from __future__ import annotations

import pickle
import socket
from copy import copy, deepcopy
from unittest.mock import Mock, patch

import pytest

from kombu import Connection, Consumer, Producer, parse_url
from kombu.connection import Resource
from kombu.exceptions import OperationalError
from kombu.utils.functional import lazy
from t.mocks import TimeoutingTransport, Transport


class test_connection_utils:

    def setup_method(self):
        self.url = 'amqp://user:pass@localhost:5672/my/vhost'
        self.nopass = 'amqp://user:**@localhost:5672/my/vhost'
        self.expected = {
            'transport': 'amqp',
            'userid': 'user',
            'password': 'pass',
            'hostname': 'localhost',
            'port': 5672,
            'virtual_host': 'my/vhost',
        }
        self.pg_url = 'sqla+postgresql://test:password@yms-pg/yms'
        self.pg_nopass = 'sqla+postgresql://test:**@yms-pg/yms'

    def test_parse_url(self):
        result = parse_url(self.url)
        assert result == self.expected

    def test_parse_generated_as_uri(self):
        conn = Connection(self.url)
        info = conn.info()
        for k, v in self.expected.items():
            assert info[k] == v
        # by default almost the same- no password
        assert conn.as_uri() == self.nopass
        assert conn.as_uri(include_password=True) == self.url

    def test_as_uri_when_prefix(self):
        pytest.importorskip('redis')
        conn = Connection('redis+socket:///var/spool/x/y/z/redis.sock')
        assert conn.as_uri() == 'redis+socket:///var/spool/x/y/z/redis.sock'

    def test_as_uri_when_mongodb(self):
        pytest.importorskip('pymongo')
        x = Connection('mongodb://localhost')
        assert x.as_uri()

    def test_bogus_scheme(self):
        with pytest.raises(KeyError):
            Connection('bogus://localhost:7421').transport

    def assert_info(self, conn, **fields):
        info = conn.info()
        for field, expected in fields.items():
            assert info[field] == expected

    @pytest.mark.parametrize('url,expected', [
        ('amqp://user:pass@host:10000/vhost',
         {'userid': 'user', 'password': 'pass', 'hostname': 'host',
          'port': 10000, 'virtual_host': 'vhost'}),
        ('amqp://user%61:%61pass@ho%61st:10000/v%2fhost',
         {'userid': 'usera', 'password': 'apass', 'hostname': 'hoast',
          'port': 10000, 'virtual_host': 'v/host'}),
        ('amqp://',
         {'userid': 'guest', 'password': 'guest', 'hostname': 'localhost',
          'port': 5672, 'virtual_host': '/'}),
        ('amqp://:@/',
         {'userid': 'guest', 'password': 'guest', 'hostname': 'localhost',
          'port': 5672, 'virtual_host': '/'}),
        ('amqp://user@/',
         {'userid': 'user', 'password': 'guest', 'hostname': 'localhost',
          'port': 5672, 'virtual_host': '/'}),
        ('amqp://user:pass@/',
         {'userid': 'user', 'password': 'pass', 'hostname': 'localhost',
          'port': 5672, 'virtual_host': '/'}),
        ('amqp://host',
         {'userid': 'guest', 'password': 'guest', 'hostname': 'host',
          'port': 5672, 'virtual_host': '/'}),
        ('amqp://:10000',
         {'userid': 'guest', 'password': 'guest', 'hostname': 'localhost',
          'port': 10000, 'virtual_host': '/'}),
        ('amqp:///vhost',
         {'userid': 'guest', 'password': 'guest', 'hostname': 'localhost',
          'port': 5672, 'virtual_host': 'vhost'}),
        ('amqp://host/',
         {'userid': 'guest', 'password': 'guest', 'hostname': 'host',
          'port': 5672, 'virtual_host': '/'}),
        ('amqp://host/%2f',
         {'userid': 'guest', 'password': 'guest', 'hostname': 'host',
          'port': 5672, 'virtual_host': '/'}),
    ])
    def test_rabbitmq_example_urls(self, url, expected):
        # see Appendix A of http://www.rabbitmq.com/uri-spec.html
        self.assert_info(Connection(url), **expected)

