v0.28.0

• Centrifuge v0.28.0 comes with an updated Redis Engine implementation based on rueian/rueidis library. Allocation efficiency and throughput of Redis Broker and PresenceManager were improved in both standalone and Cluster Redis setups. See #262 and blog post Improving Centrifugo Redis Engine throughput and allocation efficiency with Rueidis Go library for the reasoning and numbers behind.
• Work on a better observability and possibility to protect client protocol from misusing: Centrifuge now has CommandReadHandler and CommandProcessedHandler. These handlers are only available for client protocol v2, client protocol v1 will be removed soon. While it's not removed DisableProtocolVersion1 global var may be used to disable possibility for clients to connect to server with ProtocolVersion1.
• Client now can't send infinite number of pongs to the server, only one pong after receiving ping is allowed
• Client now can't send any command to the server after getting error in Connect command
• Disconnect client if it sends async message (using Send method) to the server while MessageHandler not set
• Possibility to dramatically reduce server CPU usage in case of sending many messages towards individual connections (it may be up to 5x reduction depending on message rate). This is possible with new options of ConnectReply: WriteDelay, ReplyWithoutQueue, MaxMessagesInFrame, QueueInitialCap which allow tweaking Centrifuge message write loop. See #270 for more details.
• Several internal optimizations in client protocol to reduce memory allocations a bit.
• More human-readable tracing logging output (especially in Protobuf protocol case). On the other hand, tracing log level is much more expensive now. We never assumed it will be used in production – so seems an acceptable trade-off.
• Update centrifuge-js version in all examples

gorelease -base v0.27.2 -version v0.28.0

# github.com/centrifugal/centrifuge
## incompatible changes
(*Client).Handle: removed
(*Client).HandleCommand: changed from func(*github.com/centrifugal/protocol.Command) bool to func(*github.com/centrifugal/protocol.Command, int) bool
CommandReadHandler: changed from func(*Client, CommandReadEvent) to func(*Client, CommandReadEvent) error
DefaultRedisBrokerPrefix: removed
DefaultRedisConnectTimeout: removed
DefaultRedisPresenceManagerPrefix: removed
DefaultRedisPresenceTTL: removed
DefaultRedisReadTimeout: removed
DefaultRedisWriteTimeout: removed
RedisBrokerConfig.PubSubNumWorkers: removed
RedisShardConfig.IdleTimeout: removed
RedisShardConfig.ReadTimeout: removed
RedisShardConfig.TLSSkipVerify: removed
RedisShardConfig.UseTLS: removed
RedisShardConfig.WriteTimeout: removed
## compatible changes
(*Node).OnCommandProcessed: added
CommandProcessedEvent: added
CommandProcessedHandler: added
CommandReadEvent.CommandSize: added
ConnectReply.MaxMessagesInFrame: added
ConnectReply.QueueInitialCap: added
ConnectReply.ReplyWithoutQueue: added
ConnectReply.WriteDelay: added
DisableProtocolVersion1: added
DisconnectNotAvailable: added
DisconnectPermissionDenied: added
DisconnectTooManyErrors: added
DisconnectTooManyRequests: added
HandleReadFrame: added
RedisShardConfig.ClientName: added
RedisShardConfig.IOTimeout: added
RedisShardConfig.SentinelClientName: added
RedisShardConfig.SentinelTLSConfig: added

# summary
v0.28.0 is a valid semantic version for this release.