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90 lines
2.8 KiB
Python
90 lines
2.8 KiB
Python
"""Implementation of the ipaddres-based network types adaptation
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"""
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# psycopg/_ipaddress.py - Ipaddres-based network types adaptation
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#
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# Copyright (C) 2016 Daniele Varrazzo <daniele.varrazzo@gmail.com>
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#
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# psycopg2 is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# In addition, as a special exception, the copyright holders give
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# permission to link this program with the OpenSSL library (or with
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# modified versions of OpenSSL that use the same license as OpenSSL),
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# and distribute linked combinations including the two.
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#
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# You must obey the GNU Lesser General Public License in all respects for
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# all of the code used other than OpenSSL.
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#
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# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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# License for more details.
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from psycopg2.extensions import (
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new_type, new_array_type, register_type, register_adapter, QuotedString)
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# The module is imported on register_ipaddress
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ipaddress = None
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# The typecasters are created only once
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_casters = None
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def register_ipaddress(conn_or_curs=None):
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"""
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Register conversion support between `ipaddress` objects and `network types`__.
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:param conn_or_curs: the scope where to register the type casters.
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If `!None` register them globally.
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After the function is called, PostgreSQL :sql:`inet` values will be
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converted into `~ipaddress.IPv4Interface` or `~ipaddress.IPv6Interface`
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objects, :sql:`cidr` values into into `~ipaddress.IPv4Network` or
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`~ipaddress.IPv6Network`.
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.. __: https://www.postgresql.org/docs/current/static/datatype-net-types.html
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"""
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global ipaddress
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import ipaddress
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global _casters
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if _casters is None:
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_casters = _make_casters()
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for c in _casters:
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register_type(c, conn_or_curs)
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for t in [ipaddress.IPv4Interface, ipaddress.IPv6Interface,
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ipaddress.IPv4Network, ipaddress.IPv6Network]:
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register_adapter(t, adapt_ipaddress)
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def _make_casters():
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inet = new_type((869,), 'INET', cast_interface)
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ainet = new_array_type((1041,), 'INET[]', inet)
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cidr = new_type((650,), 'CIDR', cast_network)
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acidr = new_array_type((651,), 'CIDR[]', cidr)
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return [inet, ainet, cidr, acidr]
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def cast_interface(s, cur=None):
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if s is None:
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return None
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# Py2 version force the use of unicode. meh.
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return ipaddress.ip_interface(unicode(s))
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def cast_network(s, cur=None):
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if s is None:
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return None
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return ipaddress.ip_network(unicode(s))
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def adapt_ipaddress(obj):
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return QuotedString(str(obj))
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