kcp

package module
v1.0.1 Latest Latest
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 Go to latest Published: Nov 14, 2022 License: MIT Imports: 19 Imported by: 2

README

在kcp 基础上，兼容dtls

Documentation

Overview

Package kcp-go is a Reliable-UDP library for golang.

This library intents to provide a smooth, resilient, ordered, error-checked and anonymous delivery of streams over UDP packets.

The interfaces of this package aims to be compatible with net.Conn in standard library, but offers powerful features for advanced users.

Index

Constants

View Source 
const (
	IKCP_RTO_NDL     = 30  // no delay min rto
	IKCP_RTO_MIN     = 100 // normal min rto
	IKCP_RTO_DEF     = 200
	IKCP_RTO_MAX     = 60000
	IKCP_CMD_PUSH    = 81 // cmd: push data
	IKCP_CMD_ACK     = 82 // cmd: ack
	IKCP_CMD_WASK    = 83 // cmd: window probe (ask)
	IKCP_CMD_WINS    = 84 // cmd: window size (tell)
	IKCP_ASK_SEND    = 1  // need to send IKCP_CMD_WASK
	IKCP_ASK_TELL    = 2  // need to send IKCP_CMD_WINS
	IKCP_WND_SND     = 32
	IKCP_WND_RCV     = 32
	IKCP_MTU_DEF     = 1350
	IKCP_ACK_FAST    = 3
	IKCP_INTERVAL    = 100
	IKCP_OVERHEAD    = 24
	IKCP_DEADLINK    = 20
	IKCP_THRESH_INIT = 2
	IKCP_THRESH_MIN  = 2
	IKCP_PROBE_INIT  = 7000   // 7 secs to probe window size
	IKCP_PROBE_LIMIT = 120000 // up to 120 secs to probe window
	IKCP_SN_OFFSET   = 12
)

Variables

This section is empty.

Functions

This section is empty.

Types

type Entropy 

type Entropy interface {
	Init()
	Fill(nonce []byte)
}

Entropy defines a entropy source

type KCP 

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

KCP defines a single KCP connection

func NewKCP 

func NewKCP(conv uint32, output output_callback) *KCP

NewKCP create a new kcp state machine

'conv' must be equal in the connection peers, or else data will be silently rejected.

'output' function will be called whenever these is data to be sent on wire.

func (*KCP) Check 

func (kcp *KCP) Check() uint32

(deprecated)

Check determines when should you invoke ikcp_update: returns when you should invoke ikcp_update in millisec, if there is no ikcp_input/_send calling. you can call ikcp_update in that time, instead of call update repeatly. Important to reduce unnacessary ikcp_update invoking. use it to schedule ikcp_update (eg. implementing an epoll-like mechanism, or optimize ikcp_update when handling massive kcp connections)

func (*KCP) Input 

func (kcp *KCP) Input(data []byte, regular, ackNoDelay bool) int

Input a packet into kcp state machine.

'regular' indicates it's a real data packet from remote, and it means it's not generated from ReedSolomon codecs.

'ackNoDelay' will trigger immediate ACK, but surely it will not be efficient in bandwidth

func (*KCP) NoDelay 

func (kcp *KCP) NoDelay(nodelay, interval, resend, nc int) int

NoDelay options fastest: ikcp_nodelay(kcp, 1, 20, 2, 1) nodelay: 0:disable(default), 1:enable interval: internal update timer interval in millisec, default is 100ms resend: 0:disable fast resend(default), 1:enable fast resend nc: 0:normal congestion control(default), 1:disable congestion control

func (*KCP) PeekSize 

func (kcp *KCP) PeekSize() (length int)

PeekSize checks the size of next message in the recv queue

func (*KCP) Recv 

func (kcp *KCP) Recv(buffer []byte) (n int)

Receive data from kcp state machine

Return number of bytes read.

Return -1 when there is no readable data.

Return -2 if len(buffer) is smaller than kcp.PeekSize().

func (*KCP) ReleaseTX 

func (kcp *KCP) ReleaseTX()

Release all cached outgoing segments

func (*KCP) ReserveBytes 

func (kcp *KCP) ReserveBytes(n int) bool

ReserveBytes keeps n bytes untouched from the beginning of the buffer, the output_callback function should be aware of this.

