pipecat/examples/features/features-service-switcher.py

#
# Copyright (c) 2024-2026, Daily
#
# SPDX-License-Identifier: BSD 2-Clause License
#

import asyncio
import os

from dotenv import load_dotenv
from loguru import logger

from pipecat.adapters.schemas.function_schema import FunctionSchema
from pipecat.adapters.schemas.tools_schema import ToolsSchema
from pipecat.audio.vad.silero import SileroVADAnalyzer
from pipecat.frames.frames import LLMRunFrame, ManuallySwitchServiceFrame
from pipecat.pipeline.llm_switcher import LLMSwitcher
from pipecat.pipeline.pipeline import Pipeline
from pipecat.pipeline.runner import PipelineRunner
from pipecat.pipeline.service_switcher import ServiceSwitcher
from pipecat.pipeline.task import PipelineParams, PipelineTask
from pipecat.processors.aggregators.llm_context import LLMContext
from pipecat.processors.aggregators.llm_response_universal import (
    LLMContextAggregatorPair,
    LLMUserAggregatorParams,
)
from pipecat.runner.types import RunnerArguments
from pipecat.runner.utils import create_transport
from pipecat.services.cartesia.stt import CartesiaSTTService
from pipecat.services.cartesia.tts import CartesiaTTSService
from pipecat.services.deepgram.stt import DeepgramSTTService
from pipecat.services.deepgram.tts import DeepgramTTSService
from pipecat.services.google.llm import GoogleLLMService
from pipecat.services.llm_service import FunctionCallParams
from pipecat.services.openai.llm import OpenAILLMService
from pipecat.transports.base_transport import BaseTransport, TransportParams
from pipecat.transports.daily.transport import DailyParams
from pipecat.transports.websocket.fastapi import FastAPIWebsocketParams

load_dotenv(override=True)


# "Classic" function
async def fetch_weather_from_api(params: FunctionCallParams):
    await params.result_callback({"conditions": "nice", "temperature": "75"})


# "Direct" function
async def get_restaurant_recommendation(params: FunctionCallParams, location: str):
    """
    Get a restaurant recommendation.

    Args:
        location (str): The city and state, e.g. "San Francisco, CA".
    """
    await params.result_callback({"name": "The Golden Dragon"})


# We use lambdas to defer transport parameter creation until the transport
# type is selected at runtime.
transport_params = {
    "daily": lambda: DailyParams(
        audio_in_enabled=True,
        audio_out_enabled=True,
    ),
    "twilio": lambda: FastAPIWebsocketParams(
        audio_in_enabled=True,
        audio_out_enabled=True,
    ),
    "webrtc": lambda: TransportParams(
        audio_in_enabled=True,
        audio_out_enabled=True,
    ),
}


async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
    logger.info(f"Starting bot")

    weather_function = FunctionSchema(
        name="get_current_weather",
        description="Get the current weather",
        properties={
            "location": {
                "type": "string",
                "description": "The city and state, e.g. San Francisco, CA",
            },
            "format": {
                "type": "string",
                "enum": ["celsius", "fahrenheit"],
                "description": "The temperature unit to use. Infer this from the user's location.",
            },
        },
        required=["location", "format"],
    )

    stt_cartesia = CartesiaSTTService(api_key=os.getenv("CARTESIA_API_KEY"))
    stt_deepgram = DeepgramSTTService(api_key=os.getenv("DEEPGRAM_API_KEY"))
    # Uses ServiceSwitcherStrategyManual by default
    stt_switcher = ServiceSwitcher(services=[stt_cartesia, stt_deepgram])

    tts_cartesia = CartesiaTTSService(
        api_key=os.getenv("CARTESIA_API_KEY"),
        settings=CartesiaTTSService.Settings(
            voice="71a7ad14-091c-4e8e-a314-022ece01c121",  # British Reading Lady
        ),
    )
    tts_deepgram = DeepgramTTSService(
        api_key=os.getenv("DEEPGRAM_API_KEY"),
        settings=DeepgramTTSService.Settings(
            voice="aura-2-helena-en",
        ),
    )
    # Uses ServiceSwitcherStrategyManual by default
    tts_switcher = ServiceSwitcher(services=[tts_cartesia, tts_deepgram])

    system_prompt = "You are a helpful assistant in a voice conversation. Your responses will be spoken aloud, so avoid emojis, bullet points, or other formatting that can't be spoken. Respond to what the user said in a creative, helpful, and brief way."

    llm_openai = OpenAILLMService(
        api_key=os.getenv("OPENAI_API_KEY"),
        settings=OpenAILLMService.Settings(system_instruction=system_prompt),
    )
    llm_google = GoogleLLMService(
        api_key=os.getenv("GOOGLE_API_KEY"),
        settings=GoogleLLMService.Settings(system_instruction=system_prompt),
    )
    # Uses ServiceSwitcherStrategyManual by default
    llm_switcher = LLMSwitcher(llms=[llm_openai, llm_google])
    # Register a "classic" function
    llm_switcher.register_function("get_current_weather", fetch_weather_from_api)
    # Register a "direct" function
    llm_switcher.register_direct_function(get_restaurant_recommendation)

    tools = ToolsSchema(standard_tools=[weather_function, get_restaurant_recommendation])

    context = LLMContext(tools=tools)
    user_aggregator, assistant_aggregator = LLMContextAggregatorPair(
        context,
        user_params=LLMUserAggregatorParams(vad_analyzer=SileroVADAnalyzer()),
    )

    pipeline = Pipeline(
        [
            transport.input(),  # Transport user input
            stt_switcher,
            user_aggregator,  # User responses
            llm_switcher,  # LLM
            tts_switcher,  # TTS
            transport.output(),  # Transport bot output
            assistant_aggregator,  # Assistant spoken responses
        ]
    )

    task = PipelineTask(
        pipeline,
        params=PipelineParams(
            enable_metrics=True,
            enable_usage_metrics=True,
        ),
        idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
    )

    @transport.event_handler("on_client_connected")
    async def on_client_connected(transport, client):
        logger.info(f"Client connected")
        # Kick off the conversation.
        context.add_message(
            {"role": "developer", "content": "Please introduce yourself to the user."}
        )
        await task.queue_frames([LLMRunFrame()])
        await asyncio.sleep(15)
        print(f"Switching to {stt_deepgram}")
        await task.queue_frames([ManuallySwitchServiceFrame(service=stt_deepgram)])
        await asyncio.sleep(15)
        print(f"Switching to {llm_google}")
        await task.queue_frames([ManuallySwitchServiceFrame(service=llm_google)])
        await asyncio.sleep(15)
        print(f"Switching to {tts_deepgram}")
        await task.queue_frames([ManuallySwitchServiceFrame(service=tts_deepgram)])

    @transport.event_handler("on_client_disconnected")
    async def on_client_disconnected(transport, client):
        logger.info(f"Client disconnected")
        await task.cancel()

    runner = PipelineRunner(handle_sigint=runner_args.handle_sigint)

    await runner.run(task)


async def bot(runner_args: RunnerArguments):
    """Main bot entry point compatible with Pipecat Cloud."""
    transport = await create_transport(runner_args, transport_params)
    await run_bot(transport, runner_args)


if __name__ == "__main__":
    from pipecat.runner.run import main

    main()