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filesystem_events.go
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filesystem_events.go
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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package storageprovisioner
import (
"github.com/juju/errors"
"github.com/juju/names"
"github.com/juju/juju/apiserver/params"
"github.com/juju/juju/instance"
"github.com/juju/juju/storage"
)
// filesystemsChanged is called when the lifecycle states of the filesystems
// with the provided IDs have been seen to have changed.
func filesystemsChanged(ctx *context, changes []string) error {
tags := make([]names.Tag, len(changes))
for i, change := range changes {
tags[i] = names.NewFilesystemTag(change)
}
alive, dying, dead, err := storageEntityLife(ctx, tags)
if err != nil {
return errors.Trace(err)
}
logger.Debugf("filesystems alive: %v, dying: %v, dead: %v", alive, dying, dead)
if len(alive)+len(dying)+len(dead) == 0 {
return nil
}
// Get filesystem information for filesystems, so we can provision,
// deprovision, attach and detach.
filesystemTags := make([]names.FilesystemTag, 0, len(alive)+len(dying)+len(dead))
for _, tag := range alive {
filesystemTags = append(filesystemTags, tag.(names.FilesystemTag))
}
for _, tag := range dying {
filesystemTags = append(filesystemTags, tag.(names.FilesystemTag))
}
for _, tag := range dead {
filesystemTags = append(filesystemTags, tag.(names.FilesystemTag))
}
filesystemResults, err := ctx.filesystemAccessor.Filesystems(filesystemTags)
if err != nil {
return errors.Annotatef(err, "getting filesystem information")
}
aliveFilesystemTags := filesystemTags[:len(alive)]
dyingFilesystemTags := filesystemTags[len(alive) : len(alive)+len(dying)]
deadFilesystemTags := filesystemTags[len(alive)+len(dying):]
aliveFilesystemResults := filesystemResults[:len(alive)]
dyingFilesystemResults := filesystemResults[len(alive) : len(alive)+len(dying)]
deadFilesystemResults := filesystemResults[len(alive)+len(dying):]
if err := processDeadFilesystems(ctx, deadFilesystemTags, deadFilesystemResults); err != nil {
return errors.Annotate(err, "deprovisioning filesystems")
}
if err := processDyingFilesystems(ctx, dyingFilesystemTags, dyingFilesystemResults); err != nil {
return errors.Annotate(err, "processing dying filesystems")
}
if err := processAliveFilesystems(ctx, aliveFilesystemTags, aliveFilesystemResults); err != nil {
return errors.Annotate(err, "provisioning filesystems")
}
return nil
}
// filesystemAttachmentsChanged is called when the lifecycle states of the filesystem
// attachments with the provided IDs have been seen to have changed.
func filesystemAttachmentsChanged(ctx *context, ids []params.MachineStorageId) error {
alive, dying, dead, err := attachmentLife(ctx, ids)
if err != nil {
return errors.Trace(err)
}
logger.Debugf("filesystem attachment alive: %v, dying: %v, dead: %v", alive, dying, dead)
if len(dead) != 0 {
// We should not see dead filesystem attachments;
// attachments go directly from Dying to removed.
logger.Warningf("unexpected dead filesystem attachments: %v", dead)
}
if len(alive)+len(dying) == 0 {
return nil
}
// Get filesystem information for alive and dying filesystem attachments, so
// we can attach/detach.
ids = append(alive, dying...)
filesystemAttachmentResults, err := ctx.filesystemAccessor.FilesystemAttachments(ids)
if err != nil {
return errors.Annotatef(err, "getting filesystem attachment information")
}
// Deprovision Dying filesystem attachments.
dyingFilesystemAttachmentResults := filesystemAttachmentResults[len(alive):]
if err := processDyingFilesystemAttachments(ctx, dying, dyingFilesystemAttachmentResults); err != nil {
return errors.Annotate(err, "destroying filesystem attachments")
}
// Provision Alive filesystem attachments.
aliveFilesystemAttachmentResults := filesystemAttachmentResults[:len(alive)]
if err := processAliveFilesystemAttachments(ctx, alive, aliveFilesystemAttachmentResults); err != nil {
return errors.Annotate(err, "creating filesystem attachments")
}
return nil
}
// processDyingFilesystems processes the FilesystemResults for Dying filesystems,
// removing them from provisioning-pending as necessary.
