def kubernetes_create_connection(address, *args, **kwargs):
dns_name = address[0]
if isinstance(dns_name, bytes):
dns_name = dns_name.decode()
dns_name = dns_name.split(".")
if len(dns_name) != 3 or dns_name[2] != "kubernetes":
return socket_create_connection(address, *args, **kwargs)
pf = portforward(api.connect_get_namespaced_pod_portforward,
dns_name[0],
dns_name[1],
ports=str(address[1]))
return pf.socket(address[1])
def kubernetes_create_connection(address, *args, **kwargs):
dns_name = address[0]
if isinstance(dns_name, bytes):
dns_name = dns_name.decode()
dns_name = dns_name.split(".")
if dns_name[-1] != 'kubernetes':
return socket_create_connection(address, *args, **kwargs)
if len(dns_name) not in (3, 4):
raise RuntimeError("Unexpected kubernetes DNS name.")
namespace = dns_name[-2]
name = dns_name[0]
port = address[1]
if len(dns_name) == 4:
if dns_name[1] in ('svc', 'service'):
service = api_instance.read_namespaced_service(name, namespace)
for service_port in service.spec.ports:
if service_port.port == port:
port = service_port.target_port
break
else:
raise RuntimeError("Unable to find service port: %s" %
port)
label_selector = []
for key, value in service.spec.selector.items():
label_selector.append("%s=%s" % (key, value))
pods = api_instance.list_namespaced_pod(
namespace, label_selector=",".join(label_selector))
if not pods.items:
raise RuntimeError("Unable to find service pods.")
name = pods.items[0].metadata.name
if isinstance(port, str):
for container in pods.items[0].spec.containers:
for container_port in container.ports:
if container_port.name == port:
port = container_port.container_port
break
else:
continue
break
else:
raise RuntimeError(
"Unable to find service port name: %s" % port)
elif dns_name[1] != 'pod':
raise RuntimeError("Unsupported resource type: %s" %
dns_name[1])
pf = portforward(api_instance.connect_get_namespaced_pod_portforward,
name,
namespace,
ports=str(port))
return pf.socket(port)
def connect(self):
corev1 = client.CoreV1Api(self.api_client)
service = corev1.read_namespaced_service(self.service, self.namespace)
label_selector = ','.join(k + '=' + v
for k, v in service.spec.selector.items())
pods = corev1.list_namespaced_pod(
namespace=self.namespace,
label_selector=label_selector,
)
self.port_forwarder = portforward(
corev1.connect_get_namespaced_pod_portforward,
pods.items[0].metadata.name,
self.namespace,
ports=str(self.remote_port),
)
def test_portforward_raw(self):
client = api_client.ApiClient(configuration=self.config)
api = core_v1_api.CoreV1Api(client)
with open(os.path.join(os.path.dirname(__file__),
'port_server.py')) as fh:
port_server_py = fh.read()
name = 'portforward-raw-' + short_uuid()
resp = api.create_namespaced_config_map(
body={
'apiVersion': 'v1',
'kind': 'ConfigMap',
'metadata': {
'name': name,
},
'data': {
'port-server.py': port_server_py,
}
},
namespace='default',
)
resp = api.create_namespaced_pod(
body={
'apiVersion': 'v1',
'kind': 'Pod',
'metadata': {
'name': name
},
'spec': {
'containers': [
{
'name':
'port-server',
'image':
'python',
'command': [
'/opt/port-server.py',
'1234',
'1235',
],
'volumeMounts': [
{
'name': 'port-server',
'mountPath': '/opt',
'readOnly': True,
},
],
'startupProbe': {
'tcpSocket': {
'port': 1234,
},
},
},
],
'volumes': [
{
'name': 'port-server',
'configMap': {
'name': name,
'defaultMode': 0o777,
},
},
],
},
},
namespace='default',
)
self.assertEqual(name, resp.metadata.name)
self.assertTrue(resp.status.phase)
while True:
resp = api.read_namespaced_pod(name=name, namespace='default')
self.assertEqual(name, resp.metadata.name)
self.assertTrue(resp.status.phase)
if resp.status.phase != 'Pending':
break
time.sleep(1)
self.assertEqual(resp.status.phase, 'Running')
pf = portforward(api.connect_get_namespaced_pod_portforward,
name,
'default',
ports='1234,1235,1236')
self.assertTrue(pf.connected)
sock1234 = pf.socket(1234)
sock1235 = pf.socket(1235)
sock1234.setblocking(True)
sock1235.setblocking(True)
sent1234 = b'Test port 1234 forwarding...'
sent1235 = b'Test port 1235 forwarding...'
