view hgext/infinitepush/common.py @ 42001:624d6683c705

branchmap: remove the dict interface from the branchcache class (API)

The current branchmap computation involves reading the whole branchmap from
disk, validating all the nodes even if they are not required. This leads to a
lot of time on repos which have large branchmap or a lot of branches. On large
repos, this can validate around 1000's of nodes.

On some operations, like finding whether a branch exists or not, we don't need
to validate all the nodes. Or updating heads for a single branch.

Before this patch, branchcache class was having dict interface and it was hard
to keep track of reads.

This patch removes the dict interface. Upcoming patches will implement lazy
loading and validation of data and implement better API's.

Differential Revision: https://phab.mercurial-scm.org/D6151

# Copyright 2017 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import os

from mercurial.node import hex

from mercurial import (
    error,
    extensions,
    pycompat,
)

def isremotebooksenabled(ui):
    return ('remotenames' in extensions._extensions and
            ui.configbool('remotenames', 'bookmarks'))

def downloadbundle(repo, unknownbinhead):
    index = repo.bundlestore.index
    store = repo.bundlestore.store
    bundleid = index.getbundle(hex(unknownbinhead))
    if bundleid is None:
        raise error.Abort('%s head is not known' % hex(unknownbinhead))
    bundleraw = store.read(bundleid)
    return _makebundlefromraw(bundleraw)

def _makebundlefromraw(data):
    fp = None
    fd, bundlefile = pycompat.mkstemp()
    try:  # guards bundlefile
        try:  # guards fp
            fp = os.fdopen(fd, r'wb')
            fp.write(data)
        finally:
            fp.close()
    except Exception:
        try:
            os.unlink(bundlefile)
        except Exception:
            # we would rather see the original exception
            pass
        raise

    return bundlefile