Ring Google Group

[ANN] clj-webjars

2013-05-20T02:54:08Z

Hi,
I released a middleware to facilitate webjars <[link]>integration with ring.
Essentially it allows to serve assets from jar dependencies, abstracts
client from asset versions and honors http caching semantics.
You can find it here: [link]
Hope it helps!

Re: Exceptions

2013-05-14T11:46:35Z

I think it would be great feature for wrap-reload if it'll try to reload
namespaces which failed to compile.
What do you think?
-E

Re: Asynchronous Responses in Ring

2013-05-11T02:47:20Z

Oh sweet. Thanks Shen.

Tim Washington
Interruptsoftware.ca

No 6: "I'm not a number. I'M A FREE MAN!!!"
No 2: "HA HA HA HA HAAAAAAA"

-- The Prisoner

Re: Asynchronous Responses in Ring

2013-05-11T02:13:38Z

Hi, just stop here and find that the blog about http-kit is out of date,
the more recent documentation is here :
[link]

沈锋

Re: Asynchronous Responses in Ring

2013-05-10T17:20:28Z

Agreed. I did some digging around, and am going to try the Aleph route.

Thanks
Tim

Re: Asynchronous Responses in Ring

2013-05-10T16:43:16Z

Ring itself is not asynchronous, and will probably remain that way.

Asynchronous behaviour requires a more complex than Ring, and there are
several different approaches currently being tried out in libraries like
Pedestal, Aleph and Http-Kit.

Adding asynchronous behaviour to Ring would involve making a choice about

Asynchronous Responses in Ring

2013-05-10T15:00:36Z

I have an app, where the ring handler needs to make an asynchronous call to
an outside system. So ...
*i)* my web client would make a call.
*ii)* A ring handler would be invoked and the outside system called.
*iii)* After the ring handler function has exited, some prior handler-fn
would get a response.

Re: Exceptions

2013-05-09T07:46:26Z

Okay. Got it. Thank you!
I've solved it in this way:
(def dirty (atom []))
(defn wrap-reload-dirty
[handler & [options]]
(let [source-dirs (:dirs options ["src"])
modified-namespaces (ns-tracker source-dirs)]
(fn [request]
(let [dirty-ns @dirty]
(reset! dirty [])
(doseq [ns-sym (concat dirty-ns (modified-namespaces))]

Re: Exceptions

2013-05-08T10:02:38Z

That depends on the exception... You'll need to provide more information.

One possibility is that Clojure wasn't able to compile your namespace. I
don't believe wrap-reload retries namespaces if they fail to load.

- James

Exceptions

2013-05-08T09:40:43Z

Hello
I have a question. Why exception display only once and disappear when I
refresh a browser?
Thanks!

Re: NullPointerException with large file and multipart params

2013-05-02T09:07:12Z

It looks like this is a bug. The RequestContext interface that Ring uses to
talk to the Apache file upload library has the following method:

int getContentLength()

And the maximum size of an int is 2^32-1, which works out to be about the
number of bytes in 2 gigabytes. I suspect that the cause of your issue.

NullPointerException with large file and multipart params

2013-05-02T03:13:30Z

I can successfully upload files around 80mb, but when I've tried a file
that is over 2GB I get this stack trace:
java.lang.NullPointerException
at
ring.middleware.multipart_para ms$request_context$reify__1899 .getContentLength(multipart_pa rams.clj:23)
at
org.apache.commons.fileupload. FileUploadBase$FileItemIterato rImpl.<init>(FileUploadBase.ja va:936)

Re: Xss library

2013-04-25T15:58:03Z

I do use hiccup, so I guess that's why I'm looking for a solution.
Nelson Morris, thanks for the different options. I'm tempted to just use a
html5 hiccup macro similar to yours.
I will look into some more options but they will probably remain in the
template layer, because that's where I think it should be.

Re: Xss library

2013-04-25T15:49:36Z

Thanks for your help.
I will look to implement your template wrapper suggestion.
Here what I have so far
[link]
The html-escape function can just take a user-map from the database and
escape the values.
However, I would still have to put it into each db call.

