EchoVault's Pub/Sub implementation aims to be compatible with Redis clients. This article is a brief description of how EchoVault implements the Pub/Sub module.
Over the last year, I’ve been building , an embeddable Redis alternative for the Golang ecosystem. EchoVault aims to replicate most of the Redis features while providing both an embedded interface and a client-server interface that is compatible with existing Redis clients using the RESP protocol. EchoVault One of the features implemented in EchoVault is the Pub/Sub feature. This article is a short walkthrough of how the Pub/Sub module has been implemented at the time of writing.
channel PUN Provide an embedded API to view the number of subscribers in the given channels. Implementation Now that we have the requirements set, let’s get into the implementation. At a high level, we’ll have a PubSub struct that provides all of the PubSub functionality. We will also have a Channel struct that provides the functionality for channels and pattern channels. For this section, we’ll use the tidwall/resp package. EchoVault users use this package to send RESP responses to channel subscribers.
P func NumPat int { ps.channelsRWMut.RLock defer ps.channelsRWMut.RUnlock var count int for _, channel :=range ps.channels { if channel.pattern !=nil && channel.IsActive { count +=1 } } return count } func NumSub byte { ps.channelsRWMut.RLock defer ps.channelsRWMut.RUnlock res :=fmt.Sprintf) for _, channel :=range channels { // If it's a pattern channel, skip it chanIdx :=slices.IndexFunc bool { return c.name==channel }) if chanIdx==-1 { res +=fmt.
ReadPubSubMessage { // Initialize connection tracker if calling subscribe for the first time if connections==nil { connections=make } // If connection with this name does not exist, create new connection it var readConn net.Conn var writeConn net.Conn if _, ok :=connections; !ok { readConn, writeConn=net.Pipe connections=conn{ readConn: &readConn, writeConn: &writeConn, } } // Subscribe connection to the provided channels cmd :=append go func { _, _=server.handleCommand, connections.
ReadPubSubMessage { // Initialize connection tracker if calling subscribe for the first time if connections==nil { connections=make } // If connection with this name does not exist, create new connection it var readConn net.Conn var writeConn net.Conn if _, ok :=connections; !ok { readConn, writeConn=net.Pipe connections=conn{ readConn: &readConn, writeConn: &writeConn, } } // Subscribe connection to the provided channels cmd :=append go func { _, _=server.handleCommand, connections.
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