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Unittests and example for portforwarding ability added in python-base.
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# Copyright 2020 The Kubernetes Authors. | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
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""" | ||
Shows the functionality of portforward streaming using an nginx container. | ||
""" | ||
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import socket | ||
import time | ||
import urllib.request | ||
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from kubernetes import config | ||
from kubernetes.client import Configuration | ||
from kubernetes.client.api import core_v1_api | ||
from kubernetes.client.rest import ApiException | ||
from kubernetes.stream import portforward | ||
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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) | ||
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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', | ||
}] | ||
} | ||
} | ||
resp = 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.") | ||
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pf = portforward(api_instance.connect_get_namespaced_pod_portforward, | ||
name, 'default', | ||
ports='80') | ||
http = pf.socket(80) | ||
http.settimeout(1) | ||
http.sendall(b'GET / HTTP/1.1\r\n') | ||
http.sendall(b'Host: 127.0.0.1\r\n') | ||
http.sendall(b'Accept: */*\r\n') | ||
http.sendall(b'\r\n') | ||
response = b'' | ||
while True: | ||
try: | ||
response += http.recv(1024) | ||
except socket.timeout: | ||
break | ||
print(response.decode('utf-8')) | ||
http.close() | ||
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# 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. | ||
def kubernetes_create_connection(address, *args, **kwargs): | ||
dns_name = address[0] | ||
if isinstance(dns_name, bytes): | ||
dns_name = dns_name.decode() | ||
# Look for "<pod-name>.<namspace>.kubernetes" dns names and if found | ||
# provide a socket that is port forwarded to the kuberntest pod. | ||
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_instance.connect_get_namespaced_pod_portforward, | ||
dns_name[0], dns_name[1], ports=str(address[1])) | ||
return pf.socket(address[1]) | ||
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socket_create_connection = socket.create_connection | ||
socket.create_connection = kubernetes_create_connection | ||
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# Access the nginx http server using the "<pod-name>.<namespace>.kubernetes" dns name. | ||
response = urllib.request.urlopen('http://%s.default.kubernetes' % name) | ||
html = response.read().decode('utf-8') | ||
response.close() | ||
print('Status:', response.status) | ||
print(html) | ||
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def main(): | ||
config.load_kube_config() | ||
c = Configuration() | ||
c.assert_hostname = False | ||
Configuration.set_default(c) | ||
core_v1 = core_v1_api.CoreV1Api() | ||
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portforward_commands(core_v1) | ||
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if __name__ == '__main__': | ||
main() |
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