77 lines
2.8 KiB
Python
77 lines
2.8 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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from pathlib import Path
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from sqlalchemy.orm import sessionmaker, scoped_session
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from sqlalchemy import MetaData, Table
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from sqlalchemy.exc import (
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IllegalStateChangeError,
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NoInspectionAvailable,
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NoSuchTableError,
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)
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from cme.logger import cme_logger
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class database:
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def __init__(self, db_engine):
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self.CredentialsTable = None
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self.HostsTable = None
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self.db_engine = db_engine
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self.db_path = self.db_engine.url.database
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self.protocol = Path(self.db_path).stem.upper()
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self.metadata = MetaData()
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self.reflect_tables()
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session_factory = sessionmaker(bind=self.db_engine, expire_on_commit=True)
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Session = scoped_session(session_factory)
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# this is still named "conn" when it is the session object; TODO: rename
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self.conn = Session()
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@staticmethod
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def db_schema(db_conn):
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db_conn.execute(
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"""CREATE TABLE "credentials" (
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"id" integer PRIMARY KEY,
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"username" text,
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"password" text
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)"""
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)
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db_conn.execute(
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"""CREATE TABLE "hosts" (
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"id" integer PRIMARY KEY,
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"ip" text,
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"hostname" text,
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"port" integer
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)"""
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)
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def reflect_tables(self):
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with self.db_engine.connect() as conn:
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try:
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self.CredentialsTable = Table("credentials", self.metadata, autoload_with=self.db_engine)
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self.HostsTable = Table("hosts", self.metadata, autoload_with=self.db_engine)
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except (NoInspectionAvailable, NoSuchTableError):
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print(
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f"""
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[-] Error reflecting tables for the {self.protocol} protocol - this means there is a DB schema mismatch
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[-] This is probably because a newer version of CME is being ran on an old DB schema
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[-] Optionally save the old DB data (`cp {self.db_path} ~/cme_{self.protocol.lower()}.bak`)
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[-] Then remove the CME {self.protocol} DB (`rm -f {self.db_path}`) and run CME to initialize the new DB"""
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)
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exit()
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def shutdown_db(self):
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try:
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self.conn.close()
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# due to the async nature of CME, sometimes session state is a bit messy and this will throw:
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# Method 'close()' can't be called here; method '_connection_for_bind()' is already in progress and
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# this would cause an unexpected state change to <SessionTransactionState.CLOSED: 5>
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except IllegalStateChangeError as e:
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cme_logger.debug(f"Error while closing session db object: {e}")
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def clear_database(self):
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for table in self.metadata.sorted_tables:
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self.conn.execute(table.delete())
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