import contextlib
import threading
from typing import (Callable, Dict, Set, List, Optional, Tuple, Union)
+import zlib
import redis
from redis import Redis
from redis.sentinel import Sentinel
"""
def __init__(self, configuration: _Configuration) -> None:
super().__init__()
+ self.next_client_event = 0
+ self.clients = list()
with _map_to_sdl_exception():
- if configuration.get_params().db_sentinel_port:
- sentinel_node = (configuration.get_params().db_host,
- configuration.get_params().db_sentinel_port)
- master_name = configuration.get_params().db_sentinel_master_name
- self.__sentinel = Sentinel([sentinel_node])
- self.__redis = self.__sentinel.master_for(master_name)
- else:
- self.__redis = Redis(host=configuration.get_params().db_host,
- port=configuration.get_params().db_port,
- db=0,
- max_connections=20)
- self.__redis.set_response_callback('SETIE', lambda r: r and nativestr(r) == 'OK' or False)
- self.__redis.set_response_callback('DELIE', lambda r: r and int(r) == 1 or False)
-
- self.__redis_pubsub = PubSub(self.__redis.connection_pool, ignore_subscribe_messages=True)
- self.pubsub_thread = threading.Thread(target=None)
- self._run_in_thread = False
+ self.clients = self.__create_redis_clients(configuration)
def __del__(self):
self.close()
def __str__(self):
- return str(
- {
- "DB type": "Redis",
- "Redis connection": repr(self.__redis)
- }
- )
+ out = {"DB type": "Redis"}
+ for i, r in enumerate(self.clients):
+ out["Redis client[" + str(i) + "]"] = str(r)
+ return str(out)
def is_connected(self):
+ is_connected = True
with _map_to_sdl_exception():
- return self.__redis.ping()
+ for c in self.clients:
+ if not c.redis_client.ping():
+ is_connected = False
+ break
+ return is_connected
def close(self):
- self.__redis.close()
+ for c in self.clients:
+ c.redis_client.close()
def set(self, ns: str, data_map: Dict[str, bytes]) -> None:
- db_data_map = self._add_data_map_ns_prefix(ns, data_map)
+ db_data_map = self.__add_data_map_ns_prefix(ns, data_map)
with _map_to_sdl_exception():
- self.__redis.mset(db_data_map)
+ self.__getClient(ns).mset(db_data_map)
def set_if(self, ns: str, key: str, old_data: bytes, new_data: bytes) -> bool:
- db_key = self._add_key_ns_prefix(ns, key)
+ db_key = self.__add_key_ns_prefix(ns, key)
with _map_to_sdl_exception():
- return self.__redis.execute_command('SETIE', db_key, new_data, old_data)
+ return self.__getClient(ns).execute_command('SETIE', db_key, new_data, old_data)
def set_if_not_exists(self, ns: str, key: str, data: bytes) -> bool:
- db_key = self._add_key_ns_prefix(ns, key)
+ db_key = self.__add_key_ns_prefix(ns, key)
with _map_to_sdl_exception():
- return self.__redis.setnx(db_key, data)
+ return self.__getClient(ns).setnx(db_key, data)
def get(self, ns: str, keys: List[str]) -> Dict[str, bytes]:
ret = dict()
- db_keys = self._add_keys_ns_prefix(ns, keys)
+ db_keys = self.__add_keys_ns_prefix(ns, keys)
with _map_to_sdl_exception():
- values = self.__redis.mget(db_keys)
+ values = self.__getClient(ns).mget(db_keys)
for idx, val in enumerate(values):
# return only key values, which has a value
if val is not None:
return ret
def find_keys(self, ns: str, key_pattern: str) -> List[str]:
- db_key_pattern = self._add_key_ns_prefix(ns, key_pattern)
+ db_key_pattern = self.__add_key_ns_prefix(ns, key_pattern)
with _map_to_sdl_exception():
- ret = self.__redis.keys(db_key_pattern)
- return self._strip_ns_from_bin_keys(ns, ret)
+ ret = self.__getClient(ns).keys(db_key_pattern)
+ return self.__strip_ns_from_bin_keys(ns, ret)
def find_and_get(self, ns: str, key_pattern: str) -> Dict[str, bytes]:
# todo: replace below implementation with redis 'NGET' module
return ret
def remove(self, ns: str, keys: List[str]) -> None:
- db_keys = self._add_keys_ns_prefix(ns, keys)
+ db_keys = self.__add_keys_ns_prefix(ns, keys)
with _map_to_sdl_exception():
- self.__redis.delete(*db_keys)
+ self.__getClient(ns).delete(*db_keys)
