Good evening,
Am 2009-11-05 18:02:37, schrieb Professional Software Engineering:
Ah, are you getting messages with URLs, and then from within
procmail, trying to _retrieve_ the URL?
Right and in 95% of all cases it is working.
Do these need to be
processed in conjunction with the individual messages?
Yes, since the return content of wget should immediately included into
the messages because some messages are important for me.
If not, I'd
seriously consider extracting the necessary URL data and pumping it
into a separate queue, which is processed (and cleared on success)
by an external script. As far as procmail is concerned, it's job
done when it extracts the URL and passes it along to the external
script, which can manage retries.
I have tried this, but I was runing into trouble, while trying to get
the right message to attach the downloaded content.
If that doesn't work for you, and you really need to use the mail
system to manage your retry logic, you could deliver the messages to
a different local user, and have (gawd) a local fetchmail operation
in place to grab from that mailbox. By the same token, a
single-user approach would be to store failing messages (with a
proper lockfile strategy) to a mailbox or mailfolder, and have a
cron job that checks for presence of messages AND connectivity - if
both test true, start calling procmail with each message.
I have tried this too, but since courier-imap is moving messages arround
and changing its filename to have unique names in the Maildir, I had
already unexpected problems with it.
I'd
consider moving the messages to a different directory during
processing, and checking for network failure between each message.
Of course, chances are the network failure is a REMOTE failure, not
your own connection - else you can expect to have a single message
at a time in the queue because the net went down right after you
managed to receive a message. Can't imagine you'd have a stack of
such messages, though perhaps your email ends up being more
persistent than your wget...
Hmmm...
Thanks, Greetings and nice Day/Evening
Michelle Konzack
--
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