feat: config

.gitignore

@@ -1 +1,2 @@
+/config.yml
 /termstream.log

config/config.go

@@ -0,0 +1,80 @@
+package config
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+const defaultLogFile = "termstream.log"
+
+// Destination holds the configuration for a destination.
+type Destination struct {
+	URL string `yaml:"url"`
+}
+
+// Config holds the configuration for the application.
+type Config struct {
+	LogFile      string        `yaml:"logfile"`
+	Destinations []Destination `yaml:"destinations"`
+}
+
+// FromFile returns a reader for the default configuration file.
+func FromFile() io.Reader {
+	r, err := os.Open("config.yml")
+	if err != nil {
+		return bytes.NewReader([]byte{})
+	}
+
+	return r
+}
+
+// Default returns a reader for the default configuration.
+func Default() io.Reader {
+	return bytes.NewReader([]byte(nil))
+}
+
+// Load loads the configuration from the given reader.
+//
+// Passing an empty reader will load the default configuration.
+func Load(r io.Reader) (cfg Config, _ error) {
+	filePayload, err := io.ReadAll(r)
+	if err != nil {
+		return cfg, fmt.Errorf("read file: %w", err)
+	}
+
+	if err = yaml.Unmarshal(filePayload, &cfg); err != nil {
+		return cfg, fmt.Errorf("unmarshal: %w", err)
+	}
+
+	setDefaults(&cfg)
+
+	if err = validate(cfg); err != nil {
+		return cfg, err
+	}
+
+	return cfg, nil
+}
+
+func setDefaults(cfg *Config) {
+	if cfg.LogFile == "" {
+		cfg.LogFile = defaultLogFile
+	}
+}
+
+func validate(cfg Config) error {
+	var err error
+
+	for _, dest := range cfg.Destinations {
+		if !strings.HasPrefix(dest.URL, "rtmp://") {
+			err = errors.Join(err, fmt.Errorf("destination URL must start with rtmp://"))
+		}
+	}
+
+	return err
+}

config/config_test.go

@@ -0,0 +1,85 @@
+package config_test
+
+import (
+	"bytes"
+	_ "embed"
+	"io"
+	"testing"
+
+	"git.netflux.io/rob/termstream/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+//go:embed testdata/complete.yml
+var configComplete []byte
+
+//go:embed testdata/no-logfile.yml
+var configNoLogfile []byte
+
+//go:embed testdata/invalid-destination-url.yml
+var configInvalidDestinationURL []byte
+
+//go:embed testdata/multiple-invalid-destination-urls.yml
+var configMultipleInvalidDestinationURLs []byte
+
+func TestConfig(t *testing.T) {
+	testCases := []struct {
+		name    string
+		r       io.Reader
+		want    func(*testing.T, config.Config)
+		wantErr string
+	}{
+		{
+			name: "complete",
+			r:    bytes.NewReader(configComplete),
+			want: func(t *testing.T, cfg config.Config) {
+				require.Equal(
+					t,
+					config.Config{
+						LogFile: "test.log",
+						Destinations: []config.Destination{
+							{URL: "rtmp://rtmp.example.com:1935/live"},
+						},
+					}, cfg)
+			},
+		},
+		{
+			name: "no logfile",
+			r:    bytes.NewReader(configNoLogfile),
+			want: func(t *testing.T, cfg config.Config) {
+				assert.Equal(t, "termstream.log", cfg.LogFile)
+			},
+		},
+		{
+			name:    "invalid destination URL",
+			r:       bytes.NewReader(configInvalidDestinationURL),
+			wantErr: "destination URL must start with rtmp://",
+		},
+		{
+			name:    "multiple invalid destination URLs",
+			r:       bytes.NewReader(configMultipleInvalidDestinationURLs),
+			wantErr: "destination URL must start with rtmp://\ndestination URL must start with rtmp://",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			cfg, err := config.Load(tc.r)
+
+			if tc.wantErr == "" {
+				require.NoError(t, err)
+				tc.want(t, cfg)
+			} else {
+				assert.EqualError(t, err, tc.wantErr)
+			}
+		})
+	}
+}
+
+func TestConfigDefault(t *testing.T) {
+	cfg, err := config.Load(config.Default())
+	require.NoError(t, err)
+	assert.Equal(t, "termstream.log", cfg.LogFile)
+	assert.Empty(t, cfg.Destinations)
+}

config/testdata/complete.yml

@@ -0,0 +1,4 @@
+---
+logfile: test.log
+destinations:
+- url: rtmp://rtmp.example.com:1935/live

config/testdata/invalid-destination-url.yml

@@ -0,0 +1,4 @@
+---
+logfile: test.log
+destinations:
+- url: http://nope.example.com:443/live

