1 files changed, 124 insertions, 0 deletions
diff --git a/qpid/python/qpid/framer.py b/qpid/python/qpid/framer.py
new file mode 100644
index 0000000000..47f57cf649
--- /dev/null
+++ b/qpid/python/qpid/framer.py
@@ -0,0 +1,124 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+import struct, socket
+from exceptions import Closed
+from packer import Packer
+from threading import RLock
+from logging import getLogger
+
+raw = getLogger("qpid.io.raw")
+frm = getLogger("qpid.io.frm")
+
+class FramingError(Exception): pass
+
+class Framer(Packer):
+
+  HEADER="!4s4B"
+
+  def __init__(self, sock):
+    self.sock = sock
+    self.sock_lock = RLock()
+    self.tx_buf = ""
+    self.rx_buf = ""
+    self.security_layer_tx = None
+    self.security_layer_rx = None
+    self.maxbufsize = 65535
+
+  def aborted(self):
+    return False
+
+  def write(self, buf):
+    self.tx_buf += buf
+
+  def flush(self):
+    self.sock_lock.acquire()
+    try:
+      if self.security_layer_tx:
+        status, cipher_buf = self.security_layer_tx.encode(self.tx_buf)
+        if status == False:
+          raise Closed(self.security_layer_tx.getError())
+        self._write(cipher_buf)
+      else:
+        self._write(self.tx_buf)
+      self.tx_buf = ""
+      frm.debug("FLUSHED")
+    finally:
+      self.sock_lock.release()
+
+  def _write(self, buf):
+    while buf:
+      try:
+        n = self.sock.send(buf)
+      except socket.timeout:
+        if self.aborted():
+          raise Closed()
+        else:
+          continue
+      raw.debug("SENT %r", buf[:n])
+      buf = buf[n:]
+
+  ##
+  ## Implementation Note:
+  ##
+  ##    This function was modified to use the SASL security layer for content
+  ##    decryption.  As such, the socket read should read in "self.maxbufsize"
+  ##    instead of "n" (the requested number of octets).  However, since this
+  ##    is one of two places in the code where the socket is read, the read
+  ##    size had to be left at "n".  This is because this function is
+  ##    apparently only used to read the first 8 octets from a TCP socket.  If
+  ##    we read beyond "n" octets, the remaing octets won't be processed and
+  ##    the connection handshake will fail.
+  ##
+  def read(self, n):
+    while len(self.rx_buf) < n:
+      try:
+        s = self.sock.recv(n) # NOTE: instead of "n", arg should be "self.maxbufsize"
+        if self.security_layer_rx:
+          status, s = self.security_layer_rx.decode(s)
+          if status == False:
+            raise Closed(self.security_layer_tx.getError())
+      except socket.timeout:
+        if self.aborted():
+          raise Closed()
+        else:
+          continue
+      except socket.error, e:
+        if self.rx_buf != "":
+          raise e
+        else:
+          raise Closed()
+      if len(s) == 0:
+        raise Closed()
+      self.rx_buf += s
+      raw.debug("RECV %r", s)
+    data = self.rx_buf[0:n]
+    self.rx_buf = self.rx_buf[n:]
+    return data
+
+  def read_header(self):
+    return self.unpack(Framer.HEADER)
+
+  def write_header(self, major, minor):
+    self.sock_lock.acquire()
+    try:
+      self.pack(Framer.HEADER, "AMQP", 1, 1, major, minor)
+      self.flush()
+    finally:
+      self.sock_lock.release()