Replace RRD with something JS based

[Jason Fesler]

The RRD libraries can be finicky; and I'm finding some behavior differences between versions. With a broad number of mirror sites, this is a problem.

The nightly script can be amended to emit javascript, placed in the "site" directory. This javascript can contain the raw data it takes to generate charts. This is pretty straight forward - except for the part where I need at least 20 mirrors to update to the latest script.

This should be broken down into a few tasks.

• Replacement script that updates the database, emits .js with table data
  • This will likely be a new script; and an ask that people also update their crontab
• Settle on a chart library (chart.js, google charts, etc) - input welcome
• Integration into build system, only emit javascript calls on the "stats" page
• Notification to the official mirror operators, who have stats enabled

Identifying operators to notify has been scripted:

jfesler@bender:~/falling-sky/source/sites/ % ./mirrors-with-stats-enabled.pl

[Jason Fesler]

dygraphs appears to work well.

[Jason Fesler]

https://github.com/falling-sky/source/wiki/InstallCharts

Top section.

Also quoted here:

Updating from a previous version?

Many of you are looking at this in response to a recent email (June 9, 2016).

• rsync -a [e-mail]:stable/extras/. falling-sky-extras
• Update your crontab
  • Remove falling-sky-chart.pl
  • Replace with falling-sky-dyngraphs-csv.pl
  • Optionally, add either --days 750 or --since 2010/05/10

Mine looks like this:

% crontab -l
# m h  dom mon dow   command
MAILTO=[e-mail]
*/15 * * * * rsync -avq "[e-mail]:stable/content/."  /var/www/. --delete --exclude site 
0 * * * * /home/jfesler/falling-sky-extras/falling-sky-dyngraphs-csv.pl --config /var/www/site/config.js --since 2010/05/01

[Jason Fesler]

Notifications have been sent, for all official mirrors that appear (via config.js) to display stats.