// ldbRemoveFromGlobal removes the node from the global version list for the
// given file. If the version list is empty after this, the file entry is
// removed entirely.
func ldbRemoveFromGlobal(db dbReader, batch dbWriter, repo, node, file []byte) {
if debug {
l.Debugf("remove from global; repo=%q node=%v file=%q", repo, protocol.NodeIDFromBytes(node), file)
}
gk := globalKey(repo, file)
svl, err := db.Get(gk, nil)
if err != nil {
panic(err)
}
var fl versionList
err = fl.UnmarshalXDR(svl)
if err != nil {
panic(err)
}
for i := range fl.versions {
if bytes.Compare(fl.versions[i].node, node) == 0 {
fl.versions = append(fl.versions[:i], fl.versions[i+1:]...)
break
}
}
if len(fl.versions) == 0 {
batch.Delete(gk)
} else {
batch.Put(gk, fl.MarshalXDR())
}
}
func ldbAvailability(db *leveldb.DB, repo, file []byte) []protocol.NodeID {
k := globalKey(repo, file)
bs, err := db.Get(k, nil)
if err == leveldb.ErrNotFound {
return nil
}
if err != nil {
panic(err)
}
var vl versionList
err = vl.UnmarshalXDR(bs)
if err != nil {
panic(err)
}
var nodes []protocol.NodeID
for _, v := range vl.versions {
if v.version != vl.versions[0].version {
break
}
n := protocol.NodeIDFromBytes(v.node)
nodes = append(nodes, n)
}
return nodes
}
func ldbReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
// TODO: Return the remaining maxLocalVer?
return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) uint64 {
// Disk has files that we are missing. Remove it.
if debug {
l.Debugf("delete; repo=%q node=%v name=%q", repo, protocol.NodeIDFromBytes(node), name)
}
ldbRemoveFromGlobal(db, batch, repo, node, name)
batch.Delete(dbi.Key())
return 0
})
}
// ldbUpdateGlobal adds this node+version to the version list for the given
// file. If the node is already present in the list, the version is updated.
// If the file does not have an entry in the global list, it is created.
func ldbUpdateGlobal(db dbReader, batch dbWriter, repo, node, file []byte, version uint64) bool {
if debug {
l.Debugf("update global; repo=%q node=%v file=%q version=%d", repo, protocol.NodeIDFromBytes(node), file, version)
}
gk := globalKey(repo, file)
svl, err := db.Get(gk, nil)
if err != nil && err != leveldb.ErrNotFound {
panic(err)
}
var fl versionList
nv := fileVersion{
node: node,
version: version,
}
if svl != nil {
err = fl.UnmarshalXDR(svl)
if err != nil {
panic(err)
}
for i := range fl.versions {
if bytes.Compare(fl.versions[i].node, node) == 0 {
if fl.versions[i].version == version {
// No need to do anything
return false
}
fl.versions = append(fl.versions[:i], fl.versions[i+1:]...)
break
}
}
}
for i := range fl.versions {
if fl.versions[i].version <= version {
t := append(fl.versions, fileVersion{})
copy(t[i+1:], t[i:])
t[i] = nv
fl.versions = t
goto done
}
}
fl.versions = append(fl.versions, nv)
done:
batch.Put(gk, fl.MarshalXDR())
return true
}
func ldbInsert(batch dbWriter, repo, node, name []byte, file protocol.FileInfo) uint64 {
if debug {
l.Debugf("insert; repo=%q node=%v %v", repo, protocol.NodeIDFromBytes(node), file)
}
if file.LocalVersion == 0 {
file.LocalVersion = clock(0)
}
nk := nodeKey(repo, node, name)
batch.Put(nk, file.MarshalXDR())
return file.LocalVersion
}
func ldbReplaceWithDelete(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) uint64 {
var f protocol.FileInfo
err := f.UnmarshalXDR(dbi.Value())
if err != nil {
panic(err)
}
if !protocol.IsDeleted(f.Flags) {
if debug {
l.Debugf("mark deleted; repo=%q node=%v name=%q", repo, protocol.NodeIDFromBytes(node), name)
}
ts := clock(f.LocalVersion)
f.Blocks = nil
f.Version = lamport.Default.Tick(f.Version)
f.Flags |= protocol.FlagDeleted
f.LocalVersion = ts
batch.Put(dbi.Key(), f.MarshalXDR())
ldbUpdateGlobal(db, batch, repo, node, nodeKeyName(dbi.Key()), f.Version)
return ts
}
return 0
})
}
func ldbWithNeed(db *leveldb.DB, repo, node []byte, fn fileIterator) {
start := globalKey(repo, nil)
limit := globalKey(repo, []byte{0xff, 0xff, 0xff, 0xff})
snap, err := db.GetSnapshot()
if err != nil {
panic(err)
}
defer snap.Release()
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
defer dbi.Release()
for dbi.Next() {
var vl versionList
err := vl.UnmarshalXDR(dbi.Value())
if err != nil {
panic(err)
}
if len(vl.versions) == 0 {
l.Debugln(dbi.Key())
panic("no versions?")
