Ping the RPC api before using the wot CLI

static-data/official-plugins/wot/cli/__init__.py

@@ -1,7 +1,10 @@
 import tty
 import sys
 import subprocess
+import traceback
 
+import ujson as json
+import result
 import requests
 import requests_unixsocket
 
@@ -23,10 +26,28 @@ def list_idens():
     print('Listing identities')
     payload = dict(rpc_payload)
     payload['method'] = 'wot.serialize_identity_set'
-    payload['params'].clear()
-    print(onionrplugins.pluginapis.plugin_apis['rpc.rpc_client'](payload).text)
+    del payload['params']
+    print(onionrplugins.pluginapis.plugin_apis['rpc.rpc_client'](json=payload).text)
 
 
+def ping_api() -> result.Result:
+    payload = dict(rpc_payload)
+    payload['method'] = 'ping'
+    del payload['params']
+    try:
+        _ping_res = onionrplugins.pluginapis.plugin_apis['rpc.rpc_client'](json=payload).text
+    except requests.exceptions.ConnectionError:
+        logging.debug(traceback.format_exc())
+        return result.Err('Could not connect to Onionr RPC server. Please ensure the RPC plugin is enabled and the Onionr daemon is running')
+    except:
+        logging.error(traceback.format_exc())
+        return result.Err('Unknown error occurred while connecting to Onionr RPC server')
+    _ping_res = json.loads(_ping_res)
+    if _ping_res['result'] == 'pong':
+        return result.Ok()
+    else:
+        return result.Err('API not responding. Try restarting Onionr')
+
 
 main_menu = {
     'l': (list_idens, 'list trusted identities'),
@@ -40,11 +61,17 @@ def main_ui():
     except KeyError:
         logging.error("Web of trust CLI requires RPC plugin to be enabled")
         return
+
+    ping_result: result.Result = ping_api()
+    if not isinstance(ping_result, result.Ok):
+        logging.error(ping_result)
+        return
+
     while True:
         # move cursor to the beginning
         print('\r', end='')
-        key = sys.stdin.read(1)
         try:
+            key = sys.stdin.read(1)
             main_menu[key][0]()
         except KeyError:
             pass