gnet

package main

import (
	"log"

	"github.com/panjf2000/gnet"
)

type echoServer struct {
	*gnet.EventServer
}

func (es *echoServer) React(c gnet.Conn) (out []byte, action gnet.Action) {
	out = c.Read()
	c.ResetBuffer()
	return
}

func main() {
	echo := new(echoServer)
	log.Fatal(gnet.Serve(echo, "tcp://:9000", gnet.WithMulticore(true)))
}

package main

import (
	"log"
	"time"

	"github.com/panjf2000/gnet"
	"github.com/panjf2000/gnet/pool/goroutine"
)

type echoServer struct {
	*gnet.EventServer
	pool *goroutine.Pool
}

func (es *echoServer) React(c gnet.Conn) (out []byte, action gnet.Action) {
	data := append([]byte{}, c.Read()...)
	c.ResetBuffer()

	// Use ants pool to unblock the event-loop.
	_ = es.pool.Submit(func() {
		time.Sleep(1 * time.Second)
		c.AsyncWrite(data)
	})

	return
}

func main() {
	p := goroutine.Default()
	defer p.Release()
	
	echo := &echoServer{pool: p}
	log.Fatal(gnet.Serve(echo, "tcp://:9000", gnet.WithMulticore(true)))
}

package main

import (
	"flag"
	"fmt"
	"log"

	"github.com/panjf2000/gnet"
)

type echoServer struct {
	*gnet.EventServer
}

func (es *echoServer) OnInitComplete(srv gnet.Server) (action gnet.Action) {
	log.Printf("Echo server is listening on %s (multi-cores: %t, loops: %d)\n",
		srv.Addr.String(), srv.Multicore, srv.NumEventLoop)
	return
}
func (es *echoServer) React(frame []byte, c gnet.Conn) (out []byte, action gnet.Action) {
	// Echo synchronously.
	out = frame
	return

	/*
		// Echo asynchronously.
		data := append([]byte{}, frame...)
		go func() {
			time.Sleep(time.Second)
			c.AsyncWrite(data)
		}()
		return
	*/
}

func main() {
	var port int
	var multicore bool

	// Example command: go run echo.go --port 9000 --multicore=true
	flag.IntVar(&port, "port", 9000, "--port 9000")
	flag.BoolVar(&multicore, "multicore", false, "--multicore true")
	flag.Parse()
	echo := new(echoServer)
	log.Fatal(gnet.Serve(echo, fmt.Sprintf("tcp://:%d", port), gnet.WithMulticore(multicore)))
}

package main

import (
	"flag"
	"fmt"
	"log"

	"github.com/panjf2000/gnet"
)

type echoServer struct {
	*gnet.EventServer
}

func (es *echoServer) OnInitComplete(srv gnet.Server) (action gnet.Action) {
	log.Printf("UDP Echo server is listening on %s (multi-cores: %t, loops: %d)\n",
		srv.Addr.String(), srv.Multicore, srv.NumEventLoop)
	return
}
func (es *echoServer) React(frame []byte, c gnet.Conn) (out []byte, action gnet.Action) {
	// Echo synchronously.
	out = frame
	return

	/*
		// Echo asynchronously.
		data := append([]byte{}, frame...)
		go func() {
			time.Sleep(time.Second)
			c.SendTo(data)
		}()
		return
	*/
}

func main() {
	var port int
	var multicore, reuseport bool

	// Example command: go run echo.go --port 9000 --multicore=true --reuseport=true
	flag.IntVar(&port, "port", 9000, "--port 9000")
	flag.BoolVar(&multicore, "multicore", false, "--multicore true")
	flag.BoolVar(&reuseport, "reuseport", false, "--reuseport true")
	flag.Parse()
	echo := new(echoServer)
	log.Fatal(gnet.Serve(echo, fmt.Sprintf("udp://:%d", port), gnet.WithMulticore(multicore), gnet.WithReusePort(reuseport)))
}

package main

import (
	"flag"
	"fmt"
	"log"

