* Add enhanced logging REST endpoints using systemd-journal-gatewayd
Add /host/logs/entries and /host/logs/{identifier}/entries to expose log
entries from systemd-journald running on the host. Use
systemd-journal-gatewayd which exposes the logs to the Supervisor via
Unix socket.
Current two query string parameters are allowed: "boot" and "follow".
The first will only return logs since last boot. The second will keep
the HTTP request open and send new log entries as they get added to the
systemd-journal.
* Allow Range header
Forward the Range header to systemd-journal-gatewayd. This allows to
select only a certain amount of log data. The Range header is a standard
header to select only partial amount of data. However, the "entries="
prefix is custom for systemd-journal-gatewayd, denoting that the numbers
following represent log entries (as opposed to bytes or other metrics).
* Avoid connecting if systemd-journal-gatewayd is not available
* Use path for all options
* Add pytests
* Address pylint issues
* Boot ID offsets and slug to identifier
* Fix tests
* API refactor from feedback
* fix tests and add identifiers
* stop isort and pylint fighting
* fix tests
* Update default log identifiers
* Only modify /host/logs endpoints
* Fix bad import
* Load log caches asynchronously at startup
* Allow task to complete in fixture
* Boot IDs and identifiers loaded on demand
* Add suggested identifiers
* Fix tests around boot ids
Co-authored-by: Mike Degatano <michael.degatano@gmail.com>
