mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-09-07 09:36:44 +00:00
138 lines
3.9 KiB
Go
138 lines
3.9 KiB
Go
package google
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import (
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"encoding/json"
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"fmt"
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"strings"
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)
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type ComputeApiVersion uint8
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const (
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v1 ComputeApiVersion = iota
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v0beta
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)
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var OrderedComputeApiVersions = []ComputeApiVersion{
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v0beta,
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v1,
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}
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// Convert between two types by converting to/from JSON. Intended to switch
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// between multiple API versions, as they are strict supersets of one another.
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// Convert loses information about ForceSendFields and NullFields.
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func Convert(item, out interface{}) error {
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bytes, err := json.Marshal(item)
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if err != nil {
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return err
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}
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err = json.Unmarshal(bytes, out)
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if err != nil {
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return err
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}
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return nil
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}
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type TerraformResourceData interface {
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HasChange(string) bool
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GetOk(string) (interface{}, bool)
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}
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// Compare the fields set in schema against a list of features and their versions to determine
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// what version of the API is required in order to manage the resource.
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func getComputeApiVersion(d TerraformResourceData, resourceVersion ComputeApiVersion, features []Feature) ComputeApiVersion {
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versions := map[ComputeApiVersion]struct{}{resourceVersion: struct{}{}}
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for _, feature := range features {
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if feature.InUseBy(d) {
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versions[feature.Version] = struct{}{}
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}
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}
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return maxVersion(versions)
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}
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// Compare the fields set in schema against a list of features and their version, and a
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// list of features that exist at the base resource version that can only be update at some other
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// version, to determine what version of the API is required in order to update the resource.
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func getComputeApiVersionUpdate(d TerraformResourceData, resourceVersion ComputeApiVersion, features, updateOnlyFields []Feature) ComputeApiVersion {
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versions := map[ComputeApiVersion]struct{}{resourceVersion: struct{}{}}
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schemaVersion := getComputeApiVersion(d, resourceVersion, features)
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versions[schemaVersion] = struct{}{}
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for _, feature := range updateOnlyFields {
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if feature.HasChangeBy(d) {
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versions[feature.Version] = struct{}{}
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}
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}
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return maxVersion(versions)
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}
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// A field of a resource and the version of the Compute API required to use it.
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type Feature struct {
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Version ComputeApiVersion
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// Path to the beta field.
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//
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// The feature is considered to be in-use if the field referenced by "Item" is set in the state.
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// The path can reference:
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// - a beta field at the top-level (e.g. "min_cpu_platform").
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// - a beta field nested inside a list (e.g. "network_interface.*.alias_ip_range" is considered to be
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// in-use if the "alias_ip_range" field is set in the state for any of the network interfaces).
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//
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// Note: beta field nested inside a SET are NOT supported at the moment.
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Item string
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}
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// Returns true when a feature has been modified.
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// This is most important when updating a resource to remove versioned feature usage; if the
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// resource is reverting to its base version, it needs to perform a final update at the higher
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// version in order to remove high version features.
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func (s Feature) HasChangeBy(d TerraformResourceData) bool {
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return d.HasChange(s.Item)
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}
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// Return true when a feature appears in schema or has been modified.
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func (s Feature) InUseBy(d TerraformResourceData) bool {
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return inUseBy(d, s.Item)
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}
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func inUseBy(d TerraformResourceData, path string) bool {
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pos := strings.Index(path, "*")
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if pos == -1 {
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_, ok := d.GetOk(path)
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return ok || d.HasChange(path)
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}
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prefix := path[0:pos]
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suffix := path[pos+1:]
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v, ok := d.GetOk(prefix + "#")
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if !ok {
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return false
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}
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count := v.(int)
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for i := 0; i < count; i++ {
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nestedPath := fmt.Sprintf("%s%d%s", prefix, i, suffix)
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if inUseBy(d, nestedPath) {
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return true
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}
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}
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return false
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}
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func maxVersion(versionsInUse map[ComputeApiVersion]struct{}) ComputeApiVersion {
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for _, version := range OrderedComputeApiVersions {
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if _, ok := versionsInUse[version]; ok {
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return version
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}
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}
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// Fallback to the final, most stable version
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return OrderedComputeApiVersions[len(OrderedComputeApiVersions)-1]
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}
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