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volume.go
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volume.go
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//
// Copyright (c) 2017, Cisco Systems
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice, this
// list of conditions and the following disclaimer in the documentation and/or
// other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
package aws
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/cisco/arc/pkg/aaa"
"github.com/cisco/arc/pkg/config"
"github.com/cisco/arc/pkg/log"
"github.com/cisco/arc/pkg/msg"
"github.com/cisco/arc/pkg/resource"
"github.com/cisco/arc/pkg/route"
)
// volume implements the resource.ProviderVolume interface.
type volume struct {
*config.Volume
ec2 *ec2.EC2
compute *compute
volumeParams *ec2.BlockDeviceMapping
instance *instance
id string
volume *ec2.Volume
cached bool
}
// newVolume is the constructor for a volume object. it returns a non-nil error upon failure.
func newVolume(comp resource.Compute, cfg *config.Volume, p *dataCenterProvider) (resource.ProviderVolume, error) {
log.Info("Initializing AWS volume %q", cfg.Device())
c, ok := comp.ProviderCompute().(*compute)
if !ok {
return nil, fmt.Errorf("AWS newVolume: Unable to obtain compute")
}
// Build the parameters that will be used by the instance
params := &ec2.BlockDeviceMapping{
DeviceName: aws.String(cfg.Device()),
Ebs: &ec2.EbsBlockDevice{
DeleteOnTermination: aws.Bool(!cfg.Keep()),
VolumeSize: aws.Int64(cfg.Size()),
VolumeType: aws.String(cfg.Type()),
},
}
if !cfg.Boot() {
params.Ebs.Encrypted = aws.Bool(true)
}
v := &volume{
Volume: cfg,
ec2: p.ec2,
compute: c,
volumeParams: params,
}
return v, nil
}
func (v *volume) Route(req *route.Request) route.Response {
return route.FAIL
}
func (v *volume) Audit(flags ...string) error {
if len(flags) == 0 || flags[0] == "" {
return fmt.Errorf("No flag set to find audit object")
}
a := aaa.AuditBuffer[flags[0]]
if a == nil {
return fmt.Errorf("Audit object does not exist")
}
// Configured but not Deployed
if v.Destroyed() && v.instance != nil {
a.Audit(aaa.Mismatched, "Instance %q | The volume %s, %s is configured, but not deployed", v.instance.Name(), v.Device(), v.MountPoint())
// Have the function return early if there aren't volumes deployed to compare with
return nil
}
// Mismatches
// Encrypted Volumes?
if v.volume.Encrypted != nil && !*v.volume.Encrypted && !v.Boot() {
a.Audit(aaa.Mismatched, "Instance %q | Deployed Volume %q is not encrypted", v.instance.Name(), *v.volume.VolumeId)
}
// Correct Size
if v.volume.Size != nil && *v.volume.Size != v.Size() {
a.Audit(aaa.Mismatched, "Instance %q | Configured Volume Size: %d - Deployed Volume Size: %d", v.instance.Name(), v.Size(), v.volume.Size)
}
return nil
}
func (v *volume) associateInstance(i *instance) {
v.instance = i
}
func (v *volume) associateVolume(volume *ec2.InstanceBlockDeviceMapping) {
v.id = *volume.Ebs.VolumeId
log.Debug("Associating volume %q", v.Id())
v.set(v.compute.volumeCache.find(v))
if v.volume != nil {
log.Debug("Using cached volume %s", v.Id())
v.cached = true
}
}
func (v *volume) set(volume *ec2.Volume) {
v.volume = volume
}
func (v *volume) clear() {
v.volume = nil
v.id = ""
}
func (v *volume) Load() error {
// Use a cached value if it exists.
if v.cached {
log.Debug("Skipping volume load, cached...")
return nil
}
// A cached value doesn't exist, so lets ask AWS.
if v.instance == nil || v.Id() == "" {
log.Debug("Volume is not associated with an instance, skipping load.")
