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data_source_resource_shim.go
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data_source_resource_shim.go
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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)
}
}
}
}