Return false if n >= mss

func (*KCP) Send 

func (kcp *KCP) Send(buffer []byte) int

Send is user/upper level send, returns below zero for error

func (*KCP) SetMtu 

func (kcp *KCP) SetMtu(mtu int) int

SetMtu changes MTU size, default is 1400

func (*KCP) Update 

func (kcp *KCP) Update()

(deprecated)

Update updates state (call it repeatedly, every 10ms-100ms), or you can ask ikcp_check when to call it again (without ikcp_input/_send calling). 'current' - current timestamp in millisec.

func (*KCP) WaitSnd 

func (kcp *KCP) WaitSnd() int

WaitSnd gets how many packet is waiting to be sent

func (*KCP) WndSize 

func (kcp *KCP) WndSize(sndwnd, rcvwnd int) int

WndSize sets maximum window size: sndwnd=32, rcvwnd=32 by default

type KCPListener added in v1.0.1 

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

func Listen added in v1.0.1 

func Listen(laddr *net.UDPAddr, config *dtls.Config) (*KCPListener, error)

func (*KCPListener) Accept added in v1.0.1 

func (kl *KCPListener) Accept() (*UDPSession, error)

func (*KCPListener) Addr added in v1.0.1 

func (kl *KCPListener) Addr() net.Addr

func (*KCPListener) Close added in v1.0.1 

func (kl *KCPListener) Close() error

type Snmp 

type Snmp struct {
	BytesSent        uint64 // bytes sent from upper level
	BytesReceived    uint64 // bytes received to upper level
	MaxConn          uint64 // max number of connections ever reached
	ActiveOpens      uint64 // accumulated active open connections
	PassiveOpens     uint64 // accumulated passive open connections
	CurrEstab        uint64 // current number of established connections
	InErrs           uint64 // UDP read errors reported from net.PacketConn
	InCsumErrors     uint64 // checksum errors from CRC32
	KCPInErrors      uint64 // packet iput errors reported from KCP
	InPkts           uint64 // incoming packets count
	OutPkts          uint64 // outgoing packets count
	InSegs           uint64 // incoming KCP segments
	OutSegs          uint64 // outgoing KCP segments
	InBytes          uint64 // UDP bytes received
	OutBytes         uint64 // UDP bytes sent
	RetransSegs      uint64 // accmulated retransmited segments
	FastRetransSegs  uint64 // accmulated fast retransmitted segments
	EarlyRetransSegs uint64 // accmulated early retransmitted segments
	LostSegs         uint64 // number of segs inferred as lost
	RepeatSegs       uint64 // number of segs duplicated
	FECRecovered     uint64 // correct packets recovered from FEC
	FECErrs          uint64 // incorrect packets recovered from FEC
	FECParityShards  uint64 // FEC segments received
	FECShortShards   uint64 // number of data shards that's not enough for recovery
}

Snmp defines network statistics indicator 

var DefaultSnmp *Snmp

DefaultSnmp is the global KCP connection statistics collector

func (*Snmp) Copy 

func (s *Snmp) Copy() *Snmp

Copy make a copy of current snmp snapshot

func (*Snmp) Header 

func (s *Snmp) Header() []string

Header returns all field names

func (*Snmp) Reset 

func (s *Snmp) Reset()

Reset values to zero

func (*Snmp) ToSlice 

func (s *Snmp) ToSlice() []string

ToSlice returns current snmp info as slice

type TimedSched 

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

TimedSched represents the control struct for timed parallel scheduler 

var SystemTimedSched *TimedSched = NewTimedSched(runtime.NumCPU())

SystemTimedSched is the library level timed-scheduler

func NewTimedSched 

func NewTimedSched(parallel int) *TimedSched

NewTimedSched creates a parallel-scheduler with given parallelization

func (*TimedSched) Close 

func (ts *TimedSched) Close()

Close terminates this scheduler

func (*TimedSched) Put 

func (ts *TimedSched) Put(f func(), deadline time.Time)

