Add versioned Beta support to google_compute_instance_group_manager (h…

…ashicorp#234)

* Vendor GCP Compute Beta client library.

* Refactor resource_compute_instance_group_manager for multi version support (hashicorp#129)

* Refactor resource_compute_instance_group_manager for multi version support.
* Minor changes based on review.
* Removed type-specific API version conversion functions.

* Add support for Beta operations.

* Add v0beta support to google_compute_instance_group_manager.

* Renamed Key to Feature, added comments & updated some parameter names.

* Fix code and tests for version finder to match fields that don't have a change.

* Store non-v1 resources' self links as v1 so that dependent single-version resources don't see diffs.

* Fix weird change to vendor.json from merge.

* Add a note that Convert loses ForceSendFields, fix failing test.

* Moved nil type to a switch case in compute_shared_operation.go.

* Move base api version declaration above schema.

google/api_versions.go

@@ -0,0 +1,100 @@
+package google
+
+import (
+	"encoding/json"
+)
+
+type ComputeApiVersion uint8
+
+const (
+	v1 ComputeApiVersion = iota
+	v0beta
+)
+
+var OrderedComputeApiVersions = []ComputeApiVersion{
+	v0beta,
+	v1,
+}
+
+// Convert between two types by converting to/from JSON. Intended to switch
+// between multiple API versions, as they are strict supersets of one another.
+// Convert loses information about ForceSendFields and NullFields.
+func Convert(item, out interface{}) error {
+	bytes, err := json.Marshal(item)
+	if err != nil {
+		return err
+	}
+
+	err = json.Unmarshal(bytes, out)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+type TerraformResourceData interface {
+	HasChange(string) bool
+	GetOk(string) (interface{}, bool)
+}
+
+// Compare the fields set in schema against a list of features and their versions to determine
+// what version of the API is required in order to manage the resource.
+func getComputeApiVersion(d TerraformResourceData, resourceVersion ComputeApiVersion, features []Feature) ComputeApiVersion {
+	versions := map[ComputeApiVersion]struct{}{resourceVersion: struct{}{}}
+	for _, feature := range features {
+		if feature.InUseBy(d) {
+			versions[feature.Version] = struct{}{}
+		}
+	}
+
+	return maxVersion(versions)
+}
+
+// Compare the fields set in schema against a list of features and their version, and a
+// list of features that exist at the base resource version that can only be update at some other
+// version, to determine what version of the API is required in order to update the resource.
+func getComputeApiVersionUpdate(d TerraformResourceData, resourceVersion ComputeApiVersion, features, updateOnlyFields []Feature) ComputeApiVersion {
+	versions := map[ComputeApiVersion]struct{}{resourceVersion: struct{}{}}
+	schemaVersion := getComputeApiVersion(d, resourceVersion, features)
+	versions[schemaVersion] = struct{}{}
+
+	for _, feature := range updateOnlyFields {
+		if feature.HasChangeBy(d) {
+			versions[feature.Version] = struct{}{}
+		}
+	}
+
+	return maxVersion(versions)
+}
+
+// A field of a resource and the version of the Compute API required to use it.
+type Feature struct {
+	Version ComputeApiVersion
+	Item    string
+}
+
+// Returns true when a feature has been modified.
+// This is most important when updating a resource to remove versioned feature usage; if the
+// resource is reverting to its base version, it needs to perform a final update at the higher
+// version in order to remove high version features.
+func (s Feature) HasChangeBy(d TerraformResourceData) bool {
+	return d.HasChange(s.Item)
+}
+
+// Return true when a feature appears in schema or has been modified.
+func (s Feature) InUseBy(d TerraformResourceData) bool {
+	_, ok := d.GetOk(s.Item)
+	return ok || s.HasChangeBy(d)
+}
+
+func maxVersion(versionsInUse map[ComputeApiVersion]struct{}) ComputeApiVersion {
+	for _, version := range OrderedComputeApiVersions {
+		if _, ok := versionsInUse[version]; ok {
+			return version
+		}
+	}
+
+	// Fallback to the final, most stable version
+	return OrderedComputeApiVersions[len(OrderedComputeApiVersions)-1]
+}

