tools/server/views.py

import io
import os
import time
from http import HTTPStatus

import numpy as np
import ormsgpack
import soundfile as sf
import torch
from kui.asgi import (
    Body,
    HTTPException,
    HttpView,
    JSONResponse,
    Routes,
    StreamResponse,
    request,
)
from loguru import logger
from typing_extensions import Annotated

from fish_speech.utils.schema import (
    ServeASRRequest,
    ServeASRResponse,
    ServeChatRequest,
    ServeTTSRequest,
    ServeVQGANDecodeRequest,
    ServeVQGANDecodeResponse,
    ServeVQGANEncodeRequest,
    ServeVQGANEncodeResponse,
)
from tools.server.agent import get_response_generator
from tools.server.api_utils import (
    buffer_to_async_generator,
    get_content_type,
    inference_async,
)
from tools.server.inference import inference_wrapper as inference
from tools.server.model_manager import ModelManager
from tools.server.model_utils import (
    batch_asr,
    batch_vqgan_decode,
    cached_vqgan_batch_encode,
)

MAX_NUM_SAMPLES = int(os.getenv("NUM_SAMPLES", 1))

routes = Routes()


@routes.http("/v1/health")
class Health(HttpView):
    @classmethod
    async def get(cls):
        return JSONResponse({"status": "ok"})

    @classmethod
    async def post(cls):
        return JSONResponse({"status": "ok"})


@routes.http.post("/v1/vqgan/encode")
async def vqgan_encode(req: Annotated[ServeVQGANEncodeRequest, Body(exclusive=True)]):
    # Get the model from the app
    model_manager: ModelManager = request.app.state.model_manager
    decoder_model = model_manager.decoder_model

    # Encode the audio
    start_time = time.time()
    tokens = cached_vqgan_batch_encode(decoder_model, req.audios)
    logger.info(f"[EXEC] VQGAN encode time: {(time.time() - start_time) * 1000:.2f}ms")

    # Return the response
    return ormsgpack.packb(
        ServeVQGANEncodeResponse(tokens=[i.tolist() for i in tokens]),
        option=ormsgpack.OPT_SERIALIZE_PYDANTIC,
    )


@routes.http.post("/v1/vqgan/decode")
async def vqgan_decode(req: Annotated[ServeVQGANDecodeRequest, Body(exclusive=True)]):
    # Get the model from the app
    model_manager: ModelManager = request.app.state.model_manager
    decoder_model = model_manager.decoder_model

    # Decode the audio
    tokens = [torch.tensor(token, dtype=torch.int) for token in req.tokens]
    start_time = time.time()
    audios = batch_vqgan_decode(decoder_model, tokens)
    logger.info(f"[EXEC] VQGAN decode time: {(time.time() - start_time) * 1000:.2f}ms")
    audios = [audio.astype(np.float16).tobytes() for audio in audios]

    # Return the response
    return ormsgpack.packb(
        ServeVQGANDecodeResponse(audios=audios),
        option=ormsgpack.OPT_SERIALIZE_PYDANTIC,
    )


@routes.http.post("/v1/asr")
async def asr(req: Annotated[ServeASRRequest, Body(exclusive=True)]):
    # Get the model from the app
    model_manager: ModelManager = request.app.state.model_manager
    asr_model = model_manager.asr_model
    lock = request.app.state.lock

    # Perform ASR
    start_time = time.time()
    audios = [np.frombuffer(audio, dtype=np.float16) for audio in req.audios]
    audios = [torch.from_numpy(audio).float() for audio in audios]

    if any(audios.shape[-1] >= 30 * req.sample_rate for audios in audios):
        raise HTTPException(status_code=400, content="Audio length is too long")

    transcriptions = batch_asr(
        asr_model, lock, audios=audios, sr=req.sample_rate, language=req.language
    )
    logger.info(f"[EXEC] ASR time: {(time.time() - start_time) * 1000:.2f}ms")

    # Return the response
    return ormsgpack.packb(
        ServeASRResponse(transcriptions=transcriptions),
        option=ormsgpack.OPT_SERIALIZE_PYDANTIC,
    )


@routes.http.post("/v1/tts")
async def tts(req: Annotated[ServeTTSRequest, Body(exclusive=True)]):
    # Get the model from the app
    app_state = request.app.state
    model_manager: ModelManager = app_state.model_manager
    engine = model_manager.tts_inference_engine
    sample_rate = engine.decoder_model.spec_transform.sample_rate

    # Check if the text is too long
    if app_state.max_text_length > 0 and len(req.text) > app_state.max_text_length:
        raise HTTPException(
            HTTPStatus.BAD_REQUEST,
            content=f"Text is too long, max length is {app_state.max_text_length}",
        )

    # Check if streaming is enabled
    if req.streaming and req.format != "wav":
        raise HTTPException(
            HTTPStatus.BAD_REQUEST,
            content="Streaming only supports WAV format",
        )

    # Perform TTS
    if req.streaming:
        return StreamResponse(
            iterable=inference_async(req, engine),
            headers={
                "Content-Disposition": f"attachment; filename=audio.{req.format}",
            },
            content_type=get_content_type(req.format),
        )
    else:
        fake_audios = next(inference(req, engine))
        buffer = io.BytesIO()
        sf.write(
            buffer,
            fake_audios,
            sample_rate,
            format=req.format,
        )

        return StreamResponse(
            iterable=buffer_to_async_generator(buffer.getvalue()),
            headers={
                "Content-Disposition": f"attachment; filename=audio.{req.format}",
            },
            content_type=get_content_type(req.format),
        )


@routes.http.post("/v1/chat")
async def chat(req: Annotated[ServeChatRequest, Body(exclusive=True)]):
    # Check that the number of samples requested is correct
    if req.num_samples < 1 or req.num_samples > MAX_NUM_SAMPLES:
        raise HTTPException(
            HTTPStatus.BAD_REQUEST,
            content=f"Number of samples must be between 1 and {MAX_NUM_SAMPLES}",
        )

    # Get the type of content provided
    content_type = request.headers.get("Content-Type", "application/json")
    json_mode = "application/json" in content_type

    # Get the models from the app
    model_manager: ModelManager = request.app.state.model_manager
    llama_queue = model_manager.llama_queue
    tokenizer = model_manager.tokenizer
    config = model_manager.config

    device = request.app.state.device

    # Get the response generators
    response_generator = get_response_generator(
        llama_queue, tokenizer, config, req, device, json_mode
    )

    # Return the response in the correct format
    if req.streaming is False:
        result = response_generator()
        if json_mode:
            return JSONResponse(result.model_dump())
        else:
            return ormsgpack.packb(result, option=ormsgpack.OPT_SERIALIZE_PYDANTIC)

    return StreamResponse(
        iterable=response_generator(), content_type="text/event-stream"
    )