def __init__(self, app=None, url='/hooks'):
        self._hooks = {}
        if app is not None:
            self.init_app(app, url=url)
Get a dictionary with mappings of roles and boto ec2 instances in the
dataset/ETHPy150Open nickfrostatx/flask-hookserver/flask_hookserver.py/Hooks.__init__--crossover with--dataset/ETHPy150Open winhamwr/neckbeard/neckbeard/cloud_provisioners/aws/ec2.py/Ec2NodeDeployment._get_node_role_map