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annotate rust/hg-cpython/src/cindex.rs @ 47034:0d8ff1f4ab0c

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revlog: add a `entry_binary` method on index The revlog index is already responsible for unpacking the binary entry, it would be simpler to make it responsible for packing them. In practice the C version of the index is already doing this internally. We introduce a "entry_binary" method that return the binary version of an existing revision. The method currently need to also take the revlog header to deal with the "first revision" special case. We will introduce further refactor in a later changeset to split that logic out. Differential Revision: https://phab.mercurial-scm.org/D10508
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Thu, 08 Apr 2021 00:01:11 +0200
parents 7d0405e458a0
children 9d1a8829f959
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1 // cindex.rs
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2 //
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3 // Copyright 2018 Georges Racinet <gracinet@anybox.fr>
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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 to use the Index defined by the parsers C extension
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9 //!
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10 //! Ideally, we should use an Index entirely implemented in Rust,
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11 //! but this will take some time to get there.
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12
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13 use cpython::{
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14 exc::ImportError, ObjectProtocol, PyClone, PyErr, PyObject, PyResult,
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15 PyTuple, Python, PythonObject,
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16 };
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17 use hg::revlog::{Node, RevlogIndex};
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18 use hg::{Graph, GraphError, Revision, WORKING_DIRECTORY_REVISION};
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19 use libc::{c_int, ssize_t};
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20
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21 const REVLOG_CABI_VERSION: c_int = 2;
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22
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23 #[repr(C)]
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24 pub struct Revlog_CAPI {
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25 abi_version: c_int,
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26 index_length:
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27 unsafe extern "C" fn(index: *mut revlog_capi::RawPyObject) -> ssize_t,
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28 index_node: unsafe extern "C" fn(
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29 index: *mut revlog_capi::RawPyObject,
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30 rev: ssize_t,
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31 ) -> *const Node,
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32 index_parents: unsafe extern "C" fn(
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33 index: *mut revlog_capi::RawPyObject,
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34 rev: c_int,
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35 ps: *mut [c_int; 2],
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36 ) -> c_int,
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37 }
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38
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39 py_capsule!(
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40 from mercurial.cext.parsers import revlog_CAPI
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41 as revlog_capi for Revlog_CAPI);
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42
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43 /// A `Graph` backed up by objects and functions from revlog.c
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44 ///
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45 /// This implementation of the `Graph` trait, relies on (pointers to)
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46 /// - the C index object (`index` member)
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47 /// - the `index_get_parents()` function (`parents` member)
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48 ///
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49 /// # Safety
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50 ///
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51 /// The C index itself is mutable, and this Rust exposition is **not
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52 /// protected by the GIL**, meaning that this construct isn't safe with respect
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53 /// to Python threads.
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54 ///
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55 /// All callers of this `Index` must acquire the GIL and must not release it
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56 /// while working.
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57 ///
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58 /// # TODO find a solution to make it GIL safe again.
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59 ///
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60 /// This is non trivial, and can wait until we have a clearer picture with
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61 /// more Rust Mercurial constructs.
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62 ///
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63 /// One possibility would be to a `GILProtectedIndex` wrapper enclosing
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64 /// a `Python<'p>` marker and have it be the one implementing the
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65 /// `Graph` trait, but this would mean the `Graph` implementor would become
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66 /// likely to change between subsequent method invocations of the `hg-core`
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67 /// objects (a serious change of the `hg-core` API):
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68 /// either exposing ways to mutate the `Graph`, or making it a non persistent
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69 /// parameter in the relevant methods that need one.
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70 ///
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71 /// Another possibility would be to introduce an abstract lock handle into
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72 /// the core API, that would be tied to `GILGuard` / `Python<'p>`
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73 /// in the case of the `cpython` crate bindings yet could leave room for other
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74 /// mechanisms in other contexts.
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75 pub struct Index {
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76 index: PyObject,
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77 capi: &'static Revlog_CAPI,
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78 }
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79
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80 impl Index {
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81 pub fn new(py: Python, index: PyObject) -> PyResult<Self> {
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82 let capi = unsafe { revlog_capi::retrieve(py)? };
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83 if capi.abi_version != REVLOG_CABI_VERSION {
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84 return Err(PyErr::new::<ImportError, _>(
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85 py,
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86 format!(
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87 "ABI version mismatch: the C ABI revlog version {} \
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88 does not match the {} expected by Rust hg-cpython",
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89 capi.abi_version, REVLOG_CABI_VERSION
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90 ),
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91 ));
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92 }
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93 Ok(Index { index, capi })
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94 }
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95
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96 /// return a reference to the CPython Index object in this Struct
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97 pub fn inner(&self) -> &PyObject {
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98 &self.index
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99 }
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100
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101 pub fn append(&mut self, py: Python, tup: PyTuple) -> PyResult<PyObject> {
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102 self.index.call_method(
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103 py,
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104 "append",
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105 PyTuple::new(py, &[tup.into_object()]),
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106 None,
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107 )
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108 }
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109 }
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110
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111 impl Clone for Index {
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112 fn clone(&self) -> Self {
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113 let guard = Python::acquire_gil();
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114 Index {
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115 index: self.index.clone_ref(guard.python()),
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116 capi: self.capi,
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117 }
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118 }
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119 }
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120
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121 impl PyClone for Index {
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122 fn clone_ref(&self, py: Python) -> Self {
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123 Index {
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124 index: self.index.clone_ref(py),
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125 capi: self.capi,
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126 }
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127 }
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128 }
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129
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130 impl Graph for Index {
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131 /// wrap a call to the C extern parents function
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132 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
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133 if rev == WORKING_DIRECTORY_REVISION {
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134 return Err(GraphError::WorkingDirectoryUnsupported);
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135 }
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136 let mut res: [c_int; 2] = [0; 2];
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137 let code = unsafe {
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138 (self.capi.index_parents)(
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139 self.index.as_ptr(),
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140 rev as c_int,
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141 &mut res as *mut [c_int; 2],
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142 )
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143 };
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144 match code {
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145 0 => Ok(res),
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146 _ => Err(GraphError::ParentOutOfRange(rev)),
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147 }
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148 }
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149 }
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150
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151 impl RevlogIndex for Index {
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152 /// Note C return type is Py_ssize_t (hence signed), but we shall
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153 /// force it to unsigned, because it's a length
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154 fn len(&self) -> usize {
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155 unsafe { (self.capi.index_length)(self.index.as_ptr()) as usize }
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156 }
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157
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158 fn node(&self, rev: Revision) -> Option<&Node> {
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159 let raw = unsafe {
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160 (self.capi.index_node)(self.index.as_ptr(), rev as ssize_t)
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161 };
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162 if raw.is_null() {
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163 None
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164 } else {
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165 // TODO it would be much better for the C layer to give us
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166 // a length, since the hash length will change in the near
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167 // future, but that's probably out of scope for the nodemap
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168 // patch series.
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169 //
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170 // The root of that unsafety relies in the signature of
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171 // `capi.index_node()` itself: returning a `Node` pointer
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172 // whereas it's a `char *` in the C counterpart.
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173 Some(unsafe { &*raw })
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174 }
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175 }
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176 }