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"Generic worker script that runs actual worker script"
import os
import sys
import shlex
import argparse
import traceback
import subprocess
from time import sleep
from tempfile import TemporaryDirectory
from redis import Redis
from qc_app import jobs
from qc_app.check_connections import check_redis
def parse_args():
"Parse the command-line arguments"
parser = argparse.ArgumentParser(
prog="worker", description = (
"Generic worker to launch and manage specific worker scripts"))
parser.add_argument(
"redisurl", default="redis:///", help="URL to the redis server")
parser.add_argument("job_id", help="The id of the job being processed")
args = parser.parse_args()
check_redis(args.redisurl)
return args
def update_stdout_stderr(bytes_read, stream: str, rconn, job_id):
"Update the stdout/stderr keys according to the value of `stream`."
job = jobs.job(rconn, job_id)
contents = job.get(stream, '')
new_contents = contents + bytes_read.decode("utf-8")
rconn.hset(name=job_id, key=stream, value=new_contents)
def run_job(job, rconn):
"Run the actual job."
job_id = job["job_id"]
try:
with TemporaryDirectory() as tmpdir:
stderrpath = f"{tmpdir}/{job_id}.stderr"
with open(stderrpath, "w+b") as tmpfl:
with subprocess.Popen(
shlex.split(job["command"]), stdout=subprocess.PIPE,
stderr=tmpfl) as process:
while process.poll() is None:
update_stdout_stderr(
process.stdout.read1(), "stdout", rconn, job_id)
sleep(1)
with open(stderrpath, "rb") as stderr:
update_stdout_stderr(stderr.read(), "stderr", rconn, job_id)
os.remove(stderrpath)
return process.poll()
except Exception as exc:# pylint: disable=[broad-except,unused-variable]
update_stdout_stderr(
traceback.format_exc().encode("utf-8"), "stderr", rconn, job_id)
print(traceback.format_exc(), file=sys.stderr)
sys.exit(4)
def main():
"Entry point function"
args = parse_args()
with Redis.from_url(args.redisurl, decode_responses=True) as rconn:
job = jobs.job(rconn, args.job_id)
if job:
return run_job(job, rconn)
print(f"No such job. '{args.job_id}'.", file=sys.stderr)
return 2
return 3
if __name__ == "__main__":
sys.exit(main())
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