fix: add more conflict validation for tracing

Author: taloric

app/app/application/l7_flow_tracing.py

@@ -3245,6 +3245,10 @@ def _connect_process_and_networks(
         ps_index = ps_parent.get_flow_index()
         ps_span_id = ps_parent.get_span_id()
         ps_response_duration = ps_parent.get_response_duration()
+        # 特殊场景，如果叶子是一个 c-p，且已经有一个 child 时
+        # 由于这个场景底下接一定是 net_child，而一个 c-p 只可能启动一个网络请求，因此这里规避下矛盾
+        if ps_parent.tap_side.startswith("c") and ps_parent.children_count > 0:
+            continue
         for _index, related_types in related_flow_index_map.get(ps_index,
                                                                 {}).items():
             if related_types & L7_FLOW_RELATIONSHIP_SPAN_ID != L7_FLOW_RELATIONSHIP_SPAN_ID:
@@ -3282,6 +3286,10 @@ def _connect_process_and_networks(
         net_index = net_parent.get_flow_index()
         net_span_id = net_parent.get_span_id()
         net_response_duration = net_parent.get_response_duration()
+        # 对称校验，一个 s 网卡下只能有一个接收侧 s-p
+        if net_parent.tap_side.startswith(
+                "s") and net_parent.children_count > 0:
+            continue
         for _index, related_types in related_flow_index_map.get(net_index,
                                                                 {}).items():
             if related_types & L7_FLOW_RELATIONSHIP_SPAN_ID != L7_FLOW_RELATIONSHIP_SPAN_ID:
@@ -3328,6 +3336,7 @@ def _connect_process_and_networks(
         ps_parent_index = ps_parent.get_flow_index()
         ps_parent_span_id = ps_parent.get_span_id()
         ps_parent_response_duartion = ps_parent.get_response_duration()
+        # 没有校验，因为 c-p 下可能接多个 s-p，s-p 下可能有多个 c-p
         for _index, related_types in related_flow_index_map.get(
                 ps_parent_index, {}).items():
             if related_types & L7_FLOW_RELATIONSHIP_SPAN_ID != L7_FLOW_RELATIONSHIP_SPAN_ID:
@@ -3582,6 +3591,7 @@ def _connect_process_and_networks(
 
     # 7. 通过 trace_id 关联：叶子 span（客户端侧，无子节点）→ 根 span（服务端侧，无父节点）
     # 条件：trace_id 有交集，tcp_seq 不同，叶子时延 >= 根时延
+    # XXX: 此场景仅供临时使用，真正解决方案为使用 span_id 串联二者
     if 'net_span_c_to_s_via_trace_id' in config.span_set_connection_strategies:
         for net_parent in network_leafs:
             if net_parent.children_count > 0: