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Refactor duplicate code for grouping snapshots

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This commit is a followup to the addition of the --group-by flag for the
snapshots command. Adding the grouping code there introduced duplicated
code (the forget command also does grouping). This commit refactors
boths sides to only use shared code.
This commit is contained in:
Jan Niklas Richter 2019-01-04 19:24:03 +01:00 committed by Alexander Neumann
parent 3d5a0c799b
commit 733519d895
3 changed files with 171 additions and 213 deletions
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232
cmd/restic/cmd_forget.go
View file

@ -4,10 +4,7 @@ import (
"context"
"encoding/json"
"io"
"sort"
"strings"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/restic"
"github.com/spf13/cobra"
)
@ -91,178 +88,129 @@ func runForget(opts ForgetOptions, gopts GlobalOptions, args []string) error {
return err
}
// group by hostname and dirs
type key struct {
Hostname string
Paths []string
Tags []string
}
snapshotGroups := make(map[string]restic.Snapshots)
var GroupByTag bool
var GroupByHost bool
var GroupByPath bool
var GroupOptionList []string
GroupOptionList = strings.Split(opts.GroupBy, ",")
for _, option := range GroupOptionList {
switch option {
case "host":
GroupByHost = true
case "paths":
GroupByPath = true
case "tags":
GroupByTag = true
case "":
default:
return errors.Fatal("unknown grouping option: '" + option + "'")
}
}
removeSnapshots := 0
ctx, cancel := context.WithCancel(gopts.ctx)
defer cancel()
var snapshots restic.Snapshots
for sn := range FindFilteredSnapshots(ctx, repo, opts.Host, opts.Tags, opts.Paths, args) {
if len(args) > 0 {
// When explicit snapshots args are given, remove them immediately.
snapshots = append(snapshots, sn)
}
if len(args) > 0 {
// When explicit snapshots args are given, remove them immediately.
for _, sn := range snapshots {
if !opts.DryRun {
h := restic.Handle{Type: restic.SnapshotFile, Name: sn.ID().String()}
if err = repo.Backend().Remove(gopts.ctx, h); err != nil {
return err
}
Verbosef("removed snapshot %v\n", sn.ID().Str())
if !gopts.JSON {
Verbosef("removed snapshot %v\n", sn.ID().Str())
}
removeSnapshots++
} else {
Verbosef("would have removed snapshot %v\n", sn.ID().Str())
if !gopts.JSON {
Verbosef("would have removed snapshot %v\n", sn.ID().Str())
}
}
} else {
// Determining grouping-keys
var tags []string
var hostname string
var paths []string
if GroupByTag {
tags = sn.Tags
sort.StringSlice(tags).Sort()
}
if GroupByHost {
hostname = sn.Hostname
}
if GroupByPath {
paths = sn.Paths
}
sort.StringSlice(sn.Paths).Sort()
var k []byte
var err error
k, err = json.Marshal(key{Tags: tags, Hostname: hostname, Paths: paths})
if err != nil {
return err
}
snapshotGroups[string(k)] = append(snapshotGroups[string(k)], sn)
}
}
policy := restic.ExpirePolicy{
Last: opts.Last,
Hourly: opts.Hourly,
Daily: opts.Daily,
Weekly: opts.Weekly,
Monthly: opts.Monthly,
Yearly: opts.Yearly,
Within: opts.Within,
Tags: opts.KeepTags,
}
if policy.Empty() && len(args) == 0 {
Verbosef("no policy was specified, no snapshots will be removed\n")
}
if !policy.Empty() {
if !gopts.JSON {
Verbosef("Applying Policy: %v\n", policy)
} else {
snapshotGroups, _, err := restic.GroupSnapshots(snapshots, opts.GroupBy)
if err != nil {
return err
}
var jsonGroups []*ForgetGroup
