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Merge pull request #3389 from dwsutherland/publish-data-store-updates
Publish data store updates
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| #!/usr/bin/env python3 | ||
|
|
||
| # THIS FILE IS PART OF THE CYLC SUITE ENGINE. | ||
| # Copyright (C) 2008-2019 NIWA & British Crown (Met Office) & Contributors. | ||
| # | ||
| # This program is free software: you can redistribute it and/or modify | ||
| # it under the terms of the GNU General Public License as published by | ||
| # the Free Software Foundation, either version 3 of the License, or | ||
| # (at your option) any later version. | ||
| # | ||
| # This program is distributed in the hope that it will be useful, | ||
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| # GNU General Public License for more details. | ||
| # | ||
| # You should have received a copy of the GNU General Public License | ||
| # along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| """cylc subscribe [OPTIONS] ARGS | ||
| (This command is for internal use.) | ||
| Invoke suite subscriber to receive published workflow output. | ||
| """ | ||
|
|
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| import json | ||
| import sys | ||
| import time | ||
|
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| from google.protobuf.json_format import MessageToDict | ||
|
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| from cylc.flow.exceptions import ClientError | ||
| from cylc.flow.option_parsers import CylcOptionParser as COP | ||
| from cylc.flow.network import get_location | ||
| from cylc.flow.network.subscriber import WorkflowSubscriber, process_delta_msg | ||
| from cylc.flow.terminal import cli_function | ||
| from cylc.flow.data_store_mgr import DELTAS_MAP | ||
|
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||
| if '--use-ssh' in sys.argv[1:]: | ||
| sys.argv.remove('--use-ssh') | ||
| from cylc.flow.remote import remrun | ||
| if remrun(): | ||
| sys.exit(0) | ||
|
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|
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| def print_message(topic, data, subscriber=None, once=False): | ||
| """Print protobuf message.""" | ||
| print(f'Received: {topic}') | ||
| if topic == 'shutdown': | ||
| print(data.decode('utf-8')) | ||
| subscriber.stop() | ||
| return | ||
| sys.stdout.write( | ||
| json.dumps(MessageToDict(data), indent=4) + '\n') | ||
| if once and subscriber is not None: | ||
| subscriber.stop() | ||
|
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||
|
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| def get_option_parser(): | ||
| """Augment options parser to current context.""" | ||
| parser = COP( | ||
| __doc__, | ||
| argdoc=[ | ||
| ('REG', 'Suite name'), | ||
| ('[USER_AT_HOST]', 'user@host:port, shorthand for --user, ' | ||
| '--host & --port.')], | ||
| comms=True, | ||
| noforce=True | ||
| ) | ||
|
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| delta_keys = list(DELTAS_MAP) | ||
| pb_topics = ("Directly published data-store topics include: '" + | ||
| ("', '").join(delta_keys[:-1]) + | ||
| "' and '" + delta_keys[-1] + "'.") | ||
| parser.add_option( | ||
| "-T", "--topics", | ||
| help="Specify a comma delimited list of subscription topics. " | ||
| + pb_topics, | ||
| action="store", dest="topics", default='workflow') | ||
|
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| parser.add_option( | ||
| "-o", "--once", | ||
| help="Show a single publish then exit.", | ||
| action="store_true", default=False, dest="once") | ||
|
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|
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| return parser | ||
|
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|
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| @cli_function(get_option_parser) | ||
| def main(_, options, *args): | ||
| suite = args[0] | ||
|
|
||
| if len(args) > 1: | ||
| try: | ||
| user_at_host, options.port = args[1].split(':') | ||
| options.owner, options.host = user_at_host.split('@') | ||
| except ValueError: | ||
| print(('USER_AT_HOST must take the form ' | ||
| '"user@host:port"'), file=sys.stderr) | ||
| sys.exit(1) | ||
| elif options.host is None or options.port is None: | ||
| try: | ||
| while True: | ||
| try: | ||
| options.host, _, options.port = get_location( | ||
| suite, options.owner, options.host) | ||
| except (ClientError, IOError, TypeError, ValueError): | ||
| time.sleep(3) | ||
| continue | ||
| break | ||
| except KeyboardInterrupt: | ||
| exit() | ||
|
|
||
| print(f'Connecting to tcp://{options.host}:{options.port}') | ||
| topic_set = set() | ||
| topic_set.add(b'shutdown') | ||
| for topic in options.topics.split(','): | ||
| topic_set.add(topic.encode('utf-8')) | ||
|
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||
| subscriber = WorkflowSubscriber( | ||
| suite, | ||
| host=options.host, | ||
| port=options.port, | ||
| topics=topic_set) | ||
|
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||
| subscriber.loop.create_task( | ||
| subscriber.subscribe( | ||
| process_delta_msg, | ||
| func=print_message, | ||
| subscriber=subscriber, | ||
| once=options.once | ||
| ) | ||
| ) | ||
|
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| # run Python run | ||
| try: | ||
| subscriber.loop.run_forever() | ||
| except (KeyboardInterrupt, SystemExit): | ||
| print('\nDisconnecting') | ||
| subscriber.stop() | ||
| exit() | ||
|
|
||
|
|
||
| if __name__ == '__main__': | ||
| main() |
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