    @pytest.mark.parametrize('url,expected', [
        ('sqs://user:pass@',
         {'userid': None, 'password': None, 'hostname': None,
          'port': None, 'virtual_host': '/'}),
        ('sqs://',
         {'userid': None, 'password': None, 'hostname': None,
          'port': None, 'virtual_host': '/'}),
    ])
    def test_sqs_example_urls(self, url, expected, caplog):
        pytest.importorskip('boto3')
        self.assert_info(Connection('sqs://'), **expected)
        assert not caplog.records

    @pytest.mark.skip('TODO: urllib cannot parse ipv6 urls')
    def test_url_IPV6(self):
        self.assert_info(
            Connection('amqp://[::1]'),
            userid='guest', password='guest', hostname='[::1]',
            port=5672, virtual_host='/',
        )

    def test_connection_copy(self):
        conn = Connection(self.url, alternates=['amqp://host'])
        clone = deepcopy(conn)
        assert clone.alt == ['amqp://host']

    def test_parse_generated_as_uri_pg(self):
        pytest.importorskip('sqlalchemy')
        conn = Connection(self.pg_url)
        assert conn.as_uri() == self.pg_nopass
        assert conn.as_uri(include_password=True) == self.pg_url


class test_Connection:

    def setup_method(self):
        self.conn = Connection(port=5672, transport=Transport)

    def test_establish_connection(self):
        conn = self.conn
        assert not conn.connected
        conn.connect()
        assert conn.connected
        assert conn.connection.connected
        assert conn.host == 'localhost:5672'
        channel = conn.channel()
        assert channel.open
        assert conn.drain_events() == 'event'
        _connection = conn.connection
        conn.close()
        assert not _connection.connected
        assert isinstance(conn.transport, Transport)

    def test_reuse_connection(self):
        conn = self.conn
        assert conn.connect() is conn.connection is conn.connect()

    def test_connect_no_transport_options(self):
        conn = self.conn
        conn._ensure_connection = Mock()

        conn.connect()
        # ensure_connection must be called to return immidiately
        # and fail with transport exception
        conn._ensure_connection.assert_called_with(
            max_retries=1, reraise_as_library_errors=False
        )

    def test_connect_transport_options(self):
        conn = self.conn
        conn.transport_options = {
            'max_retries': 1,
            'interval_start': 2,
            'interval_step': 3,
            'interval_max': 4,
            'ignore_this': True
        }
        conn._ensure_connection = Mock()

        conn.connect()
        # connect() is ignoring transport options
        # ensure_connection must be called to return immidiately
        # and fail with transport exception
        conn._ensure_connection.assert_called_with(
            max_retries=1, reraise_as_library_errors=False
        )

    def test_multiple_urls(self):
        conn1 = Connection('amqp://foo;amqp://bar')
        assert conn1.hostname == 'foo'
        assert conn1.alt == ['amqp://foo', 'amqp://bar']

        conn2 = Connection(['amqp://foo', 'amqp://bar'])
        assert conn2.hostname == 'foo'
        assert conn2.alt == ['amqp://foo', 'amqp://bar']

    def test_collect(self):
        connection = Connection('memory://')
        trans = connection._transport = Mock(name='transport')
        _collect = trans._collect = Mock(name='transport._collect')
        _close = connection._close = Mock(name='connection._close')
        connection.declared_entities = Mock(name='decl_entities')
        uconn = connection._connection = Mock(name='_connection')
        connection.collect()

        _close.assert_not_called()
        _collect.assert_called_with(uconn)
        connection.declared_entities.clear.assert_called_with()
        assert trans.client is None
        assert connection._transport is None
        assert connection._connection is None

    def test_prefer_librabbitmq_over_amqp_when_available(self):
        with patch('kombu.connection.supports_librabbitmq',
                   return_value=True):
            connection = Connection('amqp://')

        assert connection.transport_cls == 'librabbitmq'

    def test_select_amqp_when_librabbitmq_is_not_available(self):
        with patch('kombu.connection.supports_librabbitmq',
                   return_value=False):
            connection = Connection('amqp://')

        assert connection.transport_cls == 'amqp'

