Revert "Speed up route_check script" (sonic-net#3653)

* Revert "Speed up route_check script (sonic-net#3544)"

This reverts commit 7cbcfda.

* Revert Speed up route_check script

Author: xwjiang-ms

scripts/route_check.py

@@ -46,7 +46,6 @@
 import signal
 import traceback
 import subprocess
-import concurrent.futures
 
 from ipaddress import ip_network
 from swsscommon import swsscommon
@@ -339,18 +338,10 @@ def is_suppress_fib_pending_enabled(namespace):
     return state == 'enabled'
 
 
-def fetch_routes(cmd):
+def get_frr_routes(namespace):
     """
-    Fetch routes using the given command.
-    """
-    output = subprocess.check_output(cmd, text=True)
-    return json.loads(output)
-
-
-def get_frr_routes_parallel(namespace):
-    """
-    Read routes from zebra through CLI command for IPv4 and IPv6 in parallel
-    :return combined IPv4 and IPv6 routes dictionary.
+    Read routes from zebra through CLI command
+    :return frr routes dictionary
     """
     if namespace == multi_asic.DEFAULT_NAMESPACE:
         v4_route_cmd = ['show', 'ip', 'route', 'json']
@@ -359,18 +350,12 @@ def get_frr_routes_parallel(namespace):
         v4_route_cmd = ['show', 'ip', 'route', '-n', namespace, 'json']
         v6_route_cmd = ['show', 'ipv6', 'route', '-n', namespace, 'json']
 
-    with concurrent.futures.ThreadPoolExecutor() as executor:
-        future_v4 = executor.submit(fetch_routes, v4_route_cmd)
-        future_v6 = executor.submit(fetch_routes, v6_route_cmd)
-
-        # Wait for both results to complete
-        v4_routes = future_v4.result()
-        v6_routes = future_v6.result()
-
-    # Combine both IPv4 and IPv6 routes
-    v4_routes.update(v6_routes)
-    print_message(syslog.LOG_DEBUG, "FRR Routes: namespace={}, routes={}".format(namespace, v4_routes))
-    return v4_routes
+    output = subprocess.check_output(v4_route_cmd, text=True)
+    routes = json.loads(output)
+    output = subprocess.check_output(v6_route_cmd, text=True)
+    routes.update(json.loads(output))
+    print_message(syslog.LOG_DEBUG, "FRR Routes: namespace={}, routes={}".format(namespace, routes))
+    return routes
 
 
 def get_interfaces(namespace):
@@ -571,7 +556,7 @@ def check_frr_pending_routes(namespace):
     retries = FRR_CHECK_RETRIES
     for i in range(retries):
         missed_rt = []
-        frr_routes = get_frr_routes_parallel(namespace)
+        frr_routes = get_frr_routes(namespace)
 
         for _, entries in frr_routes.items():
             for entry in entries:
@@ -704,9 +689,8 @@ def _filter_out_neigh_route(routes, neighs):
     return rt_appl_miss, rt_asic_miss
 