google/api_versions_test.go

@@ -0,0 +1,105 @@
+package google
+
+import "testing"
+
+func TestResourceWithOnlyBaseVersionFields(t *testing.T) {
+	d := &ResourceDataMock{
+		FieldsInSchema: []string{"normal_field"},
+	}
+
+	resourceVersion := v1
+	computeApiVersion := getComputeApiVersion(d, resourceVersion, []Feature{})
+	if computeApiVersion != resourceVersion {
+		t.Errorf("Expected to see version: %v. Saw version: %v.", resourceVersion, computeApiVersion)
+	}
+
+	computeApiVersion = getComputeApiVersionUpdate(d, resourceVersion, []Feature{}, []Feature{})
+	if computeApiVersion != resourceVersion {
+		t.Errorf("Expected to see version: %v. Saw version: %v.", resourceVersion, computeApiVersion)
+	}
+}
+
+func TestResourceWithBetaFields(t *testing.T) {
+	resourceVersion := v1
+	d := &ResourceDataMock{
+		FieldsInSchema: []string{"normal_field", "beta_field"},
+	}
+
+	expectedVersion := v0beta
+	computeApiVersion := getComputeApiVersion(d, resourceVersion, []Feature{{Version: expectedVersion, Item: "beta_field"}})
+	if computeApiVersion != expectedVersion {
+		t.Errorf("Expected to see version: %v. Saw version: %v.", expectedVersion, computeApiVersion)
+	}
+
+	computeApiVersion = getComputeApiVersionUpdate(d, resourceVersion, []Feature{{Version: expectedVersion, Item: "beta_field"}}, []Feature{})
+	if computeApiVersion != expectedVersion {
+		t.Errorf("Expected to see version: %v. Saw version: %v.", expectedVersion, computeApiVersion)
+	}
+}
+
+func TestResourceWithBetaFieldsNotInSchema(t *testing.T) {
+	resourceVersion := v1
+	d := &ResourceDataMock{
+		FieldsInSchema: []string{"normal_field"},
+	}
+
+	expectedVersion := v1
+	computeApiVersion := getComputeApiVersion(d, resourceVersion, []Feature{{Version: expectedVersion, Item: "beta_field"}})
+	if computeApiVersion != expectedVersion {
+		t.Errorf("Expected to see version: %v. Saw version: %v.", expectedVersion, computeApiVersion)
+	}
+
+	computeApiVersion = getComputeApiVersionUpdate(d, resourceVersion, []Feature{{Version: expectedVersion, Item: "beta_field"}}, []Feature{})
+	if computeApiVersion != expectedVersion {
+		t.Errorf("Expected to see version: %v. Saw version: %v.", expectedVersion, computeApiVersion)
+	}
+}
+
+func TestResourceWithBetaUpdateFields(t *testing.T) {
+	resourceVersion := v1
+	d := &ResourceDataMock{
+		FieldsInSchema:      []string{"normal_field", "beta_update_field"},
+		FieldsWithHasChange: []string{"beta_update_field"},
+	}
+
+	expectedVersion := v1
+	computeApiVersion := getComputeApiVersion(d, resourceVersion, []Feature{})
+	if computeApiVersion != expectedVersion {
+		t.Errorf("Expected to see version: %v. Saw version: %v.", expectedVersion, computeApiVersion)
+	}
+
+	expectedVersion = v0beta
+	computeApiVersion = getComputeApiVersionUpdate(d, resourceVersion, []Feature{}, []Feature{{Version: expectedVersion, Item: "beta_update_field"}})
+	if computeApiVersion != expectedVersion {
+		t.Errorf("Expected to see version: %v. Saw version: %v.", expectedVersion, computeApiVersion)
+	}
+
+}
+
+type ResourceDataMock struct {
+	FieldsInSchema      []string
+	FieldsWithHasChange []string
+}
+
+func (d *ResourceDataMock) HasChange(key string) bool {
+	exists := false
+	for _, val := range d.FieldsWithHasChange {
+		if key == val {
+			exists = true
+		}
+	}
+
+	return exists
+}
+
+func (d *ResourceDataMock) GetOk(key string) (interface{}, bool) {
+	exists := false
+	for _, val := range d.FieldsInSchema {
+		if key == val {
+			exists = true
+		}
+
+	}
+
+	return nil, exists
+}

