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https://github.com/txix-open/etp
Event transport protocol - alternative to socket.io
https://github.com/txix-open/etp
client etp event-transport-protocol go golang server socket-io websocket
Last synced: 26 days ago
JSON representation
Event transport protocol - alternative to socket.io
- Host: GitHub
- URL: https://github.com/txix-open/etp
- Owner: txix-open
- License: mit
- Created: 2019-10-04T10:09:09.000Z (about 5 years ago)
- Default Branch: master
- Last Pushed: 2024-08-13T16:24:54.000Z (3 months ago)
- Last Synced: 2024-09-29T01:02:57.359Z (about 1 month ago)
- Topics: client, etp, event-transport-protocol, go, golang, server, socket-io, websocket
- Language: Go
- Homepage:
- Size: 91.8 KB
- Stars: 9
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
# etp
[](https://godoc.org/github.com/txix-open/etp/v3)
[](https://codecov.io/gh/txix-open/etp)
[](https://goreportcard.com/report/github.com/txix-open/etp/v3)
ETP - event transport protocol on WebSocket, simple and powerful.
Highly inspired by [socket.io](https://socket.io/). But there is no good implementation in Go, that is why `etp` exists.
The package based on [github.com/nhooyr/websocket](https://github.com/nhooyr/websocket).
## Install
```bash
go get -u github.com/txix-open/etp/v3
```
## Features:
- Rooms for server
- [Javascript client](https://github.com/txix-open/isp-etp-js-client)
- Concurrent event emitting
- Context based API
- Event acknowledgment (for sync communication)
## Internals
- WebSocket message
- `websocket.MessageText` (not binary)
- `||||`
- Each event is handled concurrently in separated goroutine
- Message limit is `1MB` by default
## Complete example
```go
package main
import (
"context"
"fmt"
"net/http"
"time"
"github.com/txix-open/etp/v3"
"github.com/txix-open/etp/v3/msg"
)
func main() {
srv := etp.NewServer(etp.WithServerAcceptOptions(&etp.AcceptOptions{
InsecureSkipVerify: true, //completely ignore CORS checks, enable only for dev purposes
}))
//callback to handle new connection
srv.OnConnect(func(conn *etp.Conn) {
//you have access to original HTTP request
fmt.Printf("id: %d, url: %s, connected\n", conn.Id(), conn.HttpRequest().URL)
srv.Rooms().Join(conn, "goodClients") //leave automatically then disconnected
conn.Data().Set("key", "value") //put any data associative with connection
})
//callback to handle disconnection
srv.OnDisconnect(func(conn *etp.Conn, err error) {
fmt.Println("disconnected", conn.Id(), err, etp.IsNormalClose(err))
})
//callback to handle any error during serving
srv.OnError(func(conn *etp.Conn, err error) {
connId := uint64(0)
// be careful, conn can be nil on upgrading protocol error (before success WebSocket connection)
if conn != nil {
connId = conn.Id()
}
fmt.Println("error", connId, err)
})
//your business event handler
//each event is handled in separated goroutine
srv.On("hello", etp.HandlerFunc(func(ctx context.Context, conn *etp.Conn, event msg.Event) []byte {
fmt.Printf("hello event received: %s, %s\n", event.Name, event.Data)
return []byte("hello handled")
}))
//fallback handler
srv.OnUnknownEvent(etp.HandlerFunc(func(ctx context.Context, conn *etp.Conn, event msg.Event) []byte {
fmt.Printf("unknown event received, %s, %s\n", event.Name, event.Data)
_ = conn.Close() //you may close a connection whenever you want
return nil
}))
mux := http.NewServeMux()
mux.Handle("GET /ws", srv)
go func() {
err := http.ListenAndServe(":8080", mux)
if err != nil {
panic(err)
}
}()
time.Sleep(1 * time.Second)
cli := etp.NewClient().
OnDisconnect(func(conn *etp.Conn, err error) { //basically you have all handlers like a server here
fmt.Println("client disconnected", conn.Id(), err)
})
err := cli.Dial(context.Background(), "ws://localhost:8080/ws")
if err != nil {
panic(err)
}
//to check connection is still alive
err = cli.Ping(context.Background())
if err != nil {
panic(err)
}
//simply emit event
err = cli.Emit(context.Background(), "hello", []byte("fire and forget"))
if err != nil {
panic(err)
}
//emit event and wait server response
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second) //highly recommended to set up timeout for waiting acknowledgment
defer cancel()
resp, err := cli.EmitWithAck(ctx, "hello", []byte("wait acknowledgment"))
if err != nil {
panic(err)
}
fmt.Printf("hello resposne: '%s'\n", resp)
//data can be empty
err = cli.Emit(ctx, "unknown event", nil)
if err != nil {
panic(err)
}
time.Sleep(15 * time.Second)
//call to disconnect all clients
srv.Shutdown()
}
```
## V3 Migration
* Internal message format is the same as `v2`
* Each event now is handled in separated goroutine (completely async)
* Significantly reduce code base, removed redundant interfaces
* Fixed some memory leaks and potential deadlocks
* Main package `github.com/txix-open/isp-etp-go/v2` -> `github.com/txix-open/etp/v3`
* `OnDefault` -> `OnUnknownEvent`
* `On*` API are the same either `etp.Client` and `etp.Server`
* WAS
```go
srv.On("event", func (conn etp.Conn, data []byte) {
log.Println("Received " + testEvent + ":" + string(data))
}).
```
* BECOME
```go
srv.On("hello", etp.HandlerFunc(func(ctx context.Context, conn *etp.Conn, event msg.Event) []byte {
fmt.Printf("hello event received: %s, %s\n", event.Name, event.Data)
return []byte("hello handled")
}))
```
The second param now is a interface.