baseimage-tutorial-framework/tfw/components/process_management/process_handler.py

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import logging
from xmlrpc.client import Fault as SupervisorFault
from tfw.internals.networking import Scope
from .supervisor import ProcessManager, ProcessLogManager
LOG = logging.getLogger(__name__)
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class ProcessHandler(ProcessManager, ProcessLogManager):
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keys = ['process']
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def __init__(self, *, supervisor_uri, log_tail=0):
ProcessManager.__init__(self, supervisor_uri)
ProcessLogManager.__init__(self, supervisor_uri)
self.log_tail = log_tail
self.commands = {
'process.start': self.start_process,
'process.stop': self.stop_process,
'process.restart': self.restart_process
}
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def handle_event(self, message, connector):
try:
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try:
self.commands[message['key']](message['name'])
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except SupervisorFault as fault:
message['error'] = fault.faultString
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finally:
message['stdout'] = self.read_stdout(
message['name'],
self.log_tail
)
message['stderr'] = self.read_stderr(
message['name'],
self.log_tail
)
connector.send_message(message, scope=Scope.WEBSOCKET)
except KeyError:
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if not message['key'].startswith('process.log'):
LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)