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