Commits on Jun 8, 2020

1. config: add HookWeakDecodeFromSlice …

   Currently opaque config blocks (config entries, and CA provider config) are
   modified by PatchSliceOfMaps, making it impossible for these opaque
   config sections to contain slices of maps.
   
   In order to fix this problem, any lazy-decoding of these blocks needs to support
   weak decoding of []map[string]interface{} to a struct type before
   PatchSliceOfMaps is replaces. This is necessary because these config
   blobs are persisted, and during an upgrade an older version of Consul
   could read one of the new configuration values, which would cause an error.
   
   To support the upgrade path, this commit first introduces the new hooks
   for weak decoding of []map[string]interface{} and uses them only in the
   lazy-decode paths. That way, in a future release, new style
   configuration will be supported by the older version of Consul.
   
   This decode hook has a number of advantages:
   
   1. It no longer panics. It allows mapstructure to report the error
   2. It no longer requires the user to declare which fields are slices of
      structs. It can deduce that information from the 'to' value.
   3. It will make it possible to preserve opaque configuration, allowing
      for structured opaque config.

   

   dnephin committed Jun 8, 2020
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