Marteinn / Blog

Use subdomain with S3 and django-storages (using boto)

admin — Thu, 10 May 2012 22:27:08 +0000

(I take for granted that everything else is installed and working properly)

Put this in your settings.py. Now django-storages will use the bucket-name as url root.

from boto.s3.connection import VHostCallingFormat

AWS_S3_CALLING_FORMAT = VHostCallingFormat()

Getting PIL to run on Ubuntu 11.04 in Virtualenv

admin — Sun, 29 Apr 2012 16:14:29 +0000

There are tons of posts out there showing different solutions, but not always pointing out platforms or with/without virtualenv. This code snippet explains how I got PIL to run in Ubuntu 11.04 using Virtualenv on a EC2 instance, plain and simple.

# Install image libraries

sudo apt-get install libjpeg-dev libjpeg62 libjpeg62-dev zlib1g-dev libfreetype6 libfreetype6-dev

# Install pip

sudo apt-get install python-pip 

# Install virtualenv

sudo pip install virtualenv

# Create virtual env

virtualenv –no-site-packages myproject.com

# Activate it

source bin/activate

# Run Pillow (a PIL drop-in replacement)

pip install Pillow

Credits: Stackoverflow

Note to self: Ident authentication failed for user ‘Ubuntu’

admin — Wed, 25 Apr 2012 13:53:18 +0000

Having problem with authentication failed using postgresql and you know your .pgpass is correct? Try using -U to indicate user.

Example:

pg_dump -U postgres db_name | gzip > /backup.gz

Remove SVN – AppleScript droplet

admin — Mon, 04 Jul 2011 17:57:15 +0000

Well, I know this type of droplet’s has been written before, but I have not seen much code shared. So here’s my take on it. Do like this. Just drop your folder, or folders if you like, onto the app and all the .svn folders will be cleaned.

on open current_files

        repeat with current_file in current_files

                – validate if the file as a folder

                if (current_file as string) ends with ":" then

                        try

                                set current_file_path to (POSIX path of the current_file as string)

                                do shell script "find  ’" & current_file_path & "’ -name ‘.svn’ | xargs rm -Rf"

                        end try

                end if

        end repeat

end open

I also added this as a gist under github. So please feel free to fork!
https://gist.github.com/1063705

Introducing AtomCart

admin — Sun, 13 Feb 2011 20:02:13 +0000

I was actually supposed to release this project a couple of weeks ago, but work interfered (it always seems to do so). Anyhow here is AtomCart. AtomCart is basicly a very lightweight shopping cart in its purest form (hence the name), built in javascript as a jQuery plugin. It does nothing else except hold a very lightweight interface shopping cart, that supports adding/removing cart items and basic sum calculations. Dead simple and very easy to implement.

AtomCart is hosted on Github, so you can find it here: https://github.com/marteinn/AtomCart

AS3Flobile: Altering the ScrollList dataProvider without forcing a scroll position reset.

admin — Mon, 25 Oct 2010 01:44:34 +0000

I was working with the AS3Flobile component ScrollList (its a great framework when doing mobile flash-development) and had the need to modify the dataProvider (I was making a continuous scroller), but everytime I changed the dataProvider the scroller would reset the scroll-position to x = 0, y = 0. After a little tinkering, I came up with a quick and dirty way to force the ScrollList to move to a position without a animation, and by doing so, making sure that the scroller starts at the same position as where we left off.

Of course, if anyone has a better solution, just post a comment at the end of this post!

Here it goes.

1. First we need to extend the BaseScrollViewportStrategy class. This could look something like this:

package se.marteinn.app.controls.viewport.context

{

        import com.custardbelly.as3flobile.controls.viewport.context.BaseScrollViewportStrategy;

        import com.custardbelly.as3flobile.controls.viewport.context.IScrollViewportStrategy;

        import flash.geom.Point;

        public class CustomScrollViewportStrategy extends BaseScrollViewportStrategy implements IScrollViewportStrategy

        {

                public function moveToStaticPoint( point:Point ):void

                {

                        _currentScrollPositionX = point.x;

                        _currentScrollPositionY = point.y;

                        _coordinate.x = _currentScrollPositionX;

                        _coordinate.y = _currentScrollPositionY;

                }

        }

}

2. Then we need to extend ScrollList and add this method: moveToStaticPoint and then override getDefaultScrollContext.

// This method sets a new scrolling position on both the ScollList itself and the strategy instance.
publicfunction moveToStaticPoint ( point:Point):void
{
var strategy:CustomScrollViewportStrategy;

        strategy = _scrollContext.strategy as CustomScrollViewportStrategy;


