""" API Key Pool Manager for DocStrange. Manages a pool of Nanonets API keys with automatic rotation on rate limit (429). """ import os import json import time import threading from pathlib import Path from typing import Optional, List, Dict, Any import logging logger = logging.getLogger(__name__) class KeyStatus: ACTIVE = "active" RATE_LIMITED = "rate_limited" EXPIRED = "expired" class ApiKeyEntry: """Represents a single API key in the pool with its state.""" def __init__(self, key: str, source: str = "manual"): self.key = key self.source = source # "manual", "env", "config", "credentials" self.status = KeyStatus.ACTIVE self.rate_limited_at = None self.reset_at = None # When the rate limit resets (epoch time) self.requests_made = 0 self.last_used = None def mark_rate_limited(self, reset_after_seconds: int = 3600): """Mark this key as rate-limited.""" self.status = KeyStatus.RATE_LIMITED self.rate_limited_at = time.time() self.reset_at = time.time() + reset_after_seconds logger.warning(f"API key {self.key[:8]}... rate limited, resets at {self.reset_at}") def is_available(self) -> bool: """Check if this key is available for use.""" if self.status == KeyStatus.ACTIVE: return True if self.status == KeyStatus.RATE_LIMITED and self.reset_at: if time.time() >= self.reset_at: self.status = KeyStatus.ACTIVE self.rate_limited_at = None self.reset_at = None return True return False def record_use(self): """Record that this key was used.""" self.requests_made += 1 self.last_used = time.time() class ApiKeyPool: """ Manages a pool of API keys with automatic rotation. When a key hits rate limit (429), it's marked as unavailable and the next key in the pool is tried. When all keys are exhausted, signals fallback. """ _instance = None _lock = threading.Lock() def __init__(self): self._keys: List[ApiKeyEntry] = [] self._current_index = 0 self._lock_pool = threading.Lock() self._config_path = Path.home() / ".docstrange" / "api_keys.json" self._load_config() @classmethod def get_instance(cls) -> "ApiKeyPool": """Get singleton instance.""" if cls._instance is None: with cls._lock: if cls._instance is None: cls._instance = cls() return cls._instance def _load_config(self): """Load API keys from config file.""" try: if self._config_path.exists(): with open(self._config_path, 'r') as f: config = json.load(f) keys = config.get("api_keys", []) for key_entry in keys: if isinstance(key_entry, str): self.add_key(key_entry, source="config") elif isinstance(key_entry, dict) and "key" in key_entry: self.add_key(key_entry["key"], source=key_entry.get("source", "config")) logger.info(f"Loaded {len(self._keys)} API keys from config") except Exception as e: logger.warning(f"Failed to load API key config: {e}") # Also check environment variable for a comma-separated list of keys env_keys = os.environ.get('NANONETS_API_KEYS', '') if env_keys: for key in env_keys.split(','): key = key.strip() if key: self.add_key(key, source="env") def save_config(self): """Save API keys to config file.""" try: config_dir = self._config_path.parent config_dir.mkdir(exist_ok=True) keys_data = [] for entry in self._keys: keys_data.append({ "key": entry.key, "source": entry.source }) with open(self._config_path, 'w') as f: json.dump({"api_keys": keys_data}, f, indent=2) os.chmod(self._config_path, 0o600) logger.info(f"Saved {len(keys_data)} API keys to config") except Exception as e: logger.error(f"Failed to save API key config: {e}") def add_key(self, key: str, source: str = "manual") -> bool: """Add an API key to the pool.""" with self._lock_pool: # Check for duplicates for entry in self._keys: if entry.key == key: return False self._keys.append(ApiKeyEntry(key, source)) logger.info(f"Added API key from {source} to pool (total: {len(self._keys)})") return True def remove_key(self, key: str) -> bool: """Remove an API key from the pool.""" with self._lock_pool: for i, entry in enumerate(self._keys): if entry.key == key: self._keys.pop(i) return True return False def get_next_key(self) -> Optional[str]: """ Get the next available API key. Returns None if all keys are rate-limited. """ with self._lock_pool: if not self._keys: return None # Try to find an available key starting from current index total_keys = len(self._keys) for i in range(total_keys): idx = (self._current_index + i) % total_keys if self._keys[idx].is_available(): self._current_index = idx self._keys[idx].record_use() return self._keys[idx].key return None def mark_key_rate_limited(self, key: str, reset_after_seconds: int = 3600): """Mark a specific key as rate-limited.""" with self._lock_pool: for entry in self._keys: if entry.key == key: entry.mark_rate_limited(reset_after_seconds) break def has_available_keys(self) -> bool: """Check if any API keys are available.""" with self._lock_pool: return any(k.is_available() for k in self._keys) def get_pool_stats(self) -> Dict[str, Any]: """Get statistics about the key pool.""" with self._lock_pool: stats = { "total_keys": len(self._keys), "available": 0, "rate_limited": 0, "total_requests": 0 } for key in self._keys: if key.is_available(): stats["available"] += 1 else: stats["rate_limited"] += 1 stats["total_requests"] += key.requests_made return stats def get_all_keys(self) -> List[str]: """Get all API keys (masked for display).""" with self._lock_pool: return [f"{k.key[:8]}...{k.key[-4:]}" if len(k.key) > 12 else "***" for k in self._keys] # Convenience functions def get_pool() -> ApiKeyPool: """Get the API key pool singleton.""" return ApiKeyPool.get_instance() def add_api_key(key: str): """Add an API key to the pool.""" pool = get_pool() pool.add_key(key) pool.save_config() def remove_api_key(key: str): """Remove an API key from the pool.""" pool = get_pool() pool.remove_key(key) pool.save_config() def list_api_keys() -> List[str]: """List all API keys (masked).""" pool = get_pool() return pool.get_all_keys() def get_available_key() -> Optional[str]: """Get the next available API key.""" return get_pool().get_next_key()