 
-def check_routes_for_namespace(namespace):
+def check_routes(namespace):
     """
-    Process a Single Namespace:
     The heart of this script which runs the checks.
     Read APPL-DB & ASIC-DB, the relevant tables for route checking.
     Checkout routes in ASIC-DB to match APPL-DB, discounting local &
@@ -724,82 +708,6 @@ def check_routes_for_namespace(namespace):
     :return (0, None) on sucess, else (-1, results) where results holds
     the unjustifiable entries.
     """
-
-    results = {}
-    adds = []
-    deletes = []
-    intf_appl_miss = []
-    rt_appl_miss = []
-    rt_asic_miss = []
-    rt_frr_miss = []
-
-    selector, subs, rt_asic = get_asicdb_routes(namespace)
-
-    rt_appl = get_appdb_routes(namespace)
-    intf_appl = get_interfaces(namespace)
-
-    # Diff APPL-DB routes & ASIC-DB routes
-    rt_appl_miss, rt_asic_miss = diff_sorted_lists(rt_appl, rt_asic)
-
-    # Check missed ASIC routes against APPL-DB INTF_TABLE
-    _, rt_asic_miss = diff_sorted_lists(intf_appl, rt_asic_miss)
-    rt_asic_miss = filter_out_default_routes(rt_asic_miss)
-    rt_asic_miss = filter_out_vnet_routes(namespace, rt_asic_miss)
-    rt_asic_miss = filter_out_standalone_tunnel_routes(namespace, rt_asic_miss)
-    rt_asic_miss = filter_out_soc_ip_routes(namespace, rt_asic_miss)
-
-    # Check APPL-DB INTF_TABLE with ASIC table route entries
-    intf_appl_miss, _ = diff_sorted_lists(intf_appl, rt_asic)
-
-    if rt_appl_miss:
-        rt_appl_miss = filter_out_local_interfaces(namespace, rt_appl_miss)
-
-    if rt_appl_miss:
-        rt_appl_miss = filter_out_voq_neigh_routes(namespace, rt_appl_miss)
-
-    # NOTE: On dualtor environment, ignore any route miss for the
-    # neighbors learned from the vlan subnet.
-    if rt_appl_miss or rt_asic_miss:
-        rt_appl_miss, rt_asic_miss = filter_out_vlan_neigh_route_miss(namespace, rt_appl_miss, rt_asic_miss)
-
-    if rt_appl_miss or rt_asic_miss:
-        # Look for subscribe updates for a second
-        adds, deletes = get_subscribe_updates(selector, subs)
-
-    # Drop all those for which SET received
-    rt_appl_miss, _ = diff_sorted_lists(rt_appl_miss, adds)
-
-    # Drop all those for which DEL received
-    rt_asic_miss, _ = diff_sorted_lists(rt_asic_miss, deletes)
-
-    if rt_appl_miss:
-        results["missed_ROUTE_TABLE_routes"] = rt_appl_miss
-
-    if intf_appl_miss:
-        results["missed_INTF_TABLE_entries"] = intf_appl_miss
-
-    if rt_asic_miss:
-        results["Unaccounted_ROUTE_ENTRY_TABLE_entries"] = rt_asic_miss
-
-    rt_frr_miss = check_frr_pending_routes(namespace)
-
-    if rt_frr_miss:
-        results["missed_FRR_routes"] = rt_frr_miss
-
-    if results:
-        if rt_frr_miss and not rt_appl_miss and not rt_asic_miss:
-            print_message(syslog.LOG_ERR, "Some routes are not set offloaded in FRR{} \
-                          but all routes in APPL_DB and ASIC_DB are in sync".format(namespace))
-            if is_suppress_fib_pending_enabled(namespace):
-                mitigate_installed_not_offloaded_frr_routes(namespace, rt_frr_miss, rt_appl)
-
-    return results, adds, deletes
-
-
-def check_routes(namespace):
-    """
-    Main function to parallelize route checks across all namespaces.
-    """
     namespace_list = []
     if namespace is not multi_asic.DEFAULT_NAMESPACE and namespace in multi_asic.get_namespace_list():
         namespace_list.append(namespace)
@@ -808,29 +716,89 @@ def check_routes(namespace):
         print_message(syslog.LOG_INFO, "Checking routes for namespaces: ", namespace_list)
 