Re: Xss library

2013-04-25T15:31:56Z

There are a number of templating libraries for clojure, some of which do
escaping automatically.

Non-escape by default:

hiccup

Escape by default:

laser
enlive (through net.cgrand.enlive-html/content )
stencil (or any other spec compliant mustache template lib)
clabango

I have a mokeypatching-esque hack on hiccup that turns it into escape by

Re: Xss library

2013-04-25T15:16:20Z

Sessions only hold temporary information, no matter whether they are stored
in a database or encoded directly in an encrypted cookie. When a user logs
out or switches browser, any information in the session is lost.

Typically you store data about a user in a database, and use sessions just

Re: Xss library

2013-04-25T14:38:09Z

I just used session as an example, because I figured it to be the best
place for the middleware.
When I used mongostore as my session store, everything I put into the ring
session was put into the database.
Is it not suppose to work like that?
I used session as an example because of the interaction with the database.

Re: Xss library

2013-04-25T10:43:00Z

You can use different session stores to save session data in a variety of
places, but where session data is stored has no effect on whether or not
it's vulnerable to a XSS.

A XSS occurs when you insert data from a user onto a HTML page without
escaping it first. Usually the session store just contains some reference

Re: Xss library

2013-04-25T03:49:53Z

I apologize for the confusion. I'm just starting to learn ring development.
As I understand, sessions in ring can use different store options such as
the database. Xss should be: validate on the way into the database, escape
on the way out.
I wan't to use my escape function on the way out, and not affect the data

Re: Xss library

2013-04-24T21:52:48Z

What do you mean by "call functions only when the data is being output"?

Could you provide some sort of an example to illustrate what you mean?

I'm also uncertain why you'd expect XSS attacks to come from data in the
session store. That seems somewhat unusual.

- James

Re: Is it possible to use Ring in an already existing Javaee project?

2013-04-18T22:47:51Z

Here's the strat I've used so far (and I haven't gotten it working yet).
I used the lein ring plugin to build an uberwar. I referred to this in the
ear pom as a system scope dependency. I'd prefer to have a better workflow
than this if possible but it's the first thing I could think of doing.
Unfortunately, when I visit the context path of this war, instead of

Is it possible to use Ring in an already existing Javaee project?

2013-04-18T20:10:53Z

We already have an existing application with EJBs, a WAR and an EAR. I've
already written a proof of concept of this new feature in javaee code. The
proof of concept is a new WAR that runs inside the EAR and the WAR uses
basic auth (with a filter) and calls the already existing EJBs .
I'm wondering if it's possible to rewrite this proof of concept in Ring

[ANN] ring-rewrite 0.1.0

2013-04-06T20:51:32Z

Ring middleware for defining and applying rewrite/redirect rules. In many cases you can get away with ring-rewrite instead of writing Apache mod_rewrite rules. Based on rack-rewrite, but with a Clojure flavor.
[link]
(def redirect-handler
(fn [req]
(wrap-rewrite req

Re: Problem with static resources from webjars in a Ring app

2013-04-06T14:11:06Z

It appears as if there's no easy way of telling whether or not a resource
from a jar file is a directory or a file. Both seem to count as resources
to Java, with directories being zero-length files.

In general, compojure.route/resources is a better bet than using
wrap-resource, as it provides more flexibility in terms of route matching.

Re: Problem with static resources from webjars in a Ring app

2013-04-06T13:57:27Z

Thank you Nelson. I've added a route like you said:
(route/resources "/bootstrap/" {:root
"META-INF/resources/webjars/bo otstrap/2.3.1/"})
This is actually a better idea, because then I have only to change the
version number in one place when upgrading.
This is going to work out, as long as the issue is not resolved.

Re: Problem with static resources from webjars in a Ring app

2013-04-06T13:45:29Z

Oops. I was wrong. Using this in my production setup Chrome
automatically saved a file for me as it returned an
"application/octet-stream". So looks like I still have the issue, but
it doesn't matter as much since I'm not serving resources on "/".

