author | Matt Mackall <mpm@selenic.com> |
Sun, 17 Sep 2006 16:13:34 -0500 | |
changeset 3107 | 4ec28446fca8 |
parent 2623 | d1cbfe9e13cd |
child 3687 | d5dd0a2a44bc |
permissions | -rw-r--r-- |
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add support for streaming clone.
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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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|
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from demandload import demandload |
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from i18n import gettext as _ |
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demandload(globals(), "os stat util") |
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|
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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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|
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def walkrepo(root): |
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'''iterate over metadata files in repository. |
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walk in natural (sorted) order. |
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yields 2-tuples: name of .d or .i file, size of file.''' |
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|
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strip_count = len(root) + len(os.sep) |
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def walk(path, recurse): |
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ents = os.listdir(path) |
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ents.sort() |
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for e in ents: |
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pe = os.path.join(path, e) |
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st = os.lstat(pe) |
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if stat.S_ISDIR(st.st_mode): |
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if recurse: |
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for x in walk(pe, True): |
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yield x |
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else: |
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if not stat.S_ISREG(st.st_mode) or len(e) < 2: |
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continue |
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sfx = e[-2:] |
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if sfx in ('.d', '.i'): |
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yield pe[strip_count:], st.st_size |
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# write file data first |
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for x in walk(os.path.join(root, 'data'), True): |
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yield x |
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# write manifest before changelog |
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meta = list(walk(root, False)) |
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meta.sort() |
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meta.reverse() |
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for x in meta: |
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yield x |
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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, fileobj): |
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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'): |
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fileobj.write('1\n') |
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return |
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fileobj.write('0\n') |
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# get consistent snapshot of repo. lock during scan so lock not |
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# needed while we stream, and commits can happen. |
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lock = repo.lock() |
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repo.ui.debug('scanning\n') |
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entries = [] |
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total_bytes = 0 |
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for name, size in walkrepo(repo.path): |
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entries.append((name, size)) |
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total_bytes += size |
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lock.release() |
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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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fileobj.write('%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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fileobj.write('%s\0%d\n' % (name, size)) |
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for chunk in util.filechunkiter(repo.opener(name), limit=size): |
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fileobj.write(chunk) |
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flush = getattr(fileobj, 'flush', None) |
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if flush: flush() |