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annotate rust/hg-cpython/src/utils.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 26114bd6ec60
children c7fb9b74e753
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use cpython::exc::ValueError;
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2 use cpython::{PyBytes, PyDict, PyErr, PyObject, PyResult, PyTuple, Python};
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3 use hg::revlog::Node;
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4 use std::convert::TryFrom;
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5
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6 #[allow(unused)]
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7 pub fn print_python_trace(py: Python) -> PyResult<PyObject> {
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8 eprintln!("===============================");
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9 eprintln!("Printing Python stack from Rust");
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10 eprintln!("===============================");
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11 let traceback = py.import("traceback")?;
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12 let sys = py.import("sys")?;
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13 let kwargs = PyDict::new(py);
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14 kwargs.set_item(py, "file", sys.get(py, "stderr")?)?;
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15 traceback.call(py, "print_stack", PyTuple::new(py, &[]), Some(&kwargs))
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16 }
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18 // Necessary evil for the time being, could maybe be moved to
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19 // a TryFrom in Node itself
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20 const NODE_BYTES_LENGTH: usize = 20;
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21 type NodeData = [u8; NODE_BYTES_LENGTH];
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22
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23 /// Copy incoming Python bytes given as `PyObject` into `Node`,
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24 /// doing the necessary checks
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25 pub fn node_from_py_object<'a>(
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26 py: Python,
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27 bytes: &'a PyObject,
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28 ) -> PyResult<Node> {
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29 let as_py_bytes: &'a PyBytes = bytes.extract(py)?;
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30 node_from_py_bytes(py, as_py_bytes)
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31 }
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32
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33 /// Clone incoming Python bytes given as `PyBytes` as a `Node`,
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34 /// doing the necessary checks.
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35 pub fn node_from_py_bytes(py: Python, bytes: &PyBytes) -> PyResult<Node> {
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36 <NodeData>::try_from(bytes.data(py))
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37 .map_err(|_| {
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38 PyErr::new::<ValueError, _>(
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39 py,
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40 format!("{}-byte hash required", NODE_BYTES_LENGTH),
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41 )
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42 })
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43 .map(Into::into)
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44 }