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 inFlight struct { backend.IDSet sync.RWMutex } } // NewMasterIndex creates a new master index. func NewMasterIndex() *MasterIndex { return &MasterIndex{ inFlight: struct { backend.IDSet sync.RWMutex }{ IDSet: backend.NewIDSet(), }, } } // 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 } // AddInFlight add the given ID to the list of in-flight IDs. An error is // returned when the ID is already in the list. func (mi *MasterIndex) AddInFlight(id backend.ID) error { mi.inFlight.Lock() defer mi.inFlight.Unlock() debug.Log("MasterIndex.AddInFlight", "adding %v", id) if mi.inFlight.Has(id) { return fmt.Errorf("%v is already in flight", id) } mi.inFlight.Insert(id) return nil } // IsInFlight returns true iff the id is contained in the list of in-flight IDs. func (mi *MasterIndex) IsInFlight(id backend.ID) bool { mi.inFlight.RLock() defer mi.inFlight.RUnlock() inFlight := mi.inFlight.Has(id) debug.Log("MasterIndex.IsInFlight", "testing whether %v is in flight: %v", id.Str(), inFlight) return inFlight } // RemoveFromInFlight deletes the given ID from the liste of in-flight IDs. func (mi *MasterIndex) RemoveFromInFlight(id backend.ID) { mi.inFlight.Lock() defer mi.inFlight.Unlock() debug.Log("MasterIndex.RemoveFromInFlight", "removing %v from list of in flight blobs", id.Str()) mi.inFlight.Delete(id) } // 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 }