kcp

package
v2.1.1+incompatible Latest Latest
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 Go to latest Published: Sep 19, 2016 License: MIT Imports: 17 Imported by: 0

Documentation

Overview

Package kcp - A Fast and Reliable ARQ Protocol

Acknowledgement: 

skywind3000@github for inventing the KCP protocol
xtaci@github for translating to Golang

Index

Constants

View Source 
const (
	NumDistro  = 5
	DistroSize = 1600
)
View Source 
const (
	DataSegmentOverhead = 18
)

Variables

View Source 
var (
	ErrIOTimeout        = errors.New("Read/Write timeout")
	ErrClosedListener   = errors.New("Listener closed.")
	ErrClosedConnection = errors.New("Connection closed.")
)

Functions

func AllocateBuffer 

func AllocateBuffer() *alloc.Buffer

func DialKCP 

func DialKCP(src v2net.Address, dest v2net.Destination) (internet.Connection, error)

func ListenKCP 

func ListenKCP(address v2net.Address, port v2net.Port) (internet.Listener, error)

func NewSimpleAuthenticator 

func NewSimpleAuthenticator() internet.Authenticator

Types

type AckList 

type AckList struct {
	// contains filtered or unexported fields
}

func NewAckList 

func NewAckList(writer SegmentWriter) *AckList

func (*AckList) Add 

func (this *AckList) Add(number uint32, timestamp uint32)

func (*AckList) Clear 

func (this *AckList) Clear(una uint32)

func (*AckList) Flush 

func (this *AckList) Flush(current uint32, rto uint32)

type AckSegment 

type AckSegment struct {
	Conv            uint16
	Option          SegmentOption
	ReceivingWindow uint32
	ReceivingNext   uint32
	Timestamp       uint32
	Count           byte
	NumberList      []uint32
}

func NewAckSegment 

func NewAckSegment() *AckSegment

func (*AckSegment) ByteSize 

func (this *AckSegment) ByteSize() int

func (*AckSegment) Bytes 

func (this *AckSegment) Bytes(b []byte) []byte

func (*AckSegment) IsFull 

func (this *AckSegment) IsFull() bool

func (*AckSegment) PutNumber 

func (this *AckSegment) PutNumber(number uint32)

func (*AckSegment) PutTimestamp 

func (this *AckSegment) PutTimestamp(timestamp uint32)

func (*AckSegment) Release 

func (this *AckSegment) Release()

type AuthenticationWriter 

type AuthenticationWriter struct {
	Authenticator internet.Authenticator
	Writer        io.Writer
}

func (*AuthenticationWriter) Mtu 

func (this *AuthenticationWriter) Mtu() uint32

func (*AuthenticationWriter) Release 

func (this *AuthenticationWriter) Release()

func (*AuthenticationWriter) Write 

func (this *AuthenticationWriter) Write(payload *alloc.Buffer) error

type Buffer 

type Buffer struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewBuffer 

func NewBuffer() *Buffer

func (*Buffer) Allocate 

func (this *Buffer) Allocate() *alloc.Buffer

func (*Buffer) Free 

func (this *Buffer) Free(b *alloc.Buffer)

func (*Buffer) IsEmpty 

func (this *Buffer) IsEmpty() bool

func (*Buffer) Release 

func (this *Buffer) Release()

func (*Buffer) ReleaseBuffer 

func (this *Buffer) ReleaseBuffer()

type BufferedSegmentWriter 

type BufferedSegmentWriter struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewSegmentWriter 

func NewSegmentWriter(writer *AuthenticationWriter) *BufferedSegmentWriter

func (*BufferedSegmentWriter) Flush 

func (this *BufferedSegmentWriter) Flush()

func (*BufferedSegmentWriter) FlushWithoutLock 

func (this *BufferedSegmentWriter) FlushWithoutLock()

func (*BufferedSegmentWriter) Write 

func (this *BufferedSegmentWriter) Write(seg Segment)

