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resource_aws_volume_attachment.go
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resource_aws_volume_attachment.go
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package aws
import (
"bytes"
"fmt"
"log"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/hashicorp/terraform/helper/hashcode"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/helper/schema"
)
func resourceAwsVolumeAttachment() *schema.Resource {
return &schema.Resource{
Create: resourceAwsVolumeAttachmentCreate,
Read: resourceAwsVolumeAttachmentRead,
Delete: resourceAwsVolumeAttachmentDelete,
Schema: map[string]*schema.Schema{
"device_name": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"instance_id": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"volume_id": {
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"force_detach": {
Type: schema.TypeBool,
Optional: true,
Computed: true,
},
"skip_destroy": {
Type: schema.TypeBool,
Optional: true,
Computed: true,
},
},
}
}
func resourceAwsVolumeAttachmentCreate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
name := d.Get("device_name").(string)
iID := d.Get("instance_id").(string)
vID := d.Get("volume_id").(string)
// Find out if the volume is already attached to the instance, in which case
// we have nothing to do
request := &ec2.DescribeVolumesInput{
VolumeIds: []*string{aws.String(vID)},
Filters: []*ec2.Filter{
&ec2.Filter{
Name: aws.String("attachment.instance-id"),
Values: []*string{aws.String(iID)},
},
&ec2.Filter{
Name: aws.String("attachment.device"),
Values: []*string{aws.String(name)},
},
},
}
vols, err := conn.DescribeVolumes(request)
if (err != nil) || (len(vols.Volumes) == 0) {
// not attached
opts := &ec2.AttachVolumeInput{
Device: aws.String(name),
InstanceId: aws.String(iID),
VolumeId: aws.String(vID),
}
log.Printf("[DEBUG] Attaching Volume (%s) to Instance (%s)", vID, iID)
_, err := conn.AttachVolume(opts)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
return fmt.Errorf("[WARN] Error attaching volume (%s) to instance (%s), message: \"%s\", code: \"%s\"",
vID, iID, awsErr.Message(), awsErr.Code())
}
return err
}
}
stateConf := &resource.StateChangeConf{
Pending: []string{"attaching"},
Target: []string{"attached"},
Refresh: volumeAttachmentStateRefreshFunc(conn, vID, iID),
Timeout: 5 * time.Minute,
Delay: 10 * time.Second,
MinTimeout: 3 * time.Second,
}
_, err = stateConf.WaitForState()
if err != nil {
return fmt.Errorf(
"Error waiting for Volume (%s) to attach to Instance: %s, error: %s",
vID, iID, err)
}
d.SetId(volumeAttachmentID(name, vID, iID))
return resourceAwsVolumeAttachmentRead(d, meta)
}
func volumeAttachmentStateRefreshFunc(conn *ec2.EC2, volumeID, instanceID string) resource.StateRefreshFunc {
return func() (interface{}, string, error) {
request := &ec2.DescribeVolumesInput{
VolumeIds: []*string{aws.String(volumeID)},
Filters: []*ec2.Filter{
&ec2.Filter{
Name: aws.String("attachment.instance-id"),
Values: []*string{aws.String(instanceID)},
},
},
}
resp, err := conn.DescribeVolumes(request)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
return nil, "failed", fmt.Errorf("code: %s, message: %s", awsErr.Code(), awsErr.Message())
}
return nil, "failed", err
}
if len(resp.Volumes) > 0 {
v := resp.Volumes[0]
for _, a := range v.Attachments {
if a.InstanceId != nil && *a.InstanceId == instanceID {
return a, *a.State, nil
}
}
}
// assume detached if volume count is 0
return 42, "detached", nil
}
}
func resourceAwsVolumeAttachmentRead(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
request := &ec2.DescribeVolumesInput{
VolumeIds: []*string{aws.String(d.Get("volume_id").(string))},
Filters: []*ec2.Filter{
&ec2.Filter{
Name: aws.String("attachment.instance-id"),
Values: []*string{aws.String(d.Get("instance_id").(string))},
},
},
}
vols, err := conn.DescribeVolumes(request)
if err != nil {
if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "InvalidVolume.NotFound" {
d.SetId("")
return nil
}
return fmt.Errorf("Error reading EC2 volume %s for instance: %s: %#v", d.Get("volume_id").(string), d.Get("instance_id").(string), err)
}
if len(vols.Volumes) == 0 || *vols.Volumes[0].State == "available" {
log.Printf("[DEBUG] Volume Attachment (%s) not found, removing from state", d.Id())
d.SetId("")
}
return nil
}
func resourceAwsVolumeAttachmentDelete(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
if _, ok := d.GetOk("skip_destroy"); ok {
log.Printf("[INFO] Found skip_destroy to be true, removing attachment %q from state", d.Id())
d.SetId("")
return nil
}
vID := d.Get("volume_id").(string)
iID := d.Get("instance_id").(string)
opts := &ec2.DetachVolumeInput{
Device: aws.String(d.Get("device_name").(string)),
InstanceId: aws.String(iID),
VolumeId: aws.String(vID),
Force: aws.Bool(d.Get("force_detach").(bool)),
}
_, err := conn.DetachVolume(opts)
if err != nil {
return fmt.Errorf("Failed to detach Volume (%s) from Instance (%s): %s",
vID, iID, err)
}
stateConf := &resource.StateChangeConf{
Pending: []string{"detaching"},
Target: []string{"detached"},
Refresh: volumeAttachmentStateRefreshFunc(conn, vID, iID),
Timeout: 5 * time.Minute,
Delay: 10 * time.Second,
MinTimeout: 3 * time.Second,
}
log.Printf("[DEBUG] Detaching Volume (%s) from Instance (%s)", vID, iID)
_, err = stateConf.WaitForState()
if err != nil {
return fmt.Errorf(
"Error waiting for Volume (%s) to detach from Instance: %s",
vID, iID)
}
d.SetId("")
return nil
}
func volumeAttachmentID(name, volumeID, instanceID string) string {
var buf bytes.Buffer
buf.WriteString(fmt.Sprintf("%s-", name))
buf.WriteString(fmt.Sprintf("%s-", instanceID))
buf.WriteString(fmt.Sprintf("%s-", volumeID))
return fmt.Sprintf("vai-%d", hashcode.String(buf.String()))
}