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gc.go
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gc.go
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package gc
import (
bstore "github.com/ipfs/go-ipfs/blocks/blockstore"
key "github.com/ipfs/go-ipfs/blocks/key"
bserv "github.com/ipfs/go-ipfs/blockservice"
offline "github.com/ipfs/go-ipfs/exchange/offline"
dag "github.com/ipfs/go-ipfs/merkledag"
pin "github.com/ipfs/go-ipfs/pin"
logging "gx/ipfs/QmNQynaz7qfriSUJkiEZUrm2Wen1u3Kj9goZzWtrPyu7XR/go-log"
context "gx/ipfs/QmZy2y8t9zQH2a1b8q2ZSLKp17ATuJoCNxxyMFG5qFExpt/go-net/context"
)
var log = logging.Logger("gc")
// GC performs a mark and sweep garbage collection of the blocks in the blockstore
// first, it creates a 'marked' set and adds to it the following:
// - all recursively pinned blocks, plus all of their descendants (recursively)
// - bestEffortRoots, plus all of its descendants (recursively)
// - all directly pinned blocks
// - all blocks utilized internally by the pinner
//
// The routine then iterates over every block in the blockstore and
// deletes any block that is not found in the marked set.
func GC(ctx context.Context, bs bstore.GCBlockstore, pn pin.Pinner, bestEffortRoots []key.Key) (<-chan key.Key, error) {
unlocker := bs.GCLock()
bsrv := bserv.New(bs, offline.Exchange(bs))
ds := dag.NewDAGService(bsrv)
gcs, err := ColoredSet(ctx, pn, ds, bestEffortRoots)
if err != nil {
return nil, err
}
keychan, err := bs.AllKeysChan(ctx)
if err != nil {
return nil, err
}
output := make(chan key.Key)
go func() {
defer close(output)
defer unlocker.Unlock()
for {
select {
case k, ok := <-keychan:
if !ok {
return
}
if !gcs.Has(k) {
err := bs.DeleteBlock(k)
if err != nil {
log.Debugf("Error removing key from blockstore: %s", err)
return
}
select {
case output <- k:
case <-ctx.Done():
return
}
}
case <-ctx.Done():
return
}
}
}()
return output, nil
}
func Descendants(ctx context.Context, ds dag.DAGService, set key.KeySet, roots []key.Key, bestEffort bool) error {
for _, k := range roots {
set.Add(k)
nd, err := ds.Get(ctx, k)
if err != nil {
return err
}
// EnumerateChildren recursively walks the dag and adds the keys to the given set
err = dag.EnumerateChildren(ctx, ds, nd, set, bestEffort)
if err != nil {
return err
}
}
return nil
}
func ColoredSet(ctx context.Context, pn pin.Pinner, ds dag.DAGService, bestEffortRoots []key.Key) (key.KeySet, error) {
// KeySet currently implemented in memory, in the future, may be bloom filter or
// disk backed to conserve memory.
gcs := key.NewKeySet()
err := Descendants(ctx, ds, gcs, pn.RecursiveKeys(), false)
if err != nil {
return nil, err
}
err = Descendants(ctx, ds, gcs, bestEffortRoots, true)
if err != nil {
return nil, err
}
for _, k := range pn.DirectKeys() {
gcs.Add(k)
}
err = Descendants(ctx, ds, gcs, pn.InternalPins(), false)
if err != nil {
return nil, err
}
return gcs, nil
}