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aws_volume.go
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aws_volume.go
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package protokube
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/golang/glog"
"net"
"strconv"
"strings"
"sync"
"time"
)
// The tag name we use to differentiate multiple logically independent clusters running in the same region
const TagNameKubernetesCluster = "KubernetesCluster"
// The tag name we use for specifying that something is in the master role
const TagNameRoleMaster = "k8s.io/role/master"
const TagNameEtcdClusterPrefix = "k8s.io/etcd/"
const TagNameMasterId = "k8s.io/master/id"
//const DefaultAttachDevice = "/dev/xvdb"
var devices = []string{"/dev/xvdu", "/dev/xvdv", "/dev/xvdx", "/dev/xvdx", "/dev/xvdy", "/dev/xvdz"}
type AWSVolumes struct {
ec2 *ec2.EC2
metadata *ec2metadata.EC2Metadata
zone string
clusterTag string
instanceId string
internalIP net.IP
mutex sync.Mutex
deviceMap map[string]string
}
var _ Volumes = &AWSVolumes{}
func NewAWSVolumes() (*AWSVolumes, error) {
a := &AWSVolumes{
deviceMap: make(map[string]string),
}
s := session.New()
s.Handlers.Send.PushFront(func(r *request.Request) {
// Log requests
glog.V(4).Infof("AWS API Request: %s/%s", r.ClientInfo.ServiceName, r.Operation.Name)
})
config := aws.NewConfig()
a.metadata = ec2metadata.New(s, config)
region, err := a.metadata.Region()
if err != nil {
return nil, fmt.Errorf("error querying ec2 metadata service (for az/region): %v", err)
}
a.zone, err = a.metadata.GetMetadata("placement/availability-zone")
if err != nil {
return nil, fmt.Errorf("error querying ec2 metadata service (for az): %v", err)
}
a.instanceId, err = a.metadata.GetMetadata("instance-id")
if err != nil {
return nil, fmt.Errorf("error querying ec2 metadata service (for instance-id): %v", err)
}
a.ec2 = ec2.New(s, config.WithRegion(region))
err = a.discoverTags()
if err != nil {
return nil, err
}
return a, nil
}
func (a *AWSVolumes) ClusterID() string {
return a.clusterTag
}
func (a *AWSVolumes) InternalIP() net.IP {
return a.internalIP
}
func (a *AWSVolumes) discoverTags() error {
instance, err := a.describeInstance()
if err != nil {
return err
}
tagMap := make(map[string]string)
for _, tag := range instance.Tags {
tagMap[aws.StringValue(tag.Key)] = aws.StringValue(tag.Value)
}
clusterID := tagMap[TagNameKubernetesCluster]
if clusterID == "" {
return fmt.Errorf("Cluster tag %q not found on this instance (%q)", TagNameKubernetesCluster, a.instanceId)
}
a.clusterTag = clusterID
a.internalIP = net.ParseIP(aws.StringValue(instance.PrivateIpAddress))
if a.internalIP == nil {
return fmt.Errorf("Internal IP not found on this instance (%q)", a.instanceId)
}
return nil
}
func (a *AWSVolumes) describeInstance() (*ec2.Instance, error) {
request := &ec2.DescribeInstancesInput{}
request.InstanceIds = []*string{&a.instanceId}
var instances []*ec2.Instance
err := a.ec2.DescribeInstancesPages(request, func(p *ec2.DescribeInstancesOutput, lastPage bool) (shouldContinue bool) {
for _, r := range p.Reservations {
instances = append(instances, r.Instances...)
}
return true
})
if err != nil {
return nil, fmt.Errorf("error querying for EC2 instance %q: %v", a.instanceId, err)
}
if len(instances) != 1 {
return nil, fmt.Errorf("unexpected number of instances found with id %q: %d", a.instanceId, len(instances))
}
return instances[0], nil
}
func newEc2Filter(name string, value string) *ec2.Filter {
filter := &ec2.Filter{
Name: aws.String(name),
Values: []*string{
aws.String(value),
},
}
return filter
}
func (a *AWSVolumes) findVolumes(request *ec2.DescribeVolumesInput) ([]*Volume, error) {
var volumes []*Volume
err := a.ec2.DescribeVolumesPages(request, func(p *ec2.DescribeVolumesOutput, lastPage bool) (shouldContinue bool) {
for _, v := range p.Volumes {
volumeID := aws.StringValue(v.VolumeId)
vol := &Volume{
ID: volumeID,
Info: VolumeInfo{
Description: volumeID,
},
}
state := aws.StringValue(v.State)
vol.Status = state
for _, attachment := range v.Attachments {
vol.AttachedTo = aws.StringValue(attachment.InstanceId)
if aws.StringValue(attachment.InstanceId) == a.instanceId {
vol.LocalDevice = aws.StringValue(attachment.Device)
}
}
skipVolume := false
for _, tag := range v.Tags {
k := aws.StringValue(tag.Key)
v := aws.StringValue(tag.Value)