    def test_collect_no_transport(self):
        connection = Connection('memory://')
        connection._transport = None
        connection._do_close_self = Mock()
        connection._do_close_transport = Mock()
        connection.collect()
        connection._do_close_self.assert_called_with()
        connection._do_close_transport.assert_called_with()

        connection._do_close_self.side_effect = socket.timeout()
        connection.collect()

    def test_collect_transport_gone(self):
        connection = Connection('memory://')
        uconn = connection._connection = Mock(name='conn._conn')
        trans = connection._transport = Mock(name='transport')
        collect = trans._collect = Mock(name='transport._collect')

        def se(conn):
            connection._transport = None
        collect.side_effect = se

        connection.collect()
        collect.assert_called_with(uconn)
        assert connection._transport is None

    def test_uri_passthrough(self):
        transport = Mock(name='transport')
        with patch('kombu.connection.get_transport_cls') as gtc:
            gtc.return_value = transport
            transport.can_parse_url = True
            with patch('kombu.connection.parse_url') as parse_url:
                c = Connection('foo+mysql://some_host')
                assert c.transport_cls == 'foo'
                parse_url.assert_not_called()
                assert c.hostname == 'mysql://some_host'
                assert c.as_uri().startswith('foo+')
            with patch('kombu.connection.parse_url') as parse_url:
                c = Connection('mysql://some_host', transport='foo')
                assert c.transport_cls == 'foo'
                parse_url.assert_not_called()
                assert c.hostname == 'mysql://some_host'
        c = Connection('pyamqp+sqlite://some_host')
        assert c.as_uri().startswith('pyamqp+')

    def test_ensure_connection_on_error(self):
        c = Connection('amqp://A;amqp://B')
        with patch('kombu.connection.retry_over_time') as rot:
            c.ensure_connection()
            rot.assert_called()

            args = rot.call_args[0]
            cb = args[4]
            intervals = iter([1, 2, 3, 4, 5])
            assert cb(KeyError(), intervals, 0) == 0
            assert cb(KeyError(), intervals, 1) == 1
            assert cb(KeyError(), intervals, 2) == 0
            assert cb(KeyError(), intervals, 3) == 2
            assert cb(KeyError(), intervals, 4) == 0
            assert cb(KeyError(), intervals, 5) == 3
            assert cb(KeyError(), intervals, 6) == 0
            assert cb(KeyError(), intervals, 7) == 4

            errback = Mock()
            c.ensure_connection(errback=errback)
            args = rot.call_args[0]
            cb = args[4]
            assert cb(KeyError(), intervals, 0) == 0
            errback.assert_called()

    def test_supports_heartbeats(self):
        c = Connection(transport=Mock)
        c.transport.implements.heartbeats = False
        assert not c.supports_heartbeats

    def test_is_evented(self):
        c = Connection(transport=Mock)
        c.transport.implements.asynchronous = False
        assert not c.is_evented

    def test_register_with_event_loop(self):
        transport = Mock(name='transport')
        transport.connection_errors = []
        c = Connection(transport=transport)
        loop = Mock(name='loop')
        c.register_with_event_loop(loop)
        c.transport.register_with_event_loop.assert_called_with(
            c.connection, loop,
        )

    def test_manager(self):
        c = Connection(transport=Mock)
        assert c.manager is c.transport.manager

    def test_copy(self):
        c = Connection('amqp://example.com')
        assert copy(c).info() == c.info()

    def test_copy_multiples(self):
        c = Connection('amqp://A.example.com;amqp://B.example.com')
        assert c.alt
        d = copy(c)
        assert d.alt == c.alt

    def test_switch(self):
        c = Connection('amqp://foo')
        c._closed = True
        c.switch('redis://example.com//3')
        assert not c._closed
        assert c.hostname == 'example.com'
        assert c.transport_cls == 'redis'
        assert c.virtual_host == '/3'

    def test_maybe_switch_next(self):
        c = Connection('amqp://foo;redis://example.com//3')
        c.maybe_switch_next()
        assert not c._closed
        assert c.hostname == 'example.com'
        assert c.transport_cls == 'redis'
        assert c.virtual_host == '/3'

    def test_maybe_switch_next_no_cycle(self):
        c = Connection('amqp://foo')
        c.maybe_switch_next()
        assert not c._closed
        assert c.hostname == 'foo'
        assert c.transport_cls, ('librabbitmq', 'pyamqp' in 'amqp')