type CmdOnlySegment 

type CmdOnlySegment struct {
	Conv         uint16
	Command      Command
	Option       SegmentOption
	SendingNext  uint32
	ReceivinNext uint32
	PeerRTO      uint32
}

func NewCmdOnlySegment 

func NewCmdOnlySegment() *CmdOnlySegment

func (*CmdOnlySegment) ByteSize 

func (this *CmdOnlySegment) ByteSize() int

func (*CmdOnlySegment) Bytes 

func (this *CmdOnlySegment) Bytes(b []byte) []byte

func (*CmdOnlySegment) Release 

func (this *CmdOnlySegment) Release()

type Command 

type Command byte
const (
	CommandACK       Command = 0
	CommandData      Command = 1
	CommandTerminate Command = 2
	CommandPing      Command = 3
)

type Config 

type Config struct {
	Mtu              uint32 // Maximum transmission unit
	Tti              uint32
	UplinkCapacity   uint32
	DownlinkCapacity uint32
	Congestion       bool
	WriteBuffer      uint32
	ReadBuffer       uint32
	HeaderType       string
	HeaderConfig     internet.AuthenticatorConfig
}

func DefaultConfig 

func DefaultConfig() Config

func (*Config) Apply 

func (this *Config) Apply()

func (*Config) GetAuthenticator 

func (this *Config) GetAuthenticator() (internet.Authenticator, error)

func (*Config) GetReceivingBufferSize 

func (this *Config) GetReceivingBufferSize() uint32

func (*Config) GetReceivingInFlightSize 

func (this *Config) GetReceivingInFlightSize() uint32

func (*Config) GetSendingBufferSize 

func (this *Config) GetSendingBufferSize() uint32

func (*Config) GetSendingInFlightSize 

func (this *Config) GetSendingInFlightSize() uint32

type Connection 

type Connection struct {
	// contains filtered or unexported fields
}

Connection is a KCP connection over UDP.

func NewConnection 

func NewConnection(conv uint16, writerCloser io.WriteCloser, local *net.UDPAddr, remote *net.UDPAddr, block internet.Authenticator) *Connection

NewConnection create a new KCP connection between local and remote.

func (*Connection) Close 

func (this *Connection) Close() error

Close closes the connection.

func (*Connection) Elapsed 

func (this *Connection) Elapsed() uint32

func (*Connection) FetchInputFrom 

func (this *Connection) FetchInputFrom(conn io.Reader)

func (*Connection) HandleOption 

func (this *Connection) HandleOption(opt SegmentOption)

func (*Connection) Input 

func (this *Connection) Input(data []byte) int

Input when you received a low level packet (eg. UDP packet), call it

func (*Connection) LocalAddr 

func (this *Connection) LocalAddr() net.Addr

LocalAddr returns the local network address. The Addr returned is shared by all invocations of LocalAddr, so do not modify it.

func (*Connection) OnPeerClosed 

func (this *Connection) OnPeerClosed()

func (*Connection) Read 

func (this *Connection) Read(b []byte) (int, error)

Read implements the Conn Read method.

func (*Connection) RemoteAddr 

func (this *Connection) RemoteAddr() net.Addr

RemoteAddr returns the remote network address. The Addr returned is shared by all invocations of RemoteAddr, so do not modify it.

func (*Connection) Reusable 

func (this *Connection) Reusable() bool

func (*Connection) SetDeadline 

func (this *Connection) SetDeadline(t time.Time) error

SetDeadline sets the deadline associated with the listener. A zero time value disables the deadline.

func (*Connection) SetReadDeadline 

func (this *Connection) SetReadDeadline(t time.Time) error

SetReadDeadline implements the Conn SetReadDeadline method.

func (*Connection) SetReusable 

func (this *Connection) SetReusable(b bool)

func (*Connection) SetState 

func (this *Connection) SetState(state State)

func (*Connection) SetWriteDeadline 

func (this *Connection) SetWriteDeadline(t time.Time) error

SetWriteDeadline implements the Conn SetWriteDeadline method.

