annotate rust/hg-cpython/src/dirstate/dirstate_map.rs @ 47511:eaae39894312

dirstate: move most of the `remove` logic with dirstatemap `removefile`

This code deal with special logic to preserving "merged" and "from_p2" information when removing a file. These are implementation details that are more suitable for the dirstatemap layer. Since the dirstatemap layer alreaday have most of the information necessary to do so, the move is easy.

This move helps us to encapsulate more implementation details within the dirstatemap and its entry. Easing the use of a different storage for dirstate v2.

Differential Revision: https://phab.mercurial-scm.org/D10953

// dirstate_map.rs
//
// Copyright 2019 Raphaël Gomès <[e-mail]>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.

//! Bindings for the `hg::dirstate::dirstate_map` file provided by the
//! `hg-core` package.

use std::cell::{RefCell, RefMut};
use std::convert::TryInto;

use cpython::{
    exc, ObjectProtocol, PyBool, PyBytes, PyClone, PyDict, PyErr, PyList,
    PyObject, PyResult, PySet, PyString, Python, PythonObject, ToPyObject,
    UnsafePyLeaked,
};

use crate::{
    dirstate::copymap::{CopyMap, CopyMapItemsIterator, CopyMapKeysIterator},
    dirstate::make_dirstate_tuple,
    dirstate::non_normal_entries::{
        NonNormalEntries, NonNormalEntriesIterator,
    },
    dirstate::owning::OwningDirstateMap,
    parsers::dirstate_parents_to_pytuple,
};
use hg::{
    dirstate::parsers::Timestamp,
    dirstate_tree::dispatch::DirstateMapMethods,
    dirstate_tree::on_disk::DirstateV2ParseError,
    errors::HgError,
    revlog::Node,
    utils::files::normalize_case,
    utils::hg_path::{HgPath, HgPathBuf},
    DirstateEntry, DirstateError, DirstateMap as RustDirstateMap,
    DirstateParents, EntryState, StateMapIter,
};

// TODO
//     This object needs to share references to multiple members of its Rust
//     inner struct, namely `copy_map`, `dirs` and `all_dirs`.
//     Right now `CopyMap` is done, but it needs to have an explicit reference
//     to `RustDirstateMap` which itself needs to have an encapsulation for
//     every method in `CopyMap` (copymapcopy, etc.).
//     This is ugly and hard to maintain.
//     The same logic applies to `dirs` and `all_dirs`, however the `Dirs`
//     `py_class!` is already implemented and does not mention
//     `RustDirstateMap`, rightfully so.
//     All attributes also have to have a separate refcount data attribute for
//     leaks, with all methods that go along for reference sharing.
py_class!(pub class DirstateMap |py| {
    @shared data inner: Box<dyn DirstateMapMethods + Send>;

    /// Returns a `(dirstate_map, parents)` tuple
    @staticmethod
    def new(
        use_dirstate_tree: bool,
        use_dirstate_v2: bool,
        on_disk: PyBytes,
    ) -> PyResult<PyObject> {
        let dirstate_error = |e: DirstateError| {
            PyErr::new::<exc::OSError, _>(py, format!("Dirstate error: {:?}", e))
        };
        let (inner, parents) = if use_dirstate_tree || use_dirstate_v2 {
            let (map, parents) =
                OwningDirstateMap::new(py, on_disk, use_dirstate_v2)
                .map_err(dirstate_error)?;
            (Box::new(map) as _, parents)
        } else {
            let bytes = on_disk.data(py);
            let mut map = RustDirstateMap::default();
            let parents = map.read(bytes).map_err(dirstate_error)?;
            (Box::new(map) as _, parents)
        };
        let map = Self::create_instance(py, inner)?;
        let parents = parents.map(|p| dirstate_parents_to_pytuple(py, &p));
        Ok((map, parents).to_py_object(py).into_object())
    }

    def clear(&self) -> PyResult<PyObject> {
        self.inner(py).borrow_mut().clear();
        Ok(py.None())
    }

