Jetty 12.0.x 12191 alt debug listener #12254
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…x.adoc Co-authored-by: Greg Wilkins <gregw@webtide.com>
…x.adoc Co-authored-by: Greg Wilkins <gregw@webtide.com>
…x.adoc Co-authored-by: Greg Wilkins <gregw@webtide.com>
gregw
requested changes
Sep 15, 2024
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| [[eeN-debug]] | ||
| == Module `{ee-all}-debug` | ||
| include::{jetty-home}/modules/ee10-debug.mod[tags=description] |
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There is N, all and 10 in this paragraph
| @@ -76,17 +95,44 @@ public boolean handle(Request request, Response response, Callback callback) thr | |||
| finally | |||
| { | |||
| // TODO this should be done in a completion event | |||
| print(name, "RESPONSE " + response.getStatus() + (ex == null ? "" : ("/" + ex)) + " " + response.getHeaders().get(HttpHeader.CONTENT_TYPE)); | |||
| log("<< r=%s async=false %d%n%s", rname, response.getStatus(), response.getHeaders()); | |||
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We have to fix the TODO. At the time this finally block is called, the response status and headers may not be set, or we may be in a race with them being set.
Also async= doesn't mean much anymore.
So we need to wrap the callback and look at the return of the handle call to log all the possible outcomes:
- handle == false then
log("XX r=%s") - handle == true, callback complete then
log("<< r=%s async=false ... - handle == true, callback not complete then
log("|| r=%s async=true ...
In the callback, it should also check if handling has exited and if so it would need to log("<< r=%s ...
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This is an alternate solution to debug logging using the
DebugHandlerclass instead of theeeXDebugListenerclasses (as per PR #12231).The problem with #12231 is that all
DebugListenerswill share the same log file, which will lead to contention and sequencing problems. The solution would be to ensure that each context uses its own log, however, at the point in time at which the debug log is configured, nothing reasonably identifying is known about the context to which it is being applied. This is because theeeX-debugmodules are applied before a context xml file that would configure identifying info about that context, such as the context path or the location of the war being deployed.This PR takes a different approach, and uses a single
DebugHandlerinserted into the handler list instead. This guarantees proper locking of debug log file entries. I've enhanced the output of it so it more closely resembles the output of theDebugListener. One notable omission in the logging is the identity of the context of the request being logged. This is because at the point in time that the DebugHandler executes we have not yet picked which context the request will be routed to.