wwan: T7487: move json/wait_for imports into their only callers

Requested by c-po: json.loads and wait_for were only used by
_modem_owning_port() and modem_index()'s wait branch respectively, so
importing them at module level cost every other caller of this module an
import it does not need.

1 files changed, 4 insertions, 2 deletions

diff --git a/python/vyos/utils/wwan.py b/python/vyos/utils/wwan.py
index 6b708e39c..af719571d 100644
--- a/python/vyos/utils/wwan.py
+++ b/python/vyos/utils/wwan.py
@@ -25,11 +25,9 @@ would have done.
 
 import os
 
-from json import loads
 from time import sleep
 
 from vyos.utils.dict import dict_search
-from vyos.utils.misc import wait_for
 from vyos.utils.process import call
 from vyos.utils.process import cmdl
 from vyos.utils.process import DEVNULL
@@ -58,6 +56,8 @@ admin_disconnect_dir = '/run/vyos-wwan'
 def _modem_owning_port(ifname: str):
     """Return the ModemManager modem index whose own port list includes
     ifname, or None if no currently-known modem owns it."""
+    from json import loads
+
     try:
         modem_list = loads(cmdl(['mmcli', '--list-modems', '--output-json'])).get(
             'modem-list', []
@@ -100,6 +100,8 @@ def modem_index(ifname: str, wait: bool = False):
     if not wait:
         return _modem_owning_port(ifname)
 
+    from vyos.utils.misc import wait_for
+
     index = None
 
     def _resolve():