legacy provider needs to handle StateUpgraders
In order to not require state migrations to be supported in both MigrateState and StateUpgraders, the legacy provider codepath needs to handle the StateUpgraders transparently during Refresh.
This commit is contained in:
James Bardin
Martin Atkins
parent
dcaf5aa262
commit
b88410984b
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@ -4,17 +4,11 @@ import (
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"testing"
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"github.com/google/go-cmp/cmp"
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"github.com/google/go-cmp/cmp/cmpopts"
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"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/terraform/configs/configschema"
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)
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var (
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equateEmpty = cmpopts.EquateEmpty()
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typeComparer = cmp.Comparer(cty.Type.Equals)
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)
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// add the implicit "id" attribute for test resources
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func testResource(block *configschema.Block) *configschema.Block {
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if block.Attributes == nil {
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@ -340,6 +340,59 @@ func (r *Resource) ReadDataApply(
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return r.recordCurrentSchemaVersion(state), err
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}
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// RefreshWithoutUpgrade reads the instance state, but does not call
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// MigrateState or the StateUpgraders, since those are now invoked in a
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// separate API call.
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// RefreshWithoutUpgrade is part of the new plugin shims.
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func (r *Resource) RefreshWithoutUpgrade(
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s *terraform.InstanceState,
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meta interface{}) (*terraform.InstanceState, error) {
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// If the ID is already somehow blank, it doesn't exist
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if s.ID == "" {
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return nil, nil
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}
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rt := ResourceTimeout{}
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if _, ok := s.Meta[TimeoutKey]; ok {
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if err := rt.StateDecode(s); err != nil {
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log.Printf("[ERR] Error decoding ResourceTimeout: %s", err)
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}
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}
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if r.Exists != nil {
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// Make a copy of data so that if it is modified it doesn't
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// affect our Read later.
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data, err := schemaMap(r.Schema).Data(s, nil)
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data.timeouts = &rt
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if err != nil {
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return s, err
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}
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exists, err := r.Exists(data, meta)
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if err != nil {
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return s, err
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}
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if !exists {
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return nil, nil
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}
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}
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data, err := schemaMap(r.Schema).Data(s, nil)
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data.timeouts = &rt
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if err != nil {
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return s, err
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}
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err = r.Read(data, meta)
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state := data.State()
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if state != nil && state.ID == "" {
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state = nil
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}
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return r.recordCurrentSchemaVersion(state), err
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}
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// Refresh refreshes the state of the resource.
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func (r *Resource) Refresh(
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s *terraform.InstanceState,
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@ -375,12 +428,10 @@ func (r *Resource) Refresh(
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}
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}
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needsMigration, stateSchemaVersion := r.checkSchemaVersion(s)
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if needsMigration && r.MigrateState != nil {
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s, err := r.MigrateState(stateSchemaVersion, s, meta)
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if err != nil {
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return s, err
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}
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// there may be new StateUpgraders that need to be run
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s, err := r.upgradeState(s, meta)
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if err != nil {
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return s, err
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}
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data, err := schemaMap(r.Schema).Data(s, nil)
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@ -398,6 +449,72 @@ func (r *Resource) Refresh(
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return r.recordCurrentSchemaVersion(state), err
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}
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func (r *Resource) upgradeState(s *terraform.InstanceState, meta interface{}) (*terraform.InstanceState, error) {
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var err error
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needsMigration, stateSchemaVersion := r.checkSchemaVersion(s)
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migrate := needsMigration && r.MigrateState != nil
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if migrate {
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s, err = r.MigrateState(stateSchemaVersion, s, meta)
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if err != nil {
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return s, err
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}
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}
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if len(r.StateUpgraders) == 0 {
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return s, nil
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}
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// If we ran MigrateState, then the stateSchemaVersion value is no longer
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// correct. We can expect the first upgrade function to be the correct
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// schema type version.
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if migrate {
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stateSchemaVersion = r.StateUpgraders[0].Version
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}
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schemaType := r.CoreConfigSchema().ImpliedType()
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// find the expected type to convert the state
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for _, upgrader := range r.StateUpgraders {
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if stateSchemaVersion == upgrader.Version {
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schemaType = upgrader.Type
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}
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}
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// StateUpgraders only operate on the new JSON format state, so the state
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// need to be converted.
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stateVal, err := StateValueFromInstanceState(s, schemaType)
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if err != nil {
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return nil, err
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}
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jsonState, err := StateValueToJSONMap(stateVal, schemaType)
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if err != nil {
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return nil, err
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}
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for _, upgrader := range r.StateUpgraders {
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if stateSchemaVersion != upgrader.Version {
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continue
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}
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jsonState, err = upgrader.Upgrade(jsonState, meta)
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if err != nil {
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return nil, err
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}
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stateSchemaVersion++
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}
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// now we need to re-flatmap the new state
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stateVal, err = JSONMapToStateValue(jsonState, r.CoreConfigSchema())
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if err != nil {
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return nil, err
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}
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s = InstanceStateFromStateValue(stateVal, r.SchemaVersion)
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return s, nil
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}
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// InternalValidate should be called to validate the structure
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// of the resource.
