Initial version for 2023 NHKG broadcast.
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de020de4c9
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@ -0,0 +1,279 @@
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package main
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import (
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"container/list"
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"flag"
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"fmt"
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"net"
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"net/http"
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"net/http/pprof"
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"net/url"
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"os"
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"os/signal"
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"strings"
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"sync"
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"sync/atomic"
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"syscall"
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"time"
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)
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type UpstreamConfig map[string]*url.URL
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func (config *UpstreamConfig) String() string {
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return fmt.Sprintf("%+v", (*map[string]*url.URL)(config))
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}
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func (config *UpstreamConfig) Set(value string) error {
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parts := strings.SplitN(value, "=", 2)
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if len(parts) < 2 {
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return fmt.Errorf("format error: not in name=url format: %s", value)
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}
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name := parts[0]
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if _, ok := (*config)[name]; ok {
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return fmt.Errorf("config error: remote %s already specified", name)
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}
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u, err := url.Parse(parts[1])
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if err != nil {
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return fmt.Errorf("format error: unable to parse url %s: %w", parts[1], err)
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}
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(*config)[name] = u
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fmt.Printf("Added remote %s with url %s\n", name, u)
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return nil
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}
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var listen = flag.String("listen", "unix:/var/run/tsb/tsb.sock", "Listen address of the service")
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var upstreams = make(UpstreamConfig)
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type UpstreamContext struct {
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viewerCond *sync.Cond
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viewer int64
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upstreamChan chan []byte
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clientsChanList *list.List
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newClientsChanList *list.List
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newChanLock *sync.Mutex
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}
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var upstreamContexts = make(map[string]*UpstreamContext)
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var upstreamContextLock = &sync.Mutex{}
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func GetUpstreamContext(name string) *UpstreamContext {
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upstreamContextLock.Lock()
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defer upstreamContextLock.Unlock()
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ctx, ok := upstreamContexts[name]
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if !ok {
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ctx = &UpstreamContext{
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viewerCond: sync.NewCond(&sync.Mutex{}),
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viewer: 0,
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upstreamChan: make(chan []byte),
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clientsChanList: list.New(),
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newClientsChanList: list.New(),
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newChanLock: &sync.Mutex{},
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}
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upstreamContexts[name] = ctx
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go upstreamFiber(name)
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go broadcastFiber(name)
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}
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return ctx
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}
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type ClientChannel struct {
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Notify chan struct{}
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Data chan []byte
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ctx *UpstreamContext
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}
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func NewClientChannel(name string) *ClientChannel {
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ctx := GetUpstreamContext(name)
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ch := &ClientChannel{
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Notify: make(chan struct{}),
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Data: make(chan []byte, 1024),
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ctx: ctx,
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}
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ctx.newChanLock.Lock()
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ctx.newClientsChanList.PushBack(ch)
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ctx.newChanLock.Unlock()
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if atomic.AddInt64(&ctx.viewer, 1) == 1 {
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ctx.viewerCond.Broadcast()
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}
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fmt.Printf("Current viewers for stream %s: %d\n", name, ctx.viewer)
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return ch
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}
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// Close the notify channel, to the server will stop sending data and remove this entry.
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func (ch *ClientChannel) Close() {
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close(ch.Notify)
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atomic.AddInt64(&ch.ctx.viewer, -1)
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}
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func init() {
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flag.Var(&upstreams, "upstream", "Upstream in name=URL format, may specify multiple times.")
