Unittests and example for portforwarding ability added in python-base.

Author: iciclespider

examples/pod_portforward.py

@@ -0,0 +1,122 @@
+# 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.
+
+"""
+Shows the functionality of portforward streaming using an nginx container.
+"""
+
+import socket
+import time
+import urllib.request
+
+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
+
+
+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',
+                }]
+            }
+        }
+        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.")
+
+    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()
+
+    # 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])
+
+    socket_create_connection = socket.create_connection
+    socket.create_connection = kubernetes_create_connection
+
+    # 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)
+
+
+def main():
+    config.load_kube_config()
+    c = Configuration()
+    c.assert_hostname = False
+    Configuration.set_default(c)
+    core_v1 = core_v1_api.CoreV1Api()
+
+    portforward_commands(core_v1)
+
+
+if __name__ == '__main__':
+    main()

kubernetes/e2e_test/test_client.py

@@ -13,14 +13,16 @@
 # under the License.
 
 import json
+import socket
 import time
 import unittest
+import urllib.request
 import uuid
 
 from kubernetes.client import api_client
 from kubernetes.client.api import core_v1_api
 from kubernetes.e2e_test import base
-from kubernetes.stream import stream
+from kubernetes.stream import stream, portforward
 from kubernetes.stream.ws_client import ERROR_CHANNEL
 
 
@@ -119,6 +121,7 @@ def test_pod_apis(self):
 
         resp = api.delete_namespaced_pod(name=name, body={},
                                          namespace='default')
+
     def test_exit_code(self):
         client = api_client.ApiClient(configuration=self.config)
         api = core_v1_api.CoreV1Api(client)
@@ -159,6 +162,104 @@ def test_exit_code(self):
         resp = api.delete_namespaced_pod(name=name, body={},
                                          namespace='default')
 
+    def test_portforward_raw(self):
+        client = api_client.ApiClient(configuration=self.config)
+        api = core_v1_api.CoreV1Api(client)
+
+        name = 'portforward-raw-' + short_uuid()
+        pod_manifest = manifest_with_command(name, "while true;do nc -l -p 1234 -e /bin/cat; done")
+        resp = api.create_namespaced_pod(body=pod_manifest,
+                                         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)
+
+        pf = portforward(api.connect_get_namespaced_pod_portforward,
+                         name, 'default',
+                         ports='1234')
+        sock = pf.socket(1234)
+        sock.settimeout(1)
+        sent = b'Test port forwarding...'
+        sock.sendall(sent)
+        reply = b''
+        while True:
+            try:
+                reply += sock.recv(1024)
+            except socket.timeout:
+                break
+        self.assertEqual(sent, reply)
+        sock.close()
+        self.assertIsNone(pf.error(1234))
+
+        resp = api.delete_namespaced_pod(name=name, body={},
+                                         namespace='default')
+
+    def test_portforward_http(self):
+        client = api_client.ApiClient(configuration=self.config)
+        api = core_v1_api.CoreV1Api(client)
+
+        name = 'portforward-http-' +  short_uuid()
+        pod_manifest = {
+            'apiVersion': 'v1',
+            'kind': 'Pod',
+            'metadata': {
+                'name': name
+            },
+            'spec': {
+                'containers': [{
+                    'name': 'nginx',
+                    'image': 'nginx',
+                }]
+            }
+        }
+
+        resp = api.create_namespaced_pod(body=pod_manifest,
+                                         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)
+
+        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])
+
+        socket_create_connection = socket.create_connection
+        try:
+            socket.create_connection = kubernetes_create_connection
+            response = urllib.request.urlopen('http://%s.default.kubernetes/' % name)
+            html = response.read().decode('utf-8')
+        finally:
+            socket.create_connection = socket_create_connection
+
+        self.assertEqual(response.status, 200)
+        self.assertTrue('<h1>Welcome to nginx!</h1>' in html)
+
+        resp = api.delete_namespaced_pod(name=name, body={},
+                                         namespace='default')
+
     def test_service_apis(self):
         client = api_client.ApiClient(configuration=self.config)
         api = core_v1_api.CoreV1Api(client)