109 lines
4.0 KiB
Go
109 lines
4.0 KiB
Go
package volumes
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import (
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"fmt"
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"strings"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/ec2"
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"k8s.io/client-go/pkg/api/v1"
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"github.com/zalando-incubator/postgres-operator/pkg/util/constants"
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"github.com/zalando-incubator/postgres-operator/pkg/util/retryutil"
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)
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// EBSVolumeResizer implements volume resizing interface for AWS EBS volumes.
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type EBSVolumeResizer struct {
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connection *ec2.EC2
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}
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// ConnectToProvider connects to AWS.
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func (c *EBSVolumeResizer) ConnectToProvider() error {
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sess, err := session.NewSession(&aws.Config{Region: aws.String(constants.AWSRegion)})
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if err != nil {
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return fmt.Errorf("could not establish AWS session: %v", err)
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}
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c.connection = ec2.New(sess)
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return nil
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}
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// IsConnectedToProvider checks if AWS connection is established.
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func (c *EBSVolumeResizer) IsConnectedToProvider() bool {
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return c.connection != nil
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}
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// VolumeBelongsToProvider checks if the given persistent volume is backed by EBS.
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func (c *EBSVolumeResizer) VolumeBelongsToProvider(pv *v1.PersistentVolume) bool {
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return pv.Spec.AWSElasticBlockStore != nil && pv.Annotations[constants.VolumeStorateProvisionerAnnotation] == constants.EBSProvisioner
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}
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// GetProviderVolumeID converts aws://eu-central-1b/vol-00f93d4827217c629 to vol-00f93d4827217c629 for EBS volumes
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func (c *EBSVolumeResizer) GetProviderVolumeID(pv *v1.PersistentVolume) (string, error) {
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volumeID := pv.Spec.AWSElasticBlockStore.VolumeID
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if volumeID == "" {
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return "", fmt.Errorf("volume id is empty for volume %q", pv.Name)
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}
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idx := strings.LastIndex(volumeID, constants.EBSVolumeIDStart) + 1
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if idx == 0 {
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return "", fmt.Errorf("malfored EBS volume id %q", volumeID)
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}
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return volumeID[idx:], nil
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}
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// ResizeVolume actually calls AWS API to resize the EBS volume if necessary.
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func (c *EBSVolumeResizer) ResizeVolume(volumeID string, newSize int64) error {
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/* first check if the volume is already of a requested size */
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volumeOutput, err := c.connection.DescribeVolumes(&ec2.DescribeVolumesInput{VolumeIds: []*string{&volumeID}})
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if err != nil {
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return fmt.Errorf("could not get information about the volume: %v", err)
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}
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vol := volumeOutput.Volumes[0]
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if *vol.VolumeId != volumeID {
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return fmt.Errorf("describe volume %q returned information about a non-matching volume %q", volumeID, *vol.VolumeId)
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}
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if *vol.Size == newSize {
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// nothing to do
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return nil
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}
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input := ec2.ModifyVolumeInput{Size: &newSize, VolumeId: &volumeID}
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output, err := c.connection.ModifyVolume(&input)
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if err != nil {
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return fmt.Errorf("could not modify persistent volume: %v", err)
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}
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state := *output.VolumeModification.ModificationState
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if state == constants.EBSVolumeStateFailed {
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return fmt.Errorf("could not modify persistent volume %q: modification state failed", volumeID)
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}
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if state == "" {
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return fmt.Errorf("received empty modification status")
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}
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if state == constants.EBSVolumeStateOptimizing || state == constants.EBSVolumeStateCompleted {
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return nil
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}
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// wait until the volume reaches the "optimizing" or "completed" state
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in := ec2.DescribeVolumesModificationsInput{VolumeIds: []*string{&volumeID}}
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return retryutil.Retry(constants.EBSVolumeResizeWaitInterval, constants.EBSVolumeResizeWaitTimeout,
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func() (bool, error) {
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out, err := c.connection.DescribeVolumesModifications(&in)
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if err != nil {
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return false, fmt.Errorf("could not describe volume modification: %v", err)
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}
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if len(out.VolumesModifications) != 1 {
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return false, fmt.Errorf("describe volume modification didn't return one record for volume %q", volumeID)
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}
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if *out.VolumesModifications[0].VolumeId != volumeID {
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return false, fmt.Errorf("non-matching volume id when describing modifications: %q is different from %q",
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*out.VolumesModifications[0].VolumeId, volumeID)
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}
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return *out.VolumesModifications[0].ModificationState != constants.EBSVolumeStateModifying, nil
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})
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}
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// DisconnectFromProvider closes connection to the EC2 instance
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func (c *EBSVolumeResizer) DisconnectFromProvider() error {
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c.connection = nil
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return nil
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}
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