    def get(
        &self,
        key: PyObject,
        default: Option<PyObject> = None
    ) -> PyResult<Option<PyObject>> {
        let key = key.extract::<PyBytes>(py)?;
        match self
            .inner(py)
            .borrow()
            .get(HgPath::new(key.data(py)))
            .map_err(|e| v2_error(py, e))?
        {
            Some(entry) => {
                Ok(Some(make_dirstate_tuple(py, &entry)?))
            },
            None => Ok(default)
        }
    }

    def addfile(
        &self,
        f: PyObject,
        oldstate: PyObject,
        state: PyObject,
        mode: PyObject,
        size: PyObject,
        mtime: PyObject
    ) -> PyResult<PyObject> {
        self.inner(py).borrow_mut().add_file(
            HgPath::new(f.extract::<PyBytes>(py)?.data(py)),
            oldstate.extract::<PyBytes>(py)?.data(py)[0]
                .try_into()
                .map_err(|e: HgError| {
                    PyErr::new::<exc::ValueError, _>(py, e.to_string())
                })?,
            DirstateEntry {
                state: state.extract::<PyBytes>(py)?.data(py)[0]
                    .try_into()
                    .map_err(|e: HgError| {
                        PyErr::new::<exc::ValueError, _>(py, e.to_string())
                    })?,
                mode: mode.extract(py)?,
                size: size.extract(py)?,
                mtime: mtime.extract(py)?,
            },
        ).and(Ok(py.None())).or_else(|e: DirstateError| {
            Err(PyErr::new::<exc::ValueError, _>(py, e.to_string()))
        })
    }

    def removefile(
        &self,
        f: PyObject,
        in_merge: PyObject
    ) -> PyResult<PyObject> {
        self.inner(py).borrow_mut()
            .remove_file(
                HgPath::new(f.extract::<PyBytes>(py)?.data(py)),
                in_merge.extract::<PyBool>(py)?.is_true(),
            )
            .or_else(|_| {
                Err(PyErr::new::<exc::OSError, _>(
                    py,
                    "Dirstate error".to_string(),
                ))
            })?;
        Ok(py.None())
    }

    def dropfile(
        &self,
        f: PyObject,
        oldstate: PyObject
    ) -> PyResult<PyBool> {
        self.inner(py).borrow_mut()
            .drop_file(
                HgPath::new(f.extract::<PyBytes>(py)?.data(py)),
                oldstate.extract::<PyBytes>(py)?.data(py)[0]
                    .try_into()
                    .map_err(|e: HgError| {
                        PyErr::new::<exc::ValueError, _>(py, e.to_string())
                    })?,
            )
            .and_then(|b| Ok(b.to_py_object(py)))
            .or_else(|e| {
                Err(PyErr::new::<exc::OSError, _>(
                    py,
                    format!("Dirstate error: {}", e.to_string()),
                ))
            })
    }

    def clearambiguoustimes(
        &self,
        files: PyObject,
        now: PyObject
    ) -> PyResult<PyObject> {
        let files: PyResult<Vec<HgPathBuf>> = files
            .iter(py)?
            .map(|filename| {
                Ok(HgPathBuf::from_bytes(
                    filename?.extract::<PyBytes>(py)?.data(py),
                ))
            })
            .collect();
        self.inner(py)
            .borrow_mut()
            .clear_ambiguous_times(files?, now.extract(py)?)
            .map_err(|e| v2_error(py, e))?;
        Ok(py.None())
    }

    def other_parent_entries(&self) -> PyResult<PyObject> {
        let mut inner_shared = self.inner(py).borrow_mut();
        let set = PySet::empty(py)?;
        for path in inner_shared.iter_other_parent_paths() {
            let path = path.map_err(|e| v2_error(py, e))?;
            set.add(py, PyBytes::new(py, path.as_bytes()))?;
        }
        Ok(set.into_object())
    }

    def non_normal_entries(&self) -> PyResult<NonNormalEntries> {
        NonNormalEntries::from_inner(py, self.clone_ref(py))
    }

