* feat: calculate retry wait time with exponential back-off
* test: add test for getWaitTime method
* feat: enforce random jitter between min value from previous iteration and current
* extract randomStagger to simplify tests and use Milliseconds to avoid float math.
* rename variables
* add test and rename comment
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Co-authored-by: Poonam Jadhav <poonam.jadhav@hashicorp.com>
While I'm at it, add a DurationMinusBufferDomain() function to calculate the min/max for a given call to DurationMinusBuffer() in order to keep the implementation details self-contained.
used to schedule a TTL check. e.g.
d := lib.DurationMinusBuffer(60 * time.Duration, 10 * time.Second, 16)
will return a duration between 46.875s and 50s.
Consolidate code duplication and tests into a single lib package. Most of these functions were from various **/util.go functions that couldn't be imported due to cyclic imports. The consul/lib package is intended to be a terminal node in an import DAG and a place to stash various consul-only helper functions. Pulled in hashicorp/go-uuid instead of consolidating UUID access.
Ronald