Dreamplug USB drive performance

I attached an USB drive to my new toy (dreamplug) to see what performance can I expect. Let me share the results:

dreamplug-debian:/mnt/disk# dd if=/dev/zero of=j bs=1024 count=1000000         
1000000+0 records in                                                           
1000000+0 records out                                                          
1024000000 bytes (1.0 GB) copied, 61.06 s, 16.8 MB/s                           
dreamplug-debian:/mnt/disk# dd if=j of=/dev/null bs=1024 count=1000000         
1000000+0 records in                                                           
1000000+0 records out                                                          
1024000000 bytes (1.0 GB) copied, 37.4651 s, 27.3 MB/s                         

I think I am happy with these results. The filesystem was reiserfs.

Lettuce from jenkins

In order to see, that during the development that I deliver business values, I tried out bdd. Technically lettuce is driving mechanize, which is sending request to the deployed application. The whole stuff is controlled by Jenkins. Lettuce threw an error:

.../lettuce/terminal.py", line 82, in get_terminal_size_unix
    return int(cr[1]), int(cr[0])
TypeError: int() argument must be a string or a number, not 'NoneType'

It happened after Jenkins was started from init.d I performed the following patch:


--- lettuce-0.1.34-py2.6.egg/lettuce/terminal.py.orig 2012-03-08 17:47:21.959735489 +0000
+++ lettuce-0.1.34-py2.6.egg/lettuce/terminal.py 2012-03-08 17:48:23.649788786 +0000
@@ -79,4 +79,4 @@
         except:
             cr = (25, 80)


-    return int(cr[1]), int(cr[0])
+    return int(cr[1] or 25), int(cr[0] or 80)

Anyhow, it seems, that it has already been fixed:

https://github.com/gabrielfalcao/lettuce/commit/06b26b6351959bf0f32aec5c01a0bc7f9a88988e

Send flash message from spring security

When I log in, I want to see a flash message, saying "Successful login"
So as you hit the login page, you are served by the secutity filter, and according to the PRG pattern, you will be redirected to the page originally requested. I extended spring's SavedRequestAwareAuthenticationSuccessHandler so that it will ask a SessionFlashMapManager to populate the flash message to the session.
On My context xml:
<bean class="somepackage.AuthenticationSuccessHandler" name="authSucc">
        <property name="messageKey" value="flashmessage"/>
        <property name="message" value="flashmessage.afterlogin"/>
</bean>
...

<security:http auto-config="true" use-expressions="true">
...
    <security:form-login login-page='/login' authentication-success-handler-ref="authSucc"/>
...
</security:http>
You have to define the value in your messages.properties:
flashmessage.afterlogin=Successful login

And its implementation is:


package somepackage;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler;
import org.springframework.web.servlet.FlashMap;
import org.springframework.web.servlet.support.SessionFlashMapManager;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/**
 * Created by matelakat at 3/9/12 7:44 PM
 */
public class AuthenticationSuccessHandler extends SavedRequestAwareAuthenticationSuccessHandler {
    final Logger logger = LoggerFactory.getLogger(AuthenticationSuccessHandler.class);


    private ApplicationContext applicationContext;
    private String messageKey;
    private String message;


    @Autowired
    public void setApplicationContext(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }


    public String getMessageKey() {
        return messageKey;
    }


    public void setMessageKey(String messageKey) {
        this.messageKey = messageKey;
    }


    public String getMessage() {
        return message;
    }


    public void setMessage(String message) {
        this.message = message;
    }


    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
                                        Authentication authentication) throws ServletException, IOException {
        SessionFlashMapManager sessionFlashMapManager = new SessionFlashMapManager();
        FlashMap fm = new FlashMap();
        fm.put(getMessageKey(), getMessage());
        sessionFlashMapManager.saveOutputFlashMap(fm, request, response);
        super.onAuthenticationSuccess(request, response, authentication);
    }
}

On my freemarker template:
<#import "spring.ftl" as spring>
<#if flashmessage??>
    <div id="message"><@spring.message flashmessage/></div>
</#if>

Blink Thinkpad's light as a user

I want to get some feedback from my local jenkins instance, so I decided to ask Jenkins to blink my thinkpad's keyboard light.
I can control the light as root
# echo 255 > /sys/class/leds/tpacpi\:\:thinklight/brightness
# echo 0 > /sys/class/leds/tpacpi\:\:thinklight/brightness
But my Jenkins is running with a root account. This is where udev comes to play.
# udevadm info -q all -p /sys/devices/platform/thinkpad_acpi/leds/tpacpi\:\:thinklight/
P: /devices/platform/thinkpad_acpi/leds/tpacpi::thinklight
E: UDEV_LOG=3
E: DEVPATH=/devices/platform/thinkpad_acpi/leds/tpacpi::thinklight
E: SUBSYSTEM=leds
I tried to do it with the MODE keyword - FAIL:
# cat /etc/udev/rules.d/80-thinklight.rules
SUBSYSTEM=="leds", MODE="0666"
For some reason it did not set the permissions. I think some concepts are not clear enough for me.
So I went on another route, created a shell script to manipulate the permissions
$ cat /sbin/led.sh 
/bin/chmod o+w /sys/devices/platform/thinkpad_acpi/leds/tpacpi\:\:thinklight/brightness
And run it from udev:
$ cat /etc/udev/rules.d/99-thinklight.rules
SUBSYSTEM=="leds", RUN+="/bin/sh /sbin/led.sh"
Ugly, but WORKS

Lettuce and IPython interactive shell

Just doing the stuff with mechanize. At some point, it would be great to get an IPython console. so Why not?

@step(u'And give me IPython')                    
def and_continue_here(step):                   
    import IPython                             
    import sys                                 
    shell = IPython.InteractiveShell()         
    ip = IPython.core.ipapi.get()              
    p = IPython.core.debugger.Pdb(ip.colors)   
    p.reset()                                  
    p.interaction(sys._getframe(0), None)      

Javascript headless testing

Just a note, so that I won't forget. Use rhino and EnvJs to run jQuery code without a browser. In this way I would be able to test Unobtrusive Javascript code, to see it finds all elements on a rendered page.

BDD testdrive

I gave a try to BDD: looks really good. Fluent textual assertions. I tried out Lettuce. Fine vi syntax highlight stolen from the Cucumber project, see here: gvim syntax file for Gherkin. These are "heavy" functional tests, accessing the depolyed application. Mechanize was used to act as a browser. While I tried to write some assertions, I thought I need the power of jQuery. I asked an old friend of mine, PyQuery to help me. All the stuff was put together very quickly. Ask lettuce to create xUnit output, set up a Jenkins job, run after application deploy - I really like it.