async def start_worker(self, index):
self.log.info('Start block loader worker %s' % index)
# prepare pipes for communications
in_reader, in_writer = os.pipe()
out_reader, out_writer = os.pipe()
in_reader, out_reader = os.fdopen(in_reader,
'rb'), os.fdopen(out_reader, 'rb')
in_writer, out_writer = os.fdopen(in_writer,
'wb'), os.fdopen(out_writer, 'wb')
# create new process
worker = Process(target=Worker,
args=(index, in_reader, in_writer, out_reader,
out_writer, self.rpc_url, self.rpc_timeout,
self.rpc_batch_limit, self.dsn,
self.parent.app_proc_title))
worker.start()
in_reader.close()
out_writer.close()
# get stream reader
worker.reader = await self.get_pipe_reader(out_reader)
worker.writer = await self.get_pipe_writer(in_writer)
worker.name = str(index)
self.worker[index] = worker
self.worker_busy[index] = False
# start message loop
self.loop.create_task(self.message_loop(index))
# wait if process crash
await self.loop.run_in_executor(None, worker.join)
del self.worker[index]
self.log.info('Block loader worker %s is stopped' % index)
