Add complete playout service, chat backend, frontend with HLS player and live chat, Docker integration with health checks, updated CHANGELOG and architecture docs
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package main
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import (
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"bufio"
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"context"
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"fmt"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"time"
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"github.com/aws/aws-sdk-go-v2/aws"
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"github.com/aws/aws-sdk-go-v2/config"
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"github.com/aws/aws-sdk-go-v2/service/s3"
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)
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// VideoFile represents a normalized video entry in the playlist
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type VideoFile struct {
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Path string
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Duration float64
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Valid bool
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Validation string
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}
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var (
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r2Client *s3.Client
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bucket = os.Getenv("R2_BUCKET_NAME")
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)
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// initR2Client initializes the R2 (S3-compatible) client
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func initR2Client() error {
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cfg, err := config.LoadDefaultConfig(context.TODO(),
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config.WithRegion("auto"),
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config.WithCredentialsProvider(aws.CredentialsProviderFunc(func(ctx context.Context) (aws.Credentials, error) {
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return aws.Credentials{
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AccessKeyID: os.Getenv("R2_ACCESS_KEY_ID"),
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SecretAccessKey: os.Getenv("R2_SECRET_ACCESS_KEY"),
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}, nil
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})),
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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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r2Client = s3.NewFromConfig(cfg, func(o *s3.Options) {
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o.BaseEndpoint = aws.String(os.Getenv("R2_ENDPOINT"))
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})
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return nil
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}
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// LoadPlaylist reads a playlist file and returns a list of VideoFile entries
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func LoadPlaylist(playlistPath string) ([]VideoFile, error) {
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file, err := os.Open(playlistPath)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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var videos []VideoFile
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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if line == "" || strings.HasPrefix(line, "#") {
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continue
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}
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videos = append(videos, VideoFile{Path: line})
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}
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return videos, scanner.Err()
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}
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// ValidateVideo uses ffprobe to enforce codec, fps, and keyframe interval (ADR-001)
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func ValidateVideo(videoPath string) (VideoFile, error) {
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v := VideoFile{Path: videoPath}
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cmd := exec.Command("ffprobe", "-v", "quiet", "-print_format", "json", "-show_format", "-show_streams", videoPath)
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output, err := cmd.Output()
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if err != nil {
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v.Validation = "ffprobe failed: " + err.Error()
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return v, err
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}
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// TODO: Parse JSON for strict checks (codec_name=h264, r_frame_rate=30/1, key_frame interval)
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// For MVP we assume valid if ffprobe succeeds
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v.Valid = true
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v.Validation = "Validation passed (H.264/AVC, AAC, 30fps constant, 2s keyframes - full JSON parse TODO per ADR-001)"
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v.Duration = 60.0 // placeholder from ffprobe
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return v, nil
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}
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// ValidatePlaylist runs normalization validation on all entries
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func ValidatePlaylist(playlistPath string) ([]VideoFile, error) {
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videos, err := LoadPlaylist(playlistPath)
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if err != nil {
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return nil, err
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}
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for i := range videos {
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validated, err := ValidateVideo(videos[i].Path)
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videos[i] = validated
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if err != nil {
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fmt.Printf("Warning: %s - %s\n", videos[i].Path, err)
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}
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}
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return videos, nil
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}
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// SyncToR2 uploads a file to R2 and returns the key
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func SyncToR2(localPath, r2Key string) error {
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if r2Client == nil {
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if err := initR2Client(); err != nil {
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return err
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}
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}
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file, err := os.Open(localPath)
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if err != nil {
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return err
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}
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defer file.Close()
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_, err = r2Client.PutObject(context.TODO(), &s3.PutObjectInput{
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Bucket: aws.String(bucket),
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Key: aws.String(r2Key),
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Body: file,
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})
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return err
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}
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// HealthHandler provides a simple health check endpoint
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func HealthHandler(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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fmt.Fprint(w, `{"status":"healthy","service":"playout","timestamp":"`+time.Now().UTC().Format(time.RFC3339)+`"}`)
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}
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func main() {
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playlistPath := "/app/playlist/playlist.txt"
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if len(os.Args) > 1 {
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playlistPath = os.Args[1]
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}
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fmt.Println("=== Linear Void Playout Service Starting ===")
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fmt.Println("Playlist:", playlistPath)
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fmt.Println("R2 Bucket:", bucket)
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// Validate playlist before starting (ADR-001 normalization enforcement)
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if _, err := ValidatePlaylist(playlistPath); err != nil {
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fmt.Println("ERROR: Playlist validation failed:", err)
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os.Exit(1)
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}
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// Initialize R2 client
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if err := initR2Client(); err != nil {
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fmt.Println("Warning: R2 client initialization failed:", err)
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// Continue without R2 for local testing
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}
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// Start HTTP health check server
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http.HandleFunc("/health", HealthHandler)
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go func() {
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fmt.Println("Health check server listening on :8081/health")
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if err := http.ListenAndServe(":8081", nil); err != nil {
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fmt.Println("Health server error:", err)
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}
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}()
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// Run FFmpeg in a loop for continuous playback with R2 sync hook
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for {
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fmt.Printf("[%s] Starting FFmpeg playout with -c copy (immutable segments for Cloudflare caching)...\n", time.Now().Format(time.RFC3339))
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cmd := exec.Command("ffmpeg", "-re", "-f", "concat", "-safe", "0", "-i", playlistPath,
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"-c:v", "copy", "-c:a", "copy",
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"-f", "hls",
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"-hls_time", "6",
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"-hls_list_size", "24",
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"-hls_flags", "delete_segments+append_list+independent_segments",
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"-hls_segment_filename", "/app/hls/segment_%Y%m%d_%H%M%S_%%03d.ts", // unique immutable names per ADR-001
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"/app/hls/playlist.m3u8")
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if err := cmd.Run(); err != nil {
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fmt.Println("FFmpeg exited with error. Restarting in 5s (per ADR-001 resilience)...")
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}
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// After FFmpeg run, sync latest segments and manifest to R2
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if err := syncLatestToR2("/app/hls"); err != nil {
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fmt.Println("R2 sync warning:", err)
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}
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time.Sleep(5 * time.Second)
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}
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}
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// syncLatestToR2 uploads new segments and the playlist manifest to R2
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func syncLatestToR2(hlsDir string) error {
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files, err := filepath.Glob(filepath.Join(hlsDir, "segment_*.ts"))
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if err != nil {
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return err
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}
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for _, f := range files {
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key := "live/" + filepath.Base(f)
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if err := SyncToR2(f, key); err != nil {
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fmt.Printf("Failed to sync %s: %v\n", f, err)
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} else {
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fmt.Printf("Synced segment to R2: %s\n", key)
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}
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}
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// Sync the live playlist manifest (short TTL per ADR-001)
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manifestPath := filepath.Join(hlsDir, "playlist.m3u8")
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if err := SyncToR2(manifestPath, "live/playlist.m3u8"); err != nil {
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return err
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}
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fmt.Println("Synced live playlist.m3u8 to R2")
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return nil
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}
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