diff options
Diffstat (limited to 'vendor/github.com/hashicorp/terraform/helper/schema/data_source_resource_shim.go')
-rw-r--r-- | vendor/github.com/hashicorp/terraform/helper/schema/data_source_resource_shim.go | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/terraform/helper/schema/data_source_resource_shim.go b/vendor/github.com/hashicorp/terraform/helper/schema/data_source_resource_shim.go new file mode 100644 index 00000000..5a03d2d8 --- /dev/null +++ b/vendor/github.com/hashicorp/terraform/helper/schema/data_source_resource_shim.go @@ -0,0 +1,59 @@ +package schema + +import ( + "fmt" +) + +// DataSourceResourceShim takes a Resource instance describing a data source +// (with a Read implementation and a Schema, at least) and returns a new +// Resource instance with additional Create and Delete implementations that +// allow the data source to be used as a resource. +// +// This is a backward-compatibility layer for data sources that were formerly +// read-only resources before the data source concept was added. It should not +// be used for any *new* data sources. +// +// The Read function for the data source *must* call d.SetId with a non-empty +// id in order for this shim to function as expected. +// +// The provided Resource instance, and its schema, will be modified in-place +// to make it suitable for use as a full resource. +func DataSourceResourceShim(name string, dataSource *Resource) *Resource { + // Recursively, in-place adjust the schema so that it has ForceNew + // on any user-settable resource. + dataSourceResourceShimAdjustSchema(dataSource.Schema) + + dataSource.Create = CreateFunc(dataSource.Read) + dataSource.Delete = func(d *ResourceData, meta interface{}) error { + d.SetId("") + return nil + } + dataSource.Update = nil // should already be nil, but let's make sure + + // FIXME: Link to some further docs either on the website or in the + // changelog, once such a thing exists. + dataSource.deprecationMessage = fmt.Sprintf( + "using %s as a resource is deprecated; consider using the data source instead", + name, + ) + + return dataSource +} + +func dataSourceResourceShimAdjustSchema(schema map[string]*Schema) { + for _, s := range schema { + // If the attribute is configurable then it must be ForceNew, + // since we have no Update implementation. + if s.Required || s.Optional { + s.ForceNew = true + } + + // If the attribute is a nested resource, we need to recursively + // apply these same adjustments to it. + if s.Elem != nil { + if r, ok := s.Elem.(*Resource); ok { + dataSourceResourceShimAdjustSchema(r.Schema) + } + } + } +} |