from nebula3.gclient.net import ConnectionPool
from nebula3.Config import Config


class NebulaConn:

    def initConnect(self, host, port, username, password, graphSpace):
        # 定义配置
        config = Config()
        config.max_connection_pool_size = 10
        # 初始化连接池
        connection_pool = ConnectionPool()
        # 如果给定的服务器正常，则返回true，否则返回false。
        status = connection_pool.init([(host, port)], config)
        # 用户名与密码
        session = connection_pool.get_session(username, password)
        session.execute('USE %s' %(graphSpace))
        return session, connection_pool

    def releaseConnectionPool(self, connection_pool):
        connection_pool.close()

    def releaseSession(self, session):
        session.release()