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annotate rust/hg-cpython/src/copy_tracing.rs @ 46569:34827c95092c

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copies-rust: remove the ancestor Oracle logic We are not doing any `is_ancestor` call anymore. So we can drop that logic and associated arguments. Differential Revision: https://phab.mercurial-scm.org/D9645
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 15 Dec 2020 18:22:57 +0100
parents 294d5aca4ff5
children cb4b0b0c6de4
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1 use cpython::ObjectProtocol;
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2 use cpython::PyBytes;
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3 use cpython::PyDict;
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4 use cpython::PyList;
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5 use cpython::PyModule;
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6 use cpython::PyObject;
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7 use cpython::PyResult;
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8 use cpython::PyTuple;
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9 use cpython::Python;
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10
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11 use hg::copy_tracing::combine_changeset_copies;
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12 use hg::copy_tracing::ChangedFiles;
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13 use hg::copy_tracing::DataHolder;
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14 use hg::copy_tracing::RevInfo;
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15 use hg::copy_tracing::RevInfoMaker;
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16 use hg::Revision;
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17
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18 /// Combines copies information contained into revision `revs` to build a copy
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19 /// map.
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20 ///
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21 /// See mercurial/copies.py for details
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22 pub fn combine_changeset_copies_wrapper(
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23 py: Python,
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24 revs: PyList,
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25 children_count: PyDict,
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26 target_rev: Revision,
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27 rev_info: PyObject,
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28 ) -> PyResult<PyDict> {
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29 let revs: PyResult<_> =
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30 revs.iter(py).map(|r| Ok(r.extract(py)?)).collect();
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31
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32 // Wrap the `rev_info_maker` python callback as a Rust closure
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33 //
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34 // No errors are expected from the Python side, and they will should only
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35 // happens in case of programing error or severe data corruption. Such
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36 // errors will raise panic and the rust-cpython harness will turn them into
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37 // Python exception.
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38 let rev_info_maker: RevInfoMaker<PyBytes> =
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39 Box::new(|rev: Revision, d: &mut DataHolder<PyBytes>| -> RevInfo {
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40 let res: PyTuple = rev_info
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41 .call(py, (rev,), None)
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42 .expect("rust-copy-tracing: python call to `rev_info` failed")
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43 .cast_into(py)
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44 .expect(
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45 "rust-copy_tracing: python call to `rev_info` returned \
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46 unexpected non-Tuple value",
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47 );
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48 let p1 = res.get_item(py, 0).extract(py).expect(
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49 "rust-copy-tracing: rev_info return is invalid, first item \
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50 is a not a revision",
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51 );
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52 let p2 = res.get_item(py, 1).extract(py).expect(
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53 "rust-copy-tracing: rev_info return is invalid, first item \
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54 is a not a revision",
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55 );
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56
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57 let files = match res.get_item(py, 2).extract::<PyBytes>(py) {
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58 Ok(raw) => {
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59 // Give responsability for the raw bytes lifetime to
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60 // hg-core
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61 d.data = Some(raw);
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62 let addrs = d.data.as_ref().expect(
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63 "rust-copy-tracing: failed to get a reference to the \
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64 raw bytes for copy data").data(py);
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65 ChangedFiles::new(addrs)
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66 }
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67 // value was presumably None, meaning they was no copy data.
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68 Err(_) => ChangedFiles::new_empty(),
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69 };
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70
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71 (p1, p2, files)
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72 });
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73 let children_count: PyResult<_> = children_count
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74 .items(py)
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75 .iter()
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76 .map(|(k, v)| Ok((k.extract(py)?, v.extract(py)?)))
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77 .collect();
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78
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79 let res = combine_changeset_copies(
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80 revs?,
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81 children_count?,
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82 target_rev,
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83 rev_info_maker,
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84 );
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85 let out = PyDict::new(py);
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86 for (dest, source) in res.into_iter() {
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87 out.set_item(
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88 py,
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89 PyBytes::new(py, &dest.into_vec()),
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90 PyBytes::new(py, &source.into_vec()),
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91 )?;
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92 }
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93 Ok(out)
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94 }
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95
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96 /// Create the module, with `__package__` given from parent
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97 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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98 let dotted_name = &format!("{}.copy_tracing", package);
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99 let m = PyModule::new(py, dotted_name)?;
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100
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101 m.add(py, "__package__", package)?;
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102 m.add(py, "__doc__", "Copy tracing - Rust implementation")?;
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103
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104 m.add(
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105 py,
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106 "combine_changeset_copies",
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107 py_fn!(
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108 py,
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109 combine_changeset_copies_wrapper(
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110 revs: PyList,
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111 children: PyDict,
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112 target_rev: Revision,
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113 rev_info: PyObject
45945
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114 )
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115 ),
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116 )?;
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117
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118 let sys = PyModule::import(py, "sys")?;
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119 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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120 sys_modules.set_item(py, dotted_name, &m)?;
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121
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122 Ok(m)
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123 }