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job.py
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job.py
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import datetime as dt
import logging.config
from datetime import datetime
from queue import Queue
from threading import Timer
from typing import Callable, Union
import yaml
from enums import JobStatus
from tools import JobException, KThread, result_decorator
with open('logging_config.yaml', 'r') as f:
config = yaml.safe_load(f.read())
logging.config.dictConfig(config)
logger = logging.getLogger(__name__)
ATTRIBUTE_OF_JOB_TO_FILE = [
'target',
'name',
'max_working_time',
'tries',
'args',
'kwargs',
'start_at',
'result_queue',
'dependencies',
'_status'
]
def name_gen():
n = 1
while True:
yield f'Job-{n}'
n += 1
NAME_GEN = name_gen()
class Job:
"""Job class for schedule."""
def __init__(
self,
target: Callable,
start_at: Union[str, datetime] = '',
max_working_time: int = 0,
args: tuple = tuple(),
kwargs: dict = {},
dependencies: list = [],
tries: int = 0,
):
"""
:param target: function for schedule
:param start_at: start time str(hh:mm) or datetime
:param max_working_time: max time for work in seconds
:param args: arguments for target function
:param kwargs: key arguments for target function
:param dependencies: list of functions-dependencies for target
:param tries: number of capable restarts for functions
"""
self.target = target
self.args = args
self.kwargs = kwargs
self.thread = None
self.tries = tries
self.start_at = self._count_start_datetime(start_at) if isinstance(start_at, str) else start_at
self.max_working_time = max_working_time
self.result_queue = Queue()
self.do_func = result_decorator(self.result_queue)(self.do_func)
self.name = next(NAME_GEN)
self._status = JobStatus.CREATED
self.dependencies = dependencies
self._timer = None
def __repr__(self) -> str:
return f'Job:{self.name}, status:{self._status}'
def set_name(self, name: str) -> None:
self.name = name
def set_result(self, result: str) -> None:
self.result_queue.put(result)
def set_dependencies(self, dependencies: list) -> None:
self.dependencies = dependencies
@staticmethod
def _count_start_datetime(start_at: str) -> datetime:
if start_at:
start = datetime.strptime(start_at, '%H:%M')
now = datetime.now()
hour, minute = start.hour, start.minute
start_time = now.replace(hour=hour, minute=minute)
if start_time < now:
return start_time + dt.timedelta(days=1)
return start_time
return datetime.now()
def do_func(self, *args, **kwargs):
return self.target(*args, **kwargs)
def _set_final_status(self) -> None:
result = self.result_queue.get()
if isinstance(result, JobException):
self.status = JobStatus.RAISED_EXCEPTION
logger.error(
f'exception "{result}" in {self.name}'
)
if self._timer:
self._timer.cancel()
else:
self.result_queue.put(result)
self.status = JobStatus.DONE
if self._timer:
self._timer.cancel()
def terminate_job(self) -> None:
if self.result_queue.empty() and self.thread.is_alive():
self.thread.kill()
self.status = JobStatus.TERMINATED
logger.info(
f'Status of job has changed : {self.name}, {self._status}'
)
else:
self._set_final_status()
def pause(self) -> None:
if not self.result_queue.empty() and not self.thread.is_alive():
self._set_final_status()
logger.info(
f'Stop running of {self.name}'
)
self.thread.kill()
@property
def status(self) -> JobStatus:
if self._status not in [
JobStatus.TERMINATED,
JobStatus.DONE,
JobStatus.RAISED_EXCEPTION
]:
if not self.thread:
return JobStatus.WAITING
elif not self.thread.is_alive():
self._set_final_status()
return self._status
@status.setter
def status(self, status: str) -> None:
self._status = status
def run_thread(self) -> None:
thread_object = KThread(
target=self.do_func,
args=self.args,
kwargs=self.kwargs
)
if self.max_working_time:
self._timer = Timer(self.max_working_time, self.terminate_job)
self._timer.start()
thread_object.start()
self.thread = thread_object
self.status = JobStatus.WORKING
logger.info(
f'Status of job has changed : {self.name}, {self._status}'
)
def restart(self) -> None:
self.tries -= 1
logger.info(
f'Restart of {self.name}'
)
if not self.result_queue.empty():
self.result_queue.get()
self.thread = None
self.run_thread()