89 lines
3.1 KiB
Python
89 lines
3.1 KiB
Python
"""A process management system using mongodb/jasper.
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Serves as an alternative to process.py.
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"""
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from __future__ import absolute_import
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try:
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import grpc
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except ImportError:
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pass
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from . import process as _process
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class Process(_process.Process):
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"""Class for spawning a process using mongodb/jasper."""
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jasper_pb2 = None
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jasper_pb2_grpc = None
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connection_str = None
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def __init__(self, logger, args, env=None, env_vars=None):
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"""Initialize the process with the specified logger, arguments, and environment."""
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_process.Process.__init__(self, logger, args, env=env, env_vars=env_vars)
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self._id = None
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self._stub = self.jasper_pb2_grpc.JasperProcessManagerStub(
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grpc.insecure_channel(self.connection_str))
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self._return_code = None
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def start(self):
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"""Start the process and the logger pipes for its stdout and stderr."""
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log_type = self.jasper_pb2.LogType.Value("LOGINHERIT")
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log_format = self.jasper_pb2.LogFormat.Value("LOGFORMATPLAIN")
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log_options = self.jasper_pb2.LogOptions(format=log_format)
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logger = self.jasper_pb2.Logger(log_type=log_type, log_options=log_options)
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output_opts = self.jasper_pb2.OutputOptions(loggers=[logger])
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create_options = self.jasper_pb2.CreateOptions(
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args=self.args,
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environment=self.env,
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override_environ=True,
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timeout_seconds=0,
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output=output_opts,
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)
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val = self._stub.Create(create_options)
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self.pid = val.pid
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self._id = self.jasper_pb2.JasperProcessID(value=val.id)
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self._return_code = None
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def stop(self, kill=False):
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"""Terminate the process."""
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signal = self.jasper_pb2.Signals.Value("TERMINATE")
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if kill:
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signal = self.jasper_pb2.Signals.Value("KILL")
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signal_process = self.jasper_pb2.SignalProcess(ProcessID=self._id, signal=signal)
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try:
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val = self._stub.Signal(signal_process)
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if not val.success:
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raise OSError("Unable to stop process %d." % self.pid)
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except grpc.RpcError as err:
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err.details = err.details()
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if "cannot signal a process that has terminated" not in err.details \
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and "os: process already finished" not in err.details:
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raise
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def poll(self):
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"""Poll."""
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if self._return_code is None:
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process = self._stub.Get(self._id)
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if not process.running:
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self.wait()
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return self._return_code
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def wait(self):
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"""Wait until process has terminated and all output has been consumed by the logger pipes."""
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if self._return_code is None:
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try:
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wait = self._stub.Wait(self._id)
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self._return_code = wait.exit_code
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except grpc.RpcError as err:
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if "problem encountered while waiting: operation failed" not in err.details():
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raise
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wait = self._stub.Get(self._id)
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self._return_code = wait.exit_code
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return self._return_code
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