	"github.com/panjf2000/gnet"
)

type echoServer struct {
	*gnet.EventServer
}

func (es *echoServer) OnInitComplete(srv gnet.Server) (action gnet.Action) {
	log.Printf("Echo server is listening on %s (multi-cores: %t, loops: %d)\n",
		srv.Addr.String(), srv.Multicore, srv.NumEventLoop)
	return
}
func (es *echoServer) React(frame []byte, c gnet.Conn) (out []byte, action gnet.Action) {
	// Echo synchronously.
	out = frame
	return

	/*
		// Echo asynchronously.
		data := append([]byte{}, frame...)
		go func() {
			time.Sleep(time.Second)
			c.AsyncWrite(data)
		}()
		return
	*/
}

func main() {
	var addr string
	var multicore bool

	// Example command: go run echo.go --sock echo.sock --multicore=true
	flag.StringVar(&addr, "sock", "echo.sock", "--port 9000")
	flag.BoolVar(&multicore, "multicore", false, "--multicore true")
	flag.Parse()

	echo := new(echoServer)
	log.Fatal(gnet.Serve(echo, fmt.Sprintf("unix://%s", addr), gnet.WithMulticore(multicore)))
}

package main

import (
	"flag"
	"fmt"
	"log"
	"strconv"
	"strings"
	"time"
	"unsafe"

	"github.com/panjf2000/gnet"
)

var res string

type request struct {
	proto, method string
	path, query   string
	head, body    string
	remoteAddr    string
}

type httpServer struct {
	*gnet.EventServer
}

var errMsg = "Internal Server Error"
var errMsgBytes = []byte(errMsg)

type httpCodec struct {
	req request
}

func (hc *httpCodec) Encode(c gnet.Conn, buf []byte) (out []byte, err error) {
	if c.Context() == nil {
		return buf, nil
	}
	return appendResp(out, "500 Error", "", errMsg+"\n"), nil
}

func (hc *httpCodec) Decode(c gnet.Conn) (out []byte, err error) {
	buf := c.Read()
	c.ResetBuffer()

	// process the pipeline
	var leftover []byte
pipeline:
	leftover, err = parseReq(buf, &hc.req)
	// bad thing happened
	if err != nil {
		c.SetContext(err)
		return nil, err
	} else if len(leftover) == len(buf) {
		// request not ready, yet
		return
	}
	out = appendHandle(out, res)
	buf = leftover
	goto pipeline
}

func (hs *httpServer) OnInitComplete(srv gnet.Server) (action gnet.Action) {
	log.Printf("HTTP server is listening on %s (multi-cores: %t, loops: %d)\n",
		srv.Addr.String(), srv.Multicore, srv.NumEventLoop)
	return
}

func (hs *httpServer) React(frame []byte, c gnet.Conn) (out []byte, action gnet.Action) {
	if c.Context() != nil {
		// bad thing happened
		out = errMsgBytes
		action = gnet.Close
		return
	}
	// handle the request
	out = frame
	return
}

func main() {
	var port int
	var multicore bool

	// Example command: go run http.go --port 8080 --multicore=true
	flag.IntVar(&port, "port", 8080, "server port")
	flag.BoolVar(&multicore, "multicore", true, "multicore")
	flag.Parse()

	res = "Hello World!\r\n"

	http := new(httpServer)
	hc := new(httpCodec)

	// Start serving!
	log.Fatal(gnet.Serve(http, fmt.Sprintf("tcp://:%d", port), gnet.WithMulticore(multicore), gnet.WithCodec(hc)))
}

// appendHandle handles the incoming request and appends the response to
// the provided bytes, which is then returned to the caller.
func appendHandle(b []byte, res string) []byte {
	return appendResp(b, "200 OK", "", res)
}

// appendResp will append a valid http response to the provide bytes.
// The status param should be the code plus text such as "200 OK".
// The head parameter should be a series of lines ending with "\r\n" or empty.
func appendResp(b []byte, status, head, body string) []byte {
	b = append(b, "HTTP/1.1"...)
	b = append(b, ' ')
	b = append(b, status...)
	b = append(b, '\r', '\n')
	b = append(b, "Server: gnet\r\n"...)
	b = append(b, "Date: "...)
	b = time.Now().AppendFormat(b, "Mon, 02 Jan 2006 15:04:05 GMT")
	b = append(b, '\r', '\n')
	if len(body) > 0 {
		b = append(b, "Content-Length: "...)
		b = strconv.AppendInt(b, int64(len(body)), 10)
		b = append(b, '\r', '\n')
	}
	b = append(b, head...)
	b = append(b, '\r', '\n')
	if len(body) > 0 {
		b = append(b, body...)
	}
	return b
}

