mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-09-19 03:04:10 +00:00
88 lines
2.7 KiB
Python
88 lines
2.7 KiB
Python
from abc import abstractmethod
|
|
from json import loads, dumps
|
|
from subprocess import run, PIPE
|
|
from functools import partial
|
|
|
|
from tfw import EventHandlerBase
|
|
from tfw.config.logs import logging
|
|
|
|
from .pipe_io_server import PipeIOServer
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
DEFAULT_PERMISSIONS = 0o600
|
|
|
|
|
|
class PipeIOEventHandlerBase(EventHandlerBase):
|
|
def __init__(self, key, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
|
|
super().__init__(key)
|
|
self.pipe_io = CallbackPipeIOServer(
|
|
in_pipe_path,
|
|
out_pipe_path,
|
|
self.handle_pipe_event,
|
|
permissions
|
|
)
|
|
self.pipe_io.start()
|
|
|
|
@abstractmethod
|
|
def handle_pipe_event(self, message_bytes):
|
|
raise NotImplementedError()
|
|
|
|
def cleanup(self):
|
|
self.pipe_io.stop()
|
|
|
|
|
|
class CallbackPipeIOServer(PipeIOServer):
|
|
def __init__(self, in_pipe_path, out_pipe_path, callback, permissions):
|
|
super().__init__(in_pipe_path, out_pipe_path, permissions)
|
|
self.callback = callback
|
|
|
|
def handle_message(self, message):
|
|
self.callback(message)
|
|
|
|
|
|
class PipeIOEventHandler(PipeIOEventHandlerBase):
|
|
def handle_event(self, message):
|
|
json_bytes = dumps(message).encode()
|
|
self.pipe_io.send_message(json_bytes)
|
|
|
|
def handle_pipe_event(self, message_bytes):
|
|
json = loads(message_bytes)
|
|
self.server_connector.send(json)
|
|
|
|
|
|
class TransformerPipeIOEventHandler(PipeIOEventHandlerBase):
|
|
# pylint: disable=too-many-arguments
|
|
def __init__(
|
|
self, key, in_pipe_path, out_pipe_path,
|
|
transform_in_cmd, transform_out_cmd,
|
|
permissions=DEFAULT_PERMISSIONS
|
|
):
|
|
self._transform_in = partial(self._transform_message, transform_in_cmd)
|
|
self._transform_out = partial(self._transform_message, transform_out_cmd)
|
|
super().__init__(key, in_pipe_path, out_pipe_path, permissions)
|
|
|
|
@staticmethod
|
|
def _transform_message(transform_cmd, message):
|
|
proc = run(
|
|
transform_cmd,
|
|
input=message,
|
|
stdout=PIPE,
|
|
stderr=PIPE,
|
|
shell=True
|
|
)
|
|
if proc.returncode == 0:
|
|
return proc.stdout
|
|
raise ValueError(f'Transforming message {message} failed!')
|
|
|
|
def handle_event(self, message):
|
|
json_bytes = dumps(message).encode()
|
|
transformed_bytes = self._transform_out(json_bytes)
|
|
if transformed_bytes:
|
|
self.pipe_io.send_message(transformed_bytes)
|
|
|
|
def handle_pipe_event(self, message_bytes):
|
|
transformed_bytes = self._transform_in(message_bytes)
|
|
if transformed_bytes:
|
|
json_message = loads(transformed_bytes)
|
|
self.server_connector.send(json_message)
|