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add rudimentary master/controller/client

This commit is contained in:
Sebastien Bourdeauducq 2014-10-05 16:25:31 +08:00
parent 2f58cf6aff
commit 59194176a9
5 changed files with 244 additions and 0 deletions

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import asyncio
from artiq.management.worker import Worker
class Scheduler:
def __init__(self, loop):
self.loop = loop
self.queue = asyncio.Queue()
def __enter__(self):
self.worker = Worker(self.loop)
return self
def __exit__(self, type, value, traceback):
self.loop.run_until_complete(self.worker.end_process())
del self.worker
def add_run_once(self, item, timeout):
yield from self.queue.put((item, timeout))
def task(self):
while True:
item, timeout = yield from self.queue.get()
result = yield from self.worker.run(item, timeout)
print(result)

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import sys
import asyncio
import subprocess
import signal
import json
class WorkerFailed(Exception):
pass
class Worker:
def __init__(self, loop, send_timeout=0.5, start_reply_timeout=1.0,
term_timeout=1.0):
self.send_timeout = send_timeout
self.start_reply_timeout = start_reply_timeout
self.term_timeout = term_timeout
loop.run_until_complete(self.create_process())
@asyncio.coroutine
def create_process(self):
self.process = yield from asyncio.create_subprocess_exec(
sys.executable, "-m", "artiq.management.worker_impl",
stdout=subprocess.PIPE, stdin=subprocess.PIPE)
@asyncio.coroutine
def _send(self, obj, timeout):
line = json.dumps(obj)
self.process.stdin.write(line.encode())
self.process.stdin.write("\n".encode())
try:
fut = self.process.stdin.drain()
if fut is not (): # FIXME: why does Python return this?
yield from asyncio.wait_for(fut, timeout=timeout)
except asyncio.TimeoutError:
raise WorkerFailed("Timeout sending data from worker")
except:
raise WorkerFailed("Failed to send data to worker")
@asyncio.coroutine
def _recv(self, timeout):
try:
line = yield from asyncio.wait_for(
self.process.stdout.readline(), timeout=timeout)
except asyncio.TimeoutError:
raise WorkerFailed("Timeout receiving data from worker")
if not line:
raise WorkerFailed(
"Worker ended unexpectedly while trying to receive data")
try:
obj = json.loads(line.decode())
except:
raise WorkerFailed("Worker sent invalid JSON data")
return obj
@asyncio.coroutine
def run(self, run_params, result_timeout):
yield from self._send(run_params, self.send_timeout)
obj = yield from self._recv(self.start_reply_timeout)
if obj != "ack":
raise WorkerFailed("Incorrect acknowledgement")
result = yield from self._recv(result_timeout)
return result
@asyncio.coroutine
def end_process(self):
if self.process.returncode is not None:
return
self.process.send_signal(signal.SIGTERM)
try:
yield from asyncio.wait_for(
self.process.wait(), timeout=self.term_timeout)
except asyncio.TimeoutError:
self.process.send_signal(signal.SIGKILL)

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import json
import sys
import importlib
def import_in_folder(path, name):
try:
del sys.modules[name] # force path search
except KeyError:
pass
loader = importlib.find_loader(name, [path])
if loader is None:
raise ImportError("Could not find loader")
return loader.load_module()
def run(path, name):
module = import_in_folder(path, name)
module.main()
def put_object(obj):
ds = json.dumps(obj)
sys.__stdout__.write(ds)
sys.__stdout__.write("\n")
sys.__stdout__.flush()
def main():
sys.stdout = sys.stderr
while True:
line = sys.__stdin__.readline()
obj = json.loads(line)
put_object("ack")
try:
run(**obj)
except Exception as e:
put_object({"status": "failed", "message": str(e)})
else:
put_object({"status": "ok"})
if __name__ == "__main__":
main()

45
frontend/artiq Executable file
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#!/usr/bin/env python3
import argparse
import socket
import json
def _get_args():
parser = argparse.ArgumentParser(description="ARTIQ client")
parser.add_argument(
"-o", "--run-once", default=[], nargs=3,
action="append",
help="run experiment once. arguments: <path> <name> <timeout>")
parser.add_argument(
"-q", "--quit-master", default=False,
action="store_true",
help="causes the master to quit")
return parser.parse_args()
def _send_obj(sock, obj):
line = json.dumps(obj) + "\n"
sock.sendall(line.encode())
def main():
args = _get_args()
with socket.create_connection(("::1", 8888)) as sock:
for path, name, timeout in args.run_once:
obj = {
"action": "run_once",
"run_params": {
"path": path,
"name": name
},
"timeout": timeout
}
_send_obj(sock, obj)
if args.quit_master:
obj = {"action": "quit"}
_send_obj(sock, obj)
if __name__ == "__main__":
main()

54
frontend/artiqd Executable file
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#!/usr/bin/env python3
import asyncio
import json
from artiq.management.scheduler import Scheduler
class Server:
def __init__(self, loop, scheduler):
self.scheduler = scheduler
self.terminate_notify = asyncio.Semaphore(0)
loop.run_until_complete(
asyncio.start_server(self.handle_connection, "::1", 8888))
@asyncio.coroutine
def handle_connection(self, reader, writer):
while True:
line = yield from reader.readline()
if not line:
writer.close()
return
obj = json.loads(line.decode())
action = obj["action"]
if action == "run_once":
yield from self.scheduler.add_run_once(obj["run_params"],
float(obj["timeout"]))
elif action == "quit":
self.terminate_notify.release()
else:
print("warning: unknown action " + action)
@asyncio.coroutine
def task(self, scheduler_task):
yield from self.terminate_notify.acquire()
scheduler_task.cancel()
def main():
loop = asyncio.get_event_loop()
try:
with Scheduler(loop) as scheduler:
server = Server(loop, scheduler)
scheduler_task = asyncio.Task(scheduler.task())
server_task = asyncio.Task(server.task(scheduler_task))
loop.run_until_complete(asyncio.wait([
scheduler_task,
server_task
]))
finally:
loop.close()
if __name__ == "__main__":
main()