Make ephemeral udp ports configurable

go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/cpuguy83/go-md2man/v2 v2.0.3 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/google/uuid v1.4.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.1.0 // indirect
 	github.com/pion/datachannel v1.5.5 // indirect
 	github.com/pion/dtls/v2 v2.2.8 // indirect
 	github.com/pion/ice/v3 v3.0.2 // indirect

go.sum

@@ -37,6 +37,8 @@ github.com/onsi/ginkgo v1.16.5/go.mod h1:+E8gABHa3K6zRBolWtd+ROzc/U5bkGt0FwiG042
 github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/onsi/gomega v1.17.0/go.mod h1:HnhC7FXeEQY45zxNK3PPoIUhzk/80Xly9PcubAlGdZY=
+github.com/pelletier/go-toml/v2 v2.1.0 h1:FnwAJ4oYMvbT/34k9zzHuZNrhlz48GB3/s6at6/MHO4=
+github.com/pelletier/go-toml/v2 v2.1.0/go.mod h1:tJU2Z3ZkXwnxa4DPO899bsyIoywizdUvyaeZurnPPDc=
 github.com/pion/datachannel v1.5.5 h1:10ef4kwdjije+M9d7Xm9im2Y3O6A6ccQb0zcqZcJew8=
 github.com/pion/datachannel v1.5.5/go.mod h1:iMz+lECmfdCMqFRhXhcA/219B0SQlbpoR2V118yimL0=
 github.com/pion/dtls/v2 v2.2.7/go.mod h1:8WiMkebSHFD0T+dIU+UeBaoV7kDhOW5oDCzZ7WZ/F9s=

main.go

@@ -2,7 +2,10 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
+	"log/slog"
+	"net/http"
 	"os"
 
 	"git.t-juice.club/torjus/ministream/server"
@@ -11,6 +14,12 @@ import (
 
 const Version = "v0.1.1"
 
+type ctxKey string
+
+const (
+	ctxKeyConfig ctxKey = "config"
+)
+
 func main() {
 	app := cli.App{
 		Name:  "ministream",
@@ -19,12 +28,16 @@ func main() {
 			{
 				Name:   "serve",
 				Usage:  "Start livestreaming server.",
-				Action: func(ctx *cli.Context) error {
+				Before: loadConfig,
-					store := server.NewUserStore()
+				Action: func(c *cli.Context) error {
+					cfg := configFromCtx(c.Context)
 
-					srv := server.NewServer(store)
+					srv := server.NewServer(cfg)
-					srv.Addr = ":8080"
+					srv.Addr = cfg.HTTP.ListenAddr
-					srv.ListenAndServe()
+					slog.Info("Starting HTTP-server", "addr", srv.Addr, "cfg", cfg)
+					if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+						return err
+					}
 					return nil
 				},
 			},
@@ -37,3 +50,27 @@ func main() {
 		fmt.Println(err)
 	}
 }
+
+func loadConfig(c *cli.Context) error {
+	cfg, err := server.ConfigFromDefault()
+	if err != nil {
+		return err
+	}
+
+	c.Context = context.WithValue(c.Context, ctxKeyConfig, cfg)
+	return nil
+}
+
+func configFromCtx(ctx context.Context) *server.Config {
+	value := ctx.Value(ctxKeyConfig)
+	if value == nil {
+		panic("unable to load config")
+	}
+
+	config, ok := value.(*server.Config)
+	if !ok {
+		panic("config type assertion failed")
+	}
+
+	return config
+}

ministream.toml

@@ -0,0 +1,21 @@
+# SiteName is used for displaying title of site on frontend.
+# Default: "ministream"
+# Env: MINISTREAM_SITENAME
+SiteName = "stream.example.org"
+
+[HTTP]
+# HTTPListenAddr is which port the HTTP server will listen on.
+# Default: ":8080"
+# Env: MINISTREAM_HTTP_LISTENADDR
+ListenAddr = ":8080"
+
+[WebRTC]
+# UDPMin is the minimum used for ephemeral ports.
+# Default: 50000
+# Env: MINISTREAM_WEBRTC_UDPMIN
+UDPMin = 50000
+
+# UDPMax is the maximum used for ephemeral ports.
+# Default: 50050
+# Env: MINISTREAM_WEBRTC_UDPMAX
+UDPMAX = 50050

