Skip to content

Use namespace as global variable in Ansible Jinja templates

A simple task, or so I thought: in a Jinja template keep track of the number of items in a loop. And then use that count afterwards.

Disclaimer: the number of items is not equal the number of times the loop runs, so I can't use the loop variables.

Turns out that Jinja has other opinions, and variables inside a loop are all local. When a variable is changed inside the loop, the scoop of the variable stays local, and once the loop ends the original value of the variable is restored. That's even true for variables which are created outside the loop.

 

Continue reading "Use namespace as global variable in Ansible Jinja templates"
  • Twitter
  • Bookmark Use namespace as global variable in Ansible Jinja templates at del.icio.us
  • Facebook
  • Google Bookmarks
  • FriendFeed
  • Digg Use namespace as global variable in Ansible Jinja templates
  • Bloglines Use namespace as global variable in Ansible Jinja templates
  • Technorati Use namespace as global variable in Ansible Jinja templates
  • Fark this: Use namespace as global variable in Ansible Jinja templates
  • Bookmark Use namespace as global variable in Ansible Jinja templates at YahooMyWeb
  • Bookmark Use namespace as global variable in Ansible Jinja templates at Furl.net
  • Bookmark Use namespace as global variable in Ansible Jinja templates at reddit.com
  • Bookmark Use namespace as global variable in Ansible Jinja templates at blinklist.com
  • Bookmark Use namespace as global variable in Ansible Jinja templates at Spurl.net
  • Bookmark Use namespace as global variable in Ansible Jinja templates at Simpy.com
  • Bookmark Use namespace as global variable in Ansible Jinja templates at blogmarks
  • Bookmark Use namespace as global variable in Ansible Jinja templates with wists
  • wong it!
  • Bookmark using any bookmark manager!
  • Stumble It!
  • Identi.ca

Improve openHAB Rules response time

By default, openHAB only starts 5 threads to deal with execution of Rules. That's not a lot, and if all threads are busy, rules have to wait until a slot is free. This results in slow Rule response time.

This can be improved.

 

Continue reading "Improve openHAB Rules response time"
  • Twitter
  • Bookmark Improve openHAB Rules response time at del.icio.us
  • Facebook
  • Google Bookmarks
  • FriendFeed
  • Digg Improve openHAB Rules response time
  • Bloglines Improve openHAB Rules response time
  • Technorati Improve openHAB Rules response time
  • Fark this: Improve openHAB Rules response time
  • Bookmark Improve openHAB Rules response time at YahooMyWeb
  • Bookmark Improve openHAB Rules response time at Furl.net
  • Bookmark Improve openHAB Rules response time at reddit.com
  • Bookmark Improve openHAB Rules response time at blinklist.com
  • Bookmark Improve openHAB Rules response time at Spurl.net
  • Bookmark Improve openHAB Rules response time at Simpy.com
  • Bookmark Improve openHAB Rules response time at blogmarks
  • Bookmark Improve openHAB Rules response time with wists
  • wong it!
  • Bookmark using any bookmark manager!
  • Stumble It!
  • Identi.ca

openHAB: Turn display on and off for a Video ChromeCast

After figuring out if a ChromeCast is currently used, it was time to fix a long-standing problem. At home we don't have TVs, just "dumb" displays, and stream content using ChromeCasts. However a video ChromeCast never really turns off, but keeps the display running, using a "Backdrop" app. This app keeps showing pictures on the display when the ChromeCast is not used otherwise, effectively preventing any powersafe mode.

That's both annoying (who wants to have pictures shown in the living room or working room all night), and consumes energy. It's also intentional by Google. So far we had to turn the display on and off manually, which is inconvenient.

 

Continue reading "openHAB: Turn display on and off for a Video ChromeCast"
  • Twitter
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast at del.icio.us
  • Facebook
  • Google Bookmarks
  • FriendFeed
  • Digg openHAB: Turn display on and off for a Video ChromeCast
  • Bloglines openHAB: Turn display on and off for a Video ChromeCast
  • Technorati openHAB: Turn display on and off for a Video ChromeCast
  • Fark this: openHAB: Turn display on and off for a Video ChromeCast
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast at YahooMyWeb
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast at Furl.net
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast at reddit.com
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast at blinklist.com
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast at Spurl.net
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast at Simpy.com
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast at blogmarks
  • Bookmark openHAB: Turn display on and off for a Video ChromeCast with wists
  • wong it!
  • Bookmark using any bookmark manager!
  • Stumble It!
  • Identi.ca

openHAB: detect if a ChromeCast is currently used or idle

We have a couple of Audio and Video ChromeCasts in use. For an upcoming project I need to figure out if any of them is currently used. That is different for the Audio and the Video devices: the Audio just goes idle=ON, the Video devices however load the "Backdrop" app and show pictures when idling. Google for whatever reason does not want the attached monitor to go in powersafe mode. So much for saving energy ...

All of the action needs between a few milliseconds and 2-3 seconds once you start/stop using the ChromeCast.

A previous blog post explains how I add the ChromeCast devices. And I have monitoring in place.

 

Continue reading "openHAB: detect if a ChromeCast is currently used or idle"
  • Twitter
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle at del.icio.us
  • Facebook
  • Google Bookmarks
  • FriendFeed
  • Digg openHAB: detect if a ChromeCast is currently used or idle
  • Bloglines openHAB: detect if a ChromeCast is currently used or idle
  • Technorati openHAB: detect if a ChromeCast is currently used or idle
  • Fark this: openHAB: detect if a ChromeCast is currently used or idle
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle at YahooMyWeb
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle at Furl.net
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle at reddit.com
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle at blinklist.com
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle at Spurl.net
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle at Simpy.com
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle at blogmarks
  • Bookmark openHAB: detect if a ChromeCast is currently used or idle with wists
  • wong it!
  • Bookmark using any bookmark manager!
  • Stumble It!
  • Identi.ca