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class StreamInterface(Interface):
    def __init__(self, signature, *, path):
        super().__init__(signature, path = path)

        if signature.backpressure == False:
            self.ready = C(1)
    
    async def recv(self):
        await self.ready.set(1)

        await Settle()
        while not (await self.valid.get()):
            await Tick()
            await Settle()
        
        payload = await self.payload.get()

        await Tick()
        await self.ready.set(0)

        return payload

    async def send(self, value):
        await self.payload.set(value)

        await self.valid.set(1)

        await Settle()
        while not (await self.ready.get()):
            await Tick()
            await Settle()

        await Tick()
        await self.valid.set(0)

class Stream(Signature):
    def __init__(self, payload_shape, *, backpressure = True):
        super().__init__({
            'payload': Out(payload_shape),
            'valid': Out(1),
            'ready': In(1),
        })

        self.backpressure = backpressure

    def create(self, *, path = ()):
        return StreamInterface(self, path = path)