websocket

README

websocket

Documentation

Index

• Constants
• Variables
• func FormatCloseMessage(closeCode int, text string) []byte
• func IsCloseError(err error, codes ...int) bool
• func IsUnexpectedCloseError(err error, expectedCodes ...int) bool
• func OnClose()
• func RegisterCloseHooks(h ...func())
• func ResetCloseHooks()
• type BufferPool
• type CloseError
  • func (e *CloseError) Error() string
• type Conn
  • func Upgrade(req *Request, c znet.Conn) (conn *Conn, err error)
  • func (c *Conn) Close() error
  • func (c *Conn) CloseHandler() func(code int, text string) error
  • func (c *Conn) EnableWriteCompression(enable bool)
  • func (c *Conn) LocalAddr() net.Addr
  • func (c *Conn) NetConn() net.Conn
  • func (c *Conn) NextReader() (messageType int, r io.Reader, err error)
  • func (c *Conn) NextWriter(messageType int) (io.WriteCloser, error)
  • func (c *Conn) PingHandler() func(appData string) error
  • func (c *Conn) PongHandler() func(appData string) error
  • func (c *Conn) ReadMessage() (messageType int, p []byte, err error)
  • func (c *Conn) RemoteAddr() net.Addr
  • func (c *Conn) SetCloseHandler(h func(code int, text string) error)
  • func (c *Conn) SetCompressionLevel(level int) error
  • func (c *Conn) SetPingHandler(h func(appData string) error)
  • func (c *Conn) SetPongHandler(h func(appData string) error)
  • func (c *Conn) SetReadDeadline(t time.Time) error
  • func (c *Conn) SetReadLimit(limit int64)
  • func (c *Conn) SetWriteDeadline(t time.Time) error
  • func (c *Conn) Subprotocol() string
  • func (c *Conn) UnderlyingConn() net.Conn
  • func (c *Conn) WriteControl(messageType int, data []byte, deadline time.Time) error
  • func (c *Conn) WriteMessage(messageType int, data []byte) error
  • func (c *Conn) WritePreparedMessage(pm *PreparedMessage) error
• type Hooks
• type PreparedMessage
  • func NewPreparedMessage(messageType int, data []byte) (*PreparedMessage, error)
• type Reader
• type Request
  • func ReadRequest(r Reader) (req *Request, err error)

Constants

const (
	CloseNormalClosure           = 1000
	CloseGoingAway               = 1001
	CloseProtocolError           = 1002
	CloseUnsupportedData         = 1003
	CloseNoStatusReceived        = 1005
	CloseAbnormalClosure         = 1006
	CloseInvalidFramePayloadData = 1007
	ClosePolicyViolation         = 1008
	CloseMessageTooBig           = 1009
	CloseMandatoryExtension      = 1010
	CloseInternalServerErr       = 1011
	CloseServiceRestart          = 1012
	CloseTryAgainLater           = 1013
	CloseTLSHandshake            = 1015
)

Close codes defined in RFC 6455, section 11.7.

const (
	// TextMessage denotes a text data message. The text message payload is
	// interpreted as UTF-8 encoded text data.
	TextMessage = 1

	// BinaryMessage denotes a binary data message.
	BinaryMessage = 2

	// CloseMessage denotes a close control message. The optional message
	// payload contains a numeric code and text. Use the FormatCloseMessage
	// function to format a close message payload.
	CloseMessage = 8

	// PingMessage denotes a ping control message. The optional message payload
	// is UTF-8 encoded text.
	PingMessage = 9

	// PongMessage denotes a pong control message. The optional message payload
	// is UTF-8 encoded text.
	PongMessage = 10
)

The message types are defined in RFC 6455, section 11.8.

Variables

var (

	// ErrBadRequestMethod bad request method
	ErrBadRequestMethod = errors.New("bad method")
	// ErrNotWebSocket not websocket protocal
	ErrNotWebSocket = errors.New("not websocket protocol")
	// ErrBadWebSocketVersion bad websocket version
	ErrBadWebSocketVersion = errors.New("missing or bad WebSocket Version")
	// ErrChallengeResponse mismatch challenge response
	ErrChallengeResponse = errors.New("mismatch challenge/response")
)

var ErrCloseSent = errors.New("websocket: close sent")

ErrCloseSent is returned when the application writes a message to the connection after sending a close message.

var ErrReadLimit = errors.New("websocket: read limit exceeded")

ErrReadLimit is returned when reading a message that is larger than the read limit set for the connection.

