116 lines
3.6 KiB
Go
116 lines
3.6 KiB
Go
package schema
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import (
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"encoding/json"
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"github.com/zclconf/go-cty/cty"
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ctyjson "github.com/zclconf/go-cty/cty/json"
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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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// DiffFromValues takes the current state and desired state as cty.Values and
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// derives a terraform.InstanceDiff to give to the legacy providers. This is
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// used to take the states provided by the new ApplyResourceChange method and
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// convert them to a state+diff required for the legacy Apply method.
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func DiffFromValues(prior, planned cty.Value, res *Resource) (*terraform.InstanceDiff, error) {
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return diffFromValues(prior, planned, res, nil)
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}
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// diffFromValues takes an additional CustomizeDiffFunc, so we can generate our
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// test fixtures from the legacy tests. In the new provider protocol the diff
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// only needs to be created for the apply operation, and any customizations
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// have already been done.
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func diffFromValues(prior, planned cty.Value, res *Resource, cust CustomizeDiffFunc) (*terraform.InstanceDiff, error) {
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instanceState, err := res.ShimInstanceStateFromValue(prior)
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if err != nil {
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return nil, err
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}
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configSchema := res.CoreConfigSchema()
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cfg := terraform.NewResourceConfigShimmed(planned, configSchema)
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removeConfigUnknowns(cfg.Config)
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removeConfigUnknowns(cfg.Raw)
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diff, err := schemaMap(res.Schema).Diff(instanceState, cfg, cust, nil, false)
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if err != nil {
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return nil, err
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}
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return diff, err
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}
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// During apply the only unknown values are those which are to be computed by
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// the resource itself. These may have been marked as unknown config values, and
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// need to be removed to prevent the UnknownVariableValue from appearing the diff.
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func removeConfigUnknowns(cfg map[string]interface{}) {
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for k, v := range cfg {
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switch v := v.(type) {
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case string:
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if v == hcl2shim.UnknownVariableValue {
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delete(cfg, k)
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}
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case []interface{}:
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for _, i := range v {
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if m, ok := i.(map[string]interface{}); ok {
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removeConfigUnknowns(m)
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}
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}
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case map[string]interface{}:
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removeConfigUnknowns(v)
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}
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}
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}
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// ApplyDiff takes a cty.Value state and applies a terraform.InstanceDiff to
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// get a new cty.Value state. This is used to convert the diff returned from
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// the legacy provider Diff method to the state required for the new
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// PlanResourceChange method.
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func ApplyDiff(base cty.Value, d *terraform.InstanceDiff, schema *configschema.Block) (cty.Value, error) {
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return d.ApplyToValue(base, schema)
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}
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// StateValueToJSONMap converts a cty.Value to generic JSON map via the cty JSON
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// encoding.
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func StateValueToJSONMap(val cty.Value, ty cty.Type) (map[string]interface{}, error) {
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js, err := ctyjson.Marshal(val, ty)
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if err != nil {
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return nil, err
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}
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var m map[string]interface{}
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if err := json.Unmarshal(js, &m); err != nil {
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return nil, err
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}
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return m, nil
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}
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// JSONMapToStateValue takes a generic json map[string]interface{} and converts it
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// to the specific type, ensuring that the values conform to the schema.
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func JSONMapToStateValue(m map[string]interface{}, block *configschema.Block) (cty.Value, error) {
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var val cty.Value
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js, err := json.Marshal(m)
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if err != nil {
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return val, err
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}
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val, err = ctyjson.Unmarshal(js, block.ImpliedType())
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if err != nil {
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return val, err
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}
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return block.CoerceValue(val)
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}
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// StateValueFromInstanceState converts a terraform.InstanceState to a
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// cty.Value as described by the provided cty.Type, and maintains the resource
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// ID as the "id" attribute.
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func StateValueFromInstanceState(is *terraform.InstanceState, ty cty.Type) (cty.Value, error) {
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return is.AttrsAsObjectValue(ty)
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}
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