socketcluster-client-go
Refer examples for more details :
Overview
This client provides following functionality
- Easy to setup and use
- Support for emitting and listening to remote events
- Pub/sub
- Authentication (JWT)
- Can be used for testing of all server side functions
To install use
go get github.com/sacOO7/socketcluster-client-go/scclientDescription
Create instance of scclient by passing url of socketcluster-server end-point
//Create a client instance
client := scclient.New("ws://192.168.100.11:8000/socketcluster/");
Important Note : Default url to socketcluster end-point is always ws://somedomainname.com/socketcluster/.
Registering basic listeners
Different functions are given as an argument to register listeners
package main
import (
"github.com/sacOO7/socketcluster-client-go/scclient"
"text/scanner"
"os"
"fmt"
)
func onConnect(client scclient.Client) {
fmt.Println("Connected to server")
}
func onDisconnect(client scclient.Client, err error) {
fmt.Printf("Error: %s\n", err.Error())
}
func onConnectError(client scclient.Client, err error) {
fmt.Printf("Error: %s\n", err.Error())
}
func onSetAuthentication(client scclient.Client, token string) {
fmt.Println("Auth token received :", token)
}
func onAuthentication(client scclient.Client, isAuthenticated bool) {
fmt.Println("Client authenticated :", isAuthenticated)
go startCode(client)
}
func main() {
var reader scanner.Scanner
client := scclient.New("ws://192.168.100.11:8000/socketcluster/");
client.SetBasicListener(onConnect, onConnectError, onDisconnect)
client.SetAuthenticationListener(onSetAuthentication, onAuthentication)
go client.Connect()
fmt.Println("Enter any key to terminate the program")
reader.Init(os.Stdin)
reader.Next()
// os.Exit(0)
}
func startCode(client scclient.Client) {
// start writing your code from here
// All emit, receive and publish events
}
Connecting to server
- For connecting to server:
//This will send websocket handshake request to socketcluster-server
client.Connect()Emitting and listening to events
Event emitter
- eventname is name of event and message can be String, boolean, int or structure
client.Emit(eventname,message);
// client.Emit("chat","This is a sample message")- To send event with acknowledgement
client.EmitAck("chat","This is a sample message", func(eventName string, error interface{}, data interface{}) {
if error == nil {
fmt.Println("Got ack for emit event with data ", data, " and error ", error)
}
})
Event Listener
- For listening to events :
The object received can be String, Boolean, Long or GO structure.
// Receiver code without sending acknowledgement back
client.On("chat", func(eventName string, data interface{}) {
fmt.Println("Got data ", data, " for event ", eventName)
})
- To send acknowledgement back to server
// Receiver code with ack
client.OnAck("chat", func(eventName string, data interface{}, ack func(error interface{}, data interface{})) {
fmt.Println("Got data ", data, " for event ", eventName)
fmt.Println("Sending back ack for the event")
ack("This is error", "This is data")
})
Implementing Pub-Sub via channels
Creating channel
- For creating and subscribing to channels:
// without acknowledgement
client.Subscribe("mychannel")
//with acknowledgement
client.SubscribeAck("mychannel", func(channelName string, error interface{}, data interface{}) {
if error == nil {
fmt.Println("Subscribed to channel ", channelName, "successfully")
}
})Publishing event on channel
- For publishing event :
// without acknowledgement
client.Publish("mychannel", "This is a data to be published")
// with acknowledgement
client.PublishAck("mychannel", "This is a data to be published", func(channelName string, error interface{}, data interface{}) {
if error == nil {
fmt.Println("Data published successfully to channel ", channelName)
}
})Listening to channel
- For listening to channel event :
client.OnChannel("mychannel", func(channelName string, data interface{}) {
fmt.Println("Got data ", data, " for channel ", channelName)
})
Un-subscribing to channel
// without acknowledgement
client.Unsubscribe("mychannel")
// with acknowledgement
client.UnsubscribeAck("mychannel", func(channelName string, error interface{}, data interface{}) {
if error == nil {
fmt.Println("Unsubscribed to channel ", channelName, "successfully")
}
})Closing the connection with server
client.Disconnect()Setting request headers
client.RequestHeader.Set("Accept-Encoding","gzip, deflate, sdch")
client.RequestHeader.Set("Accept-Language","en-US,en;q=0.8")
client.RequestHeader.Set("Pragma","no-cache")
client.RequestHeader.Set("User-Agent","Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36")
Setting proxy server
- It can be set using connectionOptions by providing url to proxy server
client.ConnectionOptions = gowebsocket.ConnectionOptions {
Proxy: gowebsocket.BuildProxy("http://example.com"),
}Setting data compression, ssl verification and subprotocols
- It can be set using connectionOptions inside socket
client.ConnectionOptions = gowebsocket.ConnectionOptions {
UseSSL:true,
UseCompression:true,
Subprotocols: [] string{"chat","superchat"},
}- ConnectionOptions needs to be applied before connecting to server