Friendlier handling of DeploymentHandshakeException from CLI in -webSocket mode

[jglick]

If the CLI client gets as far as authenticating the connection and establishing the WebSocket upgrade, then the remaining error handling is fairly well defined

jenkins/core/src/main/java/hudson/cli/CLICommand.java

Lines 223 to 237 in 48f7a0c

	* Exit code from the CLI command execution
	* <table>
	* <caption>Jenkins standard exit codes from CLI</caption>
	* <tr><th>Code</th><th>Definition</th></tr>
	* <tr><td>0</td><td>everything went well.</td></tr>
	* <tr><td>1</td><td>further unspecified exception is thrown while performing the command.</td></tr>
	* <tr><td>2</td><td>{@link CmdLineException} is thrown while performing the command.</td></tr>
	* <tr><td>3</td><td>{@link IllegalArgumentException} is thrown while performing the command.</td></tr>
	* <tr><td>4</td><td>{@link IllegalStateException} is thrown while performing the command.</td></tr>
	* <tr><td>5</td><td>{@link AbortException} is thrown while performing the command.</td></tr>
	* <tr><td>6</td><td>{@link AccessDeniedException} is thrown while performing the command.</td></tr>
	* <tr><td>7</td><td>{@link BadCredentialsException} is thrown while performing the command.</td></tr>
	* <tr><td>8-15</td><td>are reserved for future usage.</td></tr>
	* <tr><td>16+</td><td>a custom CLI exit error code (meaning defined by the CLI command itself)</td></tr>
	* </table>

and tested. However I noticed that lower-level errors making the connection were not reported gracefully by the client. (They are not reported very gracefully in the older -http mode either, but as of #7605 that is not used by default.)

Originally noticed in the context of a proprietary plugin sending a 401 response under certain circumstances, but in fact seems applicable also to the more mundane scenaio of a mistyped API token.

Note that the response body is not exposed by the Tyrus client (even importing implementation classes), so this cannot be displayed, only the status code and headers. I actually prototyped a rewrite to the JDK’s built-in WebSocket client, which offers access to the response, but the body is still empty. (It may be a good idea to do this rewrite anyway, to avoid an external dep and bloat in jenkins-cli.jar.)

Testing done

Without patch:

io.jenkins.cli.shaded.org.glassfish.tyrus.client.exception.DeploymentHandshakeException: Handshake error.
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.exception.Exceptions.deploymentException(Exceptions.java:38)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.ClientManager$3$1.run(ClientManager.java:622)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.ClientManager$3.run(ClientManager.java:657)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.ClientManager$SameThreadExecutorService.execute(ClientManager.java:810)
	at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:123)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.ClientManager.connectToServer(ClientManager.java:460)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.ClientManager.lambda$connectToServer$2(ClientManager.java:313)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.ClientManager.tryCatchInterruptedExecutionEx(ClientManager.java:324)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.ClientManager.connectToServer(ClientManager.java:313)
	at hudson.cli.CLI.webSocketConnection(CLI.java:360)
	at hudson.cli.CLI._main(CLI.java:313)
	at hudson.cli.CLI.main(CLI.java:101)
Caused by: io.jenkins.cli.shaded.org.glassfish.tyrus.client.auth.AuthenticationException: Credentials are missing.
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.auth.BasicAuthenticator.generateAuthorizationHeader(BasicAuthenticator.java:39)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.auth.BasicAuthenticator.generateAuthorizationHeader(BasicAuthenticator.java:34)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.client.TyrusClientEngine.createUpgradeRequest(TyrusClientEngine.java:214)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.container.jdk.client.JdkClientContainer$1.call(JdkClientContainer.java:117)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.container.jdk.client.JdkClientContainer$1.call(JdkClientContainer.java:108)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.container.jdk.client.ClientFilter.processRead(ClientFilter.java:183)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.container.jdk.client.Filter.onRead(Filter.java:111)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.container.jdk.client.Filter.onRead(Filter.java:113)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.container.jdk.client.Filter.onRead(Filter.java:113)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.container.jdk.client.TransportFilter$4.completed(TransportFilter.java:295)
	at io.jenkins.cli.shaded.org.glassfish.tyrus.container.jdk.client.TransportFilter$4.completed(TransportFilter.java:279)
	at java.base/sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:129)
	at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishRead(UnixAsynchronousSocketChannelImpl.java:447)
	at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(UnixAsynchronousSocketChannelImpl.java:195)
	at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(UnixAsynchronousSocketChannelImpl.java:217)
	at java.base/sun.nio.ch.EPollPort$EventHandlerTask.run(EPollPort.java:306)
	at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:113)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:840)

With:

CLI handshake failed with status code 401
Cache-Control: must-revalidate, no-cache, no-store
Content-Length: 456
Content-Type: text/html;charset=iso-8859-1
Date: Thu, 08 Aug 2024 21:20:07 GMT
Server: Jetty(10.0.22)
Set-Cookie: remember-me=; Path=/jenkins; Expires=Thu, 01-Jan-1970 00:00:00 GMT; Max-Age=0
WWW-Authenticate: Basic realm="Jenkins"
X-Content-Type-Options: nosniff

Proposed changelog entries

• Better display HTTP handshake errors (such as authentication issues) from the CLI in -webSocket mode.

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[timja]

/label ready-for-merge

---

This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.

Thanks!

[basil]

@jglick I have been seeing this test flake on Windows ever since this PR was merged:

https://ci.jenkins.io/job/Core/job/jenkins/job/master/6468/

The latest build has the same flake:

https://ci.jenkins.io/job/Core/job/jenkins/job/master/6479/

Can you please look at this before tomorrow's weekly to release to ensure that this flaky test doesn't hold up the release?

[basil]

FYI I can actually reproduce the failure on my Linux system, but not every time. Sometimes the new test passes, and sometimes the new test fails.

[basil]

I disabled the test in #9687 to avoid disrupting tomorrow's weekly release.

[basil]

I can't quite tell if this PR has any negative effects on the production code or not, so I just disabled the test. But if there are negative effects on the production code, we might want to revert the non-test changes in this PR as well.

[jglick]

I think the NPE is just something that would have confused the error reporting on a failed request to begin with, though I never tracked down the root bug in Tyrus.