_nodetree(idx)?.read().map_err(map_lock_error)?;
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174 let nt = opt.as_ref().expect("nodetree should be set");
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175
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176 let rust_rev =
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177 nt.find_bin(idx, node.into()).map_err(nodemap_error)?;
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178 Ok(rust_rev.map(Into::into))
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179 })
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180 }
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181
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182 /// same as `_index_get_rev()` but raises a bare `error.RevlogError` if
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183 /// node is not found.
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184 ///
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185 /// No need to repeat `node` in the exception, `mercurial/revlog.py`
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186 /// will catch and rewrap with it
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187 fn _index_rev(
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188 slf: &Bound<'_, Self>,
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189 node: &Bound<'_, PyBytes>,
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190 ) -> PyResult<PyRevision> {
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191 Self::_index_get_rev(slf, node)?.ok_or_else(revlog_error_bare)
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192 }
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193
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194 /// return True if the node exist in the index
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195 fn _index_has_node(
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196 slf: &Bound<'_, Self>,
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197 node: &Bound<'_, PyBytes>,
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198 ) -> PyResult<bool> {
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199 Self::_index_get_rev(slf, node).map(|opt| opt.is_some())
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200 }
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201
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202 /// find length of shortest hex nodeid of a binary ID
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203 fn _index_shortest(
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204 slf: &Bound<'_, Self>,
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205 node: &Bound<'_, PyBytes>,
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206 ) -> PyResult<usize> {
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207 Self::with_index_nt_read(slf, |idx, nt| {
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208 match nt.unique_prefix_len_node(idx, &node_from_py_bytes(node)?) {
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209 Ok(Some(l)) => Ok(l),
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210 Ok(None) => Err(revlog_error_bare()),
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211 Err(e) => Err(nodemap_error(e)),
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212 }
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213 })
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214 }
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215
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216 fn _index_partialmatch<'py>(
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217 slf: &Bound<'py, Self>,
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218 node: &Bound<'py, PyBytes>,
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219 ) -> PyResult<Option<Bound<'py, PyBytes>>> {
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220 Self::with_index_nt_read(slf, |idx, nt| {
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221 Ok(nt
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222 .find_bin(idx, node_prefix_from_py_bytes(node)?)
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223 .map_err(nodemap_error)?
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224 .map(|rev| py_node_for_rev(slf.py(), idx, rev)))
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225 })
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226 }
52787
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227
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228 fn _index___len__(slf: &Bound<'_, Self>) -> PyResult<usize> {
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229 Self::with_index_read(slf, |idx| Ok(idx.len()))
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230 }
52780
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231 }
52778
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232
52782
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233 impl InnerRevlog {
52784
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234 /// Take the lock on `slf.irl` for reading and call a closure.
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235 ///
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236 /// This serves the purpose to keep the needed intermediate [`PyRef`]
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237 /// that must be obtained to access the data from the [`Bound`] reference
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238 /// and of which the locked [`CoreInnerRevlog`] depends.
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239 /// This also provides releasing of the [`PyRef`] as soon as the closure
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240 /// is done, which is crucial if the caller needs to obtain a [`PyRefMut`]
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241 /// later on.
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242 ///
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243 /// In the closure, we hand back the intermediate [`PyRef`] that
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244 /// has been generated so that the closure can access more attributes.
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245 fn with_core_read<'py, T>(
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246 slf: &Bound<'py, Self>,
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247 f: impl FnOnce(
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248 &PyRef<'py, Self>,
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249 RwLockReadGuard<CoreInnerRevlog>,
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250 ) -> PyResult<T>,
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251 ) -> PyResult<T> {
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252 let self_ref = slf.borrow();
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253 // Safety: the owner is the right one. We will anyway
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254 // not actually `share` it. Perhaps pyo3-sharedref should provide
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255 // something less scary for this kind of usage.
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256 let shareable_ref = unsafe { self_ref.irl.borrow_with_owner(slf) };
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257 let guard = shareable_ref.try_read().map_err(map_try_lock_error)?;
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258 f(&self_ref, guard)
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259 }
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260
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261 #[allow(dead_code)]
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262 /// Take the lock on `slf.irl` for writing and call a closure.
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263 ///
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264 /// See [`Self::with_core_read`] for more explanations.
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265 fn with_core_write<'py, T>(
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266 slf: &Bound<'py, Self>,
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267 f: impl FnOnce(
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268 &PyRef<'py, Self>,
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269 RwLockWriteGuard<CoreInnerRevlog>,
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270 ) -> PyResult<T>,
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271 ) -> PyResult<T> {
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272 let self_ref = slf.borrow();
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273 // Safety: the owner is the right one. We will anyway
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274 // not actually `share` it. Perhaps pyo3-sharedref should provide
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275 // something less scary for this kind of usage.