policy := restic.ExpirePolicy{
Last: opts.Last,
Hourly: opts.Hourly,
Daily: opts.Daily,
Weekly: opts.Weekly,
Monthly: opts.Monthly,
Yearly: opts.Yearly,
Within: opts.Within,
Tags: opts.KeepTags,
}
for k, snapshotGroup := range snapshotGroups {
var key key
if json.Unmarshal([]byte(k), &key) != nil {
return err
}
var fg ForgetGroup
// Info
if policy.Empty() && len(args) == 0 {
if !gopts.JSON {
Verbosef("snapshots")
}
var infoStrings []string
if GroupByTag {
infoStrings = append(infoStrings, "tags ["+strings.Join(key.Tags, ", ")+"]")
fg.Tags = key.Tags
}
if GroupByHost {
infoStrings = append(infoStrings, "host ["+key.Hostname+"]")
fg.Host = key.Hostname
}
if GroupByPath {
infoStrings = append(infoStrings, "paths ["+strings.Join(key.Paths, ", ")+"]")
fg.Paths = key.Paths
}
if infoStrings != nil && !gopts.JSON {
Verbosef(" for (" + strings.Join(infoStrings, ", ") + ")")
Verbosef("no policy was specified, no snapshots will be removed\n")
}
}
if !policy.Empty() {
if !gopts.JSON {
Verbosef(":\n\n")
Verbosef("Applying Policy: %v\n", policy)
}
keep, remove, reasons := restic.ApplyPolicy(snapshotGroup, policy)
var jsonGroups []*ForgetGroup
if len(keep) != 0 && !gopts.Quiet && !gopts.JSON {
Printf("keep %d snapshots:\n", len(keep))
PrintSnapshots(globalOptions.stdout, keep, reasons, opts.Compact)
Printf("\n")
}
addJSONSnapshots(&fg.Keep, keep)
if len(remove) != 0 && !gopts.Quiet && !gopts.JSON {
Printf("remove %d snapshots:\n", len(remove))
PrintSnapshots(globalOptions.stdout, remove, nil, opts.Compact)
Printf("\n")
}
addJSONSnapshots(&fg.Remove, remove)
fg.Reasons = reasons
jsonGroups = append(jsonGroups, &fg)
removeSnapshots += len(remove)
if !opts.DryRun {
for _, sn := range remove {
h := restic.Handle{Type: restic.SnapshotFile, Name: sn.ID().String()}
err = repo.Backend().Remove(gopts.ctx, h)
for k, snapshotGroup := range snapshotGroups {
if gopts.Verbose >= 1 && !gopts.JSON {
err = PrintSnapshotGroupHeader(gopts.stdout, k)
if err != nil {
return err
}
}
}
}
if gopts.JSON {
err = printJSONForget(gopts.stdout, jsonGroups)
if err != nil {
return err
var key restic.SnapshotGroupKey
if json.Unmarshal([]byte(k), &key) != nil {
return err
}
var fg ForgetGroup
fg.Tags = key.Tags
fg.Host = key.Hostname
fg.Paths = key.Paths
keep, remove, reasons := restic.ApplyPolicy(snapshotGroup, policy)
if len(keep) != 0 && !gopts.Quiet && !gopts.JSON {
Printf("keep %d snapshots:\n", len(keep))
PrintSnapshots(globalOptions.stdout, keep, reasons, opts.Compact)
Printf("\n")
}
addJSONSnapshots(&fg.Keep, keep)
if len(remove) != 0 && !gopts.Quiet && !gopts.JSON {
Printf("remove %d snapshots:\n", len(remove))
PrintSnapshots(globalOptions.stdout, remove, nil, opts.Compact)
Printf("\n")
}
addJSONSnapshots(&fg.Remove, remove)
fg.Reasons = reasons
jsonGroups = append(jsonGroups, &fg)
removeSnapshots += len(remove)
if !opts.DryRun {
for _, sn := range remove {
h := restic.Handle{Type: restic.SnapshotFile, Name: sn.ID().String()}
err = repo.Backend().Remove(gopts.ctx, h)
if err != nil {
return err
}
}
}
}
if gopts.JSON {
err = printJSONForget(gopts.stdout, jsonGroups)
if err != nil {
return err
}
}
}
}
if removeSnapshots > 0 && opts.Prune {
Verbosef("%d snapshots have been removed, running prune\n", removeSnapshots)
if !gopts.JSON {
Verbosef("%d snapshots have been removed, running prune\n", removeSnapshots)
}
if !opts.DryRun {
return pruneRepository(gopts, repo)
}

