feat: set max_iteration only query trace_id data when is 0

Author: taloric

app/app/application/l7_flow_tracing.py

@@ -282,6 +282,12 @@ async def query_and_trace_flowmetas(
                 if trace_id:
                     allowed_trace_ids.add(trace_id)
                     new_trace_ids_in_prev_iteration.add(trace_id)
+                
+        # max_iterations set to 0 means only query data with trace_id
+        only_query_trace_id = False
+        if max_iteration == 0:
+            max_iteration = 1
+            only_query_trace_id = True
 
         # 进行迭代查询，上限为 config.spec.max_iteration
         for i in range(max_iteration):
@@ -358,6 +364,8 @@ async def query_and_trace_flowmetas(
 
             if only_query_app_spans:  # no more iterations needed
                 break
+            if only_query_trace_id:  # no more iterations needed
+                break
 
             # 2. Query by tcp_seq / syscall_trace_id / x_request_id
             new_filters = []

app/app/models/models.py

@@ -21,7 +21,7 @@ class FlowLogL7Tracing(Model):
     debug = BooleanType(serialized_name="DEBUG", required=False)
     max_iteration = IntType(serialized_name="MAX_ITERATION",
                             required=False,
-                            min_value=1,
+                            min_value=0,
                             default=config.max_iteration)
     network_delay_us = IntType(serialized_name="NETWORK_DELAY_US",
                                required=False,