create bot when first need

bridge/bridge.py

@@ -1,3 +1,4 @@
+from common.log import logger
 from bot import bot_factory
 from common.singleton import singleton
 from voice import voice_factory
@@ -6,16 +7,24 @@ from voice import voice_factory
 @singleton
 class Bridge(object):
     def __init__(self):
-        self.bots = {
-            "chat": bot_factory.create_bot("chatGPT"),
-            "voice_to_text": voice_factory.create_voice("openai"),
-            # "text_to_voice": voice_factory.create_voice("baidu")
+        self.btype={
+            "chat": "chatGPT",
+            "voice_to_text": "openai",
+            "text_to_voice": "baidu"
         }
-        try:
-            self.bots["text_to_voice"] = voice_factory.create_voice("baidu")
-        except ModuleNotFoundError as e:
-            print(e)
+        self.bots={}
 
+    def getbot(self,typename):
+        if self.bots.get(typename) is None:
+            logger.info("create bot {} for {}".format(self.btype[typename],typename))
+            if typename == "text_to_voice":
+                self.bots[typename] = voice_factory.create_voice(self.btype[typename])
+            elif typename == "voice_to_text":
+                self.bots[typename] = voice_factory.create_voice(self.btype[typename])
+            elif typename == "chat":
+                self.bots[typename] = bot_factory.create_bot(self.btype[typename])
+        return self.bots[typename]
+    
     # 以下所有函数需要得到一个reply字典，格式如下：
     # reply["type"] = "ERROR" / "TEXT" / "VOICE" / ...
     # reply["content"] = reply的内容
@@ -28,3 +37,4 @@ class Bridge(object):
 
     def fetch_text_to_voice(self, text):
         return self.bots["text_to_voice"].textToVoice(text)
+