fix(device): Use configured network interface

gabe565 · Sep 11, 2023 · 9fd6541 · 9fd6541
1 parent 4bb37e2
commit 9fd6541
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Showing 5 changed files with 35 additions and 27 deletions.
diff --git a/cmd/cmd_test.go b/cmd/cmd_test.go
@@ -3,6 +3,7 @@ package cmd
 import (
 	"bytes"
 	"math/rand"
+	"net"
 	"os"
 	"strconv"
 	"testing"
@@ -19,6 +20,12 @@ func randDuration() time.Duration {
 	return time.Duration(randSecs) * time.Second
 }
 
+func getNetworkInterfaceName(t *testing.T) string {
+	interfaces, err := net.Interfaces()
+	assert.NoError(t, err)
+	return interfaces[0].Name
+}
+
 func TestFlags(t *testing.T) {
 	defer func() {
 		config.Reset()
@@ -27,6 +34,7 @@ func TestFlags(t *testing.T) {
 	discoverInterval := randDuration()
 	pausedInterval := randDuration()
 	playingInterval := randDuration()
+	networkInterface := getNetworkInterfaceName(t)
 
 	var cmd *cobra.Command
 	if !assert.NotPanics(t, func() {
@@ -36,7 +44,7 @@ func TestFlags(t *testing.T) {
 	}
 	cmd.SetArgs([]string{
 		"--log-level=debug",
-		"--network-interface=eno1",
+		"--network-interface=" + networkInterface,
 		"--discover-interval=" + discoverInterval.String(),
 		"--paused-interval=" + pausedInterval.String(),
 		"--playing-interval=" + playingInterval.String(),
@@ -52,7 +60,7 @@ func TestFlags(t *testing.T) {
 	}
 
 	assert.Equal(t, "debug", config.Default.LogLevel)
-	assert.Equal(t, "eno1", config.Default.NetworkInterface)
+	assert.Equal(t, networkInterface, config.Default.NetworkInterfaceName)
 	assert.Equal(t, discoverInterval, config.Default.DiscoverInterval)
 	assert.Equal(t, pausedInterval, config.Default.PausedInterval)
 	assert.Equal(t, playingInterval, config.Default.PlayingInterval)
@@ -70,6 +78,7 @@ func TestEnvs(t *testing.T) {
 	discoverInterval := randDuration()
 	pausedInterval := randDuration()
 	playingInterval := randDuration()
+	networkInterface := getNetworkInterfaceName(t)
 
 	defer func() {
 		_ = os.Unsetenv("CSS_LOG_LEVEL")
@@ -82,7 +91,7 @@ func TestEnvs(t *testing.T) {
 		_ = os.Unsetenv("CSS_MUTE_ADS")
 	}()
 	_ = os.Setenv("CSS_LOG_LEVEL", "warn")
-	_ = os.Setenv("CSS_NETWORK_INTERFACE", "eno1")
+	_ = os.Setenv("CSS_NETWORK_INTERFACE", networkInterface)
 	_ = os.Setenv("CSS_DISCOVER_INTERVAL", discoverInterval.String())
 	_ = os.Setenv("CSS_PAUSED_INTERVAL", pausedInterval.String())
 	_ = os.Setenv("CSS_PLAYING_INTERVAL", playingInterval.String())
@@ -104,7 +113,7 @@ func TestEnvs(t *testing.T) {
 	}
 
 	assert.Equal(t, "warn", config.Default.LogLevel)
-	assert.Equal(t, "eno1", config.Default.NetworkInterface)
+	assert.Equal(t, networkInterface, config.Default.NetworkInterfaceName)
 	assert.Equal(t, discoverInterval, config.Default.DiscoverInterval)
 	assert.Equal(t, pausedInterval, config.Default.PausedInterval)
 	assert.Equal(t, playingInterval, config.Default.PlayingInterval)

diff --git a/internal/config/config.go b/internal/config/config.go
@@ -2,6 +2,7 @@ package config
 
 import (
 	"fmt"
+	"net"
 	"strings"
 	"time"
 
@@ -24,7 +25,7 @@ func Reset() {
 		PlayingInterval:  500 * time.Millisecond,
 		SkipDelay:        0,
 