    def test_switch_without_uri_identifier(self):
        c = Connection('amqp://foo')
        assert c.hostname == 'foo'
        assert c.transport_cls, ('librabbitmq', 'pyamqp' in 'amqp')
        c._closed = True
        c.switch('example.com')
        assert not c._closed
        assert c.hostname == 'example.com'
        assert c.transport_cls, ('librabbitmq', 'pyamqp' in 'amqp')

    def test_heartbeat_check(self):
        c = Connection(transport=Transport)
        c.transport.heartbeat_check = Mock()
        c.heartbeat_check(3)
        c.transport.heartbeat_check.assert_called_with(c.connection, rate=3)

    def test_completes_cycle_no_cycle(self):
        c = Connection('amqp://')
        assert c.completes_cycle(0)
        assert c.completes_cycle(1)

    def test_completes_cycle(self):
        c = Connection('amqp://a;amqp://b;amqp://c')
        assert not c.completes_cycle(0)
        assert not c.completes_cycle(1)
        assert c.completes_cycle(2)

    def test_get_heartbeat_interval(self):
        self.conn.transport.get_heartbeat_interval = Mock(name='ghi')
        assert (self.conn.get_heartbeat_interval() is
                self.conn.transport.get_heartbeat_interval.return_value)
        self.conn.transport.get_heartbeat_interval.assert_called_with(
            self.conn.connection)

    def test_supports_exchange_type(self):
        self.conn.transport.implements.exchange_type = {'topic'}
        assert self.conn.supports_exchange_type('topic')
        assert not self.conn.supports_exchange_type('fanout')

    def test_qos_semantics_matches_spec(self):
        qsms = self.conn.transport.qos_semantics_matches_spec = Mock()
        assert self.conn.qos_semantics_matches_spec is qsms.return_value
        qsms.assert_called_with(self.conn.connection)

    def test__enter____exit__(self):
        with self.conn as context:
            assert context is self.conn
            self.conn.connect()
            assert self.conn.connection.connected
        assert self.conn.connection is None
        self.conn.close()    # again

    def test_close_survives_connerror(self):

        class _CustomError(Exception):
            pass

        class MyTransport(Transport):
            connection_errors = (_CustomError,)

            def close_connection(self, connection):
                raise _CustomError('foo')

        conn = Connection(transport=MyTransport)
        conn.connect()
        conn.close()
        assert conn._closed

    def test_close_when_default_channel(self):
        conn = self.conn
        conn._default_channel = Mock()
        conn._close()
        conn._default_channel.close.assert_called_with()

    def test_auto_reconnect_default_channel(self):
        # tests GH issue: #1208
        # Tests that default_channel automatically reconnects when connection
        # closed
        c = Connection('memory://')
        c._closed = True
        with patch.object(
            c, '_connection_factory', side_effect=c._connection_factory
        ) as cf_mock:
            c.default_channel
            cf_mock.assert_called_once_with()

    def test_close_when_default_channel_close_raises(self):

        class Conn(Connection):

            @property
            def connection_errors(self):
                return (KeyError,)

        conn = Conn('memory://')
        conn._default_channel = Mock()
        conn._default_channel.close.side_effect = KeyError()

        conn._close()
        conn._default_channel.close.assert_called_with()

    def test_revive_when_default_channel(self):
        conn = self.conn
        defchan = conn._default_channel = Mock()
        conn.revive(Mock())

        defchan.close.assert_called_with()
        assert conn._default_channel is None

    def test_ensure_connection(self):
        assert self.conn.ensure_connection()

    def test_ensure_success(self):
        def publish():
            return 'foobar'

        ensured = self.conn.ensure(None, publish)
        assert ensured() == 'foobar'

    def test_ensure_failure(self):
        class _CustomError(Exception):
            pass

        def publish():
            raise _CustomError('bar')

        ensured = self.conn.ensure(None, publish)
        with pytest.raises(_CustomError):
            ensured()

    def test_ensure_connection_failure(self):
        class _ConnectionError(Exception):
            pass

        def publish():
            raise _ConnectionError('failed connection')

