mercurial/streamclone.py
author Martin Geisler <mg@daimi.au.dk>
Tue, 03 Feb 2009 20:32:42 +0100
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child 8109 496ae1ea4698
permissions -rw-r--r--
i18n: updated Danish translation Now with 379 translated and 1396 untranslated messages.
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# streamclone.py - streaming clone server support for mercurial
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#
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# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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import util, error
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from i18n import _
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class StreamException(Exception):
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    def __init__(self, code):
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        Exception.__init__(self)
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        self.code = code
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    def __str__(self):
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        return '%i\n' % self.code
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# if server supports streaming clone, it advertises "stream"
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# capability with value that is version+flags of repo it is serving.
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# client only streams if it can read that repo format.
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# stream file format is simple.
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#
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# server writes out line that says how many files, how many total
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# bytes.  separator is ascii space, byte counts are strings.
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#
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# then for each file:
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#
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#   server writes out line that says file name, how many bytes in
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#   file.  separator is ascii nul, byte count is string.
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#
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#   server writes out raw file data.
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def stream_out(repo, untrusted=False):
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    '''stream out all metadata files in repository.
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    writes to file-like object, must support write() and optional flush().'''
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    if not repo.ui.configbool('server', 'uncompressed', untrusted=untrusted):
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        raise StreamException(1)
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    entries = []
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    total_bytes = 0
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    try:
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        l = None
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        try:
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            repo.ui.debug(_('scanning\n'))
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            # get consistent snapshot of repo, lock during scan
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            l = repo.lock()
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            for name, ename, size in repo.store.walk():
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                entries.append((name, size))
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                total_bytes += size
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        finally:
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            del l
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    except error.LockError:
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        raise StreamException(2)
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    yield '0\n'
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    repo.ui.debug(_('%d files, %d bytes to transfer\n') %
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                  (len(entries), total_bytes))
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    yield '%d %d\n' % (len(entries), total_bytes)
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    for name, size in entries:
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        repo.ui.debug(_('sending %s (%d bytes)\n') % (name, size))
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        yield '%s\0%d\n' % (name, size)
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        for chunk in util.filechunkiter(repo.sopener(name), limit=size):
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            yield chunk