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simplify module expansion eval 

Make the expansion logic easier to follow, keeping the evaluation and
registration local to switch cases. We don't validate anything between
count or for_each (config loading should handle that), and we don't need
to keep relying on the count == -1 sentinel value.
This commit is contained in:
James Bardin 2020-04-05 10:46:36 -04:00
parent 60e407a59b
commit 5fda76e31d
1 changed files with 13 additions and 23 deletions
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36
terraform/node_module_expand.go
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@ -6,7 +6,6 @@ import (
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/configs"
"github.com/hashicorp/terraform/lang"
"github.com/hashicorp/terraform/states"
)
// graphNodeModuleCloser is an interface implemented by nodes that finalize the
@ -184,9 +183,7 @@ type evalPrepareModuleExpansion struct {
}
func (n *evalPrepareModuleExpansion) Eval(ctx EvalContext) (interface{}, error) {
eachMode := states.NoEach
expander := ctx.InstanceExpander()
_, call := n.Addr.Call()
// nodeExpandModule itself does not have visibility into how its ancestors
@ -194,29 +191,22 @@ func (n *evalPrepareModuleExpansion) Eval(ctx EvalContext) (interface{}, error)
// to our module, and register module instances with each of them.
for _, module := range expander.ExpandModule(n.Addr.Parent()) {
ctx = ctx.WithPath(module)
count, countDiags := evaluateResourceCountExpression(n.ModuleCall.Count, ctx)
if countDiags.HasErrors() {
return nil, countDiags.Err()
}
if count >= 0 { // -1 signals "count not set"
eachMode = states.EachList
}
forEach, forEachDiags := evaluateResourceForEachExpression(n.ModuleCall.ForEach, ctx)
if forEachDiags.HasErrors() {
return nil, forEachDiags.Err()
}
if forEach != nil {
eachMode = states.EachMap
}
switch eachMode {
case states.EachList:
switch {
case n.ModuleCall.Count != nil:
count, diags := evaluateResourceCountExpression(n.ModuleCall.Count, ctx)
if diags.HasErrors() {
return nil, diags.Err()
}
expander.SetModuleCount(module, call, count)
case states.EachMap:
case n.ModuleCall.ForEach != nil:
forEach, diags := evaluateResourceForEachExpression(n.ModuleCall.ForEach, ctx)
if diags.HasErrors() {
return nil, diags.Err()
}
expander.SetModuleForEach(module, call, forEach)
default:
expander.SetModuleSingle(module, call)
}