forked from hashicorp/terraform-provider-aws
/
resource_aws_elasticache_parameter_group.go
347 lines (291 loc) · 10.6 KB
/
resource_aws_elasticache_parameter_group.go
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package aws
import (
"bytes"
"fmt"
"log"
"strings"
"time"
"github.com/hashicorp/terraform/helper/hashcode"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/helper/schema"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/elasticache"
)
func resourceAwsElasticacheParameterGroup() *schema.Resource {
return &schema.Resource{
Create: resourceAwsElasticacheParameterGroupCreate,
Read: resourceAwsElasticacheParameterGroupRead,
Update: resourceAwsElasticacheParameterGroupUpdate,
Delete: resourceAwsElasticacheParameterGroupDelete,
Importer: &schema.ResourceImporter{
State: schema.ImportStatePassthrough,
},
Schema: map[string]*schema.Schema{
"name": {
Type: schema.TypeString,
ForceNew: true,
Required: true,
StateFunc: func(val interface{}) string {
return strings.ToLower(val.(string))
},
},
"family": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"description": {
Type: schema.TypeString,
Optional: true,
ForceNew: true,
Default: "Managed by Terraform",
},
"parameter": {
Type: schema.TypeSet,
Optional: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"name": {
Type: schema.TypeString,
Required: true,
},
"value": {
Type: schema.TypeString,
Required: true,
},
},
},
Set: resourceAwsElasticacheParameterHash,
},
},
}
}
func resourceAwsElasticacheParameterGroupCreate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).elasticacheconn
createOpts := elasticache.CreateCacheParameterGroupInput{
CacheParameterGroupName: aws.String(d.Get("name").(string)),
CacheParameterGroupFamily: aws.String(d.Get("family").(string)),
Description: aws.String(d.Get("description").(string)),
}
log.Printf("[DEBUG] Create Cache Parameter Group: %#v", createOpts)
resp, err := conn.CreateCacheParameterGroup(&createOpts)
if err != nil {
return fmt.Errorf("Error creating Cache Parameter Group: %s", err)
}
d.Partial(true)
d.SetPartial("name")
d.SetPartial("family")
d.SetPartial("description")
d.Partial(false)
d.SetId(*resp.CacheParameterGroup.CacheParameterGroupName)
log.Printf("[INFO] Cache Parameter Group ID: %s", d.Id())
return resourceAwsElasticacheParameterGroupUpdate(d, meta)
}
func resourceAwsElasticacheParameterGroupRead(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).elasticacheconn
describeOpts := elasticache.DescribeCacheParameterGroupsInput{
CacheParameterGroupName: aws.String(d.Id()),
}
describeResp, err := conn.DescribeCacheParameterGroups(&describeOpts)
if err != nil {
return err
}
if len(describeResp.CacheParameterGroups) != 1 ||
*describeResp.CacheParameterGroups[0].CacheParameterGroupName != d.Id() {
return fmt.Errorf("Unable to find Parameter Group: %#v", describeResp.CacheParameterGroups)
}
d.Set("name", describeResp.CacheParameterGroups[0].CacheParameterGroupName)
d.Set("family", describeResp.CacheParameterGroups[0].CacheParameterGroupFamily)
d.Set("description", describeResp.CacheParameterGroups[0].Description)
// Only include user customized parameters as there's hundreds of system/default ones
describeParametersOpts := elasticache.DescribeCacheParametersInput{
CacheParameterGroupName: aws.String(d.Id()),
Source: aws.String("user"),
}
describeParametersResp, err := conn.DescribeCacheParameters(&describeParametersOpts)
if err != nil {
return err
}
d.Set("parameter", flattenElastiCacheParameters(describeParametersResp.Parameters))
return nil
}
func resourceAwsElasticacheParameterGroupUpdate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).elasticacheconn
d.Partial(true)
if d.HasChange("parameter") {
o, n := d.GetChange("parameter")
if o == nil {
o = new(schema.Set)
}
if n == nil {
n = new(schema.Set)
}
os := o.(*schema.Set)
ns := n.(*schema.Set)
toRemove, err := expandElastiCacheParameters(os.Difference(ns).List())
if err != nil {
return err
}
log.Printf("[DEBUG] Parameters to remove: %#v", toRemove)
toAdd, err := expandElastiCacheParameters(ns.Difference(os).List())
if err != nil {
return err
}
log.Printf("[DEBUG] Parameters to add: %#v", toAdd)
// We can only modify 20 parameters at a time, so walk them until
// we've got them all.
maxParams := 20
for len(toRemove) > 0 {
var paramsToModify []*elasticache.ParameterNameValue
if len(toRemove) <= maxParams {
paramsToModify, toRemove = toRemove[:], nil
} else {
paramsToModify, toRemove = toRemove[:maxParams], toRemove[maxParams:]
}
resetOpts := elasticache.ResetCacheParameterGroupInput{
CacheParameterGroupName: aws.String(d.Get("name").(string)),
ParameterNameValues: paramsToModify,
}
log.Printf("[DEBUG] Reset Cache Parameter Group: %s", resetOpts)
err := resource.Retry(30*time.Second, func() *resource.RetryError {
_, err = conn.ResetCacheParameterGroup(&resetOpts)
if err != nil {
if isAWSErr(err, "InvalidCacheParameterGroupState", " has pending changes") {
return resource.RetryableError(err)
}
return resource.NonRetryableError(err)
}
return nil
})
// When attempting to reset the reserved-memory parameter, the API
// can return the below 500 error, which causes the AWS Go SDK to
// automatically retry and hence timeout resource.Retry():
// InternalFailure: An internal error has occurred. Please try your query again at a later time.