        _currentScrollPosition = point;

        strategy.moveToStaticPoint( point );

        _listHolder.x = point.x;

        _listHolder.y = point.y;
}
// And this method makes sure that we implement the new strategy element.

override protected function getDefaultScrollContext():IScrollViewportContext

{

        return new ScrollViewportMouseContext( new CustomScrollViewportStrategy() );

}

3. After that. You can use ScrollList like this.

var scrollList:MyScrollList;
// Dump the scrollPosition (clone() is important). We will use this position after the dataProvider has changed

position = scrollList.scrollPosition.clone();
// Do your stuff. for instance alter the dataProvider of the scroll list

// scrollList.dataProvider = updatedContent;
// Finish it off by running the moveToStaticPoint method. The ScrollList will now be set at the same position as where we started.

scrollList.moveToStaticPoint( position );

Finding your Google App Engine directory under OSX (with GoogleAppEngineLauncher installed)

admin — Sun, 03 Oct 2010 22:30:37 +0000

I stumbled upon this dilemma when I was trying to create a pydev google app engine project in the AptanaStudio 3 edi, to complete the wizard I had to set my google app engine directory.

After a bit of searching, I realized that the “google_appengine” directory was not placed in public on my harddrive, but hidden inside the GoogleAppEngineLauncher.app package (right klick on the application – choose show content).

So, if you run GoogleAppEngineLauncher on your mac, the path to your google app engine root is this:

/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/

Android: InteractiveScrollView

admin — Fri, 04 Jun 2010 02:20:14 +0000

This post is a simple follow up to Android: Understanding when ScrollView has reached the bottom where I have created a small plug and play widget which notifies when scroll bottom has been reached through a listener.

It works like this: InteractiveScrollView inherits from ScrollView and overrides onScrollChanged to validate scroll position. If bottom has been reached, onBottomReachedListener triggers.

Usage:

InteractiveScrollView scrollView;
scrollView = (InteractiveScrollView) findViewById( R.id.scrollView);

scrollView.setOnBottomReachedListener(new InteractiveScrollView.OnBottomReachedListener() {

                @Override

                public void onBottomReached() 

                {

                        // bottom reached

                }

});

View the class or download it here.

Android: Understanding when ScrollView has reached the bottom

admin — Wed, 12 May 2010 22:15:54 +0000

This snippet is pretty mutch as the title says, an example in detecting when ScrollView has reached the bottom. In this sample I extend ScrollView and then overrides the onScrollChanged method (inherited from View).

@Override
protectedvoid onScrollChanged(int l, int t, int oldl, int oldt)
{
// Grab the last child placed in the ScrollView, we need it to determinate the bottom position.
View view =(View) getChildAt(getChildCount()-1);

// Calculate the scrolldiff
int diff =(view.getBottom()-(getHeight()+getScrollY()));

// if diff is zero, then the bottom has been reached
if( diff ==0)
{
// notify that we have reached the bottom

                Log.d(ScrollTest.LOG_TAG, "MyScrollView: Bottom has been reached");
}
        super.onScrollChanged(l, t, oldl, oldt);

}

Cheers to this thread for helping me getting the calculations right.

Patching NetStreamClient

admin — Sun, 14 Feb 2010 10:55:41 +0000

I couple of days ago I noticed that my conceptual NetStreamClient was failing when connecting it towards a NetStream, the debugger threw errors regarding missing a Proxy implementation of getProperty.

The problem was when building the class I took for granted that NetStream referenced against the client object and invoked the callback function from the object when a callback took place. But the fact is that when you assign a client object to netstream it saves a reference to the callback function, not the client object itself. So it was clear why my class didnt work.

So I patched it up with the proxy implementation getProperty (it looks a bit hackish but it does the trick).

flash_proxy override function getProperty(name:*) : *

{

        var qName:QName = name as QName;

        return function ( …args ) : void

        {

                flash_proxy::callProperty( qName, args[0] );

        }

}

I also noticed that in my usage example I used an object instead of the NetStreamClientEvent. So this is how you “really” use it.

// create a instance
client = new NetStreamClient();
// assign the client

netStream.client = client;
// then just add listeners to the client
client.addEventListener( NetStreamClientEvent.CUE_POINT, client_cuePointHandler );
// an example of the handler function

function client_cuePointHandler ( event:NetStreamClientEvent ) : void

{

        // the info object holds the original data

        var info:Object;

        info = event.arguments[0];

        trace( [info.name, info.time, info.cuetype] );

}

Updated classes here: Download it here here, or view the NetStreamClient class here.