tree a46bec4702ee79bc3a952626048a43f5d619858a
parent e68d1be018a203970377d652005bafa14c4bf2f0
author Ed Tanous <edtanous@google.com> 1674502090 -0800
committer Ed Tanous <ed@tanous.net> 1677713847 +0000

Implement ManagerDiagnosticData/ServiceRootUptimeSeconds

This property was added in Redfish 2022.2 to denote how long this
service has been up and available.

This implementation opts to go to systemd to get the bmcweb service
uptime rather than track it through internal process state, given that
systemd already has an API that tracks the bmcweb uptime, and bmcweb
attempts to keep as little state as possible.  Given that we already
have helper functions that give durations in milliseconds precision,
this patchset opts to keep the millisecond granularity, rather than
dropping to microsecond precision of the systemd API.  There are no use
cases that would require microsecond precision, so this patchset opts
for lower complexity.

Tested:
Redfish service validator passes.

GET /redfish/v1/Managers/bmc/ManagerDiagnosticData
Returns a ServiceRootUptime property.  Value matches systemctl status
bmcweb.
systemctl restart bmcweb, causes counter to reset.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ie1b82c5150f3374faf0ce376402eba410e59891d