Put a function 'f' awaiting to be executed at 'deadline'

type UDPSession 

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

UDPSession defines a KCP session implemented by UDP

func DialWithContext added in v1.0.1 

func DialWithContext(ctx context.Context, raddr *net.UDPAddr, config *dtls.Config) (*UDPSession, error)

func NewConn 

func NewConn(convid uint32, raddr net.Addr, dataShards, parityShards int, conn net.Conn) (*UDPSession, error)

NewConn establishes a session and talks KCP protocol over a packet connection.

func (*UDPSession) Close 

func (s *UDPSession) Close() error

Close closes the connection.

func (*UDPSession) GetConv 

func (s *UDPSession) GetConv() uint32

GetConv gets conversation id of a session

func (*UDPSession) GetRTO 

func (s *UDPSession) GetRTO() uint32

GetRTO gets current rto of the session

func (*UDPSession) GetSRTT 

func (s *UDPSession) GetSRTT() int32

GetSRTT gets current srtt of the session

func (*UDPSession) GetSRTTVar 

func (s *UDPSession) GetSRTTVar() int32

GetRTTVar gets current rtt variance of the session

func (*UDPSession) LocalAddr 

func (s *UDPSession) 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 (*UDPSession) Read 

func (s *UDPSession) Read(b []byte) (n int, err error)

Read implements net.Conn

func (*UDPSession) RemoteAddr 

func (s *UDPSession) 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 (*UDPSession) SetACKNoDelay 

func (s *UDPSession) SetACKNoDelay(nodelay bool)

SetACKNoDelay changes ack flush option, set true to flush ack immediately,

func (*UDPSession) SetDSCP 

func (s *UDPSession) SetDSCP(dscp int) error

SetDSCP sets the 6bit DSCP field in IPv4 header, or 8bit Traffic Class in IPv6 header.

if the underlying connection has implemented `func SetDSCP(int) error`, SetDSCP() will invoke this function instead.

It has no effect if it's accepted from Listener.

func (*UDPSession) SetDUP 

func (s *UDPSession) SetDUP(dup int)

(deprecated)

SetDUP duplicates udp packets for kcp output.

func (*UDPSession) SetDeadline 

func (s *UDPSession) SetDeadline(t time.Time) error

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

func (*UDPSession) SetMtu 

func (s *UDPSession) SetMtu(mtu int) bool

SetMtu sets the maximum transmission unit(not including UDP header)

func (*UDPSession) SetNoDelay 

func (s *UDPSession) SetNoDelay(nodelay, interval, resend, nc int)

SetNoDelay calls nodelay() of kcp https://github.com/skywind3000/kcp/blob/master/README.en.md#protocol-configuration

func (*UDPSession) SetReadBuffer 

func (s *UDPSession) SetReadBuffer(bytes int) error

SetReadBuffer sets the socket read buffer, no effect if it's accepted from Listener

func (*UDPSession) SetReadDeadline 

func (s *UDPSession) SetReadDeadline(t time.Time) error

SetReadDeadline implements the Conn SetReadDeadline method.

func (*UDPSession) SetStreamMode 

func (s *UDPSession) SetStreamMode(enable bool)

SetStreamMode toggles the stream mode on/off

func (*UDPSession) SetWindowSize 

func (s *UDPSession) SetWindowSize(sndwnd, rcvwnd int)

SetWindowSize set maximum window size

func (*UDPSession) SetWriteBuffer 

func (s *UDPSession) SetWriteBuffer(bytes int) error

SetWriteBuffer sets the socket write buffer, no effect if it's accepted from Listener

func (*UDPSession) SetWriteDeadline 

func (s *UDPSession) SetWriteDeadline(t time.Time) error

SetWriteDeadline implements the Conn SetWriteDeadline method.

func (*UDPSession) SetWriteDelay 

func (s *UDPSession) SetWriteDelay(delay bool)

SetWriteDelay delays write for bulk transfer until the next update interval

func (*UDPSession) Write 

func (s *UDPSession) Write(b []byte) (n int, err error)

Write implements net.Conn

func (*UDPSession) WriteBuffers 

func (s *UDPSession) WriteBuffers(v [][]byte) (n int, err error)

WriteBuffers write a vector of byte slices to the underlying connection

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