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276 let shareable_ref = unsafe { self_ref.irl.borrow_with_owner(slf) };
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277 let guard = shareable_ref.try_write().map_err(map_try_lock_error)?;
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278 f(&self_ref, guard)
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279 }
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280
52784
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281 fn with_index_read<T>(
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282 slf: &Bound<'_, Self>,
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283 f: impl FnOnce(&Index) -> PyResult<T>,
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284 ) -> PyResult<T> {
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285 Self::with_core_read(slf, |_, guard| f(&guard.index))
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286 }
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287
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288 #[allow(dead_code)]
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289 fn with_index_write<T>(
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290 slf: &Bound<'_, Self>,
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291 f: impl FnOnce(&mut Index) -> PyResult<T>,
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292 ) -> PyResult<T> {
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293 Self::with_core_write(slf, |_, mut guard| f(&mut guard.index))
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294 }
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295
52784
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296 /// Lock `slf` for reading and execute a closure on its [`Index`] and
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297 /// [`NodeTree`]
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298 ///
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299 /// The [`NodeTree`] is initialized an filled before hand if needed.
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300 fn with_index_nt_read<T>(
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301 slf: &Bound<'_, Self>,
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302 f: impl FnOnce(&Index, &CoreNodeTree) -> PyResult<T>,
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303 ) -> PyResult<T> {
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304 Self::with_core_read(slf, |self_ref, guard| {
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305 let idx = &guard.index;
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306 let nt =
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307 self_ref.get_nodetree(idx)?.read().map_err(map_lock_error)?;
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308 let nt = nt.as_ref().expect("nodetree should be set");
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309 f(idx, nt)
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310 })
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311 }
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312
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313 #[allow(dead_code)]
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314 fn with_index_nt_write<T>(
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315 slf: &Bound<'_, Self>,
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316 f: impl FnOnce(&mut Index, &mut CoreNodeTree) -> PyResult<T>,
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317 ) -> PyResult<T> {
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318 Self::with_core_write(slf, |self_ref, mut guard| {
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319 let idx = &mut guard.index;
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320 let mut nt = self_ref
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321 .get_nodetree(idx)?
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322 .write()
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323 .map_err(map_lock_error)?;
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324 let nt = nt.as_mut().expect("nodetree should be set");
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325 f(idx, nt)
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326 })
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327 }
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328
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329 /// Fill a [`CoreNodeTree`] by doing a full iteration on the given
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330 /// [`Index`]
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331 ///
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332 /// # Python exceptions
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333 /// Raises `ValueError` if `nt` has existing data that is inconsistent
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334 /// with `idx`.
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335 fn fill_nodemap(idx: &Index, nt: &mut CoreNodeTree) -> PyResult<()> {
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336 for r in 0..idx.len() {
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337 let rev = Revision(r as BaseRevision);
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338 // in this case node() won't ever return None
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339 nt.insert(idx, idx.node(rev).expect("node should exist"), rev)
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340 .map_err(nodemap_error)?
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341 }
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342 Ok(())
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343 }
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344
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345 /// Return a working NodeTree of this InnerRevlog
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346 ///
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347 /// In case the NodeTree has not been initialized yet (in particular
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348 /// not from persistent data at instantiation), it is created and
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349 /// filled right away from the index.
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350 ///
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351 /// Technically, the returned NodeTree is still behind the lock of
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352 /// the `nt` field, hence still wrapped in an [`Option`]. Callers
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353 /// will need to take the lock and unwrap with `expect()`.
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354 ///
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355 /// # Python exceptions
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356 /// The case mentioned in [`Self::fill_nodemap()`] cannot happen, as the
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357 /// NodeTree is empty when it is called.
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358 fn get_nodetree(
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359 &self,
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360 idx: &Index,
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361 ) -> PyResult<&RwLock<Option<CoreNodeTree>>> {
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362 if self.nt.read().map_err(map_lock_error)?.is_none() {
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363 let readonly = Box::<Vec<_>>::default();
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364 let mut nt = CoreNodeTree::load_bytes(readonly, 0);
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365 Self::fill_nodemap(idx, &mut nt)?;
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366 self.nt.write().map_err(map_lock_error)?.replace(nt);
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367 }
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368 Ok(&self.nt)
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369 }
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370 }
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371
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372 pub fn init_module<'py>(
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373 py: Python<'py>,
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374 package: &str,
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375 ) -> PyResult<Bound<'py, PyModule>> {
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376 let m = new_submodule(py, package, "revlog")?;
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377 m.add_class::<InnerRevlog>()?;
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378 Ok(m)
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379 }