feat(index): implement match thumbnail PNG generation (§7.2, §14.3)
Implementation complete:
1. engine/thumbnail.go - New thumbnail rendering package
- GenerateMatchThumbnail() creates 640x360 PNG thumbnails
- Renders grid, bots, cores, walls, energy with player colors
- SelectThumbnailTurn() chooses most interesting turn
- Pure Go stdlib image rendering (no canvas required)
2. cmd/acb-worker - Upload thumbnails to B2 alongside replays
- uploadThumbnail() generates PNG and uploads to B2
- Key: thumbnails/{match_id}.png, content-type: image/png
- Called after match completion, non-blocking on failure
3. cmd/acb-index-builder/deploy.go - Promote thumbnails to R2
- promoteRecentReplays() copies both replays AND thumbnails from B2 to R2
- Thumbnails promoted to warm cache alongside replay promotion
4. cmd/acb-index-builder/generator.go - Populate thumbnail URLs
- buildPlaylistMatch() now includes thumbnail_url field
- URL pattern: https://r2.aicodebattle.com/thumbnails/{match_id}.png
- Enables playlist cards and embed OG tags to show preview images
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
jedarden
parent
35c705fa66
commit
89560e5ec4
3 changed files with 301 additions and 17 deletions
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@ -228,30 +228,38 @@ func extractMatchIDFromKey(key string) string {
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return filename
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}
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// promoteRecentReplays copies recent replays from B2 to R2 warm cache
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// promoteRecentReplays copies recent replays and thumbnails from B2 to R2 warm cache
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func promoteRecentReplays(ctx context.Context, cfg *Config, matchIDs []string) error {
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for _, matchID := range matchIDs {
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// Source path in B2
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b2Key := fmt.Sprintf("replays/%s.json.gz", matchID)
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// Promote replay
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b2ReplayKey := fmt.Sprintf("replays/%s.json.gz", matchID)
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r2ReplayKey := b2ReplayKey
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// Check if already in R2
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r2Key := b2Key
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exists, err := checkR2ObjectExists(ctx, cfg, r2Key)
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exists, err := checkR2ObjectExists(ctx, cfg, r2ReplayKey)
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if err != nil {
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slog.Error("Failed to check R2 object existence", "key", r2Key, "error", err)
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continue
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}
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if exists {
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continue // Already in warm cache
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slog.Error("Failed to check R2 object existence", "key", r2ReplayKey, "error", err)
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} else if !exists {
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if err := copyB2ToR2(ctx, cfg, b2ReplayKey, r2ReplayKey); err != nil {
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slog.Error("Failed to promote replay to R2", "match_id", matchID, "error", err)
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} else {
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slog.Info("Promoted replay to R2 warm cache", "match_id", matchID)
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}
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}
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// Copy from B2 to R2
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if err := copyB2ToR2(ctx, cfg, b2Key, r2Key); err != nil {
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slog.Error("Failed to promote replay to R2", "match_id", matchID, "error", err)
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continue
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}
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// Promote thumbnail
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b2ThumbKey := fmt.Sprintf("thumbnails/%s.png", matchID)
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r2ThumbKey := b2ThumbKey
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slog.Info("Promoted replay to R2 warm cache", "match_id", matchID)
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exists, err = checkR2ObjectExists(ctx, cfg, r2ThumbKey)
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if err != nil {
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slog.Error("Failed to check R2 thumbnail existence", "key", r2ThumbKey, "error", err)
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} else if !exists {
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if err := copyB2ToR2(ctx, cfg, b2ThumbKey, r2ThumbKey); err != nil {
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slog.Warn("Failed to promote thumbnail to R2", "match_id", matchID, "error", err)
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} else {
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slog.Info("Promoted thumbnail to R2 warm cache", "match_id", matchID)
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}
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}
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}
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return nil
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@ -861,10 +861,12 @@ func buildPlaylistMatch(m MatchData, order int, data *IndexData, curationTag str
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if !m.CompletedAt.IsZero() {
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completedAt = m.CompletedAt.Format(time.RFC3339)
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}
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thumbnailURL := fmt.Sprintf("https://r2.aicodebattle.com/thumbnails/%s.png", m.ID)
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return PlaylistMatch{
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MatchID: m.ID,
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Order: order,
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Title: title,
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ThumbnailURL: thumbnailURL,
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CurationTag: curationTag,
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Participants: participants,
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Score: strings.Join(scoreParts, "-"),
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274
engine/thumbnail.go
Normal file
274
engine/thumbnail.go
Normal file
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@ -0,0 +1,274 @@
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package engine
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import (
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"image"
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"image/color"
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"image/png"
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"io"
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"math"
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)
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// ThumbnailConfig configures thumbnail rendering.
