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import datetime
import time
from random import random
from threading import current_thread
import reactivex as rx
from reactivex import operators as ops, GroupedObservable
from reactivex.scheduler import ThreadPoolScheduler
from reactivex.subject import Subject
class _WriterKey(object):
def __init__(self, key):
self.key = key
def __hash__(self) -> int:
return hash((self.key, self.key))
def __eq__(self, o: object) -> bool:
return isinstance(o, self.__class__) and self.key == o.key and self.key == o.key
def __str__(self) -> str:
return 'key[\'{}\']'.format(self.key)
class _Notification(object):
def __init__(self, data, exception=None):
self.data = data
self.exception = exception
pass
def __str__(self) -> str:
return '_Notification[status:\'{}\', \'{}\']' \
.format("failed" if self.exception else "success", self.data)
class _RxWriter(object):
success_count = 0
failed_count = 0
raise_retry_exception = 0
def __init__(self) -> None:
self._subject = Subject()
self._scheduler = ThreadPoolScheduler(max_workers=1)
obs = self._subject.pipe(ops.observe_on(self._scheduler))
self._disposable = obs \
.pipe(ops.window_with_time_or_count(count=5, timespan=datetime.timedelta(milliseconds=10_000)),
ops.flat_map(lambda x: self._window_to_group(x)),
ops.map(mapper=lambda x: self._retryable(data=x, delay=self._jitter_delay(jitter_interval=1000))),
ops.merge_all()) \
.subscribe(self._result, self._error, self._on_complete)
pass
def close(self):
self.__del__()
def __del__(self):
if self._subject:
self._subject.on_completed()
self._subject.dispose()
self._subject = None
while not self._disposable.is_disposed:
time.sleep(0.1)
if self._disposable:
self._disposable = None
pass
def _window_to_group(self, value):
return value.pipe(
ops.to_iterable(),
ops.map(lambda x: rx.from_iterable(x).pipe(
ops.group_by(_group_by), ops.map(_group_to_batch), ops.merge_all())),
ops.merge_all())
def _retryable(self, data: str, delay: datetime.timedelta):
return rx.of(data).pipe(
ops.delay(duetime=delay, scheduler=self._scheduler),
ops.map(lambda x: self._http(x)),
ops.catch(handler=lambda exception, source: self._retry_handler(exception, source, data)),
)
def _http(self, data: str):
if "gamma" in data:
print('bad request[{}]: {}'.format(current_thread().name, data))
raise Exception('unexpected token: {}'.format(data))
pass
if "alpha" in data:
if self.raise_retry_exception < 2:
self.raise_retry_exception += 1
print('server is temporarily unavailable to accept writes[{}]: {}'.format(current_thread().name, data))
raise Exception('server is temporarily unavailable to accept writes: {}'.format(data))
else:
print("server is OK: {}".format(datetime.datetime.now()))
pass
print("http[" + current_thread().name + "]: " + data)
return _Notification(data=data)
def write(self, data: str):
print("write[" + current_thread().name + "]")
self._subject.on_next(data)
pass
def _result(self, data: _Notification):
print("result[" + current_thread().name + "]: " + str(data))
if data.exception:
self.failed_count += 1
else:
self.success_count += 1
pass
def _error(self, error):
print(error)
def _on_complete(self):
self._disposable.dispose()
print("on complete")
def _jitter_delay(self, jitter_interval=0):
_jitter = datetime.timedelta(milliseconds=random() * jitter_interval)
print('jitter: {}'.format(_jitter))
return _jitter
def _retry_handler(self, exception, source, data):
print('retry_handler: {}, source: {}'.format(exception, source))
if "server is temporarily" in str(exception):
print("RETRY!!!: {}".format(datetime.datetime.now()))
return self._retryable(data, delay=datetime.timedelta(seconds=2))
notification = _Notification(exception=exception, data=data)
return rx.just(notification)
def _create_batch(group: GroupedObservable):
return lambda xs: '{}: {}'.format(str(group.key), ', '.join(xs))
def _group_by(v):
# print("_group_by[" + current_thread().name + "]")
return _WriterKey(v[0])
def _group_to_batch(group: GroupedObservable):
return group.pipe(ops.to_iterable(),
ops.map(list),
ops.map(_create_batch(group)))
rxWriter = _RxWriter()
print("\n== init[" + current_thread().name + "] ==\n")
rxWriter.write("alpha")
rxWriter.write("beta")
rxWriter.write("brick")
rxWriter.write("racket")
rxWriter.write("bat")
rxWriter.write("apple")
rxWriter.write("gamma")
time.sleep(2)
rxWriter.write("apricot")
rxWriter.write("root")
rxWriter.write("delta")
rxWriter.write("double")
rxWriter.write("backpack")
rxWriter.write("giant")
rxWriter.write("balloon")
print("\n== finish writing ==\n")
time.sleep(5)
print("\n== close ==\n")
rxWriter.close()
print("\n== finished ==\n")
print('success: {}, failed: {}'.format(rxWriter.success_count, rxWriter.failed_count))
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