terraform/terraform/graph_config_node.go

package terraform

import (
	"fmt"

	"github.com/hashicorp/terraform/config"
	"github.com/hashicorp/terraform/config/module"
	"github.com/hashicorp/terraform/dag"
)

// graphNodeConfig is an interface that all graph nodes for the
// configuration graph need to implement in order to build the variable
// dependencies properly.
type graphNodeConfig interface {
	dag.NamedVertex

	// All graph nodes should be dependent on other things, and able to
	// be depended on.
	GraphNodeDependable
	GraphNodeDependent
}

// GraphNodeConfigModule represents a module within the configuration graph.
type GraphNodeConfigModule struct {
	Module *config.Module
	Tree   *module.Tree
}

func (n *GraphNodeConfigModule) DependableName() []string {
	return []string{n.Name()}
}

func (n *GraphNodeConfigModule) DependentOn() []string {
	vars := n.Module.RawConfig.Variables
	result := make([]string, 0, len(vars))
	for _, v := range vars {
		if vn := varNameForVar(v); vn != "" {
			result = append(result, vn)
		}
	}

	return result
}

func (n *GraphNodeConfigModule) Name() string {
	return fmt.Sprintf("module.%s", n.Module.Name)
}

// GraphNodeConfigProvider represents a configured provider within the
// configuration graph. These are only immediately in the graph when an
// explicit `provider` configuration block is in the configuration.
type GraphNodeConfigProvider struct {
	Provider *config.ProviderConfig
}

func (n *GraphNodeConfigProvider) Name() string {
	return fmt.Sprintf("provider.%s", n.Provider.Name)
}

func (n *GraphNodeConfigProvider) DependableName() []string {
	return []string{n.Name()}
}

func (n *GraphNodeConfigProvider) DependentOn() []string {
	vars := n.Provider.RawConfig.Variables
	result := make([]string, 0, len(vars))
	for _, v := range vars {
		if vn := varNameForVar(v); vn != "" {
			result = append(result, vn)
		}
	}

	return result
}

// GraphNodeEvalable impl.
func (n *GraphNodeConfigProvider) EvalTree() EvalNode {
	return ProviderEvalTree(n.Provider.Name, n.Provider.RawConfig)
}

// GraphNodeProvider implementation
func (n *GraphNodeConfigProvider) ProviderName() string {
	return n.Provider.Name
}

// GraphNodeConfigResource represents a resource within the config graph.
type GraphNodeConfigResource struct {
	Resource *config.Resource
}

func (n *GraphNodeConfigResource) DependableName() []string {
	return []string{n.Resource.Id()}
}

func (n *GraphNodeConfigResource) DependentOn() []string {
	result := make([]string, len(n.Resource.DependsOn),
		len(n.Resource.RawCount.Variables)+
			len(n.Resource.RawConfig.Variables)+
			len(n.Resource.DependsOn))
	copy(result, n.Resource.DependsOn)
	for _, v := range n.Resource.RawCount.Variables {
		if vn := varNameForVar(v); vn != "" {
			result = append(result, vn)
		}
	}
	for _, v := range n.Resource.RawConfig.Variables {
		if vn := varNameForVar(v); vn != "" {
			result = append(result, vn)
		}
	}

	return result
}

func (n *GraphNodeConfigResource) Name() string {
	return n.Resource.Id()
}

// GraphNodeEvalable impl.
func (n *GraphNodeConfigResource) EvalTree() EvalNode {
	return &EvalSequence{
		Nodes: []EvalNode{
			&EvalValidateResource{
				Provider:     &EvalGetProvider{Name: n.ProvidedBy()},
				Config:       &EvalInterpolate{Config: n.Resource.RawConfig},
				ProviderType: n.ProvidedBy(),
			},
		},
	}
}

// GraphNodeProviderConsumer
func (n *GraphNodeConfigResource) ProvidedBy() string {
	return resourceProvider(n.Resource.Type)
}