Python redis.io() Examples
The following are 3
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Example #1
Source File: stats_collector.py From scrapy-cluster with MIT License | 5 votes |
def __init__(self, key='hyperloglog_counter', cycle_time=5, start_time=None, window=None, roll=False, keep_max=None): ''' A unique item counter. Accurate within 1%, max storage of 12k http://redis.io/topics/data-types-intro#hyperloglogs ''' ThreadedCounter.__init__(self, key=key, cycle_time=cycle_time, start_time=start_time, window=window, roll=roll, keep_max=keep_max)
Example #2
Source File: shadow.py From tscached with GNU General Public License v3.0 | 5 votes |
def become_leader(config, redis_client): """ tscached can be deployed on multiple servers. Only one of them should exert shadow load. We use RedLock (http://redis.io/topics/distlock) to achieve this. If we cannot acquire the shadow lock, fail fast. If our server (or this program) crashes, the leader key will expire and another server will take over eventually. RedLock is (debatably) imperfect, but that's okay with us: our worst case is that some work gets done twice - because we are using Redis as a cache and *not* as a datastore. We're using one of the standard Python clientlibs: https://github.com/glasslion/redlock This implementation assumes a single-master Redis cluster. :param config: dict representing the top-level tscached config :param redis_client: redis.StrictRedis :return: redlock.RedLock or False """ hostname = socket.gethostname() leader_expiration = config['shadow'].get('leader_expiration', 3600) * 1000 # ms expected deets = [redis_client] # no need to reinitialize a redis connection. try: lock = redlock.RedLock(SHADOW_LOCK_KEY, ttl=leader_expiration, connection_details=deets) if lock.acquire(): # mostly for debugging purposes redis_client.set(SHADOW_SERVER_KEY, hostname, px=leader_expiration) logging.info('Lock acquired; now held by %s' % hostname) return lock else: other_host = redis_client.get(SHADOW_SERVER_KEY) logging.info('Could not acquire lock; lock is held by %s' % other_host) return False except redis.exceptions.RedisError as e: logging.error('RedisError in acquire_leader: ' + e.message) return False except redlock.RedLockError as e: logging.error('RedLockError in acquire_leader: ' + e.message) return False
Example #3
Source File: textindex.py From cloud-vision with Apache License 2.0 | 4 votes |
def detect_text(self, input_filenames, num_retries=3, max_results=6): """Uses the Vision API to detect text in the given file. """ images = {} for filename in input_filenames: with open(filename, 'rb') as image_file: images[filename] = image_file.read() batch_request = [] for filename in images: batch_request.append({ 'image': { 'content': base64.b64encode( images[filename]).decode('UTF-8') }, 'features': [{ 'type': 'TEXT_DETECTION', 'maxResults': max_results, }] }) request = self.service.images().annotate( body={'requests': batch_request}) try: responses = request.execute(num_retries=num_retries) if 'responses' not in responses: return {} text_response = {} for filename, response in zip(images, responses['responses']): if 'error' in response: print("API Error for %s: %s" % ( filename, response['error']['message'] if 'message' in response['error'] else '')) continue if 'textAnnotations' in response: text_response[filename] = response['textAnnotations'] else: text_response[filename] = [] return text_response except errors.HttpError as e: print("Http Error for %s: %s" % (filename, e)) except KeyError as e2: print("Key error: %s" % e2) # [END detect_text] # The inverted index is based in part on this example: # http://tech.swamps.io/simple-inverted-index-using-nltk/