config/testdata/multiple-invalid-destination-urls.yml

@@ -0,0 +1,4 @@
+---
+destinations:
+- url: http://nope1.example.com:443/live
+- url: http://nope2.example.com:443/live

config/testdata/no-logfile.yml

@@ -0,0 +1,3 @@
+---
+destinations:
+- url: rtmp://rtmp.example.com:1935/live

domain/types.go

@@ -5,4 +5,10 @@ type AppState struct {
 	ContainerRunning bool
 	IngressLive      bool
 	IngressURL       string
+	Destinations     []Destination
+}
+
+// Destination is a single destination.
+type Destination struct {
+	URL string
 }

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/rivo/tview v0.0.0-20241227133733-17b7edb88c57
 	github.com/stretchr/testify v1.10.0
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
@@ -43,6 +44,5 @@ require (
 	golang.org/x/term v0.17.0 // indirect
 	golang.org/x/text v0.21.0 // indirect
 	golang.org/x/time v0.9.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 	gotest.tools/v3 v3.5.1 // indirect
 )

main.go

@@ -3,9 +3,11 @@ package main
 import (
 	"context"
 	"fmt"
+	"io"
 	"log/slog"
 	"os"
 
+	"git.netflux.io/rob/termstream/config"
 	"git.netflux.io/rob/termstream/container"
 	"git.netflux.io/rob/termstream/domain"
 	"git.netflux.io/rob/termstream/mediaserver"
@@ -16,19 +18,26 @@ func main() {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	if err := run(ctx); err != nil {
+	if err := run(ctx, config.FromFile()); err != nil {
 		_, _ = os.Stderr.WriteString("Error: " + err.Error() + "\n")
 	}
 }
 
-func run(ctx context.Context) error {
+func run(ctx context.Context, cfgReader io.Reader) error {
+	cfg, err := config.Load(cfgReader)
+	if err != nil {
+		return fmt.Errorf("load config: %w", err)
+	}
+
 	state := new(domain.AppState)
+	applyConfig(cfg, state)
 
 	logFile, err := os.OpenFile("termstream.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
 	if err != nil {
 		return fmt.Errorf("error opening log file: %w", err)
 	}
 	logger := slog.New(slog.NewTextHandler(logFile, nil))
+	logger.Info("Starting termstream", slog.Any("initial_state", state))
 
 	runner, err := container.NewRunner(logger.With("component", "runner"))
 	if err != nil {
@@ -56,9 +65,12 @@ func run(ctx context.Context) error {
 
 	for {
 		select {
-		case <-ui.C():
+		case cmd, ok := <-ui.C():
+			logger.Info("Command received", "cmd", cmd)
+			if !ok {
 				logger.Info("UI closed")
 				return nil
+			}
 		case serverState, ok := <-srv.C():
 			if ok {
 				applyServerState(serverState, state)
@@ -71,8 +83,17 @@ func run(ctx context.Context) error {
 	}
 }
 
+// applyServerState applies the current server state to the app state.
 func applyServerState(serverState mediaserver.State, appState *domain.AppState) {
 	appState.ContainerRunning = serverState.ContainerRunning
 	appState.IngressLive = serverState.IngressLive
 	appState.IngressURL = serverState.IngressURL
 }
+
+// applyConfig applies the configuration to the app state.
+func applyConfig(cfg config.Config, appState *domain.AppState) {
+	appState.Destinations = make([]domain.Destination, 0, len(cfg.Destinations))
+	for _, dest := range cfg.Destinations {
+		appState.Destinations = append(appState.Destinations, domain.Destination{URL: dest.URL})
+	}
+}

terminal/actor.go

@@ -11,19 +11,20 @@ import (
 	"github.com/rivo/tview"
 )
 
-const defaultChanSize = 64
-
-type action func()
-
 // Actor is responsible for managing the terminal user interface.
 type Actor struct {
 	app       *tview.Application
 	ch        chan action
-	doneCh    chan struct{}
+	commandCh chan Command
 	logger    *slog.Logger
 	serverBox *tview.TextView
+	destBox   *tview.Table
 }
 
+const defaultChanSize = 64
+
+type action func()
+
 // StartActorParams contains the parameters for starting a new terminal user
 // interface.
 type StartActorParams struct {
@@ -34,6 +35,8 @@ type StartActorParams struct {
 // StartActor starts the terminal user interface actor.
 func StartActor(ctx context.Context, params StartActorParams) (*Actor, error) {
 	chanSize := cmp.Or(params.ChanSize, defaultChanSize)
+	ch := make(chan action, chanSize)
+	commandCh := make(chan Command, chanSize)
 
 	app := tview.NewApplication()
 	serverBox := tview.NewTextView()
@@ -42,9 +45,15 @@ func StartActor(ctx context.Context, params StartActorParams) (*Actor, error) {
 	serverBox.SetTitle("media server")
 	serverBox.SetTextAlign(tview.AlignCenter)
 
