These are a bunch of scripts CHIRP Radio uses to maintain its music library and broadcast stream. For more general info about CHIRP software see the CHIRP Project page.

You'll need Python greater than 2.5, virtualenv and pip. Change into the source tree, activate a virtualenv, and type these commands:

pip install -r requirements.txt
python setup.py develop
cp settings_local.py-dist settings_local.py

To run the test suite, type:

nosetests -v

Please follow PEP8 when writing code.

You can reach out to the CHIRP development community on our mailing list.

Here's how to import new music into the digital library so that it's available for DJs to play on our Traktor machine and also available in the online DJ Database.

If you're installing the app for the first time, read through settings.py and add any necessary settings overrides to settings_local.py. Here are some of the crucial settings:

• Set CHIRPRADIO_PATH to your source checkout of the CHIRP Radio internal app code.
• Make sure MUSIC_DROPBOX is correct.
• Make sure GOOGLE_APPENGINE_SDK_PATH is set to the latest Google App Engine SDK.

To run an import you either need to install the app (instructions above) or have a server admin grant you permissions to run an import within the CHIRP studio servers. At CHIRP, all scripts are run as the musiclib user.

First, enter into a musiclib shell:

sudo -u musiclib -i

Next, change into the source directory:

cd ~/chirpradio-machine

IMPORTANT: You should always run an import with screen or tmux so that your SSH connection does not abort a running job.

Run this command to see a list of the artists from the dropbox who are not already in the music library:

do_dump_new_artists_in_dropbox

Carefully proofread the list of new artists. If they are all correct, update the whitelist:

do_dump_new_artists_in_dropbox --rewrite

It's a rare possibility that you will get an error at this stage. Read on to the import section to see the options for resolving albums that produce errors.

If it ran without errors, proofread the whitelist by viewing the changes in context:

git diff chirp/library/data/artist-whitelist

If everything looks OK, commit the changes back to git:

git commit chirp/library/data/artist-whitelist -m "Adding new artists"
git push

Run the import script without any additional args, logging the output to a file:

do_periodic_import 2>&1 | tee ~/import.log

This might take a while to run.

Next, inspect the log file and see if any errors were reported. If they were, correct them and try again. Repeat this process until there are no more errors. Do not proceed if there are errors. If you can't resolve them, just move the culprit album aside temporarily.

There is a helper script to set aside albums when they are producing errors. This lets you continue with an import while the music director can correct the album and re-upload it. Let's say you hit an error with an album named Hair. Run this to set it aside:

sudo `which remove_from_dropbox` '/mnt/disk_array/public/Departments/Music Dept/New Music Dropbox/Hair'

After the problem albums have been set aside and you were able to do a dry-run without any errors, you can proceed with an additional flag to actually go ahead with the import.

However, it's really important that you don't interrupt this script while it's running. Be sure your SSH session will not timeout by using screen or something like that. Using screen is the best way to go through an import process.

do_periodic_import --actually-do-import

Again, do not interrupt the import script while it is running!

At this point everything in the dropbox has been imported, so it is safe to clean it out. This command will remove all files:

sudo `which empty_dropbox`

This command will create a file named output.nml in the current directory:

do_generate_collection_nml

Copy the new NML into Traktor's root directory:

install -m 0775 -g traktor output.nml /mnt/disk_array/traktor/TraktorProRootDirectory/new-collection.nml

At this point Traktor can be switched over to the new collection whereby you shut down Traktor, rename new-collection.nml to collection.nml and restart Traktor.

First, upload the new artists:

do_push_artists_to_chirpradio

To upload the album and track information, you must specify a "start timestamp" that tells the system which part of the library to upload. Each library import covers one or more timestamps, which are of the form "YYYYMMDD-HHMMSS". The timestamps are printed during the main import. It is usually OK to just use a timestamp corresponding to the date of the import with the time-of-day set to 0. For example, if you are importing on April 3rd 2011, you would use a start timestamp of "20110403-000000".

do_push_to_chirpradio --start-at=20120115-000000

If you don’t see any output from this command you probably entered the wrong timestamp. It should show you verbose output of all the new albums uploading to App Engine.

The stream archiver writes out mp3 archives of the stream in one hour chunks. This daemon currently runs as the archiver user in production.

The Barix box broadcasts on a separate IP reserved for the archiver to connect to. The archiver makes an HTTP connection on the same network in the CHIRP studio.

To fire it up type:

./bin/run_archiver.sh

Check the ARCHIVES_DIR setting for where to find the files. You'll see something like this in there:

archiver@musiclib:~/chirpradio-machine$ ls -1 /mnt/disk_array/archives/2013/03/22/
chirp-20130322-000000.019.mp3
chirp-20130322-010000.002.mp3
chirp-20130322-020000.011.mp3
chirp-20130322-030000.020.mp3
chirp-20130322-040000.003.mp3
chirp-20130322-050000.011.mp3
chirp-20130322-060000.025.mp3
chirp-20130322-070000.007.mp3
chirp-20130322-080000.017.mp3
chirp-20130322-090000.001.mp3
...
chirp-20130322-200000.003.mp3
chirp-20130322-210000.013.mp3
chirp-20130322-220000.023.mp3
chirp-20130322-230000.004.mp3

To check if the stream is up and see some basic stats, there's a small web page you can take a look at. This daemon currently runs as the barix user in production.

To start the web server type:

./bin/run_proxy_barix_status.sh