Previously this resource managed the set of keys as a whole rather than
the individual keys, and so it was unable to recognize when a particular
managed key is removed and delete just that one key from Consul.
Here this is addressed by recognizing that each key actually has its own
lifecycle, and detecting when individual keys are added and removed
without replacing the entire consul_keys instance.
Additionally this restores the behavior of updating the "value" attribute
on read, but restricts it only to blocks that already had a value so as
to avoid the quirkiness seen previously when we updated blocks that were
intended to be read-only. Updating the value is important now, because we
rely on this to detect and repair discrepancies between values stored in
Consul and values given in the configuration.
This change produces a change in the handling of the "delete" attribute.
Before it was considered only when the entire consul_keys resource was
deleted, but now it is considered also when a particular key block is
removed from within a resource.
Implementation notes:
* The hash implementation was not considering key value, causing "diffs
did not match" errors when a value was updated. Switching to default
HashResource implementation fixes this
* Using HashResource as a default exposed a bug in helper/schema that
needed to be fixed so the Set function is picked up properly during
Read
* Stop writing back values into the `key` attribute; it triggers extra
diffs when `default` is used. Computed values all just go into `var`.
* Includes a state migration to prevent unnecessary diffs based on
"key" attribute hashcodes changing.
In the tests:
* Switch from leaning on the public demo Consul instance to requiring a
CONSUL_HTTP_ADDR variable be set pointing to a `consul agent -dev`
instance to be used only for testing.
* Add a test that exposes the updating issues and covers the fixes
Fixes#774Fixes#1866Fixes#3023
Martin Atkins