func (*Connection) State 

func (this *Connection) State() State

func (*Connection) Terminate 

func (this *Connection) Terminate()

func (*Connection) Write 

func (this *Connection) Write(b []byte) (int, error)

Write implements the Conn Write method.

type DataSegment 

type DataSegment struct {
	Conv        uint16
	Option      SegmentOption
	Timestamp   uint32
	Number      uint32
	SendingNext uint32
	Data        *alloc.Buffer
	// contains filtered or unexported fields
}

func NewDataSegment 

func NewDataSegment() *DataSegment

func (*DataSegment) ByteSize 

func (this *DataSegment) ByteSize() int

func (*DataSegment) Bytes 

func (this *DataSegment) Bytes(b []byte) []byte

func (*DataSegment) Release 

func (this *DataSegment) Release()

type Listener 

type Listener struct {
	sync.Mutex
	// contains filtered or unexported fields
}

Listener defines a server listening for connections

func NewListener 

func NewListener(address v2net.Address, port v2net.Port) (*Listener, error)

func (*Listener) Accept 

func (this *Listener) Accept() (internet.Connection, error)

Accept implements the Accept method in the Listener interface; it waits for the next call and returns a generic Conn.

func (*Listener) ActiveConnections 

func (this *Listener) ActiveConnections() int

func (*Listener) Addr 

func (this *Listener) Addr() net.Addr

Addr returns the listener's network address, The Addr returned is shared by all invocations of Addr, so do not modify it.

func (*Listener) Close 

func (this *Listener) Close() error

Close stops listening on the UDP address. Already Accepted connections are not closed.

func (*Listener) OnReceive 

func (this *Listener) OnReceive(payload *alloc.Buffer, session *proxy.SessionInfo)

func (*Listener) Remove 

func (this *Listener) Remove(dest string)

type ReceivingWindow 

type ReceivingWindow struct {
	// contains filtered or unexported fields
}

func NewReceivingWindow 

func NewReceivingWindow(size uint32) *ReceivingWindow

func (*ReceivingWindow) Advance 

func (this *ReceivingWindow) Advance()

func (*ReceivingWindow) Position 

func (this *ReceivingWindow) Position(idx uint32) uint32

func (*ReceivingWindow) Remove 

func (this *ReceivingWindow) Remove(idx uint32) *DataSegment

func (*ReceivingWindow) RemoveFirst 

func (this *ReceivingWindow) RemoveFirst() *DataSegment

func (*ReceivingWindow) Set 

func (this *ReceivingWindow) Set(idx uint32, value *DataSegment) bool

func (*ReceivingWindow) Size 

func (this *ReceivingWindow) Size() uint32

type ReceivingWorker 

type ReceivingWorker struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewReceivingWorker 

func NewReceivingWorker(kcp *Connection) *ReceivingWorker

func (*ReceivingWorker) CloseRead 

func (this *ReceivingWorker) CloseRead()

func (*ReceivingWorker) Flush 

func (this *ReceivingWorker) Flush(current uint32)

func (*ReceivingWorker) ProcessSegment 

func (this *ReceivingWorker) ProcessSegment(seg *DataSegment)

func (*ReceivingWorker) ProcessSendingNext 

func (this *ReceivingWorker) ProcessSendingNext(number uint32)

func (*ReceivingWorker) Read 

func (this *ReceivingWorker) Read(b []byte) int

func (*ReceivingWorker) Write 

func (this *ReceivingWorker) Write(seg Segment)

type RoundTripInfo 

type RoundTripInfo struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func (*RoundTripInfo) SmoothedTime 

func (this *RoundTripInfo) SmoothedTime() uint32

func (*RoundTripInfo) Timeout 

func (this *RoundTripInfo) Timeout() uint32

func (*RoundTripInfo) Update 

func (this *RoundTripInfo) Update(rtt uint32, current uint32)

func (*RoundTripInfo) UpdatePeerRTO 

func (this *RoundTripInfo) UpdatePeerRTO(rto uint32, current uint32)

