Source code for airflow.contrib.hooks.snowflake_hook

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import snowflake.connector

from airflow.hooks.dbapi_hook import DbApiHook


[docs]class SnowflakeHook(DbApiHook): """ Interact with Snowflake. get_sqlalchemy_engine() depends on snowflake-sqlalchemy """
[docs] conn_name_attr = 'snowflake_conn_id'
[docs] default_conn_name = 'snowflake_default'
[docs] supports_autocommit = True
def __init__(self, *args, **kwargs): super(SnowflakeHook, self).__init__(*args, **kwargs) self.account = kwargs.pop("account", None) self.warehouse = kwargs.pop("warehouse", None) self.database = kwargs.pop("database", None)
[docs] def _get_conn_params(self): """ one method to fetch connection params as a dict used in get_uri() and get_connection() """ conn = self.get_connection(self.snowflake_conn_id) account = conn.extra_dejson.get('account', None) warehouse = conn.extra_dejson.get('warehouse', None) database = conn.extra_dejson.get('database', None) conn_config = { "user": conn.login, "password": conn.password or '', "schema": conn.schema or '', "database": self.database or database or '', "account": self.account or account or '', "warehouse": self.warehouse or warehouse or '' } return conn_config
[docs] def get_uri(self): """ override DbApiHook get_uri method for get_sqlalchemy_engine() """ conn_config = self._get_conn_params() uri = 'snowflake://{user}:{password}@{account}/{database}/' uri += '{schema}?warehouse={warehouse}' return uri.format( **conn_config)
[docs] def get_conn(self): """ Returns a snowflake.connection object """ conn_config = self._get_conn_params() conn = snowflake.connector.connect(**conn_config) return conn
[docs] def _get_aws_credentials(self): """ returns aws_access_key_id, aws_secret_access_key from extra intended to be used by external import and export statements """ if self.snowflake_conn_id: connection_object = self.get_connection(self.snowflake_conn_id) if 'aws_secret_access_key' in connection_object.extra_dejson: aws_access_key_id = connection_object.extra_dejson.get( 'aws_access_key_id') aws_secret_access_key = connection_object.extra_dejson.get( 'aws_secret_access_key') return aws_access_key_id, aws_secret_access_key
[docs] def set_autocommit(self, conn, autocommit): conn.autocommit(autocommit)