From 2db1b2a7187e7ebc543d5c01e585fdc3be7dcb1b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1s=20Touceda?= <chiiph@leap.se>
Date: Thu, 7 Nov 2013 09:46:28 -0300
Subject: Implement processing skipped mail regularly

---
 src/leap/mx/mail_receiver.py | 76 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 71 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/leap/mx/mail_receiver.py b/src/leap/mx/mail_receiver.py
index 785be2e..3890eb2 100644
--- a/src/leap/mx/mail_receiver.py
+++ b/src/leap/mx/mail_receiver.py
@@ -35,7 +35,7 @@ except ImportError:
 from email import message_from_string
 
 from twisted.application.service import Service
-from twisted.internet import inotify, defer
+from twisted.internet import inotify, defer, task
 from twisted.python import filepath, log
 
 from leap.common.mail import get_email_charset
@@ -74,6 +74,7 @@ class MailReceiver(Service):
         self._users_cdb = users_cdb
         self._directories = directories
         self._domain = socket.gethostbyaddr(socket.gethostname())[0]
+        self._processing_skipped = False
 
     def startService(self):
         """
@@ -91,6 +92,10 @@ class MailReceiver(Service):
                           callbacks=[self._process_incoming_email],
                           recursive=recursive)
 
+        self._lcall = task.LoopingCall(self._process_skipped)
+        # Run once every half an hour, but don't start right now
+        self._lcall.start(interval=60*30, now=False)
+
     def _encrypt_message(self, pubkey, message):
         """
         Given a public key and a message, it encrypts the message to
@@ -109,7 +114,7 @@ class MailReceiver(Service):
         if pubkey is None or len(pubkey) == 0:
             log.msg("_encrypt_message: Something went wrong, here's all "
                     "I know: %r" % (pubkey,))
-            return None, None
+            return None
 
         doc = SoledadDocument(doc_id=str(pyuuid.uuid4()))
 
@@ -211,6 +216,8 @@ class MailReceiver(Service):
         uuid = None
 
         delivereds = mail.get_all("Delivered-To")
+        if delivereds is None:
+            return None
         for to in delivereds:
             name, addr = email.utils.parseaddr(to)
             parts = addr.split("@")
@@ -220,8 +227,60 @@ class MailReceiver(Service):
 
         return uuid
 
+    def sleep(self, secs):
+        """
+        Async sleep for a defer. Use this when you want to wait for
+        another (non atomic) defer to finish.
+
+        :param secs: seconds to wait (not really accurate, it depends
+                     on the event queue)
+        :type secs: int
+
+        :rtype: twisted.internet.defer.Deferred
+        """
+        from twisted.internet import reactor
+        d = defer.Deferred()
+        reactor.callLater(secs, d.callback, None)
+        return d
+
+    @defer.inlineCallbacks
+    def _process_skipped(self):
+        """
+        Recursively or not (depending on the configuration) process
+        all the watched directories for unprocessed mail and try to
+        process it.
+        """
+        if self._processing_skipped:
+            defer.returnValue(None)
+
+        self._processing_skipped = True
+        log.msg("Starting processing skipped mail...")
+        log.msg("-"*50)
+
+        for directory, recursive in self._directories:
+            for root, dirs, files in os.walk(directory):
+                for fname in files:
+                    fullpath = os.path.join(root, fname)
+                    fpath = filepath.FilePath(fullpath)
+                    yield self._step_process_mail_backend(fpath)
+
+                if not recursive:
+                    break
+
+        self._processing_skipped = False
+        log.msg("+"*50)
+        log.msg("Done processing skipped mail")
+
     @defer.inlineCallbacks
     def _step_process_mail_backend(self, filepath):
+        """
+        Processes the email pointed by filepath in an async
+        fashion. yield this method in another inlineCallbacks method
+        or return it for it to be run.
+
+        :param filepath: Path of the file that changed
+        :type filepath: twisted.python.filepath.FilePath
+        """
         log.msg("Processing new mail at %r" % (filepath.path,))
         with filepath.open("r") as f:
             mail_data = f.read()
@@ -229,7 +288,7 @@ class MailReceiver(Service):
             uuid = self._get_owner(mail)
             if uuid is None:
                 log.msg("Don't know how to deliver mail %r, skipping..." %
-                        filepath.path)
+                        (filepath.path,))
                 defer.returnValue(None)
             log.msg("Mail owner: %s" % (uuid,))
 
@@ -238,6 +297,9 @@ class MailReceiver(Service):
                 defer.returnValue(None)
 
             pubkey = yield self._users_cdb.getPubKey(uuid)
+            if pubkey is None or len(pubkey):
+                log.msg("No public key, stopping the processing chain")
+                defer.returnValue(None)
 
             log.msg("Encrypting message to %s's pubkey" % (uuid,))
             doc = yield self._encrypt_message(pubkey, mail_data)
@@ -260,7 +322,11 @@ class MailReceiver(Service):
         :type mask: int
         """
         try:
+            while self._processing_skipped:
+                log.msg("Waiting for the process of skipped mail to be done...")
+                yield self.sleep(10)  # NO-OP
             if os.path.split(filepath.dirname())[-1]  == "new":
                 yield self._step_process_mail_backend(filepath)
-        except Exception:
-            log.err()
+        except Exception as e:
+            log.msg("Something went wrong while processing {0!r}: {1!r}"
+                    .format(filepath, e))
-- 
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