pgtoolkit/toolbase.py
author Radek Brich <radek.brich@devl.cz>
Tue, 06 Dec 2011 16:45:29 +0100
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parent 20 73f0d53fef6b
child 29 8636719a30f6
permissions -rw-r--r--
Add test for delayedquery.
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import argparse
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import logging
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from pgtoolkit import pgmanager, config
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from pgtoolkit.coloredformatter import ColoredFormatter
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from pgtoolkit.highlight import highlight
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class ConnectionInfoNotFound(Exception):    
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    pass
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class ToolBase:
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    def __init__(self, name, desc):
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        self.parser = argparse.ArgumentParser(description=desc)
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        self.parser.add_argument('-d', dest='debug', action='store_true',
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            help='Debug mode - print database queries.')
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        self.config = config.ConfigParser()
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        self.config.add_argument('databases', type=dict)
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        self.config.add_argument('meta_db')
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        self.config.add_argument('meta_query')
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        self.pgm = pgmanager.get_instance()
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    def init(self, *args):
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        self.config.load('pgtoolkit.conf')
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        self.args = self.parser.parse_args()
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        self.init_logging()
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        self.prepare_conns(*args)
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    def init_logging(self):
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        # logging
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        handler = logging.StreamHandler()
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        format = ColoredFormatter(highlight(1,7,0)+'%(asctime)s %(levelname)-5s'+highlight(0)+' %(message)s', '%H:%M:%S')
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        handler.setFormatter(format)
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        handler.setLevel(logging.DEBUG)
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        self.log = logging.getLogger('main')
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        self.log.addHandler(handler)
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        self.log.setLevel(logging.DEBUG)
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        if self.args.debug:
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            handler = logging.StreamHandler()
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            handler.setFormatter(format)
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            handler.setLevel(logging.DEBUG)
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            logger = logging.getLogger('pgmanager')
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            logger.addHandler(handler)
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    def prepare_conn_from_metadb(self, name, lookup_name):
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        '''Create connection in pgmanager using meta DB.
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        name -- Name for connection in pgmanager.
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        lookup_name -- Name of connection in meta DB.
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        '''
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        with self.pgm.cursor('meta') as curs:
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            curs.execute(self.config.meta_query, [lookup_name])
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            row = curs.fetchone_dict()
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            curs.connection.commit()
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            if row:
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                self.pgm.create_conn(name=name, **row)
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                return True
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    def prepare_conn_from_config(self, name, lookup_name):
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        '''Create connection in pgmanager using info in config.databases.'''
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        if self.config.databases:
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            if lookup_name in self.config.databases:
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                dsn = self.config.databases[lookup_name]
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                self.pgm.create_conn(name=name, dsn=dsn)
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                return True
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    def prepare_conns(self, *pgm_names):
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        if self.config.meta_db:
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            self.pgm.create_conn(name='meta', dsn=self.config.meta_db)
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        for name in pgm_names:
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            lookup_name = self.args.__dict__[name]
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            found = self.prepare_conn_from_config(name, lookup_name)
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            if not found and self.config.meta_db:
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                found = self.prepare_conn_from_metadb(name, lookup_name)
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            if not found:
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                raise ConnectionInfoNotFound('Connection name "%s" not found in config nor in meta DB.' % lookup_name)
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        if self.config.meta_db:
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            self.pgm.close_conn('meta')
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class SimpleTool(ToolBase):
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    def __init__(self, name, desc):
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        ToolBase.__init__(self, name, desc)        
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        self.parser.add_argument('target', metavar='target', type=str, help='Target database')
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    def init(self):
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        ToolBase.init(self, 'target')
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class SrcDstTool(ToolBase):
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    def __init__(self, name, desc):
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        ToolBase.__init__(self, name, desc)        
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        self.parser.add_argument('src', metavar='source', type=str, help='Source database')
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        self.parser.add_argument('dst', metavar='destination', type=str, help='Destination database')
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    def init(self):
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        ToolBase.init(self, 'src', 'dst')
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