from abc import ABC, abstractmethod

class ASR(ABC):
    @abstractmethod
    async def connect(self):
        
        pass

    @abstractmethod
    async def send_audio(self, audio_data: bytes):
        
        pass

    @abstractmethod
    async def send_end(self):
        
        pass

    @abstractmethod
    async def receive_results(self):
        
        pass

    @abstractmethod
    async def close(self):
        
        pass