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annotate rust/hg-pyo3/src/revlog/mod.rs @ 52782:827889802d11

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rust-pyo3-revlog: nodemap filling accessor This follows closely the original version in `hg-cpython`, with perhaps room for improvement to spare the caller with obscure and scary calls to `except()`.
author Georges Racinet <georges.racinet@cloudcrane.io>
date Wed, 25 Dec 2024 14:00:34 +0100
parents 42b219a1404a
children 5e3e8876fd9e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 use pyo3::buffer::PyBuffer;
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10 use pyo3::prelude::*;
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11 use pyo3::types::{PyBytes, PyBytesMethods, PyList};
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12 use pyo3_sharedref::PyShareable;
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13
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14 use std::sync::{atomic::AtomicUsize, RwLock};
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15
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16 use hg::{
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17 revlog::{
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18 index::Index, inner_revlog::InnerRevlog as CoreInnerRevlog,
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19 nodemap::NodeTree as CoreNodeTree, options::RevlogOpenOptions,
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20 RevlogIndex, RevlogType,
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21 },
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22 utils::files::get_path_from_bytes,
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23 vfs::FnCacheVfs,
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24 BaseRevision, Revision,
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25 };
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26
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27 use crate::{
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28 exceptions::{map_lock_error, nodemap_error, revlog_error_from_msg},
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29 store::PyFnCache,
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30 util::{new_submodule, take_buffer_with_slice},
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31 };
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32
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33 mod config;
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34 use config::*;
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35
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36 #[pyclass]
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37 #[allow(dead_code)]
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38 struct InnerRevlog {
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39 irl: PyShareable<CoreInnerRevlog>,
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40 nt: RwLock<Option<CoreNodeTree>>,
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41 docket: Option<PyObject>,
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42 // Holds a reference to the mmap'ed persistent nodemap data
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43 nodemap_mmap: Option<PyBuffer<u8>>,
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44 // Holds a reference to the mmap'ed persistent index data
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45 index_mmap: Option<PyBuffer<u8>>,
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46 revision_cache: Option<PyObject>,
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47 head_revs_py_list: Option<Py<PyList>>,
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48 head_node_ids_py_list: Option<Py<PyList>>,
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49 use_persistent_nodemap: bool,
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50 nodemap_queries: AtomicUsize,
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51 }
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52
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53 #[pymethods]
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54 impl InnerRevlog {
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55 #[new]
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56 // The Python side has authority on this signature.
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57 #[allow(clippy::too_many_arguments)]
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58 fn new(
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59 vfs_base: &Bound<'_, PyBytes>,
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60 fncache: &Bound<'_, PyAny>,
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61 vfs_is_readonly: bool,
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62 index_data: &Bound<'_, PyAny>,
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63 index_file: &Bound<'_, PyBytes>,
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64 data_file: &Bound<'_, PyBytes>,
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65 sidedata_file: &Bound<'_, PyAny>,
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66 inline: bool,
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67 data_config: &Bound<'_, PyAny>,
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68 delta_config: &Bound<'_, PyAny>,
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69 feature_config: &Bound<'_, PyAny>,
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70 chunk_cache: &Bound<'_, PyAny>,
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71 default_compression_header: &Bound<'_, PyAny>,
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72 revlog_type: usize,
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73 use_persistent_nodemap: bool,
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74 ) -> PyResult<Self> {
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75 // Let clippy accept the unused arguments. This is a bit better than
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76 // a blank `allow` directive
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77 let _ = sidedata_file;
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78 let _ = chunk_cache;
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79 let _ = default_compression_header;
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80
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81 let index_file = get_path_from_bytes(index_file.as_bytes()).to_owned();
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82 let data_file = get_path_from_bytes(data_file.as_bytes()).to_owned();
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83 let revlog_type = RevlogType::try_from(revlog_type)
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84 .map_err(revlog_error_from_msg)?;
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85 let data_config = extract_data_config(data_config, revlog_type)?;
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86 let delta_config = extract_delta_config(delta_config, revlog_type)?;
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87 let feature_config =
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88 extract_feature_config(feature_config, revlog_type)?;
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89 let options = RevlogOpenOptions::new(
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90 inline,
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91 data_config,
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92 delta_config,