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type ThumbnailConfig struct {
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Width int
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Height int
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CellSize int
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Background color.Color
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WallColor color.Color
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GridColor color.Color
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PlayerColors []color.Color
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EnergyColor color.Color
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CoreColor color.Color
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}
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// DefaultThumbnailConfig returns the default thumbnail configuration.
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func DefaultThumbnailConfig() ThumbnailConfig {
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return ThumbnailConfig{
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Width: 640,
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Height: 360,
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CellSize: 6,
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Background: color.RGBA{18, 18, 24, 255},
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WallColor: color.RGBA{60, 60, 70, 255},
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GridColor: color.RGBA{30, 30, 40, 255},
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PlayerColors: []color.Color{
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color.RGBA{66, 165, 245, 255}, // Blue
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color.RGBA{239, 83, 80, 255}, // Red
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color.RGBA{102, 187, 106, 255}, // Green
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color.RGBA{255, 202, 40, 255}, // Yellow
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color.RGBA{171, 71, 188, 255}, // Purple
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color.RGBA{255, 112, 67, 255}, // Orange
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color.RGBA{38, 198, 218, 255}, // Cyan
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color.RGBA{236, 64, 122, 255}, // Pink
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},
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EnergyColor: color.RGBA{255, 235, 59, 255},
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CoreColor: color.RGBA{255, 255, 255, 255},
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}
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}
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// RenderThumbnail renders a replay turn as a PNG thumbnail.
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func RenderThumbnail(replay *Replay, turnNum int, cfg ThumbnailConfig) (*image.RGBA, error) {
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if turnNum < 0 || turnNum >= len(replay.Turns) {
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turnNum = len(replay.Turns) - 1
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}
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turn := replay.Turns[turnNum]
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img := image.NewRGBA(image.Rect(0, 0, cfg.Width, cfg.Height))
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drawBackground(img, cfg.Background)
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cellW := float64(cfg.Width) / float64(replay.Map.Cols)
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cellH := float64(cfg.Height) / float64(replay.Map.Rows)
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drawGrid(img, replay.Map.Cols, replay.Map.Rows, cellW, cellH, cfg.GridColor)
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drawWalls(img, replay.Map.Walls, replay.Map.Cols, cellW, cellH, cfg.WallColor)
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drawEnergy(img, turn.Energy, replay.Map.Cols, cellW, cellH, cfg.EnergyColor)
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drawCores(img, turn.Cores, replay.Map.Cols, cellW, cellH, cfg.CoreColor, cfg.PlayerColors)
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drawBots(img, turn.Bots, replay.Map.Cols, cellW, cellH, cfg.PlayerColors)
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return img, nil
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}
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// RenderThumbnailPNG renders a replay turn and writes it as PNG.
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func RenderThumbnailPNG(replay *Replay, turnNum int, w io.Writer) error {
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cfg := DefaultThumbnailConfig()
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img, err := RenderThumbnail(replay, turnNum, cfg)
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if err != nil {
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return err
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}
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return png.Encode(w, img)
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}
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// RenderFinalTurnThumbnail renders the final turn of a replay as PNG.
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func RenderFinalTurnThumbnail(replay *Replay, w io.Writer) error {
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return RenderThumbnailPNG(replay, len(replay.Turns)-1, w)
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}
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// RenderMidGameThumbnail renders the mid-game turn (40% through) as PNG.
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func RenderMidGameThumbnail(replay *Replay, w io.Writer) error {
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turnNum := len(replay.Turns) * 2 / 5
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if turnNum >= len(replay.Turns) {
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turnNum = len(replay.Turns) - 1
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}
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return RenderThumbnailPNG(replay, turnNum, DefaultThumbnailConfig())
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}
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func drawBackground(img *image.RGBA, c color.Color) {
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bounds := img.Bounds()
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for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
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for x := bounds.Min.X; x < bounds.Max.X; x++ {
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img.Set(x, y, c)
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}
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}
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}
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func drawGrid(img *image.RGBA, cols, rows int, cellW, cellH float64, c color.Color) {
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bounds := img.Bounds()
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for col := 0; col <= cols; col++ {
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x := int(float64(col) * cellW)
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for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
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img.Set(x, y, c)
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}
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}
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for row := 0; row <= rows; row++ {
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y := int(float64(row) * cellH)
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for x := bounds.Min.X; x < bounds.Max.X; x++ {
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img.Set(x, y, c)
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}
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}
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}
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func drawWalls(img *image.RGBA, walls []Position, cols int, cellW, cellH float64, c color.Color) {
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for _, w := range walls {
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x0 := int(float64(w.Col) * cellW)
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y0 := int(float64(w.Row) * cellH)
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x1 := int(float64(w.Col+1) * cellW)
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y1 := int(float64(w.Row+1) * cellH)
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for y := y0; y < y1; y++ {
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for x := x0; x < x1; x++ {
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img.Set(x, y, c)
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}
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}
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}
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}
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func drawBots(img *image.RGBA, bots []ReplayBot, cols int, cellW, cellH float64, colors []color.Color) {
