10:31 a.m.
Thank you for your answers. I understand I need to explicitly set MDC in
worker thread. Problem is I cannot modify the codebase of application that
runs on Wildfly. Actually it is a war deployed into Wildfly, and I cannot
re-build it. I want to customize only undertow/wildfly.
The custom handler I add this way runs in IO thread:
/subsystem=undertow/configuration=filter/custom-filter=correlation:add(module="com.ingrammicro.idp.undertow-correlation",class-name=com.ingrammicro.idp.CorrelationHandler)
/subsystem=undertow/server=default-server/host=default-host/filter-ref=correlation:add()
But from stacktrace I see multiple handlers run in worker thread:
handleRequest:43, PredicateHandler (io.undertow.server.handlers)
handleRequest:68, RedirectDirHandler (io.undertow.servlet.handlers)
handleRequest:132, SSLInformationAssociationHandler
(io.undertow.servlet.handlers.security)
handleRequest:57, ServletAuthenticationCallHandler
(io.undertow.servlet.handlers.security)
Also, I can add an expression handler that runs in worker thread:
/subsystem=undertow/configuration=filter/expression-filter=IM_private:add(,expression="path-template('/auth/realms/{realm}/restart-session')
-> ip-access-control(acl={'127.0.0.1 allow', '0:0:0:0:0:0:0:1
allow'})")
/subsystem=undertow/server=default-server/host=default-host/filter-ref=IM_private:add()
Is it possible to add a custom handler to run in a worker thread?
ср, 3 июн. 2020 г. в 10:23, Andrea Di Cesare <andrea(a)softinstigate.com>:
If a thread switch occurs the MDC context is lost.
You can attach it to the exchange:
public static final AttachmentKey<Map<String, String>> MDC_CONTEXT_KEY =
AttachmentKey.create(Map.class);
....
exchange.putAttachment(MDC_CONTEXT_KEY, MDC.getCopyOfContextMap());
...
and then restore it in your worker thread:
MDC.setContextMap(exchange.getAttachment(MDC_CONTEXT_KEY));
Hope this helps,
Andrea Di Cesare
Partner at Soft*Instigate* <https://softinstigate.com/>
MongoDB Technology Partner
<https://sched.co/b2Hz>
Via Copernico 38, 20125 Milano (Italy)
Mobile: +39 329 737 6417
Skype: ujibang
The company behind *REST*Heart <https://restheart.org>;, the NoCoding and
NoSQL Platform for MongoDB
Il giorno mar 2 giu 2020 alle ore 14:57 Мартынов Илья <
imartynovsp(a)gmail.com> ha scritto:
> Hello,
>
> I've created a handler to fill MDC from incoming request header.
> public class CorrelationHandler implements HttpHandler
> {
> private HttpHandler next;
> public CorrelationHandler(HttpHandler next) {
> this.next = next;
> }
> @Override
> public void handleRequest(HttpServerExchange e) throws Exception {
> String corr = e.getRequestHeaders().getFirst("IDP-CORR-ID");
> MDC.put("corr", corr);
> next.handleRequest(e);
> }
> }
>
> But most of my processing is done in worker thread and mdc is not passed
> threre. How to pass it?
>
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