Ryan Malloy
8b43927493
- Update all dependencies to latest versions (fastmcp, httpx, packaging, etc.) - Downgrade click from yanked 8.2.2 to stable 8.1.7 - Fix code formatting and linting issues with ruff - Most tests passing (2 test failures in dependency resolver need investigation)
276 lines
9.3 KiB
Python
276 lines
9.3 KiB
Python
"""PyPI API client for package information retrieval."""
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import asyncio
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import logging
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import re
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from typing import Any
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from urllib.parse import quote
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import httpx
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from .exceptions import (
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InvalidPackageNameError,
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NetworkError,
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PackageNotFoundError,
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PyPIServerError,
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RateLimitError,
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)
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logger = logging.getLogger(__name__)
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class PyPIClient:
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"""Async client for PyPI JSON API."""
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def __init__(
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self,
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base_url: str = "https://pypi.org/pypi",
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timeout: float = 30.0,
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max_retries: int = 3,
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retry_delay: float = 1.0,
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):
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"""Initialize PyPI client.
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Args:
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base_url: Base URL for PyPI API
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timeout: Request timeout in seconds
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max_retries: Maximum number of retry attempts
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retry_delay: Delay between retries in seconds
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"""
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self.base_url = base_url.rstrip("/")
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self.timeout = timeout
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self.max_retries = max_retries
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self.retry_delay = retry_delay
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# Simple in-memory cache
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self._cache: dict[str, dict[str, Any]] = {}
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self._cache_ttl = 300 # 5 minutes
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# HTTP client configuration
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self._client = httpx.AsyncClient(
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timeout=httpx.Timeout(timeout),
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headers={
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"User-Agent": "pypi-query-mcp-server/0.1.0",
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"Accept": "application/json",
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},
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follow_redirects=True,
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)
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async def __aenter__(self):
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"""Async context manager entry."""
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return self
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async def __aexit__(self, exc_type, exc_val, exc_tb):
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"""Async context manager exit."""
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await self.close()
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async def close(self):
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"""Close the HTTP client."""
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await self._client.aclose()
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def _validate_package_name(self, package_name: str) -> str:
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"""Validate and normalize package name.
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Args:
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package_name: Package name to validate
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Returns:
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Normalized package name
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Raises:
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InvalidPackageNameError: If package name is invalid
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"""
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if not package_name or not package_name.strip():
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raise InvalidPackageNameError(package_name)
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# Normalize package name (convert to lowercase, replace _ with -)
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normalized = re.sub(r"[-_.]+", "-", package_name.lower())
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# Basic validation - package names should contain only alphanumeric, hyphens, dots, underscores
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if not re.match(r"^[a-zA-Z0-9]([a-zA-Z0-9._-]*[a-zA-Z0-9])?$", package_name):
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raise InvalidPackageNameError(package_name)
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return normalized
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def _get_cache_key(self, package_name: str, endpoint: str = "info") -> str:
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"""Generate cache key for package data."""
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return f"{endpoint}:{package_name}"
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def _is_cache_valid(self, cache_entry: dict[str, Any]) -> bool:
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"""Check if cache entry is still valid."""
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import time
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return time.time() - cache_entry.get("timestamp", 0) < self._cache_ttl
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async def _make_request(self, url: str) -> dict[str, Any]:
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"""Make HTTP request with retry logic.