    def non_normal_entries_contains(&self, key: PyObject) -> PyResult<bool> {
        let key = key.extract::<PyBytes>(py)?;
        self.inner(py)
            .borrow_mut()
            .non_normal_entries_contains(HgPath::new(key.data(py)))
            .map_err(|e| v2_error(py, e))
    }

    def non_normal_entries_display(&self) -> PyResult<PyString> {
        let mut inner = self.inner(py).borrow_mut();
        let paths = inner
            .iter_non_normal_paths()
            .collect::<Result<Vec<_>, _>>()
            .map_err(|e| v2_error(py, e))?;
        let formatted = format!("NonNormalEntries: {}", hg::utils::join_display(paths, ", "));
        Ok(PyString::new(py, &formatted))
    }

    def non_normal_entries_remove(&self, key: PyObject) -> PyResult<PyObject> {
        let key = key.extract::<PyBytes>(py)?;
        self
            .inner(py)
            .borrow_mut()
            .non_normal_entries_remove(HgPath::new(key.data(py)));
        Ok(py.None())
    }

    def non_normal_or_other_parent_paths(&self) -> PyResult<PyList> {
        let mut inner = self.inner(py).borrow_mut();

        let ret = PyList::new(py, &[]);
        for filename in inner.non_normal_or_other_parent_paths() {
            let filename = filename.map_err(|e| v2_error(py, e))?;
            let as_pystring = PyBytes::new(py, filename.as_bytes());
            ret.append(py, as_pystring.into_object());
        }
        Ok(ret)
    }

    def non_normal_entries_iter(&self) -> PyResult<NonNormalEntriesIterator> {
        // Make sure the sets are defined before we no longer have a mutable
        // reference to the dmap.
        self.inner(py)
            .borrow_mut()
            .set_non_normal_other_parent_entries(false);

        let leaked_ref = self.inner(py).leak_immutable();

        NonNormalEntriesIterator::from_inner(py, unsafe {
            leaked_ref.map(py, |o| {
                o.iter_non_normal_paths_panic()
            })
        })
    }

    def hastrackeddir(&self, d: PyObject) -> PyResult<PyBool> {
        let d = d.extract::<PyBytes>(py)?;
        Ok(self.inner(py).borrow_mut()
            .has_tracked_dir(HgPath::new(d.data(py)))
            .map_err(|e| {
                PyErr::new::<exc::ValueError, _>(py, e.to_string())
            })?
            .to_py_object(py))
    }

    def hasdir(&self, d: PyObject) -> PyResult<PyBool> {
        let d = d.extract::<PyBytes>(py)?;
        Ok(self.inner(py).borrow_mut()
            .has_dir(HgPath::new(d.data(py)))
            .map_err(|e| {
                PyErr::new::<exc::ValueError, _>(py, e.to_string())
            })?
            .to_py_object(py))
    }

    def write(
        &self,
        use_dirstate_v2: bool,
        p1: PyObject,
        p2: PyObject,
        now: PyObject
    ) -> PyResult<PyBytes> {
        let now = Timestamp(now.extract(py)?);
        let parents = DirstateParents {
            p1: extract_node_id(py, &p1)?,
            p2: extract_node_id(py, &p2)?,
        };

        let mut inner = self.inner(py).borrow_mut();
        let result = if use_dirstate_v2 {
            inner.pack_v2(parents, now)
        } else {
            inner.pack_v1(parents, now)
        };
        match result {
            Ok(packed) => Ok(PyBytes::new(py, &packed)),
            Err(_) => Err(PyErr::new::<exc::OSError, _>(
                py,
                "Dirstate error".to_string(),
            )),
        }
    }

    def filefoldmapasdict(&self) -> PyResult<PyDict> {
        let dict = PyDict::new(py);
        for item in self.inner(py).borrow_mut().iter() {
            let (path, entry) = item.map_err(|e| v2_error(py, e))?;
            if entry.state != EntryState::Removed {
                let key = normalize_case(path);
                let value = path;
                dict.set_item(
                    py,
                    PyBytes::new(py, key.as_bytes()).into_object(),
                    PyBytes::new(py, value.as_bytes()).into_object(),
                )?;
            }
        }
        Ok(dict)
    }

