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https://github.com/avatao-content/baseimage-tutorial-framework
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54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
import logging
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from xmlrpc.client import Fault as SupervisorFault
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from tfw.networking import Scope
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from tfw.components import ProcessManager, LogManager
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LOG = logging.getLogger(__name__)
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class ProcessManagingEventHandler(ProcessManager, LogManager):
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keys = ['processmanager']
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"""
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Event handler that can manage processes managed by supervisor.
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This EventHandler accepts messages that have a data['command'] key specifying
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a command to be executed.
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Every message must contain a data['process_name'] field with the name of the
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process to manage. This is the name specified in supervisor config files like so:
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[program:someprogram]
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Commands available: start, stop, restart, readlog
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(the names are as self-documenting as it gets)
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"""
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def __init__(self, *, supervisor_uri, log_tail=0):
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ProcessManager.__init__(self, supervisor_uri)
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LogManager.__init__(self, supervisor_uri)
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self.log_tail = log_tail
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self.commands = {
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'start': self.start_process,
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'stop': self.stop_process,
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'restart': self.restart_process
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}
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def handle_event(self, message, server_connector):
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try:
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data = message['data']
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try:
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self.commands[data['command']](data['process_name'])
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except SupervisorFault as fault:
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message['data']['error'] = fault.faultString
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finally:
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message['data']['stdout'] = self.read_stdout(
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data['process_name'],
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self.log_tail
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)
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message['data']['stderr'] = self.read_stderr(
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data['process_name'],
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self.log_tail
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)
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server_connector.send_message(message, scope=Scope.WEBSOCKET)
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except KeyError:
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LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
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