syncthing/lib/protocol/message.go

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// Copyright (C) 2014 The Protocol Authors.
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//go:generate -command genxdr go run ../../vendor/github.com/calmh/xdr/cmd/genxdr/main.go
//go:generate genxdr -o message_xdr.go message.go
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package protocol
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import (
"bytes"
"crypto/sha256"
"fmt"
)
var (
sha256OfEmptyBlock = sha256.Sum256(make([]byte, BlockSize))
HelloMessageMagic uint32 = 0x9F79BC40
)
type HelloMessage struct {
DeviceName string // max:64
ClientName string // max:64
ClientVersion string // max:64
}
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type IndexMessage struct {
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Folder string // max:256
Files []FileInfo // max:1000000
Flags uint32
Options []Option // max:64
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}
type FileInfo struct {
Name string // max:8192
Flags uint32
Modified int64
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Version Vector
LocalVersion int64
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CachedSize int64 // noencode (cache only)
Blocks []BlockInfo // max:10000000
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}
func (f FileInfo) String() string {
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return fmt.Sprintf("File{Name:%q, Flags:0%o, Modified:%d, Version:%v, Size:%d, Blocks:%v}",
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f.Name, f.Flags, f.Modified, f.Version, f.Size(), f.Blocks)
}
func (f FileInfo) Size() (bytes int64) {
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if f.IsDeleted() || f.IsDirectory() {
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return 128
}
Don't load block list in ...Truncated methods Speeds up and reduces allocations on those operations, at the price of having a manually tweaked XDR decoder for FileInfoTruncated. benchmark old ns/op new ns/op delta BenchmarkReplaceAll-8 1868198122 1880206886 +0.64% BenchmarkUpdateOneChanged-8 231852 172695 -25.51% BenchmarkUpdateOneUnchanged-8 230624 179341 -22.24% BenchmarkNeedHalf-8 104601744 109461427 +4.65% BenchmarkHave-8 29102480 34105026 +17.19% BenchmarkGlobal-8 150547687 172778045 +14.77% BenchmarkNeedHalfTruncated-8 102471355 76564986 -25.28% BenchmarkHaveTruncated-8 28758368 14277481 -50.35% BenchmarkGlobalTruncated-8 151192913 106070136 -29.84% benchmark old allocs new allocs delta BenchmarkReplaceAll-8 555577 557554 +0.36% BenchmarkUpdateOneChanged-8 1135 587 -48.28% BenchmarkUpdateOneUnchanged-8 1135 587 -48.28% BenchmarkNeedHalf-8 374780 374775 -0.00% BenchmarkHave-8 151992 152085 +0.06% BenchmarkGlobal-8 530033 530135 +0.02% BenchmarkNeedHalfTruncated-8 374699 22160 -94.09% BenchmarkHaveTruncated-8 151834 4904 -96.77% BenchmarkGlobalTruncated-8 530037 30536 -94.24% benchmark old bytes new bytes delta BenchmarkReplaceAll-8 1765116216 1765305376 +0.01% BenchmarkUpdateOneChanged-8 135085 93043 -31.12% BenchmarkUpdateOneUnchanged-8 134976 92928 -31.15% BenchmarkNeedHalf-8 44758752 44751791 -0.02% BenchmarkHave-8 11845052 11967172 +1.03% BenchmarkGlobal-8 80431136 80431065 -0.00% BenchmarkNeedHalfTruncated-8 46526459 18243543 -60.79% BenchmarkHaveTruncated-8 11348357 418998 -96.31% BenchmarkGlobalTruncated-8 80977672 43116991 -46.75%
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if f.CachedSize > 0 {
return f.CachedSize
}
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for _, b := range f.Blocks {
bytes += int64(b.Size)
}
Don't load block list in ...Truncated methods Speeds up and reduces allocations on those operations, at the price of having a manually tweaked XDR decoder for FileInfoTruncated. benchmark old ns/op new ns/op delta BenchmarkReplaceAll-8 1868198122 1880206886 +0.64% BenchmarkUpdateOneChanged-8 231852 172695 -25.51% BenchmarkUpdateOneUnchanged-8 230624 179341 -22.24% BenchmarkNeedHalf-8 104601744 109461427 +4.65% BenchmarkHave-8 29102480 34105026 +17.19% BenchmarkGlobal-8 150547687 172778045 +14.77% BenchmarkNeedHalfTruncated-8 102471355 76564986 -25.28% BenchmarkHaveTruncated-8 28758368 14277481 -50.35% BenchmarkGlobalTruncated-8 151192913 106070136 -29.84% benchmark old allocs new allocs delta BenchmarkReplaceAll-8 555577 557554 +0.36% BenchmarkUpdateOneChanged-8 1135 587 -48.28% BenchmarkUpdateOneUnchanged-8 1135 587 -48.28% BenchmarkNeedHalf-8 374780 374775 -0.00% BenchmarkHave-8 151992 152085 +0.06% BenchmarkGlobal-8 530033 530135 +0.02% BenchmarkNeedHalfTruncated-8 374699 22160 -94.09% BenchmarkHaveTruncated-8 151834 4904 -96.77% BenchmarkGlobalTruncated-8 530037 30536 -94.24% benchmark old bytes new bytes delta BenchmarkReplaceAll-8 1765116216 1765305376 +0.01% BenchmarkUpdateOneChanged-8 135085 93043 -31.12% BenchmarkUpdateOneUnchanged-8 134976 92928 -31.15% BenchmarkNeedHalf-8 44758752 44751791 -0.02% BenchmarkHave-8 11845052 11967172 +1.03% BenchmarkGlobal-8 80431136 80431065 -0.00% BenchmarkNeedHalfTruncated-8 46526459 18243543 -60.79% BenchmarkHaveTruncated-8 11348357 418998 -96.31% BenchmarkGlobalTruncated-8 80977672 43116991 -46.75%