func processDyingFilesystems(ctx *context, tags []names.FilesystemTag, filesystemResults []params.FilesystemResult) error {
for _, tag := range tags {
removePendingFilesystem(ctx, tag)
}
return nil
}
func updateFilesystem(ctx *context, info storage.Filesystem) {
ctx.filesystems[info.Tag] = info
for id, params := range ctx.incompleteFilesystemAttachmentParams {
if params.FilesystemId == "" && id.AttachmentTag == info.Tag.String() {
updatePendingFilesystemAttachment(ctx, id, params)
}
}
}
func updatePendingFilesystem(ctx *context, params storage.FilesystemParams) {
if params.Volume != (names.VolumeTag{}) {
// The filesystem is volume-backed: we must watch for
// the corresponding block device. This will trigger a
// one-time (for the volume) forced update of block
// devices. If the block device is not immediately
// available, then we rely on the watcher. The forced
// update is necessary in case the block device was
// added to state already, and we didn't observe it.
if _, ok := ctx.volumeBlockDevices[params.Volume]; !ok {
ctx.pendingVolumeBlockDevices.Add(params.Volume)
ctx.incompleteFilesystemParams[params.Tag] = params
return
}
}
delete(ctx.incompleteFilesystemParams, params.Tag)
scheduleOperations(ctx, &createFilesystemOp{args: params})
}
func removePendingFilesystem(ctx *context, tag names.FilesystemTag) {
delete(ctx.incompleteFilesystemParams, tag)
ctx.schedule.Remove(tag)
}
// updatePendingFilesystemAttachment adds the given filesystem attachment params to
// either the incomplete set or the schedule. If the params are incomplete
// due to a missing instance ID, updatePendingFilesystemAttachment will request
// that the machine be watched so its instance ID can be learned.
func updatePendingFilesystemAttachment(
ctx *context,
id params.MachineStorageId,
params storage.FilesystemAttachmentParams,
) {
var incomplete bool
filesystem, ok := ctx.filesystems[params.Filesystem]
if !ok {
incomplete = true
} else {
params.FilesystemId = filesystem.FilesystemId
if filesystem.Volume != (names.VolumeTag{}) {
// The filesystem is volume-backed: if the filesystem
// was created in another session, then the block device
// may not have been seen yet. We must wait for the block
// device watcher to trigger.
if _, ok := ctx.volumeBlockDevices[filesystem.Volume]; !ok {
incomplete = true
}
}
}
if params.InstanceId == "" {
watchMachine(ctx, params.Machine)
incomplete = true
}
if params.FilesystemId == "" {
incomplete = true
}
if incomplete {
ctx.incompleteFilesystemAttachmentParams[id] = params
return
}
delete(ctx.incompleteFilesystemAttachmentParams, id)
scheduleOperations(ctx, &attachFilesystemOp{args: params})
}
// removePendingFilesystemAttachment removes the specified pending filesystem
// attachment from the incomplete set and/or the schedule if it exists
// there.
func removePendingFilesystemAttachment(ctx *context, id params.MachineStorageId) {
delete(ctx.incompleteFilesystemAttachmentParams, id)
ctx.schedule.Remove(id)
}
// processDeadFilesystems processes the FilesystemResults for Dead filesystems,
// deprovisioning filesystems and removing from state as necessary.
func processDeadFilesystems(ctx *context, tags []names.FilesystemTag, filesystemResults []params.FilesystemResult) error {
for _, tag := range tags {
removePendingFilesystem(ctx, tag)
}
var destroy []names.FilesystemTag
var remove []names.Tag
for i, result := range filesystemResults {
tag := tags[i]
if result.Error == nil {
logger.Debugf("filesystem %s is provisioned, queuing for deprovisioning", tag.Id())
filesystem, err := filesystemFromParams(result.Result)
if err != nil {
return errors.Annotate(err, "getting filesystem info")
}
updateFilesystem(ctx, filesystem)
destroy = append(destroy, tag)
continue
}
if params.IsCodeNotProvisioned(result.Error) {
logger.Debugf("filesystem %s is not provisioned, queuing for removal", tag.Id())
remove = append(remove, tag)
continue
}
return errors.Annotatef(result.Error, "getting filesystem information for filesystem %s", tag.Id())
}
if len(destroy) > 0 {
ops := make([]scheduleOp, len(destroy))
for i, tag := range destroy {
ops[i] = &destroyFilesystemOp{tag: tag}
}
scheduleOperations(ctx, ops...)
