# -*- coding: utf-8 -*-

#

# PgStats - browse database statistics

#

# Copyright (c) 2011  Radek Brich <radek.brich@devl.cz>

#

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

#

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

#

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

# THE SOFTWARE.

class PgStats:

    def __init__(self, conn=None):

        self.conn = conn

    def setconn(self, conn=None):

        self.conn = conn

    def _query(self, query, *args):

        try:

            curs = self.conn.cursor()

            curs.execute(query, args)

            curs.connection.commit()

            rows = curs.fetchall()

            return [dict(zip([desc[0] for desc in curs.description], row)) for row in rows]

        finally:

            curs.close()

    def list_long_queries(self, longer_than='1m'):

        return self._query('''SELECT datname, procpid, usename, current_query AS query,

            waiting, xact_start, query_start, backend_start

            FROM pg_stat_activity

            WHERE current_query <> '<IDLE>' AND query_start < now() - interval %s;''',

            longer_than)