mirror of
https://github.com/restic/restic.git
synced 2024-08-24 21:27:23 +02:00
446 lines
11 KiB
Go
446 lines
11 KiB
Go
package index
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import (
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"bytes"
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"context"
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"fmt"
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"runtime"
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"sync"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/ui/progress"
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"golang.org/x/sync/errgroup"
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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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pendingBlobs restic.BlobSet
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idxMutex sync.RWMutex
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compress bool
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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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// Always add an empty final index, such that MergeFinalIndexes can merge into this.
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// Note that removing this index could lead to a race condition in the rare
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// sitation that only two indexes exist which are saved and merged concurrently.
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idx := []*Index{NewIndex()}
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idx[0].Finalize()
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return &MasterIndex{idx: idx, pendingBlobs: restic.NewBlobSet()}
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}
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func (mi *MasterIndex) MarkCompressed() {
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mi.compress = true
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}
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// Lookup queries all known Indexes for the ID and returns all matches.
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func (mi *MasterIndex) Lookup(bh restic.BlobHandle) (pbs []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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pbs = idx.Lookup(bh, pbs)
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}
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return pbs
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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(bh restic.BlobHandle) (uint, 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 size, found := idx.LookupSize(bh); found {
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return size, found
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}
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}
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return 0, false
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}
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// AddPending adds a given blob to list of pending Blobs
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// Before doing so it checks if this blob is already known.
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// Returns true if adding was successful and false if the blob
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// was already known
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func (mi *MasterIndex) AddPending(bh restic.BlobHandle) bool {
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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// Check if blob is pending or in index
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if mi.pendingBlobs.Has(bh) {
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return false
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}
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for _, idx := range mi.idx {
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if idx.Has(bh) {
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return false
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}
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}
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// really not known -> insert
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mi.pendingBlobs.Insert(bh)
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return true
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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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// Also returns true if the ID is pending.
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func (mi *MasterIndex) Has(bh restic.BlobHandle) bool {
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mi.idxMutex.RLock()
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defer mi.idxMutex.RUnlock()
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// also return true if blob is pending
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if mi.pendingBlobs.Has(bh) {
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return true
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}
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for _, idx := range mi.idx {
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if idx.Has(bh) {
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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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// IDs returns the IDs of all indexes contained in the index.
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func (mi *MasterIndex) IDs() restic.IDSet {
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mi.idxMutex.RLock()
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defer mi.idxMutex.RUnlock()
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ids := restic.NewIDSet()
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for _, idx := range mi.idx {
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if !idx.Final() {
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continue
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}
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indexIDs, err := idx.IDs()
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if err != nil {
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debug.Log("not using index, ID() returned error %v", err)
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continue
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}
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for _, id := range indexIDs {
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ids.Insert(id)
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}
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}
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return ids
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}
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// Packs returns all packs that are covered by the index.
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// If packBlacklist is given, those packs are only contained in the
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// resulting IDSet if they are contained in a non-final (newly written) index.
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func (mi *MasterIndex) Packs(packBlacklist restic.IDSet) restic.IDSet {
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mi.idxMutex.RLock()
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defer mi.idxMutex.RUnlock()
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packs := restic.NewIDSet()
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for _, idx := range mi.idx {
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idxPacks := idx.Packs()
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if idx.final && len(packBlacklist) > 0 {
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idxPacks = idxPacks.Sub(packBlacklist)
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}
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packs.Merge(idxPacks)
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}
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return packs
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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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// StorePack remembers the id and pack in the index.
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func (mi *MasterIndex) StorePack(id restic.ID, blobs []restic.Blob) {
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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// delete blobs from pending
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for _, blob := range blobs {
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mi.pendingBlobs.Delete(restic.BlobHandle{Type: blob.Type, ID: blob.ID})
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}
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for _, idx := range mi.idx {
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if !idx.Final() {
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idx.StorePack(id, blobs)
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return
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}
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}
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newIdx := NewIndex()
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newIdx.StorePack(id, blobs)
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mi.idx = append(mi.idx, newIdx)
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}
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// finalizeNotFinalIndexes finalizes all indexes that
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// have not yet been saved and returns that list
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func (mi *MasterIndex) finalizeNotFinalIndexes() []*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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idx.Finalize()
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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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// finalizeFullIndexes finalizes all indexes that are full and returns that list.
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func (mi *MasterIndex) finalizeFullIndexes() []*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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continue
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}
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if IndexFull(idx, mi.compress) {
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debug.Log("index %p is full", idx)
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idx.Finalize()
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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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// Each runs fn on all blobs known to the index. When the context is cancelled,
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// the index iteration return immediately. This blocks any modification of the index.
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func (mi *MasterIndex) Each(ctx context.Context, fn func(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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idx.Each(ctx, fn)
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}
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}
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// MergeFinalIndexes merges all final indexes together.
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// After calling, there will be only one big final index in MasterIndex
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// containing all final index contents.
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// Indexes that are not final are left untouched.
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// This merging can only be called after all index files are loaded - as
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// removing of superseded index contents is only possible for unmerged indexes.
