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* Add broadcaster logic * Update db schema * Update tests * Fix tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| package api | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "log/slog" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/a-h/templ" | ||
| "github.com/gevulotnetwork/devnet-explorer/api/templates" | ||
| "github.com/gevulotnetwork/devnet-explorer/model" | ||
| ) | ||
|
|
||
| type Broadcaster struct { | ||
| s Store | ||
| clientsMu sync.Mutex | ||
| nextID uint64 | ||
| clients map[uint64]chan<- []byte | ||
| headIndex uint8 | ||
| head [50][]byte | ||
|
|
||
| done chan struct{} | ||
| } | ||
|
|
||
| func NewBroadcaster(s Store) *Broadcaster { | ||
| return &Broadcaster{ | ||
| s: s, | ||
| clients: make(map[uint64]chan<- []byte), | ||
| done: make(chan struct{}), | ||
| } | ||
| } | ||
|
|
||
| func (b *Broadcaster) subscribe() (data <-chan []byte, unsubscribe func()) { | ||
| b.clientsMu.Lock() | ||
| defer b.clientsMu.Unlock() | ||
|
|
||
| id := b.nextID | ||
| ch := make(chan []byte, len(b.head)+2) | ||
| b.clients[id] = ch | ||
| b.nextID++ | ||
| slog.Info("client subscribed", slog.Uint64("id", id)) | ||
|
|
||
| for i := 1; i <= len(b.head); i++ { | ||
| idx := (b.headIndex + uint8(i)) % uint8(len(b.head)) | ||
| if b.head[idx] != nil { | ||
| ch <- b.head[idx] | ||
| } | ||
| } | ||
|
|
||
| return ch, func() { | ||
| slog.Info("client unsubscribed", slog.Uint64("id", id)) | ||
| b.clientsMu.Lock() | ||
| defer b.clientsMu.Unlock() | ||
| delete(b.clients, id) | ||
| close(ch) | ||
| } | ||
| } | ||
|
|
||
| func (b *Broadcaster) Run() error { | ||
| t := time.NewTicker(time.Second * 2) | ||
| for { | ||
| var ev EventComponent | ||
| select { | ||
| case event, ok := <-b.s.Events(): | ||
| if !ok { | ||
| slog.Info("store.Events() channel closed, broadcasting stopped") | ||
| return nil | ||
| } | ||
| slog.Debug("new tx event received") | ||
| ev = TXRowEvent(event) | ||
| case <-t.C: | ||
| stats, err := b.s.Stats() | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get stats: %w", err) | ||
| } | ||
| slog.Debug("stats updated") | ||
| ev = StatEvent(stats) | ||
| case <-b.done: | ||
| return nil | ||
| } | ||
|
|
||
| buf := &bytes.Buffer{} | ||
| if err := writeEvent(buf, ev); err != nil { | ||
| slog.Error("failed write event into buffer", slog.Any("error", err)) | ||
| continue | ||
| } | ||
|
|
||
| b.broadcast(buf.Bytes()) | ||
| } | ||
| } | ||
|
|
||
| func (b *Broadcaster) broadcast(data []byte) { | ||
| b.clientsMu.Lock() | ||
| defer b.clientsMu.Unlock() | ||
| b.head[b.headIndex] = data | ||
| b.headIndex = (b.headIndex + 1) % uint8(len(b.head)) | ||
| for id, c := range b.clients { | ||
| select { | ||
| case c <- data: | ||
| slog.Debug("data broadcasted", slog.Uint64("id", id)) | ||
| default: | ||
| slog.Info("client blocked, broadcasting event skipped", slog.Uint64("id", id)) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (b *Broadcaster) Stop() error { | ||
| close(b.done) | ||
| return nil | ||
| } | ||
|
|
||
| type EventComponent struct { | ||
| templ.Component | ||
| name string | ||
| } | ||
|
|
||
| func (e EventComponent) Name() string { | ||
| return e.name | ||
| } | ||
|
|
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| func TXRowEvent(e model.Event) EventComponent { | ||
| return EventComponent{ | ||
| Component: templates.Row(e), | ||
| name: templates.EventTXRow, | ||
| } | ||
| } | ||
|
|
||
| func StatEvent(s model.Stats) EventComponent { | ||
| return EventComponent{ | ||
| Component: templates.Stats(s), | ||
| name: templates.EventStats, | ||
| } | ||
| } | ||
|
|
||
| func writeEvent(w io.Writer, c EventComponent) error { | ||
| fmt.Fprintf(w, "event: %s\ndata: ", c.Name()) | ||
| if err := c.Render(context.Background(), w); err != nil { | ||
| return fmt.Errorf("failed render html: %w", err) | ||
| } | ||
| fmt.Fprint(w, "\n\n") | ||
| return nil | ||
| } |
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