Functions

func FormatCloseMessage

func FormatCloseMessage(closeCode int, text string) []byte

FormatCloseMessage formats closeCode and text as a WebSocket close message. An empty message is returned for code CloseNoStatusReceived.

func IsCloseError

func IsCloseError(err error, codes ...int) bool

IsCloseError returns boolean indicating whether the error is a *CloseError with one of the specified codes.

func IsUnexpectedCloseError

func IsUnexpectedCloseError(err error, expectedCodes ...int) bool

IsUnexpectedCloseError returns boolean indicating whether the error is a *CloseError with a code not in the list of expected codes.

func OnClose

func OnClose()

func RegisterCloseHooks

func RegisterCloseHooks(h ...func())

func ResetCloseHooks

func ResetCloseHooks()

Types

type BufferPool

type BufferPool interface {
	// Get gets a value from the pool or returns nil if the pool is empty.
	Get() interface{}
	// Put adds a value to the pool.
	Put(interface{})
}

BufferPool represents a pool of buffers. The *sync.Pool type satisfies this interface. The type of the value stored in a pool is not specified.

type CloseError

type CloseError struct {
	// Code is defined in RFC 6455, section 11.7.
	Code int

	// Text is the optional text payload.
	Text string
}

CloseError represents a close message.

func (*CloseError) Error

func (e *CloseError) Error() string

type Conn

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

The Conn type represents a WebSocket connection.

func Upgrade

func Upgrade(req *Request, c znet.Conn) (conn *Conn, err error)

func (*Conn) Close

func (c *Conn) Close() error

Close closes the underlying network connection without sending or waiting for a close message.

func (*Conn) CloseHandler

func (c *Conn) CloseHandler() func(code int, text string) error

CloseHandler returns the current close handler

func (*Conn) EnableWriteCompression

func (c *Conn) EnableWriteCompression(enable bool)

EnableWriteCompression enables and disables write compression of subsequent text and binary messages. This function is a noop if compression was not negotiated with the peer.

func (*Conn) LocalAddr

func (c *Conn) LocalAddr() net.Addr

LocalAddr returns the local network address.

func (*Conn) NetConn

func (c *Conn) NetConn() net.Conn

NetConn returns the underlying connection that is wrapped by c. Note that writing to or reading from this connection directly will corrupt the WebSocket connection.

func (*Conn) NextReader

func (c *Conn) NextReader() (messageType int, r io.Reader, err error)

NextReader returns the next data message received from the peer. The returned messageType is either TextMessage or BinaryMessage.

There can be at most one open reader on a connection. NextReader discards the previous message if the application has not already consumed it.

Applications must break out of the application's read loop when this method returns a non-nil error value. Errors returned from this method are permanent. Once this method returns a non-nil error, all subsequent calls to this method return the same error.

func (*Conn) NextWriter

func (c *Conn) NextWriter(messageType int) (io.WriteCloser, error)

NextWriter returns a writer for the next message to send. The writer's Close method flushes the complete message to the network.

There can be at most one open writer on a connection. NextWriter closes the previous writer if the application has not already done so.

All message types (TextMessage, BinaryMessage, CloseMessage, PingMessage and PongMessage) are supported.

func (*Conn) PingHandler

func (c *Conn) PingHandler() func(appData string) error

PingHandler returns the current ping handler

func (*Conn) PongHandler

func (c *Conn) PongHandler() func(appData string) error

PongHandler returns the current pong handler

func (*Conn) ReadMessage

func (c *Conn) ReadMessage() (messageType int, p []byte, err error)

ReadMessage is a helper method for getting a reader using NextReader and reading from that reader to a buffer.

func (*Conn) RemoteAddr

func (c *Conn) RemoteAddr() net.Addr

RemoteAddr returns the remote network address.

func (*Conn) SetCloseHandler

func (c *Conn) SetCloseHandler(h func(code int, text string) error)

SetCloseHandler sets the handler for close messages received from the peer. The code argument to h is the received close code or CloseNoStatusReceived if the close message is empty. The default close handler sends a close message back to the peer.