def remove_if(self, ns: str, key: str, data: bytes) -> bool:
- db_key = self._add_key_ns_prefix(ns, key)
+ db_key = self.__add_key_ns_prefix(ns, key)
with _map_to_sdl_exception():
- return self.__redis.execute_command('DELIE', db_key, data)
+ return self.__getClient(ns).execute_command('DELIE', db_key, data)
def add_member(self, ns: str, group: str, members: Set[bytes]) -> None:
- db_key = self._add_key_ns_prefix(ns, group)
+ db_key = self.__add_key_ns_prefix(ns, group)
with _map_to_sdl_exception():
- self.__redis.sadd(db_key, *members)
+ self.__getClient(ns).sadd(db_key, *members)
def remove_member(self, ns: str, group: str, members: Set[bytes]) -> None:
- db_key = self._add_key_ns_prefix(ns, group)
+ db_key = self.__add_key_ns_prefix(ns, group)
with _map_to_sdl_exception():
- self.__redis.srem(db_key, *members)
+ self.__getClient(ns).srem(db_key, *members)
def remove_group(self, ns: str, group: str) -> None:
- db_key = self._add_key_ns_prefix(ns, group)
+ db_key = self.__add_key_ns_prefix(ns, group)
with _map_to_sdl_exception():
- self.__redis.delete(db_key)
+ self.__getClient(ns).delete(db_key)
def get_members(self, ns: str, group: str) -> Set[bytes]:
- db_key = self._add_key_ns_prefix(ns, group)
+ db_key = self.__add_key_ns_prefix(ns, group)
with _map_to_sdl_exception():
- return self.__redis.smembers(db_key)
+ return self.__getClient(ns).smembers(db_key)
def is_member(self, ns: str, group: str, member: bytes) -> bool:
- db_key = self._add_key_ns_prefix(ns, group)
+ db_key = self.__add_key_ns_prefix(ns, group)
with _map_to_sdl_exception():
- return self.__redis.sismember(db_key, member)
+ return self.__getClient(ns).sismember(db_key, member)
def group_size(self, ns: str, group: str) -> int:
- db_key = self._add_key_ns_prefix(ns, group)
+ db_key = self.__add_key_ns_prefix(ns, group)
with _map_to_sdl_exception():
- return self.__redis.scard(db_key)
+ return self.__getClient(ns).scard(db_key)
def set_and_publish(self, ns: str, channels_and_events: Dict[str, List[str]],
data_map: Dict[str, bytes]) -> None:
- db_data_map = self._add_data_map_ns_prefix(ns, data_map)
+ db_data_map = self.__add_data_map_ns_prefix(ns, data_map)
channels_and_events_prepared = []
total_events = 0
channels_and_events_prepared, total_events = self._prepare_channels(ns, channels_and_events)
with _map_to_sdl_exception():
- return self.__redis.execute_command(
+ return self.__getClient(ns).execute_command(
"MSETMPUB",
len(db_data_map),
total_events,
def set_if_and_publish(self, ns: str, channels_and_events: Dict[str, List[str]], key: str,
old_data: bytes, new_data: bytes) -> bool:
- db_key = self._add_key_ns_prefix(ns, key)
+ db_key = self.__add_key_ns_prefix(ns, key)
channels_and_events_prepared = []
channels_and_events_prepared, _ = self._prepare_channels(ns, channels_and_events)
with _map_to_sdl_exception():
- ret = self.__redis.execute_command("SETIEMPUB", db_key, new_data, old_data,
- *channels_and_events_prepared)
+ ret = self.__getClient(ns).execute_command("SETIEMPUB", db_key, new_data, old_data,
+ *channels_and_events_prepared)
return ret == b"OK"
def set_if_not_exists_and_publish(self, ns: str, channels_and_events: Dict[str, List[str]],
key: str, data: bytes) -> bool:
- db_key = self._add_key_ns_prefix(ns, key)
+ db_key = self.__add_key_ns_prefix(ns, key)
channels_and_events_prepared, _ = self._prepare_channels(ns, channels_and_events)
with _map_to_sdl_exception():
- ret = self.__redis.execute_command("SETNXMPUB", db_key, data,
- *channels_and_events_prepared)
+ ret = self.__getClient(ns).execute_command("SETNXMPUB", db_key, data,
+ *channels_and_events_prepared)
return ret == b"OK"
def remove_and_publish(self, ns: str, channels_and_events: Dict[str, List[str]],
keys: List[str]) -> None:
- db_keys = self._add_keys_ns_prefix(ns, keys)
+ db_keys = self.__add_keys_ns_prefix(ns, keys)
channels_and_events_prepared, total_events = self._prepare_channels(ns, channels_and_events)