func b2s(b []byte) string {
	return *(*string)(unsafe.Pointer(&b))
}

// parseReq is a very simple http request parser. This operation
// waits for the entire payload to be buffered before returning a
// valid request.
func parseReq(data []byte, req *request) (leftover []byte, err error) {
	sdata := b2s(data)
	var i, s int
	var head string
	var clen int
	var q = -1
	// method, path, proto line
	for ; i < len(sdata); i++ {
		if sdata[i] == ' ' {
			req.method = sdata[s:i]
			for i, s = i+1, i+1; i < len(sdata); i++ {
				if sdata[i] == '?' && q == -1 {
					q = i - s
				} else if sdata[i] == ' ' {
					if q != -1 {
						req.path = sdata[s:q]
						req.query = req.path[q+1 : i]
					} else {
						req.path = sdata[s:i]
					}
					for i, s = i+1, i+1; i < len(sdata); i++ {
						if sdata[i] == '\n' && sdata[i-1] == '\r' {
							req.proto = sdata[s:i]
							i, s = i+1, i+1
							break
						}
					}
					break
				}
			}
			break
		}
	}
	if req.proto == "" {
		return data, fmt.Errorf("malformed request")
	}
	head = sdata[:s]
	for ; i < len(sdata); i++ {
		if i > 1 && sdata[i] == '\n' && sdata[i-1] == '\r' {
			line := sdata[s : i-1]
			s = i + 1
			if line == "" {
				req.head = sdata[len(head)+2 : i+1]
				i++
				if clen > 0 {
					if len(sdata[i:]) < clen {
						break
					}
					req.body = sdata[i : i+clen]
					i += clen
				}
				return data[i:], nil
			}
			if strings.HasPrefix(line, "Content-Length:") {
				n, err := strconv.ParseInt(strings.TrimSpace(line[len("Content-Length:"):]), 10, 64)
				if err == nil {
					clen = int(n)
				}
			}
		}
	}
	// not enough data
	return data, nil
}

package main

import (
	"flag"
	"fmt"
	"log"
	"sync"
	"time"

	"github.com/panjf2000/gnet"
)

type pushServer struct {
	*gnet.EventServer
	tick             time.Duration
	connectedSockets sync.Map
}

func (ps *pushServer) OnInitComplete(srv gnet.Server) (action gnet.Action) {
	log.Printf("Push server is listening on %s (multi-cores: %t, loops: %d), "+
		"pushing data every %s ...\n", srv.Addr.String(), srv.Multicore, srv.NumEventLoop, ps.tick.String())
	return
}
func (ps *pushServer) OnOpened(c gnet.Conn) (out []byte, action gnet.Action) {
	log.Printf("Socket with addr: %s has been opened...\n", c.RemoteAddr().String())
	ps.connectedSockets.Store(c.RemoteAddr().String(), c)
	return
}
func (ps *pushServer) OnClosed(c gnet.Conn, err error) (action gnet.Action) {
	log.Printf("Socket with addr: %s is closing...\n", c.RemoteAddr().String())
	ps.connectedSockets.Delete(c.RemoteAddr().String())
	return
}
func (ps *pushServer) Tick() (delay time.Duration, action gnet.Action) {
	log.Println("It's time to push data to clients!!!")
	ps.connectedSockets.Range(func(key, value interface{}) bool {
		addr := key.(string)
		c := value.(gnet.Conn)
		c.AsyncWrite([]byte(fmt.Sprintf("heart beating to %s\n", addr)))
		return true
	})
	delay = ps.tick
	return
}
func (ps *pushServer) React(frame []byte, c gnet.Conn) (out []byte, action gnet.Action) {
	out = frame
	return
}

func main() {
	var port int
	var multicore bool
	var interval time.Duration
	var ticker bool