sock1234.sendall(sent1234)
sock1235.sendall(sent1235)
reply1234 = b''
reply1235 = b''
while True:
rlist = []
if sock1234.fileno() != -1:
rlist.append(sock1234)
if sock1235.fileno() != -1:
rlist.append(sock1235)
if not rlist:
break
r, _w, _x = select.select(rlist, [], [], 1)
if not r:
break
if sock1234 in r:
data = sock1234.recv(1024)
self.assertNotEqual(data, b'', "Unexpected socket close")
reply1234 += data
if sock1235 in r:
data = sock1235.recv(1024)
self.assertNotEqual(data, b'', "Unexpected socket close")
reply1235 += data
self.assertEqual(reply1234, sent1234)
self.assertEqual(reply1235, sent1235)
self.assertTrue(pf.connected)
sock = pf.socket(1236)
self.assertRaises(socket.error, sock.sendall, b'This should fail...')
self.assertIsNotNone(pf.error(1236))
sock.close()
for sock in (sock1234, sock1235):
self.assertTrue(pf.connected)
sent = b'Another test using fileno %s' % str(
sock.fileno()).encode()
sock.sendall(sent)
reply = b''
while True:
r, _w, _x = select.select([sock], [], [], 1)
if not r:
break
data = sock.recv(1024)
self.assertNotEqual(data, b'', "Unexpected socket close")
reply += data
self.assertEqual(reply, sent)
sock.close()
time.sleep(1)
self.assertFalse(pf.connected)
self.assertIsNone(pf.error(1234))
self.assertIsNone(pf.error(1235))
resp = api.delete_namespaced_pod(name=name, namespace='default')
resp = api.delete_namespaced_config_map(name=name, namespace='default')
def portforward_commands(api_instance):
name = 'portforward-example'
resp = None
try:
resp = api_instance.read_namespaced_pod(name=name, namespace='default')
except ApiException as e:
if e.status != 404:
print("Unknown error: %s" % e)
exit(1)
if not resp:
print("Pod %s does not exist. Creating it..." % name)
pod_manifest = {
'apiVersion': 'v1',
'kind': 'Pod',
'metadata': {
'name': name
},
'spec': {
'containers': [{
'image': 'nginx',
'name': 'nginx',
}]
}
}
api_instance.create_namespaced_pod(body=pod_manifest,
namespace='default')
while True:
resp = api_instance.read_namespaced_pod(name=name,
namespace='default')
if resp.status.phase != 'Pending':
break
time.sleep(1)
print("Done.")
pf = portforward(
api_instance.connect_get_namespaced_pod_portforward,
name,
'default',
ports='80',
)
http = pf.socket(80)
http.setblocking(True)
http.sendall(b'GET / HTTP/1.1\r\n')
http.sendall(b'Host: 127.0.0.1\r\n')
http.sendall(b'Connection: close\r\n')
http.sendall(b'Accept: */*\r\n')
http.sendall(b'\r\n')
response = b''
while True:
select.select([http], [], [])
data = http.recv(1024)
if not data:
break
response += data
http.close()
print(response.decode('utf-8'))
error = pf.error(80)
if error is None:
print("No port forward errors on port 80.")
else:
print("Port 80 has the following error: %s" % error)
# Monkey patch socket.create_connection which is used by http.client and
# urllib.request. The same can be done with urllib3.util.connection.create_connection
# if the "requests" package is used.
socket_create_connection = socket.create_connection
def kubernetes_create_connection(address, *args, **kwargs):
dns_name = address[0]
if isinstance(dns_name, bytes):
dns_name = dns_name.decode()
dns_name = dns_name.split(".")
if dns_name[-1] != 'kubernetes':
return socket_create_connection(address, *args, **kwargs)
if len(dns_name) not in (3, 4):
raise RuntimeError("Unexpected kubernetes DNS name.")
namespace = dns_name[-2]
name = dns_name[0]
port = address[1]
if len(dns_name) == 4:
if dns_name[1] in ('svc', 'service'):
service = api_instance.read_namespaced_service(name, namespace)
for service_port in service.spec.ports:
if service_port.port == port:
port = service_port.target_port
break
else:
raise RuntimeError("Unable to find service port: %s" %
port)
label_selector = []
for key, value in service.spec.selector.items():
label_selector.append("%s=%s" % (key, value))
pods = api_instance.list_namespaced_pod(
namespace, label_selector=",".join(label_selector))
if not pods.items:
raise RuntimeError("Unable to find service pods.")
name = pods.items[0].metadata.name
if isinstance(port, str):
for container in pods.items[0].spec.containers:
for container_port in container.ports:
if container_port.name == port:
port = container_port.container_port
break
else:
continue
break
else:
raise RuntimeError(
"Unable to find service port name: %s" % port)
elif dns_name[1] != 'pod':
raise RuntimeError("Unsupported resource type: %s" %
dns_name[1])
pf = portforward(api_instance.connect_get_namespaced_pod_portforward,
name,
namespace,
ports=str(port))
return pf.socket(port)
socket.create_connection = kubernetes_create_connection
# Access the nginx http server using the
# "<pod-name>.pod.<namespace>.kubernetes" dns name.
response = urllib_request.urlopen('http://%s.pod.default.kubernetes' %
name)
html = response.read().decode('utf-8')
response.close()
print('Status Code: %s' % response.code)
print(html)