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f.CachedSize = bytes
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return
}
func (f FileInfo) IsDeleted() bool {
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return f.Flags&FlagDeleted != 0
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}
func (f FileInfo) IsInvalid() bool {
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return f.Flags&FlagInvalid != 0
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}
func (f FileInfo) IsDirectory() bool {
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return f.Flags&FlagDirectory != 0
}
func (f FileInfo) IsSymlink() bool {
return f.Flags&FlagSymlink != 0
}
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func (f FileInfo) HasPermissionBits() bool {
return f.Flags&FlagNoPermBits == 0
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}
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// WinsConflict returns true if "f" is the one to choose when it is in
// conflict with "other".
func (f FileInfo) WinsConflict(other FileInfo) bool {
// If a modification is in conflict with a delete, we pick the
// modification.
if !f.IsDeleted() && other.IsDeleted() {
return true
}
if f.IsDeleted() && !other.IsDeleted() {
return false
}
// The one with the newer modification time wins.
if f.Modified > other.Modified {
return true
}
if f.Modified < other.Modified {
return false
}
// The modification times were equal. Use the device ID in the version
// vector as tie breaker.
return f.Version.Compare(other.Version) == ConcurrentGreater
}
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type BlockInfo struct {
Offset int64 // noencode (cache only)
Size int32
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Hash []byte // max:64
}
func (b BlockInfo) String() string {
return fmt.Sprintf("Block{%d/%d/%x}", b.Offset, b.Size, b.Hash)
}
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// IsEmpty returns true if the block is a full block of zeroes.
func (b BlockInfo) IsEmpty() bool {
return b.Size == BlockSize && bytes.Equal(b.Hash, sha256OfEmptyBlock[:])
}
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type RequestMessage struct {
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Folder string // max:256
Name string // max:8192
Offset int64
Size int32
Hash []byte // max:64
Flags uint32
Options []Option // max:64
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}
type ResponseMessage struct {
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Data []byte
Code int32
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}
type ClusterConfigMessage struct {
Folders []Folder // max:1000000
Options []Option // max:64
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}
type DownloadProgressMessage struct {
Folder string // max:64
Updates []FileDownloadProgressUpdate // max:1000000
Flags uint32
Options []Option // max:64
}
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func (o *ClusterConfigMessage) GetOption(key string) string {
for _, option := range o.Options {
if option.Key == key {
return option.Value
}
}
return ""
}
type Folder struct {
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ID string // max:256
Label string // max:256
Devices []Device // max:1000000
Flags uint32
Options []Option // max:64
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}
type Device struct {
ID []byte // max:32
Name string // max:64
Addresses []string // max:64,2083
Compression uint32
CertName string // max:64
MaxLocalVersion int64
Flags uint32
Options []Option // max:64
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}
type FileDownloadProgressUpdate struct {
UpdateType uint32
Name string // max:8192
Version Vector
BlockIndexes []int32 // max:1000000
}
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type Option struct {
Key string // max:64
Value string // max:1024
}
type CloseMessage struct {
Reason string // max:1024
Code int32
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}
type EmptyMessage struct{}