76
cmd/restic/cmd_snapshots.go
View file

@ -8,7 +8,6 @@ import (
"sort"
"strings"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/ui/table"
"github.com/spf13/cobra"
@ -50,12 +49,6 @@ func init() {
f.StringVarP(&snapshotOptions.GroupBy, "group-by", "g", "", "string for grouping snapshots by host,paths,tags")
}
type groupKey struct {
Hostname string `json:"hostname"`
Paths []string `json:"paths"`
Tags []string `json:"tags"`
}
func runSnapshots(opts SnapshotOptions, gopts GlobalOptions, args []string) error {
repo, err := OpenRepository(gopts)
if err != nil {
@ -77,7 +70,7 @@ func runSnapshots(opts SnapshotOptions, gopts GlobalOptions, args []string) erro
for sn := range FindFilteredSnapshots(ctx, repo, opts.Host, opts.Tags, opts.Paths, args) {
snapshots = append(snapshots, sn)
}
snapshotGroups, grouped, err := GroupSnapshots(snapshots, opts.GroupBy)
snapshotGroups, grouped, err := restic.GroupSnapshots(snapshots, opts.GroupBy)
if err != nil {
return err
}
@ -148,65 +141,6 @@ func FilterLastSnapshots(list restic.Snapshots) restic.Snapshots {
return results
}
// GroupSnapshots takes a list of snapshots and a grouping criteria and creates
// a group list of snapshots.
func GroupSnapshots(snapshots restic.Snapshots, options string) (map[string]restic.Snapshots, bool, error) {
// group by hostname and dirs
snapshotGroups := make(map[string]restic.Snapshots)
var GroupByTag bool
var GroupByHost bool
var GroupByPath bool
var GroupOptionList []string
GroupOptionList = strings.Split(options, ",")
for _, option := range GroupOptionList {
switch option {
case "host":
GroupByHost = true
case "paths":
GroupByPath = true
case "tags":
GroupByTag = true
case "":
default:
return nil, false, errors.Fatal("unknown grouping option: '" + option + "'")
}
}
for _, sn := range snapshots {
// Determining grouping-keys
var tags []string
var hostname string
var paths []string
if GroupByTag {
tags = sn.Tags
sort.StringSlice(tags).Sort()
}
if GroupByHost {
hostname = sn.Hostname
}
if GroupByPath {
paths = sn.Paths
}
sort.StringSlice(sn.Paths).Sort()
var k []byte
var err error
k, err = json.Marshal(groupKey{Tags: tags, Hostname: hostname, Paths: paths})
if err != nil {
return nil, false, err
}
snapshotGroups[string(k)] = append(snapshotGroups[string(k)], sn)
}
return snapshotGroups, GroupByTag || GroupByHost || GroupByPath, nil
}
// PrintSnapshots prints a text table of the snapshots in list to stdout.
func PrintSnapshots(stdout io.Writer, list restic.Snapshots, reasons []restic.KeepReason, compact bool) {
// keep the reasons a snasphot is being kept in a map, so that it doesn't
@ -311,7 +245,7 @@ func PrintSnapshots(stdout io.Writer, list restic.Snapshots, reasons []restic.Ke
// following snapshots belong to.
// Prints nothing, if we did not group at all.
func PrintSnapshotGroupHeader(stdout io.Writer, groupKeyJSON string) error {
var key groupKey
var key restic.SnapshotGroupKey
var err error
err = json.Unmarshal([]byte(groupKeyJSON), &key)
@ -353,8 +287,8 @@ type Snapshot struct {
// SnapshotGroup helps to print SnaphotGroups as JSON with their GroupReasons included.
type SnapshotGroup struct {
GroupKey groupKey `json:"group_key"`
Snapshots []Snapshot `json:"snapshots"`
GroupKey restic.SnapshotGroupKey `json:"group_key"`
Snapshots []Snapshot `json:"snapshots"`
}
// printSnapshotsJSON writes the JSON representation of list to stdout.
@ -363,7 +297,7 @@ func printSnapshotGroupJSON(stdout io.Writer, snGroups map[string]restic.Snapsho
var snapshotGroups []SnapshotGroup
for k, list := range snGroups {
var key groupKey
var key restic.SnapshotGroupKey
var err error
var snapshots []Snapshot

76
internal/restic/snapshot_group.go Normal file
View file

@ -0,0 +1,76 @@
package restic
import (
"encoding/json"
"sort"
"strings"
"github.com/restic/restic/internal/errors"
)
// SnapshotGroupKey is the structure for identifying groups in a grouped
// snapshot list. This is used by GroupSnapshots()
type SnapshotGroupKey struct {
Hostname string `json:"hostname"`
Paths []string `json:"paths"`
Tags []string `json:"tags"`
}
// GroupSnapshots takes a list of snapshots and a grouping criteria and creates
// a group list of snapshots.
func GroupSnapshots(snapshots Snapshots, options string) (map[string]Snapshots, bool, error) {
// group by hostname and dirs
snapshotGroups := make(map[string]Snapshots)
var GroupByTag bool
var GroupByHost bool
var GroupByPath bool
var GroupOptionList []string
GroupOptionList = strings.Split(options, ",")
for _, option := range GroupOptionList {
switch option {
case "host":
GroupByHost = true
case "paths":
GroupByPath = true
case "tags":
GroupByTag = true
case "":
default:
return nil, false, errors.Fatal("unknown grouping option: '" + option + "'")
}
}
for _, sn := range snapshots {
// Determining grouping-keys
var tags []string
var hostname string
var paths []string
if GroupByTag {
tags = sn.Tags
sort.StringSlice(tags).Sort()
}
if GroupByHost {
hostname = sn.Hostname
}
if GroupByPath {
paths = sn.Paths
}
sort.StringSlice(sn.Paths).Sort()
var k []byte
var err error
k, err = json.Marshal(SnapshotGroupKey{Tags: tags, Hostname: hostname, Paths: paths})
if err != nil {
return nil, false, err
}
snapshotGroups[string(k)] = append(snapshotGroups[string(k)], sn)
}
return snapshotGroups, GroupByTag || GroupByHost || GroupByPath, nil
}