122 lines
3.5 KiB
Go
122 lines
3.5 KiB
Go
package schema
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import (
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"context"
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"github.com/hashicorp/terraform/tfdiags"
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"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/terraform/config/hcl2shim"
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"github.com/hashicorp/terraform/configs/configschema"
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"github.com/hashicorp/terraform/terraform"
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)
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// Backend represents a partial backend.Backend implementation and simplifies
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// the creation of configuration loading and validation.
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//
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// Unlike other schema structs such as Provider, this struct is meant to be
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// embedded within your actual implementation. It provides implementations
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// only for Input and Configure and gives you a method for accessing the
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// configuration in the form of a ResourceData that you're expected to call
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// from the other implementation funcs.
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type Backend struct {
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// Schema is the schema for the configuration of this backend. If this
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// Backend has no configuration this can be omitted.
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Schema map[string]*Schema
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// ConfigureFunc is called to configure the backend. Use the
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// FromContext* methods to extract information from the context.
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// This can be nil, in which case nothing will be called but the
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// config will still be stored.
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ConfigureFunc func(context.Context) error
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config *ResourceData
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}
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var (
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backendConfigKey = contextKey("backend config")
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)
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// FromContextBackendConfig extracts a ResourceData with the configuration
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// from the context. This should only be called by Backend functions.
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func FromContextBackendConfig(ctx context.Context) *ResourceData {
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return ctx.Value(backendConfigKey).(*ResourceData)
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}
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func (b *Backend) ConfigSchema() *configschema.Block {
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// This is an alias of CoreConfigSchema just to implement the
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// backend.Backend interface.
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return b.CoreConfigSchema()
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}
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func (b *Backend) PrepareConfig(obj cty.Value) (cty.Value, tfdiags.Diagnostics) {
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if b == nil {
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return obj, nil
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}
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var diags tfdiags.Diagnostics
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shimRC := b.shimConfig(obj)
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warns, errs := schemaMap(b.Schema).Validate(shimRC)
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for _, warn := range warns {
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diags = diags.Append(tfdiags.SimpleWarning(warn))
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}
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for _, err := range errs {
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diags = diags.Append(err)
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}
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return obj, diags
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}
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func (b *Backend) Configure(obj cty.Value) tfdiags.Diagnostics {
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if b == nil {
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return nil
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}
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var diags tfdiags.Diagnostics
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sm := schemaMap(b.Schema)
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shimRC := b.shimConfig(obj)
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// Get a ResourceData for this configuration. To do this, we actually
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// generate an intermediary "diff" although that is never exposed.
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diff, err := sm.Diff(nil, shimRC, nil, nil, true)
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if err != nil {
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diags = diags.Append(err)
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return diags
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}
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data, err := sm.Data(nil, diff)
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if err != nil {
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diags = diags.Append(err)
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return diags
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}
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b.config = data
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if b.ConfigureFunc != nil {
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err = b.ConfigureFunc(context.WithValue(
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context.Background(), backendConfigKey, data))
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if err != nil {
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diags = diags.Append(err)
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return diags
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}
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}
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return diags
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}
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// shimConfig turns a new-style cty.Value configuration (which must be of
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// an object type) into a minimal old-style *terraform.ResourceConfig object
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// that should be populated enough to appease the not-yet-updated functionality
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// in this package. This should be removed once everything is updated.
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func (b *Backend) shimConfig(obj cty.Value) *terraform.ResourceConfig {
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shimMap := hcl2shim.ConfigValueFromHCL2(obj).(map[string]interface{})
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return &terraform.ResourceConfig{
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Config: shimMap,
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Raw: shimMap,
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}
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}
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// Config returns the configuration. This is available after Configure is
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// called.
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func (b *Backend) Config() *ResourceData {
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return b.config
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}
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