        self.conn.get_transport_cls().connection_errors = (_ConnectionError,)
        ensured = self.conn.ensure(self.conn, publish)
        with pytest.raises(OperationalError):
            ensured()

    def test_ensure_retry_errors_is_limited_by_max_retries(self):
        class _MessageNacked(Exception):
            pass

        tries = 0

        def publish():
            nonlocal tries
            tries += 1
            if tries <= 3:
                raise _MessageNacked('NACK')
            # On the 4th try, we let it pass
            return 'ACK'

        ensured = self.conn.ensure(
            self.conn,
            publish,
            max_retries=3,  # 3 retries + 1 initial try = 4 tries
            retry_errors=(_MessageNacked,)
        )

        assert ensured() == 'ACK'

    def test_autoretry(self):
        myfun = Mock()

        self.conn.get_transport_cls().connection_errors = (KeyError,)

        def on_call(*args, **kwargs):
            myfun.side_effect = None
            raise KeyError('foo')

        myfun.side_effect = on_call
        insured = self.conn.autoretry(myfun)
        insured()

        myfun.assert_called()

    def test_SimpleQueue(self):
        conn = self.conn
        q = conn.SimpleQueue('foo')
        assert q.channel is conn.default_channel
        chan = conn.channel()
        q2 = conn.SimpleQueue('foo', channel=chan)
        assert q2.channel is chan

    def test_SimpleBuffer(self):
        conn = self.conn
        q = conn.SimpleBuffer('foo')
        assert q.channel is conn.default_channel
        chan = conn.channel()
        q2 = conn.SimpleBuffer('foo', channel=chan)
        assert q2.channel is chan

    def test_SimpleQueue_with_parameters(self):
        conn = self.conn
        q = conn.SimpleQueue(
            'foo', True, {'durable': True}, {'x-queue-mode': 'lazy'},
            {'durable': True, 'type': 'fanout', 'delivery_mode': 'persistent'})

        assert q.queue.exchange.type == 'fanout'
        assert q.queue.exchange.durable
        assert not q.queue.exchange.auto_delete
        delivery_mode_code = q.queue.exchange.PERSISTENT_DELIVERY_MODE
        assert q.queue.exchange.delivery_mode == delivery_mode_code

        assert q.queue.queue_arguments['x-queue-mode'] == 'lazy'

        assert q.queue.durable
        assert not q.queue.auto_delete

    def test_SimpleBuffer_with_parameters(self):
        conn = self.conn
        q = conn.SimpleBuffer(
            'foo', True, {'durable': True}, {'x-queue-mode': 'lazy'},
            {'durable': True, 'type': 'fanout', 'delivery_mode': 'persistent'})
        assert q.queue.exchange.type == 'fanout'
        assert q.queue.exchange.durable
        assert q.queue.exchange.auto_delete
        delivery_mode_code = q.queue.exchange.PERSISTENT_DELIVERY_MODE
        assert q.queue.exchange.delivery_mode == delivery_mode_code
        assert q.queue.queue_arguments['x-queue-mode'] == 'lazy'
        assert q.queue.durable
        assert q.queue.auto_delete

    def test_Producer(self):
        conn = self.conn
        assert isinstance(conn.Producer(), Producer)
        assert isinstance(conn.Producer(conn.default_channel), Producer)

    def test_Consumer(self):
        conn = self.conn
        assert isinstance(conn.Consumer(queues=[]), Consumer)
        assert isinstance(
            conn.Consumer(queues=[], channel=conn.default_channel),
            Consumer)

    def test__repr__(self):
        assert repr(self.conn)

    def test__reduce__(self):
        x = pickle.loads(pickle.dumps(self.conn))
        assert x.info() == self.conn.info()

    def test_channel_errors(self):

        class MyTransport(Transport):
            channel_errors = (KeyError, ValueError)

        conn = Connection(transport=MyTransport)
        assert conn.channel_errors == (KeyError, ValueError)

    def test_channel_errors__exception_no_cache(self):
        """Ensure the channel_errors can be retrieved without an initialized
        transport.
        """

        class MyTransport(Transport):
            channel_errors = (KeyError,)

        conn = Connection(transport=MyTransport)
        MyTransport.__init__ = Mock(side_effect=Exception)
        assert conn.channel_errors == (KeyError,)

