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+Digesting
+=========
+
+Mailman crafts and sends digests by a separate digest queue runner process.
+This starts by a number of messages being posted to the mailing list.
+
+ >>> mlist = create_list('test@example.com')
+ >>> mlist.digest_size_threshold = 0.5
+ >>> mlist.volume = 1
+ >>> mlist.next_digest_number = 1
+ >>> size = 0
+
+ >>> from string import Template
+ >>> process = config.handlers['to-digest'].process
+ >>> for i in range(1, 5):
+ ... text = Template("""\
+ ... From: aperson@example.com
+ ... To: xtest@example.com
+ ... Subject: Test message $i
+ ...
+ ... Here is message $i
+ ... """).substitute(i=i)
+ ... msg = message_from_string(text)
+ ... process(mlist, msg, {})
+ ... size += len(text)
+ ... if size >= mlist.digest_size_threshold * 1024:
+ ... break
+
+The queue runner gets kicked off when a marker message gets dropped into the
+digest queue. The message metadata points to the mailbox file containing the
+messages to put in the digest.
+
+ >>> digestq = config.switchboards['digest']
+ >>> len(digestq.files)
+ 1
+
+ >>> from mailman.testing.helpers import get_queue_messages
+ >>> entry = get_queue_messages('digest')[0]
+
+The marker message is empty.
+
+ >>> print entry.msg.as_string()
+
+But the message metadata has a reference to the digest file.
+
+ >>> dump_msgdata(entry.msgdata)
+ _parsemsg : False
+ digest_number: 1
+ digest_path : .../lists/test@example.com/digest.1.1.mmdf
+ listname : test@example.com
+ version : 3
+ volume : 1
+
+ # Put the messages back in the queue for the runner to handle.
+ >>> filebase = digestq.enqueue(entry.msg, entry.msgdata)
+
+There are 4 messages in the digest.
+
+ >>> from mailman.utilities.mailbox import Mailbox
+ >>> sum(1 for item in Mailbox(entry.msgdata['digest_path']))
+ 4
+
+When the queue runner runs, it processes the digest mailbox, crafting both the
+plain text (RFC 1153) digest and the MIME digest.
+
+ >>> from mailman.queue.digest import DigestRunner
+ >>> from mailman.testing.helpers import make_testable_runner
+ >>> runner = make_testable_runner(DigestRunner)
+ >>> runner.run()
+
+The digest runner places both digests into the virgin queue for final
+delivery.
+
+ >>> messages = get_queue_messages('virgin')
+ >>> len(messages)
+ 2
+
+The MIME digest is a multipart, and the RFC 1153 digest is the other one.
+
+ >>> if messages[0].msg.is_multipart():
+ ... mime = messages[0].msg
+ ... rfc1153 = messages[1].msg
+ ... else:
+ ... mime = messages[1].msg
+ ... rfc1153 = messages[0].msg
+
+The MIME digest has lots of good stuff, all contained in the multipart.
+
+ >>> print mime.as_string()
+ Content-Type: multipart/mixed; boundary="===============...=="
+ MIME-Version: 1.0
+ From: test-request@example.com
+ Subject: Test Digest, Vol 1, Issue 1
+ To: test@example.com
+ Reply-To: test@example.com
+ Date: ...
+ Message-ID: ...
+ <BLANKLINE>
+ --===============...==
+ Content-Type: text/plain; charset="us-ascii"
+ MIME-Version: 1.0
+ Content-Transfer-Encoding: 7bit
+ Content-Description: Test Digest, Vol 1, Issue 1
+ <BLANKLINE>
+ Send Test mailing list submissions to
+ test@example.com
+ <BLANKLINE>
+ To subscribe or unsubscribe via the World Wide Web, visit
+ http://lists.example.com/listinfo/test@example.com
+ or, via email, send a message with subject or body 'help' to
+ test-request@example.com
+ <BLANKLINE>
+ You can reach the person managing the list at
+ test-owner@example.com
+ <BLANKLINE>
+ When replying, please edit your Subject line so it is more specific
+ than "Re: Contents of Test digest..."
