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runScheduler.py
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runScheduler.py
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#!flask/bin/python
import sys
import traceback
import datetime
import time
from pytz import reference
import pytz
import sqlalchemy.exc
from apscheduler.schedulers.blocking import BlockingScheduler
from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.executors.pool import ProcessPoolExecutor
from apscheduler.executors.pool import ThreadPoolExecutor
from apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStore
import config
import WebMirror.database as db
import WebMirror.LogBase as LogBase
if __name__ == "__main__":
import logSetup
logSetup.initLogging()
from WebMirror.Runner import NO_PROCESSES
from settings import MAX_DB_SESSIONS
import activePlugins
SQLALCHEMY_DATABASE_URI = 'postgresql://{user}:{passwd}@{host}:5432/{database}'.format(user=config.C_DATABASE_USER, passwd=config.C_DATABASE_PASS, host=config.C_DATABASE_IP, database=config.C_DATABASE_DB_NAME)
CALLABLE_LUT = {}
for item, dummy_interval in activePlugins.scrapePlugins.values():
print("Plugin: ", item.__name__)
assert item.__name__ not in CALLABLE_LUT, "Plugin appears twice in call lookup table (%s)?" % item.__name__
CALLABLE_LUT[item.__name__] = item
class JobNameException(Exception):
pass
class JobCaller(LogBase.LoggerMixin):
loggerPath = "Main.PluginRunner"
def __init__(self, job_name):
if not job_name in CALLABLE_LUT:
raise JobNameException("Callable '%s' is not in the class lookup table: '%s'!" % (job_name, CALLABLE_LUT))
self.runModule = CALLABLE_LUT[job_name]
self.job_name = job_name
session = db.get_db_session()
try:
query = session.query(db.PluginStatus).filter(db.PluginStatus.plugin_name==job_name)
have = query.scalar()
if not have:
new = db.PluginStatus(plugin_name=job_name)
session.add(new)
session.commit()
except sqlalchemy.exc.OperationalError:
session.rollback()
except sqlalchemy.exc.InvalidRequestError:
session.rollback()
finally:
db.delete_db_session()
def doCall(self):
self.log.info("Calling job %s", self.job_name)
session = db.get_db_session()
item = session.query(db.PluginStatus).filter(db.PluginStatus.plugin_name==self.job_name).one()
if item.is_running:
session.commit()
self.log.error("Plugin %s is already running! Not doing re-entrant call!", self.job_name)
return
item.is_running = True
item.last_run = datetime.datetime.now()
session.commit()
try:
self._doCall()
except Exception:
item.last_error = datetime.datetime.now()
item.last_error_msg = traceback.format_exc()
raise
finally:
item2 = session.query(db.PluginStatus).filter(db.PluginStatus.plugin_name==self.job_name).one()
item2.is_running = False
item2.last_run_end = datetime.datetime.now()
session.commit()
db.delete_db_session()
self.log.info("Job %s complete.", self.job_name)
# Should probably be a lambda? Laaaazy.
def _doCall(self):
instance = self.runModule()
instance._go()
@classmethod
def callMod(cls, passMod):
mod = cls(passMod)
mod.doCall()
def do_call(job_name):
caller = JobCaller(job_name)
while 1:
try:
caller.doCall()
break
except JobNameException:
print("Error! Invalid job name: '%s'!" % job_name)
break
except AttributeError:
traceback.print_exc()
print("Call error!")
def scheduleJobs(sched, timeToStart):
jobs = []
offset = 0
for key, value in activePlugins.scrapePlugins.items():
baseModule, interval = value
jobs.append((key, baseModule, interval, timeToStart+datetime.timedelta(seconds=60*offset)))
offset += 1
activeJobs = []
print("JobCaller: ", JobCaller)
print("JobCaller.callMod: ", JobCaller.callMod)
for jobId, callee, interval, startWhen in jobs:
jId = callee.__name__
activeJobs.append(jId)
if sched.get_job(jId):
print("JobID %s already scheduled." % jId)
else:
print("Need to add new job for ID: ", jId)
sched.add_job(do_call,
args = (callee.__name__, ),
trigger = 'interval',
# jobstore = 'sqlalchemy',
seconds = interval,
next_run_time = startWhen,
id = jId,
replace_existing = True,
max_instances = 1,
coalesce = True,
misfire_grace_time = 2**30)
for job in sched.get_jobs('main_jobstore'):
if not job.id in activeJobs:
print("Extra job in jobstore: %s. Removing." % job.id)
sched.remove_job(job.id, 'main_jobstore')
def resetRunStates():
print("JobSetup call resetting run-states!")
session = db.get_db_session()
session.query(db.PluginStatus).update({db.PluginStatus.is_running : False})
session.commit()
db.delete_db_session()
print("Run-states reset.")
def dump_scheduled_jobs(sched):
print("Scheduled jobs:")
existing = sched.get_jobs()
if not existing:
print(" No jobs in scheduler!")
tznow = datetime.datetime.now(tz=pytz.utc)
for job in existing:
print(" ", job, job.args, "running in:", job.next_run_time - tznow)
# session = db.get_db_session()
# items = session.query(db.PluginStatus).all()
# print("Jobs in DB:")
# for item in items:
# print(" ", item)
# db.delete_db_session()
def go_sched():
resetRunStates()
sched = BackgroundScheduler({
'apscheduler.jobstores.default': {
'type': 'sqlalchemy',
'url': SQLALCHEMY_DATABASE_URI
},
'apscheduler.executors.default': {
'class': 'apscheduler.executors.pool:ProcessPoolExecutor',
'max_workers': '10'
},
'apscheduler.job_defaults.coalesce': 'true',
'apscheduler.job_defaults.max_instances': '5',
})
# Apparently the scheduler pull the jobs from the backend until you start it,
# so if you're trying to validate the jobs already present, you have to start it
# before iterating over jobs in the jobstore.
sched.start()
print("Jobs in scheduler:")
dump_scheduled_jobs(sched)
startTime = datetime.datetime.now(tz=pytz.utc)+datetime.timedelta(seconds=10)
scheduleJobs(sched, startTime)
dump_scheduled_jobs(sched)
print("Starting scheduler.")
while 1:
try:
dump_scheduled_jobs(sched)
time.sleep(30)
except KeyboardInterrupt:
break
sched.shutdown()
if __name__ == "__main__":
print("Auxilliary modes: 'test', 'scheduler'.")
largv = [tmp.lower() for tmp in sys.argv]
global NO_PROCESSES
global MAX_DB_SESSIONS
MAX_DB_SESSIONS = NO_PROCESSES + 5
MAX_DB_SESSIONS = 4
go_sched()