lnd.xprv/lnwire/error.go
2020-12-04 23:07:53 +08:00

140 lines
3.9 KiB
Go

package lnwire
import (
"fmt"
"io"
)
// FundingError represents a set of errors that can be encountered and sent
// during the funding workflow.
type FundingError uint8
const (
// ErrMaxPendingChannels is returned by remote peer when the number of
// active pending channels exceeds their maximum policy limit.
ErrMaxPendingChannels FundingError = 1
// ErrSynchronizingChain is returned by a remote peer that receives a
// channel update or a funding request while it's still syncing to the
// latest state of the blockchain.
ErrSynchronizingChain FundingError = 2
// ErrChanTooLarge is returned by a remote peer that receives a
// FundingOpen request for a channel that is above their current
// soft-limit.
ErrChanTooLarge FundingError = 3
)
// String returns a human readable version of the target FundingError.
func (e FundingError) String() string {
switch e {
case ErrMaxPendingChannels:
return "Number of pending channels exceed maximum"
case ErrSynchronizingChain:
return "Synchronizing blockchain"
case ErrChanTooLarge:
return "channel too large"
default:
return "unknown error"
}
}
// Error returns the human readable version of the target FundingError.
//
// NOTE: Satisfies the Error interface.
func (e FundingError) Error() string {
return e.String()
}
// ErrorData is a set of bytes associated with a particular sent error. A
// receiving node SHOULD only print out data verbatim if the string is composed
// solely of printable ASCII characters. For reference, the printable character
// set includes byte values 32 through 127 inclusive.
type ErrorData []byte
// Error represents a generic error bound to an exact channel. The message
// format is purposefully general in order to allow expression of a wide array
// of possible errors. Each Error message is directed at a particular open
// channel referenced by ChannelPoint.
type Error struct {
// ChanID references the active channel in which the error occurred
// within. If the ChanID is all zeros, then this error applies to the
// entire established connection.
ChanID ChannelID
// Data is the attached error data that describes the exact failure
// which caused the error message to be sent.
Data ErrorData
}
// NewError creates a new Error message.
func NewError() *Error {
return &Error{}
}
// A compile time check to ensure Error implements the lnwire.Message
// interface.
var _ Message = (*Error)(nil)
// Error returns the string representation to Error.
//
// NOTE: Satisfies the error interface.
func (c *Error) Error() string {
errMsg := "non-ascii data"
if isASCII(c.Data) {
errMsg = string(c.Data)
}
return fmt.Sprintf("chan_id=%v, err=%v", c.ChanID, errMsg)
}
// Decode deserializes a serialized Error message stored in the passed
// io.Reader observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *Error) Decode(r io.Reader, pver uint32) error {
return ReadElements(r,
&c.ChanID,
&c.Data,
)
}
// Encode serializes the target Error into the passed io.Writer observing the
// protocol version specified.
//
// This is part of the lnwire.Message interface.
func (c *Error) Encode(w io.Writer, pver uint32) error {
return WriteElements(w,
c.ChanID,
c.Data,
)
}
// MsgType returns the integer uniquely identifying an Error message on the
// wire.
//
// This is part of the lnwire.Message interface.
func (c *Error) MsgType() MessageType {
return MsgError
}
// MaxPayloadLength returns the maximum allowed payload size for an Error
// complete message observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *Error) MaxPayloadLength(uint32) uint32 {
// 32 + 2 + 65501
return 65535
}
// isASCII is a helper method that checks whether all bytes in `data` would be
// printable ASCII characters if interpreted as a string.
func isASCII(data []byte) bool {
for _, c := range data {
if c < 32 || c > 126 {
return false
}
}
return true
}