--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/streamclone.py Fri Jul 14 11:17:22 2006 -0700
@@ -0,0 +1,82 @@
+# streamclone.py - streaming clone server support for mercurial
+#
+# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
+from demandload import demandload
+from i18n import gettext as _
+demandload(globals(), "os stat util")
+
+# if server supports streaming clone, it advertises "stream"
+# capability with value that is version+flags of repo it is serving.
+# client only streams if it can read that repo format.
+
+def walkrepo(root):
+ '''iterate over metadata files in repository.
+ walk in natural (sorted) order.
+ yields 2-tuples: name of .d or .i file, size of file.'''
+
+ strip_count = len(root) + len(os.sep)
+ def walk(path, recurse):
+ ents = os.listdir(path)
+ ents.sort()
+ for e in ents:
+ pe = os.path.join(path, e)
+ st = os.lstat(pe)
+ if stat.S_ISDIR(st.st_mode):
+ if recurse:
+ for x in walk(pe, True):
+ yield x
+ else:
+ if not stat.S_ISREG(st.st_mode) or len(e) < 2:
+ continue
+ sfx = e[-2:]
+ if sfx in ('.d', '.i'):
+ yield pe[strip_count:], st.st_size
+ # write file data first
+ for x in walk(os.path.join(root, 'data'), True):
+ yield x
+ # write manifest before changelog
+ meta = list(walk(root, False))
+ meta.sort(reverse=True)
+ for x in meta:
+ yield x
+
+# stream file format is simple.
+#
+# server writes out line that says how many files, how many total
+# bytes. separator is ascii space, byte counts are strings.
+#
+# then for each file:
+#
+# server writes out line that says file name, how many bytes in
+# file. separator is ascii nul, byte count is string.
+#
+# server writes out raw file data.
+
+def stream_out(repo, fileobj):
+ '''stream out all metadata files in repository.
+ writes to file-like object, must support write() and optional flush().'''
+ # get consistent snapshot of repo. lock during scan so lock not
+ # needed while we stream, and commits can happen.
+ lock = repo.lock()
+ repo.ui.debug('scanning\n')
+ entries = []
+ total_bytes = 0
+ for name, size in walkrepo(repo.path):
+ entries.append((name, size))
+ total_bytes += size
+ lock.release()
+
+ repo.ui.debug('%d files, %d bytes to transfer\n' %
+ (len(entries), total_bytes))
+ fileobj.write('%d %d\n' % (len(entries), total_bytes))
+ for name, size in entries:
+ repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
+ fileobj.write('%s\0%d\n' % (name, size))
+ for chunk in util.filechunkiter(repo.opener(name), limit=size):
+ fileobj.write(chunk)
+ flush = getattr(fileobj, 'flush', None)
+ if flush: flush()