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https://pagure.io/fm-orchestrator.git
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db20065e74
Message classes and FedmsgMessageParser are moved into dedicated Python module under scheduler/ directory. FedmsgMessageParser is decoupled from messaging.py by initializing a parser object with known fedmsg services. This decouple avoids cycle import between parser.py and messaging.py. Signed-off-by: Chenxiong Qi <cqi@redhat.com>
119 lines
4.6 KiB
Python
119 lines
4.6 KiB
Python
# -*- coding: utf-8 -*-
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# SPDX-License-Identifier: MIT
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import re
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from module_build_service import log
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from module_build_service.scheduler import events
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class MessageParser(object):
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"""Base class for parsing messages received from a specific message bus
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:param topic_categories: list of known services, that MBS can handle the
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messages sent from them. For example, a value could be
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``["buildsys", "mbs", "greenwave"]``.
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:type topic_categories: list[str]
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"""
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def __init__(self, topic_categories):
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self.topic_categories = topic_categories
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def parse(self, msg):
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raise NotImplementedError()
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class FedmsgMessageParser(MessageParser):
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def parse(self, msg):
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"""
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Parse a received message and convert it to a consistent format
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:param dict msg: the message contents from the message bus.
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:return: a mapping representing the corresponding event.
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If the topic isn't recognized, None is returned.
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:rtype: dict or None
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"""
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if "body" in msg:
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msg = msg["body"]
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topic = msg["topic"]
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categories_re = "|".join(map(re.escape, self.topic_categories))
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regex_pattern = re.compile(
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r"(?P<category>" + categories_re + r")"
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r"(?:(?:\.)(?P<object>build|repo|module|decision))?"
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r"(?:(?:\.)(?P<subobject>state|build))?"
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r"(?:\.)(?P<event>change|done|end|tag|update)$"
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)
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regex_results = re.search(regex_pattern, topic)
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if regex_results:
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category = regex_results.group("category")
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object = regex_results.group("object")
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subobject = regex_results.group("subobject")
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event = regex_results.group("event")
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msg_id = msg.get("msg_id")
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msg_inner_msg = msg.get("msg")
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# If there isn't a msg dict in msg then this message can be skipped
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if not msg_inner_msg:
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log.debug(
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"Skipping message without any content with the " 'topic "{0}"'.format(topic))
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return None
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# Ignore all messages from the secondary koji instances.
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if category == "buildsys":
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instance = msg_inner_msg.get("instance", "primary")
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if instance != "primary":
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log.debug("Ignoring message from %r koji hub." % instance)
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return
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if object == "build" and subobject == "state" and event == "change":
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build_id = msg_inner_msg.get("build_id")
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task_id = msg_inner_msg.get("task_id")
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build_new_state = msg_inner_msg.get("new")
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build_name = msg_inner_msg.get("name")
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build_version = msg_inner_msg.get("version")
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build_release = msg_inner_msg.get("release")
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return events.KojiBuildChange(
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msg_id,
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build_id,
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task_id,
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build_new_state,
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build_name,
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build_version,
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build_release,
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)
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if object == "repo" and subobject is None and event == "done":
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repo_tag = msg_inner_msg.get("tag")
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return events.KojiRepoChange(msg_id, repo_tag)
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if event == "tag":
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tag = msg_inner_msg.get("tag")
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name = msg_inner_msg.get("name")
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version = msg_inner_msg.get("version")
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release = msg_inner_msg.get("release")
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nvr = None
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if name and version and release:
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nvr = "-".join((name, version, release))
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return events.KojiTagChange(msg_id, tag, name, nvr)
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if (category == "mbs"
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and object == "module" and subobject == "state" and event == "change"):
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return events.MBSModule(
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msg_id,
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msg_inner_msg.get("id"),
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msg_inner_msg.get("state"))
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if (category == "greenwave"
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and object == "decision" and subobject is None and event == "update"):
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return events.GreenwaveDecisionUpdate(
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msg_id=msg_id,
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decision_context=msg_inner_msg.get("decision_context"),
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policies_satisfied=msg_inner_msg.get("policies_satisfied"),
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subject_identifier=msg_inner_msg.get("subject_identifier"),
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)
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