The handler function is called from the NextReader, ReadMessage and message reader Read methods. The application must read the connection to process close messages as described in the section on Control Messages above.

The connection read methods return a CloseError when a close message is received. Most applications should handle close messages as part of their normal error handling. Applications should only set a close handler when the application must perform some action before sending a close message back to the peer.

func (*Conn) SetCompressionLevel

func (c *Conn) SetCompressionLevel(level int) error

SetCompressionLevel sets the flate compression level for subsequent text and binary messages. This function is a noop if compression was not negotiated with the peer. See the compress/flate package for a description of compression levels.

func (*Conn) SetPingHandler

func (c *Conn) SetPingHandler(h func(appData string) error)

SetPingHandler sets the handler for ping messages received from the peer. The appData argument to h is the PING message application data. The default ping handler sends a pong to the peer.

The handler function is called from the NextReader, ReadMessage and message reader Read methods. The application must read the connection to process ping messages as described in the section on Control Messages above.

func (*Conn) SetPongHandler

func (c *Conn) SetPongHandler(h func(appData string) error)

SetPongHandler sets the handler for pong messages received from the peer. The appData argument to h is the PONG message application data. The default pong handler does nothing.

The handler function is called from the NextReader, ReadMessage and message reader Read methods. The application must read the connection to process pong messages as described in the section on Control Messages above.

func (*Conn) SetReadDeadline

func (c *Conn) SetReadDeadline(t time.Time) error

SetReadDeadline sets the read deadline on the underlying network connection. After a read has timed out, the websocket connection state is corrupt and all future reads will return an error. A zero value for t means reads will not time out.

func (*Conn) SetReadLimit

func (c *Conn) SetReadLimit(limit int64)

SetReadLimit sets the maximum size in bytes for a message read from the peer. If a message exceeds the limit, the connection sends a close message to the peer and returns ErrReadLimit to the application.

func (*Conn) SetWriteDeadline

func (c *Conn) SetWriteDeadline(t time.Time) error

SetWriteDeadline sets the write deadline on the underlying network connection. After a write has timed out, the websocket state is corrupt and all future writes will return an error. A zero value for t means writes will not time out.

func (*Conn) Subprotocol

func (c *Conn) Subprotocol() string

Subprotocol returns the negotiated protocol for the connection.

func (*Conn) UnderlyingConn

func (c *Conn) UnderlyingConn() net.Conn

UnderlyingConn returns the internal net.Conn. This can be used to further modifications to connection specific flags. Deprecated: Use the NetConn method.

func (*Conn) WriteControl

func (c *Conn) WriteControl(messageType int, data []byte, deadline time.Time) error

WriteControl writes a control message with the given deadline. The allowed message types are CloseMessage, PingMessage and PongMessage.

func (*Conn) WriteMessage

func (c *Conn) WriteMessage(messageType int, data []byte) error

WriteMessage is a helper method for getting a writer using NextWriter, writing the message and closing the writer.

func (*Conn) WritePreparedMessage

func (c *Conn) WritePreparedMessage(pm *PreparedMessage) error

WritePreparedMessage writes prepared message into connection.

type Hooks

type Hooks []func()

type PreparedMessage

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

PreparedMessage caches on the wire representations of a message payload. Use PreparedMessage to efficiently send a message payload to multiple connections. PreparedMessage is especially useful when compression is used because the CPU and memory expensive compression operation can be executed once for a given set of compression options.

func NewPreparedMessage

func NewPreparedMessage(messageType int, data []byte) (*PreparedMessage, error)

NewPreparedMessage returns an initialized PreparedMessage. You can then send it to connection using WritePreparedMessage method. Valid wire representation will be calculated lazily only once for a set of current connection options.

type Reader

type Reader interface {
	ReadLine() ([]byte, bool, error)
}

type Request

type Request struct {
	Method     string
	RequestURI string
	Protocol   string
	Host       string
	Header     http.Header
	// contains filtered or unexported fields
}

func ReadRequest

func ReadRequest(r Reader) (req *Request, err error)