type Segment 

type Segment interface {
	common.Releasable
	ByteSize() int
	Bytes([]byte) []byte
}

func ReadSegment 

func ReadSegment(buf []byte) (Segment, []byte)

type SegmentOption 

type SegmentOption byte
const (
	SegmentOptionClose SegmentOption = 1
)

type SegmentWriter 

type SegmentWriter interface {
	Write(seg Segment)
}

type SendingWindow 

type SendingWindow struct {
	// contains filtered or unexported fields
}

func NewSendingWindow 

func NewSendingWindow(size uint32, writer SegmentWriter, onPacketLoss func(uint32)) *SendingWindow

func (*SendingWindow) Clear 

func (this *SendingWindow) Clear(una uint32)

func (*SendingWindow) First 

func (this *SendingWindow) First() *DataSegment

func (*SendingWindow) Flush 

func (this *SendingWindow) Flush(current uint32, resend uint32, rto uint32, maxInFlightSize uint32)

func (*SendingWindow) HandleFastAck 

func (this *SendingWindow) HandleFastAck(number uint32)

func (*SendingWindow) IsEmpty 

func (this *SendingWindow) IsEmpty() bool

func (*SendingWindow) IsFull 

func (this *SendingWindow) IsFull() bool

func (*SendingWindow) Len 

func (this *SendingWindow) Len() int

func (*SendingWindow) Push 

func (this *SendingWindow) Push(seg *DataSegment)

func (*SendingWindow) Remove 

func (this *SendingWindow) Remove(idx uint32)

func (*SendingWindow) Size 

func (this *SendingWindow) Size() uint32

type SendingWorker 

type SendingWorker struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewSendingWorker 

func NewSendingWorker(kcp *Connection) *SendingWorker

func (*SendingWorker) CloseWrite 

func (this *SendingWorker) CloseWrite()

func (*SendingWorker) FindFirstUnacknowledged 

func (this *SendingWorker) FindFirstUnacknowledged()

Private: Visible for testing.

func (*SendingWorker) Flush 

func (this *SendingWorker) Flush(current uint32)

func (*SendingWorker) IsEmpty 

func (this *SendingWorker) IsEmpty() bool

func (*SendingWorker) OnPacketLoss 

func (this *SendingWorker) OnPacketLoss(lossRate uint32)

func (*SendingWorker) ProcessAck 

func (this *SendingWorker) ProcessAck(number uint32)

Private: Visible for testing.

func (*SendingWorker) ProcessReceivingNext 

func (this *SendingWorker) ProcessReceivingNext(nextNumber uint32)

func (*SendingWorker) ProcessReceivingNextWithoutLock 

func (this *SendingWorker) ProcessReceivingNextWithoutLock(nextNumber uint32)

func (*SendingWorker) ProcessSegment 

func (this *SendingWorker) ProcessSegment(current uint32, seg *AckSegment)

func (*SendingWorker) Push 

func (this *SendingWorker) Push(b []byte) int

func (*SendingWorker) Write 

func (this *SendingWorker) Write(seg Segment)

Private: Visible for testing.

type SimpleAuthenticator 

type SimpleAuthenticator struct{}

func (*SimpleAuthenticator) Open 

func (this *SimpleAuthenticator) Open(buffer *alloc.Buffer) bool

func (*SimpleAuthenticator) Overhead 

func (this *SimpleAuthenticator) Overhead() int

func (*SimpleAuthenticator) Seal 

func (this *SimpleAuthenticator) Seal(buffer *alloc.Buffer)

type State 

type State int32
const (
	StateActive          State = 0
	StateReadyToClose    State = 1
	StatePeerClosed      State = 2
	StateTerminating     State = 3
	StatePeerTerminating State = 4
	StateTerminated      State = 5
)

func (State) Is 

func (this State) Is(states ...State) bool

type Writer 

type Writer struct {
	// contains filtered or unexported fields
}

func (*Writer) Close 

func (this *Writer) Close() error

func (*Writer) Write 

func (this *Writer) Write(payload []byte) (int, error)

Source Files

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