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93 feature_config,
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94 );
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95
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96 // Safety: we keep the buffer around inside the returned instance as
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97 // `index_mmap`
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98 let (buf, bytes) = unsafe { take_buffer_with_slice(index_data)? };
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99 let index = Index::new(bytes, options.index_header())
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100 .map_err(revlog_error_from_msg)?;
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101
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102 let base = get_path_from_bytes(vfs_base.as_bytes()).to_owned();
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103 let core = CoreInnerRevlog::new(
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104 Box::new(FnCacheVfs::new(
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105 base,
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106 vfs_is_readonly,
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107 Box::new(PyFnCache::new(fncache.clone().unbind())),
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108 )),
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109 index,
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110 index_file,
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111 data_file,
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112 data_config,
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113 delta_config,
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114 feature_config,
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115 );
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116 Ok(Self {
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117 irl: core.into(),
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118 nt: None.into(),
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119 docket: None,
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120 nodemap_mmap: None,
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121 index_mmap: buf.into(),
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122 head_revs_py_list: None,
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123 head_node_ids_py_list: None,
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124 revision_cache: None,
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125 use_persistent_nodemap,
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126 nodemap_queries: AtomicUsize::new(0),
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127 })
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128 }
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129 }
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130
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131 impl InnerRevlog {
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132 /// Fill a [`CoreNodeTree`] by doing a full iteration on the given
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133 /// [`Index`]
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134 ///
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135 /// # Python exceptions
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136 /// Raises `ValueError` if `nt` has existing data that is inconsistent
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137 /// with `idx`.
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138 fn fill_nodemap(idx: &Index, nt: &mut CoreNodeTree) -> PyResult<()> {
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139 for r in 0..idx.len() {
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140 let rev = Revision(r as BaseRevision);
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141 // in this case node() won't ever return None
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142 nt.insert(idx, idx.node(rev).expect("node should exist"), rev)
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143 .map_err(nodemap_error)?
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144 }
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145 Ok(())
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146 }
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147
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148 /// Return a working NodeTree of this InnerRevlog
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149 ///
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150 /// In case the NodeTree has not been initialized yet (in particular
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151 /// not from persistent data at instantiation), it is created and
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152 /// filled right away from the index.
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153 ///
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154 /// Technically, the returned NodeTree is still behind the lock of
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155 /// the `nt` field, hence still wrapped in an [`Option`]. Callers
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156 /// will need to take the lock and unwrap with `expect()`.
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157 ///
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158 /// # Python exceptions
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159 /// The case mentioned in [`Self::fill_nodemap()`] cannot happen, as the
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160 /// NodeTree is empty when it is called.
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161 #[allow(dead_code)]
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162 fn get_nodetree(
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163 &self,
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164 idx: &Index,
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165 ) -> PyResult<&RwLock<Option<CoreNodeTree>>> {
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166 if self.nt.read().map_err(map_lock_error)?.is_none() {
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167 let readonly = Box::<Vec<_>>::default();
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168 let mut nt = CoreNodeTree::load_bytes(readonly, 0);
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169 Self::fill_nodemap(idx, &mut nt)?;
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170 self.nt.write().map_err(map_lock_error)?.replace(nt);
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171 }
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172 Ok(&self.nt)
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173 }
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174 }
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175
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176 pub fn init_module<'py>(
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177 py: Python<'py>,
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178 package: &str,
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179 ) -> PyResult<Bound<'py, PyModule>> {
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180 let m = new_submodule(py, package, "revlog")?;
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181 m.add_class::<InnerRevlog>()?;
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182 Ok(m)
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183 }