51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
import inspect
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import os
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import subprocess
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import sys
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from platypush.backend import Backend
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class NoderedBackend(Backend):
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"""
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This backend publishes platypush actions to a Node-RED instance.
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If you enable this backend on a host that runs Node-RED then a new block (platypush -> run) can be
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used in your flows. This block will accept JSON requests as input in the format
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``{"type":"request", "action":"plugin.name.action_name", "args": {...}}`` and return the output
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of the action as block output, or raise an exception if the action failed.
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Requires:
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* **pynodered** (``pip install pynodered``)
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"""
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def __init__(self, port: int = 5051, *args, **kwargs):
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"""
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:param port: Listening port for the local publishing web server (default: 5051)
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"""
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super().__init__(*args, **kwargs)
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self.port = port
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self._runner_path = os.path.join(
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os.path.dirname(inspect.getfile(self.__class__)), 'runner.py')
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self._server = None
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def on_stop(self):
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super().on_stop()
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if self._server:
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self._server.terminate()
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self._server = None
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def run(self):
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super().run()
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self.register_service(port=self.port, name='node')
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self._server = subprocess.Popen([sys.executable, '-m', 'pynodered.server',
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'--port', str(self.port), self._runner_path])
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self.logger.info('Started Node-RED backend on port {}'.format(self.port))
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self._server.wait()
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# vim:sw=4:ts=4:et:
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