     results = {}
-    all_adds = {}
-    all_deletes = {}
-
-    # Use ThreadPoolExecutor to parallelize the check for each namespace
-    with concurrent.futures.ThreadPoolExecutor() as executor:
-        futures = {executor.submit(check_routes_for_namespace, ns): ns for ns in namespace_list}
-
-        for future in concurrent.futures.as_completed(futures):
-            ns = futures[future]
-            try:
-                result, adds, deletes = future.result()
-                if result:
-                    results[ns] = result
-                all_adds[ns] = adds
-                all_deletes[ns] = deletes
-            except Exception as e:
-                print_message(syslog.LOG_ERR, "Error processing namespace {}: {}".format(ns, e))
+    adds = {}
+    deletes = {}
+    for namespace in namespace_list:
+        intf_appl_miss = []
+        rt_appl_miss = []
+        rt_asic_miss = []
+        rt_frr_miss = []
+        adds[namespace] = []
+        deletes[namespace] = []
+
+        selector, subs, rt_asic = get_asicdb_routes(namespace)
+
+        rt_appl = get_appdb_routes(namespace)
+        intf_appl = get_interfaces(namespace)
+
+        # Diff APPL-DB routes & ASIC-DB routes
+        rt_appl_miss, rt_asic_miss = diff_sorted_lists(rt_appl, rt_asic)
+
+        # Check missed ASIC routes against APPL-DB INTF_TABLE
+        _, rt_asic_miss = diff_sorted_lists(intf_appl, rt_asic_miss)
+        rt_asic_miss = filter_out_default_routes(rt_asic_miss)
+        rt_asic_miss = filter_out_vnet_routes(namespace, rt_asic_miss)
+        rt_asic_miss = filter_out_standalone_tunnel_routes(namespace, rt_asic_miss)
+        rt_asic_miss = filter_out_soc_ip_routes(namespace, rt_asic_miss)
+
+        # Check APPL-DB INTF_TABLE with ASIC table route entries
+        intf_appl_miss, _ = diff_sorted_lists(intf_appl, rt_asic)
+
+        if rt_appl_miss:
+            rt_appl_miss = filter_out_local_interfaces(namespace, rt_appl_miss)
+
+        if rt_appl_miss:
+            rt_appl_miss = filter_out_voq_neigh_routes(namespace, rt_appl_miss)
+
+        # NOTE: On dualtor environment, ignore any route miss for the
+        # neighbors learned from the vlan subnet.
+        if rt_appl_miss or rt_asic_miss:
+            rt_appl_miss, rt_asic_miss = filter_out_vlan_neigh_route_miss(namespace, rt_appl_miss, rt_asic_miss)
+
+        if rt_appl_miss or rt_asic_miss:
+            # Look for subscribe updates for a second
+            adds[namespace], deletes[namespace] = get_subscribe_updates(selector, subs)
+
+        # Drop all those for which SET received
+        rt_appl_miss, _ = diff_sorted_lists(rt_appl_miss, adds[namespace])
+
+        # Drop all those for which DEL received
+        rt_asic_miss, _ = diff_sorted_lists(rt_asic_miss, deletes[namespace])
+
+        if rt_appl_miss:
+            if namespace not in results:
+                results[namespace] = {}
+            results[namespace]["missed_ROUTE_TABLE_routes"] = rt_appl_miss
+
+        if intf_appl_miss:
+            if namespace not in results:
+                results[namespace] = {}
+            results[namespace]["missed_INTF_TABLE_entries"] = intf_appl_miss
+
+        if rt_asic_miss:
+            if namespace not in results:
+                results[namespace] = {}
+            results[namespace]["Unaccounted_ROUTE_ENTRY_TABLE_entries"] = rt_asic_miss
+
+        rt_frr_miss = check_frr_pending_routes(namespace)
+
+        if rt_frr_miss:
+            if namespace not in results:
+                results[namespace] = {}
+            results[namespace]["missed_FRR_routes"] = rt_frr_miss
+
+        if results:
+            if rt_frr_miss and not rt_appl_miss and not rt_asic_miss:
+                print_message(syslog.LOG_ERR, "Some routes are not set offloaded in FRR{} \
+                              but all routes in APPL_DB and ASIC_DB are in sync".format(namespace))
+                if is_suppress_fib_pending_enabled(namespace):
+                    mitigate_installed_not_offloaded_frr_routes(namespace, rt_frr_miss, rt_appl)
 
     if results:
         print_message(syslog.LOG_WARNING, "Failure results: {",  json.dumps(results, indent=4), "}")
         print_message(syslog.LOG_WARNING, "Failed. Look at reported mismatches above")
-        print_message(syslog.LOG_WARNING, "add: ", json.dumps(all_adds, indent=4))
-        print_message(syslog.LOG_WARNING, "del: ", json.dumps(all_deletes, indent=4))
+        print_message(syslog.LOG_WARNING, "add: ", json.dumps(adds, indent=4))
+        print_message(syslog.LOG_WARNING, "del: ", json.dumps(deletes, indent=4))
         return -1, results
     else:
         print_message(syslog.LOG_INFO, "All good!")