feat(net):improve chain inventory generating logic (#5393)

Author: jwrct

framework/src/main/java/org/tron/core/net/messagehandler/SyncBlockChainMsgHandler.java

@@ -87,6 +87,18 @@ private boolean check(PeerConnection peer, SyncBlockChainMessage msg) throws P2p
 
   private LinkedList<BlockId> getLostBlockIds(List<BlockId> blockIds) throws P2pException {
 
+    BlockId unForkId = getUnForkId(blockIds);
+    LinkedList<BlockId> ids = getBlockIds(unForkId.getNum());
+
+    if (ids.isEmpty() || !unForkId.equals(ids.peekFirst())) {
+      unForkId = getUnForkId(blockIds);
+      ids = getBlockIds(unForkId.getNum());
+    }
+
+    return ids;
+  }
+
+  private BlockId getUnForkId(List<BlockId> blockIds) throws P2pException {
     BlockId unForkId = null;
     for (int i = blockIds.size() - 1; i >= 0; i--) {
       if (tronNetDelegate.containBlockInMainChain(blockIds.get(i))) {
@@ -99,13 +111,17 @@ private LinkedList<BlockId> getLostBlockIds(List<BlockId> blockIds) throws P2pEx
       throw new P2pException(TypeEnum.SYNC_FAILED, "unForkId is null");
     }
 
+    return unForkId;
+  }
+
+  private LinkedList<BlockId> getBlockIds(Long unForkNum) throws P2pException {
     BlockId headID = tronNetDelegate.getHeadBlockId();
     long headNum = headID.getNum();
 
-    long len = Math.min(headNum, unForkId.getNum() + NetConstants.SYNC_FETCH_BATCH_NUM);
+    long len = Math.min(headNum, unForkNum + NetConstants.SYNC_FETCH_BATCH_NUM);
 
     LinkedList<BlockId> ids = new LinkedList<>();
-    for (long i = unForkId.getNum(); i <= len; i++) {
+    for (long i = unForkNum; i <= len; i++) {
       if (i == headNum) {
         ids.add(headID);
       } else {

framework/src/test/java/org/tron/core/net/messagehandler/SyncBlockChainMsgHandlerTest.java

@@ -2,6 +2,7 @@
 
 import java.io.File;
 import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.net.InetSocketAddress;
 import java.util.ArrayList;
@@ -64,6 +65,21 @@ public void testProcessMessage() throws Exception {
     method.setAccessible(true);
     boolean f = (boolean)method.invoke(handler, peer, message);
     Assert.assertTrue(!f);
+
+    Method method1 = handler.getClass().getDeclaredMethod(
+        "getLostBlockIds", List.class);
+    method1.setAccessible(true);
+    try {
+      method1.invoke(handler, blockIds);
+    } catch (InvocationTargetException e) {
+      Assert.assertEquals("unForkId is null", e.getTargetException().getMessage());
+    }
+
+    Method method2 = handler.getClass().getDeclaredMethod(
+        "getBlockIds", Long.class);
+    method2.setAccessible(true);
+    List list = (List) method2.invoke(handler, 0L);
+    Assert.assertEquals(1, list.size());
   }
 
   @After