exchange: move code for consuming streaming clone into exchange

exchange: move code for consuming streaming clone into exchange

For reasons outlined in the previous commit, we want to make the code
for consuming "stream bundles" reusable. This patch extracts the code
into a standalone function.

--- a/mercurial/exchange.py	Thu May 21 10:27:22 2015 -0700
+++ b/mercurial/exchange.py	Thu May 21 10:27:45 2015 -0700
@@ -5,6 +5,7 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
+import time
 from i18n import _
 from node import hex, nullid
 import errno, urllib
@@ -1397,3 +1398,66 @@
                     yield chunk
     finally:
         sopener.mustaudit = oldaudit
+
+def consumestreamclone(repo, fp):
+    """Apply the contents from a streaming clone file.
+
+    This takes the output from "streamout" and applies it to the specified
+    repository.
+
+    Like "streamout," the status line added by the wire protocol is not handled
+    by this function.
+    """
+    lock = repo.lock()
+    try:
+        repo.ui.status(_('streaming all changes\n'))
+        l = fp.readline()
+        try:
+            total_files, total_bytes = map(int, l.split(' ', 1))
+        except (ValueError, TypeError):
+            raise error.ResponseError(
+                _('unexpected response from remote server:'), l)
+        repo.ui.status(_('%d files to transfer, %s of data\n') %
+                       (total_files, util.bytecount(total_bytes)))
+        handled_bytes = 0
+        repo.ui.progress(_('clone'), 0, total=total_bytes)
+        start = time.time()
+
+        tr = repo.transaction(_('clone'))
+        try:
+            for i in xrange(total_files):
+                # XXX doesn't support '\n' or '\r' in filenames
+                l = fp.readline()
+                try:
+                    name, size = l.split('\0', 1)
+                    size = int(size)
+                except (ValueError, TypeError):
+                    raise error.ResponseError(
+                        _('unexpected response from remote server:'), l)
+                if repo.ui.debugflag:
+                    repo.ui.debug('adding %s (%s)\n' %
+                                  (name, util.bytecount(size)))
+                # for backwards compat, name was partially encoded
+                ofp = repo.svfs(store.decodedir(name), 'w')
+                for chunk in util.filechunkiter(fp, limit=size):
+                    handled_bytes += len(chunk)
+                    repo.ui.progress(_('clone'), handled_bytes,
+                                     total=total_bytes)
+                    ofp.write(chunk)
+                ofp.close()
+            tr.close()
+        finally:
+            tr.release()
+
+        # Writing straight to files circumvented the inmemory caches
+        repo.invalidate()
+
+        elapsed = time.time() - start
+        if elapsed <= 0:
+            elapsed = 0.001
+        repo.ui.progress(_('clone'), None)
+        repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') %
+                       (util.bytecount(total_bytes), elapsed,
+                        util.bytecount(total_bytes / elapsed)))
+    finally:
+        lock.release()

--- a/mercurial/localrepo.py	Thu May 21 10:27:22 2015 -0700
+++ b/mercurial/localrepo.py	Thu May 21 10:27:45 2015 -0700
@@ -1776,55 +1776,8 @@
                 raise util.Abort(_('locking the remote repository failed'))
             elif resp != 0:
                 raise util.Abort(_('the server sent an unknown error code'))
-            self.ui.status(_('streaming all changes\n'))
-            l = fp.readline()
-            try:
-                total_files, total_bytes = map(int, l.split(' ', 1))
-            except (ValueError, TypeError):
-                raise error.ResponseError(
-                    _('unexpected response from remote server:'), l)
-            self.ui.status(_('%d files to transfer, %s of data\n') %
-                           (total_files, util.bytecount(total_bytes)))
-            handled_bytes = 0
-            self.ui.progress(_('clone'), 0, total=total_bytes)
-            start = time.time()
 
-            tr = self.transaction(_('clone'))
-            try:
-                for i in xrange(total_files):
-                    # XXX doesn't support '\n' or '\r' in filenames
-                    l = fp.readline()
-                    try:
-                        name, size = l.split('\0', 1)
-                        size = int(size)
-                    except (ValueError, TypeError):
-                        raise error.ResponseError(
-                            _('unexpected response from remote server:'), l)
-                    if self.ui.debugflag:
-                        self.ui.debug('adding %s (%s)\n' %
-                                      (name, util.bytecount(size)))
-                    # for backwards compat, name was partially encoded
-                    ofp = self.svfs(store.decodedir(name), 'w')
-                    for chunk in util.filechunkiter(fp, limit=size):
-                        handled_bytes += len(chunk)
-                        self.ui.progress(_('clone'), handled_bytes,
-                                         total=total_bytes)
-                        ofp.write(chunk)
-                    ofp.close()
-                tr.close()
-            finally:
-                tr.release()
-
-            # Writing straight to files circumvented the inmemory caches
-            self.invalidate()
-
-            elapsed = time.time() - start
-            if elapsed <= 0:
-                elapsed = 0.001
-            self.ui.progress(_('clone'), None)
-            self.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') %
-                           (util.bytecount(total_bytes), elapsed,
-                            util.bytecount(total_bytes / elapsed)))
+            exchange.consumestreamclone(self, fp)
 
             # new requirements = old non-format requirements +
             #                    new format-related remote requirements