    def test_connection_errors(self):

        class MyTransport(Transport):
            connection_errors = (KeyError, ValueError)

        conn = Connection(transport=MyTransport)
        assert conn.connection_errors == (KeyError, ValueError)

    def test_connection_errors__exception_no_cache(self):
        """Ensure the connection_errors can be retrieved without an
        initialized transport.
        """

        class MyTransport(Transport):
            connection_errors = (KeyError,)

        conn = Connection(transport=MyTransport)
        MyTransport.__init__ = Mock(side_effect=Exception)
        assert conn.connection_errors == (KeyError,)

    def test_recoverable_connection_errors(self):

        class MyTransport(Transport):
            recoverable_connection_errors = (KeyError, ValueError)

        conn = Connection(transport=MyTransport)
        assert conn.recoverable_connection_errors == (KeyError, ValueError)

    def test_recoverable_connection_errors__fallback(self):
        """Ensure missing recoverable_connection_errors on the Transport does
        not cause a fatal error.
        """

        class MyTransport(Transport):
            connection_errors = (KeyError,)
            channel_errors = (ValueError,)

        conn = Connection(transport=MyTransport)
        assert conn.recoverable_connection_errors == (KeyError, ValueError)

    def test_recoverable_connection_errors__exception_no_cache(self):
        """Ensure the recoverable_connection_errors can be retrieved without
        an initialized transport.
        """

        class MyTransport(Transport):
            recoverable_connection_errors = (KeyError,)

        conn = Connection(transport=MyTransport)
        MyTransport.__init__ = Mock(side_effect=Exception)
        assert conn.recoverable_connection_errors == (KeyError,)

    def test_recoverable_channel_errors(self):

        class MyTransport(Transport):
            recoverable_channel_errors = (KeyError, ValueError)

        conn = Connection(transport=MyTransport)
        assert conn.recoverable_channel_errors == (KeyError, ValueError)

    def test_recoverable_channel_errors__fallback(self):
        """Ensure missing recoverable_channel_errors on the Transport does not
        cause a fatal error.
        """

        class MyTransport(Transport):
            pass

        conn = Connection(transport=MyTransport)
        assert conn.recoverable_channel_errors == ()

    def test_recoverable_channel_errors__exception_no_cache(self):
        """Ensure the recoverable_channel_errors can be retrieved without an
        initialized transport.
        """
        class MyTransport(Transport):
            recoverable_channel_errors = (KeyError,)

        conn = Connection(transport=MyTransport)
        MyTransport.__init__ = Mock(side_effect=Exception)
        assert conn.recoverable_channel_errors == (KeyError,)

    def test_multiple_urls_hostname(self):
        conn = Connection(['example.com;amqp://example.com'])
        assert conn.as_uri() == 'amqp://guest:**@example.com:5672//'
        conn = Connection(['example.com', 'amqp://example.com'])
        assert conn.as_uri() == 'amqp://guest:**@example.com:5672//'
        conn = Connection('example.com;example.com;')
        assert conn.as_uri() == 'amqp://guest:**@example.com:5672//'

    def test_connection_respect_its_timeout(self):
        invalid_port = 1222
        with Connection(
            f'amqp://guest:guest@localhost:{invalid_port}//',
            transport_options={'max_retries': 2},
            connect_timeout=1
        ) as conn:
            with pytest.raises(OperationalError):
                conn.default_channel

    def test_connection_failover_without_total_timeout(self):
        with Connection(
            ['server1', 'server2'],
            transport=TimeoutingTransport,
            connect_timeout=1,
            transport_options={'interval_start': 0, 'interval_step': 0},
        ) as conn:
            conn._establish_connection = Mock(
                side_effect=conn._establish_connection
            )
            with pytest.raises(OperationalError):
                conn.default_channel
            # Never retried, because `retry_over_time` `timeout` is equal
            # to `connect_timeout`
            conn._establish_connection.assert_called_once()

