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_celery_runner.py
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_celery_runner.py
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from __future__ import print_function
from __future__ import absolute_import
from celery import Celery
from time import sleep
import redis
import os
# This can be changed via environment variable `REDIS`
REDIS_URL = 'redis://localhost:6379/0'
def mk_celery_app(addr=None):
if addr is None:
url = os.environ.get('REDIS', REDIS_URL)
else:
url = 'redis://{}:{}/0'.format(*addr)
_app = Celery('datacube_task', broker=url, backend=url)
_app.conf.update(
task_serializer='pickle',
result_serializer='pickle',
accept_content=['pickle'])
return _app
# Celery worker launch script expects to see app object at the top level
# pylint: disable=invalid-name
app = mk_celery_app()
def set_address(host, port=6379, db=0, password=None):
if password is None:
url = 'redis://{}:{}/{}'.format(host, port, db)
else:
url = 'redis://:{}@{}:{}/{}'.format(password, host, port, db)
app.conf.update(result_backend=url,
broker_url=url)
@app.task()
def run_cloud_pickled_function(f_data, *args, **kwargs):
from cloudpickle import loads
func = loads(f_data)
return func(*args, **kwargs)
def submit_cloud_pickled_function(f, *args, **kwargs):
from cloudpickle import dumps
f_data = dumps(f)
return run_cloud_pickled_function.delay(f_data, *args, **kwargs)
def launch_worker(host, port=6379, password=None, nprocs=None):
if password == '':
password = get_redis_password(generate_if_missing=False)
set_address(host, port, password=password)
argv = ['worker', '-A', 'datacube._celery_runner']
if nprocs is not None:
argv.extend(['-c', str(nprocs)])
app.worker_main(argv)
def get_redis_password(generate_if_missing=False):
from .utils import write_user_secret_file, slurp, gen_password
REDIS_PASSWORD_FILE = '.datacube-redis'
password = slurp(REDIS_PASSWORD_FILE, in_home_dir=True)
if password is not None:
return password
if generate_if_missing:
password = gen_password(12)
write_user_secret_file(password, REDIS_PASSWORD_FILE, in_home_dir=True)
return password
class CeleryExecutor(object):
def __init__(self, host=None, port=None, password=None):
# print('Celery: {}:{}'.format(host, port))
self._shutdown = None
if port or host or password:
if password == '':
password = get_redis_password(generate_if_missing=True)
set_address(host if host else 'localhost',
port if port else 6379,
password=password)
host = host if host else 'localhost'
port = port if port else 6379
if not check_redis(host, port, password):
if host in ['localhost', '127.0.0.1']:
self._shutdown = launch_redis(port if port else 6379, password=password)
else:
raise IOError("Can't connect to redis server @ {}:{}".format(host, port))
def __del__(self):
if self._shutdown:
app.control.shutdown()
sleep(1)
self._shutdown()
def __repr__(self):
return 'CeleryRunner'
def submit(self, func, *args, **kwargs):
return submit_cloud_pickled_function(func, *args, **kwargs)
def map(self, func, iterable):
return [self.submit(func, data) for data in iterable]
@staticmethod
def get_ready(futures):
completed = []
failed = []
pending = []
for f in futures:
if f.ready():
if f.failed():
failed.append(f)
else:
completed.append(f)
else:
pending.append(f)
return completed, failed, pending
@staticmethod
def as_completed(futures):
while len(futures) > 0:
pending = []
for promise in futures:
if promise.ready():
yield promise
else:
pending.append(promise)
if len(pending) == len(futures):
# If no change detected sleep for a bit
# TODO: this is sub-optimal, not sure what other options are
# though?
sleep(0.1)
futures = pending
@classmethod
def next_completed(cls, futures, default):
results = list(futures)
if not results:
return default, results
result = next(cls.as_completed(results), default)
results.remove(result)
return result, results
@staticmethod
def results(futures):
return [future.get() for future in futures]
@staticmethod
def result(future):
return future.get()
@staticmethod
def release(future):
future.forget()
def check_redis(host='localhost', port=6379, password=None):
if password == '':
password = get_redis_password()
server = redis.Redis(host, port, password=password)
try:
server.ping()
except redis.exceptions.ConnectionError:
return False
except redis.exceptions.ResponseError as error:
print('Redis responded with an error: {}'.format(error))
return False
return True
def launch_redis(port=6379, password=None, **kwargs):
import tempfile
from os import path
import subprocess
import shutil
from .utils import write_user_secret_file
def stringify(v):
if isinstance(v, str):
return '"'+v+'"' if v.find(' ') >= 0 else v
if isinstance(v, bool):
return {True: 'yes', False: 'no'}[v]
return str(v)
def fix_key(k):
return k.replace('_', '-')
def write_config(params, cfgfile):
lines = ['{} {}'.format(fix_key(k), stringify(v)) for k, v in params.items()]
cfg_txt = '\n'.join(lines)
write_user_secret_file(cfg_txt, cfgfile)
workdir = tempfile.mkdtemp(prefix='redis-')
defaults = dict(maxmemory_policy='noeviction',
daemonize=True,
port=port,
databases=4,
maxmemory="100mb",
hz=50,
loglevel='notice',
pidfile=path.join(workdir, 'redis.pid'),
logfile=path.join(workdir, 'redis.log'))
if password is not None:
if password == '':
password = get_redis_password(generate_if_missing=True)
defaults['requirepass'] = password
else:
password = defaults.get('requirepass', None)
defaults.update(kwargs)
cfgfile = path.join(workdir, 'redis.cfg')
write_config(defaults, cfgfile)
def cleanup():
shutil.rmtree(workdir)
def shutdown():
server = redis.Redis('localhost', port, password=password)
server.shutdown()
sleep(1)
cleanup()
try:
subprocess.check_call(['redis-server', cfgfile])
except subprocess.CalledProcessError:
cleanup()
return False
return shutdown