restic/repository/master_index.go

241 lines
5.5 KiB
Go

package repository
import (
"fmt"
"sync"
"github.com/restic/restic/backend"
"github.com/restic/restic/debug"
"github.com/restic/restic/pack"
)
// MasterIndex is a collection of indexes and IDs of chunks that are in the process of being saved.
type MasterIndex struct {
idx []*Index
idxMutex sync.RWMutex
}
// NewMasterIndex creates a new master index.
func NewMasterIndex() *MasterIndex {
return &MasterIndex{}
}
// Lookup queries all known Indexes for the ID and returns the first match.
func (mi *MasterIndex) Lookup(id backend.ID) (blob PackedBlob, err error) {
mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
debug.Log("MasterIndex.Lookup", "looking up id %v", id.Str())
for _, idx := range mi.idx {
blob, err = idx.Lookup(id)
if err == nil {
debug.Log("MasterIndex.Lookup",
"found id %v: %v", id.Str(), blob)
return
}
}
debug.Log("MasterIndex.Lookup", "id %v not found in any index", id.Str())
return PackedBlob{}, fmt.Errorf("id %v not found in any index", id)
}
// LookupSize queries all known Indexes for the ID and returns the first match.
func (mi *MasterIndex) LookupSize(id backend.ID) (uint, error) {
mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
for _, idx := range mi.idx {
length, err := idx.LookupSize(id)
if err == nil {
return length, nil
}
}
return 0, fmt.Errorf("id %v not found in any index", id)
}
// ListPack returns the list of blobs in a pack. The first matching index is
// returned, or nil if no index contains information about the pack id.
func (mi *MasterIndex) ListPack(id backend.ID) (list []PackedBlob) {
mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
for _, idx := range mi.idx {
list := idx.ListPack(id)
if len(list) > 0 {
return list
}
}
return nil
}
// Has queries all known Indexes for the ID and returns the first match.
func (mi *MasterIndex) Has(id backend.ID) bool {
mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
for _, idx := range mi.idx {
if idx.Has(id) {
return true
}
}
return false
}
// Count returns the number of blobs of type t in the index.
func (mi *MasterIndex) Count(t pack.BlobType) (n uint) {
mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
var sum uint
for _, idx := range mi.idx {
sum += idx.Count(t)
}
return sum
}
// Insert adds a new index to the MasterIndex.
func (mi *MasterIndex) Insert(idx *Index) {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
mi.idx = append(mi.idx, idx)
}
// Remove deletes an index from the MasterIndex.
func (mi *MasterIndex) Remove(index *Index) {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
for i, idx := range mi.idx {
if idx == index {
mi.idx = append(mi.idx[:i], mi.idx[i+1:]...)
return
}
}
}
// Current returns an index that is not yet finalized, so that new entries can
// still be added. If all indexes are finalized, a new index is created and
// returned.
func (mi *MasterIndex) Current() *Index {
mi.idxMutex.RLock()
for _, idx := range mi.idx {
if !idx.Final() {
mi.idxMutex.RUnlock()
return idx
}
}
mi.idxMutex.RUnlock()
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
newIdx := NewIndex()
mi.idx = append(mi.idx, newIdx)
return newIdx
}
// NotFinalIndexes returns all indexes that have not yet been saved.
func (mi *MasterIndex) NotFinalIndexes() []*Index {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
var list []*Index
for _, idx := range mi.idx {
if !idx.Final() {
list = append(list, idx)
}
}
debug.Log("MasterIndex.NotFinalIndexes", "return %d indexes", len(list))
return list
}
// FullIndexes returns all indexes that are full.
func (mi *MasterIndex) FullIndexes() []*Index {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
var list []*Index
debug.Log("MasterIndex.FullIndexes", "checking %d indexes", len(mi.idx))
for _, idx := range mi.idx {
if idx.Final() {
debug.Log("MasterIndex.FullIndexes", "index %p is final", idx)
continue
}
if IndexFull(idx) {
debug.Log("MasterIndex.FullIndexes", "index %p is full", idx)
list = append(list, idx)
} else {
debug.Log("MasterIndex.FullIndexes", "index %p not full", idx)
}
}
debug.Log("MasterIndex.FullIndexes", "return %d indexes", len(list))
return list
}
// All returns all indexes.
func (mi *MasterIndex) All() []*Index {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
return mi.idx
}
// RebuildIndex combines all known indexes to a new index, leaving out any
// packs whose ID is contained in packBlacklist. The new index contains the IDs
// of all known indexes in the "supersedes" field.
func (mi *MasterIndex) RebuildIndex(packBlacklist backend.IDSet) (*Index, error) {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
debug.Log("MasterIndex.RebuildIndex", "start rebuilding index of %d indexes, pack blacklist: %v", len(mi.idx), packBlacklist)
newIndex := NewIndex()
done := make(chan struct{})
defer close(done)
for i, idx := range mi.idx {
debug.Log("MasterIndex.RebuildIndex", "adding index %d", i)
for pb := range idx.Each(done) {
if packBlacklist.Has(pb.PackID) {
continue
}
newIndex.Store(pb)
}
if !idx.Final() {
debug.Log("MasterIndex.RebuildIndex", "index %d isn't final, don't add to supersedes field", i)
continue
}
id, err := idx.ID()
if err != nil {
debug.Log("MasterIndex.RebuildIndex", "index %d does not have an ID: %v", err)
return nil, err
}
debug.Log("MasterIndex.RebuildIndex", "adding index id %v to supersedes field", id.Str())
err = newIndex.AddToSupersedes(id)
if err != nil {
return nil, err
}
}
return newIndex, nil
}