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internal/robot/reconnect.go

@@ -0,0 +1,38 @@
+package robot
+
+import (
+	"context"
+	"time"
+)
+
+const (
+	reconnectInitial = 5 * time.Second
+	reconnectMax     = 60 * time.Second
+)
+
+func waitReconnect(ctx context.Context, backoff *time.Duration) bool {
+	if ctx.Err() != nil {
+		return false
+	}
+	select {
+	case <-ctx.Done():
+		return false
+	case <-time.After(*backoff):
+		if *backoff < reconnectMax {
+			*backoff *= 2
+			if *backoff > reconnectMax {
+				*backoff = reconnectMax
+			}
+		}
+		return true
+	}
+}
+
+func bumpBackoff(backoff *time.Duration) {
+	if *backoff < reconnectMax {
+		*backoff *= 2
+		if *backoff > reconnectMax {
+			*backoff = reconnectMax
+		}
+	}
+}