switch k {
case TagNameKubernetesCluster, TagNameRoleMaster, "Name":
// Ignore
case TagNameMasterId:
id, err := strconv.Atoi(v)
if err != nil {
glog.Warningf("error parsing master-id tag on volume %q %s=%s; skipping volume", volumeID, k, v)
skipVolume = true
} else {
vol.Info.MasterID = id
}
default:
if strings.HasPrefix(k, TagNameEtcdClusterPrefix) {
etcdClusterName := k[len(TagNameEtcdClusterPrefix):]
spec, err := ParseEtcdClusterSpec(etcdClusterName, v)
if err != nil {
// Fail safe
glog.Warningf("error parsing etcd cluster tag %q on volume %q; skipping volume: %v", v, volumeID, err)
skipVolume = true
}
vol.Info.EtcdClusters = append(vol.Info.EtcdClusters, spec)
} else {
glog.Warningf("unknown tag on volume %q: %s=%s", volumeID, k, v)
}
}
}
if !skipVolume {
volumes = append(volumes, vol)
}
}
return true
})
if err != nil {
return nil, fmt.Errorf("error querying for EC2 volumes: %v", err)
}
return volumes, nil
}
//func (a *AWSVolumes) FindMountedVolumes() ([]*Volume, error) {
// request := &ec2.DescribeVolumesInput{}
// request.Filters = []*ec2.Filter{
// newEc2Filter("tag:"+TagNameKubernetesCluster, a.clusterTag),
// newEc2Filter("tag-key", TagNameRoleMaster),
// newEc2Filter("attachment.instance-id", a.instanceId),
// }
//
// return a.findVolumes(request)
//}
//
//func (a *AWSVolumes) FindMountableVolumes() ([]*Volume, error) {
// request := &ec2.DescribeVolumesInput{}
// request.Filters = []*ec2.Filter{
// newEc2Filter("tag:"+TagNameKubernetesCluster, a.clusterTag),
// newEc2Filter("tag-key", TagNameRoleMaster),
// newEc2Filter("availability-zone", a.zone),
// }
//
// return a.findVolumes(request)
//}
func (a *AWSVolumes) FindVolumes() ([]*Volume, error) {
request := &ec2.DescribeVolumesInput{}
request.Filters = []*ec2.Filter{
newEc2Filter("tag:"+TagNameKubernetesCluster, a.clusterTag),
newEc2Filter("tag-key", TagNameRoleMaster),
newEc2Filter("availability-zone", a.zone),
}
return a.findVolumes(request)
}
// assignDevice picks a hopefully unused device and reserves it for the volume attachment
func (a *AWSVolumes) assignDevice(volumeID string) (string, error) {
a.mutex.Lock()
defer a.mutex.Unlock()
// TODO: Check for actual devices in use (like cloudprovider does)
for _, d := range devices {
if a.deviceMap[d] == "" {
a.deviceMap[d] = volumeID
return d, nil
}
}
return "", fmt.Errorf("All devices in use")
}
// releaseDevice releases the volume mapping lock; used when an attach was known to fail
func (a *AWSVolumes) releaseDevice(d string, volumeID string) {
a.mutex.Lock()
defer a.mutex.Unlock()
if a.deviceMap[d] != volumeID {
glog.Fatalf("deviceMap logic error: %q -> %q, not %q", d, a.deviceMap[d], volumeID)
}
a.deviceMap[d] = ""
}
// AttachVolume attaches the specified volume to this instance, returning the mountpoint & nil if successful
func (a *AWSVolumes) AttachVolume(volume *Volume) error {
volumeID := volume.ID
device := volume.LocalDevice
if device == "" {
d, err := a.assignDevice(volumeID)
if err != nil {
return err
}
device = d
request := &ec2.AttachVolumeInput{
Device: aws.String(device),
InstanceId: aws.String(a.instanceId),
VolumeId: aws.String(volumeID),
}
attachResponse, err := a.ec2.AttachVolume(request)
if err != nil {
return fmt.Errorf("Error attaching EBS volume %q: %v", volumeID, err)
}
glog.V(2).Infof("AttachVolume request returned %v", attachResponse)
}
// Wait (forever) for volume to attach or reach a failure-to-attach condition
for {
request := &ec2.DescribeVolumesInput{
VolumeIds: []*string{&volumeID},
}
volumes, err := a.findVolumes(request)
if err != nil {
return fmt.Errorf("Error describing EBS volume %q: %v", volumeID, err)
}
if len(volumes) == 0 {
return fmt.Errorf("EBS volume %q disappeared during attach", volumeID)
}
if len(volumes) != 1 {
return fmt.Errorf("Multiple volumes found with id %q", volumeID)
}
v := volumes[0]
if v.AttachedTo != "" {
if v.AttachedTo == a.instanceId {
volume.LocalDevice = device
return nil
} else {
a.releaseDevice(device, volumeID)
return fmt.Errorf("Unable to attach volume %q, was attached to %q", volumeID, v.AttachedTo)
}
}
switch v.Status {
case "attaching":
glog.V(2).Infof("Waiting for volume %q to be attached (currently %q)", volumeID, v.Status)
// continue looping
default:
return fmt.Errorf("Observed unexpected volume state %q", v.Status)
}
time.Sleep(10 * time.Second)
}
}