129 lines
4.2 KiB
Go
129 lines
4.2 KiB
Go
package terraform
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import (
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"context"
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"sync"
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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/configschema"
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"github.com/hashicorp/terraform/instances"
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"github.com/hashicorp/terraform/plans"
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"github.com/hashicorp/terraform/providers"
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"github.com/hashicorp/terraform/provisioners"
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"github.com/hashicorp/terraform/states"
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"github.com/hashicorp/terraform/tfdiags"
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)
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// ContextGraphWalker is the GraphWalker implementation used with the
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// Context struct to walk and evaluate the graph.
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type ContextGraphWalker struct {
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NullGraphWalker
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// Configurable values
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Context *Context
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State *states.SyncState // Used for safe concurrent access to state
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RefreshState *states.SyncState // Used for safe concurrent access to state
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Changes *plans.ChangesSync // Used for safe concurrent writes to changes
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InstanceExpander *instances.Expander // Tracks our gradual expansion of module and resource instances
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Operation walkOperation
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StopContext context.Context
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RootVariableValues InputValues
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// This is an output. Do not set this, nor read it while a graph walk
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// is in progress.
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NonFatalDiagnostics tfdiags.Diagnostics
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once sync.Once
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contexts map[string]*BuiltinEvalContext
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contextLock sync.Mutex
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variableValues map[string]map[string]cty.Value
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variableValuesLock sync.Mutex
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providerCache map[string]providers.Interface
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providerSchemas map[string]*ProviderSchema
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providerLock sync.Mutex
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provisionerCache map[string]provisioners.Interface
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provisionerSchemas map[string]*configschema.Block
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provisionerLock sync.Mutex
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}
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func (w *ContextGraphWalker) EnterPath(path addrs.ModuleInstance) EvalContext {
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w.contextLock.Lock()
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defer w.contextLock.Unlock()
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// If we already have a context for this path cached, use that
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key := path.String()
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if ctx, ok := w.contexts[key]; ok {
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return ctx
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}
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ctx := w.EvalContext().WithPath(path)
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w.contexts[key] = ctx.(*BuiltinEvalContext)
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return ctx
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}
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func (w *ContextGraphWalker) EvalContext() EvalContext {
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w.once.Do(w.init)
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// Our evaluator shares some locks with the main context and the walker
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// so that we can safely run multiple evaluations at once across
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// different modules.
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evaluator := &Evaluator{
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Meta: w.Context.meta,
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Config: w.Context.config,
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Operation: w.Operation,
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State: w.State,
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Changes: w.Changes,
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Schemas: w.Context.schemas,
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VariableValues: w.variableValues,
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VariableValuesLock: &w.variableValuesLock,
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}
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ctx := &BuiltinEvalContext{
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StopContext: w.StopContext,
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Hooks: w.Context.hooks,
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InputValue: w.Context.uiInput,
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InstanceExpanderValue: w.InstanceExpander,
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Components: w.Context.components,
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Schemas: w.Context.schemas,
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ProviderCache: w.providerCache,
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ProviderInputConfig: w.Context.providerInputConfig,
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ProviderLock: &w.providerLock,
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ProvisionerCache: w.provisionerCache,
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ProvisionerLock: &w.provisionerLock,
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ChangesValue: w.Changes,
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StateValue: w.State,
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RefreshStateValue: w.RefreshState,
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Evaluator: evaluator,
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VariableValues: w.variableValues,
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VariableValuesLock: &w.variableValuesLock,
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}
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return ctx
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}
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func (w *ContextGraphWalker) init() {
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w.contexts = make(map[string]*BuiltinEvalContext)
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w.providerCache = make(map[string]providers.Interface)
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w.providerSchemas = make(map[string]*ProviderSchema)
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w.provisionerCache = make(map[string]provisioners.Interface)
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w.provisionerSchemas = make(map[string]*configschema.Block)
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w.variableValues = make(map[string]map[string]cty.Value)
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// Populate root module variable values. Other modules will be populated
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// during the graph walk.
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w.variableValues[""] = make(map[string]cty.Value)
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for k, iv := range w.RootVariableValues {
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w.variableValues[""][k] = iv.Value
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}
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}
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func (w *ContextGraphWalker) Execute(ctx EvalContext, n GraphNodeExecutable) tfdiags.Diagnostics {
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// Acquire a lock on the semaphore
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w.Context.parallelSem.Acquire()
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defer w.Context.parallelSem.Release()
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return n.Execute(ctx, w.Operation)
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}
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