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resource_compute_backend_service_migrate.go
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resource_compute_backend_service_migrate.go
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package google
import (
"fmt"
"log"
"strconv"
"strings"
"bytes"
"github.com/hashicorp/terraform/helper/hashcode"
"github.com/hashicorp/terraform/terraform"
)
func resourceComputeBackendServiceMigrateState(
v int, is *terraform.InstanceState, meta interface{}) (*terraform.InstanceState, error) {
if is.Empty() {
log.Println("[DEBUG] Empty InstanceState; nothing to migrate.")
return is, nil
}
switch v {
case 0:
log.Println("[INFO] Found Compute Backend Service State v0; migrating to v1")
is, err := migrateBackendServiceStateV0toV1(is)
if err != nil {
return is, err
}
return is, nil
default:
return is, fmt.Errorf("Unexpected schema version: %d", v)
}
}
func migrateBackendServiceStateV0toV1(is *terraform.InstanceState) (*terraform.InstanceState, error) {
log.Printf("[DEBUG] Attributes before migration: %#v", is.Attributes)
oldHashToValue := map[string]map[string]interface{}{}
for k, v := range is.Attributes {
if !strings.HasPrefix(k, "backend.") || k == "backend.#" {
continue
}
// Key is now of the form backend.%d.%s
kParts := strings.Split(k, ".")
// Sanity check: two parts should be there and <N> should be a number
badFormat := false
if len(kParts) != 3 {
badFormat = true
} else if _, err := strconv.Atoi(kParts[1]); err != nil {
badFormat = true
}
if badFormat {
return is, fmt.Errorf("migration error: found backend key in unexpected format: %s", k)
}
if oldHashToValue[kParts[1]] == nil {
oldHashToValue[kParts[1]] = map[string]interface{}{}
}
oldHashToValue[kParts[1]][kParts[2]] = v
}
oldHashToNewHash := map[string]int{}
for k, v := range oldHashToValue {
oldHashToNewHash[k] = resourceGoogleComputeBackendServiceBackendHash(v)
}
values := map[string]string{}
for k, v := range is.Attributes {
if !strings.HasPrefix(k, "backend.") {
continue
}
if k == "backend.#" {
continue
}
// Key is now of the form backend.%d.%s
kParts := strings.Split(k, ".")
newKey := fmt.Sprintf("%s.%d.%s", kParts[0], oldHashToNewHash[kParts[1]], kParts[2])
values[newKey] = v
delete(is.Attributes, k)
}
for k, v := range values {
is.Attributes[k] = v
}
log.Printf("[DEBUG] Attributes after migration: %#v", is.Attributes)
return is, nil
}
func resourceGoogleComputeBackendServiceBackendHash(v interface{}) int {
if v == nil {
return 0
}
var buf bytes.Buffer
m := v.(map[string]interface{})
group, _ := getRelativePath(m["group"].(string))
buf.WriteString(fmt.Sprintf("%s-", group))
if v, ok := m["balancing_mode"]; ok {
buf.WriteString(fmt.Sprintf("%s-", v.(string)))
}
if v, ok := m["capacity_scaler"]; ok {
buf.WriteString(fmt.Sprintf("%f-", v.(float64)))
}
if v, ok := m["description"]; ok {
buf.WriteString(fmt.Sprintf("%s-", v.(string)))
}
if v, ok := m["max_rate"]; ok {
buf.WriteString(fmt.Sprintf("%d-", int64(v.(int))))
}
if v, ok := m["max_rate_per_instance"]; ok {
buf.WriteString(fmt.Sprintf("%f-", v.(float64)))
}
if v, ok := m["max_rate_per_instance"]; ok {
buf.WriteString(fmt.Sprintf("%f-", v.(float64)))
}
return hashcode.String(buf.String())
}