Change Marathon provider to make just one API call instead of two per
configuration update by means of specifying embedded resources, which
enable retrieving multiple response types from the API at once. Apart
from the obvious savings in API calls, we primarily gain a consistent
view on both applications and tasks that allows us to drop a lot of
correlation logic. Additionally, it will serve as the basis for the
introduction of readiness checks which require application/task
consistency for correct leverage on the proxy end.
Additional changes:
marathon.go:
- Filter on tasks now embedded inside the applications.
- Reduce/simplify signature on multiple template functions as we do not
need to check for proper application/task correlation anymore.
- Remove getFrontendBackend in favor of just getBackend.
- Move filtering on enabled/exposed applications from `taskFilter` to
`applicationFilter`. (The task filter just reached out to the
applications anyway, so it never made sense to locate it with the
tasks where the filter was called once for every task even though the
result would never change.)
- Remove duplicate constraints filter in tasks, where it neither made
sense to keep as it operates on the application level only.
- Add context to rendering error.
marathon_test.go:
- Simplify and reduce numerous tests.
- Convert tests with high number of cases into parallelized sub-tests.
- Improve readability/structure for several tests.
- Add missing test for enabled/exposed applications.
- Simplify the mocked Marathon server.
marathon.tmpl:
- Update application/task iteration.
- Replace `getFrontendBackend` by `getBackend`.
When Secrets permissions have not been granted (which is likely to be
the case for users not needing the basic auth feature), the watch on the
Secrets API will never yield a response, thereby causing the controller
to never sync successfully, and in turn causing the check for all
controller synchronizations to fail consistently. Thus, no event will
ever be handled.
Update traefik dependencies (docker/docker and related)
- Update dependencies
- Fix compilation problems
- Remove vdemeester/docker-events (in docker api now)
- Remove `integration/vendor`
- Use `testImport`
- update some deps.
- regenerate the lock from scratch (after a `glide cc`)
- remove docker/docker from Traefik vendor (unused)
- use `ignore` for all Traefik vendor in integration glide.
- defined only integration specific version of the dependencies.
Log message produced by go-marathon was:
time="2017-06-28T09:08:19Z" level=debug msg="listenToSSE(): failed to
handle event: failed to decode the event type, content: , error: EOF"
The fix for this was done in the upstream project of go-marathon
donovanhide/eventsource.
Background is that Marathon periodically sends a \n over the SSE
subscription, in order to keep the connection alive. This was parsed as
empty event by the eventsource and published. go-marathon in turn was
not able to do something with this empty event was producing the log
message above. By getting rid of publishing empty events in the
downstream library, we also get rid of this log message.
Fixes a problem with UnreachableStrategy being available now in two
type-incompatible formats (object and string).
We also upgrade the transitive dependency
github.com/donovanhide/eventsource.
