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+"""Implementation of the ipaddres-based network types adaptation
+"""
+
+# psycopg/_ipaddress.py - Ipaddres-based network types adaptation
+#
+# Copyright (C) 2016-2019 Daniele Varrazzo <daniele.varrazzo@gmail.com>
+# Copyright (C) 2020-2021 The Psycopg Team
+#
+# psycopg2 is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# In addition, as a special exception, the copyright holders give
+# permission to link this program with the OpenSSL library (or with
+# modified versions of OpenSSL that use the same license as OpenSSL),
+# and distribute linked combinations including the two.
+#
+# You must obey the GNU Lesser General Public License in all respects for
+# all of the code used other than OpenSSL.
+#
+# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+# License for more details.
+
+from psycopg2.extensions import (
+ new_type, new_array_type, register_type, register_adapter, QuotedString)
+
+# The module is imported on register_ipaddress
+ipaddress = None
+
+# The typecasters are created only once
+_casters = None
+
+
+def register_ipaddress(conn_or_curs=None):
+ """
+ Register conversion support between `ipaddress` objects and `network types`__.
+
+ :param conn_or_curs: the scope where to register the type casters.
+ If `!None` register them globally.
+
+ After the function is called, PostgreSQL :sql:`inet` values will be
+ converted into `~ipaddress.IPv4Interface` or `~ipaddress.IPv6Interface`
+ objects, :sql:`cidr` values into into `~ipaddress.IPv4Network` or
+ `~ipaddress.IPv6Network`.
+
+ .. __: https://www.postgresql.org/docs/current/static/datatype-net-types.html
+ """
+ global ipaddress
+ import ipaddress
+
+ global _casters
+ if _casters is None:
+ _casters = _make_casters()
+
+ for c in _casters:
+ register_type(c, conn_or_curs)
+
+ for t in [ipaddress.IPv4Interface, ipaddress.IPv6Interface,
+ ipaddress.IPv4Network, ipaddress.IPv6Network]:
+ register_adapter(t, adapt_ipaddress)
+
+
+def _make_casters():
+ inet = new_type((869,), 'INET', cast_interface)
+ ainet = new_array_type((1041,), 'INET[]', inet)
+
+ cidr = new_type((650,), 'CIDR', cast_network)
+ acidr = new_array_type((651,), 'CIDR[]', cidr)
+
+ return [inet, ainet, cidr, acidr]
+
+
+def cast_interface(s, cur=None):
+ if s is None:
+ return None
+ # Py2 version force the use of unicode. meh.
+ return ipaddress.ip_interface(str(s))
+
+
+def cast_network(s, cur=None):
+ if s is None:
+ return None
+ return ipaddress.ip_network(str(s))
+
+
+def adapt_ipaddress(obj):
+ return QuotedString(str(obj))