feat(schema/appdata)!: packet support and small refactorings (#20860)

schema/appdata/packet.go

@@ -0,0 +1,61 @@
+package appdata
+
+// Packet is the interface that all listener data structures implement so that this data can be "packetized"
+// and processed in a stream, possibly asynchronously.
+type Packet interface {
+	apply(*Listener) error
+}
+
+// SendPacket sends a packet to a listener invoking the appropriate callback for this packet if one is registered.
+func (l Listener) SendPacket(p Packet) error {
+	return p.apply(&l)
+}
+
+func (m ModuleInitializationData) apply(l *Listener) error {
+	if l.InitializeModuleData == nil {
+		return nil
+	}
+	return l.InitializeModuleData(m)
+}
+
+func (b StartBlockData) apply(l *Listener) error {
+	if l.StartBlock == nil {
+		return nil
+	}
+	return l.StartBlock(b)
+}
+
+func (t TxData) apply(l *Listener) error {
+	if l.OnTx == nil {
+		return nil
+	}
+	return l.OnTx(t)
+}
+
+func (e EventData) apply(l *Listener) error {
+	if l.OnEvent == nil {
+		return nil
+	}
+	return l.OnEvent(e)
+}
+
+func (k KVPairData) apply(l *Listener) error {
+	if l.OnKVPair == nil {
+		return nil
+	}
+	return l.OnKVPair(k)
+}
+
+func (o ObjectUpdateData) apply(l *Listener) error {
+	if l.OnObjectUpdate == nil {
+		return nil
+	}
+	return l.OnObjectUpdate(o)
+}
+
+func (c CommitData) apply(l *Listener) error {
+	if l.Commit == nil {
+		return nil
+	}
+	return l.Commit(c)
+}