Add RelayMessage event log in bmc

bmc/src/main/java/foundation/icon/btp/bmc/BTPMessageCenter.java

@@ -540,6 +540,7 @@ private void handleRelayMessage(String _prev, byte[] msgBytes) {
             link.setRxSeq(rxSeq.add(BigInteger.valueOf(msgCount)));
         }
         putLink(link);
+        RelayMessage(_prev, BigInteger.valueOf(msgCount));
 
         // dispatch BTPMessages
         for (byte[] serializedMsg : serializedMsgs) {
@@ -1184,4 +1185,8 @@ private void requireNormalMode() {
             throw BMCException.unknown("not normal mode");
         }
     }
+
+    @EventLog
+    public void RelayMessage(String _prev, BigInteger _count) {
+    }
 }

bmc/src/main/java/foundation/icon/btp/bmc/ICONSpecific.java

@@ -148,4 +148,16 @@ public interface ICONSpecific {
      */
     @External(readonly = true)
     BigInteger getMode();
+
+    /**
+     * (EventLog) Logs the event that handle the relay message
+     * The tracker monitors this event.
+     * <p>
+     * indexed: 0
+     *
+     * @param _prev  String ( BTP Address of the previous BMC )
+     * @param _count Integer ( number of the processed BTP message )
+     */
+    @EventLog
+    void RelayMessage(String _prev, BigInteger _count);
 }

bmc/src/test/java/foundation/icon/btp/bmc/BMCIntegrationTest.java

@@ -139,4 +139,10 @@ static Consumer<TransactionResult> btpEvent(
                 consumer, null);
     }
 
+    static Consumer<TransactionResult> relayMessageEvent(
+            Consumer<ICONSpecificScoreClient.RelayMessage> consumer) {
+        return eventLogChecker(
+                ICONSpecificScoreClient.RelayMessage::eventLogs,
+                consumer, null);
+    }
 }

bmc/src/test/java/foundation/icon/btp/bmc/MessageTest.java

@@ -158,6 +158,15 @@ static Consumer<TransactionResult> btpEventChecker(
                 )));
     }
 
+    static Consumer<TransactionResult> relayMessageEventChecker(
+            final BTPAddress prev, final int count) {
+        return BMCIntegrationTest.relayMessageEvent(
+                (el) -> {
+                    assertEquals(prev.toString(), el.get_prev());
+                    assertEquals(BigInteger.valueOf(count), el.get_count());
+                });
+    }
+
     @ParameterizedTest
     @MethodSource("sendMessageShouldSuccessArguments")
     void sendMessageShouldSuccess(
@@ -282,6 +291,8 @@ void handleRelayMessageShouldSuccess(
 
         System.out.println("handleRelayMessageShouldIncreaseRxSeq");
         Consumer<TransactionResult> checker = rxSeqChecker(prev);
+        System.out.println("handleRelayMessageShouldEmitRelayMessage");
+        checker = checker.andThen(relayMessageEventChecker(prev, 1));
         if (expectBTPError != null) {
             if (snCompare > 0) {
                 System.out.println("handleRelayMessageShouldReplyBTPError");

bmc/src/test/java/foundation/icon/btp/bmc/MessageWithFeeTest.java

@@ -277,6 +277,8 @@ void handleRelayMessageShouldSuccess(
         System.out.println("handleRelayMessageShouldIncreaseRxSeqAndAccumulateReward");
         Consumer<TransactionResult> checker = MessageTest.rxSeqChecker(prev)
                 .andThen(rewardChecker(msg));
+        System.out.println("handleRelayMessageShouldEmitRelayMessage");
+        checker = checker.andThen(MessageTest.relayMessageEventChecker(prev, 1));
         if (expectBTPError != null) {
             System.out.println("handleRelayMessageShouldReplyBTPError");
             checker = checker.andThen(responseMessageChecker(prev, msg, expectBTPError));