	// Example command: go run push.go --port 9000 --tick 1s --multicore=true
	flag.IntVar(&port, "port", 9000, "server port")
	flag.BoolVar(&multicore, "multicore", true, "multicore")
	flag.DurationVar(&interval, "tick", 0, "pushing tick")
	flag.Parse()
	if interval > 0 {
		ticker = true
	}
	push := &pushServer{tick: interval}
	log.Fatal(gnet.Serve(push, fmt.Sprintf("tcp://:%d", port), gnet.WithMulticore(multicore), gnet.WithTicker(ticker)))
}

Client:

// Reference https://github.com/smallnest/goframe/blob/master/_examples/goclient/client.go

package main

import (
	"encoding/binary"
	"fmt"
	"net"

	"github.com/smallnest/goframe"
)

func main() {
	conn, err := net.Dial("tcp", "127.0.0.1:9000")
	if err != nil {
		panic(err)
	}
	defer conn.Close()

	encoderConfig := goframe.EncoderConfig{
		ByteOrder:                       binary.BigEndian,
		LengthFieldLength:               4,
		LengthAdjustment:                0,
		LengthIncludesLengthFieldLength: false,
	}

	decoderConfig := goframe.DecoderConfig{
		ByteOrder:           binary.BigEndian,
		LengthFieldOffset:   0,
		LengthFieldLength:   4,
		LengthAdjustment:    0,
		InitialBytesToStrip: 4,
	}

	fc := goframe.NewLengthFieldBasedFrameConn(encoderConfig, decoderConfig, conn)
	err = fc.WriteFrame([]byte("hello"))
	if err != nil {
		panic(err)
	}
	err = fc.WriteFrame([]byte("world"))
	if err != nil {
		panic(err)
	}

	buf, err := fc.ReadFrame()
	if err != nil {
		panic(err)
	}
	fmt.Println("received: ", string(buf))
	buf, err = fc.ReadFrame()
	if err != nil {
		panic(err)
	}
	fmt.Println("received: ", string(buf))
}

Server:

package main

import (
	"encoding/binary"
	"flag"
	"fmt"
	"log"
	"time"

	"github.com/panjf2000/gnet"
	"github.com/panjf2000/gnet/pool/goroutine"
)

type codecServer struct {
	*gnet.EventServer
	addr       string
	multicore  bool
	async      bool
	codec      gnet.ICodec
	workerPool *goroutine.Pool
}

func (cs *codecServer) OnInitComplete(srv gnet.Server) (action gnet.Action) {
	log.Printf("Test codec server is listening on %s (multi-cores: %t, loops: %d)\n",
		srv.Addr.String(), srv.Multicore, srv.NumEventLoop)
	return
}

func (cs *codecServer) React(frame []byte, c gnet.Conn) (out []byte, action gnet.Action) {
	if cs.async {
		data := append([]byte{}, frame...)
		_ = cs.workerPool.Submit(func() {
			c.AsyncWrite(data)
		})
		return
	}
	out = frame
	return
}

func testCodecServe(addr string, multicore, async bool, codec gnet.ICodec) {
	var err error
	if codec == nil {
		encoderConfig := gnet.EncoderConfig{
			ByteOrder:                       binary.BigEndian,
			LengthFieldLength:               4,
			LengthAdjustment:                0,
			LengthIncludesLengthFieldLength: false,
		}
		decoderConfig := gnet.DecoderConfig{
			ByteOrder:           binary.BigEndian,
			LengthFieldOffset:   0,
			LengthFieldLength:   4,
			LengthAdjustment:    0,
			InitialBytesToStrip: 4,
		}
		codec = gnet.NewLengthFieldBasedFrameCodec(encoderConfig, decoderConfig)
	}
	cs := &codecServer{addr: addr, multicore: multicore, async: async, codec: codec, workerPool: goroutine.Default()}
	err = gnet.Serve(cs, addr, gnet.WithMulticore(multicore), gnet.WithTCPKeepAlive(time.Minute*5), gnet.WithCodec(codec))
	if err != nil {
		panic(err)
	}
}

func main() {
	var port int
	var multicore bool

	// Example command: go run server.go --port 9000 --multicore=true
	flag.IntVar(&port, "port", 9000, "server port")
	flag.BoolVar(&multicore, "multicore", true, "multicore")
	flag.Parse()
	addr := fmt.Sprintf("tcp://:%d", port)
	testCodecServe(addr, multicore, false, nil)
}