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Args:
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url: URL to request
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Returns:
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JSON response data
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Raises:
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NetworkError: For network-related errors
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PackageNotFoundError: When package is not found
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RateLimitError: When rate limit is exceeded
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PyPIServerError: For server errors
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"""
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last_exception = None
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for attempt in range(self.max_retries + 1):
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try:
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logger.debug(f"Making request to {url} (attempt {attempt + 1})")
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response = await self._client.get(url)
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# Handle different HTTP status codes
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if response.status_code == 200:
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return response.json()
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elif response.status_code == 404:
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# Extract package name from URL for better error message
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package_name = url.split("/")[-2] if "/" in url else "unknown"
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raise PackageNotFoundError(package_name)
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elif response.status_code == 429:
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retry_after = response.headers.get("Retry-After")
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retry_after_int = int(retry_after) if retry_after else None
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raise RateLimitError(retry_after_int)
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elif response.status_code >= 500:
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raise PyPIServerError(response.status_code)
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else:
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raise PyPIServerError(
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response.status_code,
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f"Unexpected status code: {response.status_code}",
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)
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except httpx.TimeoutException as e:
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last_exception = NetworkError(f"Request timeout: {e}", e)
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except httpx.NetworkError as e:
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last_exception = NetworkError(f"Network error: {e}", e)
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except (PackageNotFoundError, RateLimitError, PyPIServerError):
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# Don't retry these errors
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raise
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except Exception as e:
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last_exception = NetworkError(f"Unexpected error: {e}", e)
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# Wait before retry (except on last attempt)
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if attempt < self.max_retries:
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await asyncio.sleep(
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self.retry_delay * (2**attempt)
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) # Exponential backoff
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# If we get here, all retries failed
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raise last_exception
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async def get_package_info(
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self, package_name: str, version: str | None = None, use_cache: bool = True
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) -> dict[str, Any]:
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"""Get comprehensive package information from PyPI.
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Args:
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package_name: Name of the package to query
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version: Specific version to query (optional, defaults to latest)
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use_cache: Whether to use cached data if available
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Returns:
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Dictionary containing package information
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Raises:
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InvalidPackageNameError: If package name is invalid
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PackageNotFoundError: If package is not found or version doesn't exist
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NetworkError: For network-related errors
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"""
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normalized_name = self._validate_package_name(package_name)
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# Create cache key that includes version info
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cache_suffix = f"v{version}" if version else "latest"
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cache_key = self._get_cache_key(normalized_name, f"info_{cache_suffix}")
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# Check cache first
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if use_cache and cache_key in self._cache:
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cache_entry = self._cache[cache_key]
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if self._is_cache_valid(cache_entry):
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logger.debug(
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f"Using cached data for package: {normalized_name} version: {version or 'latest'}"
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)
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return cache_entry["data"]
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# Build URL - include version if specified
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if version:
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url = f"{self.base_url}/{quote(normalized_name)}/{quote(version)}/json"
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logger.info(
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f"Fetching package info for: {normalized_name} version {version}"
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)
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else:
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url = f"{self.base_url}/{quote(normalized_name)}/json"
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logger.info(f"Fetching package info for: {normalized_name} (latest)")
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try:
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data = await self._make_request(url)
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# Cache the result
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import time
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self._cache[cache_key] = {"data": data, "timestamp": time.time()}
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return data
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except PackageNotFoundError as e:
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if version:
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# More specific error message for version not found
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logger.error(
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f"Version {version} not found for package {normalized_name}"
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)
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raise PackageNotFoundError(
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f"Version {version} not found for package {normalized_name}"
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)
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else:
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logger.error(f"Failed to fetch package info for {normalized_name}: {e}")
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raise
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except Exception as e:
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logger.error(
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f"Failed to fetch package info for {normalized_name} version {version or 'latest'}: {e}"
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)
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raise
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async def get_package_versions(
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self, package_name: str, use_cache: bool = True
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) -> list[str]:
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"""Get list of available versions for a package.
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Args:
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package_name: Name of the package to query
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use_cache: Whether to use cached data if available
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Returns:
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List of version strings
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"""
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package_info = await self.get_package_info(
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package_name, version=None, use_cache=use_cache
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)
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releases = package_info.get("releases", {})
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return list(releases.keys())
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async def get_latest_version(
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self, package_name: str, use_cache: bool = True
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) -> str:
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"""Get the latest version of a package.
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Args:
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package_name: Name of the package to query
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use_cache: Whether to use cached data if available
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Returns:
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Latest version string
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"""
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package_info = await self.get_package_info(
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package_name, version=None, use_cache=use_cache
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)
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return package_info.get("info", {}).get("version", "")
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def clear_cache(self):
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"""Clear the internal cache."""
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self._cache.clear()
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logger.debug("Cache cleared")
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