server/config.go

@@ -0,0 +1,105 @@
+package server
+
+import (
+	"io"
+	"os"
+	"strconv"
+
+	"github.com/pelletier/go-toml/v2"
+)
+
+type Config struct {
+	SiteName string       `toml:"siteName"`
+	HTTP     ConfigHTTP   `toml:"http"`
+	WebRTC   ConfigWebRTC `toml:"WebRTC"`
+}
+
+type ConfigHTTP struct {
+	ListenAddr string `json:"ListenAddr" toml:"ListenAddr"`
+}
+
+type ConfigWebRTC struct {
+	UDPMin int `toml:"UDPMin"`
+	UDPMax int `toml:"UDPMax"`
+}
+
+func DefaultConfig() *Config {
+	return &Config{
+		SiteName: "ministream",
+		HTTP: ConfigHTTP{
+			ListenAddr: ":8080",
+		},
+		WebRTC: ConfigWebRTC{
+			UDPMin: 50000,
+			UDPMax: 50050,
+		},
+	}
+}
+
+func (c *Config) OverrideFromEnv() {
+	if siteName, ok := os.LookupEnv("MINISTREAM_SITENAME"); ok {
+		c.SiteName = siteName
+	}
+
+	if httpAddr, ok := os.LookupEnv("MINISTREAM_HTTP_LISTENADDR"); ok {
+		c.HTTP.ListenAddr = httpAddr
+	}
+
+	if value, ok := os.LookupEnv("MINISTREAM_WEBRTC_UDPMIN"); ok {
+		min, err := strconv.Atoi(value)
+		if err != nil {
+			panic("MINISTREAM_WEBRTC_UDPMIN is invalid")
+		}
+		c.WebRTC.UDPMin = min
+	}
+	if value, ok := os.LookupEnv("MINISTREAM_WEBRTC_UDPMAX"); ok {
+		max, err := strconv.Atoi(value)
+		if err != nil {
+			panic("MINISTREAM_WEBRTC_UDPMAX is invalid")
+		}
+		c.WebRTC.UDPMin = max
+	}
+}
+
+func ConfigFromReader(r io.Reader) (*Config, error) {
+	var c Config
+
+	err := toml.NewDecoder(r).Decode(&c)
+	if err != nil {
+		return nil, err
+	}
+
+	return &c, nil
+}
+
+func ConfigFromFile(path string) (*Config, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	return ConfigFromReader(f)
+}
+
+func ConfigFromDefault() (*Config, error) {
+	var config *Config
+	defaultPaths := []string{
+		"ministream.toml",
+	}
+
+	for _, p := range defaultPaths {
+		c, err := ConfigFromFile(p)
+		if err != nil {
+			continue
+		}
+		config = c
+		break
+	}
+
+	if config == nil {
+		config = DefaultConfig()
+	}
+
+	return config, nil
+}

server/config_test.go

@@ -0,0 +1,37 @@
+package server_test
+
+import (
+	"strings"
+	"testing"
+
+	"git.t-juice.club/torjus/ministream/server"
+)
+
+func TestConfig(t *testing.T) {
+	t.Run("FromReader", func(t *testing.T) {
+		configString := `SiteName = "ministream.example.org"`
+		expectedSiteName := "ministream.example.org"
+		r := strings.NewReader(configString)
+
+		c, err := server.ConfigFromReader(r)
+		if err != nil {
+			t.Fatalf("Error reading config: %s", err)
+		}
+
+		if c.SiteName != expectedSiteName {
+			t.Errorf("SiteName incorrect. Got %s want %s", c.SiteName, expectedSiteName)
+		}
+	})
+	t.Run("OverrideFromEnv", func(t *testing.T) {
+		c := server.DefaultConfig()
+		expectedSiteName := "ms.example.org"
+
+		t.Setenv("MINISTREAM_SITENAME", expectedSiteName)
+
+		c.OverrideFromEnv()
+
+		if c.SiteName != expectedSiteName {
+			t.Errorf("SiteName incorrect. Got %s want %s", c.SiteName, expectedSiteName)
+		}
+	})
+}

server/server.go

@@ -19,15 +19,15 @@ import (
 var static embed.FS
 
 type Server struct {
-	users   *UserStore
 	streams *StreamStore
+	config  *Config
 	http.Server
 }
 
