Mercurial > hg
annotate mercurial/streamclone.py @ 11578:bb7af1de5e38
discovery: remove duplication for new remote head discovery
author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
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date | Thu, 15 Jul 2010 21:44:51 +0200 |
parents | 13a1b2fb7ef2 |
children | 67260651d09d |
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add support for streaming clone.
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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 |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
7640 | 8 import util, error |
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9 |
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10 from mercurial import store |
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11 |
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12 class StreamException(Exception): |
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13 def __init__(self, code): |
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14 Exception.__init__(self) |
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15 self.code = code |
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16 def __str__(self): |
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17 return '%i\n' % self.code |
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18 |
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19 # if server supports streaming clone, it advertises "stream" |
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20 # capability with value that is version+flags of repo it is serving. |
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21 # client only streams if it can read that repo format. |
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22 |
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23 # stream file format is simple. |
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24 # |
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25 # server writes out line that says how many files, how many total |
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26 # bytes. separator is ascii space, byte counts are strings. |
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27 # |
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28 # then for each file: |
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29 # |
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30 # server writes out line that says filename, how many bytes in |
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31 # file. separator is ascii nul, byte count is string. |
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32 # |
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33 # server writes out raw file data. |
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34 |
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35 def allowed(ui): |
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36 return ui.configbool('server', 'uncompressed', True, untrusted=True) |
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37 |
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38 def stream_out(repo): |
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39 '''stream out all metadata files in repository. |
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40 writes to file-like object, must support write() and optional flush().''' |
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41 |
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42 if not allowed(repo.ui): |
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43 raise StreamException(1) |
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44 |
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45 entries = [] |
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46 total_bytes = 0 |
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47 try: |
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48 # get consistent snapshot of repo, lock during scan |
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49 lock = repo.lock() |
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50 try: |
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51 repo.ui.debug('scanning\n') |
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52 for name, ename, size in repo.store.walk(): |
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53 entries.append((name, size)) |
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54 total_bytes += size |
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55 finally: |
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56 lock.release() |
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58 raise StreamException(2) |
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59 |
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60 yield '0\n' |
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61 repo.ui.debug('%d files, %d bytes to transfer\n' % |
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62 (len(entries), total_bytes)) |
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63 yield '%d %d\n' % (len(entries), total_bytes) |
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64 for name, size in entries: |
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65 repo.ui.debug('sending %s (%d bytes)\n' % (name, size)) |
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66 # partially encode name over the wire for backwards compat |
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67 yield '%s\0%d\n' % (store.encodedir(name), size) |
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68 for chunk in util.filechunkiter(repo.sopener(name), limit=size): |
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69 yield chunk |