Re: Problem with static resources from webjars in a Ring app

2013-04-06T13:42:11Z

I've had similar issues as well with webjars and wrap-resource. I
eventually wanted to change the url vs the jar path and ended up using
compojure.routes/resources as:

(compojure.route/resources "/foundation/"
{:root "META-INF/resources/webjars/fo undation/4.0.4/"})

Just checked my production site, and trying to find the directories

Re: Problem with static resources from webjars in a Ring app

2013-04-06T13:40:10Z

Steps to reproduce in a more general setting:
1)
$ lein new compojure reproduction
....
$ cd reproduction
2) edit project.clj and add [org.webjars/bootstrap "2.3.1"] to the
dependencies
3) edit src/reproduction/handler.clj and edit 'app':
(def app
(-> (handler/site app-routes)
(resource/wrap-resource "META-INF/resources/")))

Re: Problem with static resources from webjars in a Ring app

2013-04-06T13:27:58Z

Hi James,
Thank you for responding.
I've tried this and there is no difference.
Op zaterdag 6 april 2013 15:11:47 UTC+2 schreef James Reeves het volgende:

Re: Problem with static resources from webjars in a Ring app

2013-04-06T13:11:47Z

Have you tried using the resource path "META-INF/resources"?

In general, Java resource paths do not have a beginning "/".

- James

Problem with static resources from webjars in a Ring app

2013-04-06T10:32:02Z

Dear all,
I've added a static resource from webjars to my project.clj:
[org.webjars/bootstrap "2.3.1"]
which also pulls in [org.webjars/jquery "1.9.0"].
To make these available I have added this to my middleware:
(resource/wrap-resource "/META-INF/resources/")
Since I've done this, a GET request to "/" returns an empty page. After

Re: what are some common Jetty and Ring configurations and deployments?

2013-03-29T09:23:28Z

I use an uberjar with the standard jetty adapter, but I'm running from
Windows, so I use commons-daemon to make it run as a service.

Re: what are some common Jetty and Ring configurations and deployments?

2013-03-29T05:46:15Z

rssminer.net also use uberjar, almost the same with clojars.

[link]

lein uberjar

nohup java -server -Dsun.jnu.encoding=UTF-8 \

-Dfile.encoding=UTF-8 \

-Dsun.net.inetaddr.ttl=0 \

-Djava.net.preferIPv4Stack=tru e \

Re: what are some common Jetty and Ring configurations and deployments?

2013-03-29T04:35:50Z

clojars.org basically runs from an uberjar with

java -Xmx32m -server "-XX:OnOutOfMemoryError=kill -9 %p" -verbose:gc
-XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:+PrintGCDateStamps -cp
clojars-web-current.jar clojars.main 2>&1

It starts up a jetty instance as part of clojars.main,
[link].

what are some common Jetty and Ring configurations and deployments?

2013-03-29T00:43:23Z

I have very little experience with Java, the JVM, or the Java libraries
that Clojure often relies on. I am curious what other people are doing to
deploy their web apps? Is it common to use Jetty/Ring with Tomcat? What
about Jboss? Are any folks using a simple uberjar on sites with a lot of
traffic? Are there common configurations tweaks that "everyone" knows to

Re: Apache Benchmark kills Ring/Jetty at high levels of concurrency - easy fix?

2013-03-28T14:54:37Z

Thank you.

Re: Apache Benchmark kills Ring/Jetty at high levels of concurrency - easy fix?

2013-03-28T09:53:06Z

Some, like :port and :host can be configured directly. For everything else,
you need to supply a function to the :configurator option. This will give
you access to the Jetty Server object, from which you can access all the
connector options.

e.g.

(defn configure [server]
(-> server .getConnectors first (.setMaxIdleTime 30000)))

Re: Apache Benchmark kills Ring/Jetty at high levels of concurrency - easy fix?

2013-03-28T01:58:50Z

I am sorry for asking another ignorant question, but is there a way to
configure all of the options listed here:

[link]

How would I access them?

