vendor/github.com/hashicorp/terraform/terraform/transform_attach_config_resource.go

   1 package terraform
   2
   3 import (
   4         "log"
   5
   6         "github.com/hashicorp/terraform/configs"
   7         "github.com/hashicorp/terraform/dag"
   8 )
   9
  10 // GraphNodeAttachResourceConfig is an interface that must be implemented by nodes
  11 // that want resource configurations attached.
  12 type GraphNodeAttachResourceConfig interface {
  13         GraphNodeResource
  14
  15         // Sets the configuration
  16         AttachResourceConfig(*configs.Resource)
  17 }
  18
  19 // AttachResourceConfigTransformer goes through the graph and attaches
  20 // resource configuration structures to nodes that implement
  21 // GraphNodeAttachManagedResourceConfig or GraphNodeAttachDataResourceConfig.
  22 //
  23 // The attached configuration structures are directly from the configuration.
  24 // If they're going to be modified, a copy should be made.
  25 type AttachResourceConfigTransformer struct {
  26         Config *configs.Config // Config is the root node in the config tree
  27 }
  28
  29 func (t *AttachResourceConfigTransformer) Transform(g *Graph) error {
  30
  31         // Go through and find GraphNodeAttachResource
  32         for _, v := range g.Vertices() {
  33                 // Only care about GraphNodeAttachResource implementations
  34                 arn, ok := v.(GraphNodeAttachResourceConfig)
  35                 if !ok {
  36                         continue
  37                 }
  38
  39                 // Determine what we're looking for
  40                 addr := arn.ResourceAddr()
  41
  42                 // Get the configuration.
  43                 config := t.Config.DescendentForInstance(addr.Module)
  44                 if config == nil {
  45                         log.Printf("[TRACE] AttachResourceConfigTransformer: %q (%T) has no configuration available", dag.VertexName(v), v)
  46                         continue
  47                 }
  48
  49                 for _, r := range config.Module.ManagedResources {
  50                         rAddr := r.Addr()
  51
  52                         if rAddr != addr.Resource {
  53                                 // Not the same resource
  54                                 continue
  55                         }
  56
  57                         log.Printf("[TRACE] AttachResourceConfigTransformer: attaching to %q (%T) config from %s", dag.VertexName(v), v, r.DeclRange)
  58                         arn.AttachResourceConfig(r)
  59                 }
  60                 for _, r := range config.Module.DataResources {
  61                         rAddr := r.Addr()
  62
  63                         if rAddr != addr.Resource {
  64                                 // Not the same resource
  65                                 continue
  66                         }
  67
  68                         log.Printf("[TRACE] AttachResourceConfigTransformer: attaching to %q (%T) config from %#v", dag.VertexName(v), v, r.DeclRange)
  69                         arn.AttachResourceConfig(r)
  70                 }
  71         }
  72
  73         return nil
  74 }