add extension_sync_helloworld.py

Author: wwj718

extensions_v2/extension_sync_helloworld.py

@@ -0,0 +1,28 @@
+import time
+from codelab_adapter.core_extension import Extension
+
+
+class SyncHelloWorldExtension(Extension):
+    def __init__(self):
+        super().__init__()
+        self.EXTENSION_ID = "eim"
+
+    def send_message_to_scratch(self, payload):
+        message = self.message_template()
+        message["payload"] = payload
+        self.publish(message)
+
+    def extension_message_handle(self, topic, payload):
+        self.logger.info(f'the message payload from scratch: {payload}')
+        content = payload["content"]
+        if type(content) == str:
+            content_send_to_scratch = content[::-1] # 反转字符串
+            time.sleep(1)
+            payload["content"] = content_send_to_scratch
+            self.send_message_to_scratch(payload)
+
+    def run(self):
+        while self._running:
+            time.sleep(1)
+
+export = SyncHelloWorldExtension