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import binascii
import os
import socket
import struct
import logging
from contextlib import contextmanager
from sqlalchemy import create_engine
from sqlalchemy import types, text
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
import ipaddress
logger = logging.getLogger(__name__)
DB_ADDRESS = os.getenv('DB_ADDRESS', '127.0.0.1')
DB_DATABASE = os.getenv('DB_DATABASE')
DB_PASSWORD = os.getenv('DB_PASSWORD')
DB_USER = os.getenv('DB_USER')
SQLALCHEMY_DATABASE_URL = 'postgresql://' + DB_USER + ':' + DB_PASSWORD + '@' + DB_ADDRESS + '/' + DB_DATABASE
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()
@contextmanager
def get_db_context():
"""Provide a transactional scope around a series of operations."""
db = SessionLocal()
try:
yield db
db.commit()
except:
db.rollback()
raise
finally:
db.close()
def get_db():
with get_db_context() as db:
yield db
def init_database():
try:
with get_db_context() as db:
with open("./init.sql") as file:
query = text(file.read())
db.execute(query)
except Exception as e:
logger.error(f"Failed to initialize database schema; message: {e}")
raise
class MAC(types.TypeDecorator):
impl = types.VARBINARY
def process_result_value(self, value, dialect):
if value is None:
return value
return binascii.hexlify(value, ':')
def process_bind_param(self, value, dialect):
if value is None:
return value
return binascii.unhexlify(value.replace(':', ''))
class SERIAL(types.TypeDecorator):
impl = types.VARBINARY
def process_result_value(self, value, dialect):
if value is None:
return value
r = bytes(value.hex(), 'utf-8')
return r
def process_bind_param(self, value, dialect):
if value is None:
return value
return bytes.fromhex(value.decode())
class IP(types.TypeDecorator):
impl = types.BIGINT
def process_result_value(self, value, dialect):
if value is None:
return value
return ipaddress.IPv4Address(socket.inet_ntoa(struct.pack('!L', value)))
def process_bind_param(self, value, dialect):
if value is None:
return value
packed_ip = socket.inet_aton(str(value))
return struct.unpack("!L", packed_ip)[0]