NBIO - NON-BLOCKING IO

NBIO - NON-BLOCKING IO

Features

Cross Platform

Linux: Epoll with LT/ET/ET+ONESHOT supported, LT as default
BSD(MacOS): Kqueue
Windows: Based on std net, for debugging only

Protocols Supported

TCP/UDP/Unix Socket supported
TLS supported
HTTP/HTTPS 1.x supported
Websocket supported, Passes the Autobahn Test Suite, OnOpen/OnMessage/OnClose order guaranteed

Interfaces

Implements a non-blocking net.Conn(except windows)
SetDeadline/SetReadDeadline/SetWriteDeadline supported
Concurrent Write/Close supported(both nbio.Conn and nbio/nbhttp/websocket.Conn)

Quick Start

package main

import (
	"log"

	"github.com/lesismal/nbio"
)

func main() {
	engine := nbio.NewEngine(nbio.Config{
		Network:            "tcp",//"udp", "unix"
		Addrs:              []string{":8888"},
		MaxWriteBufferSize: 6 * 1024 * 1024,
	})

	// hanlde new connection
	engine.OnOpen(func(c *nbio.Conn) {
		log.Println("OnOpen:", c.RemoteAddr().String())
	})
	// hanlde connection closed
	engine.OnClose(func(c *nbio.Conn, err error) {
		log.Println("OnClose:", c.RemoteAddr().String(), err)
	})
	// handle data
	engine.OnData(func(c *nbio.Conn, data []byte) {
		c.Write(append([]byte{}, data...))
	})

	err := engine.Start()
	if err != nil {
		log.Fatalf("nbio.Start failed: %v\n", err)
		return
	}
	defer engine.Stop()

	<-make(chan int)
}

TCP Echo Examples

UDP Echo Examples

TLS Examples

HTTP Examples

HTTPS Examples

http-tls_server
visit: https://localhost:8888/echo

Websocket Examples

Websocket TLS Examples

Use With Other STD Based Frameworkds

Magics For HTTP and Websocket

Different IOMod

IOMod	Remarks
IOModNonBlocking	There's no difference between this IOMod and the old version with no IOMod. All the connections will be handled by poller.
IOModBlocking	All the connections will be handled by at least one goroutine, for websocket, we can set Upgrader.BlockingModAsyncWrite=true to handle writting with a separated goroutine and then avoid Head-of-line blocking on broadcasting scenarios.
IOModMixed	We set the Engine.MaxBlockingOnline, if the online num is smaller than it, the new connection will be handled by single goroutine as IOModBlocking, else the new connection will be handled by poller.

The IOModBlocking aims to improve the performance for low online service, it runs faster than std. The IOModMixed aims to keep a balance between performance and cpu/mem cost in different scenarios: when there are not too many online connections, it performs better than std, or else it can serve lots of online connections and keep healthy.

Using Websocket With Std Server

package main

import (
	"fmt"
	"log"
	"net/http"

	"github.com/lesismal/nbio/nbhttp/websocket"
)

func echo(w http.ResponseWriter, r *http.Request) {
	u := websocket.NewUpgrader()
	u.OnMessage(func(c *websocket.Conn, mt websocket.MessageType, data []byte) {
		c.WriteMessage(mt, data)
	})
	_, err := u.Upgrade(w, r, nil)
	if err != nil {
		log.Print("upgrade:", err)
		return
	}
}

func main() {
	mux := &http.ServeMux{}
	mux.HandleFunc("/ws", echo)
	server := http.Server{
		Addr:    "localhost:8080",
		Handler: mux,
	}
	fmt.Println("server exit:", server.ListenAndServe())
}

More Examples

nbio-examples

juddbaguio/nbio