with _map_to_sdl_exception():
- return self.__redis.execute_command(
+ return self.__getClient(ns).execute_command(
"DELMPUB",
len(db_keys),
total_events,
def remove_if_and_publish(self, ns: str, channels_and_events: Dict[str, List[str]], key: str,
data: bytes) -> bool:
- db_key = self._add_key_ns_prefix(ns, key)
+ db_key = self.__add_key_ns_prefix(ns, key)
channels_and_events_prepared, _ = self._prepare_channels(ns, channels_and_events)
with _map_to_sdl_exception():
- ret = self.__redis.execute_command("DELIEMPUB", db_key, data,
- *channels_and_events_prepared)
+ ret = self.__getClient(ns).execute_command("DELIEMPUB", db_key, data,
+ *channels_and_events_prepared)
return bool(ret)
def remove_all_and_publish(self, ns: str, channels_and_events: Dict[str, List[str]]) -> None:
- keys = self.__redis.keys(self._add_key_ns_prefix(ns, "*"))
+ keys = self.__getClient(ns).keys(self.__add_key_ns_prefix(ns, "*"))
channels_and_events_prepared, total_events = self._prepare_channels(ns, channels_and_events)
with _map_to_sdl_exception():
- return self.__redis.execute_command(
+ return self.__getClient(ns).execute_command(
"DELMPUB",
len(keys),
total_events,
def subscribe_channel(self, ns: str, cb: Callable[[str, str], None],
channels: List[str]) -> None:
- channels = self._add_keys_ns_prefix(ns, channels)
+ channels = self.__add_keys_ns_prefix(ns, channels)
for channel in channels:
with _map_to_sdl_exception():
- self.__redis_pubsub.subscribe(**{channel: cb})
- if not self.pubsub_thread.is_alive() and self._run_in_thread:
- self.pubsub_thread = self.__redis_pubsub.run_in_thread(sleep_time=0.001,
- daemon=True)
+ redis_ctx = self.__getClientConn(ns)
+ redis_ctx.redis_pubsub.subscribe(**{channel: cb})
+ if not redis_ctx.pubsub_thread.is_alive() and redis_ctx.run_in_thread:
+ redis_ctx.pubsub_thread = redis_ctx.redis_pubsub.run_in_thread(sleep_time=0.001,
+ daemon=True)
def unsubscribe_channel(self, ns: str, channels: List[str]) -> None:
- channels = self._add_keys_ns_prefix(ns, channels)
+ channels = self.__add_keys_ns_prefix(ns, channels)
for channel in channels:
with _map_to_sdl_exception():
- self.__redis_pubsub.unsubscribe(channel)
+ self.__getClientConn(ns).redis_pubsub.unsubscribe(channel)
def start_event_listener(self) -> None:
- if self.pubsub_thread.is_alive():
- raise RejectedByBackend("Event loop already started")
- if len(self.__redis.pubsub_channels()) > 0:
- self.pubsub_thread = self.__redis_pubsub.run_in_thread(sleep_time=0.001, daemon=True)
- self._run_in_thread = True
+ redis_ctxs = self.__getClientConns()
+ for redis_ctx in redis_ctxs:
+ if redis_ctx.pubsub_thread.is_alive():
+ raise RejectedByBackend("Event loop already started")
+ if redis_ctx.redis_pubsub.subscribed and len(redis_ctx.redis_client.pubsub_channels()) > 0:
+ redis_ctx.pubsub_thread = redis_ctx.redis_pubsub.run_in_thread(sleep_time=0.001, daemon=True)
+ redis_ctx.run_in_thread = True
def handle_events(self) -> Optional[Tuple[str, str]]:
- if self.pubsub_thread.is_alive() or self._run_in_thread:
+ if self.next_client_event >= len(self.clients):
+ self.next_client_event = 0
+ redis_ctx = self.clients[self.next_client_event]
+ self.next_client_event += 1
+ if redis_ctx.pubsub_thread.is_alive() or redis_ctx.run_in_thread:
raise RejectedByBackend("Event loop already started")
try:
- return self.__redis_pubsub.get_message(ignore_subscribe_messages=True)
+ return redis_ctx.redis_pubsub.get_message(ignore_subscribe_messages=True)
except RuntimeError:
return None
+ def __create_redis_clients(self, config):
+ clients = list()
+ cfg_params = config.get_params()
+ if cfg_params.db_cluster_addr_list is None:
+ clients.append(self.__create_legacy_redis_client(cfg_params))
+ else:
+ for addr in cfg_params.db_cluster_addr_list.split(","):
+ client = self.__create_redis_client(cfg_params, addr)
+ clients.append(client)
+ return clients
+
+ def __create_legacy_redis_client(self, cfg_params):
