From e0cd132567be48c315c8079d2ee67492585b9497 Mon Sep 17 00:00:00 2001
From: nobodynobodyee <nobodynobodyee@gmail.com>
Date: Mon, 10 Jul 2023 20:05:29 +0800
Subject: [PATCH] add TechEmpower code

---
 example/techempower.go | 126 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 example/techempower.go

diff --git a/example/techempower.go b/example/techempower.go
new file mode 100644
index 0000000..de3213f
--- /dev/null
+++ b/example/techempower.go
@@ -0,0 +1,126 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"sync/atomic"
+	"syscall"
+	"time"
+
+	"github.com/shaovie/goev"
+	"github.com/shaovie/goev/netfd"
+)
+
+var (
+	httpRespHeader        []byte
+	httpRespContentLength []byte
+	ticker                *time.Ticker
+	liveDate              atomic.Value
+)
+
+const httpHeaderS = "HTTP/1.1 200 OK\r\nConnection: keep-alive\r\nServer: goev\r\nContent-Type: text/plain\r\nDate: "
+const contentLengthS = "\r\nContent-Length: 13\r\n\r\nHello, World!"
+
+type Http struct {
+	goev.Event
+}
+
+func (h *Http) OnOpen(fd int, now int64) bool {
+	// AddEvHandler 尽量放在最后, (OnOpen 和ORead可能不在一个线程)
+	if err := h.GetReactor().AddEvHandler(h, fd, goev.EV_IN); err != nil {
+		return false
+	}
+	return true
+}
+func (h *Http) OnRead(fd int, evPollSharedBuff []byte, now int64) bool {
+	buf := evPollSharedBuff[:]
+	readN := 0
+	for {
+		if readN >= cap(buf) { // alloc new buff to read
+			readN = 1 // ^_^
+		}
+		n, err := netfd.Read(fd, buf[readN:])
+		if err != nil {
+			if err == syscall.EAGAIN { // epoll ET mode
+				break
+			}
+			return false
+		}
+		if n > 0 { // n > 0
+			readN += n
+			break // ^_^
+		} else { // n == 0 connection closed,  will not < 0
+			if readN == 0 {
+				// fmt.Println("peer closed. ", n)
+			}
+			return false
+		}
+	}
+	buf = buf[:0]
+	buf = append(buf, httpRespHeader...)
+	buf = append(buf, []byte(liveDate.Load().(string))...)
+	buf = append(buf, httpRespContentLength...)
+	netfd.Write(fd, buf) // Connection: close
+	return true
+}
+func (h *Http) OnClose(fd int) {
+	netfd.Close(fd)
+}
+
+func updateLiveSecond() {
+	for {
+		select {
+		case now := <-ticker.C:
+			liveDate.Store(now.Format("Mon, 02 Jan 2006 15:04:05 GMT"))
+		}
+	}
+}
+
+func main() {
+	fmt.Println("hello boy")
+	runtime.GOMAXPROCS(runtime.NumCPU()*2 - 1) // 留一部分给网卡中断
+
+	liveDate.Store(time.Now().Format("Mon, 02 Jan 2006 15:04:05 GMT"))
+	ticker = time.NewTicker(time.Millisecond * 1000)
+
+	httpRespHeader = []byte(httpHeaderS)
+	httpRespContentLength = []byte(contentLengthS)
+
+	forAcceptReactor, err := goev.NewReactor(
+		goev.EvDataArrSize(20480), // default val
+		goev.EvPollNum(1),
+		goev.EvReadyNum(8), // only accept fd
+		goev.NoTimer(true),
+	)
+	if err != nil {
+		panic(err.Error())
+	}
+	forNewFdReactor, err := goev.NewReactor(
+		goev.EvDataArrSize(20480), // default val
+		goev.EvPollNum(runtime.NumCPU()*2-1),
+		goev.EvReadyNum(512), // auto calc
+		goev.NoTimer(true),
+	)
+	if err != nil {
+		panic(err.Error())
+	}
+	//= http
+	_, err = goev.NewAcceptor(forAcceptReactor, forNewFdReactor, func() goev.EvHandler { return new(Http) },
+		":8080",
+		goev.ListenBacklog(512),
+		//goev.SockRcvBufSize(16*1024), // 短链接, 不需要很大的缓冲区
+	)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	go updateLiveSecond()
+	go func() {
+		if err = forAcceptReactor.Run(); err != nil {
+			panic(err.Error())
+		}
+	}()
+	if err = forNewFdReactor.Run(); err != nil {
+		panic(err.Error())
+	}
+}