}
if err := removeEntities(ctx, remove); err != nil {
return errors.Annotate(err, "removing filesystems from state")
}
return nil
}
// processDyingFilesystemAttachments processes the FilesystemAttachmentResults for
// Dying filesystem attachments, detaching filesystems and updating state as necessary.
func processDyingFilesystemAttachments(
ctx *context,
ids []params.MachineStorageId,
filesystemAttachmentResults []params.FilesystemAttachmentResult,
) error {
for _, id := range ids {
removePendingFilesystemAttachment(ctx, id)
}
detach := make([]params.MachineStorageId, 0, len(ids))
remove := make([]params.MachineStorageId, 0, len(ids))
for i, result := range filesystemAttachmentResults {
id := ids[i]
if result.Error == nil {
detach = append(detach, id)
continue
}
if params.IsCodeNotProvisioned(result.Error) {
remove = append(remove, id)
continue
}
return errors.Annotatef(result.Error, "getting information for filesystem attachment %v", id)
}
if len(detach) > 0 {
attachmentParams, err := filesystemAttachmentParams(ctx, detach)
if err != nil {
return errors.Trace(err)
}
ops := make([]scheduleOp, len(attachmentParams))
for i, p := range attachmentParams {
ops[i] = &detachFilesystemOp{args: p}
}
scheduleOperations(ctx, ops...)
}
if err := removeAttachments(ctx, remove); err != nil {
return errors.Annotate(err, "removing attachments from state")
}
return nil
}
// processAliveFilesystems processes the FilesystemResults for Alive filesystems,
// provisioning filesystems and setting the info in state as necessary.
func processAliveFilesystems(ctx *context, tags []names.FilesystemTag, filesystemResults []params.FilesystemResult) error {
// Filter out the already-provisioned filesystems.
pending := make([]names.FilesystemTag, 0, len(tags))
for i, result := range filesystemResults {
tag := tags[i]
if result.Error == nil {
// Filesystem is already provisioned: skip.
logger.Debugf("filesystem %q is already provisioned, nothing to do", tag.Id())
filesystem, err := filesystemFromParams(result.Result)
if err != nil {
return errors.Annotate(err, "getting filesystem info")
}
updateFilesystem(ctx, filesystem)
if filesystem.Volume != (names.VolumeTag{}) {
// Ensure that volume-backed filesystems' block
// devices are present even after creating the
// filesystem, so that attachments can be made.
maybeAddPendingVolumeBlockDevice(ctx, filesystem.Volume)
}
continue
}
if !params.IsCodeNotProvisioned(result.Error) {
return errors.Annotatef(
result.Error, "getting filesystem information for filesystem %q", tag.Id(),
)
}
// The filesystem has not yet been provisioned, so record its tag
// to enquire about parameters below.
pending = append(pending, tag)
}
if len(pending) == 0 {
return nil
}
params, err := filesystemParams(ctx, pending)
if err != nil {
return errors.Annotate(err, "getting filesystem params")
}
for _, params := range params {
updatePendingFilesystem(ctx, params)
}
return nil
}
func maybeAddPendingVolumeBlockDevice(ctx *context, v names.VolumeTag) {
if _, ok := ctx.volumeBlockDevices[v]; !ok {
ctx.pendingVolumeBlockDevices.Add(v)
}
}
// processAliveFilesystemAttachments processes the FilesystemAttachmentResults
// for Alive filesystem attachments, attaching filesystems and setting the info
// in state as necessary.
func processAliveFilesystemAttachments(
ctx *context,
ids []params.MachineStorageId,
filesystemAttachmentResults []params.FilesystemAttachmentResult,
) error {
// Filter out the already-attached.
pending := make([]params.MachineStorageId, 0, len(ids))
for i, result := range filesystemAttachmentResults {
if result.Error == nil {
// Filesystem attachment is already provisioned: if we
// didn't (re)attach in this session, then we must do
// so now.
action := "nothing to do"
if _, ok := ctx.filesystemAttachments[ids[i]]; !ok {
// Not yet (re)attached in this session.
pending = append(pending, ids[i])
action = "will reattach"
}
logger.Debugf(
"%s is already attached to %s, %s",
ids[i].AttachmentTag, ids[i].MachineTag, action,
)
removePendingFilesystemAttachment(ctx, ids[i])
continue
}
if !params.IsCodeNotProvisioned(result.Error) {
return errors.Annotatef(
result.Error, "getting information for attachment %v", ids[i],
)
}
// The filesystem has not yet been attached, so
// record its tag to enquire about parameters below.
