error checking and reconnect

nostr/relay.py

@@ -1,4 +1,5 @@
 import json
+import time
 from threading import Lock
 from websocket import WebSocketApp
 from .event import Event
@@ -29,6 +30,11 @@ class Relay:
         self.policy = policy
         self.message_pool = message_pool
         self.subscriptions = subscriptions
+        self.connected: bool = False
+        self.reconnect: bool = True
+        self.error_counter: int = 0
+        self.error_threshold: int = 0
+        self.ssl_options: dict = {}
         self.lock = Lock()
         self.ws = WebSocketApp(
             url,
@@ -38,14 +44,26 @@ class Relay:
             on_close=self._on_close,
         )
 
-    def connect(self, ssl_options: dict = None):
-        self.ws.run_forever(sslopt=ssl_options)
+    def connect(self, ssl_options: dict = {}):
+        self.ssl_options = ssl_options
+        self.ws.run_forever(sslopt=self.ssl_options)
 
     def close(self):
         self.ws.close()
 
+    def check_reconnect(self):
+        try:
+            self.close()
+        except:
+            pass
+        self.connected = False
+        if self.reconnect:
+            time.sleep(1)
+            self.connect(self.ssl_options)
+
     def publish(self, message: str):
-        self.ws.send(message)
+        if self.connected:
+            self.ws.send(message)
 
     def add_subscription(self, id, filters: Filters):
         with self.lock:
@@ -71,9 +89,12 @@ class Relay:
         }
 
     def _on_open(self, class_obj):
+        self.connected = True
         pass
 
     def _on_close(self, class_obj, status_code, message):
+        self.connected = False
+        self.check_reconnect()
         pass
 
     def _on_message(self, class_obj, message: str):
@@ -81,7 +102,12 @@ class Relay:
             self.message_pool.add_message(message, self.url)
 
     def _on_error(self, class_obj, error):
-        pass
+        self.connected = False
+        self.error_counter += 1
+        if self.error_threshold and self.error_counter > self.error_threshold:
+            pass
+        else:
+            self.check_reconnect()
 
     def _is_valid_message(self, message: str) -> bool:
         message = message.strip("\n")
@@ -117,7 +143,7 @@ class Relay:
             with self.lock:
                 subscription = self.subscriptions[subscription_id]
 
-            if not subscription.filters.match(event):
+            if subscription.filters and not subscription.filters.match(event):
                 return False
 
         return True