Use diodes instead of channels in SSE broker

server/events/diode.go

@@ -0,0 +1,26 @@
+package events
+
+import (
+	"context"
+
+	"code.cloudfoundry.org/go-diodes"
+)
+
+type diode struct {
+	d *diodes.Poller
+}
+
+func newDiode(ctx context.Context, size int, alerter diodes.Alerter) *diode {
+	return &diode{
+		d: diodes.NewPoller(diodes.NewOneToOne(size, alerter), diodes.WithPollingContext(ctx)),
+	}
+}
+
+func (d *diode) set(data message) {
+	d.d.Set(diodes.GenericDataType(&data))
+}
+
+func (d *diode) next() *message {
+	data := d.d.Next()
+	return (*message)(data)
+}