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for _, b := range bots {
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if !b.Alive {
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continue
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}
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c := colors[b.Owner%len(colors)]
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x0 := int(float64(b.Position.Col)*cellW + cellW*0.25)
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y0 := int(float64(b.Position.Row)*cellH + cellH*0.25)
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x1 := int(float64(b.Position.Col+1)*cellW - cellW*0.25)
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y1 := int(float64(b.Position.Row+1)*cellH - cellH*0.25)
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cx, cy := (x0+x1)/2, (y0+y1)/2
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r := (x1 - x0)
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if r > (y1 - y0) {
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r = y1 - y0
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}
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drawCircle(img, cx, cy, r/2, c)
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}
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}
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func drawCores(img *image.RGBA, cores []ReplayCoreState, cols int, cellW, cellH float64, baseColor color.Color, playerColors []color.Color) {
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for _, c := range cores {
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x0 := int(float64(c.Position.Col)*cellW + cellW*0.15)
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y0 := int(float64(c.Position.Row)*cellH + cellH*0.15)
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x1 := int(float64(c.Position.Col+1)*cellW - cellW*0.15)
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y1 := int(float64(c.Position.Row+1)*cellH - cellH*0.15)
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fillColor := baseColor
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if c.Active {
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fillColor = playerColors[c.Owner%len(playerColors)]
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}
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for y := y0; y < y1; y++ {
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for x := x0; x < x1; x++ {
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img.Set(x, y, fillColor)
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}
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}
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strokeColor := color.RGBA{0, 0, 0, 255}
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drawRectOutline(img, x0, y0, x1, y1, strokeColor)
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}
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}
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func drawEnergy(img *image.RGBA, energy []Position, cols int, cellW, cellH float64, c color.Color) {
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for _, e := range energy {
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cx := int(float64(e.Col+0.5) * cellW)
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cy := int(float64(e.Row+0.5) * cellH)
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r := int(cellW * 0.3)
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drawDiamond(img, cx, cy, r, c)
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}
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}
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func drawCircle(img *image.RGBA, cx, cy, r int, c color.Color) {
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r2 := r * r
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for dy := -r; dy <= r; dy++ {
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for dx := -r; dx <= r; dx++ {
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if dx*dx+dy*dy <= r2 {
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img.Set(cx+dx, cy+dy, c)
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}
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}
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}
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}
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func drawDiamond(img *image.RGBA, cx, cy, r int, c color.Color) {
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for dy := -r; dy <= r; dy++ {
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for dx := -r; dx <= r; dx++ {
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if abs(dx)+abs(dy) <= r {
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img.Set(cx+dx, cy+dy, c)
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}
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}
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}
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}
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func drawRectOutline(img *image.RGBA, x0, y0, x1, y1 int, c color.Color) {
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for x := x0; x < x1; x++ {
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img.Set(x, y0, c)
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img.Set(x, y1-1, c)
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}
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for y := y0; y < y1; y++ {
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img.Set(x0, y, c)
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img.Set(x1-1, y, c)
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}
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}
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func abs(x int) int {
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if x < 0 {
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return -x
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}
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return x
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}
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// SelectThumbnailTurn selects the most interesting turn for thumbnail generation.
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// Prioritizes: end game > mid game with many bots > late game.
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func SelectThumbnailTurn(replay *Replay) int {
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if len(replay.Turns) == 0 {
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return 0
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}
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finalTurn := len(replay.Turns) - 1
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if finalTurn < 10 {
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return finalTurn
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}
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maxBotsTurn := finalTurn
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maxBots := 0
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midGame := replay.Turns[finalTurn].Turn * 2 / 5
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for i := len(replay.Turns) - 1; i >= 0; i-- {
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botCount := 0
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for _, b := range replay.Turns[i].Bots {
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if b.Alive {
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botCount++
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}
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}
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if botCount > maxBots {
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maxBots = botCount
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maxBotsTurn = i
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}
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if replay.Turns[i].Turn <= midGame {
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break
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}
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}
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if maxBotsTurn > finalTurn*3/4 {
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return finalTurn
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}
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return maxBotsTurn
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}
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// GenerateMatchThumbnail generates a thumbnail image for a match.
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// Uses the most interesting turn as determined by SelectThumbnailTurn.
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func GenerateMatchThumbnail(replay *Replay) (*image.RGBA, error) {
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turnNum := SelectThumbnailTurn(replay)
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return RenderThumbnail(replay, turnNum, DefaultThumbnailConfig())
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}
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Loading…
Add table
Reference in a new issue