diff options
| -rw-r--r-- | Mailman/Utils.py | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Mailman/Utils.py b/Mailman/Utils.py index 7fb4f75d4..a5117fcec 100644 --- a/Mailman/Utils.py +++ b/Mailman/Utils.py @@ -30,6 +30,7 @@ import random import urlparse import sha import errno +import time from string import whitespace as WHITESPACE from mimelib.MsgReader import MsgReader @@ -678,3 +679,21 @@ def get_domain(): return host else: return mm_cfg.DEFAULT_HOST_NAME + + + +# This algorithm crafts a guaranteed unique message-id. The theory here is +# that pid+listname+host will distinguish the message-id for every process on +# the system, except when process ids wrap around. To further distinguish +# message-ids, we prepend the integral time in seconds since the epoch. It's +# still possible that we'll vend out more than one such message-id per second, +# so we prepend a monotonically incrementing serial number. It's highly +# unlikely that within a single second, there'll be a pid wraparound. +_serial = 0 +def unique_message_id(mlist): + global _serial + msgid = '<mailman.%d.%d.%d.%s@%s>' % ( + _serial, time.time(), os.getpid(), + mlist.internal_name(), mlist.host_name) + _serial += 1 + return msgid |