pgtoolkit/toolbase.py
author Radek Brich <radek.brich@devl.cz>
Tue, 11 Dec 2012 11:25:06 +0100
changeset 53 4a049a5af657
parent 51 bdc44f96cb0b
child 56 94e091c23ebb
permissions -rw-r--r--
Update PgDiff: Support SQL patch for constraints. Fix changes of column default value.
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import argparse
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import logging
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import re
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from pgtoolkit import pgmanager, pgbrowser, 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 BadArgsError(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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        self.target_isolation_level = None
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    def init(self):
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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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    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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        logger_notices = logging.getLogger('pgmanager_notices')
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        logger_notices.addHandler(handler)
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        logger_notices.setLevel(logging.DEBUG)
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        if self.args.debug:
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            logger_sql = logging.getLogger('pgmanager_sql')
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            logger_sql.addHandler(handler)
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            logger_sql.setLevel(logging.DEBUG)
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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,
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                    isolation_level=self.target_isolation_level,
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                    **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,
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                    isolation_level=self.target_isolation_level,
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                    dsn=dsn)
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                return True
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    def prepare_conns_from_cmdline_args(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)
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        self.prepare_conns_from_cmdline_args('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)
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        self.prepare_conns_from_cmdline_args('src', 'dst')
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   119
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class SrcDstTablesTool(SrcDstTool):
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    def __init__(self, name, desc):
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        SrcDstTool.__init__(self, name, desc)
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        self.parser.add_argument('-t', '--src-table', metavar='source_table',
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            dest='srctable', type=str, default='', help='Source table name.')
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        self.parser.add_argument('-s', '--src-schema', metavar='source_schema',
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            dest='srcschema', type=str, default='', help='Source schema name (default=public).')
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        self.parser.add_argument('--dst-table', metavar='destination_table',
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            dest='dsttable', type=str, default='', help='Destination table name (default=source_table).')
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        self.parser.add_argument('--dst-schema', metavar='destination_schema',
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            dest='dstschema', type=str, default='', help='Destination schema name (default=source_schema).')
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        self.parser.add_argument('--regex', action='store_true', help="Use RE in schema or table name.")
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    def init(self):
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        SrcDstTool.init(self)
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        self.schema1 = self.args.srcschema
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        self.table1 = self.args.srctable
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        self.schema2 = self.args.dstschema
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        self.table2 = self.args.dsttable
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        # check regex - it applies to source name, dest name must not be specified
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        # applies to only one - schema or table name
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        if self.args.regex:
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            if self.table2 or (self.schema2 and not self.table1):
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                raise BadArgsError('Cannot specify both --regex and --dst-schema, --dst-table.')
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   146
        # schema defaults to public
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        if self.table1 and not self.schema1:
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            self.schema1 = 'public'
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        # dest defaults to source
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        if not self.schema2:
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            self.schema2 = self.schema1
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        if not self.table2:
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            self.table2 = self.table1
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   154
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    def tables(self):
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        '''Generator. Yields schema1, table1, schema2, table2.'''
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        srcconn = self.pgm.get_conn('src')
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        try:
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            srcbrowser = pgbrowser.PgBrowser(srcconn)
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            if self.args.regex:
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                if not self.table1:
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                    # all tables from schemas defined by regex
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                    for item in self._iter_schemas_regex(srcbrowser, self.schema1):
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                        yield item
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   165
                else:
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   166
                    # all tables defined by regex
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                    for item in self._iter_tables_regex(srcbrowser, self.schema1, self.schema2, self.table1):
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   168
                        yield item
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   169
            else:
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                if not self.table1:
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                    if not self.schema1:
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   172
                        # all tables from all schemas
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                        for item in self._iter_schemas_regex(srcbrowser, self.schema1):
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   174
                            yield item
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   175
                    else:
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   176
                        # all tables from specified schema
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                        for item in self._iter_tables_regex(srcbrowser, self.schema1, self.schema2, self.table1):
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                            yield item
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   179
                else:
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                    # one table
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                    yield (self.schema1, self.table1, self.schema2, self.table2)
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   182
        finally:
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   183
            self.pgm.put_conn(srcconn, 'src')
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   184
34
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   185
    def _iter_schemas_regex(self, browser, regex):
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        for schema in browser.list_schemas():
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   187
            if schema['system']:
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   188
                continue
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   189
            schemaname = schema['name']
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   190
            if re.match(regex, schemaname):
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   191
                for item in self._iter_tables_regex(browser, schemaname, schemaname, ''):
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   192
                    yield item
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   193
34
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   194
    def _iter_tables_regex(self, browser, schema1, schema2, regex):
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   195
        for table in browser.list_tables(schema1):
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   196
            tablename = table['name']
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   197
            if re.match(regex, tablename):
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                yield (schema1, tablename, schema2, tablename)
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   199