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https://github.com/avatao-content/test-tutorial-framework
synced 2024-12-05 02:11:32 +00:00
Implement simple pipe-based event handlers
This commit is contained in:
R. Richard
parent
fe49e61f82
commit
6edc8d8bd5
154
solvable/src/pipe_io_auxlib.py
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154
solvable/src/pipe_io_auxlib.py
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from json import dumps, loads
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from tfw.crypto import KeyManager, sign_message, verify_message
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from tfw.components import PipeIOEventHandlerBase
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from tfw.components.pipe_io_event_handler import DEFAULT_PERMISSIONS
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class DeployPipeIOEventHandler(PipeIOEventHandlerBase):
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# pylint: disable=too-many-arguments
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def __init__(
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self, in_pipe_path, out_pipe_path, process,
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permissions=DEFAULT_PERMISSIONS
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):
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self.expected = False
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self.process = process
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self.onsuccess = {
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'key': 'processmanager',
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'data': {
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'process_name': process,
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'command': 'restart'
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}
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}
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self.onerror = {
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'key': 'processmanager',
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'data': {
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'process_name': process,
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'error': True
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}
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}
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super().__init__('processmanager', in_pipe_path, out_pipe_path, permissions)
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def handle_event(self, message):
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if message == self.onsuccess:
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self.expected = True
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self.pipe_io.send_message(b'deploy')
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def handle_pipe_event(self, message_bytes):
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if not self.expected:
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raise ValueError(
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f'{self.pipe_io.in_pipe}: There is nothing to deploy.'
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)
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self.expected = False
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if message_bytes == b'true':
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self.server_connector.send(self.onsuccess)
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elif message_bytes == b'false':
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self.server_connector.send(self.onerror)
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else:
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raise ValueError(
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f'{self.pipe_io.in_pipe}: Expected "true" or "false".'
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)
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class IdePipeIOEventHandler(PipeIOEventHandlerBase):
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# pylint: disable=too-many-arguments
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def __init__(
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self, in_pipe_path, out_pipe_path, filename,
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permissions=DEFAULT_PERMISSIONS,
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selected=True
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):
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self.selected = selected
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self.filename = filename
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super().__init__('ide', in_pipe_path, out_pipe_path, permissions)
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def handle_event(self, message):
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data = message['data']
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if data['command'] == 'select':
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self.selected = data['filename'] == self.filename
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elif data['command'] == 'write' and self.selected:
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clean = data['content'].replace('\n', '\\n')
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self.pipe_io.send_message(clean.encode())
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def handle_pipe_event(self, message_bytes):
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if not self.selected:
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self.server_connector.send({
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'key': 'mirror',
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'data': {
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'key': 'ide',
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'data': {
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'command': 'select',
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'filename': self.filename
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}
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}
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})
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self.server_connector.send({
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'key': 'mirror',
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'data': {
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'key': 'ide',
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'data': {
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'command': 'write',
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'content': message_bytes.decode().replace('\\n', '\n')
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}
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}
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})
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self.server_connector.send({
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'key': 'mirror',
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'data': {
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'key': 'ide',
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'data': {
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'command': 'read'
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}
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}
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})
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class FSMPipeIOEventHandler(PipeIOEventHandlerBase):
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def __init__(self, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
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super().__init__(
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['fsm', 'fsm_update'],
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in_pipe_path, out_pipe_path, permissions
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)
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def handle_event(self, message):
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if 'current_state' in message['data']:
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self.pipe_io.send_message(message['data']['current_state'].encode())
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def handle_pipe_event(self, message_bytes):
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self.server_connector.send({
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'key': '',
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'trigger': message_bytes.decode()
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})
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class MsgSignPipeIOEventHandler(PipeIOEventHandlerBase):
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def __init__(
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self, in_pipe_path, out_pipe_path,
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permissions=DEFAULT_PERMISSIONS,
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forwarding=True
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):
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self.forwarding = forwarding
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self.auth_key = KeyManager().auth_key
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super().__init__(None, in_pipe_path, out_pipe_path, permissions)
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def handle_event(self, message):
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return
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def handle_pipe_event(self, message_bytes):
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message = loads(message_bytes)
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sign_message(self.auth_key, message)
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if self.forwarding:
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self.server_connector.send(message)
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self.pipe_io.send_message(dumps(message).encode())
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class MsgVerifyPipeIOEventHandler(PipeIOEventHandlerBase):
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def __init__(self, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
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self.auth_key = KeyManager().auth_key
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super().__init__(None, in_pipe_path, out_pipe_path, permissions)
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def handle_event(self, message):
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return
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def handle_pipe_event(self, message_bytes):
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message = loads(message_bytes)
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validity = verify_message(self.auth_key, message)
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self.pipe_io.send_message(str(validity).lower().encode())
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@ -5,12 +5,85 @@ from tornado.ioloop import IOLoop
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from tfw import EventHandlerBase
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from tfw.components import PipeIOEventHandler
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from pipe_io_auxlib import (
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MsgSignPipeIOEventHandler, MsgVerifyPipeIOEventHandler,
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DeployPipeIOEventHandler, IdePipeIOEventHandler,
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FSMPipeIOEventHandler
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)
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if __name__ == '__main__':
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pipe_io = PipeIOEventHandler(
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'''
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Creates general purpose pipes.
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You can send/receive JSON messages to/from the TFW server as any user.
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'''
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json_pipe = PipeIOEventHandler(
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'',
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'/tmp/tfw_send',
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'/tmp/tfw_recv'
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'/tmp/tfw_json_send',
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'/tmp/tfw_json_recv',
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permissions=0o666
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)
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'''
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Signs a valid TFW message with HMAC.
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Note that this process needs root permissions in order to read the
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authentication key.
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When forwarding is true, it will send the signed message to the TFW
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server before writing it into the output pipe.
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'''
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sign_pipe = MsgSignPipeIOEventHandler(
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'/tmp/tfw_sign_send',
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'/tmp/tfw_sign_recv',
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forwarding=True
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)
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'''
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Verifies a signed TFW message.
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This pipe also needs root permissions. Send the serialized JSON object
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to the pipe, then wait for its boolean response.
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'''
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verify_pipe = MsgVerifyPipeIOEventHandler(
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'/tmp/tfw_verify_send',
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'/tmp/tfw_verify_recv'
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)
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'''
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Manages deployment in the IDE.
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When you receive "deploy", then you have to answer with a "true" or
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"false" depending whether you are satisfied with the result or not.
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The third parameter is the name of the supervised service.
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'''
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deploy_pipe = DeployPipeIOEventHandler(
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'/tmp/tfw_deploy_send',
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'/tmp/tfw_deploy_recv',
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'webservice'
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)
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'''
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Manipulates the content of the IDE.
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You can observe a file, and when the user edits it, you will receive
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the new contents where newlines are escaped as "\\n".
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In order to overwrite the file, send an escaped text back to the pipe.
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Since the pipe doesn't know if the file is selected initially in the IDE,
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you have to provide this information by yourself, but it will track it
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later on.
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'''
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ide_pipe = IdePipeIOEventHandler(
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'/tmp/tfw_ide_send',
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'/tmp/tfw_ide_recv',
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'user_ops.py',
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selected=True
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)
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'''
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Handles FSM steps.
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When the FSM enters the next state, you will receive a line containing
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its name.
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To trigger a state change, send the name of the transition to the pipe.
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'''
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fsm_pipe = FSMPipeIOEventHandler(
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'/tmp/tfw_fsm_send',
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'/tmp/tfw_fsm_recv'
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)
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event_handlers = EventHandlerBase.get_local_instances()
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