+ <BLANKLINE>
+ --===============...==
+ Content-Type: text/plain; charset="us-ascii"
+ MIME-Version: 1.0
+ Content-Transfer-Encoding: 7bit
+ Content-Description: Today's Topics (4 messages)
+ <BLANKLINE>
+ Today's Topics:
+ <BLANKLINE>
+ 1. Test message 1 (aperson@example.com)
+ 2. Test message 2 (aperson@example.com)
+ 3. Test message 3 (aperson@example.com)
+ 4. Test message 4 (aperson@example.com)
+ <BLANKLINE>
+ --===============...==
+ Content-Type: message/rfc822
+ MIME-Version: 1.0
+ <BLANKLINE>
+ From: aperson@example.com
+ To: xtest@example.com
+ Subject: Test message 1
+ <BLANKLINE>
+ Here is message 1
+ <BLANKLINE>
+ --===============...==
+ Content-Type: message/rfc822
+ MIME-Version: 1.0
+ <BLANKLINE>
+ From: aperson@example.com
+ To: xtest@example.com
+ Subject: Test message 2
+ <BLANKLINE>
+ Here is message 2
+ <BLANKLINE>
+ --===============...==
+ Content-Type: message/rfc822
+ MIME-Version: 1.0
+ <BLANKLINE>
+ From: aperson@example.com
+ To: xtest@example.com
+ Subject: Test message 3
+ <BLANKLINE>
+ Here is message 3
+ <BLANKLINE>
+ --===============...==
+ Content-Type: message/rfc822
+ MIME-Version: 1.0
+ <BLANKLINE>
+ From: aperson@example.com
+ To: xtest@example.com
+ Subject: Test message 4
+ <BLANKLINE>
+ Here is message 4
+ <BLANKLINE>
+ --===============...==
+ Content-Type: text/plain; charset="us-ascii"
+ MIME-Version: 1.0
+ Content-Transfer-Encoding: 7bit
+ Content-Description: Digest Footer
+ <BLANKLINE>
+ _______________________________________________
+ Test mailing list
+ test@example.com
+ http://lists.example.com/listinfo/test@example.com
+ <BLANKLINE>
+ --===============...==--
+
+The RFC 1153 contains the digest in a single plain text message.
+
+ >>> print rfc1153.as_string()
+ From: test-request@example.com
+ Subject: Test Digest, Vol 1, Issue 1
+ To: test@example.com
+ Reply-To: test@example.com
+ Date: ...
+ Message-ID: ...
+ MIME-Version: 1.0
+ Content-Type: text/plain; charset="us-ascii"
+ Content-Transfer-Encoding: 7bit
+ <BLANKLINE>
+ Send Test mailing list submissions to
+ test@example.com
+ <BLANKLINE>
+ To subscribe or unsubscribe via the World Wide Web, visit
+ http://lists.example.com/listinfo/test@example.com
+ or, via email, send a message with subject or body 'help' to
+ test-request@example.com
+ <BLANKLINE>
+ You can reach the person managing the list at
+ test-owner@example.com
+ <BLANKLINE>
+ When replying, please edit your Subject line so it is more specific
+ than "Re: Contents of Test digest..."
+ <BLANKLINE>
+ <BLANKLINE>
+ Today's Topics:
+ <BLANKLINE>
+ 1. Test message 1 (aperson@example.com)
+ 2. Test message 2 (aperson@example.com)
+ 3. Test message 3 (aperson@example.com)
+ 4. Test message 4 (aperson@example.com)
+ <BLANKLINE>
+ <BLANKLINE>
+ ----------------------------------------------------------------------
+ <BLANKLINE>
+ From: aperson@example.com
+ Subject: Test message 1
+ To: xtest@example.com
+ Message-ID: ...
+ <BLANKLINE>
+ Here is message 1
+ <BLANKLINE>
+ ------------------------------
+ <BLANKLINE>
+ From: aperson@example.com
+ Subject: Test message 2
+ To: xtest@example.com
+ Message-ID: ...
+ <BLANKLINE>
+ Here is message 2
+ <BLANKLINE>
+ ------------------------------
+ <BLANKLINE>
+ From: aperson@example.com
+ Subject: Test message 3
+ To: xtest@example.com
+ Message-ID: ...
+ <BLANKLINE>
+ Here is message 3
+ <BLANKLINE>
+ ------------------------------
+ <BLANKLINE>
+ From: aperson@example.com
+ Subject: Test message 4
+ To: xtest@example.com
+ Message-ID: ...
