httpsendfile: record progress information during read()

This allows us to provide deterministic progress information during
transfer of bundle data over HTTP. This is required because we
currently buffer the bundle data to local disk prior to transfer since
wsgiref lacks chunked transfer-coding support.

mercurial/httprepo.py

@@ -160,7 +160,7 b' class httprepository(wireproto.wirerepos'
                     break
 
         tempname = changegroup.writebundle(cg, None, type)
-        fp = url.httpsendfile(tempname, "rb")
+        fp = url.httpsendfile(self.ui, tempname, "rb")
         headers = {'Content-Type': 'application/mercurial-0.1'}
 
         try:

mercurial/url.py

@@ -258,18 +258,36 b' class httpsendfile(object):'
     defines a __len__ attribute to feed the Content-Length header.
     """
 
-    def __init__(self, *args, **kwargs):
+    def __init__(self, ui, *args, **kwargs):
         # We can't just "self._data = open(*args, **kwargs)" here because there
         # is an "open" function defined in this module that shadows the global
         # one
+        self.ui = ui
         self._data = __builtin__.open(*args, **kwargs)
-        self.read = self._data.read
         self.seek = self._data.seek
         self.close = self._data.close
         self.write = self._data.write
+        self._len = os.fstat(self._data.fileno()).st_size
+        self._pos = 0
+        self._total = len(self) / 1024 * 2
+
+    def read(self, *args, **kwargs):
+        try:
+            ret = self._data.read(*args, **kwargs)
+        except EOFError:
+            self.ui.progress(_('sending'), None)
+        self._pos += len(ret)
+        # We pass double the max for total because we currently have
+        # to send the bundle twice in the case of a server that
+        # requires authentication. Since we can't know until we try
+        # once whether authentication will be required, just lie to
+        # the user and maybe the push succeeds suddenly at 50%.
+        self.ui.progress(_('sending'), self._pos / 1024,
+                         unit=_('kb'), total=self._total)
+        return ret
 
     def __len__(self):
-        return os.fstat(self._data.fileno()).st_size
+        return self._len
 
 def _gen_sendfile(connection):
     def _sendfile(self, data):