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restic/internal/repository/master_index.go

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package repository
import (
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"context"
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"sync"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/debug"
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)
// MasterIndex is a collection of indexes and IDs of chunks that are in the process of being saved.
type MasterIndex struct {
idx []*Index
pendingBlobs restic.BlobSet
idxMutex sync.RWMutex
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}
// NewMasterIndex creates a new master index.
func NewMasterIndex() *MasterIndex {
// Always add an empty final index, such that MergeFinalIndexes can merge into this.
// Note that removing this index could lead to a race condition in the rare
// sitation that only two indexes exist which are saved and merged concurrently.
idx := []*Index{NewIndex()}
idx[0].Finalize()
return &MasterIndex{idx: idx, pendingBlobs: restic.NewBlobSet()}
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}
// Lookup queries all known Indexes for the ID and returns all matches.
func (mi *MasterIndex) Lookup(id restic.ID, tpe restic.BlobType) (blobs []restic.PackedBlob) {
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mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
for _, idx := range mi.idx {
blobs = idx.Lookup(id, tpe, blobs)
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}
return blobs
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}
// LookupSize queries all known Indexes for the ID and returns the first match.
func (mi *MasterIndex) LookupSize(id restic.ID, tpe restic.BlobType) (uint, bool) {
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mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
for _, idx := range mi.idx {
if size, found := idx.LookupSize(id, tpe); found {
return size, found
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}
}
return 0, false
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}
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// 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.
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func (mi *MasterIndex) ListPack(id restic.ID) (list []restic.PackedBlob) {
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mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
for _, idx := range mi.idx {
list := idx.ListPack(id)
if len(list) > 0 {
return list
}
}
return nil
}
// AddPending adds a given blob to list of pending Blobs
// Before doing so it checks if this blob is already known.
// Returns true if adding was successful and false if the blob
// was already known
func (mi *MasterIndex) addPending(id restic.ID, tpe restic.BlobType) bool {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
// Check if blob is pending or in index
if mi.pendingBlobs.Has(restic.BlobHandle{ID: id, Type: tpe}) {
return false
}
for _, idx := range mi.idx {
if idx.Has(id, tpe) {
return false
}
}
// really not known -> insert
mi.pendingBlobs.Insert(restic.BlobHandle{ID: id, Type: tpe})
return true
}
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// Has queries all known Indexes for the ID and returns the first match.
// Also returns true if the ID is pending.
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func (mi *MasterIndex) Has(id restic.ID, tpe restic.BlobType) bool {
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mi.idxMutex.RLock()
defer mi.idxMutex.RUnlock()
// also return true if blob is pending
if mi.pendingBlobs.Has(restic.BlobHandle{ID: id, Type: tpe}) {
return true
}
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for _, idx := range mi.idx {
if idx.Has(id, tpe) {
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return true
}
}
return false
}
// Count returns the number of blobs of type t in the index.
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func (mi *MasterIndex) Count(t restic.BlobType) (n uint) {
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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)
}
// StorePack remembers the id and pack in the index.
func (mi *MasterIndex) StorePack(id restic.ID, blobs []restic.Blob) {
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mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
// delete blobs from pending
for _, blob := range blobs {
mi.pendingBlobs.Delete(restic.BlobHandle{Type: blob.Type, ID: blob.ID})
}
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for _, idx := range mi.idx {
if !idx.Final() {
idx.StorePack(id, blobs)
return
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}
}
newIdx := NewIndex()
newIdx.StorePack(id, blobs)
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mi.idx = append(mi.idx, newIdx)
}
// FinalizeNotFinalIndexes finalizes all indexes that
// have not yet been saved and returns that list
func (mi *MasterIndex) FinalizeNotFinalIndexes() []*Index {
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mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
var list []*Index
for _, idx := range mi.idx {
if !idx.Final() {
idx.Finalize()
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list = append(list, idx)
}
}
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debug.Log("return %d indexes", len(list))
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return list
}
// FinalizeFullIndexes finalizes all indexes that are full and returns that list.
func (mi *MasterIndex) FinalizeFullIndexes() []*Index {
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mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
var list []*Index
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debug.Log("checking %d indexes", len(mi.idx))
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for _, idx := range mi.idx {
if idx.Final() {
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debug.Log("index %p is final", idx)
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continue
}
if IndexFull(idx) {
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debug.Log("index %p is full", idx)
idx.Finalize()
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list = append(list, idx)
} else {
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debug.Log("index %p not full", idx)
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}
}
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debug.Log("return %d indexes", len(list))
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return list
}
// All returns all indexes.
func (mi *MasterIndex) All() []*Index {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
return mi.idx
}
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// Each returns a channel that yields all blobs known to the index. When the
// context is cancelled, the background goroutine terminates. This blocks any
// modification of the index.
func (mi *MasterIndex) Each(ctx context.Context) <-chan restic.PackedBlob {
mi.idxMutex.RLock()
ch := make(chan restic.PackedBlob)
go func() {
defer mi.idxMutex.RUnlock()
defer func() {
close(ch)
}()
for _, idx := range mi.idx {
idxCh := idx.Each(ctx)
for pb := range idxCh {
select {
case <-ctx.Done():
return
case ch <- pb:
}
}
}
}()
return ch
}
// MergeFinalIndexes merges all final indexes together.
// After calling, there will be only one big final index in MasterIndex
// containing all final index contents.
// Indexes that are not final are left untouched.
// This merging can only be called after all index files are loaded - as
// removing of superseded index contents is only possible for unmerged indexes.
func (mi *MasterIndex) MergeFinalIndexes() {
mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
// The first index is always final and the one to merge into
newIdx := mi.idx[:1]
for i := 1; i < len(mi.idx); i++ {
idx := mi.idx[i]
// clear reference in masterindex as it may become stale
mi.idx[i] = nil
if !idx.Final() {
newIdx = append(newIdx, idx)
} else {
mi.idx[0].merge(idx)
}
}
mi.idx = newIdx
}
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// 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.
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func (mi *MasterIndex) RebuildIndex(packBlacklist restic.IDSet) (*Index, error) {
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mi.idxMutex.Lock()
defer mi.idxMutex.Unlock()
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debug.Log("start rebuilding index of %d indexes, pack blacklist: %v", len(mi.idx), packBlacklist)
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newIndex := NewIndex()
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ctx, cancel := context.WithCancel(context.TODO())
defer cancel()
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for i, idx := range mi.idx {
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debug.Log("adding index %d", i)
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for pb := range idx.Each(ctx) {
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if packBlacklist.Has(pb.PackID) {
continue
}
newIndex.Store(pb)
}
if !idx.Final() {
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debug.Log("index %d isn't final, don't add to supersedes field", i)
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continue
}
ids, err := idx.IDs()
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if err != nil {
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debug.Log("index %d does not have an ID: %v", err)
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return nil, err
}
debug.Log("adding index ids %v to supersedes field", ids)
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err = newIndex.AddToSupersedes(ids...)
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if err != nil {
return nil, err
}
}
return newIndex, nil
}