    def test_connection_failover_with_total_timeout(self):
        with Connection(
            ['server1', 'server2'],
            transport=TimeoutingTransport,
            connect_timeout=1,
            transport_options={'connect_retries_timeout': 2,
                               'interval_start': 0, 'interval_step': 0},
        ) as conn:
            conn._establish_connection = Mock(
                side_effect=conn._establish_connection
            )
            with pytest.raises(OperationalError):
                conn.default_channel
            assert conn._establish_connection.call_count == 2


class test_Connection_with_transport_options:

    transport_options = {'pool_recycler': 3600, 'echo': True}

    def setup_method(self):
        self.conn = Connection(port=5672, transport=Transport,
                               transport_options=self.transport_options)

    def test_establish_connection(self):
        conn = self.conn
        assert conn.transport_options == self.transport_options


class xResource(Resource):

    def setup(self):
        pass


class ResourceCase:

    def create_resource(self, limit):
        raise NotImplementedError('subclass responsibility')

    def assert_state(self, P, avail, dirty):
        assert P._resource.qsize() == avail
        assert len(P._dirty) == dirty

    def test_setup(self):
        with pytest.raises(NotImplementedError):
            Resource()

    def test_acquire__release(self):
        P = self.create_resource(10)
        self.assert_state(P, 10, 0)
        chans = [P.acquire() for _ in range(10)]
        self.assert_state(P, 0, 10)
        with pytest.raises(P.LimitExceeded):
            P.acquire()
        chans.pop().release()
        self.assert_state(P, 1, 9)
        [chan.release() for chan in chans]
        self.assert_state(P, 10, 0)

    def test_acquire_prepare_raises(self):
        P = self.create_resource(10)

        assert len(P._resource.queue) == 10
        P.prepare = Mock()
        P.prepare.side_effect = IOError()
        with pytest.raises(IOError):
            P.acquire(block=True)
        assert len(P._resource.queue) == 10

    def test_acquire_no_limit(self):
        P = self.create_resource(None)
        P.acquire().release()

    def test_acquire_resize_in_use(self):
        P = self.create_resource(5)
        self.assert_state(P, 5, 0)
        chans = [P.acquire() for _ in range(5)]
        self.assert_state(P, 0, 5)
        with pytest.raises(RuntimeError):
            P.resize(4)
        [chan.release() for chan in chans]
        self.assert_state(P, 5, 0)

    def test_acquire_resize_ignore_err_no_shrink(self):
        P = self.create_resource(5)
        self.assert_state(P, 5, 0)
        chans = [P.acquire() for _ in range(5)]
        self.assert_state(P, 0, 5)
        P.resize(4, ignore_errors=True)
        self.assert_state(P, 0, 5)
        [chan.release() for chan in chans]
        self.assert_state(P, 5, 0)

    def test_acquire_resize_ignore_err_shrink(self):
        P = self.create_resource(5)
        self.assert_state(P, 5, 0)
        chans = [P.acquire() for _ in range(4)]
        self.assert_state(P, 1, 4)
        P.resize(4, ignore_errors=True)
        self.assert_state(P, 0, 4)
        [chan.release() for chan in chans]
        self.assert_state(P, 4, 0)

    def test_acquire_resize_larger(self):
        P = self.create_resource(1)
        self.assert_state(P, 1, 0)
        c1 = P.acquire()
        self.assert_state(P, 0, 1)
        with pytest.raises(P.LimitExceeded):
            P.acquire()
        P.resize(2)
        self.assert_state(P, 1, 1)
        c2 = P.acquire()
        self.assert_state(P, 0, 2)
        c1.release()
        c2.release()
        self.assert_state(P, 2, 0)

    def test_acquire_resize_force_smaller(self):
        P = self.create_resource(2)
        self.assert_state(P, 2, 0)
        c1 = P.acquire()
        c2 = P.acquire()
        self.assert_state(P, 0, 2)
        with pytest.raises(P.LimitExceeded):
            P.acquire()
        P.resize(1, force=True)     # acts like reset
        del c1
        del c2
        self.assert_state(P, 1, 0)
        c1 = P.acquire()
        self.assert_state(P, 0, 1)
        with pytest.raises(P.LimitExceeded):
            P.acquire()
        c1.release()
        self.assert_state(P, 1, 0)

