feat(zeromq): add block info publisher

node/node.go

@@ -167,7 +167,6 @@ func (n *Node) Stop() {
 	// Wait for network to stop
 	time.Sleep(1 * time.Second)
 
-	close(n.eventCh)
 	n.consMgr.Stop()
 	n.sync.Stop()
 	n.state.Close()
@@ -176,6 +175,8 @@ func (n *Node) Stop() {
 	n.http.StopServer()
 	n.jsonrpc.StopServer()
 	n.zeromq.Close()
+
+	close(n.eventCh)
 }
 
 // these methods are using by GUI.

state/state.go

@@ -752,5 +752,8 @@
 		return
 	}
 
-	st.eventCh <- msg
+	select {
+	case st.eventCh <- msg:
+	default:
+	}
 }

www/zmq/block_info_publisher.go

@@ -14,13 +14,30 @@
 	return &blockInfoPub{
 		basePub: basePub{
 			topic:     BlockInfo,
+			seqNo:     0,
 			zmqSocket: socket,
 			logger:    logger,
 		},
 	}
 }
 
-func (*blockInfoPub) onNewBlock(_ *block.Block) {
-	// TODO implement me
-	panic("implement me")
+func (b *blockInfoPub) onNewBlock(blk *block.Block) {
+	rawMsg := b.makeTopicMsg(
+		blk.Header().ProposerAddress(),
+		blk.Header().UnixTime(),
+		uint16(len(blk.Transactions())),
+		blk.Height(),
+	)
+
+	message := zmq4.NewMsg(rawMsg)
+
+	if err := b.zmqSocket.Send(message); err != nil {
+		b.logger.Error("zmq publish message error", "err", err, "publisher", b.TopicName())
+	}
+
+	b.logger.Debug("zmq published message success",
+		"publisher", b.TopicName(),
+		"block_height", blk.Height())
+
+	b.seqNo++
 }

www/zmq/block_info_publisher_test.go

@@ -0,0 +1,67 @@
+package zmq
+
+import (
+	"context"
+	"encoding/binary"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/go-zeromq/zmq4"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBlockInfoPublisher(t *testing.T) {
+	td := setup(t)
+	defer td.cleanup()
+
+	port := td.FindFreePort()
+	addr := fmt.Sprintf("tcp://localhost:%d", port)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	conf := DefaultConfig()
+	conf.ZmqPubBlockInfo = addr
+
+	err := td.initServer(ctx, conf)
+	require.NoError(t, err)
+
+	sub := zmq4.NewSub(ctx)
+	defer func() {
+		_ = sub.Close()
+	}()
+
+	err = sub.Dial(addr)
+	require.NoError(t, err)
+
+	err = sub.SetOption(zmq4.OptionSubscribe, string(BlockInfo.Bytes()))
+	require.NoError(t, err)
+
+	blk, _ := td.TestSuite.GenerateTestBlock(td.RandHeight())
+
+	td.eventCh <- blk
+
+	received, err := sub.Recv()
+	require.NoError(t, err)
+
+	require.NotNil(t, received.Frames)
+	require.GreaterOrEqual(t, len(received.Frames), 1)
+
+	msg := received.Frames[0]
+	require.Len(t, msg, 37)
+
+	topic := msg[:2]
+	proposerBytes := msg[2:23]
+	timestamp := binary.BigEndian.Uint32(msg[23:27])
+	txCount := binary.BigEndian.Uint16(msg[27:29])
+	height := binary.BigEndian.Uint32(msg[29:33])
+	seqNo := binary.BigEndian.Uint32(msg[33:])
+
+	require.Equal(t, BlockInfo.Bytes(), topic)
+	require.Equal(t, blk.Header().ProposerAddress().Bytes(), proposerBytes)
+	require.Equal(t, blk.Header().UnixTime(), timestamp)
+	require.Equal(t, uint16(len(blk.Transactions())), txCount)
+	require.Equal(t, blk.Height(), height)
+	require.Equal(t, uint32(0), seqNo)
+}

www/zmq/config.go

@@ -65,7 +65,7 @@
 func validateTopicSocket(socket string) error {
 	addr, err := url.Parse(socket)
 	if err != nil {
-		return errors.New("failed to parse ZmqPub value: " + err.Error())
+		return errors.New("failed to parse URL: " + err.Error())
 	}
 
 	if addr.Scheme != "tcp" {

www/zmq/config_test.go

@@ -51,7 +51,7 @@ func TestBasicCheck(t *testing.T) {
 		{
 			name: "Empty host",
 			config: &Config{
-				ZmqPubBlockInfo: "tcp://:28332",
+				ZmqPubTxInfo: "tcp://:28332",
 			},
 			expectErr: true,
 		},

www/zmq/publisher.go

@@ -1,7 +1,10 @@
 package zmq
 
 import (
+	"encoding/binary"
+
 	"github.com/go-zeromq/zmq4"
+	"github.com/pactus-project/pactus/crypto"
 	"github.com/pactus-project/pactus/types/block"
 	"github.com/pactus-project/pactus/util/logger"
 )
@@ -15,6 +18,7 @@
 