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//
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@ -603,7 +720,15 @@ func (r *Resource) checkSchemaVersion(is *terraform.InstanceState) (bool, int) {
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}
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stateSchemaVersion, _ := strconv.Atoi(rawString)
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return stateSchemaVersion < r.SchemaVersion, stateSchemaVersion
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// Don't run MigrateState if the version is handled by a StateUpgrader,
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// since StateMigrateFuncs are not required to handle unknown versions
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maxVersion := r.SchemaVersion
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if len(r.StateUpgraders) > 0 {
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maxVersion = r.StateUpgraders[0].Version
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}
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return stateSchemaVersion < maxVersion, stateSchemaVersion
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}
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func (r *Resource) recordCurrentSchemaVersion(
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@ -8,6 +8,7 @@ import (
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"testing"
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"time"
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"github.com/google/go-cmp/cmp"
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"github.com/hashicorp/terraform/config"
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"github.com/hashicorp/terraform/config/hcl2shim"
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"github.com/hashicorp/terraform/terraform"
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@ -1540,3 +1541,156 @@ func TestResource_ValidateUpgradeState(t *testing.T) {
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t.Fatal("StateUpgraders cannot have a version >= current SchemaVersion")
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}
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}
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// The legacy provider will need to be able to handle both types of schema
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// transformations, which has been retrofitted into the Refresh method.
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func TestResource_migrateAndUpgrade(t *testing.T) {
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r := &Resource{
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SchemaVersion: 4,
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Schema: map[string]*Schema{
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"four": {
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Type: TypeInt,
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Required: true,
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},
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},
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// this MigrateState will take the state to version 2
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MigrateState: func(v int, is *terraform.InstanceState, _ interface{}) (*terraform.InstanceState, error) {
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switch v {
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case 0:
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_, ok := is.Attributes["zero"]
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if !ok {
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return nil, fmt.Errorf("zero not found in %#v", is.Attributes)
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}
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is.Attributes["one"] = "1"
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delete(is.Attributes, "zero")
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fallthrough
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case 1:
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_, ok := is.Attributes["one"]
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if !ok {
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return nil, fmt.Errorf("one not found in %#v", is.Attributes)
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}
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is.Attributes["two"] = "2"
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delete(is.Attributes, "one")
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default:
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return nil, fmt.Errorf("invalid schema version %d", v)
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}
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return is, nil
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},
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}
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r.Read = func(d *ResourceData, m interface{}) error {
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return d.Set("four", 4)
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}
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r.StateUpgraders = []StateUpgrader{
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{
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Version: 2,
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Type: cty.Object(map[string]cty.Type{
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"id": cty.String,
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"two": cty.Number,
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}),
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Upgrade: func(m map[string]interface{}, meta interface{}) (map[string]interface{}, error) {
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_, ok := m["two"].(float64)
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if !ok {
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return nil, fmt.Errorf("two not found in %#v", m)
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}
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m["three"] = float64(3)
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delete(m, "two")
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return m, nil
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},
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},
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{
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Version: 3,
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Type: cty.Object(map[string]cty.Type{
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"id": cty.String,
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"three": cty.Number,
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}),
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Upgrade: func(m map[string]interface{}, meta interface{}) (map[string]interface{}, error) {
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_, ok := m["three"].(float64)
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if !ok {
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return nil, fmt.Errorf("three not found in %#v", m)
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}
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m["four"] = float64(4)
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delete(m, "three")
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return m, nil
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},
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},
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}
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testStates := []*terraform.InstanceState{
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{
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ID: "bar",
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Attributes: map[string]string{
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"id": "bar",
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"zero": "0",
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},
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Meta: map[string]interface{}{
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"schema_version": "0",
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},
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},
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{
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ID: "bar",
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Attributes: map[string]string{
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"id": "bar",
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"one": "1",
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},
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Meta: map[string]interface{}{
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"schema_version": "1",
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},
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},
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{
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ID: "bar",
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Attributes: map[string]string{
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"id": "bar",
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"two": "2",
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},
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Meta: map[string]interface{}{
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"schema_version": "2",
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},
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},
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{
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ID: "bar",
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Attributes: map[string]string{
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"id": "bar",
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"three": "3",
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},
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Meta: map[string]interface{}{
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"schema_version": "3",
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},
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},
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{
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ID: "bar",
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Attributes: map[string]string{
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"id": "bar",
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"four": "4",
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},
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Meta: map[string]interface{}{
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"schema_version": "4",
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},
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},
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}
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for i, s := range testStates {
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t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
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newState, err := r.Refresh(s, nil)
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if err != nil {
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t.Fatal(err)
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}
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expected := &terraform.InstanceState{
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ID: "bar",
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Attributes: map[string]string{
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"id": "bar",
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"four": "4",
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},
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Meta: map[string]interface{}{
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"schema_version": "4",
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},
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}
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if !cmp.Equal(expected, newState, equateEmpty) {
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t.Fatal(cmp.Diff(expected, newState, equateEmpty))
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}
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})
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}
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}
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