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Introduce pluggable backends.

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This allows an operator to write a custom messaging backend to handle
whatever transport and format.
This commit is contained in:
Ralph Bean
2017-09-19 13:09:07 -04:00
parent 1f077a12ea
commit 5e08d2ffe4
6 changed files with 92 additions and 156 deletions
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15
module_build_service/config.py
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@@ -26,9 +26,9 @@
import imp
import os
import pkg_resources
import re
from os import sys
import sys
from module_build_service import logger
@@ -500,9 +500,16 @@ class Config(object):
self._log_level = logger.str_to_log_level(level)
def _setifok_messaging(self, s):
""" Validate that the specified messaging backend corresponds with one
of the installed plugins. The MBS core provides two such plugins, but
a third-party could install another usable one.
"""
entrypoints = pkg_resources.iter_entry_points('mbs.messaging_backends')
installed_backends = [e.name for e in entrypoints]
s = str(s)
if s not in ("fedmsg", "amq", "in_memory"):
raise ValueError("Unsupported messaging system.")
if s not in installed_backends:
raise ValueError("Uninstalled messaging system. %r not in %r" % (
s, installed_backends))
self._messaging = s
def _setifok_amq_recv_addresses(self, l):