+ return self.__create_redis_client(cfg_params, cfg_params.db_host)
+
+ def __create_redis_client(self, cfg_params, addr):
+ new_sentinel = None
+ new_redis = None
+ if cfg_params.db_sentinel_port is None:
+ new_redis = Redis(host=addr, port=cfg_params.db_port, db=0, max_connections=20)
+ else:
+ sentinel_node = (addr, cfg_params.db_sentinel_port)
+ master_name = cfg_params.db_sentinel_master_name
+ new_sentinel = Sentinel([sentinel_node])
+ new_redis = new_sentinel.master_for(master_name)
+
+ new_redis.set_response_callback('SETIE', lambda r: r and nativestr(r) == 'OK' or False)
+ new_redis.set_response_callback('DELIE', lambda r: r and int(r) == 1 or False)
+
+ redis_pubsub = PubSub(new_redis.connection_pool, ignore_subscribe_messages=True)
+ pubsub_thread = threading.Thread(target=None)
+ run_in_thread = False
+
+ return _RedisConn(new_redis, redis_pubsub, pubsub_thread, run_in_thread)
+
+ def __getClientConns(self):
+ return self.clients
+
+ def __getClientConn(self, ns):
+ clients_cnt = len(self.clients)
+ client_id = self.__get_hash(ns) % clients_cnt
+ return self.clients[client_id]
+
+ def __getClient(self, ns):
+ clients_cnt = len(self.clients)
+ client_id = 0
+ if clients_cnt > 1:
+ client_id = self.__get_hash(ns) % clients_cnt
+ return self.clients[client_id].redis_client
+
+ @classmethod
+ def __get_hash(cls, str):
+ return zlib.crc32(str.encode())
+
@classmethod
- def _add_key_ns_prefix(cls, ns: str, key: str):
+ def __add_key_ns_prefix(cls, ns: str, key: str):
return '{' + ns + '},' + key
@classmethod
- def _add_keys_ns_prefix(cls, ns: str, keylist: List[str]) -> List[str]:
+ def __add_keys_ns_prefix(cls, ns: str, keylist: List[str]) -> List[str]:
ret_nskeys = []
for k in keylist:
ret_nskeys.append('{' + ns + '},' + k)
return ret_nskeys
@classmethod
- def _add_data_map_ns_prefix(cls, ns: str, data_dict: Dict[str, bytes]) -> Dict[str, bytes]:
+ def __add_data_map_ns_prefix(cls, ns: str, data_dict: Dict[str, bytes]) -> Dict[str, bytes]:
ret_nsdict = {}
for key, val in data_dict.items():
ret_nsdict['{' + ns + '},' + key] = val
return ret_nsdict
@classmethod
- def _strip_ns_from_bin_keys(cls, ns: str, nskeylist: List[bytes]) -> List[str]:
+ def __strip_ns_from_bin_keys(cls, ns: str, nskeylist: List[bytes]) -> List[str]:
ret_keys = []
for k in nskeylist:
try:
total_events = 0
for channel, events in channels_and_events.items():
for event in events:
- channels_and_events_prepared.append(cls._add_key_ns_prefix(ns, channel))
+ channels_and_events_prepared.append(cls.__add_key_ns_prefix(ns, channel))
channels_and_events_prepared.append(event)
total_events += 1
return channels_and_events_prepared, total_events
- def get_redis_connection(self):
- """Return existing Redis database connection."""
- return self.__redis
+ def get_redis_connection(self, ns: str):
+ """Return existing Redis database connection valid for the namespace."""
+ return self.__getClient(ns)
+
+
+class _RedisConn:
+ """
+ Internal class container to hold redis client connection
+ """
+
+ def __init__(self, redis_client, pubsub, pubsub_thread, run_in_thread):
+ self.redis_client = redis_client
+ self.redis_pubsub = pubsub
+ self.pubsub_thread = pubsub_thread
+ self.run_in_thread = run_in_thread
+
+ def __str__(self):
+ return str(
+ {
+ "Client": repr(self.redis_client),
+ "Subscrions": self.redis_pubsub.subscribed,
+ "PubSub thread": repr(self.pubsub_thread),
+ "Run in thread": self.run_in_thread,
+ }
+ )
class RedisBackendLock(DbBackendLockAbc):
def __init__(self, ns: str, name: str, expiration: Union[int, float],
redis_backend: RedisBackend) -> None:
super().__init__(ns, name)
- self.__redis = redis_backend.get_redis_connection()
+ self.__redis = redis_backend.get_redis_connection(ns)
with _map_to_sdl_exception():
redis_lockname = '{' + ns + '},' + self._lock_name
self.__redis_lock = Lock(redis=self.__redis, name=redis_lockname, timeout=expiration)
Code Review / ric-plt / sdlpy.git / blobdiff