Undertow proxy handler + RequestLimit handler issue
by paroczizs
Hi Undertow Dev,
we built a custom integration component based on Wildfly 11 with Undertow
1.4.18. The application contains a couple of custom and built in handlers.
We found the following:
There is a RequestLimit handler right at the beginning and finally the
proxy handler. When the backend getting to be slow and the load is
relatively high the RequestLimit handler does its job queues the request
then throws the request above the queue. When the proxy times out it starts
to consume the queue, in some cases the exception below occurs and we found
that in this case the counter in the RequestLimit handler is not reduced
and the it can stuck the way to the backend.
Are there any possibility to handle the exception in a custom handler?
Thank you in advance, Zsolt
2018-11-28 12:02:19,518 ERROR [io.undertow.proxy] (default I/O-2) UT005028:
Proxy request to /lwi/optinus/getentityanswersservice failed:
java.nio.channels.ClosedChannelException
at
io.undertow.client.http.HttpClientConnection$5.handleEvent(HttpClientConnection.java:194)
at
io.undertow.client.http.HttpClientConnection$5.handleEvent(HttpClientConnection.java:173)
at
org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
at
org.xnio.StreamConnection.invokeCloseListener(StreamConnection.java:80)
at org.xnio.Connection.close(Connection.java:142)
at org.xnio.IoUtils.safeClose(IoUtils.java:152)
at io.undertow.util.ConnectionUtils$3.run(ConnectionUtils.java:102)
at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:612)
at org.xnio.nio.WorkerThread.run(WorkerThread.java:479)
6 days, 18 hours
Creating a websocket proxy with undertow
by Marc Boorshtein
Using the 1.4 series, I'm trying to handle upgrade and websockets. Looking
at a few examples and the code I think what I need to do is:
1. add the WebSocketServlet to the right path
2. implement WebSocketConnectionCallback that will call my remote ws://
server
Am I on the right track? I haven't found an example of doing this with
undertow but found something similar with jetty (
https://github.com/chipster/chipster-web-server/blob/master/src/main/java...)
but I havne't found the same thing for undertow so any pointers would be
appreciated.
Thanks
Marc Boorshtein
1 month
Issue with Undertow Client and SSL
by Thomas Segismont
Hi,
Openshift Origin uses Hawkular Metrics to store node and container data. In
this scenario, Hawkular Metrics calls the Kubernetes master server over
HTTPS to validate the client identity. This is implemented with Undertow
Client, as part of a ServletExtension (inside Wildfly 10) [1]. Works fine
in development and testing.
Now the Openshit team sees errors in the logs [2][3]. I couldn't reproduce
yet. Errors come in pair, first the "UT005001: An exception occurred
processing the request: java.lang.IllegalStateException: XNIO000017: Buffer
was already freed", and just after "XNIO001007: A channel event listener
threw an exception: java.lang.NullPointerException".
Does that ring a bell? I haven't been able to find a starting point by
looking into the source the code.
Thanks
--
Thomas Segismont
JBoss ON Engineering Team
[1] https://git.io/vrNyP
[2] https://issues.jboss.org/browse/HWKMETRICS-408
[3] https://issues.jboss.org/secure/attachment/12405779/hawkular.log
2 months
Correctly shutting down a websocket handler
by Robin Anil
When a client disconnects, I see that onClose is not being fired. The only
way this seems to be firing if client sents a close frame.
Is there any way to detect disconnection and immediately close all the
opened resources.
Robin
Robin Anil | Software Engineer
2 years, 7 months
Delay execution of a HttpHandler
by Bill O'Neil
Hello,
I'm looking for a way to add artificial latency to requests and I'm having
trouble finding a way that wouldn't require a blocking pool with 1 thread
per request.
What I would like to happen if possible.
handler marks exchange as not ready (yield / pause)
async runnable from another thread marks it ready to resume after some time
next iteration of IO loop catches that it is ready and actually executes it
now.
public void handle(HttpServerExchange exchange) {
if (firstExecution) {
scheduledExec.schedule(() -> exchange.resume(), duration, unit);
return;
}
next.handle(exchange);
}
Is something like this possible while staying on the IO threads the whole
time other than the ScheduledExecutorService? I was thinking of using
dispatch and dispatching back to the IO executor but I don't think that
will do what I intend.
The end goal would be a way to handle N requests with various delays built
in to simulate latency without blocking connections. For instance if the
worker pool has 30 threads and I submit 100 requests with a 1 minute delay
followed by 1 request with a 10 second delay the final request should come
back first.
Thanks,
Bill
7 years, 3 months
