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171 lines
4.2 KiB
171 lines
4.2 KiB
/*
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* mjpeg-proxy -- Republish a MJPEG HTTP image stream using a server in Go
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*
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* Copyright (C) 2015-2020, Valentin Vidic
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package main
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import (
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"encoding/json"
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"flag"
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"fmt"
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"io"
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"net"
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"net/http"
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"os"
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"runtime"
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"strings"
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"time"
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)
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var clientHeader string
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var stopDelay time.Duration
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var tcpSendBuffer int
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type configSource struct {
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Source string
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Username string
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Password string
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Path string
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Rate float64
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}
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func startSource(source, username, password, proxyUrl string, rate float64) error {
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chunker, err := NewChunker(proxyUrl, source, username, password, rate)
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if err != nil {
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return fmt.Errorf("chunker[%s]: create failed: %s", proxyUrl, err)
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}
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pubSub := NewPubSub(proxyUrl, chunker)
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pubSub.Start()
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fmt.Printf("chunker[%s]: serving from %s\n", proxyUrl, source)
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http.Handle(proxyUrl, pubSub)
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return nil
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}
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func loadConfig(filename string) error {
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file, err := os.Open(filename)
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if err != nil {
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return err
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}
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defer func() {
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err := file.Close()
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if err != nil {
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fmt.Printf("config: file close failed for %s: %s\n", file.Name(), err)
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}
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}()
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sources := make([]configSource, 0)
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dec := json.NewDecoder(file)
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err = dec.Decode(&sources)
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if err != nil && err != io.EOF {
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return err
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}
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exists := make(map[string]bool)
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for _, conf := range sources {
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if exists[conf.Path] {
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return fmt.Errorf("duplicate proxy path: %s", conf.Path)
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}
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err = startSource(conf.Source, conf.Username, conf.Password, conf.Path, conf.Rate)
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if err != nil {
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return err
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}
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exists[conf.Path] = true
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}
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return nil
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}
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func connStateEvent(conn net.Conn, event http.ConnState) {
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if event == http.StateActive && tcpSendBuffer > 0 {
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switch c := conn.(type) {
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case *net.TCPConn:
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c.SetWriteBuffer(tcpSendBuffer)
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case *net.UnixConn:
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c.SetWriteBuffer(tcpSendBuffer)
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}
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}
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}
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func unixListen(path string) (net.Listener, error) {
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fi, err := os.Stat(path)
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if !os.IsNotExist(err) && fi.Mode()&os.ModeSocket != 0 {
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os.Remove(path)
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}
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return net.Listen("unix", path)
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}
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func listenAndServe(addr string) error {
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var listener net.Listener
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var err error
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if strings.HasPrefix(addr, "unix:") {
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listener, err = unixListen(strings.TrimPrefix(addr, "unix:"))
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} else {
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listener, err = net.Listen("tcp", addr)
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}
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if err != nil {
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return err
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}
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fmt.Printf("server: starting on address %s\n", addr)
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server := &http.Server{
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ConnState: connStateEvent,
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}
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return server.Serve(listener)
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}
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func main() {
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source := flag.String("source", "http://example.com/img.mjpg", "source uri")
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username := flag.String("username", "", "source uri username")
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password := flag.String("password", "", "source uri password")
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sources := flag.String("sources", "", "JSON configuration file to load sources from")
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bind := flag.String("bind", ":8080", "proxy bind address")
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path := flag.String("path", "/", "proxy serving path")
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rate := flag.Float64("rate", 0, "limit output frame rate")
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maxprocs := flag.Int("maxprocs", 0, "limit number of CPUs used")
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flag.DurationVar(&stopDelay, "stopduration", 60*time.Second, "follow source after last client")
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flag.IntVar(&tcpSendBuffer, "sendbuffer", 4096, "limit buffering of frames")
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flag.StringVar(&clientHeader, "clientheader", "", "request header with client address")
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flag.Parse()
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if *maxprocs > 0 {
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runtime.GOMAXPROCS(*maxprocs)
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}
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var err error
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if *sources != "" {
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err = loadConfig(*sources)
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} else {
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err = startSource(*source, *username, *password, *path, *rate)
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}
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if err != nil {
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fmt.Println("config:", err)
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os.Exit(1)
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}
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err = listenAndServe(*bind)
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if err != nil {
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fmt.Println("server:", err)
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os.Exit(1)
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}
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}
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