//go:build !tinygo && linux package main import ( "os" "strconv" "sync/atomic" "time" "github.com/soypat/lneto/http/httpraw" ) const listenPort = 8080 func main() { if err := run(); err != nil { println("Error: ", err) os.Exit(1) } println("DONE") } func run() error { ln, err := Listen(listenPort) if err != nil { return err } defer ln.Close() println("listening on port", listenPort) conn := new(Conn) for { err := ln.Accept(conn) if err != nil { return err } visits.Add(1) if err := handle(conn); err != nil { println("handle:", conn.RemoteAddr().String(), err.Error()) } conn.Close() } } const ( htmlHead = `` + `` + `*** WELCOME TO MY HOMEPAGE ***` + `

YOU ARE VISITOR #` htmlTail = `!

` + `Sign my guestbook!` + `

Best viewed in Netscape Navigator` ) const maxHTTPHeader = 1024 var ( hdr httpraw.Header httpbuf [maxHTTPHeader]byte htmlbuf [512]byte visits atomic.Uint64 ) func handle(conn *Conn) error { hdr.Reset(httpbuf[:0]) hdr.EnableBufferGrowth(false) // Limit memory to buffer capacity. const incomingIsResponse = false // We get HTTP requests from clients. deadline := time.Now().Add(50 * time.Millisecond) for time.Until(deadline) > 0 { if _, err := hdr.ReadFromLimited(conn, maxHTTPHeader); err != nil { return err } needmoredata, err := hdr.TryParse(incomingIsResponse) if err != nil { return err } if needmoredata { continue } break } println("\n\n================\n\n", hdr.String()) if time.Since(deadline) > 0 { print("DEADLINE EXCEED: ", hdr.BufferParsed(), "/", hdr.BufferReceived(), " bytes parsed/read\n") return nil } // Prepare tacky HTML response. n := copy(htmlbuf[:], htmlHead) n += len(strconv.AppendUint(htmlbuf[n:n], visits.Load(), 10)) n += copy(htmlbuf[n:], htmlTail) contentLen := n hdr.Reset(httpbuf[:0]) hdr.SetProtocol("HTTP/1.1") hdr.SetStatus("200", "OK") hdr.Set("Content-Type", "text/html") hdr.SetInt("Content-Length", int64(contentLen), 10) // Here we do some buffer juggling. We use remaining space // of HTTP Header buffer to write the response that will be written over the wire. respbuf := httpbuf[hdr.BufferUsed():] header, err := hdr.AppendResponse(respbuf[:0]) if err != nil { return err } conn.Write(header) _, err = conn.Write(htmlbuf[:contentLen]) return err }