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import json
import logging
from copy import deepcopy
from datetime import datetime
from pathlib import Path
from typing import Any, Dict, List, Optional
class LocalResourceService:
"""Centralized loader for the unified fallback registry."""
def __init__(self, resource_path: Path):
self.resource_path = Path(resource_path)
self._raw_data: Optional[Dict[str, Any]] = None
self._assets: Dict[str, Dict[str, Any]] = {}
self._market_overview: Dict[str, Any] = {}
self._logger = logging.getLogger(__name__)
# --------------------------------------------------------------------- #
# Loading helpers
# --------------------------------------------------------------------- #
def _ensure_loaded(self) -> None:
if self._raw_data is not None:
return
try:
with self.resource_path.open("r", encoding="utf-8") as handle:
data = json.load(handle)
except FileNotFoundError:
self._logger.warning("Fallback registry %s not found", self.resource_path)
data = {}
except json.JSONDecodeError as exc:
self._logger.error("Invalid fallback registry JSON: %s", exc)
data = {}
fallback_data = data.get("fallback_data") or {}
assets = fallback_data.get("assets") or {}
normalized_assets: Dict[str, Dict[str, Any]] = {}
for key, details in assets.items():
symbol = str(details.get("symbol") or key).upper()
asset_copy = deepcopy(details)
asset_copy["symbol"] = symbol
normalized_assets[symbol] = asset_copy
self._raw_data = data
self._assets = normalized_assets
self._market_overview = deepcopy(fallback_data.get("market_overview") or {})
def refresh(self) -> None:
"""Force reload from disk (used in tests)."""
self._raw_data = None
self._assets = {}
self._market_overview = {}
self._ensure_loaded()
# --------------------------------------------------------------------- #
# Registry level helpers
# --------------------------------------------------------------------- #
def get_registry(self) -> Dict[str, Any]:
self._ensure_loaded()
return deepcopy(self._raw_data or {})
def get_supported_symbols(self) -> List[str]:
self._ensure_loaded()
return sorted(self._assets.keys())
def has_fallback_data(self) -> bool:
self._ensure_loaded()
return bool(self._assets)
# --------------------------------------------------------------------- #
# Market data helpers
# --------------------------------------------------------------------- #
def _asset_to_market_record(self, asset: Dict[str, Any]) -> Dict[str, Any]:
price = asset.get("price", {})
return {
"id": asset.get("slug") or asset.get("symbol", "").lower(),
"symbol": asset.get("symbol"),
"name": asset.get("name"),
"current_price": price.get("current_price"),
"market_cap": price.get("market_cap"),
"market_cap_rank": asset.get("market_cap_rank"),
"total_volume": price.get("total_volume"),
"price_change_24h": price.get("price_change_24h"),
"price_change_percentage_24h": price.get("price_change_percentage_24h"),
"high_24h": price.get("high_24h"),
"low_24h": price.get("low_24h"),
"last_updated": price.get("last_updated"),
}
def get_top_prices(self, limit: int = 10) -> List[Dict[str, Any]]:
self._ensure_loaded()
if not self._assets:
return []
sorted_assets = sorted(
self._assets.values(),
key=lambda x: (x.get("market_cap_rank") or 9999, -(x.get("price", {}).get("market_cap") or 0)),
)
selected = sorted_assets[: max(1, limit)]
return [self._asset_to_market_record(asset) for asset in selected]
def get_prices_for_symbols(self, symbols: List[str]) -> List[Dict[str, Any]]:
self._ensure_loaded()
if not symbols or not self._assets:
return []
results: List[Dict[str, Any]] = []
for raw_symbol in symbols:
symbol = str(raw_symbol or "").upper()
asset = self._assets.get(symbol)
if asset:
results.append(self._asset_to_market_record(asset))
return results
def get_ticker_snapshot(self, symbol: str) -> Optional[Dict[str, Any]]:
self._ensure_loaded()
asset = self._assets.get(str(symbol or "").upper())
if not asset:
return None
price = asset.get("price", {})
return {
"symbol": asset.get("symbol"),
"price": price.get("current_price"),
"price_change_24h": price.get("price_change_24h"),
"price_change_percent_24h": price.get("price_change_percentage_24h"),
"high_24h": price.get("high_24h"),
"low_24h": price.get("low_24h"),
"volume_24h": price.get("total_volume"),
"quote_volume_24h": price.get("total_volume"),
}
def get_market_overview(self) -> Dict[str, Any]:
self._ensure_loaded()
if not self._assets:
return {}
overview = deepcopy(self._market_overview)
if not overview:
total_market_cap = sum(
(asset.get("price", {}) or {}).get("market_cap") or 0 for asset in self._assets.values()
)
total_volume = sum(
(asset.get("price", {}) or {}).get("total_volume") or 0 for asset in self._assets.values()
)
btc = self._assets.get("BTC", {})
btc_cap = (btc.get("price", {}) or {}).get("market_cap") or 0
overview = {
"total_market_cap": total_market_cap,
"total_volume_24h": total_volume,
"btc_dominance": (btc_cap / total_market_cap * 100) if total_market_cap else 0,
"active_cryptocurrencies": len(self._assets),
"markets": 500,
"market_cap_change_percentage_24h": 0,
}
# Enrich with derived leaderboards
gainers = sorted(
self._assets.values(),
key=lambda asset: (asset.get("price", {}) or {}).get("price_change_percentage_24h") or 0,
reverse=True,
)[:5]
losers = sorted(
self._assets.values(),
key=lambda asset: (asset.get("price", {}) or {}).get("price_change_percentage_24h") or 0,
)[:5]
volumes = sorted(
self._assets.values(),
key=lambda asset: (asset.get("price", {}) or {}).get("total_volume") or 0,
reverse=True,
)[:5]
overview["top_gainers"] = [self._asset_to_market_record(asset) for asset in gainers]
overview["top_losers"] = [self._asset_to_market_record(asset) for asset in losers]
overview["top_by_volume"] = [self._asset_to_market_record(asset) for asset in volumes]
overview["timestamp"] = overview.get("timestamp") or datetime.utcnow().isoformat()
return overview
def get_ohlcv(self, symbol: str, interval: str = "1h", limit: int = 100) -> List[Dict[str, Any]]:
self._ensure_loaded()
asset = self._assets.get(str(symbol or "").upper())
if not asset:
return []
ohlcv = (asset.get("ohlcv") or {}).get(interval) or []
if not ohlcv and interval != "1h":
# Provide 1h data for other intervals when nothing else is present
ohlcv = (asset.get("ohlcv") or {}).get("1h") or []
if limit and ohlcv:
return deepcopy(ohlcv[-limit:])
return deepcopy(ohlcv)
# --------------------------------------------------------------------- #
# Convenience helpers for testing / diagnostics
# --------------------------------------------------------------------- #
def describe(self) -> Dict[str, Any]:
"""Simple snapshot used in diagnostics/tests."""
self._ensure_loaded()
return {
"resource_path": str(self.resource_path),
"assets": len(self._assets),
"supported_symbols": self.get_supported_symbols(),
}
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