// Instead of hardcoding the reserved-memory parameter removal
// above, which may become out of date, here we add logic to
// workaround this API behavior
if isResourceTimeoutError(err) {
for i, paramToModify := range paramsToModify {
if aws.StringValue(paramToModify.ParameterName) != "reserved-memory" {
continue
}
// Always reset the top level error and remove the reset for reserved-memory
err = nil
paramsToModify = append(paramsToModify[:i], paramsToModify[i+1:]...)
// If we are only trying to remove reserved-memory and not perform
// an update to reserved-memory or reserved-memory-percentage, we
// can attempt to workaround the API issue by switching it to
// reserved-memory-percentage first then reset that temporary parameter.
tryReservedMemoryPercentageWorkaround := true
allConfiguredParameters, err := expandElastiCacheParameters(d.Get("parameter").(*schema.Set).List())
if err != nil {
return fmt.Errorf("error expanding parameter configuration: %s", err)
}
for _, configuredParameter := range allConfiguredParameters {
if aws.StringValue(configuredParameter.ParameterName) == "reserved-memory" || aws.StringValue(configuredParameter.ParameterName) == "reserved-memory-percentage" {
tryReservedMemoryPercentageWorkaround = false
break
}
}
if !tryReservedMemoryPercentageWorkaround {
break
}
// The reserved-memory-percentage parameter does not exist in redis2.6 and redis2.8
family := d.Get("family").(string)
if family == "redis2.6" || family == "redis2.8" {
log.Printf("[WARN] Cannot reset Elasticache Parameter Group (%s) reserved-memory parameter with %s family", d.Id(), family)
break
}
modifyInput := &elasticache.ModifyCacheParameterGroupInput{
CacheParameterGroupName: aws.String(d.Get("name").(string)),
ParameterNameValues: []*elasticache.ParameterNameValue{
{
ParameterName: aws.String("reserved-memory-percentage"),
ParameterValue: aws.String("0"),
},
},
}
_, err = conn.ModifyCacheParameterGroup(modifyInput)
if err != nil {
log.Printf("[WARN] Error attempting reserved-memory workaround to switch to reserved-memory-percentage: %s", err)
break
}
resetInput := &elasticache.ResetCacheParameterGroupInput{
CacheParameterGroupName: aws.String(d.Get("name").(string)),
ParameterNameValues: []*elasticache.ParameterNameValue{
{
ParameterName: aws.String("reserved-memory-percentage"),
ParameterValue: aws.String("0"),
},
},
}
_, err = conn.ResetCacheParameterGroup(resetInput)
if err != nil {
log.Printf("[WARN] Error attempting reserved-memory workaround to reset reserved-memory-percentage: %s", err)
}
break
}
// Retry any remaining parameter resets with reserved-memory potentially removed
if len(paramsToModify) > 0 {
resetOpts = elasticache.ResetCacheParameterGroupInput{
CacheParameterGroupName: aws.String(d.Get("name").(string)),
ParameterNameValues: paramsToModify,
}
// Reset top level error with potentially any new errors
_, err = conn.ResetCacheParameterGroup(&resetOpts)
}
}
if err != nil {
return fmt.Errorf("Error resetting Cache Parameter Group: %s", err)
}
}
for len(toAdd) > 0 {
var paramsToModify []*elasticache.ParameterNameValue
if len(toAdd) <= maxParams {
paramsToModify, toAdd = toAdd[:], nil
} else {
paramsToModify, toAdd = toAdd[:maxParams], toAdd[maxParams:]
}
modifyOpts := elasticache.ModifyCacheParameterGroupInput{
CacheParameterGroupName: aws.String(d.Get("name").(string)),
ParameterNameValues: paramsToModify,
}
log.Printf("[DEBUG] Modify Cache Parameter Group: %s", modifyOpts)
_, err = conn.ModifyCacheParameterGroup(&modifyOpts)
if err != nil {
return fmt.Errorf("Error modifying Cache Parameter Group: %s", err)
}
}
d.SetPartial("parameter")
}
d.Partial(false)
return resourceAwsElasticacheParameterGroupRead(d, meta)
}
func resourceAwsElasticacheParameterGroupDelete(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).elasticacheconn
return resource.Retry(3*time.Minute, func() *resource.RetryError {
deleteOpts := elasticache.DeleteCacheParameterGroupInput{
CacheParameterGroupName: aws.String(d.Id()),
}
_, err := conn.DeleteCacheParameterGroup(&deleteOpts)
if err != nil {
awsErr, ok := err.(awserr.Error)
if ok && awsErr.Code() == "CacheParameterGroupNotFoundFault" {
return nil
}
if ok && awsErr.Code() == "InvalidCacheParameterGroupState" {
return resource.RetryableError(err)
}
return resource.NonRetryableError(err)
}
return nil
})
}
func resourceAwsElasticacheParameterHash(v interface{}) int {
var buf bytes.Buffer
m := v.(map[string]interface{})
buf.WriteString(fmt.Sprintf("%s-", m["name"].(string)))
buf.WriteString(fmt.Sprintf("%s-", m["value"].(string)))
return hashcode.String(buf.String())
}