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c937c06a03
Due to how deeply the configuration types go into Terraform Core, there isn't a great way to switch out to HCL2 gradually. As a consequence, this huge commit gets us from the old state to a _compilable_ new state, but does not yet attempt to fix any tests and has a number of known missing parts and bugs. We will continue to iterate on this in forthcoming commits, heading back towards passing tests and making Terraform fully-functional again. The three main goals here are: - Use the configuration models from the "configs" package instead of the older models in the "config" package, which is now deprecated and preserved only to help us write our migration tool. - Do expression inspection and evaluation using the functionality of the new "lang" package, instead of the Interpolator type and related functionality in the main "terraform" package. - Represent addresses of various objects using types in the addrs package, rather than hand-constructed strings. This is not critical to support the above, but was a big help during the implementation of these other points since it made it much more explicit what kind of address is expected in each context. Since our new packages are built to accommodate some future planned features that are not yet implemented (e.g. the "for_each" argument on resources, "count"/"for_each" on modules), and since there's still a fair amount of functionality still using old-style APIs, there is a moderate amount of shimming here to connect new assumptions with old, hopefully in a way that makes it easier to find and eliminate these shims later. I apologize in advance to the person who inevitably just found this huge commit while spelunking through the commit history.
101 lines
3.3 KiB
Go
101 lines
3.3 KiB
Go
package terraform
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import (
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"sync"
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"github.com/hashicorp/terraform/tfdiags"
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"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/terraform/addrs"
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"github.com/hashicorp/terraform/configs"
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"github.com/hashicorp/terraform/lang"
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)
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// Evaluator provides the necessary contextual data for evaluating expressions
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// for a particular walk operation.
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type Evaluator struct {
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// Operation defines what type of operation this evaluator is being used
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// for.
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Operation walkOperation
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// Meta is contextual metadata about the current operation.
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Meta *ContextMeta
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// Config is the root node in the configuration tree.
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Config *configs.Config
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// RootVariableValues is a map of values for variables defined in the
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// root module, passed in from external sources. This must not be
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// modified during evaluation.
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RootVariableValues map[string]*InputValue
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// State is the current state. During some operations this structure
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// is mutated concurrently, and so it must be accessed only while holding
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// StateLock.
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State *State
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StateLock *sync.RWMutex
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}
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// Scope creates an evaluation scope for the given module path and optional
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// resource.
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//
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// If the "self" argument is nil then the "self" object is not available
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// in evaluated expressions. Otherwise, it behaves as an alias for the given
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// address.
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func (e *Evaluator) Scope(modulePath addrs.ModuleInstance, self addrs.Referenceable) *lang.Scope {
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return &lang.Scope{
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Data: &evaluationStateData{
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Evaluator: e,
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ModulePath: modulePath,
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},
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SelfAddr: self,
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PureOnly: e.Operation != walkApply && e.Operation != walkDestroy,
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BaseDir: ".", // Always current working directory for now.
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}
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}
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// evaluationStateData is an implementation of lang.Data that resolves
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// references primarily (but not exclusively) using information from a State.
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type evaluationStateData struct {
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Evaluator *Evaluator
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// ModulePath is the path through the dynamic module tree to the module
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// that references will be resolved relative to.
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ModulePath addrs.ModuleInstance
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}
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// evaluationStateData must implement lang.Data
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var _ lang.Data = (*evaluationStateData)(nil)
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func (d *evaluationStateData) GetCountAttr(addrs.CountAttr, tfdiags.SourceRange) (cty.Value, tfdiags.Diagnostics) {
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panic("not yet implemented")
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}
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func (d *evaluationStateData) GetInputVariable(addrs.InputVariable, tfdiags.SourceRange) (cty.Value, tfdiags.Diagnostics) {
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panic("not yet implemented")
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}
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func (d *evaluationStateData) GetLocalValue(addrs.LocalValue, tfdiags.SourceRange) (cty.Value, tfdiags.Diagnostics) {
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panic("not yet implemented")
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}
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func (d *evaluationStateData) GetModuleInstance(addrs.ModuleCallInstance, tfdiags.SourceRange) (cty.Value, tfdiags.Diagnostics) {
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panic("not yet implemented")
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}
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func (d *evaluationStateData) GetModuleInstanceOutput(addrs.ModuleCallOutput, tfdiags.SourceRange) (cty.Value, tfdiags.Diagnostics) {
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panic("not yet implemented")
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}
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func (d *evaluationStateData) GetPathAttr(addrs.PathAttr, tfdiags.SourceRange) (cty.Value, tfdiags.Diagnostics) {
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panic("not yet implemented")
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}
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func (d *evaluationStateData) GetResourceInstance(addrs.ResourceInstance, tfdiags.SourceRange) (cty.Value, tfdiags.Diagnostics) {
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panic("not yet implemented")
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}
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func (d *evaluationStateData) GetTerraformAttr(addrs.TerraformAttr, tfdiags.SourceRange) (cty.Value, tfdiags.Diagnostics) {
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panic("not yet implemented")
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}
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