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proc
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redis
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asyncio
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sentinel.py
import asyncio import random import weakref from typing import AsyncIterator, Iterable, Mapping, Sequence, Tuple, Type from redis.asyncio.client import Redis from redis.asyncio.connection import ( Connection, ConnectionPool, EncodableT, SSLConnection, ) from redis.commands import AsyncSentinelCommands from redis.exceptions import ConnectionError, ReadOnlyError, ResponseError, TimeoutError from redis.utils import str_if_bytes class MasterNotFoundError(ConnectionError): pass class SlaveNotFoundError(ConnectionError): pass class SentinelManagedConnection(Connection): def __init__(self, **kwargs): self.connection_pool = kwargs.pop("connection_pool") super().__init__(**kwargs) def __repr__(self): pool = self.connection_pool s = f"{self.__class__.__name__}<service={pool.service_name}" if self.host: host_info = f",host={self.host},port={self.port}" s += host_info return s + ">" async def connect_to(self, address): self.host, self.port = address await super().connect() if self.connection_pool.check_connection: await self.send_command("PING") if str_if_bytes(await self.read_response()) != "PONG": raise ConnectionError("PING failed") async def connect(self): if self._reader: return # already connected if self.connection_pool.is_master: await self.connect_to(await self.connection_pool.get_master_address()) else: async for slave in self.connection_pool.rotate_slaves(): try: return await self.connect_to(slave) except ConnectionError: continue raise SlaveNotFoundError # Never be here async def read_response(self, disable_decoding: bool = False): try: return await super().read_response(disable_decoding=disable_decoding) except ReadOnlyError: if self.connection_pool.is_master: # When talking to a master, a ReadOnlyError when likely # indicates that the previous master that we're still connected # to has been demoted to a slave and there's a new master. # calling disconnect will force the connection to re-query # sentinel during the next connect() attempt. await self.disconnect() raise ConnectionError("The previous master is now a slave") raise class SentinelManagedSSLConnection(SentinelManagedConnection, SSLConnection): pass class SentinelConnectionPool(ConnectionPool): """ Sentinel backed connection pool. If ``check_connection`` flag is set to True, SentinelManagedConnection sends a PING command right after establishing the connection. """ def __init__(self, service_name, sentinel_manager, **kwargs): kwargs["connection_class"] = kwargs.get( "connection_class", SentinelManagedSSLConnection if kwargs.pop("ssl", False) else SentinelManagedConnection, ) self.is_master = kwargs.pop("is_master", True) self.check_connection = kwargs.pop("check_connection", False) super().__init__(**kwargs) self.connection_kwargs["connection_pool"] = weakref.proxy(self) self.service_name = service_name self.sentinel_manager = sentinel_manager self.master_address = None self.slave_rr_counter = None def __repr__(self): return ( f"{self.__class__.__name__}" f"<service={self.service_name}({self.is_master and 'master' or 'slave'})>" ) def reset(self): super().reset() self.master_address = None self.slave_rr_counter = None def owns_connection(self, connection: Connection): check = not self.is_master or ( self.is_master and self.master_address == (connection.host, connection.port) ) return check and super().owns_connection(connection) async def get_master_address(self): master_address = await self.sentinel_manager.discover_master(self.service_name) if self.is_master: if self.master_address != master_address: self.master_address = master_address # disconnect any idle connections so that they reconnect # to the new master the next time that they are used. await self.disconnect(inuse_connections=False) return master_address async def rotate_slaves(self) -> AsyncIterator: """Round-robin slave balancer""" slaves = await self.sentinel_manager.discover_slaves(self.service_name) if slaves: if self.slave_rr_counter is None: self.slave_rr_counter = random.randint(0, len(slaves) - 1) for _ in range(len(slaves)): self.slave_rr_counter = (self.slave_rr_counter + 1) % len(slaves) slave = slaves[self.slave_rr_counter] yield slave # Fallback to the master connection try: yield await self.get_master_address() except MasterNotFoundError: pass raise SlaveNotFoundError(f"No slave found for {self.service_name!r}") class Sentinel(AsyncSentinelCommands): """ Redis Sentinel cluster client >>> from redis.sentinel import Sentinel >>> sentinel = Sentinel([('localhost', 26379)], socket_timeout=0.1) >>> master = sentinel.master_for('mymaster', socket_timeout=0.1) >>> await master.set('foo', 'bar') >>> slave = sentinel.slave_for('mymaster', socket_timeout=0.1) >>> await slave.get('foo') b'bar' ``sentinels`` is a list of sentinel nodes. Each node is represented by a pair (hostname, port). ``min_other_sentinels`` defined a minimum number of peers for a sentinel. When querying a sentinel, if it doesn't meet this threshold, responses from that sentinel won't be considered valid. ``sentinel_kwargs`` is a dictionary of connection arguments used when connecting to sentinel instances. Any argument that can be passed to a normal Redis connection can be specified here. If ``sentinel_kwargs`` is not specified, any socket_timeout and socket_keepalive options