 type basePub struct {
 	topic     Topic
+	seqNo     uint32
 	zmqSocket zmq4.Socket
 	logger    *logger.SubLogger
 }
@@ -26,3 +30,36 @@
 func (b *basePub) TopicName() string {
 	return b.topic.String()
 }
+
+// makeTopicMsg constructs a ZMQ message with a topic ID, message body, and sequence number.
+// The message is constructed as a byte slice with the following structure:
+// - Topic ID (2 Bytes)
+// - Message body (varies based on provided parts)
+// - Sequence number (4 Bytes).
+func (b *basePub) makeTopicMsg(parts ...any) []byte {
+	result := make([]byte, 0, 64)
+
+	// Append Topic ID to the message (2 Bytes)
+	result = append(result, b.topic.Bytes()...)
+
+	// Append message body based on the provided parts
+	for _, part := range parts {
+		switch castedVal := part.(type) {
+		case crypto.Address:
+			result = append(result, castedVal.Bytes()...)
+		case []byte:
+			result = append(result, castedVal...)
+		case uint32:
+			result = binary.BigEndian.AppendUint32(result, castedVal)
+		case uint16:
+			result = binary.BigEndian.AppendUint16(result, castedVal)
+		default:
+			panic("implement me!!")
+		}
+	}
+
+	// Append sequence number to the message (4 Bytes, Big Endian encoding)
+	result = binary.BigEndian.AppendUint32(result, b.seqNo)
+
+	return result
+}

www/zmq/server_test.go

@@ -49,30 +49,28 @@ func (ts *testData) resetServer() {
 	ts.eventCh = nil
 }
 
-func (ts *testData) cleanup() func() {
-	return func() {
-		ts.server.Close()
-		ts.resetServer()
-	}
+func (ts *testData) cleanup() {
+	ts.server.Close()
+	ts.resetServer()
 }
 
 func TestServerWithDefaultConfig(t *testing.T) {
-	suite := setup(t)
+	td := setup(t)
 
 	conf := DefaultConfig()
 
-	err := suite.initServer(context.TODO(), conf)
-	t.Cleanup(suite.cleanup())
+	err := td.initServer(context.TODO(), conf)
+	defer td.cleanup()
 
 	assert.NoError(t, err)
-	require.NotNil(t, suite.server)
+	require.NotNil(t, td.server)
 }
 
 func TestTopicsWithSameSocket(t *testing.T) {
-	suite := setup(t)
-	t.Cleanup(suite.cleanup())
+	td := setup(t)
+	defer td.cleanup()
 
-	port := suite.FindFreePort()
+	port := td.FindFreePort()
 	addr := fmt.Sprintf("tcp://127.0.0.1:%d", port)
 
 	conf := DefaultConfig()
@@ -81,30 +79,30 @@ func TestTopicsWithSameSocket(t *testing.T) {
 	conf.ZmqPubRawBlock = addr
 	conf.ZmqPubRawTx = addr
 
-	err := suite.initServer(context.TODO(), conf)
+	err := td.initServer(context.TODO(), conf)
 	require.NoError(t, err)
 
-	require.Len(t, suite.server.publishers, 4)
+	require.Len(t, td.server.publishers, 4)
 
-	expectedAddr := suite.server.publishers[0].Address()
+	expectedAddr := td.server.publishers[0].Address()
 
-	for _, pub := range suite.server.publishers {
+	for _, pub := range td.server.publishers {
 		require.Equal(t, expectedAddr, pub.Address(), "All publishers must have the same address")
 	}
 }
 
 func TestTopicsWithDifferentSockets(t *testing.T) {
-	suite := setup(t)
-	t.Cleanup(suite.cleanup())
+	td := setup(t)
+	defer td.cleanup()
 
 	conf := DefaultConfig()
-	conf.ZmqPubBlockInfo = fmt.Sprintf("tcp://127.0.0.1:%d", suite.FindFreePort())
-	conf.ZmqPubTxInfo = fmt.Sprintf("tcp://127.0.0.1:%d", suite.FindFreePort())
-	conf.ZmqPubRawBlock = fmt.Sprintf("tcp://127.0.0.1:%d", suite.FindFreePort())
-	conf.ZmqPubRawTx = fmt.Sprintf("tcp://127.0.0.1:%d", suite.FindFreePort())
+	conf.ZmqPubBlockInfo = fmt.Sprintf("tcp://127.0.0.1:%d", td.FindFreePort())
+	conf.ZmqPubTxInfo = fmt.Sprintf("tcp://127.0.0.1:%d", td.FindFreePort())
+	conf.ZmqPubRawBlock = fmt.Sprintf("tcp://127.0.0.1:%d", td.FindFreePort())
+	conf.ZmqPubRawTx = fmt.Sprintf("tcp://127.0.0.1:%d", td.FindFreePort())
 
-	err := suite.initServer(context.TODO(), conf)
+	err := td.initServer(context.TODO(), conf)
 	require.NoError(t, err)
 
-	require.Len(t, suite.server.publishers, 4)
+	require.Len(t, td.server.publishers, 4)
 }

www/zmq/topic.go

@@ -1,5 +1,7 @@
 package zmq
 
+import "encoding/binary"
+
 type Topic int16
 
 const (
@@ -27,3 +29,10 @@ func (t Topic) String() string {
 		return ""
 	}
 }
+
+func (t Topic) Bytes() []byte {
+	b := make([]byte, 2)
+	binary.BigEndian.PutUint16(b, uint16(t))
+
+	return b
+}