ui: Add websocket notifications.

basicswap/contrib/websocket_server/thread.py

@@ -0,0 +1,38 @@
+import threading
+
+
+class ThreadWithLoggedException(threading.Thread):
+    """
+    Similar to Thread but will log exceptions to passed logger.
+
+    Args:
+        logger: Logger instance used to log any exception in child thread
+
+    Exception is also reachable via <thread>.exception from the main thread.
+    """
+
+    DIVIDER = "*"*80
+
+    def __init__(self, *args, **kwargs):
+        try:
+            self.logger = kwargs.pop("logger")
+        except KeyError:
+            raise Exception("Missing 'logger' in kwargs")
+        super().__init__(*args, **kwargs)
+        self.exception = None
+
+    def run(self):
+        try:
+            if self._target is not None:
+                self._target(*self._args, **self._kwargs)
+        except Exception as exception:
+            thread = threading.current_thread()
+            self.exception = exception
+            self.logger.exception(f"{self.DIVIDER}\nException in child thread {thread}: {exception}\n{self.DIVIDER}")
+        finally:
+            del self._target, self._args, self._kwargs
+
+
+class WebsocketServerThread(ThreadWithLoggedException):
+    """Dummy wrapper to make debug messages a bit more readable"""
+    pass