google/compute_beta_operation.go

@@ -0,0 +1,167 @@
+package google
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/hashicorp/terraform/helper/resource"
+
+	computeBeta "google.golang.org/api/compute/v0.beta"
+)
+
+// OperationBetaWaitType is an enum specifying what type of operation
+// we're waiting on from the beta API.
+type ComputeBetaOperationWaitType byte
+
+const (
+	ComputeBetaOperationWaitInvalid ComputeBetaOperationWaitType = iota
+	ComputeBetaOperationWaitGlobal
+	ComputeBetaOperationWaitRegion
+	ComputeBetaOperationWaitZone
+)
+
+type ComputeBetaOperationWaiter struct {
+	Service *computeBeta.Service
+	Op      *computeBeta.Operation
+	Project string
+	Region  string
+	Type    ComputeBetaOperationWaitType
+	Zone    string
+}
+
+func (w *ComputeBetaOperationWaiter) RefreshFunc() resource.StateRefreshFunc {
+	return func() (interface{}, string, error) {
+		var op *computeBeta.Operation
+		var err error
+
+		switch w.Type {
+		case ComputeBetaOperationWaitGlobal:
+			op, err = w.Service.GlobalOperations.Get(
+				w.Project, w.Op.Name).Do()
+		case ComputeBetaOperationWaitRegion:
+			op, err = w.Service.RegionOperations.Get(
+				w.Project, w.Region, w.Op.Name).Do()
+		case ComputeBetaOperationWaitZone:
+			op, err = w.Service.ZoneOperations.Get(
+				w.Project, w.Zone, w.Op.Name).Do()
+		default:
+			return nil, "bad-type", fmt.Errorf(
+				"Invalid wait type: %#v", w.Type)
+		}
+
+		if err != nil {
+			return nil, "", err
+		}
+
+		log.Printf("[DEBUG] Got %q when asking for operation %q", op.Status, w.Op.Name)
+
+		return op, op.Status, nil
+	}
+}
+
+func (w *ComputeBetaOperationWaiter) Conf() *resource.StateChangeConf {
+	return &resource.StateChangeConf{
+		Pending: []string{"PENDING", "RUNNING"},
+		Target:  []string{"DONE"},
+		Refresh: w.RefreshFunc(),
+	}
+}
+
+// ComputeBetaOperationError wraps computeBeta.OperationError and implements the
+// error interface so it can be returned.
+type ComputeBetaOperationError computeBeta.OperationError
+
+func (e ComputeBetaOperationError) Error() string {
+	var buf bytes.Buffer
+
+	for _, err := range e.Errors {
+		buf.WriteString(err.Message + "\n")
+	}
+
+	return buf.String()
+}
+
+func computeBetaOperationWaitGlobal(config *Config, op *computeBeta.Operation, project string, activity string) error {
+	return computeBetaOperationWaitGlobalTime(config, op, project, activity, 4)
+}
+
+func computeBetaOperationWaitGlobalTime(config *Config, op *computeBeta.Operation, project string, activity string, timeoutMin int) error {
+	w := &ComputeBetaOperationWaiter{
+		Service: config.clientComputeBeta,
+		Op:      op,
+		Project: project,
+		Type:    ComputeBetaOperationWaitGlobal,
+	}
+
+	state := w.Conf()
+	state.Delay = 10 * time.Second
+	state.Timeout = time.Duration(timeoutMin) * time.Minute
+	state.MinTimeout = 2 * time.Second
+	opRaw, err := state.WaitForState()
+	if err != nil {
+		return fmt.Errorf("Error waiting for %s: %s", activity, err)
+	}
+
+	op = opRaw.(*computeBeta.Operation)
+	if op.Error != nil {
+		return ComputeBetaOperationError(*op.Error)
+	}
+
+	return nil
+}
+
+func computeBetaOperationWaitRegion(config *Config, op *computeBeta.Operation, project string, region, activity string) error {
+	w := &ComputeBetaOperationWaiter{
+		Service: config.clientComputeBeta,
+		Op:      op,
+		Project: project,
+		Type:    ComputeBetaOperationWaitRegion,
+		Region:  region,
+	}
+
+	state := w.Conf()
+	state.Delay = 10 * time.Second
+	state.Timeout = 4 * time.Minute
+	state.MinTimeout = 2 * time.Second
+	opRaw, err := state.WaitForState()
+	if err != nil {
+		return fmt.Errorf("Error waiting for %s: %s", activity, err)
+	}
+
+	op = opRaw.(*computeBeta.Operation)
+	if op.Error != nil {
+		return ComputeBetaOperationError(*op.Error)
+	}
+
+	return nil
+}
+
+func computeBetaOperationWaitZone(config *Config, op *computeBeta.Operation, project string, zone, activity string) error {
+	return computeBetaOperationWaitZoneTime(config, op, project, zone, 4, activity)
+}
+
+func computeBetaOperationWaitZoneTime(config *Config, op *computeBeta.Operation, project string, zone string, minutes int, activity string) error {
+	w := &ComputeBetaOperationWaiter{
+		Service: config.clientComputeBeta,
+		Op:      op,
+		Project: project,
+		Zone:    zone,
+		Type:    ComputeBetaOperationWaitZone,
+	}
+	state := w.Conf()
+	state.Delay = 10 * time.Second
+	state.Timeout = time.Duration(minutes) * time.Minute
+	state.MinTimeout = 2 * time.Second
+	opRaw, err := state.WaitForState()
+	if err != nil {
+		return fmt.Errorf("Error waiting for %s: %s", activity, err)
+	}
+	op = opRaw.(*computeBeta.Operation)
+	if op.Error != nil {
+		// Return the error
+		return ComputeBetaOperationError(*op.Error)
+	}
+	return nil
+}

google/compute_shared_operation.go

@@ -0,0 +1,23 @@
+package google
+
+import (
+	computeBeta "google.golang.org/api/compute/v0.beta"
+	"google.golang.org/api/compute/v1"
+)
+
+func computeSharedOperationWaitZone(config *Config, op interface{}, project string, zone, activity string) error {
+	return computeSharedOperationWaitZoneTime(config, op, project, zone, 4, activity)
+}
+
+func computeSharedOperationWaitZoneTime(config *Config, op interface{}, project string, zone string, minutes int, activity string) error {
+	switch op.(type) {
+	case *compute.Operation:
+		return computeOperationWaitZoneTime(config, op.(*compute.Operation), project, zone, minutes, activity)
+	case *computeBeta.Operation:
+		return computeBetaOperationWaitZoneTime(config, op.(*computeBeta.Operation), project, zone, minutes, activity)
+	case nil:
+		panic("Attempted to wait on an Operation that was nil.")
+	default:
+		panic("Attempted to wait on an Operation of unknown type.")
+	}
+}