February 2016 - undertow-dev - Jboss List Archives

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

1 year, 2 months

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Undertow and JMX

by Anastasios Livogiannis

Hello, Does Undertow support JMX for remote management? Is there any documentation that explains how JMX can be set up for Undertow? I would assume it's similar to the "sibling" projects WildFly and JBoss AS (use remote+http protocol and jboss-client.jar but I haven't made it to work, so I am wondering what I am missing). Thanks -- -- *Anastasios Livogiannis* *Think**near* | Software Engineer

8 years, 9 months

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How to get response bytes before they are sent

by Nagaraj,Vikas

Hello, Is it possible to get the full content of a response body before it's sent? I'm trying to sign the response and add this signature in a header. There was a similar question on this list a couple of weeks ago, but that one was about signing the incoming request. My current approach is, in HttpHandler.handleRequest(): - Create a javax.crypto.Signature object - Use HttpServerExchange. addResponseWrapper() to add a StreamSinkConduit that updates the Signature object as write() is called - Use HttpServerExchange.addResponseCommitListener() to add a callback that calls Signature.sign() when the response is ready to be sent Good in theory, but I'm finding that the sign happens before the updates - looks like the Conduit is only active as the response is being sent. Is there something else I should wrap to get the bytes as they're being added to the response? Even better would be if I could read them directly from the ResponseCommitListener.beforeCommit() callback. I can see the number of bytes that have been written, but not the actual data. Note: I'm using Undertow 1.2.x, as we're on WildFly 9. -- Vikas Nagaraj vikas.nagaraj(a)safenet-inc.com<mailto:vikas.nagaraj@safenet-inc.com> -- The information contained in this electronic mail transmission may be privileged and confidential, and therefore, protected from disclosure. If you have received this communication in error, please notify us immediately by replying to this message and deleting it from your computer without copying or disclosing it.

8 years, 9 months

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Undertow Websockets production tweak

by Ali Ok

Hi all, I will soon go live with a project of mine which uses Undertow. I was wondering if you could give me some advice on tweaking Undertow for the production use. The only things I found are: * http://undertow.io/undertow-docs/undertow-docs-1.3.0/index.html#common-li... * http://lists.jboss.org/pipermail/undertow-dev/2015-March/001169.html Number of configurable things on the documentation and also when I was reading the code drove me crazy :) My use case is: * Undertow only used as a websocket endpoint of an MMO game; no servlet or something * Binary data only (Protobufs, specifically) * 300-400 concurrent connections per server * High frequency of transfer, again per server (23 KB/s transfer out per connection; 1 KB/s transfer in per connection) * Limited server specs (1 core CPU, 1GB RAM) I know I cannot of course ask you the exact configuration. What I am looking for is some help at pointing at the right direction. Thanks, Ali -- My Blog: http://blog.aliok.com.tr Twitter: http://twitter.com/aliok_tr

8 years, 9 months

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Read request body in HttpHandler

by Friso van Vollenhoven

Hi all, I'm not sure if this is the right channel to go for help, but there seems to be no separate user list, so I'll take a shot here. I need to create a HttpHandler that fully reads the request body and stores it into a buffer or byte[] before ending the exchange. For this, I'm trying to digest what Undertow's RequestBufferingHandler does. It seems that I have to take care of the scenario where the handler is called before the entire request body is available on the stream by doing the following: - read from the stream - check whether I've hit the end of the stream when as many bytes as possible have been read - if not, register a listener on the stream and continue handling the request from there - if so, handle the request from the handler directly - finally close the stream Can someone assert that the above is correct? Also, are there general pointers to what I'd like to achieve (read the request body into a buffer)? Many thanks, cheers, Friso

8 years, 9 months

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Undertow changelog and latest features

by Girish Sharma

Hi all, I have been (not so frequently) visiting the github repository to find that new versions of undertow have been released. But when I visit undertow.io site, there is no information on what's new in the latest version. Thus, this post. Is there any changelog or what's new blog for Undertow 1.2, 1.3, 1.4 and/or 2.0? Regards -- Girish Sharma B.Tech(H), Civil Engineering, Indian Institute of Technology, Kharagpur

8 years, 9 months

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Let undertow pick a port

by Oliver Dain

I'm trying to write some unit tests with an embedded undertow server. I’d like to have the server find an open port. This makes the tests more robust in many ways. For example, tests can be run in parallel and if a socket is held in CLOSE_WAIT or something from a previous test the next test will still run and succeed. With most servers I’ve used you can pass 0 for the port and the server will find an open port. This doesn’t seem to be the case with Undertow. Even if that would work, I don't see a method like getPort() on the Undertow object so I don't know how I'd discover the port to which it bound. Is this possible?? Thanks, Oliver -- CTO, Analytic Spot 44 West Broadway #222 Eugene, OR 97401 analyticspot.com • 425-296-6556 www.linkedin.com/in/oliverdain

8 years, 9 months

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Undertow WebSocket maximum frame size

by Guggemos Dominik (INST/ECS1)

Hi, is it possible to limit the frame size of WebSocket messages sent from Undertow? I didn't find anything related in the configuration or options. Thanks, Dominik

