implement pod exec websockets v5 by aojea · Pull Request #2486 · kubernetes-client/python

aojea · 2025-12-14T22:12:55Z

/kind feature
/kind api-change
/kind deprecation

support new exec v5 websocket subprotocol

- [KEP]: https://github.com/kubernetes/enhancements/tree/master/keps/sig-api-machinery/4006-transition-spdy-to-websockets#proposal-new-remotecommand-sub-protocol-version---v5channelk8sio

cc: @yliaog @siyuanfoundation

k8s-ci-robot · 2025-12-14T22:13:04Z

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/lifecycle stale

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/lifecycle rotten

seans3 · 2026-04-23T17:17:46Z

/remove-lifecycle rotten

seans3 · 2026-04-23T17:18:22Z

/assign

seans3 · 2026-05-06T03:25:04Z

/lifecycle frozen

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seans3

This looks good and substantially complete.

One high-level observation: I believe falling back to v4.channel.k8s.io is the right approach for backwards compatibility, but we should probably note that for clusters < v1.30, the client will silently revert to the broken behavior and hang on EOF.

I've left a few minor inline comments mostly about tests and constants.

seans3 · 2026-05-06T03:40:00Z

                        del self._channels[channel]
                    return ret
+
+            if channel in self._closed_channels:


Do we need this same short-circuiting code in peek_channel and read_channel ?

seans3 · 2026-05-06T03:41:59Z

+        """Close a channel (v5 protocol only)."""
+        if self.subprotocol != V5_CHANNEL_PROTOCOL:
+            return
+        data = bytes([255, channel])


Should we define a constant (e.g. CLOSE_CHANNEL = 255 or V5_HALF_CLOSE = 255) for this magic number, and reference the constant?

+1 to have a constant

seans3 · 2026-05-06T03:45:04Z

+
+            mock_ws.send.assert_not_called()
+
+    def test_update_receives_close_v5(self):


Should we add an additional unit test to verify how readline_channel handles a closed channel with leftover data?

While the current unit tests cover the parsing of the close signal itself, the new logic you added inside readline_channel—which flushes the remaining buffer even if it lacks a newline—is currently untested. Having a test that asserts readline_channel successfully flushes leftover data (e.g. "hello") and then returns an empty string on the subsequent call would ensure this specific edge-case logic is protected from future regressions.

added tests also for read_channel and peek_channel to validate channels are drained and follow the expected semantics

seans3 · 2026-05-06T17:22:31Z

/assign @yliaog

yliaog · 2026-05-08T21:49:49Z

+                    # In Py3, iterating bytes gives int, but indexing bytes gives int.
+                    # websocket-client frame.data might be bytes.
+
+                    if channel == 255 and self.subprotocol == V5_CHANNEL_PROTOCOL: # v5 CLOSE


better to replace 255 with a constant

implementation is able to signal a channel is closed to the other side. Clients are also able to drain the closed channels.

k8s-ci-robot · 2026-05-12T14:13:35Z

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: aojea
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aojea · 2026-05-12T14:14:48Z

@seans3 @yliaog PTAL

seans3 · 2026-05-12T17:35:58Z

Looks great--thanks.

/lgtm

k8s-ci-robot · 2026-05-12T17:36:01Z

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Looks great--thanks.

/lgtm

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k8s-ci-robot requested a review from fabianvf December 14, 2025 22:12

k8s-ci-robot added the kind/api-change Categorizes issue or PR as related to adding, removing, or otherwise changing an API label Dec 14, 2025

k8s-ci-robot requested a review from roycaihw December 14, 2025 22:12

k8s-ci-robot added kind/deprecation Categorizes issue or PR as related to a feature/enhancement marked for deprecation. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Dec 14, 2025

k8s-ci-robot added the size/L Denotes a PR that changes 100-499 lines, ignoring generated files. label Dec 14, 2025

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k8s-ci-robot added lifecycle/rotten Denotes an issue or PR that has aged beyond stale and will be auto-closed. and removed lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. labels Apr 13, 2026

k8s-ci-robot removed the lifecycle/rotten Denotes an issue or PR that has aged beyond stale and will be auto-closed. label Apr 23, 2026

k8s-ci-robot assigned seans3 Apr 23, 2026

seans3 suggested changes May 6, 2026

View reviewed changes

k8s-ci-robot assigned yliaog May 6, 2026

yliaog reviewed May 8, 2026

View reviewed changes

implement pod exec v5

e557dec

implementation is able to signal a channel is closed to the other side. Clients are also able to drain the closed channels.

aojea force-pushed the exec_v5 branch from e177256 to e557dec Compare May 12, 2026 14:13

aojea changed the title ~~[WIP] implement pod exec v5~~ implement pod exec websockets v5 May 12, 2026

k8s-ci-robot removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label May 12, 2026


		mock_ws.send.assert_not_called()

		def test_update_receives_close_v5(self):

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