+ <BLANKLINE>
+ Here is message 4
+ <BLANKLINE>
+ ------------------------------
+ <BLANKLINE>
+ _______________________________________________
+ Test mailing list
+ test@example.com
+ http://lists.example.com/listinfo/test@example.com
+ <BLANKLINE>
+ <BLANKLINE>
+ End of Test Digest, Vol 1, Issue 1
+ **********************************
+ <BLANKLINE>
+
+
+Internationalized digests
+-------------------------
+
+When messages come in with a content-type character set different than that of
+the list's preferred language, recipients will get an internationalized
+digest. French is not enabled by default site-wide, so enable that now.
+
+ >>> config.languages.enable_language('fr')
+
+ # Simulate the site administrator setting the default server language to
+ # French in the configuration file. Without this, the English template
+ # will be found and the masthead won't be translated.
+ >>> config.push('french', """
+ ... [mailman]
+ ... default_language: fr
+ ... """)
+
+ >>> mlist.preferred_language = u'fr'
+ >>> msg = message_from_string("""\
+ ... From: aperson@example.org
+ ... To: test@example.com
+ ... Subject: =?iso-2022-jp?b?GyRCMGxIVhsoQg==?=
+ ... MIME-Version: 1.0
+ ... Content-Type: text/plain; charset=iso-2022-jp
+ ... Content-Transfer-Encoding: 7bit
+ ...
+ ... \x1b$B0lHV\x1b(B
+ ... """)
+
+Set the digest threshold to zero so that the digests will be sent immediately.
+
+ >>> mlist.digest_size_threshold = 0
+ >>> process(mlist, msg, {})
+
+The marker message is sitting in the digest queue.
+
+ >>> len(digestq.files)
+ 1
+ >>> entry = get_queue_messages('digest')[0]
+ >>> dump_msgdata(entry.msgdata)
+ _parsemsg : False
+ digest_number: 2
+ digest_path : .../lists/test@example.com/digest.1.2.mmdf
+ listname : test@example.com
+ version : 3
+ volume : 1
+
+The digest queue runner runs a loop, placing the two digests into the virgin
+queue.
+
+ # Put the messages back in the queue for the runner to handle.
+ >>> filebase = digestq.enqueue(entry.msg, entry.msgdata)
+ >>> runner.run()
+ >>> messages = get_queue_messages('virgin')
+ >>> len(messages)
+ 2
+
+One of which is the MIME digest and the other of which is the RFC 1153 digest.
+
+ >>> if messages[0].msg.is_multipart():
+ ... mime = messages[0].msg
+ ... rfc1153 = messages[1].msg
+ ... else:
+ ... mime = messages[1].msg
+ ... rfc1153 = messages[0].msg
+
+You can see that the digests contain a mix of French and Japanese.
+
+ >>> print mime.as_string()
+ Content-Type: multipart/mixed; boundary="===============...=="
+ MIME-Version: 1.0
+ From: test-request@example.com
+ Subject: Groupe Test, Vol. 1, Parution 2
+ To: test@example.com
+ Reply-To: test@example.com
+ Date: ...
+ Message-ID: ...
+ <BLANKLINE>
+ --===============...==
+ Content-Type: text/plain; charset="iso-8859-1"
+ MIME-Version: 1.0
+ Content-Transfer-Encoding: quoted-printable
+ Content-Description: Groupe Test, Vol. 1, Parution 2
+ <BLANKLINE>
+ Envoyez vos messages pour la liste Test =E0
+ test@example.com
+ <BLANKLINE>
+ Pour vous (d=E9s)abonner par le web, consultez
+ http://lists.example.com/listinfo/test@example.com
+ <BLANKLINE>
+ ou, par courriel, envoyez un message avec =AB=A0help=A0=BB dans le corps ou
+ dans le sujet =E0
+ test-request@example.com
+ <BLANKLINE>
+ Vous pouvez contacter l'administrateur de la liste =E0 l'adresse
+ test-owner@example.com
+ <BLANKLINE>
+ Si vous r=E9pondez, n'oubliez pas de changer l'objet du message afin
+ qu'il soit plus sp=E9cifique que =AB=A0Re: Contenu du groupe de Test...=A0=
+ =BB
+ --===============...==
+ Content-Type: text/plain; charset="utf-8"
+ MIME-Version: 1.0
+ Content-Transfer-Encoding: base64
+ Content-Description: Today's Topics (1 messages)
+ <BLANKLINE>
+ VGjDqG1lcyBkdSBqb3VyIDoKCiAgIDEuIOS4gOeVqiAoYXBlcnNvbkBleGFtcGxlLm9yZykK
+ <BLANKLINE>
+ --===============...==
+ Content-Type: message/rfc822
+ MIME-Version: 1.0
+ <BLANKLINE>
+ From: aperson@example.org
+ To: test@example.com
+ Subject: =?iso-2022-jp?b?GyRCMGxIVhsoQg==?=
+ MIME-Version: 1.0
+ Content-Type: text/plain; charset=iso-2022-jp
+ Content-Transfer-Encoding: 7bit
+ <BLANKLINE>
+ 一番
+ <BLANKLINE>
+ --===============...==
+ Content-Type: text/plain; charset="iso-8859-1"
+ MIME-Version: 1.0
+ Content-Transfer-Encoding: quoted-printable
+ Content-Description: =?utf-8?q?Pied_de_page_des_remises_group=C3=A9es?=
+ <BLANKLINE>
+ _______________________________________________
+ Test mailing list
+ test@example.com
+ http://lists.example.com/listinfo/test@example.com
+ <BLANKLINE>
+ --===============...==--
+
+The RFC 1153 digest will be encoded in UTF-8 since it contains a mixture of
+French and Japanese characters.
