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package terraform
import (
"log"
"github.com/hashicorp/terraform/config"
"github.com/hashicorp/terraform/config/module"
)
// GraphNodeAttachProvider is an interface that must be implemented by nodes
// that want provider configurations attached.
type GraphNodeAttachProvider interface {
// Must be implemented to determine the path for the configuration
GraphNodeSubPath
// ProviderName with no module prefix. Example: "aws".
ProviderName() string
// Sets the configuration
AttachProvider(*config.ProviderConfig)
}
// AttachProviderConfigTransformer goes through the graph and attaches
// provider configuration structures to nodes that implement the interfaces
// above.
//
// The attached configuration structures are directly from the configuration.
// If they're going to be modified, a copy should be made.
type AttachProviderConfigTransformer struct {
Module *module.Tree // Module is the root module for the config
}
func (t *AttachProviderConfigTransformer) Transform(g *Graph) error {
if err := t.attachProviders(g); err != nil {
return err
}
return nil
}
func (t *AttachProviderConfigTransformer) attachProviders(g *Graph) error {
// Go through and find GraphNodeAttachProvider
for _, v := range g.Vertices() {
// Only care about GraphNodeAttachProvider implementations
apn, ok := v.(GraphNodeAttachProvider)
if !ok {
continue
}
// Determine what we're looking for
path := normalizeModulePath(apn.Path())
path = path[1:]
name := apn.ProviderName()
log.Printf("[TRACE] Attach provider request: %#v %s", path, name)
// Get the configuration.
tree := t.Module.Child(path)
if tree == nil {
continue
}
// Go through the provider configs to find the matching config
for _, p := range tree.Config().ProviderConfigs {
// Build the name, which is "name.alias" if an alias exists
current := p.Name
if p.Alias != "" {
current += "." + p.Alias
}
// If the configs match then attach!
if current == name {
log.Printf("[TRACE] Attaching provider config: %#v", p)
apn.AttachProvider(p)
break
}
}
}
return nil
}
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