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annotate mercurial/streamclone.py @ 11624:67260651d09d

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protocol: convert StreamException to generated error code This makes it much easier to handle these errors at the transport level.
author Dirkjan Ochtman <dirkjan@ochtman.nl>
date Fri, 16 Jul 2010 22:20:19 +0200
parents 13a1b2fb7ef2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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Vadim Gelfer <vadim.gelfer@gmail.com>
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1 # streamclone.py - streaming clone server support for mercurial
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2 #
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3 # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 import util, error
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9 from mercurial import store
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10
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11 # if server supports streaming clone, it advertises "stream"
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12 # capability with value that is version+flags of repo it is serving.
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13 # client only streams if it can read that repo format.
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14
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15 # stream file format is simple.
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16 #
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17 # server writes out line that says how many files, how many total
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18 # bytes. separator is ascii space, byte counts are strings.
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19 #
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20 # then for each file:
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21 #
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timeless <timeless@gmail.com>
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22 # server writes out line that says filename, how many bytes in
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23 # file. separator is ascii nul, byte count is string.
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24 #
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25 # server writes out raw file data.
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26
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27 def allowed(ui):
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28 return ui.configbool('server', 'uncompressed', True, untrusted=True)
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29
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30 def stream_out(repo):
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31 '''stream out all metadata files in repository.
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32 writes to file-like object, must support write() and optional flush().'''
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33
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34 if not allowed(repo.ui):
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35 yield '1\n' # error: 1
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36 return
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37
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38 entries = []
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39 total_bytes = 0
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40 try:
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41 # get consistent snapshot of repo, lock during scan
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42 lock = repo.lock()
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43 try:
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44 repo.ui.debug('scanning\n')
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45 for name, ename, size in repo.store.walk():
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46 entries.append((name, size))
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47 total_bytes += size
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48 finally:
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49 lock.release()
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50 except error.LockError:
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51 yield '2\n' # error: 2
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52 return
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53
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54 yield '0\n' # success
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55 repo.ui.debug('%d files, %d bytes to transfer\n' %
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56 (len(entries), total_bytes))
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57 yield '%d %d\n' % (len(entries), total_bytes)
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58 for name, size in entries:
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59 repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
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60 # partially encode name over the wire for backwards compat
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61 yield '%s\0%d\n' % (store.encodedir(name), size)
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62 for chunk in util.filechunkiter(repo.sopener(name), limit=size):
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63 yield chunk