schedule.rb: Add cron job to update parent imports from child imports

This task will run every 5 minutes, synchronising parent imports with
the status of their children.

When all children have finished, if none of them have failed, the parent
import should get a status of "successful":

    WorkbenchImport status: :successful
      NetexImport status: :successful
      NetexImport status: :successful

When all children have finished, if any of them have failed, the parent
import should get a status of "failed":

    WorkbenchImport status: :failed
      NetexImport status: :failed
      NetexImport status: :successful

We need a Cron job for this instead of being able to do it via a Ruby
method because the thing that's setting the status on the sub-imports
when they're complete is the STIF Java IEV application. Thus there's no
way for our Ruby code to know that a sub-import has finished. Because of
that, we do this polling mechanism every five minutes to update the
imports that need updating.

Created a Rake task to use in the Whenever schedule because the `runner`
method from Whenever expanded to `script/rails`, which is a bloody
ancient file, and tries to run via JRuby lolwat. Didn't want to bother
adding a configuration to Whenever to use something more modern, and
didn't know whether the binstub in `bin/` for `rails` is available since
we don't commit those to the repo apparently (although I knew that fact
from before).

Refs #3511

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/tasks/imports.rake b/lib/tasks/imports.rake
new file mode 100644
index 000000000..6bc84acc8
--- /dev/null
+++ b/lib/tasks/imports.rake
@@ -0,0 +1,6 @@
+namespace :import do
+  desc "Notify parent imports when children finish"
+  task notify_parent: :environment do
+    ParentImportNotifier.notify_when_finished
+  end
+end