135 lines
3.4 KiB
Go
135 lines
3.4 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package db
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import (
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"bytes"
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"fmt"
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"github.com/syncthing/syncthing/lib/protocol"
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)
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const (
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KeyTypeDevice = iota
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KeyTypeGlobal
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KeyTypeBlock
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KeyTypeDeviceStatistic
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KeyTypeFolderStatistic
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KeyTypeVirtualMtime
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KeyTypeFolderIdx
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KeyTypeDeviceIdx
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KeyTypeIndexID
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KeyTypeFolderMeta
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KeyTypeMiscData
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KeyTypeSequence
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KeyTypeNeed
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)
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func (vl VersionList) String() string {
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var b bytes.Buffer
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var id protocol.DeviceID
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b.WriteString("{")
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for i, v := range vl.Versions {
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if i > 0 {
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b.WriteString(", ")
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}
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copy(id[:], v.Device)
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fmt.Fprintf(&b, "{%v, %v}", v.Version, id)
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}
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b.WriteString("}")
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return b.String()
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}
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// update brings the VersionList up to date with file. It returns the updated
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// VersionList, a potentially removed old FileVersion and its index, as well as
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// the index where the new FileVersion was inserted.
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func (vl VersionList) update(folder, device []byte, file protocol.FileInfo, db *Instance) (_ VersionList, removedFV FileVersion, removedAt int, insertedAt int) {
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removedAt, insertedAt = -1, -1
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for i, v := range vl.Versions {
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if bytes.Equal(v.Device, device) {
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removedAt = i
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removedFV = v
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vl.Versions = append(vl.Versions[:i], vl.Versions[i+1:]...)
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break
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}
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}
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nv := FileVersion{
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Device: device,
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Version: file.Version,
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Invalid: file.Invalid,
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}
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for i, v := range vl.Versions {
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switch v.Version.Compare(file.Version) {
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case protocol.Equal:
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if nv.Invalid {
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continue
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}
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fallthrough
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case protocol.Lesser:
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// The version at this point in the list is equal to or lesser
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// ("older") than us. We insert ourselves in front of it.
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vl = vl.insertAt(i, nv)
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return vl, removedFV, removedAt, i
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case protocol.ConcurrentLesser, protocol.ConcurrentGreater:
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// The version at this point is in conflict with us. We must pull
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// the actual file metadata to determine who wins. If we win, we
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// insert ourselves in front of the loser here. (The "Lesser" and
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// "Greater" in the condition above is just based on the device
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// IDs in the version vector, which is not the only thing we use
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// to determine the winner.)
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//
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// A surprise missing file entry here is counted as a win for us.
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if of, ok := db.getFile(db.deviceKey(folder, v.Device, []byte(file.Name))); !ok || file.WinsConflict(of) {
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vl = vl.insertAt(i, nv)
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return vl, removedFV, removedAt, i
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}
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}
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}
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// We didn't find a position for an insert above, so append to the end.
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vl.Versions = append(vl.Versions, nv)
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return vl, removedFV, removedAt, len(vl.Versions) - 1
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}
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func (vl VersionList) insertAt(i int, v FileVersion) VersionList {
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vl.Versions = append(vl.Versions, FileVersion{})
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copy(vl.Versions[i+1:], vl.Versions[i:])
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vl.Versions[i] = v
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return vl
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}
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func (vl VersionList) Get(device []byte) (FileVersion, bool) {
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for _, v := range vl.Versions {
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if bytes.Equal(v.Device, device) {
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return v, true
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}
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}
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return FileVersion{}, false
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}
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type fileList []protocol.FileInfo
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func (fl fileList) Len() int {
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return len(fl)
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}
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func (fl fileList) Swap(a, b int) {
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fl[a], fl[b] = fl[b], fl[a]
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}
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func (fl fileList) Less(a, b int) bool {
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return fl[a].Name < fl[b].Name
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}
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// Flush batches to disk when they contain this many records.
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const batchFlushSize = 64
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