}
have := false // If we have the file, any version
need := false // If we have a lower version of the file
var haveVersion uint64
for _, v := range vl.versions {
if bytes.Compare(v.node, node) == 0 {
have = true
haveVersion = v.version
need = v.version < vl.versions[0].version
break
}
}
if need || !have {
name := globalKeyName(dbi.Key())
if debug {
l.Debugf("need repo=%q node=%v name=%q need=%v have=%v haveV=%d globalV=%d", repo, protocol.NodeIDFromBytes(node), name, need, have, haveVersion, vl.versions[0].version)
}
fk := nodeKey(repo, vl.versions[0].node, name)
bs, err := snap.Get(fk, nil)
if err != nil {
panic(err)
}
var gf protocol.FileInfo
err = gf.UnmarshalXDR(bs)
if err != nil {
panic(err)
}
if protocol.IsDeleted(gf.Flags) && !have {
// We don't need deleted files that we don't have
continue
}
if cont := fn(gf); !cont {
return
}
}
}
}
func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo, deleteFn deletionHandler) uint64 {
sort.Sort(fileList(fs)) // sort list on name, same as on disk
start := nodeKey(repo, node, nil) // before all repo/node files
limit := nodeKey(repo, node, []byte{0xff, 0xff, 0xff, 0xff}) // after all repo/node files
batch := new(leveldb.Batch)
snap, err := db.GetSnapshot()
if err != nil {
panic(err)
}
defer snap.Release()
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
defer dbi.Release()
moreDb := dbi.Next()
fsi := 0
var maxLocalVer uint64
for {
var newName, oldName []byte
moreFs := fsi < len(fs)
if !moreDb && !moreFs {
break
}
if !moreFs && deleteFn == nil {
// We don't have any more updated files to process and deletion
// has not been requested, so we can exit early
break
}
if moreFs {
newName = []byte(fs[fsi].Name)
}
if moreDb {
oldName = nodeKeyName(dbi.Key())
}
cmp := bytes.Compare(newName, oldName)
if debug {
l.Debugf("generic replace; repo=%q node=%v moreFs=%v moreDb=%v cmp=%d newName=%q oldName=%q", repo, protocol.NodeIDFromBytes(node), moreFs, moreDb, cmp, newName, oldName)
}
switch {
case moreFs && (!moreDb || cmp == -1):
// Disk is missing this file. Insert it.
if lv := ldbInsert(batch, repo, node, newName, fs[fsi]); lv > maxLocalVer {
maxLocalVer = lv
}
ldbUpdateGlobal(snap, batch, repo, node, newName, fs[fsi].Version)
fsi++
case moreFs && moreDb && cmp == 0:
// File exists on both sides - compare versions.
var ef protocol.FileInfo
ef.UnmarshalXDR(dbi.Value())
if fs[fsi].Version > ef.Version {
if lv := ldbInsert(batch, repo, node, newName, fs[fsi]); lv > maxLocalVer {
maxLocalVer = lv
}
ldbUpdateGlobal(snap, batch, repo, node, newName, fs[fsi].Version)
}
// Iterate both sides.
fsi++
moreDb = dbi.Next()
case moreDb && (!moreFs || cmp == 1):
if deleteFn != nil {
if lv := deleteFn(snap, batch, repo, node, oldName, dbi); lv > maxLocalVer {
maxLocalVer = lv
}
}
moreDb = dbi.Next()
}
}
err = db.Write(batch, nil)
if err != nil {
panic(err)
}
return maxLocalVer
}