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resource_alicloud_slb_attachment.go
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resource_alicloud_slb_attachment.go
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package alicloud
import (
"fmt"
"strings"
"time"
"github.com/aliyun/alibaba-cloud-sdk-go/services/slb"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/helper/schema"
"github.com/terraform-providers/terraform-provider-alicloud/alicloud/connectivity"
)
func resourceAliyunSlbAttachment() *schema.Resource {
return &schema.Resource{
Create: resourceAliyunSlbAttachmentCreate,
Read: resourceAliyunSlbAttachmentRead,
Update: resourceAliyunSlbAttachmentUpdate,
Delete: resourceAliyunSlbAttachmentDelete,
Importer: &schema.ResourceImporter{
State: schema.ImportStatePassthrough,
},
Schema: map[string]*schema.Schema{
"slb_id": {
Type: schema.TypeString,
Optional: true,
Deprecated: "Field 'slb_id' has been deprecated from provider version 1.6.0. New field 'load_balancer_id' replaces it.",
},
"load_balancer_id": {
Type: schema.TypeString,
Required: true,
},
"instances": {
Type: schema.TypeSet,
Elem: &schema.Schema{Type: schema.TypeString},
Optional: true,
DiffSuppressFunc: func(k, old, new string, d *schema.ResourceData) bool {
return true
},
Deprecated: "Field 'instances' has been deprecated from provider version 1.6.0. New field 'instance_ids' replaces it.",
},
"instance_ids": {
Type: schema.TypeSet,
Elem: &schema.Schema{Type: schema.TypeString},
Required: true,
MaxItems: 20,
MinItems: 1,
},
"weight": {
Type: schema.TypeInt,
Optional: true,
Default: 100,
ValidateFunc: validateIntegerInRange(0, 100),
},
"backend_servers": {
Type: schema.TypeString,
Optional: true,
Computed: true,
},
},
}
}
func resourceAliyunSlbAttachmentCreate(d *schema.ResourceData, meta interface{}) error {
client := meta.(*connectivity.AliyunClient)
slbService := SlbService{client}
loadBalancer, err := slbService.DescribeLoadBalancerAttribute(d.Get("load_balancer_id").(string))
if err != nil {
return err
}
d.SetId(loadBalancer.LoadBalancerId)
return resourceAliyunSlbAttachmentUpdate(d, meta)
}
func resourceAliyunSlbAttachmentRead(d *schema.ResourceData, meta interface{}) error {
client := meta.(*connectivity.AliyunClient)
slbService := SlbService{client}
loadBalancer, err := slbService.DescribeLoadBalancerAttribute(d.Id())
if err != nil {
if NotFoundError(err) {
d.SetId("")
return nil
}
return err
}
backendServerType := loadBalancer.BackendServers
servers := backendServerType.BackendServer
instanceIds := make([]string, 0, len(servers))
var weight int
if len(servers) > 0 {
weight = servers[0].Weight
for _, e := range servers {
instanceIds = append(instanceIds, e.ServerId)
}
if err != nil {
return err
}
}
d.Set("load_balancer_id", loadBalancer.LoadBalancerId)
d.Set("instance_ids", instanceIds)
d.Set("weight", weight)
d.Set("backend_servers", strings.Join(instanceIds, ","))
return nil
}
func resourceAliyunSlbAttachmentUpdate(d *schema.ResourceData, meta interface{}) error {
client := meta.(*connectivity.AliyunClient)
update := false
weight := d.Get("weight").(int)
if d.HasChange("weight") {
update = true
d.SetPartial("weight")
}
if d.HasChange("instance_ids") {
o, n := d.GetChange("instance_ids")
os := o.(*schema.Set)
ns := n.(*schema.Set)
remove := os.Difference(ns).List()
add := ns.Difference(os).List()
if len(add) > 0 {
req := slb.CreateAddBackendServersRequest()
req.LoadBalancerId = d.Id()
req.BackendServers = expandBackendServersToString(ns.Difference(os).List(), weight)
if err := resource.Retry(2*time.Minute, func() *resource.RetryError {
_, err := client.WithSlbClient(func(slbClient *slb.Client) (interface{}, error) {
return slbClient.AddBackendServers(req)
})
if err != nil {
if IsExceptedErrors(err, SlbIsBusy) {
return resource.RetryableError(fmt.Errorf("Load banalcer adds backend servers timeout and got an error: %#v.", err))
}
return resource.NonRetryableError(fmt.Errorf("Add backend servers got an error: %#v", err))
}
return nil
}); err != nil {
return err
}
}
if len(remove) > 0 {
if err := removeBackendServers(d, meta, remove); err != nil {
return err
}
}
if len(add) < 1 && len(remove) < 1 {
update = true
}
d.SetPartial("instance_ids")
}
if update {
req := slb.CreateSetBackendServersRequest()
req.LoadBalancerId = d.Id()
req.BackendServers = expandBackendServersToString(d.Get("instance_ids").(*schema.Set).List(), weight)
if err := resource.Retry(2*time.Minute, func() *resource.RetryError {
_, err := client.WithSlbClient(func(slbClient *slb.Client) (interface{}, error) {
return slbClient.SetBackendServers(req)
})
if err != nil {
if IsExceptedErrors(err, SlbIsBusy) {
return resource.RetryableError(fmt.Errorf("Load banalcer sets backend servers timeout and got an error: %#v.", err))
}
return resource.NonRetryableError(fmt.Errorf("Set backend servers got an error: %#v", err))
}
return nil
}); err != nil {
return err
}
}
return resourceAliyunSlbAttachmentRead(d, meta)
}
func resourceAliyunSlbAttachmentDelete(d *schema.ResourceData, meta interface{}) error {
return removeBackendServers(d, meta, d.Get("instance_ids").(*schema.Set).List())
}
func removeBackendServers(d *schema.ResourceData, meta interface{}, servers []interface{}) error {
client := meta.(*connectivity.AliyunClient)
slbService := SlbService{client}
instanceSet := d.Get("instance_ids").(*schema.Set)
if len(servers) > 0 {
req := slb.CreateRemoveBackendServersRequest()
req.LoadBalancerId = d.Id()
req.BackendServers = convertListToJsonString(servers)
return resource.Retry(3*time.Minute, func() *resource.RetryError {
_, err := client.WithSlbClient(func(slbClient *slb.Client) (interface{}, error) {
return slbClient.RemoveBackendServers(req)
})
if err != nil {
if IsExceptedErrors(err, SlbIsBusy) {
return resource.RetryableError(fmt.Errorf("Load balancer removes backend servers timeout and got an error: %#v", err))
}
return resource.NonRetryableError(fmt.Errorf("Remove backend servers got an error: %#v", err))
}
loadBalancer, err := slbService.DescribeLoadBalancerAttribute(d.Id())
if err != nil {
if NotFoundError(err) {
return nil
}
return resource.NonRetryableError(fmt.Errorf("DescribeLoadBalancerAttribute got an error: %#v", err))
}
servers := loadBalancer.BackendServers.BackendServer
if len(servers) > 0 {
for _, e := range servers {
if instanceSet.Contains(e.ServerId) {
return resource.RetryableError(fmt.Errorf("There are still target backend servers in the SLB."))
}
}
}
return nil
})
}
return nil
}