[PATCH net-next v3 1/6] Revert "tools/net/ynl: improve async notification handling"

[Xiao Liang <shaw.leon@xxxxxxxxx>]

From: Donald Hunter <donald.hunter@xxxxxxxxx>

This reverts commit 1bf70e6c3a5346966c25e0a1ff492945b25d3f80.

This modification to check_ntf() is being reverted so that its behaviour
remains equivalent to ynl_ntf_check() in the C YNL. Instead a new
poll_ntf() will be added in a separate patch.

Signed-off-by: Donald Hunter <donald.hunter@xxxxxxxxx>
---
 tools/net/ynl/cli.py     | 10 +++-----
 tools/net/ynl/lib/ynl.py | 49 ++++++++++++++++------------------------
 2 files changed, 23 insertions(+), 36 deletions(-)

diff --git a/tools/net/ynl/cli.py b/tools/net/ynl/cli.py
index 9e95016b85b3..b8481f401376 100755
--- a/tools/net/ynl/cli.py
+++ b/tools/net/ynl/cli.py
@@ -5,7 +5,6 @@ import argparse
 import json
 import pprint
 import time
-import signal
 
 from lib import YnlFamily, Netlink, NlError
 
@@ -18,8 +17,6 @@ class YnlEncoder(json.JSONEncoder):
             return list(obj)
         return json.JSONEncoder.default(self, obj)
 
-def handle_timeout(sig, frame):
-    exit(0)
 
 def main():
     description = """
@@ -84,8 +81,7 @@ def main():
         ynl.ntf_subscribe(args.ntf)
 
     if args.sleep:
-        signal.signal(signal.SIGALRM, handle_timeout)
-        signal.alarm(args.sleep)
+        time.sleep(args.sleep)
 
     if args.list_ops:
         for op_name, op in ynl.ops.items():
@@ -110,8 +106,8 @@ def main():
         exit(1)
 
     if args.ntf:
-        for msg in ynl.check_ntf():
-            output(msg)
+        ynl.check_ntf()
+        output(ynl.async_msg_queue)
 
 
 if __name__ == "__main__":
diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index 92f85698c50e..c22c22bf2cb7 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -12,8 +12,6 @@ import sys
 import yaml
 import ipaddress
 import uuid
-import queue
-import time
 
 from .nlspec import SpecFamily
 
@@ -491,7 +489,7 @@ class YnlFamily(SpecFamily):
         self.sock.setsockopt(Netlink.SOL_NETLINK, Netlink.NETLINK_GET_STRICT_CHK, 1)
 
         self.async_msg_ids = set()
-        self.async_msg_queue = queue.Queue()
+        self.async_msg_queue = []
 
         for msg in self.msgs.values():
             if msg.is_async:
@@ -905,39 +903,32 @@ class YnlFamily(SpecFamily):
 
         msg['name'] = op['name']
         msg['msg'] = attrs
-        self.async_msg_queue.put(msg)
+        self.async_msg_queue.append(msg)
 
-    def check_ntf(self, interval=0.1):
+    def check_ntf(self):
         while True:
             try:
                 reply = self.sock.recv(self._recv_size, socket.MSG_DONTWAIT)
-                nms = NlMsgs(reply)
-                self._recv_dbg_print(reply, nms)
-                for nl_msg in nms:
-                    if nl_msg.error:
-                        print("Netlink error in ntf!?", os.strerror(-nl_msg.error))
-                        print(nl_msg)
-                        continue
-                    if nl_msg.done:
-                        print("Netlink done while checking for ntf!?")
-                        continue
+            except BlockingIOError:
+                return
 
-                    decoded = self.nlproto.decode(self, nl_msg, None)
-                    if decoded.cmd() not in self.async_msg_ids:
-                        print("Unexpected msg id while checking for ntf", decoded)
-                        continue
+            nms = NlMsgs(reply)
+            self._recv_dbg_print(reply, nms)
+            for nl_msg in nms:
+                if nl_msg.error:
+                    print("Netlink error in ntf!?", os.strerror(-nl_msg.error))
+                    print(nl_msg)
+                    continue
+                if nl_msg.done:
+                    print("Netlink done while checking for ntf!?")
+                    continue
 
-                    self.handle_ntf(decoded)
-            except BlockingIOError:
-                pass
+                decoded = self.nlproto.decode(self, nl_msg, None)
+                if decoded.cmd() not in self.async_msg_ids:
+                    print("Unexpected msg id done while checking for ntf", decoded)
+                    continue
 
-            try:
-                yield self.async_msg_queue.get_nowait()
-            except queue.Empty:
-                try:
-                    time.sleep(interval)
-                except KeyboardInterrupt:
-                    return
+                self.handle_ntf(decoded)
 
     def operation_do_attributes(self, name):
       """
-- 
2.47.0