    def test_acquire_resize_reset(self):
        P = self.create_resource(2)
        self.assert_state(P, 2, 0)
        c1 = P.acquire()
        c2 = P.acquire()
        self.assert_state(P, 0, 2)
        with pytest.raises(P.LimitExceeded):
            P.acquire()
        P.resize(3, reset=True)
        del c1
        del c2
        self.assert_state(P, 3, 0)
        c1 = P.acquire()
        c2 = P.acquire()
        c3 = P.acquire()
        self.assert_state(P, 0, 3)
        with pytest.raises(P.LimitExceeded):
            P.acquire()
        c1.release()
        c2.release()
        c3.release()
        self.assert_state(P, 3, 0)

    def test_replace_when_limit(self):
        P = self.create_resource(10)
        r = P.acquire()
        P._dirty = Mock()
        P.close_resource = Mock()

        P.replace(r)
        P._dirty.discard.assert_called_with(r)
        P.close_resource.assert_called_with(r)

    def test_replace_no_limit(self):
        P = self.create_resource(None)
        r = P.acquire()
        P._dirty = Mock()
        P.close_resource = Mock()

        P.replace(r)
        P._dirty.discard.assert_not_called()
        P.close_resource.assert_called_with(r)

    def test_interface_prepare(self):
        x = xResource()
        assert x.prepare(10) == 10

    def test_force_close_all_handles_AttributeError(self):
        P = self.create_resource(10)
        cr = P.collect_resource = Mock()
        cr.side_effect = AttributeError('x')

        P.acquire()
        assert P._dirty

        P.force_close_all()

    def test_force_close_all_no_mutex(self):
        P = self.create_resource(10)
        P.close_resource = Mock()

        m = P._resource = Mock()
        m.mutex = None
        m.queue.pop.side_effect = IndexError

        P.force_close_all()

    def test_add_when_empty(self):
        P = self.create_resource(None)
        P._resource.queue.clear()
        assert not P._resource.queue
        P._add_when_empty()
        assert P._resource.queue


class test_ConnectionPool(ResourceCase):

    def create_resource(self, limit):
        return Connection(port=5672, transport=Transport).Pool(limit)

    def test_collect_resource__does_not_collect_lazy_resource(self):
        P = self.create_resource(10)
        res = lazy(object())
        res.collect = Mock(name='collect')
        P.collect_resource(res)
        res.collect.assert_not_called()

    def test_collect_resource(self):
        res = Mock(name='res')
        P = self.create_resource(10)
        P.collect_resource(res, socket_timeout=10.3)
        res.collect.assert_called_with(10.3)

    def test_setup(self):
        P = self.create_resource(10)
        q = P._resource.queue
        assert q[0]()._connection is None
        assert q[1]()._connection is None
        assert q[2]()._connection is None

    def test_acquire_raises_evaluated(self):
        P = self.create_resource(1)
        # evaluate the connection first
        r = P.acquire()
        r.release()
        P.prepare = Mock()
        P.prepare.side_effect = MemoryError()
        P.release = Mock()
        with pytest.raises(MemoryError):
            with P.acquire():
                assert False
        P.release.assert_called_with(r)

    def test_release_no__debug(self):
        P = self.create_resource(10)
        R = Mock()
        R._debug.side_effect = AttributeError()
        P.release_resource(R)

    def test_setup_no_limit(self):
        P = self.create_resource(None)
        assert not P._resource.queue
        assert P.limit is None

    def test_prepare_not_callable(self):
        P = self.create_resource(None)
        conn = Connection('memory://')
        assert P.prepare(conn) is conn

    def test_acquire_channel(self):
        P = self.create_resource(10)
        with P.acquire_channel() as (conn, channel):
            assert channel is conn.default_channel


class test_ChannelPool(ResourceCase):

    def create_resource(self, limit):
        return Connection(port=5672, transport=Transport).ChannelPool(limit)

    def test_setup(self):
        P = self.create_resource(10)
        q = P._resource.queue
        with pytest.raises(AttributeError):
            q[0].basic_consume

    def test_setup_no_limit(self):
        P = self.create_resource(None)
        assert not P._resource.queue
        assert P.limit is None

    def test_prepare_not_callable(self):
        P = self.create_resource(10)
        conn = Connection('memory://')
        chan = conn.default_channel
        assert P.prepare(chan) is chan
