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import json
import logging
from dataclasses import dataclass, asdict
from datetime import datetime
from pathlib import Path
from typing import List, Dict
from loader import load_items
from esi.api import get_region_orders
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
ORDERS_CACHE = Path(__file__).resolve().parent.parent / "cache" / "orders_snapshot_orders.json"
REGION_IDS = [
10000002, # The Forge
10000016, # Lonetrek
10000030, # Heimatar
10000033, # The Citadel
10000032, # Sinq Laison
10000042, # Metropolis
10000064, # Essence
10000037, # Everyshore
10000043, # Domain
10000036, # Devoid
10000052, # Kador
10000067, # Genesis
10000068, # Verge Vendor
10000001, # Derelik
10000020, # Tash-Murkon
]
@dataclass
class Order:
order_id: int
region_id: int
location_id: int
type_id: int
is_buy_order: bool
price: float
issued: datetime
volume_remain: int
item_name: str = ''
item_cargo_volume: float = 1.0
class Market:
"""
Manages market orders, including fetching, updating, and caching.
"""
def __init__(self):
self.orders: List[Order] = []
self.expires_times: Dict[int, datetime] = {}
def get_orders(self) -> List[Order]:
"""Retrieves the current list of market orders."""
self.update_orders()
return self.orders
def update_orders(self) -> List[int]:
"""
Updates market orders by fetching new data for expired regions.
Returns:
A list of region IDs that were updated.
"""
updated_orders: List[Order] = []
regions_updated: List[int] = []
for region_id in REGION_IDS:
if self.check_expired(region_id):
logger.info(f"Downloading orders for region {region_id}")
orders = self.download_orders(region_id)
updated_orders.extend(orders)
regions_updated.append(region_id)
else:
# Include existing orders for this region
updated_orders.extend(
[order for order in self.orders if order.region_id == region_id]
)
self.orders = updated_orders
return regions_updated
def check_expired(self, region_id: int) -> bool:
"""
Checks if the cached orders for a region have expired.
Args:
region_id: The ID of the region to check.
Returns:
True if the orders have expired or are not cached, False otherwise.
"""
current_time = datetime.utcnow()
expiry_time = self.expires_times.get(region_id)
return expiry_time is None or current_time >= expiry_time
def download_orders(self, region_id: int) -> List[Order]:
"""
Downloads orders for a given region and updates the expiry time.
Args:
region_id: The ID of the region to download orders for.
Returns:
A list of Order instances for the region.
"""
raw_orders, expiry = get_region_orders(region_id)
expiry_time = datetime.strptime(expiry, "%a, %d %b %Y %H:%M:%S %Z")
self.expires_times[region_id] = expiry_time
orders = self.add_item_info_to_orders(raw_orders)
return orders
def add_item_info_to_orders(self, raw_orders: List[Dict]) -> List[Order]:
"""
Enhances raw order data with item information and converts them into Order instances.
Args:
raw_orders: A list of raw order dictionaries from the API.
Returns:
A list of Order instances with additional item information.
"""
items = load_items()
orders: List[Order] = []
for raw_order in raw_orders:
item_info = items.get(raw_order['type_id'], {})
order = Order(
order_id=raw_order['order_id'],
region_id=raw_order['region_id'],
location_id=raw_order['location_id'],
type_id=raw_order['type_id'],
is_buy_order=raw_order['is_buy_order'],
price=raw_order['price'],
issued=datetime.strptime(raw_order['issued'], "%Y-%m-%dT%H:%M:%S%z"),
volume_remain=raw_order['volume_remain'],
item_name=item_info.get('type_name', f"Not found: {raw_order['type_id']}"),
item_cargo_volume=item_info.get('volume', 1.0),
)
orders.append(order)
return orders
def cache_orders(self) -> None:
"""Caches the current list of orders to a JSON file."""
try:
with ORDERS_CACHE.open("w", encoding="utf-8") as f:
# Serialize orders to dictionaries and handle datetime serialization
orders_data = [self._serialize_order(order) for order in self.orders]
json.dump(orders_data, f, ensure_ascii=False, indent=4)
logger.info("Orders cached successfully.")
except IOError as e:
logger.error(f"Error caching orders: {e}")
def load_orders(self) -> List[Order]:
"""
Loads orders from the cache file.
Returns:
A list of Order instances loaded from the cache.
"""
try:
with ORDERS_CACHE.open("r", encoding="utf-8") as f:
orders_data = json.load(f)
self.orders = [self._deserialize_order(data) for data in orders_data]
logger.info("Orders loaded from cache successfully.")
except (IOError, json.JSONDecodeError) as e:
logger.error(f"Error loading orders from cache: {e}")
self.orders = []
return self.orders
def _serialize_order(self, order: Order) -> Dict:
"""
Serializes an Order instance to a dictionary suitable for JSON serialization.
Args:
order: The Order instance to serialize.
Returns:
A dictionary representation of the Order.
"""
order_dict = asdict(order)
# Convert datetime objects to ISO format strings
order_dict['issued'] = order.issued.isoformat()
return order_dict
def _deserialize_order(self, data: Dict) -> Order:
"""
Deserializes a dictionary into an Order instance.
Args:
data: The dictionary representation of an Order.
Returns:
An Order instance.
"""
data['issued'] = datetime.fromisoformat(data['issued'])
return Order(**data)
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