    def __len__(&self) -> PyResult<usize> {
        Ok(self.inner(py).borrow().len())
    }

    def __contains__(&self, key: PyObject) -> PyResult<bool> {
        let key = key.extract::<PyBytes>(py)?;
        self.inner(py)
            .borrow()
            .contains_key(HgPath::new(key.data(py)))
            .map_err(|e| v2_error(py, e))
    }

    def __getitem__(&self, key: PyObject) -> PyResult<PyObject> {
        let key = key.extract::<PyBytes>(py)?;
        let key = HgPath::new(key.data(py));
        match self
            .inner(py)
            .borrow()
            .get(key)
            .map_err(|e| v2_error(py, e))?
        {
            Some(entry) => {
                Ok(make_dirstate_tuple(py, &entry)?)
            },
            None => Err(PyErr::new::<exc::KeyError, _>(
                py,
                String::from_utf8_lossy(key.as_bytes()),
            )),
        }
    }

    def keys(&self) -> PyResult<DirstateMapKeysIterator> {
        let leaked_ref = self.inner(py).leak_immutable();
        DirstateMapKeysIterator::from_inner(
            py,
            unsafe { leaked_ref.map(py, |o| o.iter()) },
        )
    }

    def items(&self) -> PyResult<DirstateMapItemsIterator> {
        let leaked_ref = self.inner(py).leak_immutable();
        DirstateMapItemsIterator::from_inner(
            py,
            unsafe { leaked_ref.map(py, |o| o.iter()) },
        )
    }

    def __iter__(&self) -> PyResult<DirstateMapKeysIterator> {
        let leaked_ref = self.inner(py).leak_immutable();
        DirstateMapKeysIterator::from_inner(
            py,
            unsafe { leaked_ref.map(py, |o| o.iter()) },
        )
    }

    // TODO all copymap* methods, see docstring above
    def copymapcopy(&self) -> PyResult<PyDict> {
        let dict = PyDict::new(py);
        for item in self.inner(py).borrow().copy_map_iter() {
            let (key, value) = item.map_err(|e| v2_error(py, e))?;
            dict.set_item(
                py,
                PyBytes::new(py, key.as_bytes()),
                PyBytes::new(py, value.as_bytes()),
            )?;
        }
        Ok(dict)
    }

    def copymapgetitem(&self, key: PyObject) -> PyResult<PyBytes> {
        let key = key.extract::<PyBytes>(py)?;
        match self
            .inner(py)
            .borrow()
            .copy_map_get(HgPath::new(key.data(py)))
            .map_err(|e| v2_error(py, e))?
        {
            Some(copy) => Ok(PyBytes::new(py, copy.as_bytes())),
            None => Err(PyErr::new::<exc::KeyError, _>(
                py,
                String::from_utf8_lossy(key.data(py)),
            )),
        }
    }
    def copymap(&self) -> PyResult<CopyMap> {
        CopyMap::from_inner(py, self.clone_ref(py))
    }

    def copymaplen(&self) -> PyResult<usize> {
        Ok(self.inner(py).borrow().copy_map_len())
    }
    def copymapcontains(&self, key: PyObject) -> PyResult<bool> {
        let key = key.extract::<PyBytes>(py)?;
        self.inner(py)
            .borrow()
            .copy_map_contains_key(HgPath::new(key.data(py)))
            .map_err(|e| v2_error(py, e))
    }
    def copymapget(
        &self,
        key: PyObject,
        default: Option<PyObject>
    ) -> PyResult<Option<PyObject>> {
        let key = key.extract::<PyBytes>(py)?;
        match self
            .inner(py)
            .borrow()
            .copy_map_get(HgPath::new(key.data(py)))
            .map_err(|e| v2_error(py, e))?
        {
            Some(copy) => Ok(Some(
                PyBytes::new(py, copy.as_bytes()).into_object(),
            )),
            None => Ok(default),
        }
    }
    def copymapsetitem(
        &self,
        key: PyObject,
        value: PyObject
    ) -> PyResult<PyObject> {
        let key = key.extract::<PyBytes>(py)?;
        let value = value.extract::<PyBytes>(py)?;
        self.inner(py)
            .borrow_mut()
            .copy_map_insert(
                HgPathBuf::from_bytes(key.data(py)),
                HgPathBuf::from_bytes(value.data(py)),
            )
            .map_err(|e| v2_error(py, e))?;
        Ok(py.None())
    }
    def copymappop(
        &self,
        key: PyObject,
        default: Option<PyObject>
    ) -> PyResult<Option<PyObject>> {
        let key = key.extract::<PyBytes>(py)?;
        match self
            .inner(py)
            .borrow_mut()
            .copy_map_remove(HgPath::new(key.data(py)))
            .map_err(|e| v2_error(py, e))?
        {
            Some(_) => Ok(None),
            None => Ok(default),
        }
    }

