mercurial/streamclone.py
author Matt Mackall <mpm@selenic.com>
Wed, 13 Dec 2006 13:27:09 -0600
changeset 3877 abaee83ce0a6
parent 3856 f9e129684b5d
child 3891 6b4127c7d52a
permissions -rw-r--r--
Replace demandload with new demandimport
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
2612
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
     1
# streamclone.py - streaming clone server support for mercurial
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
     2
#
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
     3
# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
     4
#
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
     5
# This software may be used and distributed according to the terms
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
     6
# of the GNU General Public License, incorporated herein by reference.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
     7
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
     8
from i18n import gettext as _
3877
abaee83ce0a6 Replace demandload with new demandimport
Matt Mackall <mpm@selenic.com>
parents: 3856
diff changeset
     9
import os, stat, util, lock
2612
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    10
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    11
# if server supports streaming clone, it advertises "stream"
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    12
# capability with value that is version+flags of repo it is serving.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    13
# client only streams if it can read that repo format.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    14
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    15
def walkrepo(root):
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    16
    '''iterate over metadata files in repository.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    17
    walk in natural (sorted) order.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    18
    yields 2-tuples: name of .d or .i file, size of file.'''
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    19
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    20
    strip_count = len(root) + len(os.sep)
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    21
    def walk(path, recurse):
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    22
        ents = os.listdir(path)
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    23
        ents.sort()
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    24
        for e in ents:
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    25
            pe = os.path.join(path, e)
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    26
            st = os.lstat(pe)
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    27
            if stat.S_ISDIR(st.st_mode):
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    28
                if recurse:
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    29
                    for x in walk(pe, True):
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    30
                        yield x
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    31
            else:
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    32
                if not stat.S_ISREG(st.st_mode) or len(e) < 2:
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    33
                    continue
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    34
                sfx = e[-2:]
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    35
                if sfx in ('.d', '.i'):
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    36
                    yield pe[strip_count:], st.st_size
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    37
    # write file data first
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    38
    for x in walk(os.path.join(root, 'data'), True):
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    39
        yield x
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    40
    # write manifest before changelog
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    41
    meta = list(walk(root, False))
2623
d1cbfe9e13cd fix problem with uncompressed clone and python 2.3.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 2622
diff changeset
    42
    meta.sort()
d1cbfe9e13cd fix problem with uncompressed clone and python 2.3.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 2622
diff changeset
    43
    meta.reverse()
2612
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    44
    for x in meta:
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    45
        yield x
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    46
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    47
# stream file format is simple.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    48
#
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    49
# server writes out line that says how many files, how many total
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    50
# bytes.  separator is ascii space, byte counts are strings.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    51
#
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    52
# then for each file:
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    53
#
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    54
#   server writes out line that says file name, how many bytes in
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    55
#   file.  separator is ascii nul, byte count is string.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    56
#
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    57
#   server writes out raw file data.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    58
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    59
def stream_out(repo, fileobj):
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    60
    '''stream out all metadata files in repository.
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    61
    writes to file-like object, must support write() and optional flush().'''
2621
5a5852a417b1 clone: disable stream support on server side by default.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 2612
diff changeset
    62
2622
064aef9162cc rename stream hgrc option to compressed.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 2621
diff changeset
    63
    if not repo.ui.configbool('server', 'uncompressed'):
2621
5a5852a417b1 clone: disable stream support on server side by default.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 2612
diff changeset
    64
        fileobj.write('1\n')
5a5852a417b1 clone: disable stream support on server side by default.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 2612
diff changeset
    65
        return
5a5852a417b1 clone: disable stream support on server side by default.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 2612
diff changeset
    66
2612
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    67
    # get consistent snapshot of repo. lock during scan so lock not
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    68
    # needed while we stream, and commits can happen.
3687
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    69
    try:
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    70
        repolock = repo.lock()
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    71
    except (lock.LockHeld, lock.LockUnavailable), inst:
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    72
        repo.ui.warn('locking the repository failed: %s\n' % (inst,))
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    73
        fileobj.write('2\n')
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    74
        return
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    75
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    76
    fileobj.write('0\n')
2612
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    77
    repo.ui.debug('scanning\n')
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    78
    entries = []
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    79
    total_bytes = 0
3791
8643b9f90b51 introduce localrepo.spath for the store path, sopener fixes
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 3721
diff changeset
    80
    for name, size in walkrepo(repo.spath):
3856
f9e129684b5d streamclone: remove unnecessary test, pconvert names
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 3853
diff changeset
    81
        name = util.pconvert(repo.decodefn(name))
2612
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    82
        entries.append((name, size))
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    83
        total_bytes += size
3687
d5dd0a2a44bc Handle locking exceptions if streaming clone can't lock the repo. (Issue324)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2623
diff changeset
    84
    repolock.release()
2612
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    85
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    86
    repo.ui.debug('%d files, %d bytes to transfer\n' %
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    87
                  (len(entries), total_bytes))
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    88
    fileobj.write('%d %d\n' % (len(entries), total_bytes))
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    89
    for name, size in entries:
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    90
        repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    91
        fileobj.write('%s\0%d\n' % (name, size))
3791
8643b9f90b51 introduce localrepo.spath for the store path, sopener fixes
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 3721
diff changeset
    92
        for chunk in util.filechunkiter(repo.sopener(name), limit=size):
2612
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    93
            fileobj.write(chunk)
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    94
    flush = getattr(fileobj, 'flush', None)
ffb895f16925 add support for streaming clone.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
    95
    if flush: flush()