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from __future__ import absolute_import
import errno
import json
from threading import Thread
from cachecontrol import CacheControl
from ldclient.util import log
from ldclient.interfaces import FeatureRequester, StreamProcessor, EventConsumer
from ldclient.util import _headers, _stream_headers
import requests
from requests.packages.urllib3.exceptions import ProtocolError
from sseclient import SSEClient
class RequestsFeatureRequester(FeatureRequester):
def __init__(self, api_key, config):
self._api_key = api_key
self._session = CacheControl(requests.Session())
self._config = config
def get(self, key, callback):
# return callback(do_toggle(key))
def do_toggle(should_retry):
# noinspection PyBroadException,PyUnresolvedReferences
try:
val = self._toggle(key)
return val
except ProtocolError as e:
inner = e.args[1]
if inner.errno == errno.ECONNRESET and should_retry:
log.warning(
'ProtocolError exception caught while getting flag. Retrying.')
return do_toggle(False)
else:
log.exception(
'Unhandled exception. Returning default value for flag.')
return None
except Exception:
log.exception(
'Unhandled exception. Returning default value for flag.')
return None
return callback(do_toggle(True))
def _toggle(self, key):
hdrs = _headers(self._api_key)
uri = self._config.base_uri + '/api/eval/features/' + key
r = self._session.get(uri, headers=hdrs, timeout=(
self._config.connect, self._config.read))
r.raise_for_status()
feature = r.json()
return feature
class RequestsStreamProcessor(Thread, StreamProcessor):
def __init__(self, api_key, config, store):
Thread.__init__(self)
self.daemon = True
self._api_key = api_key
self._config = config
self._store = store
self._running = False
def run(self):
log.debug("Starting stream processor")
self._running = True
hdrs = _stream_headers(self._api_key)
uri = self._config.stream_uri + "/"
messages = SSEClient(uri, verify=self._config.verify, headers=hdrs)
for msg in messages:
if not self._running:
break
self.process_message(self._store, msg)
def stop(self):
self._running = False
@staticmethod
def process_message(store, msg):
payload = json.loads(msg.data)
if msg.event == 'put':
store.init(payload)
elif msg.event == 'patch':
key = payload['path'][1:]
feature = payload['data']
store.upsert(key, feature)
elif msg.event == 'delete':
key = payload['path'][1:]
# noinspection PyShadowingNames
version = payload['version']
store.delete(key, version)
else:
log.warning('Unhandled event in stream processor: ' + msg.event)
class RequestsEventConsumer(Thread, EventConsumer):
def __init__(self, event_queue, api_key, config):
Thread.__init__(self)
self._session = requests.Session()
self.daemon = True
self._api_key = api_key
self._config = config
self._queue = event_queue
self._running = False
def run(self):
log.debug("Starting event consumer")
self._running = True
while self._running:
self.send()
def stop(self):
self._running = False
def flush(self):
self._queue.join()
def send_batch(self, events):
def do_send(should_retry):
# noinspection PyBroadException
try:
if isinstance(events, dict):
body = [events]
else:
body = events
hdrs = _headers(self._api_key)
uri = self._config.events_uri + '/bulk'
r = self._session.post(uri, headers=hdrs, timeout=(self._config.connect, self._config.read),
data=json.dumps(body))
r.raise_for_status()
except ProtocolError as e:
inner = e.args[1]
if inner.errno == errno.ECONNRESET and should_retry:
log.warning(
'ProtocolError exception caught while sending events. Retrying.')
do_send(False)
else:
log.exception(
'Unhandled exception in event consumer. Analytics events were not processed.')
except:
log.exception(
'Unhandled exception in event consumer. Analytics events were not processed.')
try:
do_send(True)
finally:
for _ in events:
self._queue.task_done()
def send(self):
events = self.next()
if len(events) == 0:
return
else:
self.send_batch(events)
def next(self):
q = self._queue
items = []
item = self.next_item()
if item is None:
return items
items.append(item)
while len(items) < self._config.upload_limit and not q.empty():
item = self.next_item()
if item:
items.append(item)
return items
def next_item(self):
q = self._queue
# noinspection PyBroadException
try:
item = q.get(block=True, timeout=5)
return item
except Exception:
return None