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Unified Async API Client - Replace mixed sync/async HTTP calls
Implements retry logic, error handling, and logging consistently
"""
import aiohttp
import asyncio
import inspect
import logging
from typing import Optional, Dict, Any, List
from datetime import datetime, timedelta
import traceback
import config
logger = logging.getLogger(__name__)
class AsyncAPIClient:
"""
Unified async HTTP client with retry logic and error handling
Replaces mixed requests/aiohttp calls throughout the codebase
"""
def __init__(
self,
timeout: int = config.REQUEST_TIMEOUT,
max_retries: int = config.MAX_RETRIES,
retry_delay: float = 2.0
):
"""
Initialize async API client
Args:
timeout: Request timeout in seconds
max_retries: Maximum number of retry attempts
retry_delay: Base delay between retries (exponential backoff)
"""
self.timeout = aiohttp.ClientTimeout(total=timeout)
self.max_retries = max_retries
self.retry_delay = retry_delay
self._session: Optional[aiohttp.ClientSession] = None
async def __aenter__(self):
"""Async context manager entry"""
self._session = aiohttp.ClientSession(timeout=self.timeout)
return self
async def __aexit__(self, exc_type, exc_val, exc_tb):
"""Async context manager exit"""
if self._session:
await self._session.close()
async def get(
self,
url: str,
params: Optional[Dict[str, Any]] = None,
headers: Optional[Dict[str, str]] = None
) -> Optional[Dict[str, Any]]:
"""
Make async GET request with retry logic
Args:
url: Request URL
params: Query parameters
headers: HTTP headers
Returns:
JSON response as dictionary or None on failure
"""
if not self._session:
raise RuntimeError("Client must be used as async context manager")
for attempt in range(self.max_retries):
try:
logger.debug(f"GET {url} (attempt {attempt + 1}/{self.max_retries})")
response = await self._session.get(url, params=params, headers=headers)
response.raise_for_status()
data = await response.json()
logger.debug(f"GET {url} successful")
return data
except aiohttp.ClientResponseError as e:
logger.warning(f"HTTP {e.status} error on {url}: {e.message}")
if e.status in (404, 400, 401, 403):
# Don't retry client errors
return None
# Retry on server errors (5xx)
if attempt < self.max_retries - 1:
await asyncio.sleep(self.retry_delay * (2 ** attempt))
continue
return None
except aiohttp.ClientConnectionError as e:
logger.warning(f"Connection error on {url}: {e}")
if attempt < self.max_retries - 1:
await asyncio.sleep(self.retry_delay * (2 ** attempt))
continue
return None
except asyncio.TimeoutError:
logger.warning(f"Timeout on {url} (attempt {attempt + 1})")
if attempt < self.max_retries - 1:
await asyncio.sleep(self.retry_delay * (2 ** attempt))
continue
return None
except Exception as e:
logger.error(f"Unexpected error on {url}: {e}\n{traceback.format_exc()}")
return None
return None
async def post(
self,
url: str,
data: Optional[Dict[str, Any]] = None,
json: Optional[Dict[str, Any]] = None,
headers: Optional[Dict[str, str]] = None
) -> Optional[Dict[str, Any]]:
"""
Make async POST request with retry logic
Args:
url: Request URL
data: Form data
json: JSON payload
headers: HTTP headers
Returns:
JSON response as dictionary or None on failure
"""
if not self._session:
raise RuntimeError("Client must be used as async context manager")
for attempt in range(self.max_retries):
try:
logger.debug(f"POST {url} (attempt {attempt + 1}/{self.max_retries})")
response = await self._session.post(
url, data=data, json=json, headers=headers
)
response.raise_for_status()
response_data = await response.json()
logger.debug(f"POST {url} successful")
return response_data
except aiohttp.ClientResponseError as e:
logger.warning(f"HTTP {e.status} error on {url}: {e.message}")
if e.status in (404, 400, 401, 403):
return None
if attempt < self.max_retries - 1:
await asyncio.sleep(self.retry_delay * (2 ** attempt))
continue
return None
except aiohttp.ClientConnectionError as e:
logger.warning(f"Connection error on {url}: {e}")
if attempt < self.max_retries - 1:
await asyncio.sleep(self.retry_delay * (2 ** attempt))
continue
return None
except asyncio.TimeoutError:
logger.warning(f"Timeout on {url} (attempt {attempt + 1})")
if attempt < self.max_retries - 1:
await asyncio.sleep(self.retry_delay * (2 ** attempt))
continue
return None
except Exception as e:
logger.error(f"Error on POST {url}: {e}")
return None
return None
async def gather_requests(
self,
urls: List[str],
params_list: Optional[List[Optional[Dict[str, Any]]]] = None
) -> List[Optional[Dict[str, Any]]]:
"""
Make multiple async GET requests in parallel
Args:
urls: List of URLs to fetch
params_list: Optional list of params for each URL
Returns:
List of responses (None for failed requests)
"""
if params_list is None:
params_list = [None] * len(urls)
tasks = [
self.get(url, params=params)
for url, params in zip(urls, params_list)
]
results = await asyncio.gather(*tasks, return_exceptions=True)
# Convert exceptions to None
return [
result if not isinstance(result, Exception) else None
for result in results
]
# ==================== CONVENIENCE FUNCTIONS ====================
async def safe_api_call(
url: str,
params: Optional[Dict[str, Any]] = None,
headers: Optional[Dict[str, str]] = None,
timeout: int = config.REQUEST_TIMEOUT
) -> Optional[Dict[str, Any]]:
"""
Convenience function for single async API call
Args:
url: Request URL
params: Query parameters
headers: HTTP headers
timeout: Request timeout
Returns:
JSON response or None on failure
"""
async with AsyncAPIClient(timeout=timeout) as client:
return await client.get(url, params=params, headers=headers)
async def parallel_api_calls(
urls: List[str],
params_list: Optional[List[Optional[Dict[str, Any]]]] = None,
timeout: int = config.REQUEST_TIMEOUT
) -> List[Optional[Dict[str, Any]]]:
"""
Convenience function for parallel async API calls
Args:
urls: List of URLs
params_list: Optional params for each URL
timeout: Request timeout
Returns:
List of responses (None for failures)
"""
async with AsyncAPIClient(timeout=timeout) as client:
return await client.gather_requests(urls, params_list)
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