-		NetworkInterface: "",
+		NetworkInterface: nil,
 
 		Categories:  []string{"sponsor"},
 		ActionTypes: []string{"skip", "mute"},
@@ -44,7 +45,8 @@ type Config struct {
 	PlayingInterval  time.Duration `mapstructure:"playing-interval"`
 	SkipDelay        time.Duration `mapstructure:"skip-delay"`
 
-	NetworkInterface string `mapstructure:"network-interface"`
+	NetworkInterfaceName string `mapstructure:"network-interface"`
+	NetworkInterface     *net.Interface
 
 	Categories  []string
 	ActionTypes []string `mapstructure:"action-types"`
@@ -87,5 +89,16 @@ func (c *Config) Load() error {
 		}
 	}
 
-	return c.viper.Unmarshal(c)
+	if err := c.viper.Unmarshal(c); err != nil {
+		return err
+	}
+
+	if c.NetworkInterfaceName != "" {
+		var err error
+		if c.NetworkInterface, err = net.InterfaceByName(c.NetworkInterfaceName); err != nil {
+			return err
+		}
+	}
+
+	return nil
 }
diff --git a/internal/config/network.go b/internal/config/network.go
@@ -9,7 +9,7 @@ import (
 
 func (c *Config) RegisterNetworkInterface(cmd *cobra.Command) {
 	key := "network-interface"
-	cmd.PersistentFlags().StringP(key, "i", Default.NetworkInterface, "Network interface to use for multicast dns discovery. (default all interfaces)")
+	cmd.PersistentFlags().StringP(key, "i", Default.NetworkInterfaceName, "Network interface to use for multicast dns discovery. (default all interfaces)")
 	if err := c.viper.BindPFlag(key, cmd.PersistentFlags().Lookup(key)); err != nil {
 		panic(err)
 	}

diff --git a/internal/device/dns.go b/internal/device/dns.go
@@ -15,19 +15,10 @@ import (
 var ErrDeviceNotFound = errors.New("device not found")
 
 func DiscoverCastDNSEntryByUuid(ctx context.Context, uuid string) (castdns.CastEntry, error) {
-	var iface *net.Interface
-	if config.Default.NetworkInterface != "" {
-		var err error
-		iface, err = net.InterfaceByName(config.Default.NetworkInterface)
-		if err != nil {
-			return castdns.CastEntry{}, err
-		}
-	}
-
 	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
 	defer cancel()
 
-	entries, err := castdns.DiscoverCastDNSEntries(ctx, iface)
+	entries, err := castdns.DiscoverCastDNSEntries(ctx, config.Default.NetworkInterface)
 	if err != nil {
 		return castdns.CastEntry{}, err
 	}
@@ -64,14 +55,8 @@ func DiscoverCastDNSEntries(ctx context.Context, iface *net.Interface, ch chan c
 }
 
 func BeginDiscover(ctx context.Context) (<-chan castdns.CastEntry, error) {
-	var iface *net.Interface
-	if config.Default.NetworkInterface != "" {
-		var err error
-		iface, err = net.InterfaceByName(config.Default.NetworkInterface)
-		if err != nil {
-			return nil, err
-		}
-		slog.Info("Searching for devices...", "interface", config.Default.NetworkInterface)
+	if config.Default.NetworkInterface != nil {
+		slog.Info("Searching for devices...", "interface", config.Default.NetworkInterfaceName)
 	} else {
 		slog.Info("Searching for devices...")
 	}
@@ -87,7 +72,7 @@ func BeginDiscover(ctx context.Context) (<-chan castdns.CastEntry, error) {
 				return
 			}
 
-			if err := DiscoverCastDNSEntries(ctx, iface, ch); err != nil {
+			if err := DiscoverCastDNSEntries(ctx, config.Default.NetworkInterface, ch); err != nil {
 				slog.Error("Failed to discover devices.", "error", err.Error())
 				continue
 			}

diff --git a/internal/device/watch.go b/internal/device/watch.go
@@ -222,6 +222,7 @@ func (d *Device) connect(opts ...application.ApplicationOption) error {
 		opts,
 		application.WithSkipadSleep(config.Default.PlayingInterval),
 		application.WithSkipadRetries(int(time.Minute/config.Default.PlayingInterval)),
+		application.WithIface(config.Default.NetworkInterface),
 	)
 	d.app = application.NewApplication(opts...)
 	d.app.AddMessageFunc(d.onMessage)