Re: Apache Benchmark kills Ring/Jetty at high levels of concurrency - easy fix?

2013-03-26T17:51:49Z

I have:

:jvm-opts ["-Xms256m" "-Xmx1000m" "-XX:-UseCompressedOops"])

I am adding this:

(run-jetty app {:max-threads 5000}) ?

and I will increase -Xmx to 2G. Thanks for those tips.

Re: Apache Benchmark kills Ring/Jetty at high levels of concurrency - easy fix?

2013-03-26T09:37:16Z

So have you written:

(run-jetty app {:max-threads 5000}) ?

Have you set the JVM memory with -Xmx1G or something suitably large?

- James

Re: Apache Benchmark kills Ring/Jetty at high levels of concurrency - easy fix?

2013-03-26T01:33:55Z

Hi, when ab testing, for example

*ab -n 100000 -c 5000 -k [link]
*
*
ab will try to open 5000 connections *all at once, *this is a big pressure
for jetty. But this does not happen on reality often. You can use many ab
for the test, each open a few thousands to jetty, then jetty will be

Re: Apache Benchmark kills Ring/Jetty at high levels of concurrency - easy fix?

2013-03-25T20:36:34Z

What have you set the :max-threads option of the Jetty adapter to? How much
memory have you assigned to the JVM instance?

- James

Apache Benchmark kills Ring/Jetty at high levels of concurrency - easy fix?

2013-03-25T19:58:41Z

I am still learning my way here. I have a simple Ring/Jetty app, I put it
on one server and start it, then I ssh to another server and hit it with
Apache Benchmark. It seems to be if the concurrency is too high (on ab)
then Jetty starts to fail -- 500 errors.
Is there an easy fix? Can I just give the app more memory as a JVM options

Re: Introducing Ganelon - micro-framework support AJAX in Ring web apps

2013-03-13T09:32:58Z

Ganelon can be easily extended using JavaScript client-side, so I am sure
that ClojureScript will work as well. I am still looking into how
ClojureScript enhancements can be more powerful than plain JavaScript ones.
Yes, Ganelon uses Ring middleware and Ring handlers (sometimes wrapped as
Compojure routes) and should work easily any Ring-compliant framework or

Re: Introducing Ganelon - micro-framework support AJAX in Ring web apps

2013-03-12T04:18:12Z

Interesting project. Surely a step forward for Clojure web frameworks.

*
*
ClojureScript support would be a great enhancement. And are less
stylesheets supported?

*
*

From the source, it looks like its implemented as Ring middleware. It is
compatible with any server framework that implements the Ring spec? A good

[ANN] uWSGI support for ring (early stage)

2013-03-08T14:37:45Z

Hi, folks,

Yesterday uWSGI had released a ring plugins to give basic support for
Clojure webdev.

- [link]
- [link]
- [link]
- [link]

Introducing Ganelon - micro-framework support AJAX in Ring web apps

2013-03-11T20:11:53Z

*Hi,
I've recently published a simple open source micro-framework which allows
server-side Clojure code to update web page content or invoke any
JavaScript operations dynamically through XHR requests and thin JavaScript
layer. *
*
Ganelon is fully Ring compatible and based on Compojure and lib-noir. Being

Re: Producing resource responses from ring with a sane Last-Modified header

2013-03-04T15:32:35Z

I missed last-modified in (Date. last-modified) in
ring/util/response.clj:171.

Re: Producing resource responses from ring with a sane Last-Modified header

2013-03-04T14:03:11Z

It should be (wrap-resource root), not #(wrap-resource root), but other
than that you're correct.

What makes you say that?

The resource-response function (in 1.2.0) uses the last modified date from
the resource connection, which in general is the modified date of the
containing jar file.

Re: Producing resource responses from ring with a sane Last-Modified header

2013-03-04T13:34:02Z

By accident posted incomplete message. The last (incomplete) piece of code
was intended to amend Last-Modified header for resources that are known to
be in JAR.