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# pylint: skip-file
from __future__ import absolute_import
from errno import EALREADY, EINPROGRESS, EISCONN, ECONNRESET
import socket
import mock
import pytest
from kafka.conn import BrokerConnection, ConnectionStates, collect_hosts
from kafka.protocol.api import RequestHeader
from kafka.protocol.metadata import MetadataRequest
from kafka.protocol.produce import ProduceRequest
import kafka.errors as Errors
@pytest.fixture
def dns_lookup(mocker):
return mocker.patch('kafka.conn.dns_lookup',
return_value=[(socket.AF_INET,
None, None, None,
('localhost', 9092))])
@pytest.fixture
def _socket(mocker):
socket = mocker.MagicMock()
socket.connect_ex.return_value = 0
mocker.patch('socket.socket', return_value=socket)
return socket
@pytest.fixture
def conn(_socket, dns_lookup):
conn = BrokerConnection('localhost', 9092, socket.AF_INET)
return conn
@pytest.mark.parametrize("states", [
(([EINPROGRESS, EALREADY], ConnectionStates.CONNECTING),),
(([EALREADY, EALREADY], ConnectionStates.CONNECTING),),
(([0], ConnectionStates.CONNECTED),),
(([EINPROGRESS, EALREADY], ConnectionStates.CONNECTING),
([ECONNRESET], ConnectionStates.DISCONNECTED)),
(([EINPROGRESS, EALREADY], ConnectionStates.CONNECTING),
([EALREADY], ConnectionStates.CONNECTING),
([EISCONN], ConnectionStates.CONNECTED)),
])
def test_connect(_socket, conn, states):
assert conn.state is ConnectionStates.DISCONNECTED
for errno, state in states:
_socket.connect_ex.side_effect = errno
conn.connect()
assert conn.state is state
def test_connect_timeout(_socket, conn):
assert conn.state is ConnectionStates.DISCONNECTED
# Initial connect returns EINPROGRESS
# immediate inline connect returns EALREADY
# second explicit connect returns EALREADY
# third explicit connect returns EALREADY and times out via last_attempt
_socket.connect_ex.side_effect = [EINPROGRESS, EALREADY, EALREADY, EALREADY]
conn.connect()
assert conn.state is ConnectionStates.CONNECTING
conn.connect()
assert conn.state is ConnectionStates.CONNECTING
conn.last_attempt = 0
conn.connect()
assert conn.state is ConnectionStates.DISCONNECTED
def test_blacked_out(conn):
with mock.patch("time.time", return_value=1000):
conn.last_attempt = 0
assert conn.blacked_out() is False
conn.last_attempt = 1000
assert conn.blacked_out() is True
def test_connection_delay(conn):
with mock.patch("time.time", return_value=1000):
conn.last_attempt = 1000
assert conn.connection_delay() == conn.config['reconnect_backoff_ms']
conn.state = ConnectionStates.CONNECTING
assert conn.connection_delay() == float('inf')
conn.state = ConnectionStates.CONNECTED
assert conn.connection_delay() == float('inf')
def test_connected(conn):
assert conn.connected() is False
conn.state = ConnectionStates.CONNECTED
assert conn.connected() is True
def test_connecting(conn):
assert conn.connecting() is False
conn.state = ConnectionStates.CONNECTING
assert conn.connecting() is True
conn.state = ConnectionStates.CONNECTED
assert conn.connecting() is False
def test_send_disconnected(conn):
conn.state = ConnectionStates.DISCONNECTED
f = conn.send('foobar')
assert f.failed() is True
assert isinstance(f.exception, Errors.KafkaConnectionError)
def test_send_connecting(conn):
conn.state = ConnectionStates.CONNECTING
f = conn.send('foobar')
assert f.failed() is True
assert isinstance(f.exception, Errors.NodeNotReadyError)
def test_send_max_ifr(conn):
conn.state = ConnectionStates.CONNECTED
max_ifrs = conn.config['max_in_flight_requests_per_connection']
for i in range(max_ifrs):
conn.in_flight_requests[i] = 'foo'
f = conn.send('foobar')
assert f.failed() is True
assert isinstance(f.exception, Errors.TooManyInFlightRequests)
def test_send_no_response(_socket, conn):
conn.connect()
assert conn.state is ConnectionStates.CONNECTED
req = ProduceRequest[0](required_acks=0, timeout=0, topics=())
header = RequestHeader(req, client_id=conn.config['client_id'])
payload_bytes = len(header.encode()) + len(req.encode())
third = payload_bytes // 3
remainder = payload_bytes % 3
_socket.send.side_effect = [4, third, third, third, remainder]
assert len(conn.in_flight_requests) == 0
f = conn.send(req)
assert f.succeeded() is True
assert f.value is None
assert len(conn.in_flight_requests) == 0
def test_send_response(_socket, conn):
conn.connect()
assert conn.state is ConnectionStates.CONNECTED
req = MetadataRequest[0]([])
header = RequestHeader(req, client_id=conn.config['client_id'])
payload_bytes = len(header.encode()) + len(req.encode())
third = payload_bytes // 3
remainder = payload_bytes % 3
_socket.send.side_effect = [4, third, third, third, remainder]
assert len(conn.in_flight_requests) == 0
f = conn.send(req)
assert f.is_done is False
assert len(conn.in_flight_requests) == 1
def test_send_error(_socket, conn):
