nmdc-webfrontend/vendor/github.com/googollee/go-socket.io/README.md

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# socket.io
[![GoDoc](http://godoc.org/github.com/googollee/go-socket.io?status.svg)](http://godoc.org/github.com/googollee/go-socket.io) [![Build Status](https://travis-ci.org/googollee/go-socket.io.svg)](https://travis-ci.org/googollee/go-socket.io)
**Please use v1.4 branch, or import "gopkg.in/googollee/go-socket.io.v1". I have no time to maintain master branch now**
go-socket.io is an implementation of [socket.io](http://socket.io) in golang, which is a realtime application framework.
It is compatible with latest implementation of socket.io in node.js, and supports room and namespace.
* for compatability with socket.io 0.9.x, please use branch 0.9.x *
## Install
Install the package with:
```bash
go get github.com/googollee/go-socket.io
```
Import it with:
```go
import "github.com/googollee/go-socket.io"
```
and use `socketio` as the package name inside the code.
## Example
Please check the example folder for details.
```go
package main
import (
"log"
"net/http"
"github.com/googollee/go-socket.io"
)
func main() {
server, err := socketio.NewServer(nil)
if err != nil {
log.Fatal(err)
}
server.On("connection", func(so socketio.Socket) {
log.Println("on connection")
so.Join("chat")
so.On("chat message", func(msg string) {
log.Println("emit:", so.Emit("chat message", msg))
so.BroadcastTo("chat", "chat message", msg)
})
so.On("disconnection", func() {
log.Println("on disconnect")
})
})
server.On("error", func(so socketio.Socket, err error) {
log.Println("error:", err)
})
http.Handle("/socket.io/", server)
http.Handle("/", http.FileServer(http.Dir("./asset")))
log.Println("Serving at localhost:5000...")
log.Fatal(http.ListenAndServe(":5000", nil))
}
```
## Acknowledgements in go-socket.io 1.X.X
[See documentation about acknowledgements](http://socket.io/docs/#sending-and-getting-data-(acknowledgements))
##### Sending ACK with data from SERVER to CLIENT
* Client-side
```javascript
//using client-side socket.io-1.X.X.js
socket.emit('some:event', JSON.stringify(someData), function(data){
console.log('ACK from server wtih data: ', data));
});
```
* Server-side
```go
// The return type may vary depending on whether you will return
// In golang implementation of socket.io don't used callbacks for acknowledgement,
// but used return value, which wrapped into ack package and returned to the client's callback in JavaScript
so.On("some:event", func(msg string) string {
return msg //Sending ack with data in msg back to client, using "return statement"
})
```
##### Sending ACK with data from CLIENT to SERVER
* Client-side
```javascript
//using client-side socket.io-1.X.X.js
//last parameter of "on" handler is callback for sending ack to server with data or without data
socket.on('some:event', function (msg, sendAckCb) {
//Sending ACK with data to server after receiving some:event from server
sendAckCb(JSON.stringify(data)); // for example used serializing to JSON
}
```
* Server-side
```go
//You can use Emit or BroadcastTo with last parameter as callback for handling ack from client
//Sending packet to room "room_name" and event "some:event"
so.BroadcastTo("room_name", "some:event", dataForClient, func (so socketio.Socket, data string) {
log.Println("Client ACK with data: ", data)
})
// Or
so.Emit("some:event", dataForClient, func (so socketio.Socket, data string) {
log.Println("Client ACK with data: ", data)
})
```
## License
The 3-clause BSD License - see LICENSE for more details