mirror of
https://github.com/restic/restic.git
synced 2024-08-27 06:37:24 +02:00
267 lines
5.7 KiB
Go
267 lines
5.7 KiB
Go
package repository
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import (
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"context"
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"sync"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/debug"
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)
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// MasterIndex is a collection of indexes and IDs of chunks that are in the process of being saved.
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type MasterIndex struct {
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idx []*Index
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idxMutex sync.RWMutex
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}
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// NewMasterIndex creates a new master index.
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func NewMasterIndex() *MasterIndex {
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return &MasterIndex{}
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}
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// Lookup queries all known Indexes for the ID and returns the first match.
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func (mi *MasterIndex) Lookup(id restic.ID, tpe restic.BlobType) (blobs []restic.PackedBlob, err error) {
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mi.idxMutex.RLock()
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defer mi.idxMutex.RUnlock()
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debug.Log("looking up id %v, tpe %v", id.Str(), tpe)
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for _, idx := range mi.idx {
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blobs, err = idx.Lookup(id, tpe)
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if err == nil {
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debug.Log("found id %v: %v", id.Str(), blobs)
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return
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}
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}
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debug.Log("id %v not found in any index", id.Str())
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return nil, errors.Errorf("id %v not found in any index", id)
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}
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// LookupSize queries all known Indexes for the ID and returns the first match.
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func (mi *MasterIndex) LookupSize(id restic.ID, tpe restic.BlobType) (uint, error) {
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mi.idxMutex.RLock()
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defer mi.idxMutex.RUnlock()
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for _, idx := range mi.idx {
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if idx.Has(id, tpe) {
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return idx.LookupSize(id, tpe)
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}
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}
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return 0, errors.Errorf("id %v not found in any index", id)
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}
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// ListPack returns the list of blobs in a pack. The first matching index is
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// 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()
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defer mi.idxMutex.RUnlock()
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for _, idx := range mi.idx {
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list := idx.ListPack(id)
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if len(list) > 0 {
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return list
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}
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}
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return nil
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}
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// Has queries all known Indexes for the ID and returns the first match.
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func (mi *MasterIndex) Has(id restic.ID, tpe restic.BlobType) bool {
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mi.idxMutex.RLock()
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defer mi.idxMutex.RUnlock()
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for _, idx := range mi.idx {
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if idx.Has(id, tpe) {
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return true
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}
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}
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return false
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}
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// 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()
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defer mi.idxMutex.RUnlock()
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var sum uint
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for _, idx := range mi.idx {
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sum += idx.Count(t)
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}
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return sum
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}
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// Insert adds a new index to the MasterIndex.
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func (mi *MasterIndex) Insert(idx *Index) {
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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mi.idx = append(mi.idx, idx)
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}
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// Remove deletes an index from the MasterIndex.
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func (mi *MasterIndex) Remove(index *Index) {
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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for i, idx := range mi.idx {
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if idx == index {
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mi.idx = append(mi.idx[:i], mi.idx[i+1:]...)
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return
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}
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}
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}
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// Store remembers the id and pack in the index.
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func (mi *MasterIndex) Store(pb restic.PackedBlob) {
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mi.idxMutex.RLock()
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for _, idx := range mi.idx {
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if !idx.Final() {
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mi.idxMutex.RUnlock()
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idx.Store(pb)
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return
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}
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}
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mi.idxMutex.RUnlock()
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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newIdx := NewIndex()
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newIdx.Store(pb)
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mi.idx = append(mi.idx, newIdx)
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}
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// NotFinalIndexes returns all indexes that have not yet been saved.
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func (mi *MasterIndex) NotFinalIndexes() []*Index {
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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var list []*Index
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for _, idx := range mi.idx {
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if !idx.Final() {
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list = append(list, idx)
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}
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}
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debug.Log("return %d indexes", len(list))
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return list
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}
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// FullIndexes returns all indexes that are full.
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func (mi *MasterIndex) FullIndexes() []*Index {
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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var list []*Index
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debug.Log("checking %d indexes", len(mi.idx))
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for _, idx := range mi.idx {
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if idx.Final() {
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debug.Log("index %p is final", idx)
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continue
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}
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if IndexFull(idx) {
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debug.Log("index %p is full", idx)
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list = append(list, idx)
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} else {
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debug.Log("index %p not full", idx)
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}
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}
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debug.Log("return %d indexes", len(list))
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return list
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}
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// All returns all indexes.
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func (mi *MasterIndex) All() []*Index {
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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return mi.idx
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}
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// Each returns a channel that yields all blobs known to the index. When the
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// context is cancelled, the background goroutine terminates. This blocks any
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// modification of the index.
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func (mi *MasterIndex) Each(ctx context.Context) <-chan restic.PackedBlob {
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mi.idxMutex.RLock()
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ch := make(chan restic.PackedBlob)
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go func() {
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defer mi.idxMutex.RUnlock()
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defer func() {
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close(ch)
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}()
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for _, idx := range mi.idx {
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idxCh := idx.Each(ctx)
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for pb := range idxCh {
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select {
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case <-ctx.Done():
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return
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case ch <- pb:
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}
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}
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}
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}()
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return ch
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}
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// RebuildIndex combines all known indexes to a new index, leaving out any
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// packs whose ID is contained in packBlacklist. The new index contains the IDs
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// 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()
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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())
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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) {
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continue
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}
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newIndex.Store(pb)
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}
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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
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}
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id, err := idx.ID()
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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
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}
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debug.Log("adding index id %v to supersedes field", id.Str())
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err = newIndex.AddToSupersedes(id)
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if err != nil {
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return nil, err
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}
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}
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return newIndex, nil
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}
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