conn.connect()
assert conn.state is ConnectionStates.CONNECTED
req = MetadataRequest[0]([])
try:
_socket.send.side_effect = ConnectionError
except NameError:
_socket.send.side_effect = socket.error
f = conn.send(req)
assert f.failed() is True
assert isinstance(f.exception, Errors.KafkaConnectionError)
assert _socket.close.call_count == 1
assert conn.state is ConnectionStates.DISCONNECTED
def test_can_send_more(conn):
assert conn.can_send_more() is True
max_ifrs = conn.config['max_in_flight_requests_per_connection']
for i in range(max_ifrs):
assert conn.can_send_more() is True
conn.in_flight_requests[i] = 'foo'
assert conn.can_send_more() is False
def test_recv_disconnected(_socket, conn):
conn.connect()
assert conn.connected()
req = MetadataRequest[0]([])
header = RequestHeader(req, client_id=conn.config['client_id'])
payload_bytes = len(header.encode()) + len(req.encode())
_socket.send.side_effect = [4, payload_bytes]
conn.send(req)
# Empty data on recv means the socket is disconnected
_socket.recv.return_value = b''
# Attempt to receive should mark connection as disconnected
assert conn.connected()
conn.recv()
assert conn.disconnected()
def test_recv(_socket, conn):
pass # TODO
def test_close(conn):
pass # TODO
def test_collect_hosts__happy_path():
hosts = "127.0.0.1:1234,127.0.0.1"
results = collect_hosts(hosts)
assert set(results) == set([
('127.0.0.1', 1234, socket.AF_INET),
('127.0.0.1', 9092, socket.AF_INET),
])
def test_collect_hosts__ipv6():
hosts = "[localhost]:1234,[2001:1000:2000::1],[2001:1000:2000::1]:1234"
results = collect_hosts(hosts)
assert set(results) == set([
('localhost', 1234, socket.AF_INET6),
('2001:1000:2000::1', 9092, socket.AF_INET6),
('2001:1000:2000::1', 1234, socket.AF_INET6),
])
def test_collect_hosts__string_list():
hosts = [
'localhost:1234',
'localhost',
'[localhost]',
'2001::1',
'[2001::1]',
'[2001::1]:1234',
]
results = collect_hosts(hosts)
assert set(results) == set([
('localhost', 1234, socket.AF_UNSPEC),
('localhost', 9092, socket.AF_UNSPEC),
('localhost', 9092, socket.AF_INET6),
('2001::1', 9092, socket.AF_INET6),
('2001::1', 9092, socket.AF_INET6),
('2001::1', 1234, socket.AF_INET6),
])
def test_collect_hosts__with_spaces():
hosts = "localhost:1234, localhost"
results = collect_hosts(hosts)
assert set(results) == set([
('localhost', 1234, socket.AF_UNSPEC),
('localhost', 9092, socket.AF_UNSPEC),
])
def test_lookup_on_connect():
hostname = 'example.org'
port = 9092
conn = BrokerConnection(hostname, port, socket.AF_UNSPEC)
assert conn.host == hostname
assert conn.port == port
assert conn.afi == socket.AF_UNSPEC
afi1 = socket.AF_INET
sockaddr1 = ('127.0.0.1', 9092)
mock_return1 = [
(afi1, socket.SOCK_STREAM, 6, '', sockaddr1),
]
with mock.patch("socket.getaddrinfo", return_value=mock_return1) as m:
conn.connect()
m.assert_called_once_with(hostname, port, 0, socket.SOCK_STREAM)
assert conn._sock_afi == afi1
assert conn._sock_addr == sockaddr1
conn.close()
afi2 = socket.AF_INET6
sockaddr2 = ('::1', 9092, 0, 0)
mock_return2 = [
(afi2, socket.SOCK_STREAM, 6, '', sockaddr2),
]
with mock.patch("socket.getaddrinfo", return_value=mock_return2) as m:
conn.last_attempt = 0
conn.connect()
m.assert_called_once_with(hostname, port, 0, socket.SOCK_STREAM)
assert conn._sock_afi == afi2
assert conn._sock_addr == sockaddr2
conn.close()
def test_relookup_on_failure():
hostname = 'example.org'
port = 9092
conn = BrokerConnection(hostname, port, socket.AF_UNSPEC)
assert conn.host == hostname
mock_return1 = []
with mock.patch("socket.getaddrinfo", return_value=mock_return1) as m:
last_attempt = conn.last_attempt
conn.connect()
m.assert_called_once_with(hostname, port, 0, socket.SOCK_STREAM)
assert conn.disconnected()
assert conn.last_attempt > last_attempt
afi2 = socket.AF_INET
sockaddr2 = ('127.0.0.2', 9092)
mock_return2 = [
(afi2, socket.SOCK_STREAM, 6, '', sockaddr2),
]
with mock.patch("socket.getaddrinfo", return_value=mock_return2) as m:
conn.last_attempt = 0
conn.connect()
m.assert_called_once_with(hostname, port, 0, socket.SOCK_STREAM)
assert conn._sock_afi == afi2
assert conn._sock_addr == sockaddr2
conn.close()
def test_requests_timed_out(conn):
with mock.patch("time.time", return_value=0):
# No in-flight requests, not timed out
assert not conn.requests_timed_out()
# Single request, timestamp = now (0)
conn.in_flight_requests[0] = ('foo', 0)
assert not conn.requests_timed_out()
# Add another request w/ timestamp > request_timeout ago
request_timeout = conn.config['request_timeout_ms']
expired_timestamp = 0 - request_timeout - 1
conn.in_flight_requests[1] = ('bar', expired_timestamp)
assert conn.requests_timed_out()
# Drop the expired request and we should be good to go again
conn.in_flight_requests.pop(1)
assert not conn.requests_timed_out()
|