specified in ``connection_kwargs`` will be used. ``connection_kwargs`` are keyword arguments that will be used when establishing a connection to a Redis server. """ def __init__( self, sentinels, min_other_sentinels=0, sentinel_kwargs=None, **connection_kwargs, ): # if sentinel_kwargs isn't defined, use the socket_* options from # connection_kwargs if sentinel_kwargs is None: sentinel_kwargs = { k: v for k, v in connection_kwargs.items() if k.startswith("socket_") } self.sentinel_kwargs = sentinel_kwargs self.sentinels = [ Redis(host=hostname, port=port, **self.sentinel_kwargs) for hostname, port in sentinels ] self.min_other_sentinels = min_other_sentinels self.connection_kwargs = connection_kwargs async def execute_command(self, *args, **kwargs): """ Execute Sentinel command in sentinel nodes. once - If set to True, then execute the resulting command on a single node at random, rather than across the entire sentinel cluster. """ once = bool(kwargs.get("once", False)) if "once" in kwargs.keys(): kwargs.pop("once") if once: tasks = [ asyncio.Task(sentinel.execute_command(*args, **kwargs)) for sentinel in self.sentinels ] await asyncio.gather(*tasks) else: await random.choice(self.sentinels).execute_command(*args, **kwargs) return True def __repr__(self): sentinel_addresses = [] for sentinel in self.sentinels: sentinel_addresses.append( f"{sentinel.connection_pool.connection_kwargs['host']}:" f"{sentinel.connection_pool.connection_kwargs['port']}" ) return f"{self.__class__.__name__}<sentinels=[{','.join(sentinel_addresses)}]>" def check_master_state(self, state: dict, service_name: str) -> bool: if not state["is_master"] or state["is_sdown"] or state["is_odown"]: return False # Check if our sentinel doesn't see other nodes if state["num-other-sentinels"] < self.min_other_sentinels: return False return True async def discover_master(self, service_name: str): """ Asks sentinel servers for the Redis master's address corresponding to the service labeled ``service_name``. Returns a pair (address, port) or raises MasterNotFoundError if no master is found. """ for sentinel_no, sentinel in enumerate(self.sentinels): try: masters = await sentinel.sentinel_masters() except (ConnectionError, TimeoutError): continue state = masters.get(service_name) if state and self.check_master_state(state, service_name): # Put this sentinel at the top of the list self.sentinels[0], self.sentinels[sentinel_no] = ( sentinel, self.sentinels[0], ) return state["ip"], state["port"] raise MasterNotFoundError(f"No master found for {service_name!r}") def filter_slaves( self, slaves: Iterable[Mapping] ) -> Sequence[Tuple[EncodableT, EncodableT]]: """Remove slaves that are in an ODOWN or SDOWN state""" slaves_alive = [] for slave in slaves: if slave["is_odown"] or slave["is_sdown"]: continue slaves_alive.append((slave["ip"], slave["port"])) return slaves_alive async def discover_slaves( self, service_name: str ) -> Sequence[Tuple[EncodableT, EncodableT]]: """Returns a list of alive slaves for service ``service_name``""" for sentinel in self.sentinels: try: slaves = await sentinel.sentinel_slaves(service_name) except (ConnectionError, ResponseError, TimeoutError): continue slaves = self.filter_slaves(slaves) if slaves: return slaves return [] def master_for( self, service_name: str, redis_class: Type[Redis] = Redis, connection_pool_class: Type[SentinelConnectionPool] = SentinelConnectionPool, **kwargs, ): """ Returns a redis client instance for the ``service_name`` master. A :py:class:`~redis.sentinel.SentinelConnectionPool` class is used to retrieve the master's address before establishing a new connection. NOTE: If the master's address has changed, any cached connections to the old master are closed. By default clients will be a :py:class:`~redis.Redis` instance. Specify a different class to the ``redis_class`` argument if you desire something different. The ``connection_pool_class`` specifies the connection pool to use. The :py:class:`~redis.sentinel.SentinelConnectionPool` will be used by default. All other keyword arguments are merged with any connection_kwargs passed to this class and passed to the connection pool as keyword arguments to be used to initialize Redis connections. """ kwargs["is_master"] = True connection_kwargs = dict(self.connection_kwargs) connection_kwargs.update(kwargs) return redis_class( connection_pool=connection_pool_class( service_name, self, **connection_kwargs ) ) def slave_for( self, service_name: str, redis_class: Type[Redis] = Redis, connection_pool_class: Type[SentinelConnectionPool] = SentinelConnectionPool, **kwargs, ): """ Returns redis client instance for the ``service_name`` slave(s). A SentinelConnectionPool class is used to retrieve the slave's address before establishing a new connection. By default clients will be a :py:class:`~redis.Redis` instance. Specify a different class to the ``redis_class`` argument if you desire something different. The ``connection_pool_class`` specifies the connection pool to use. The SentinelConnectionPool will be used by default. All other keyword arguments are merged with any connection_kwargs passed to this class and passed to the connection pool as keyword arguments to be used to initialize Redis connections. """ kwargs["is_master"] = False connection_kwargs = dict(self.connection_kwargs) connection_kwargs.update(kwargs) return redis_class( connection_pool=connection_pool_class( service_name, self, **connection_kwargs ) )
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