| 
 | 1 | +import psycopg2  | 
 | 2 | +from psycopg2._psycopg import ProgrammingError  | 
 | 3 | +from config import config  | 
 | 4 | + | 
 | 5 | +class data_warehouse(object):  | 
 | 6 | +    '''  | 
 | 7 | +    This class is used to get data from the Rightside data warehouse.  | 
 | 8 | +    The complete data warehouse documentation can be found at  | 
 | 9 | +        https://wiki.rightside.net/display/tnt/BI  | 
 | 10 | +    '''  | 
 | 11 | + | 
 | 12 | +    def __init__(self):  | 
 | 13 | +        """  | 
 | 14 | +        This method sets the data warehouse connection string from the config.  | 
 | 15 | +        """  | 
 | 16 | +        cnf = config()  | 
 | 17 | +        dbname = cnf.get('dw_dbname')  | 
 | 18 | +        user = cnf.get('dw_user')  | 
 | 19 | +        password = cnf.get('dw_password')  | 
 | 20 | +        host = cnf.get('dw_host')  | 
 | 21 | +        port = cnf.get('dw_port')  | 
 | 22 | + | 
 | 23 | +        self.dw_connection_string = \  | 
 | 24 | +         "dbname='{}' user='{}' password='{}' host='{}' port='{}'".format(dbname,user,password,host,port)  | 
 | 25 | + | 
 | 26 | + | 
 | 27 | +    def __call__(self, query):  | 
 | 28 | +        """  | 
 | 29 | +        This method calls the data warehouse API.  | 
 | 30 | +        The complete data warehouse documentation can be found at  | 
 | 31 | +            https://wiki.rightside.net/display/tnt/BI  | 
 | 32 | +        :param query: A string containing a valid redshift data warehouse query.  | 
 | 33 | +        :return: This depends on the query.  | 
 | 34 | +                 If the query returns records, as in a 'select' query, the records are returned.  | 
 | 35 | +                 If the query does not return records, as in an 'update' query, a unicode string is returned.  | 
 | 36 | +        """  | 
 | 37 | +        with psycopg2.connect(self.dw_connection_string) as conn:  | 
 | 38 | +            with conn.cursor() as curs:  | 
 | 39 | +                curs.execute(query)  | 
 | 40 | + | 
 | 41 | +                try:  | 
 | 42 | +                    records = curs.fetchall()  | 
 | 43 | +                    return records  | 
 | 44 | +                except ProgrammingError as e:  | 
 | 45 | +                    # This error occurs when there are no records to return,  | 
 | 46 | +                    # for example, queries such as inserts, updates, and unloads.  | 
 | 47 | +                    message = unicode(e)  | 
 | 48 | +                    if message == u'no results to fetch':  | 
 | 49 | +                        return message  | 
 | 50 | +                    else:  | 
 | 51 | +                        raise message  | 
 | 52 | + | 
 | 53 | + | 
 | 54 | + | 
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