-func NewServer(store *UserStore) *Server {
+func NewServer(config *Config) *Server {
 	srv := &Server{
-		users:   store,
+		streams: NewStreamStore(config),
-		streams: NewStreamStore(),
+		config:  config,
 	}
 
 	r := chi.NewRouter()
@@ -41,6 +41,7 @@ func NewServer(store *UserStore) *Server {
 	r.Patch("/whip/{streamKey}", srv.PatchHandler)
 	r.Post("/whip/{streamKey}", srv.PostOfferHandler)
 	r.Get("/stats", srv.streams.StatsHandler)
+	r.Get("/api/siteinfo", srv.InfoHandler)
 
 	srv.Handler = r
 
@@ -55,6 +56,17 @@ func corsMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(fn)
 }
 
+func (s *Server) InfoHandler(w http.ResponseWriter, r *http.Request) {
+	var infoResponse struct {
+		SiteName string `json:"siteName"`
+	}
+	infoResponse.SiteName = s.config.SiteName
+
+	if err := json.NewEncoder(w).Encode(&infoResponse); err != nil {
+		slog.Warn("Error writing info response")
+	}
+}
+
 func (s *Server) OptionsHandler(w http.ResponseWriter, r *http.Request) {
 	slog.Info("Got OPTIONS")
 }

server/stream.go

@@ -20,19 +20,23 @@ var ErrNoSuchStream error = fmt.Errorf("no such stream")
 
 type StreamStore struct {
 	Streams map[string]*Stream
+
+	config       *Config
 	webRTCConfig webrtc.Configuration
 	mu           sync.Mutex
 }
 
-func NewStreamStore() *StreamStore {
+func NewStreamStore(config *Config) *StreamStore {
 	s := &StreamStore{
 		Streams: make(map[string]*Stream),
+		config:  config,
 	}
 
 	return s
 }
 
 type Stream struct {
+	store                 *StreamStore
 	peerConnection        *webrtc.PeerConnection
 	peerConnectionStats   map[string]*stats.Stats
 	peerConnectionStatsMu sync.Mutex
@@ -96,7 +100,10 @@ func (s *Stream) AddListener(sd *webrtc.SessionDescription) (*webrtc.SessionDesc
 	//i.Add(statsInterceptorFactory)
 
 	se := webrtc.SettingEngine{}
-	_ = se.SetEphemeralUDPPortRange(50000, 50050)
+	_ = se.SetEphemeralUDPPortRange(
+		uint16(s.store.config.WebRTC.UDPMin),
+		uint16(s.store.config.WebRTC.UDPMax),
+	)
 
 	webRTCConfig := webrtc.Configuration{
 		ICEServers: []webrtc.ICEServer{
@@ -179,6 +186,7 @@ func (s *StreamStore) Add(streamKey string, sd *webrtc.SessionDescription) (*web
 
 	go func() {
 		stream := &Stream{
+			store:               s,
 			lastUpdate:          time.Now(),
 			peerConnectionStats: make(map[string]*stats.Stats),
 		}
@@ -226,7 +234,7 @@ func (s *StreamStore) Add(streamKey string, sd *webrtc.SessionDescription) (*web
 			},
 		}
 		se := webrtc.SettingEngine{}
-		_ = se.SetEphemeralUDPPortRange(50000, 50050)
+		_ = se.SetEphemeralUDPPortRange(uint16(s.config.WebRTC.UDPMin), uint16(s.config.WebRTC.UDPMax))
 
 		// se.BufferFactory = func(packetType packetio.BufferPacketType, ssrc uint32) io.ReadWriteCloser {
 		// 	buf := packetio.NewBuffer()