From 80f0e428065f84292f20954845500028a77a96e0 Mon Sep 17 00:00:00 2001
From: Kali Kaneko <kali@leap.se>
Date: Mon, 11 Nov 2013 13:45:14 -0200
Subject: refactor callbacks so we properly catch remote errors

---
 src/leap/mail/smtp/gateway.py | 49 +++++++++++++++++++++++++++++++------------
 1 file changed, 36 insertions(+), 13 deletions(-)

(limited to 'src/leap/mail')

diff --git a/src/leap/mail/smtp/gateway.py b/src/leap/mail/smtp/gateway.py
index 6367c0d..7e9e420 100644
--- a/src/leap/mail/smtp/gateway.py
+++ b/src/leap/mail/smtp/gateway.py
@@ -14,7 +14,6 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
-
 """
 LEAP SMTP encrypted gateway.
 
@@ -32,7 +31,6 @@ The following classes comprise the SMTP gateway service:
 
 
 """
-
 import re
 from StringIO import StringIO
 from email.Header import Header
@@ -46,6 +44,7 @@ from twisted.mail import smtp
 from twisted.internet.protocol import ServerFactory
 from twisted.internet import reactor, ssl
 from twisted.internet import defer
+from twisted.internet.threads import deferToThread
 from twisted.python import log
 
 from leap.common.check import leap_assert, leap_assert_type
@@ -415,6 +414,15 @@ class EncryptedMessage(object):
         # unexpected loss of connection; don't save
         self.lines = []
 
+    def sendQueued(self, r):
+        """
+        Callback for the queued message.
+
+        @param r: The result from the last previous callback in the chain.
+        @type r: anything
+        """
+        log.msg(r)
+
     def sendSuccess(self, r):
         """
         Callback for a successful send.
@@ -425,33 +433,51 @@ class EncryptedMessage(object):
         log.msg(r)
         signal(proto.SMTP_SEND_MESSAGE_SUCCESS, self._user.dest.addrstr)
 
-    def sendError(self, e):
+    def sendError(self, failure):
         """
         Callback for an unsuccessfull send.
 
         :param e: The result from the last errback.
         :type e: anything
         """
-        log.msg(e)
-        log.err()
         signal(proto.SMTP_SEND_MESSAGE_ERROR, self._user.dest.addrstr)
+        err = failure.value
+        log.err(err)
+        raise err
 
     def sendMessage(self):
         """
-        Send the message.
-
-        This method will prepare the message (headers and possibly encrypted
-        body) and send it using the ESMTPSenderFactory.
-
+        Sends the message.
         @return: A deferred with callbacks for error and success of this
             message send.
         @rtype: twisted.internet.defer.Deferred
         """
+        # FIXME this should not be blocking the main ui, since it returns
+        # a deferred and it has its own cb set. ???!
+        d = deferToThread(self._sendMessage)
+        d.addCallbacks(self._route_msg, self.sendError)
+        d.addCallbacks(self.sendQueued, self.sendError)
+        return d
+
+    def _sendMessage(self):
+        """
+        Send the message.
+
+        This method will prepare the message (headers and possibly encrypted
+        body)
+        """
         msg = self._msg.as_string(False)
+        return msg
 
+    def _route_msg(self, msg):
+        """
+        Sends the msg using the ESMTPSenderFactory.
+        """
         log.msg("Connecting to SMTP server %s:%s" % (self._host, self._port))
 
+        # we construct a defer to pass to the ESMTPSenderFactory
         d = defer.Deferred()
+        d.addCallbacks(self.sendSuccess, self.sendError)
         # we don't pass an ssl context factory to the ESMTPSenderFactory
         # because ssl will be handled by reactor.connectSSL() below.
         factory = smtp.ESMTPSenderFactory(
@@ -469,9 +495,6 @@ class EncryptedMessage(object):
         reactor.connectSSL(
             self._host, self._port, factory,
             contextFactory=SSLContextFactory(self._cert, self._key))
-        d.addCallback(self.sendSuccess)
-        d.addErrback(self.sendError)
-        return d
 
     #
     # encryption methods
-- 
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