hgext/largefiles/remotestore.py

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext/largefiles/remotestore.py	Sat Sep 24 17:35:45 2011 +0200
@@ -0,0 +1,106 @@
+# Copyright 2010-2011 Fog Creek Software
+# Copyright 2010-2011 Unity Technologies
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+'''Remote largefile store; the base class for servestore'''
+
+import urllib2
+import HTTPError
+
+from mercurial import util
+from mercurial.i18n import _
+
+import lfutil
+import basestore
+
+class remotestore(basestore.basestore):
+    """A largefile store accessed over a network"""
+    def __init__(self, ui, repo, url):
+        super(remotestore, self).__init__(ui, repo, url)
+
+    def put(self, source, hash):
+        if self._verify(hash):
+            return
+        if self.sendfile(source, hash):
+            raise util.Abort(
+                _('remotestore: could not put %s to remote store %s')
+                % (source, self.url))
+        self.ui.debug(
+            _('remotestore: put %s to remote store %s') % (source, self.url))
+
+    def exists(self, hash):
+        return self._verify(hash)
+
+    def sendfile(self, filename, hash):
+        self.ui.debug('remotestore: sendfile(%s, %s)\n' % (filename, hash))
+        fd = None
+        try:
+            try:
+                fd = lfutil.httpsendfile(self.ui, filename)
+            except IOError, e:
+                raise util.Abort(
+                    _('remotestore: could not open file %s: %s')
+                    % (filename, str(e)))
+            return self._put(hash, fd)
+        finally:
+            if fd:
+                fd.close()
+
+    def _getfile(self, tmpfile, filename, hash):
+        # quit if the largefile isn't there
+        stat = self._stat(hash)
+        if stat:
+            raise util.Abort(_('remotestore: largefile %s is %s') %
+                             (hash, stat == 1 and 'invalid' or 'missing'))
+
+        try:
+            length, infile = self._get(hash)
+        except HTTPError, e:
+            # 401s get converted to util.Aborts; everything else is fine being
+            # turned into a StoreError
+            raise basestore.StoreError(filename, hash, self.url, str(e))
+        except urllib2.URLError, e:
+            # This usually indicates a connection problem, so don't
+            # keep trying with the other files... they will probably
+            # all fail too.
+            raise util.Abort('%s: %s' % (self.url, str(e.reason)))
+        except IOError, e:
+            raise basestore.StoreError(filename, hash, self.url, str(e))
+
+        # Mercurial does not close its SSH connections after writing a stream
+        if length is not None:
+            infile = lfutil.limitreader(infile, length)
+        return lfutil.copyandhash(lfutil.blockstream(infile), tmpfile)
+
+    def _verify(self, hash):
+        return not self._stat(hash)
+
+    def _verifyfile(self, cctx, cset, contents, standin, verified):
+        filename = lfutil.splitstandin(standin)
+        if not filename:
+            return False
+        fctx = cctx[standin]
+        key = (filename, fctx.filenode())
+        if key in verified:
+            return False
+
+        verified.add(key)
+
+        stat = self._stat(hash)
+        if not stat:
+            return False
+        elif stat == 1:
+            self.ui.warn(
+                _('changeset %s: %s: contents differ\n')
+                % (cset, filename))
+            return True # failed
+        elif stat == 2:
+            self.ui.warn(
+                _('changeset %s: %s missing\n')
+                % (cset, filename))
+            return True # failed
+        else:
+            raise util.Abort(_('check failed, unexpected response'
+                               'statlfile: %d') % stat)