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}
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func upstreamFiber(name string) {
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ctx := GetUpstreamContext(name)
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client := &http.Client{}
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req := &http.Request{
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Method: "GET",
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URL: upstreams[name],
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Close: true,
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}
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for {
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ctx.viewerCond.L.Lock()
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if ctx.viewer == 0 {
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fmt.Printf("No active viewers for stream %s, idling around :)\n", name)
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ctx.viewerCond.Wait()
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}
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ctx.viewerCond.L.Unlock()
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fmt.Printf("Connecting to upstream for stream %s ...\n", name)
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r := (func() *http.Response {
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for {
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r, err := client.Do(req)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Unable to request %s for stream %s: %v\n", upstreams[name], name, err)
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time.Sleep(5 * time.Second)
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continue
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}
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if r.StatusCode != 200 {
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fmt.Fprintf(os.Stderr, "Request to %s for stream %s failed with status code %d\n", upstreams[name], name, err)
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time.Sleep(5 * time.Second)
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continue
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}
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return r
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}
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})()
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body := r.Body
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for {
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buff := make([]byte, 65536)
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if ctx.viewer == 0 {
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fmt.Printf("No active viewers for %s, stopping reading from upstream.\n", name)
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break
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}
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n, err := body.Read(buff)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Upstream for stream %s request reached EOF\n", name)
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break
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}
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ctx.upstreamChan <- buff[:n]
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}
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body.Close()
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}
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}
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func broadcastFiber(name string) {
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ctx := GetUpstreamContext(name)
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for {
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chunk := <-ctx.upstreamChan
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// Send to all existing clients
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e := ctx.clientsChanList.Front()
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for e != nil {
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ch := e.Value.(*ClientChannel)
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select {
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case <-ch.Notify:
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// Closed client, remove this entry
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close(ch.Data)
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next := e.Next()
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ctx.clientsChanList.Remove(e)
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e = next
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case ch.Data <- chunk:
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e = e.Next()
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default:
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e = e.Next()
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}
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}
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// Try to serve all new clients, but don't get locked up here :)
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if ctx.newClientsChanList.Len() > 0 && ctx.newChanLock.TryLock() {
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ctx.clientsChanList.PushBackList(ctx.newClientsChanList)
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ctx.newClientsChanList.Init()
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ctx.newChanLock.Unlock()
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}
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}
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}
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func clientHandler(w http.ResponseWriter, r *http.Request) {
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remote := r.RemoteAddr
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if r.Header.Get("X-Remote-Addr") != "" {
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remote = r.Header.Get("X-Remote-Addr")
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}
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fmt.Printf("Client connection from %s accepted.\n", remote)
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w.Header().Add("Content-Type", "video/MP2T")
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w.WriteHeader(200)
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name := r.URL.Path
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if _, ok := upstreams[name]; !ok {
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http.NotFound(w, r)
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return
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}
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ch := NewClientChannel(name)
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defer ch.Close()
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for {
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chunk := <-ch.Data
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_, err := w.Write(chunk)
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if err != nil {
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fmt.Printf("Write to remote client %s failed, closing...\n", remote)
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break
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}
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}
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}
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func viewersHandler(w http.ResponseWriter, r *http.Request) {
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w.Header().Add("Content-Type", "text/plain")
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w.WriteHeader(200)
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name := r.URL.Path
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if name == "" {
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totalViewer := int64(0)
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upstreamContextLock.Lock()
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for name, ctx := range upstreamContexts {
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totalViewer += ctx.viewer
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fmt.Fprintf(w, "%s: %d\n", name, ctx.viewer)
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}
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upstreamContextLock.Unlock()
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fmt.Fprintf(w, "sum: %d\n", totalViewer)
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} else {
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if _, ok := upstreams[name]; !ok {
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http.NotFound(w, r)
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return
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}
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upstreamContextLock.Lock()
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ctx, ok := upstreamContexts[name]
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if !ok {
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fmt.Fprintf(w, "%s: 0\n", name)
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} else {
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fmt.Fprintf(w, "%s: %d\n", name, ctx.viewer)
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}
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upstreamContextLock.Unlock()
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}
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}
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func main() {
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flag.Parse()
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var listener net.Listener
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var err error
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if strings.HasPrefix(*listen, "unix:") {
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if listener, err = net.Listen("unix", (*listen)[5:]); err != nil {
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panic(err)
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}
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} else {
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if listener, err = net.Listen("tcp", *listen); err != nil {
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panic(err)
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}
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}
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handler := http.NewServeMux()
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handler.Handle("/stream/", http.StripPrefix("/stream/", http.HandlerFunc(clientHandler)))
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handler.Handle("/viewers/", http.StripPrefix("/viewers/", http.HandlerFunc(viewersHandler)))
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handler.HandleFunc("/debug/pprof/", pprof.Index)
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handler.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
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handler.HandleFunc("/debug/pprof/profile", pprof.Profile)
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handler.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
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handler.HandleFunc("/debug/pprof/trace", pprof.Trace)
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server := &http.Server{
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Handler: handler,
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}
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go server.Serve(listener)
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ch := make(chan os.Signal)
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signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
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select {
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case sig := <-ch:
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fmt.Fprintf(os.Stderr, "Caught signal %v, exiting...\n", sig)
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os.Exit(0)
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}
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}
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