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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package storage
import (
"bytes"
"fmt"
"sort"
"strings"
"text/tabwriter"
"github.com/dustin/go-humanize"
"github.com/juju/errors"
)
// formatVolumeListTabular returns a tabular summary of volume instances.
func formatVolumeListTabular(value interface{}) ([]byte, error) {
infos, ok := value.(map[string]VolumeInfo)
if !ok {
return nil, errors.Errorf("expected value of type %T, got %T", infos, value)
}
return formatVolumeListTabularTyped(infos), nil
}
func formatVolumeListTabularTyped(infos map[string]VolumeInfo) []byte {
var out bytes.Buffer
const (
// To format things into columns.
minwidth = 0
tabwidth = 1
padding = 2
padchar = ' '
flags = 0
)
tw := tabwriter.NewWriter(&out, minwidth, tabwidth, padding, padchar, flags)
print := func(values ...string) {
fmt.Fprintln(tw, strings.Join(values, "\t"))
}
print("MACHINE", "UNIT", "STORAGE", "ID", "PROVIDER-ID", "DEVICE", "SIZE", "STATE", "MESSAGE")
volumeAttachmentInfos := make(volumeAttachmentInfos, 0, len(infos))
for volumeId, info := range infos {
volumeAttachmentInfo := volumeAttachmentInfo{
VolumeId: volumeId,
VolumeInfo: info,
}
if info.Attachments == nil {
volumeAttachmentInfos = append(volumeAttachmentInfos, volumeAttachmentInfo)
continue
}
// Each unit attachment must have a corresponding volume
// attachment. Enumerate each of the volume attachments,
// and locate the corresponding unit attachment if any.
// Each volume attachment has at most one corresponding
// unit attachment.
for machineId, machineInfo := range info.Attachments.Machines {
volumeAttachmentInfo := volumeAttachmentInfo
volumeAttachmentInfo.MachineId = machineId
volumeAttachmentInfo.MachineVolumeAttachment = machineInfo
for unitId, unitInfo := range info.Attachments.Units {
if unitInfo.MachineId == machineId {
volumeAttachmentInfo.UnitId = unitId
volumeAttachmentInfo.UnitStorageAttachment = unitInfo
break
}
}
volumeAttachmentInfos = append(volumeAttachmentInfos, volumeAttachmentInfo)
}
}
sort.Sort(volumeAttachmentInfos)
for _, info := range volumeAttachmentInfos {
var size string
if info.Size > 0 {
size = humanize.IBytes(info.Size * humanize.MiByte)
}
print(
info.MachineId, info.UnitId, info.Storage,
info.VolumeId, info.ProviderVolumeId,
info.DeviceName, size,
string(info.Status.Current), info.Status.Message,
)
}
tw.Flush()
return out.Bytes()
}
type volumeAttachmentInfo struct {
VolumeId string
VolumeInfo
MachineId string
MachineVolumeAttachment
UnitId string
UnitStorageAttachment
}
type volumeAttachmentInfos []volumeAttachmentInfo
func (v volumeAttachmentInfos) Len() int {
return len(v)
}
func (v volumeAttachmentInfos) Swap(i, j int) {
v[i], v[j] = v[j], v[i]
}
func (v volumeAttachmentInfos) Less(i, j int) bool {
switch compareStrings(v[i].MachineId, v[j].MachineId) {
case -1:
return true
case 1:
return false
}
switch compareSlashSeparated(v[i].UnitId, v[j].UnitId) {
case -1:
return true
case 1:
return false
}
switch compareSlashSeparated(v[i].Storage, v[j].Storage) {
case -1:
return true
case 1:
return false
}
return v[i].VolumeId < v[j].VolumeId
}
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