8 years, 9 months

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Lightweight Service Bus for Orchestration of Microservices with mod_cluster in Undertow

by Erhard Siegl

Hi, I packed all buzzwords into the subject and I promise to talk about real issues from now on. This is about issue https://issues.jboss.org/browse/UNDERTOW-626, the background, possible solutions and workarounds. But first I’d like to thank Steward for his quick response to the issue and also to my problem with HotSpot 1.8.0_71. Build problem solved! The Background I live in a country that has 9 states. In the area I work, they share a datacenter. Some applications are organised centrally (one database for all states), some are organised locally (each state has its own database and its own application server). We have a rather big application that is organised locally. Since there are quite a few users and we want to have good availability, each state has at least two JBoss servers (EAP6.4 right now). So we have about 20 servers in production. The problem now is, that they don’t live an isolated life, but sometimes they have to talk to each other. And not only with each other but also with a few other applications, some of them organised locally, some centrally. Usually they communicate synchronously with web services. Usually web services are configured point-to-point. This creates quite some configuration challenge. And I’m not talking about micro services here. To ease the problem, a kind of hub and spoke architecture was introduced. Apache httpd with mod_jk is put in front of some applications. This eases configuration to some degree. But it has its downsides. When you kill the hub, all lights go out. Been there, done that, not fun! Also when you add some servers or applications, you have to configure the central mod_jk. The later problem can be solved with mod_cluster. I love mod_cluster! You don’t have to configure it. Just add servers, deploy or undeploy applications on JBoss, no configuration on the central hub necessary. Architects recommend a bus-architecture to overcome the downsides of a central hub. A service bus should have a decentral organisation similar to a hardware bus. Applications connect to the bus and should be able to exchange messages without further configuration. However, when I looked at products called “Enterprise Service Bus”, I had difficulties to see the bus, most look like hub and spoke architectures. The Idea But then the Undertow team announced the support for mod_cluster in Undertow, which got me really excited. Now it could be possible to create a service bus to connect WildFly servers. You just configure mod_cluster within WildFly and you send web service requests to your own server (localhost) instead of the real destination (https://developer.jboss.org/thread/249311). Because mod_cluster knows about the location of all other servers with the same multicast-address (the bus-adress), it sends the request to the final destination. A real service bus, almost configuration free and comes out of the box with WildFly. Is it only me or do others think as well that this could be a real burner? The Proof of Concept Yes, it does work! We created a setup with two nodes, which shows that the idea can work: https://github.com/AdrianFarmadin/modcluster-invmhttp-example Unfortunately we ran into a problem, which I was not able to solve properly until now. The Problem The problem is described in https://issues.jboss.org/browse/UNDERTOW-626. When you have local context and modcluster filter, modcluster sends requests first to other servers and creates a loop. The Solutions or Workarounds Excluding certain contexts In UNDERTOW-626 Steward suggests: <filter-ref name="modcluster" predicate="not path-prefix(/myapp)”/> Unfortunately i couldn’t test it until now, but I will soon. It could work for our special case, since we have only one application on one server and only a few contexts. Something like that would have to work: <filter-ref name="modcluster" predicate="not path-prefix(/myapp) and not path-prefix(/myappws) and not path-prefix(/myappadmin)”/> Additionally we don’t deploy or undeploy applications at runtime, so we don’t have to configure this dynamically. The solution will be problematic, if you e.g. undeploy one out of several applications on WildFly. Then you would have to reconfigure the predicate and remove some parts of the "and not path-prefix(/…)” This makes it rather difficult. In modcluster filter: Don’t handle context, if its from the local server In https://github.com/undertow-io/undertow/pull/356/files we tried to change the mod cluster filter such that it doesn’t forward a request if it the context exists on the local server. We used this for our proof of concept for which it worked. The problem is, that is uses conventions from WildFly to answer the question “What is my local jvmroute”. The system-property “jboss.node.name” is the default in WildFly, but thats not necessarily true otherwise. But we couldn’t find how to access the configuration property instance-id within undertow. Fix it in WildFly In https://github.com/undertow-io/undertow/pull/356 Steward pointed out that the problem should be solved in WildFly. Could you point us in a direction where we could go? We are willing to invest some time into this issue, but we don’t have enough inside knowledge from Undertow or WildFly jet. Put modcluster at the end of the handler chain Right now modcluster is invoked before the deployed applications are invoked. Maybe one could do it the other way round and invoke modcluster only if the deployed applications return “not found”? I just don’t know enough about Undertow to decide whether this is feasible or just a stupid idea. Other? The End Any remarks, ideas, and help are welcome. Erhard

8 years, 9 months

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Threading model used for handler processing.

by Jason Kania

Hi, I am trying to create what I call a URL mapping handler that maps path and query variables from the http request to java method parameters via annotations. It is a bit like what Spring or JAX-RS does. The intent is to reduce a bunch of the boilerplate associated with validation of incoming requests, but nothing more than that. One of the stumbling blocks I have come upon is threading model used in calling handlers. I am trying to understand if 1) there is only meant to be a single handler shared by multiple threads such that it must handle multithreading2) the handler instances are somehow cloned.3) one handler is being assigned to a single thread at a time. Without me diving into the code to figure this out, can someone please clarify this? To me this would be a good addition to the handler guide. Thanks, Jason

8 years, 9 months

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undertow-dev February 2016