configd: T6899: use multipart message instead of extra exchange

1 files changed, 9 insertions, 19 deletions

diff --git a/src/services/vyos-configd b/src/services/vyos-configd
index cb23642dc..d977ba2cb 100755
--- a/src/services/vyos-configd
+++ b/src/services/vyos-configd
@@ -56,6 +56,7 @@ else:
 
 SOCKET_PATH = 'ipc:///run/vyos-configd.sock'
 MAX_MSG_SIZE = 65535
+PAD_MSG_SIZE = 6
 
 # Response error codes
 R_SUCCESS = 1
@@ -256,25 +257,14 @@ def process_node_data(config, data, _last: bool = False) -> tuple[int, str]:
 
 
 def send_result(sock, err, msg):
-    msg_size = min(MAX_MSG_SIZE, len(msg)) if msg else 0
-
-    err_rep = err.to_bytes(1, byteorder=sys.byteorder)
-    logger.debug(f'Sending reply: {err}')
-    sock.send(err_rep)
-
-    # size req from vyshim client
-    size_req = sock.recv().decode()
-    logger.debug(f'Received request: {size_req}')
-    msg_size_rep = hex(msg_size).encode()
-    sock.send(msg_size_rep)
-    logger.debug(f'Sending reply: {msg_size}')
-
-    if msg_size > 0:
-        # send req is sent from vyshim client only if msg_size > 0
-        send_req = sock.recv().decode()
-        logger.debug(f'Received request: {send_req}')
-        sock.send(msg.encode())
-        logger.debug('Sending reply with output')
+    msg = msg if msg else ''
+    msg_size = min(MAX_MSG_SIZE, len(msg))
+
+    err_rep = err.to_bytes(1)
+    msg_size_rep = f'{msg_size:#0{PAD_MSG_SIZE}x}'
+
+    logger.debug(f'Sending reply: error_code {err} with output')
+    sock.send_multipart([err_rep, msg_size_rep.encode(), msg.encode()])
 
     write_stdout_log(script_stdout_log, msg)