source: code/trunk/vendor/nhooyr.io/websocket/close.go@ 822

package websocket

import (
        "errors"
        "fmt"
)

// StatusCode represents a WebSocket status code.
// https://tools.ietf.org/html/rfc6455#section-7.4
type StatusCode int

// https://www.iana.org/assignments/websocket/websocket.xhtml#close-code-number
//
// These are only the status codes defined by the protocol.
//
// You can define custom codes in the 3000-4999 range.
// The 3000-3999 range is reserved for use by libraries, frameworks and applications.
// The 4000-4999 range is reserved for private use.
const (
        StatusNormalClosure   StatusCode = 1000
        StatusGoingAway       StatusCode = 1001
        StatusProtocolError   StatusCode = 1002
        StatusUnsupportedData StatusCode = 1003

        // 1004 is reserved and so unexported.
        statusReserved StatusCode = 1004

        // StatusNoStatusRcvd cannot be sent in a close message.
        // It is reserved for when a close message is received without
        // a status code.
        StatusNoStatusRcvd StatusCode = 1005

        // StatusAbnormalClosure is exported for use only with Wasm.
        // In non Wasm Go, the returned error will indicate whether the
        // connection was closed abnormally.
        StatusAbnormalClosure StatusCode = 1006

        StatusInvalidFramePayloadData StatusCode = 1007
        StatusPolicyViolation         StatusCode = 1008
        StatusMessageTooBig           StatusCode = 1009
        StatusMandatoryExtension      StatusCode = 1010
        StatusInternalError           StatusCode = 1011
        StatusServiceRestart          StatusCode = 1012
        StatusTryAgainLater           StatusCode = 1013
        StatusBadGateway              StatusCode = 1014

        // StatusTLSHandshake is only exported for use with Wasm.
        // In non Wasm Go, the returned error will indicate whether there was
        // a TLS handshake failure.
        StatusTLSHandshake StatusCode = 1015
)

// CloseError is returned when the connection is closed with a status and reason.
//
// Use Go 1.13's errors.As to check for this error.
// Also see the CloseStatus helper.
type CloseError struct {
        Code   StatusCode
        Reason string
}

func (ce CloseError) Error() string {
        return fmt.Sprintf("status = %v and reason = %q", ce.Code, ce.Reason)
}

// CloseStatus is a convenience wrapper around Go 1.13's errors.As to grab
// the status code from a CloseError.
//
// -1 will be returned if the passed error is nil or not a CloseError.
func CloseStatus(err error) StatusCode {
        var ce CloseError
        if errors.As(err, &ce) {
                return ce.Code
        }
        return -1
}