Created
June 14, 2025 09:45
-
-
Save blinkinglight/e7984e75b2961b6bbdd6af73de34bf69 to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package replayhandler | |
| import ( | |
| "context" | |
| "fmt" | |
| "log" | |
| "time" | |
| "github.com/ituoga/iot/gen" | |
| "github.com/nats-io/nats.go" | |
| "google.golang.org/protobuf/proto" | |
| ) | |
| // interface | |
| type ReplayHandler interface { | |
| ApplyEvent(m *gen.EventEnvelope) error | |
| ApplyCommand(ctx context.Context, m *gen.CommandEnvelope) ([]*gen.EventEnvelope, error) | |
| } | |
| func Replay(ctx context.Context, js nats.JetStreamContext, aggregate, id string, fn ReplayHandler) { | |
| lctx, cancel := context.WithCancel(ctx) | |
| msgs := make(chan *nats.Msg, 128) | |
| sub, _ := js.ChanSubscribe(fmt.Sprintf("events.%s.%s.>", aggregate, id), msgs, nats.DeliverAll(), nats.ManualAck()) | |
| defer close(msgs) | |
| defer sub.Unsubscribe() | |
| delay := 1000 * time.Millisecond | |
| go func() { | |
| waiter := time.NewTimer(delay) | |
| for { | |
| select { | |
| case <-ctx.Done(): | |
| cancel() | |
| return | |
| case <-waiter.C: | |
| cancel() | |
| return | |
| case msg := <-msgs: | |
| waiter.Reset(200 * time.Second) | |
| if msg == nil { | |
| continue | |
| } | |
| var event = &gen.EventEnvelope{} | |
| err := proto.Unmarshal(msg.Data, event) | |
| if err != nil { | |
| log.Printf("Replay handler error: %v", err) | |
| } | |
| fn.ApplyEvent(event) | |
| msg.Ack() | |
| } | |
| } | |
| }() | |
| <-lctx.Done() | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment