Mitchell Hashimoto 068b2b2dec terraform: add Meta field to diffs ...

This adds a Meta field (similar to InstanceState.Meta) to InstanceDiff.

This allows providers to store arbitrary k/v data as part of a diff and
have it persist through to the Apply. This will be used by helper/schema
for timeout storage being done by @catsby.

The type here is `map[string]interface{}`. A couple notes:

  * **Not using `string`**: The Meta field of InstanceState is a string
    value. We've learned that forcing things to strings is bad. Let's
    just allow types.

  * **Primitives only**: Even though it is type `interface{}`, it must
    be able to cleanly pass the go-plugin RPC barrier as well as be
    encoded to a file as Gob. Given these constraints, the value must
    only comprise of primitive types and collections. No structs,
    functions, channels, etc.

2017-01-31 11:50:37 -08:00

1.5 KiB

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