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metadata.go
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metadata.go
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package google
import (
"errors"
"fmt"
"strings"
"github.com/hashicorp/terraform/helper/schema"
computeBeta "google.golang.org/api/compute/v0.beta"
"google.golang.org/api/compute/v1"
)
const FINGERPRINT_RETRIES = 10
var FINGERPRINT_FAIL_ERRORS = []string{"Invalid fingerprint.", "Supplied fingerprint does not match current metadata fingerprint."}
// Since the google compute API uses optimistic locking, there is a chance
// we need to resubmit our updated metadata. To do this, you need to provide
// an update function that attempts to submit your metadata
func MetadataRetryWrapper(update func() error) error {
attempt := 0
for attempt < FINGERPRINT_RETRIES {
err := update()
if err == nil {
return nil
}
// Check to see if the error matches any of our fingerprint-related failure messages
var fingerprintError bool
for _, msg := range FINGERPRINT_FAIL_ERRORS {
if strings.Contains(err.Error(), msg) {
fingerprintError = true
break
}
}
if !fingerprintError {
// Something else went wrong, don't retry
return err
}
attempt++
}
return fmt.Errorf("Failed to update metadata after %d retries", attempt)
}
// Update the metadata (serverMD) according to the provided diff (oldMDMap v
// newMDMap).
func MetadataUpdate(oldMDMap map[string]interface{}, newMDMap map[string]interface{}, serverMD *compute.Metadata) {
curMDMap := make(map[string]string)
// Load metadata on server into map
for _, kv := range serverMD.Items {
// If the server state has a key that we had in our old
// state, but not in our new state, we should delete it
_, okOld := oldMDMap[kv.Key]
_, okNew := newMDMap[kv.Key]
if okOld && !okNew {
continue
} else {
curMDMap[kv.Key] = *kv.Value
}
}
// Insert new metadata into existing metadata (overwriting when needed)
for key, val := range newMDMap {
curMDMap[key] = val.(string)
}
// Reformat old metadata into a list
serverMD.Items = nil
for key, val := range curMDMap {
v := val
serverMD.Items = append(serverMD.Items, &compute.MetadataItems{
Key: key,
Value: &v,
})
}
}
// Update the beta metadata (serverMD) according to the provided diff (oldMDMap v
// newMDMap).
func BetaMetadataUpdate(oldMDMap map[string]interface{}, newMDMap map[string]interface{}, serverMD *computeBeta.Metadata) {
curMDMap := make(map[string]string)
// Load metadata on server into map
for _, kv := range serverMD.Items {
// If the server state has a key that we had in our old
// state, but not in our new state, we should delete it
_, okOld := oldMDMap[kv.Key]
_, okNew := newMDMap[kv.Key]
if okOld && !okNew {
continue
} else {
curMDMap[kv.Key] = *kv.Value
}
}
// Insert new metadata into existing metadata (overwriting when needed)
for key, val := range newMDMap {
curMDMap[key] = val.(string)
}
// Reformat old metadata into a list
serverMD.Items = nil
for key, val := range curMDMap {
v := val
serverMD.Items = append(serverMD.Items, &computeBeta.MetadataItems{
Key: key,
Value: &v,
})
}
}
// expandComputeMetadata transforms a map representing computing metadata into a list of compute.MetadataItems suitable
// for the GCP client.
func expandComputeMetadata(m map[string]string) []*compute.MetadataItems {
metadata := make([]*compute.MetadataItems, len(m))
idx := 0
for key, value := range m {
// Make a copy of value as we need a ptr type; if we directly use 'value' then all items will reference the same
// memory address
vtmp := value
metadata[idx] = &compute.MetadataItems{Key: key, Value: &vtmp}
idx++
}
return metadata
}
func flattenMetadataBeta(metadata *computeBeta.Metadata) map[string]string {
metadataMap := make(map[string]string)
for _, item := range metadata.Items {
metadataMap[item.Key] = *item.Value
}
return metadataMap
}
// This function differs from flattenMetadataBeta only in that it takes
// compute.metadata rather than computeBeta.metadata as an argument. It should
// be removed in favour of flattenMetadataBeta if/when all resources using it get
// beta support.
func flattenMetadata(metadata *compute.Metadata) map[string]string {
metadataMap := make(map[string]string)
for _, item := range metadata.Items {
metadataMap[item.Key] = *item.Value
}
return metadataMap
}
func resourceInstanceMetadata(d *schema.ResourceData) (*computeBeta.Metadata, error) {
m := &computeBeta.Metadata{}
mdMap := d.Get("metadata").(map[string]interface{})
if v, ok := d.GetOk("metadata_startup_script"); ok && v.(string) != "" {
if ss, ok := mdMap["startup-script"]; ok && ss != "" {
return nil, errors.New("Cannot provide both metadata_startup_script and metadata.startup-script.")
}
mdMap["startup-script"] = v
}
if len(mdMap) > 0 {
m.Items = make([]*computeBeta.MetadataItems, 0, len(mdMap))
for key, val := range mdMap {
v := val.(string)
m.Items = append(m.Items, &computeBeta.MetadataItems{
Key: key,
Value: &v,
})
}
// Set the fingerprint. If the metadata has never been set before
// then this will just be blank.
m.Fingerprint = d.Get("metadata_fingerprint").(string)
}
return m, nil
}