Support customizing “Accept” header #1428 #236

Yashks1994 · 2021-04-27T06:45:54Z

What this PR does / why we need it:

We are adding the new header parameter in the dynamic client which helps in scenarios where the user only cares about object metadata and wants to reduce the client-side deserialisation time.

This changes will accept the header like 'application/json;as=PartialObjectMetadata;v=v1;g=meta.k8s.io' or 'application/json;as=Table;v=v1;g=meta.k8s.io'.

Which issue(s) this PR fixes:

Fixes #1428

Special notes for your reviewer:

Added the metadata field which is currently present in client-go. Now this feature will also be supporting in the python-client.

Does this PR introduce a user-facing change?

The dynamic client now supports customizing http "Accept" header through the `header_params` parameter, which can be used to customizing API server response, e.g. retrieving object metadata only.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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dynamic/client.py

codecov-commenter · 2021-04-28T11:20:44Z

Codecov Report

Merging #236 (3c488d0) into master (8a969ee) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #236   +/-   ##
=======================================
  Coverage   92.73%   92.73%           
=======================================
  Files          13       13           
  Lines        1692     1692           
=======================================
  Hits         1569     1569           
  Misses        123      123

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roycaihw · 2021-04-28T17:01:41Z

dynamic/client.py

+            ])
+        if params.get('application/vnd.kubernetes.protobuf') is not None:
+            header_params['Accept'] = self.client.select_header_accept([
+            'application/vnd.kubernetes.protobuf',


the Python client doesn't understand protobuf. What we want is g=meta.k8s.io;v=v1,application/json;as=PartialObjectMetadata

that's right. it's also why it's good to have a test to verify it works as expected

Yashks1994 · 2021-04-30T09:24:04Z

Hi @roycaihw, @yliaog
In order to accept the header params = 'PartialObjectMetadata', I have added a condition which is described below:

First it is checking whether the header_params is not None. If it is not None then, next it will check if PartialObjectMetadata is present or not. Based on that it will set the header_params['Accept'] to params.
If the header_params is None or {} then it will set the header to default i.e.. application/json.

I have added test case which is accepting the params as 'PartialObjectMetadata' and it is checking whether the kind is equal to the params or not.

dynamic/client.py

yliaog · 2021-04-30T18:38:23Z

dynamic/client.py

-            'application/yaml',
-        ])
+        if params.get('header_params') is not None:
+            partial_object = params.get('header_params')


ditto, header_params can be used, instead of partial_object here

yliaog · 2021-04-30T18:44:39Z

dynamic/client.py

+        if params.get('header_params') is not None:
+            partial_object = params.get('header_params')
+            if 'PartialObjectMetadata' in partial_object.get('Accept'):
+                header_params['Accept'] = 'application/json;as=PartialObjectMetadata;v=v1;g=meta.k8s.io'


better to just take whatever is passed, instead of overwriting it here, i think. so if header_params['Accept'] is present, then do nothing, otherwise, set the default ['application/json', 'application/yaml']

+1 to what Yu said. Let's make the dynamic client dynamic. I'm interested to see how this feature will work with things like as=Table (what kubectl uses)

dynamic/test_client.py

roycaihw · 2021-04-30T20:54:45Z

After this is merged and included in the main repo, we should have an example for this feature.

/kind feature

roycaihw · 2021-05-06T16:09:44Z

/lgtm
/approve
Thanks!

k8s-ci-robot · 2021-05-06T16:09:48Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: roycaihw, Yashks1994

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roycaihw · 2021-05-06T16:32:10Z

dynamic/client.py

-        header_params['Accept'] = self.client.select_header_accept([
+
+        # User didn't specify the Accept header. Default it to json and yaml.
+        if not 'Accept' in header_params.keys():


you don't need .keys(), right?

Yes we can remove the .keys() its not much appropriate. I will make the change.

roycaihw · 2021-05-06T16:42:10Z

/lgtm

yliaog · 2021-05-06T16:44:04Z

/hold

yliaog · 2021-05-06T16:44:29Z

feel free to remove the hold once the case sensitivity is fixed

roycaihw · 2021-05-06T16:58:50Z

dynamic/client.py

-        header_params['Accept'] = self.client.select_header_accept([
+
+        # User didn't specify the Accept header. Default it to json and yaml.
+        if not 'Accept' in header_params:


my bad. Header names are not case sensitive, so it should be:

if not 'Accept' in header_params or not 'accept' in header_params:

[edit] the above is wrong as well. We should allow things like aCCEpt

I run both by passing 'Accept' and 'accept', it ran fine.

{'Accept': 'application/json;as=PartialObjectMetadataList;v=v1;g=meta.k8s.io'} PartialObjectMetadataList meta.k8s.io/v1 {'accept': 'application/json;as=PartialObjectMetadataList;v=v1;g=meta.k8s.io'} PartialObjectMetadataList meta.k8s.io/v1

Still I will make the necessary change.

roycaihw · 2021-05-06T17:31:09Z

I think the next steps are:

find a solution to do case insensitive search for a key in dict. There are some options in https://stackoverflow.com/questions/3296499/case-insensitive-dictionary-search
add more test cases to make sure things like Accept accept aCCEpt etc work

roycaihw · 2021-05-06T18:40:52Z

dynamic/client.py

+        # Checking Accept header if True pass the user header else default it to json and yaml.
+        new_header_params = dict((key.lower(), value) for key, value in header_params.items())
+        if 'accept' in new_header_params:
+            header_params['Accept'] = new_header_params['accept']


if a user passes in an "accept" header, this will result in duplicated "Accept" and "accept" headers. You can simply do

if not 'accept' in new_header_params: header_params['Accept'] = self.client.select_header_accept([ 'application/json', 'application/yaml', ])

…om header

roycaihw · 2021-05-07T00:25:47Z

/lgtm
/hold cancel

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Support customizing “Accept” header kubernetes-client/python#1428

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chore(deps): update dependency kubernetes to v27 - autoclosed A-aung/python-docs-samples#182

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Support customizing “Accept” header #1428 #236

Support customizing “Accept” header #1428 #236

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Support customizing “Accept” header #1428 #236

Support customizing “Accept” header #1428 #236

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Yashks1994 commented Apr 27, 2021 • edited by roycaihw Loading

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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