In order to efficiently build the module objects for evaluation, we need
to collect the outputs from a set of module instances. The ModuleOutputs
method will return a copy of the state outputs, while not requiring the
unnecessary copying of each entire module.
We need all module instance outputs to build the objects for evaluation,
but there is no need to copy all the resource instances along with that.
This allows us to only return the output states, with enough information
to connect them with their module instances.
The evaluationStateData needs the change to the GetModule method to work
with the new evaluator. This is using a deep copy of module instances,
which we will clean up after some changes to the states package.
Since modules need to be evaluated as whole objects, yet the outputs are
all handled individually, we need a method to collect and return all
output changes for a module from the plan, including all known
module instances.
Module references, like resource references, need to always return the
and object containing all instances in order to handle modules as single
values, and to postpone index evaluation to when the expression as whole
is evaluated.
In order to be able to use module values, and handle operations like
possibly invalid module indexes in conditional statements, whole modules
must always be returned during evaluation.
The providers command has been refactored to use the modern provider types and
ProviderRequirements() functions. This resulted in a breaking change to
the output: it no longer outputs the providers by module and no longer
prints `(inherited)` or `(from state)` to show why a provider is
included. We decided that at this time it was best to stick with the
existing functions and make this change, but if we get feedback from the
community we will revisit.
Additional tests to exercise providers in modules and providers from
state have been included.
This PR adds iteration through any provider configuration blocks in the
config in addProviderRequirements().
A stale comment (of mine!) would leave one expecting the
module.ProviderRequirements to include any requirements from provider
configs. The comment was inaccurate and has been updated.
This fixes several bugs:
- `substr("abc", 0, 0)` would previously return `"abc"`, despite the
length argument being `0`. This has been changed to return an empty
string when length is zero.
- `ceil(1/0)` and `floor(1/0)` would previously return a large integer
value, rather than infinity. This has been fixed.
Stop evaluating count and for each if they aren't set in the config.
Remove "Resource" from the function names, as they are also now used
with modules.
While we don't have any expansion info during validation, we can try to
evaluate variable expressions to catch some basic errors. Do this by
creating module instance RepetitionData with unknown values. This
unfortunately will still miss the incorrect usage of count/each values,
but that would require the module call's each mode, which is not
available at this time.
The variable nodes are not only used during plan and apply, so remove
those from there names. The "plan" node is now
`nodeExpandModuleVariable` and the "apply" node is now just
`nodeModuleVariable`.
Remove unnecessary methods, as the nodeModuleVariable is no longer used
in the full graph transformations.
The dag Update messages were not particularly helpful in the debugging
of terraform, and since we're going to be relying on DynamicExpand to an
even greater extent, this will eliminate a log of extra log output.
NodeModuleRemoved is redundant now with the concept of
nodeCloseModule, so we can replace it within the graph. This does mean
that nodeCloseModule needs to know if it's evaluating an orphaned module
that can't be expanded, but the overhead to checking this isn't too
bad.
Now that nodeModuleClose is referenceable, and we can ensure it's always
in the graph at the correct time, we can eliminate the need to connect
each resource to every single node within a module it references, and
instead connect only to the nodeModuleClose, which acts as the module
root. Since module expansion can cause exponential growth in the number
of edges in graphs, this will help with performance problems when
transforming and reducing these graphs by eliminating the bulk of
redundant edges. This will also help with general debugging, making the
graphs easier to read.
Daniel Dreier