    def copymapiter(&self) -> PyResult<CopyMapKeysIterator> {
        let leaked_ref = self.inner(py).leak_immutable();
        CopyMapKeysIterator::from_inner(
            py,
            unsafe { leaked_ref.map(py, |o| o.copy_map_iter()) },
        )
    }

    def copymapitemsiter(&self) -> PyResult<CopyMapItemsIterator> {
        let leaked_ref = self.inner(py).leak_immutable();
        CopyMapItemsIterator::from_inner(
            py,
            unsafe { leaked_ref.map(py, |o| o.copy_map_iter()) },
        )
    }

    def directories(&self) -> PyResult<PyList> {
        let dirs = PyList::new(py, &[]);
        for item in self.inner(py).borrow().iter_directories() {
            let (path, mtime) = item.map_err(|e| v2_error(py, e))?;
            let path = PyBytes::new(py, path.as_bytes());
            let mtime = mtime.map(|t| t.0).unwrap_or(-1);
            let tuple = (path, (b'd', 0, 0, mtime));
            dirs.append(py, tuple.to_py_object(py).into_object())
        }
        Ok(dirs)
    }

});

impl DirstateMap {
    pub fn get_inner_mut<'a>(
        &'a self,
        py: Python<'a>,
    ) -> RefMut<'a, Box<dyn DirstateMapMethods + Send>> {
        self.inner(py).borrow_mut()
    }
    fn translate_key(
        py: Python,
        res: Result<(&HgPath, DirstateEntry), DirstateV2ParseError>,
    ) -> PyResult<Option<PyBytes>> {
        let (f, _entry) = res.map_err(|e| v2_error(py, e))?;
        Ok(Some(PyBytes::new(py, f.as_bytes())))
    }
    fn translate_key_value(
        py: Python,
        res: Result<(&HgPath, DirstateEntry), DirstateV2ParseError>,
    ) -> PyResult<Option<(PyBytes, PyObject)>> {
        let (f, entry) = res.map_err(|e| v2_error(py, e))?;
        Ok(Some((
            PyBytes::new(py, f.as_bytes()),
            make_dirstate_tuple(py, &entry)?,
        )))
    }
}

py_shared_iterator!(
    DirstateMapKeysIterator,
    UnsafePyLeaked<StateMapIter<'static>>,
    DirstateMap::translate_key,
    Option<PyBytes>
);

py_shared_iterator!(
    DirstateMapItemsIterator,
    UnsafePyLeaked<StateMapIter<'static>>,
    DirstateMap::translate_key_value,
    Option<(PyBytes, PyObject)>
);

fn extract_node_id(py: Python, obj: &PyObject) -> PyResult<Node> {
    let bytes = obj.extract::<PyBytes>(py)?;
    match bytes.data(py).try_into() {
        Ok(s) => Ok(s),
        Err(e) => Err(PyErr::new::<exc::ValueError, _>(py, e.to_string())),
    }
}

pub(super) fn v2_error(py: Python<'_>, _: DirstateV2ParseError) -> PyErr {
    PyErr::new::<exc::ValueError, _>(py, "corrupted dirstate-v2")
}