internal/server/message_queue.go: adding MessageQueue struct

This struct will handle the routing to channels aswell as encoding of
the messages.

internal/server/message_queue.go

@@ -0,0 +1,74 @@
+package server
+
+import (
+	"errors"
+
+	"github.com/eosswedenorg/thalos/api"
+	"github.com/eosswedenorg/thalos/api/message"
+	"github.com/eosswedenorg/thalos/internal/driver"
+)
+
+// MessageQueue takes care of message routing and encoding
+type MessageQueue struct {
+	// Writer to write messages to
+	writer driver.Writer
+
+	// encoder to encode messages with
+	encode message.Encoder
+}
+
+func NewMessageQueue(writer driver.Writer, encoder message.Encoder) MessageQueue {
+	return MessageQueue{
+		writer: writer,
+		encode: encoder,
+	}
+}
+
+func (mq MessageQueue) PostHeartbeat(hb message.HeartBeat) error {
+	return mq.post(hb, api.HeartbeatChannel)
+}
+
+func (mq MessageQueue) PostRollback(rb message.RollbackMessage) error {
+	return mq.post(rb, api.RollbackChannel)
+}
+
+func (mq MessageQueue) PostTransactionTrace(trace message.TransactionTrace) error {
+	return mq.post(trace, api.TransactionChannel)
+}
+
+// Post a ActionTrace message to the queue
+func (mq MessageQueue) PostAction(act message.ActionTrace) error {
+	return mq.post(act,
+		api.ActionChannel{}.Channel(),
+		api.ActionChannel{Name: act.Name}.Channel(),
+		api.ActionChannel{Contract: act.Contract}.Channel(),
+		api.ActionChannel{Name: act.Name, Contract: act.Contract}.Channel(),
+	)
+}
+
+func (mq MessageQueue) PostTableDelta(delta message.TableDelta) error {
+	return mq.post(delta,
+		api.TableDeltaChannel{}.Channel(),
+		api.TableDeltaChannel{Name: delta.Name}.Channel(),
+	)
+}
+
+func (mq MessageQueue) Flush() error {
+	return mq.writer.Flush()
+}
+
+func (mq MessageQueue) Close() error {
+	return mq.writer.Close()
+}
+
+func (mq MessageQueue) post(v interface{}, channels ...api.Channel) error {
+	payload, err := mq.encode(v)
+	if err == nil {
+		for _, channel := range channels {
+			if w_err := mq.writer.Write(channel, payload); err != nil {
+				err = errors.Join(w_err)
+			}
+		}
+	}
+	return err
+}