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=========
Pipelines
=========
Pipelines process messages that have been accepted for posting, applying any
modifications and also sending copies of the message to the archives, digests,
NNTP, and outgoing queues. Pipelines are named and consist of a sequence of
handlers, each of which is applied in turn. Unlike rules and chains, there is
no way to stop a pipeline from processing the message once it's started.
>>> mlist = create_list('test@example.com')
>>> print(mlist.posting_pipeline)
default-posting-pipeline
>>> from mailman.core.pipelines import process
Processing a message
====================
Messages hit the pipeline after they've been accepted for posting.
>>> msg = message_from_string("""\
... From: aperson@example.com
... To: test@example.com
... Subject: My first post
... Message-ID: <first>
... X-Message-ID-Hash: 4CMWUN6BHVCMHMDAOSJZ2Q72G5M32MWB
...
... First post!
... """)
>>> msgdata = {}
>>> process(mlist, msg, msgdata, mlist.posting_pipeline)
The message has been modified with additional headers, footer decorations,
etc.
>>> print(msg.as_string())
From: aperson@example.com
To: test@example.com
Message-ID: <first>
X-Message-ID-Hash: 4CMWUN6BHVCMHMDAOSJZ2Q72G5M32MWB
Subject: [Test] My first post
X-Mailman-Version: ...
Precedence: list
List-Id: <test.example.com>
List-Post: <mailto:test@example.com>
List-Subscribe: <http://lists.example.com/listinfo/test@example.com>,
<mailto:test-join@example.com>
Archived-At: http://lists.example.com/.../4CMWUN6BHVCMHMDAOSJZ2Q72G5M32MWB
List-Unsubscribe: <http://lists.example.com/listinfo/test@example.com>,
<mailto:test-leave@example.com>
List-Archive: <http://lists.example.com/archives/test@example.com>
List-Help: <mailto:test-request@example.com?subject=help>
<BLANKLINE>
First post!
<BLANKLINE>
The message metadata has information about recipients and other stuff.
However there are currently no recipients for this message.
>>> dump_msgdata(msgdata)
original_sender : aperson@example.com
original_subject: My first post
recipients : set([])
stripped_subject: My first post
After pipeline processing, the message is now sitting in various other
processing queues.
::
>>> from mailman.testing.helpers import get_queue_messages
>>> messages = get_queue_messages('archive')
>>> len(messages)
1
>>> print(messages[0].msg.as_string())
From: aperson@example.com
To: test@example.com
Message-ID: <first>
X-Message-ID-Hash: 4CMWUN6BHVCMHMDAOSJZ2Q72G5M32MWB
Subject: [Test] My first post
X-Mailman-Version: ...
Precedence: list
List-Id: <test.example.com>
...
<BLANKLINE>
First post!
<BLANKLINE>
>>> dump_msgdata(messages[0].msgdata)
_parsemsg : False
original_sender : aperson@example.com
original_subject: My first post
recipients : set([])
stripped_subject: My first post
version : 3
This mailing list is not linked to an NNTP newsgroup, so there's nothing in
the outgoing nntp queue.
>>> messages = get_queue_messages('nntp')
>>> len(messages)
0
The outgoing queue will hold the copy of the message that will actually get
delivered to end recipients.
::
>>> messages = get_queue_messages('out')
>>> len(messages)
1
>>> print(messages[0].msg.as_string())
From: aperson@example.com
To: test@example.com
Message-ID: <first>
X-Message-ID-Hash: 4CMWUN6BHVCMHMDAOSJZ2Q72G5M32MWB
Subject: [Test] My first post
X-Mailman-Version: ...
Precedence: list
List-Id: <test.example.com>
...
<BLANKLINE>
First post!
<BLANKLINE>
>>> dump_msgdata(messages[0].msgdata)
_parsemsg : False
listname : test@example.com
original_sender : aperson@example.com
original_subject: My first post
recipients : set([])
stripped_subject: My first post
version : 3
There's now one message in the digest mailbox, getting ready to be sent.
::
>>> from mailman.testing.helpers import digest_mbox
>>> digest = digest_mbox(mlist)
>>> sum(1 for mboxmsg in digest)
1
>>> print(list(digest)[0].as_string())
From: aperson@example.com
To: test@example.com
Message-ID: <first>
X-Message-ID-Hash: 4CMWUN6BHVCMHMDAOSJZ2Q72G5M32MWB
Subject: [Test] My first post
X-Mailman-Version: ...
Precedence: list
List-Id: <test.example.com>
...
<BLANKLINE>
First post!
<BLANKLINE>
.. Clean up the digests
>>> digest.clear()
>>> digest.flush()
>>> sum(1 for msg in digest_mbox(mlist))
0
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