Use stream module to call exec/attach calls

Author: mbohlool

CHANGELOG.md

@@ -1,3 +1,6 @@
+# Master
+- Adding stream package to support calls like exec. The old way of calling them is deprecated. See [Troubleshooting](README.md#why-execattach-calls-doesnt-work)).
+
 # v3.0.0
 - Fix Operation names for subresources kubernetes/kubernetes#49357
 

README.md

@@ -160,3 +160,7 @@ You'll need a version with OpenSSL version 1.0.0 or later.
 If you get an `ssl.CertificateError` complaining about hostname match, your installed packages does not meet version [requirements](requirements.txt). 
 Specifically check `ipaddress` and `urllib3` package versions to make sure they met requirements in [requirements.txt](requirements.txt) file.
 
+### Why Exec/Attach calls doesn't work
+Starting from 4.0 release, we do not support directly calling exec or attach calls. you should use stream module to call them. so instead
+of `resp = api.connect_get_namespaced_pod_exec(name, ...` you should call `resp = stream(api.connect_get_namespaced_pod_exec, name, ...`.
+See more at [exec example](examples/exec.py).

examples/exec.py

@@ -4,6 +4,7 @@
 from kubernetes.client import configuration
 from kubernetes.client.apis import core_v1_api
 from kubernetes.client.rest import ApiException
+from kubernetes.stream import stream
 
 config.load_kube_config()
 configuration.assert_hostname = False
@@ -55,20 +56,19 @@
     '/bin/sh',
     '-c',
     'echo This message goes to stderr >&2; echo This message goes to stdout']
-resp = api.connect_get_namespaced_pod_exec(name, 'default',
-                                           command=exec_command,
-                                           stderr=True, stdin=False,
-                                           stdout=True, tty=False)
+resp = stream(api.connect_get_namespaced_pod_exec, name, 'default',
+              command=exec_command,
+              stderr=True, stdin=False,
+              stdout=True, tty=False)
 print("Response: " + resp)
 
 # Calling exec interactively.
 exec_command = ['/bin/sh']
-resp = api.connect_get_namespaced_pod_exec(name, 'default',
-                                           command=exec_command,
-                                           stderr=True, stdin=True,
-                                           stdout=True, tty=False,
-
-                                           _preload_content=False)
+resp = stream(api.connect_get_namespaced_pod_exec, name, 'default',
+              command=exec_command,
+              stderr=True, stdin=True,
+              stdout=True, tty=False,
+              _preload_content=False)
 commands = [
     "echo test1",
     "echo \"This message goes to stderr\" >&2",

kubernetes/__init__.py

@@ -19,3 +19,4 @@
 import kubernetes.client
 import kubernetes.config
 import kubernetes.watch
+import kubernetes.stream

kubernetes/e2e_test/test_client.py

@@ -20,6 +20,7 @@
 from kubernetes.client import api_client
 from kubernetes.client.apis import core_v1_api
 from kubernetes.e2e_test import base
+from kubernetes.stream import stream
 
 
 def short_uuid():
@@ -74,22 +75,22 @@ def test_pod_apis(self):
         exec_command = ['/bin/sh',
                         '-c',
                         'for i in $(seq 1 3); do date; done']
-        resp = api.connect_get_namespaced_pod_exec(name, 'default',
+        resp = stream(api.connect_get_namespaced_pod_exec, name, 'default',
                                                    command=exec_command,
                                                    stderr=False, stdin=False,
                                                    stdout=True, tty=False)
         print('EXEC response : %s' % resp)
         self.assertEqual(3, len(resp.splitlines()))
 
         exec_command = 'uptime'
-        resp = api.connect_post_namespaced_pod_exec(name, 'default',
+        resp = stream(api.connect_post_namespaced_pod_exec, name, 'default',
                                                     command=exec_command,
                                                     stderr=False, stdin=False,
                                                     stdout=True, tty=False)
         print('EXEC response : %s' % resp)
         self.assertEqual(1, len(resp.splitlines()))
 
-        resp = api.connect_post_namespaced_pod_exec(name, 'default',
+        resp = stream(api.connect_post_namespaced_pod_exec, name, 'default',
                                                     command='/bin/sh',
                                                     stderr=True, stdin=True,
                                                     stdout=True, tty=False,

kubernetes/stream

@@ -0,0 +1 @@
+base/stream