pending = append(pending, ids[i])
}
if len(pending) == 0 {
return nil
}
params, err := filesystemAttachmentParams(ctx, pending)
if err != nil {
return errors.Trace(err)
}
for i, params := range params {
updatePendingFilesystemAttachment(ctx, pending[i], params)
}
return nil
}
// filesystemAttachmentParams obtains the specified attachments' parameters.
func filesystemAttachmentParams(
ctx *context, ids []params.MachineStorageId,
) ([]storage.FilesystemAttachmentParams, error) {
paramsResults, err := ctx.filesystemAccessor.FilesystemAttachmentParams(ids)
if err != nil {
return nil, errors.Annotate(err, "getting filesystem attachment params")
}
attachmentParams := make([]storage.FilesystemAttachmentParams, len(ids))
for i, result := range paramsResults {
if result.Error != nil {
return nil, errors.Annotate(result.Error, "getting filesystem attachment parameters")
}
params, err := filesystemAttachmentParamsFromParams(result.Result)
if err != nil {
return nil, errors.Annotate(err, "getting filesystem attachment parameters")
}
attachmentParams[i] = params
}
return attachmentParams, nil
}
// filesystemParams obtains the specified filesystems' parameters.
func filesystemParams(ctx *context, tags []names.FilesystemTag) ([]storage.FilesystemParams, error) {
paramsResults, err := ctx.filesystemAccessor.FilesystemParams(tags)
if err != nil {
return nil, errors.Annotate(err, "getting filesystem params")
}
allParams := make([]storage.FilesystemParams, len(tags))
for i, result := range paramsResults {
if result.Error != nil {
return nil, errors.Annotate(result.Error, "getting filesystem parameters")
}
params, err := filesystemParamsFromParams(result.Result)
if err != nil {
return nil, errors.Annotate(err, "getting filesystem parameters")
}
allParams[i] = params
}
return allParams, nil
}
func filesystemFromParams(in params.Filesystem) (storage.Filesystem, error) {
filesystemTag, err := names.ParseFilesystemTag(in.FilesystemTag)
if err != nil {
return storage.Filesystem{}, errors.Trace(err)
}
var volumeTag names.VolumeTag
if in.VolumeTag != "" {
volumeTag, err = names.ParseVolumeTag(in.VolumeTag)
if err != nil {
return storage.Filesystem{}, errors.Trace(err)
}
}
return storage.Filesystem{
filesystemTag,
volumeTag,
storage.FilesystemInfo{
in.Info.FilesystemId,
in.Info.Size,
},
}, nil
}
func filesystemParamsFromParams(in params.FilesystemParams) (storage.FilesystemParams, error) {
filesystemTag, err := names.ParseFilesystemTag(in.FilesystemTag)
if err != nil {
return storage.FilesystemParams{}, errors.Trace(err)
}
var volumeTag names.VolumeTag
if in.VolumeTag != "" {
volumeTag, err = names.ParseVolumeTag(in.VolumeTag)
if err != nil {
return storage.FilesystemParams{}, errors.Trace(err)
}
}
providerType := storage.ProviderType(in.Provider)
return storage.FilesystemParams{
filesystemTag,
volumeTag,
in.Size,
providerType,
in.Attributes,
in.Tags,
}, nil
}
func filesystemAttachmentParamsFromParams(in params.FilesystemAttachmentParams) (storage.FilesystemAttachmentParams, error) {
machineTag, err := names.ParseMachineTag(in.MachineTag)
if err != nil {
return storage.FilesystemAttachmentParams{}, errors.Trace(err)
}
filesystemTag, err := names.ParseFilesystemTag(in.FilesystemTag)
if err != nil {
return storage.FilesystemAttachmentParams{}, errors.Trace(err)
}
return storage.FilesystemAttachmentParams{
AttachmentParams: storage.AttachmentParams{
Provider: storage.ProviderType(in.Provider),
Machine: machineTag,
InstanceId: instance.Id(in.InstanceId),
ReadOnly: in.ReadOnly,
},
Filesystem: filesystemTag,
FilesystemId: in.FilesystemId,
Path: in.MountPoint,
}, nil
}