+
+ >>> print rfc1153.as_string()
+ From: test-request@example.com
+ Subject: Groupe Test, Vol. 1, Parution 2
+ To: test@example.com
+ Reply-To: test@example.com
+ Date: ...
+ Message-ID: ...
+ MIME-Version: 1.0
+ Content-Type: text/plain; charset="utf-8"
+ Content-Transfer-Encoding: base64
+ <BLANKLINE>
+ RW52b...
+ Y29tC...
+ Ly9sa...
+ dXJya...
+ cyBvd...
+ dmV6I...
+ dGVzd...
+ ZGUgY...
+ Zmlxd...
+ ZXMgZ...
+ LS0tL...
+ LS0tL...
+ c3RAZ...
+ d2RvZ...
+ LWpwC...
+ X19fX...
+ dEBle...
+ cGxlL...
+ KioqK...
+ <BLANKLINE>
+
+The content can be decoded to see the actual digest text.
+
+ # We must display the repr of the decoded value because doctests cannot
+ # handle the non-ascii characters.
+ >>> [repr(line) for line in rfc1153.get_payload(decode=True).splitlines()]
+ ["'Envoyez vos messages pour la liste Test \\xc3\\xa0'",
+ "'\\ttest@example.com'",
+ "''",
+ "'Pour vous (d\\xc3\\xa9s)abonner par le web, consultez'",
+ "'\\thttp://lists.example.com/listinfo/test@example.com'",
+ "''",
+ "'ou, par courriel, envoyez un message avec \\xc2\\xab\\xc2\\xa0...
+ "'dans le sujet \\xc3\\xa0'",
+ "'\\ttest-request@example.com'",
+ "''",
+ '"Vous pouvez contacter l\'administrateur de la liste \\xc3\\xa0 ...
+ "'\\ttest-owner@example.com'",
+ "''",
+ '"Si vous r\\xc3\\xa9pondez, n\'oubliez pas de changer l\'objet du ...
+ '"qu\'il soit plus sp\\xc3\\xa9cifique que \\xc2\\xab\\xc2\\xa0Re: ...
+ "''",
+ "'Th\\xc3\\xa8mes du jour :'",
+ "''",
+ "' 1. \\xe4\\xb8\\x80\\xe7\\x95\\xaa (aperson@example.org)'",
+ "''",
+ "''",
+ "'---------------------------------------------------------------------...
+ "''",
+ "'From: aperson@example.org'",
+ "'Subject: \\xe4\\xb8\\x80\\xe7\\x95\\xaa'",
+ "'To: test@example.com'",
+ "'Message-ID: ...
+ "'Content-Type: text/plain; charset=iso-2022-jp'",
+ "''",
+ "'\\xe4\\xb8\\x80\\xe7\\x95\\xaa'",
+ "''",
+ "'------------------------------'",
+ "''",
+ "'_______________________________________________'",
+ "'Test mailing list'",
+ "'test@example.com'",
+ "'http://lists.example.com/listinfo/test@example.com'",
+ "''",
+ "''",
+ "'Fin de Groupe Test, Vol. 1, Parution 2'",
+ "'**************************************'"]