tree 8863c5c0a328637f2b3bdc4432d92d57d466c578
parent 10d9405574bc9ae4b7253e145e999202c47f6b99
author Shawn McCarney <shawnmm@us.ibm.com> 1613434027 -0600
committer Shawn McCarney <shawnmm@us.ibm.com> 1613750181 +0000

regulators: Enhance SystemdJournal::getMessages()

Enhance the SystemdJournal::getMessages() method that obtains systemd
journal entries with a specified field value:
* Handle journal entries that do not have expected fields.  All journal
  fields are optional, so if a field is missing this is not an error
  condition.
* Use built-in filtering support provided by the systemd journal API.
  This will likely provide better performance.
* Use C++ std::string methods to perform field data parsing.
* Add short sleep before acquiring journal messages.  Otherwise recently
  added messages are sometimes not available.

Tested:
* Tested where journal entry is missing expected fields.
* Tested that built-in filtering support results in the desired set of
  journal entries.
* Tested field data parsing.  Tested where value has expected format and
  when it does not.
* Verified all journal entries, including the most recently added ones,
  are obtained.
* Tested error handling when each sd_journal_*() function fails.
* For complete test plan, see
  https://gist.github.com/smccarney/bd4e546a76ee05e4df939eb69e23daee

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I066492edc05691b240d768c5b99cfa6f07d83ddf