-	destBox := tview.NewBox().
+	destBox := tview.NewTable()
-		SetBorder(true).
+	destBox.SetTitle("destinations")
-		SetTitle("destinations")
+	destBox.SetBorder(true)
+	destBox.SetSelectable(true, false)
+	destBox.SetWrapSelection(true, false)
+	destBox.SetDoneFunc(func(key tcell.Key) {
+		row, _ := destBox.GetSelection()
+		commandCh <- CommandToggleDestination{URL: destBox.GetCell(row, 0).Text}
+	})
 
 	flex := tview.NewFlex().
 		SetDirection(tview.FlexRow).
@@ -58,38 +67,43 @@ func StartActor(ctx context.Context, params StartActorParams) (*Actor, error) {
 		AddItem(nil, 0, 1, false)
 
 	app.SetRoot(container, true)
-	app.EnableMouse(true)
+	app.SetFocus(destBox)
+	app.EnableMouse(false)
+
+	actor := &Actor{
+		ch:        ch,
+		commandCh: commandCh,
+		logger:    params.Logger,
+		app:       app,
+		serverBox: serverBox,
+		destBox:   destBox,
+	}
+
 	app.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
-		if event.Key() == tcell.KeyCtrlC {
+		switch event.Key() {
+		case tcell.KeyCtrlC:
 			app.Stop()
 			return nil
 		}
 
 		return event
 	})
-
-	actor := &Actor{
-		ch:        make(chan action, chanSize),
-		doneCh:    make(chan struct{}, 1),
-		logger:    params.Logger,
-		app:       app,
-		serverBox: serverBox,
-	}
-
 	go actor.actorLoop(ctx)
 
 	return actor, nil
 }
 
-// C returns a channel that is closed when the terminal user interface closes.
+// C returns a channel that receives commands from the user interface.
-func (a *Actor) C() <-chan struct{} {
+func (a *Actor) C() <-chan Command {
-	return a.doneCh
+	return a.commandCh
 }
 
 func (a *Actor) actorLoop(ctx context.Context) {
 	uiDone := make(chan struct{})
 	go func() {
-		defer close(uiDone)
+		defer func() {
+			uiDone <- struct{}{}
+		}()
 
 		if err := a.app.Run(); err != nil {
 			a.logger.Error("tui application error", "err", err)
@@ -101,7 +115,7 @@ func (a *Actor) actorLoop(ctx context.Context) {
 		case <-ctx.Done():
 			a.logger.Info("Context done")
 		case <-uiDone:
-			a.doneCh <- struct{}{}
+			close(a.commandCh)
 		case action, ok := <-a.ch:
 			if !ok {
 				return
@@ -120,6 +134,19 @@ func (a *Actor) SetState(state domain.AppState) {
 
 func (a *Actor) redrawFromState(state domain.AppState) {
 	a.serverBox.SetText(generateServerStatus(state))
+
+	a.destBox.Clear()
+
+	a.destBox.SetCell(0, 0, tview.NewTableCell("[grey]URL").SetAlign(tview.AlignLeft).SetExpansion(7).SetSelectable(false))
+	a.destBox.SetCell(0, 1, tview.NewTableCell("[grey]Status").SetAlign(tview.AlignLeft).SetExpansion(1).SetSelectable(false))
+	a.destBox.SetCell(0, 2, tview.NewTableCell("[grey]Actions").SetAlign(tview.AlignLeft).SetExpansion(2).SetSelectable(false))
+
+	for i, dest := range state.Destinations {
+		a.destBox.SetCell(i+1, 0, tview.NewTableCell(dest.URL))
+		a.destBox.SetCell(i+1, 1, tview.NewTableCell("[yellow]off-air"))
+		a.destBox.SetCell(i+1, 2, tview.NewTableCell("[green]Tab to go live"))
+	}
+
 	a.app.Draw()
 }
 

terminal/command.go

@@ -0,0 +1,18 @@
+package terminal
+
+// CommandToggleDestination toggles a destination from on-air to off-air, or
+// vice versa.
+type CommandToggleDestination struct {
+	URL string
+}
+
+// Name implements the Command interface.
+func (c CommandToggleDestination) Name() string {
+	return "toggle_destination"
+}
+
+// Command is an interface for commands that can be triggered by the terminal
+// user interface.
+type Command interface {
+	Name() string
+}