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import os
import pytest
import socket
import subprocess
import time
socket.setdefaulttimeout(5)
class ClientPool:
"""hands out Client instances and tears them down"""
def __init__(self):
self.local_ports = set()
self.clients = set()
def get(self, count):
ret = []
for i in range(1, count + 1):
try:
local_port = self.local_ports.pop()
except KeyError:
local_port = 0
client = Client(str(i), local_port)
ret.append(client)
self.clients.add(client)
if count == 1:
return ret[0]
else:
return ret
def teardown(self):
for client in self.clients:
port = client.close()
if port:
# Recycle!
self.local_ports.add(port)
self.clients.clear()
class Client:
"""Wrapper around socket"""
host = '127.0.0.1'
port = 7531
def __init__(self, name, local_port=0):
self.name = name
self.local_port = local_port
self._socket = None
@property
def socket(self):
if self._socket is None:
tries = 5
connected = False
while not connected:
self._socket = socket.socket()
# TODO: is the getaddrinfo indirection necessary?
remote = socket.getaddrinfo(self.host, self.port)
local = socket.getaddrinfo(self.host, self.local_port)
self._socket.setsockopt(
socket.SOL_SOCKET, socket.SO_REUSEADDR, 1
)
try:
# We try and reuse the local port if we can. The only
# way to do that is is to bind on 0, copy the ephemeral
# port we're given, and then rebind on that the next
# time we open the socket.
self._socket.bind(local[0][4])
self._socket.connect(remote[0][4])
connected = True
except (ConnectionRefusedError, OSError):
tries -= 1
if tries <= 0:
raise
# Wait for poolcounter to start?
time.sleep(2)
# else try again!
return self._socket
def send(self, command):
print('%s -> ' % self.name + command)
self.socket.send(command.encode() + b'\n')
def receive(self):
recv = self.socket.recv(4096).strip().decode()
print('%s <- ' % self.name + recv)
return recv
def close(self):
if self._socket:
# Save the local_port for next time
self.local_port = self._socket.getsockname()[1]
# TODO: If _socket isn't connected, trying to shut
# it down will error again
self._socket.shutdown(socket.SHUT_RDWR)
self._socket.close()
self._socket = None
return self.local_port
def find_poolcounterd():
# env POOLCOUNTERD can point to the binary if you want to run tests
# against an installed version
path = os.environ.get(
'POOLCOUNTERD',
os.path.join(os.path.dirname(os.path.dirname(__file__)), 'poolcounterd')
)
if not os.path.exists(path):
pytest.skip('%s does not exist' % path)
return path
@pytest.fixture(scope='session')
def poolcounter():
path = find_poolcounterd()
daemon = subprocess.Popen([path])
yield daemon
daemon.terminate()
@pytest.fixture()
def poolcounter_path():
return find_poolcounterd()
# Use a singleton ClientPool to keep local_ports global
pool = ClientPool()
@pytest.fixture()
def clients():
yield pool
pool.teardown()
def pytest_generate_tests(metafunc):
"""parameterize lock_type if it's listed"""
if 'lock_type' in metafunc.fixturenames:
metafunc.parametrize('lock_type', ['ACQ4ME', 'ACQ4ANY'])
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