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func (mi *MasterIndex) MergeFinalIndexes() error {
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mi.idxMutex.Lock()
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defer mi.idxMutex.Unlock()
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// The first index is always final and the one to merge into
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newIdx := mi.idx[:1]
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for i := 1; i < len(mi.idx); i++ {
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idx := mi.idx[i]
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// clear reference in masterindex as it may become stale
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mi.idx[i] = nil
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// do not merge indexes that have no id set
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ids, _ := idx.IDs()
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if !idx.Final() || len(ids) == 0 {
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newIdx = append(newIdx, idx)
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} else {
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err := mi.idx[0].merge(idx)
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if err != nil {
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return fmt.Errorf("MergeFinalIndexes: %w", err)
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}
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}
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}
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mi.idx = newIdx
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return nil
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}
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// Save saves all known indexes to index files, leaving out any
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// packs whose ID is contained in packBlacklist from finalized indexes.
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// The new index contains the IDs of all known indexes in the "supersedes"
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// field. The IDs are also returned in the IDSet obsolete.
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// After calling this function, you should remove the obsolete index files.
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func (mi *MasterIndex) Save(ctx context.Context, repo restic.SaverUnpacked, packBlacklist restic.IDSet, extraObsolete restic.IDs, p *progress.Counter) (obsolete restic.IDSet, err error) {
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p.SetMax(uint64(len(mi.Packs(packBlacklist))))
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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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obsolete = restic.NewIDSet()
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// track spawned goroutines using wg, create a new context which is
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// cancelled as soon as an error occurs.
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wg, ctx := errgroup.WithContext(ctx)
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ch := make(chan *Index)
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wg.Go(func() error {
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defer close(ch)
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for i, idx := range mi.idx {
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if idx.Final() {
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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 err
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}
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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 {
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return err
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}
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obsolete.Merge(restic.NewIDSet(ids...))
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} else {
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debug.Log("index %d isn't final, don't add to supersedes field", i)
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}
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debug.Log("adding index %d", i)
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for pbs := range idx.EachByPack(ctx, packBlacklist) {
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newIndex.StorePack(pbs.PackID, pbs.Blobs)
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p.Add(1)
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if IndexFull(newIndex, mi.compress) {
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select {
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case ch <- newIndex:
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case <-ctx.Done():
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return ctx.Err()
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}
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newIndex = NewIndex()
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}
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}
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}
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err = newIndex.AddToSupersedes(extraObsolete...)
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if err != nil {
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return err
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}
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obsolete.Merge(restic.NewIDSet(extraObsolete...))
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select {
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case ch <- newIndex:
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case <-ctx.Done():
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}
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return nil
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})
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// a worker receives an index from ch, and saves the index
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worker := func() error {
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for idx := range ch {
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idx.Finalize()
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if _, err := SaveIndex(ctx, repo, idx); err != nil {
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return err
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}
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}
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return nil
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}
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// encoding an index can take quite some time such that this can be both CPU- or IO-bound
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workerCount := int(repo.Connections()) + runtime.GOMAXPROCS(0)
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// run workers on ch
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for i := 0; i < workerCount; i++ {
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wg.Go(worker)
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}
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err = wg.Wait()
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return obsolete, err
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}
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// SaveIndex saves an index in the repository.
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func SaveIndex(ctx context.Context, repo restic.SaverUnpacked, index *Index) (restic.ID, error) {
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buf := bytes.NewBuffer(nil)
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err := index.Encode(buf)
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if err != nil {
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return restic.ID{}, err
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}
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id, err := repo.SaveUnpacked(ctx, restic.IndexFile, buf.Bytes())
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ierr := index.SetID(id)
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if ierr != nil {
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// logic bug
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panic(ierr)
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}
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return id, err
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}
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// saveIndex saves all indexes in the backend.
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func (mi *MasterIndex) saveIndex(ctx context.Context, r restic.SaverUnpacked, indexes ...*Index) error {
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for i, idx := range indexes {
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debug.Log("Saving index %d", i)
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sid, err := SaveIndex(ctx, r, idx)
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if err != nil {
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return err
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}
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debug.Log("Saved index %d as %v", i, sid)
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}
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return mi.MergeFinalIndexes()
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}
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// SaveIndex saves all new indexes in the backend.
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func (mi *MasterIndex) SaveIndex(ctx context.Context, r restic.SaverUnpacked) error {
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return mi.saveIndex(ctx, r, mi.finalizeNotFinalIndexes()...)
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}
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// SaveFullIndex saves all full indexes in the backend.
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func (mi *MasterIndex) SaveFullIndex(ctx context.Context, r restic.SaverUnpacked) error {
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return mi.saveIndex(ctx, r, mi.finalizeFullIndexes()...)
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}
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// ListPacks returns the blobs of the specified pack files grouped by pack file.
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func (mi *MasterIndex) ListPacks(ctx context.Context, packs restic.IDSet) <-chan restic.PackBlobs {
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out := make(chan restic.PackBlobs)
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go func() {
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defer close(out)
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// only resort a part of the index to keep the memory overhead bounded
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for i := byte(0); i < 16; i++ {
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if ctx.Err() != nil {
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return
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}
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packBlob := make(map[restic.ID][]restic.Blob)
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for pack := range packs {
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if pack[0]&0xf == i {
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packBlob[pack] = nil
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}
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}
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if len(packBlob) == 0 {
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continue
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}
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mi.Each(ctx, func(pb restic.PackedBlob) {
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if packs.Has(pb.PackID) && pb.PackID[0]&0xf == i {
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packBlob[pb.PackID] = append(packBlob[pb.PackID], pb.Blob)
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}
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})
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// pass on packs
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for packID, pbs := range packBlob {
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// allow GC
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packBlob[packID] = nil
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select {
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case out <- restic.PackBlobs{PackID: packID, Blobs: pbs}:
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case <-ctx.Done():
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return
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}
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}
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}
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}()
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return out
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}
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