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disk_deployer.go
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disk_deployer.go
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package vm
import (
"fmt"
bicloud "github.com/cloudfoundry/bosh-cli/cloud"
biconfig "github.com/cloudfoundry/bosh-cli/config"
bidisk "github.com/cloudfoundry/bosh-cli/deployment/disk"
bideplmanifest "github.com/cloudfoundry/bosh-cli/deployment/manifest"
biui "github.com/cloudfoundry/bosh-cli/ui"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
boshlog "github.com/cloudfoundry/bosh-utils/logger"
)
// DiskDeployer is in the vm package to avoid a [disk -> vm -> disk] dependency cycle
type DiskDeployer interface {
Deploy(diskPool bideplmanifest.DiskPool, cloud bicloud.Cloud, vm VM, eventLoggerStage biui.Stage) ([]bidisk.Disk, error)
}
type diskDeployer struct {
diskRepo biconfig.DiskRepo
diskManagerFactory bidisk.ManagerFactory
diskManager bidisk.Manager
logger boshlog.Logger
logTag string
}
func NewDiskDeployer(diskManagerFactory bidisk.ManagerFactory, diskRepo biconfig.DiskRepo, logger boshlog.Logger) DiskDeployer {
return &diskDeployer{
diskManagerFactory: diskManagerFactory,
diskRepo: diskRepo,
logger: logger,
logTag: "diskDeployer",
}
}
func (d *diskDeployer) Deploy(diskPool bideplmanifest.DiskPool, cloud bicloud.Cloud, vm VM, stage biui.Stage) ([]bidisk.Disk, error) {
if diskPool.DiskSize == 0 {
return []bidisk.Disk{}, nil
}
d.diskManager = d.diskManagerFactory.NewManager(cloud)
disks, err := d.diskManager.FindCurrent()
if err != nil {
return disks, bosherr.WrapError(err, "Finding existing disk")
}
if len(disks) > 1 {
return disks, bosherr.WrapError(err, "Multiple current disks not supported")
} else if len(disks) == 1 {
disks, err = d.deployExistingDisk(disks[0], diskPool, vm, stage)
if err != nil {
return disks, err
}
} else {
disks, err = d.deployNewDisk(diskPool, vm, stage)
if err != nil {
return disks, err
}
}
err = d.diskManager.DeleteUnused(stage)
if err != nil {
return disks, err
}
return disks, nil
}
func (d *diskDeployer) deployExistingDisk(disk bidisk.Disk, diskPool bideplmanifest.DiskPool, vm VM, stage biui.Stage) ([]bidisk.Disk, error) {
disks := []bidisk.Disk{}
// the disk is already part of the deployment, and should already be attached
disks = append(disks, disk)
// attach is idempotent
err := d.attachDisk(disk, vm, stage)
if err != nil {
return disks, err
}
if disk.NeedsMigration(diskPool.DiskSize, diskPool.CloudProperties) {
disk, err = d.migrateDisk(disk, diskPool, vm, stage)
if err != nil {
return disks, err
}
// after migration, only the new disk is part of the deployment
disks[0] = disk
}
return disks, nil
}
func (d *diskDeployer) deployNewDisk(diskPool bideplmanifest.DiskPool, vm VM, stage biui.Stage) ([]bidisk.Disk, error) {
disks := []bidisk.Disk{}
disk, err := d.createDisk(diskPool, vm, stage)
if err != nil {
return disks, err
}
err = d.attachDisk(disk, vm, stage)
if err != nil {
return disks, err
}
// once attached, the disk is part of the deployment
disks = append(disks, disk)
err = d.updateCurrentDiskRecord(disk)
if err != nil {
return disks, err
}
return disks, nil
}
func (d *diskDeployer) migrateDisk(
originalDisk bidisk.Disk,
diskPool bideplmanifest.DiskPool,
vm VM,
stage biui.Stage,
) (newDisk bidisk.Disk, err error) {
d.logger.Debug(d.logTag, "Migrating disk '%s'", originalDisk.CID())
err = stage.Perform("Creating disk", func() error {
newDisk, err = d.diskManager.Create(diskPool, vm.CID())
return err
})
if err != nil {
return newDisk, err
}
stageName := fmt.Sprintf("Attaching disk '%s' to VM '%s'", newDisk.CID(), vm.CID())
err = stage.Perform(stageName, func() error {
return vm.AttachDisk(newDisk)
})
if err != nil {
return newDisk, err
}
stageName = fmt.Sprintf("Migrating disk content from '%s' to '%s'", originalDisk.CID(), newDisk.CID())
err = stage.Perform(stageName, func() error {
return vm.MigrateDisk()
})
if err != nil {
return newDisk, err
}
err = d.updateCurrentDiskRecord(newDisk)
if err != nil {
return newDisk, err
}
stageName = fmt.Sprintf("Detaching disk '%s'", originalDisk.CID())
err = stage.Perform(stageName, func() error {
return vm.DetachDisk(originalDisk)
})
if err != nil {
return newDisk, err
}
stageName = fmt.Sprintf("Deleting disk '%s'", originalDisk.CID())
err = stage.Perform(stageName, func() error {
return originalDisk.Delete()
})
if err != nil {
return newDisk, err
}
return newDisk, nil
}
func (d *diskDeployer) updateCurrentDiskRecord(disk bidisk.Disk) error {
savedDiskRecord, found, err := d.diskRepo.Find(disk.CID())
if err != nil {
return bosherr.WrapError(err, "Finding disk record")
}
if !found {
return bosherr.Error("Failed to find disk record for new disk")
}
err = d.diskRepo.UpdateCurrent(savedDiskRecord.ID)
if err != nil {
return bosherr.WrapError(err, "Updating current disk record")
}
return nil
}
func (d *diskDeployer) createDisk(diskPool bideplmanifest.DiskPool, vm VM, stage biui.Stage) (disk bidisk.Disk, err error) {
err = stage.Perform("Creating disk", func() error {
disk, err = d.diskManager.Create(diskPool, vm.CID())
return err
})
return disk, err
}
func (d *diskDeployer) attachDisk(disk bidisk.Disk, vm VM, stage biui.Stage) error {
stageName := fmt.Sprintf("Attaching disk '%s' to VM '%s'", disk.CID(), vm.CID())
err := stage.Perform(stageName, func() error {
return vm.AttachDisk(disk)
})
return err
}