Voice Agent API Integration: A Complete Developer Guide for Python, Node.js & REST

# Create and activate virtual environment
python -m venv voice_agent_env
source voice_agent_env/bin/activate  # Unix
.\voice_agent_env\Scripts\activate  # Windows

# Install required packages
pip install voice-agent-sdk requests asyncio

// Initialize project and install dependencies
npm init
npm install voice-agent-sdk @types/node dotenv

import os
from datetime import datetime, timedelta

class TokenManager:
    def __init__(self):
        self.api_key = os.getenv('VOICE_AGENT_API_KEY')
        self.token = None
        self.token_expiry = None
    
    async def get_valid_token(self):
        if not self.token or datetime.now() >= self.token_expiry:
            await self.rotate_token()
        return self.token

    async def rotate_token(self):
        # Implement token rotation logic
        pass

from typing import Dict, Any
import aiohttp
import logging

class VoiceAgentClient:
    def __init__(self, base_url: str, token_manager: TokenManager):
        self.base_url = base_url
        self.token_manager = token_manager
        self.session = aiohttp.ClientSession()
        
    async def process_voice_request(self, audio_data: bytes) -> Dict[str, Any]:
        token = await self.token_manager.get_valid_token()
        headers = {
            'Authorization': f'Bearer {token}',
            'Content-Type': 'application/octet-stream'
        }
        try:
            async with self.session.post(
                f'{self.base_url}/process',
                headers=headers,
                data=audio_data
            ) as response:
                return await response.json()
        except Exception as e:
            logging.error(f'Voice processing error: {str(e)}')
            raise

const { VoiceStream } = require('voice-agent-sdk');

class StreamHandler {
    constructor(chunkSize = 4096) {
        this.chunkSize = chunkSize;
        this.buffer = [];
    }

    async processStream(audioStream) {
        return new Promise((resolve, reject) => {
            audioStream.on('data', (chunk) => {
                this.buffer.push(chunk);
                if (this.buffer.length >= this.chunkSize) {
                    this.processBuffer();
                }
            });

            audioStream.on('end', () => {
                if (this.buffer.length > 0) {
                    this.processBuffer();
                }
                resolve();
            });

            audioStream.on('error', (error) => {
                reject(error);
            });
        });
    }
}

from fastapi import FastAPI, HTTPException
from prometheus_client import Counter, Histogram

app = FastAPI()

# Metrics
request_count = Counter('voice_agent_requests_total', 'Total voice agent requests')
processing_time = Histogram('voice_agent_processing_seconds', 'Time spent processing requests')

@app.get('/health')
async def health_check():
    try:
        # Perform API health check
        status = await check_api_status()
        return {'status': 'healthy', 'api_status': status}
    except Exception as e:
        raise HTTPException(status_code=503, detail=str(e))

from asyncio import Queue
from contextlib import asynccontextmanager

class ConnectionPool:
    def __init__(self, max_connections=100):
        self.connection_queue = Queue(maxsize=max_connections)
        self.active_connections = 0

    @asynccontextmanager
    async def get_connection(self):
        connection = await self.connection_queue.get()
        try:
            yield connection
        finally:
            await self.connection_queue.put(connection)