return nil
}
params := &ec2.DescribeVolumesInput{
Filters: []*ec2.Filter{
{
Name: aws.String("volume-id"),
Values: []*string{aws.String(v.Id())},
},
},
VolumeIds: []*string{aws.String(v.Id())},
}
resp, err := v.ec2.DescribeVolumes(params)
if err != nil {
return err
}
if resp == nil || resp.Volumes == nil || len(resp.Volumes) != 1 || v.Id() != *resp.Volumes[0].VolumeId {
if resp != nil {
log.Error("Unusable DescribeVolumesOutput: %+v", resp)
}
return fmt.Errorf("DescribeVolumes returned unusable result")
}
v.set(resp.Volumes[0])
return nil
}
func (v *volume) reload(test func() bool, m string) bool {
// Clear the cached value
log.Debug("Clearing cached value for %s", v.Id())
v.cached = false
return msg.Wait(
fmt.Sprintf("Waiting for Volume %q to %s", v.Device(), m), //title
fmt.Sprintf("Volume %q failed to %s", v.Id(), m), //err
300, // duration
test, // test()
func() bool { // load()
if err := v.Load(); err != nil {
msg.Error(err.Error())
return false
}
return true
},
)
}
func (v *volume) Created() bool {
return v.volume != nil
}
func (v *volume) Destroyed() bool {
return v.volume == nil
}
func (v *volume) Id() string {
return v.id
}
func (v *volume) State() string {
if !v.Created() {
return ""
}
return *v.volume.State
}
// Attached returns true if the volume is attached to an instance.
func (v *volume) Attached() bool {
if v.State() == "in-use" {
return true
}
return false
}
// Detached returns true if the volume is detached from an instance.
func (v *volume) Detached() bool {
if v.State() == "available" {
return true
}
return false
}
// Detach this volume from the associated instance.
func (v *volume) Detach() error {
if v.Destroyed() {
return nil
}
log.Debug("Detaching volume %q from %q", v.Device(), v.MountPoint())
params := &ec2.DetachVolumeInput{
Device: aws.String(v.Device()),
InstanceId: aws.String(v.instance.Id()),
VolumeId: aws.String(v.Id()),
}
_, err := v.ec2.DetachVolume(params)
if err != nil {
return err
}
if !v.reload(v.Detached, "detach") {
return fmt.Errorf("Unable to detach volume %q", v.Id())
}
log.Debug("Volume detached from %q with instance %q", v.Id(), v.instance.Id())
aaa.Accounting("Volume detached: %s, %s, %s", v.Device(), v.MountPoint(), v.Id())
return nil
}
// Attach this volume to the associated instance.
func (v *volume) Attach() error {
if v.Destroyed() {
return nil
}
log.Debug("Attaching volume %q to %q", v.Device(), v.MountPoint())
params := &ec2.AttachVolumeInput{
Device: aws.String(v.Device()),
InstanceId: aws.String(v.instance.Id()),
VolumeId: aws.String(v.Id()),
}
_, err := v.ec2.AttachVolume(params)
if err != nil {
return err
}
if !v.reload(v.Attached, "attach") {
return fmt.Errorf("Unable to detach volume %q", v.Id())
}
log.Debug("Volume attached to volume %q with instance %q", v.Id(), v.instance.Id())
aaa.Accounting("Volume attached: %s, %s, %s", v.Device(), v.MountPoint(), v.Id())
return nil
}
// Destroy this volume. Detach must be called prior to this otherwise this will
// return an error.
func (v *volume) Destroy() error {
if v.Destroyed() {
return nil
}
log.Debug("Destroying volume %q, %q", v.Device(), v.MountPoint())
params := &ec2.DeleteVolumeInput{
VolumeId: aws.String(v.Id()),
}
if _, err := v.ec2.DeleteVolume(params); err != nil {
return err
}
v.clear()
aaa.Accounting("Volume destroyed: %s%s, %s", v.Device(), v.MountPoint(), v.Id())
v.compute.volumeCache.remove(v)
return nil
}
func (v *volume) Reset() {
v.clear()
}
func (v *volume) SetTags(t map[string]string) error {
return setTags(v.ec2, t, v.Id())
}
func (v *volume) Info() {
if v.Destroyed() {
return
}
msg.Info("Volume")
msg.Detail("%-20s\t%s", "Id", v.Id())
msg.Detail("%-20s\t%s", "State", v.State())
msg.Detail("%-20s\t%s", "Instance Id", v.instance.Id())
msg.Detail("%-20s\t%t", "Encrypted", *v.volume.Encrypted)
msg.Detail("%-20s\t%d", "Size", *v.volume.Size)
msg.Detail("%-20s\t%s", "Type", *v.volume.VolumeType)
printTags(v.volume.Tags)
}