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from __future__ import division, with_statement, absolute_import
from builtins import object
import time
from ldclient.interfaces import FeatureStore
from ldclient.requests import RequestsStreamProcessor, RequestsEventConsumer, RequestsFeatureRequester
from ldclient.util import check_uwsgi, _evaluate, log
import requests
# noinspection PyBroadException
try:
import queue
except:
# noinspection PyUnresolvedReferences,PyPep8Naming
import Queue as queue
from cachecontrol import CacheControl
from threading import Lock
from ldclient.rwlock import ReadWriteLock
class Config(object):
def __init__(self,
base_uri='https://app.launchdarkly.com',
events_uri='https://events.launchdarkly.com',
connect_timeout=2,
read_timeout=10,
upload_limit=100,
capacity=10000,
stream_uri='https://stream.launchdarkly.com',
stream=True,
verify=True,
defaults=None,
events=True,
stream_processor_class=None,
feature_store_class=None,
feature_requester_class=None,
consumer_class=None):
"""
:param stream_processor_class: A factory for a StreamProcessor implementation taking the api key, config,
and FeatureStore implementation
:type stream_processor_class: (str, Config, FeatureStore) -> StreamProcessor
:param feature_store_class: A factory for a FeatureStore implementation
:type feature_store_class: () -> FeatureStore
:param feature_requester_class: A factory for a FeatureRequester implementation taking the api key and config
:type feature_requester_class: (str, Config) -> FeatureRequester
:param consumer_class: A factory for an EventConsumer implementation taking the event queue, api key, and config
:type consumer_class: (queue.Queue, str, Config) -> EventConsumer
"""
if defaults is None:
defaults = {}
self.base_uri = base_uri.rstrip('\\')
self.events_uri = events_uri.rstrip('\\')
self.stream_uri = stream_uri.rstrip('\\')
self.stream = stream
self.stream_processor_class = RequestsStreamProcessor if not stream_processor_class else stream_processor_class
self.feature_store_class = InMemoryFeatureStore if not feature_store_class else feature_store_class
self.consumer_class = RequestsEventConsumer if not consumer_class else consumer_class
self.feature_requester_class = RequestsFeatureRequester if not feature_requester_class else \
feature_requester_class
self.connect = connect_timeout
self.read = read_timeout
self.upload_limit = upload_limit
self.capacity = capacity
self.verify = verify
self.defaults = defaults
self.events = events
def get_default(self, key, default):
return default if key not in self.defaults else self.defaults[key]
@classmethod
def default(cls):
return cls()
class InMemoryFeatureStore(FeatureStore):
def __init__(self):
self._lock = ReadWriteLock()
self._initialized = False
self._features = {}
def get(self, key):
try:
self._lock.rlock()
f = self._features.get(key)
if f is None or 'deleted' in f and f['deleted']:
return None
return f
finally:
self._lock.runlock()
def all(self):
try:
self._lock.rlock()
return dict((k, f) for k, f in self._features.items() if ('deleted' not in f) or not f['deleted'])
finally:
self._lock.runlock()
def init(self, features):
try:
self._lock.lock()
self._features = dict(features)
self._initialized = True
finally:
self._lock.unlock()
# noinspection PyShadowingNames
def delete(self, key, version):
try:
self._lock.lock()
f = self._features.get(key)
if f is not None and f['version'] < version:
f['deleted'] = True
f['version'] = version
elif f is None:
f = {'deleted': True, 'version': version}
self._features[key] = f
finally:
self._lock.unlock()
def upsert(self, key, feature):
try:
self._lock.lock()
f = self._features.get(key)
if f is None or f['version'] < feature['version']:
self._features[key] = f
finally:
self._lock.unlock()
@property
def initialized(self):
try:
self._lock.rlock()
return self._initialized
finally:
self._lock.runlock()
class LDClient(object):
def __init__(self, api_key, config=None):
check_uwsgi()
self._api_key = api_key
self._config = config or Config.default()
self._session = CacheControl(requests.Session())
self._queue = queue.Queue(self._config.capacity)
self._consumer = None
self._offline = False
self._lock = Lock()
self._store = self._config.feature_store_class()
""" :type: FeatureStore """
self._feature_requester = self._config.feature_requester_class(
api_key, self._config)
""" :type: FeatureRequester """
self._stream_processor = None
if self._config.stream:
self._stream_processor = self._config.stream_processor_class(
api_key, self._config, self._store)
self._stream_processor.start()
@property
def api_key(self):
return self._api_key
def _check_consumer(self):
with self._lock:
if not self._consumer or not self._consumer.is_alive():
self._consumer = self._config.consumer_class(
self._queue, self._api_key, self._config)
self._consumer.start()
def _stop_consumers(self):
if self._consumer and self._consumer.is_alive():
self._consumer.stop()
if self._stream_processor and self._stream_processor.is_alive():
self._stream_processor.stop()
def _send(self, event):
if self._offline or not self._config.events:
return
self._check_consumer()
event['creationDate'] = int(time.time() * 1000)
if self._queue.full():
log.warning("Event queue is full-- dropped an event")
else:
self._queue.put(event)
def track(self, event_name, user, data=None):
self._sanitize_user(user)
self._send({'kind': 'custom', 'key': event_name,
'user': user, 'data': data})
def identify(self, user):
self._sanitize_user(user)
self._send({'kind': 'identify', 'key': user['key'], 'user': user})
def set_offline(self):
self._offline = True
self._stop_consumers()
def set_online(self):
self._offline = False
self._check_consumer()
def is_offline(self):
return self._offline
def flush(self):
if self._offline:
return
self._check_consumer()
return self._consumer.flush()
def get_flag(self, key, user, default=False):
return self.toggle(key, user, default)
def toggle(self, key, user, default=False):
self._sanitize_user(user)
default = self._config.get_default(key, default)
if self._offline:
return default
def cb(feature):
if feature is None:
val = default
else:
val = _evaluate(feature, user)
if val is None:
val = default
self._send({'kind': 'feature', 'key': key,
'user': user, 'value': val, 'default': default})
return val
if self._config.stream and self._store.initialized:
return cb(self._store.get(key))
else:
# noinspection PyBroadException
try:
return self._feature_requester.get(key, cb)
except Exception:
log.exception(
'Unhandled exception. Returning default value for flag.')
return cb(None)
def _sanitize_user(self, user):
if 'key' in user:
user['key'] = str(user['key'])
__all__ = ['LDClient', 'Config']