lnd.xprv/lnwire/error_generic.go

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package lnwire
import (
"fmt"
"io"
"github.com/roasbeef/btcd/wire"
"google.golang.org/grpc/codes"
)
// ErrorCode represents the short error code for each of the defined errors
// within the Lightning Network protocol spec.
type ErrorCode uint16
// ToGrpcCode is used to generate gRPC specific code which will be propagated
// to the ln rpc client. This code is used to have more detailed view of what
// goes wrong and also in order to have the ability pragmatically determine
// the error and take specific actions on the client side.
func (e ErrorCode) ToGrpcCode() codes.Code {
return (codes.Code)(e) + 100
}
const (
// ErrMaxPendingChannels is returned by remote peer when the number of
// active pending channels exceeds their maximum policy limit.
ErrMaxPendingChannels ErrorCode = 1
// ErrSynchronizingChain is returned by a remote peer that receives a
// channel update or a funding request while their still syncing to the
// latest state of the blockchain.
ErrSynchronizingChain ErrorCode = 2
)
// ErrorGeneric represents a generic error bound to an exact channel. The
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// message format is purposefully general in order to allow expression of a wide
// array of possible errors. Each ErrorGeneric message is directed at a particular
// open channel referenced by ChannelPoint.
type ErrorGeneric struct {
// ChannelPoint references the active channel in which the error
// occurred within. A ChannelPoint of zeroHash:0 denotes this error
// applies to the entire established connection.
ChannelPoint *wire.OutPoint
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// PendingChannelID allows peers communicate errors in the context of a
// particular pending channel. With this field, once a peer reads an
// ErrorGeneric message with the PendingChannelID field set, then they
// can forward the error to the fundingManager who can handle it
// properly.
PendingChannelID uint64
// Code is the short error ID which describes the nature of the error.
Code ErrorCode
// Problem is a human-readable string further elaborating upon the
// nature of the exact error. The maximum allowed length of this
// message is 8192 bytes.
Problem string
}
// NewErrorGeneric creates a new ErrorGeneric message.
func NewErrorGeneric() *ErrorGeneric {
return &ErrorGeneric{}
}
// A compile time check to ensure ErrorGeneric implements the lnwire.Message
// interface.
var _ Message = (*ErrorGeneric)(nil)
// Decode deserializes a serialized ErrorGeneric message stored in the
// passed io.Reader observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *ErrorGeneric) Decode(r io.Reader, pver uint32) error {
// ChannelPoint(8)
// Problem
err := readElements(r,
&c.ChannelPoint,
&c.Code,
&c.Problem,
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&c.PendingChannelID,
)
if err != nil {
return err
}
return nil
}
// Encode serializes the target ErrorGeneric into the passed io.Writer
// observing the protocol version specified.
//
// This is part of the lnwire.Message interface.
func (c *ErrorGeneric) Encode(w io.Writer, pver uint32) error {
err := writeElements(w,
c.ChannelPoint,
c.Code,
c.Problem,
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c.PendingChannelID,
)
if err != nil {
return err
}
return nil
}
// Command returns the integer uniquely identifying an ErrorGeneric message on
// the wire.
//
// This is part of the lnwire.Message interface.
func (c *ErrorGeneric) Command() uint32 {
return CmdErrorGeneric
}
// MaxPayloadLength returns the maximum allowed payload size for a
// ErrorGeneric complete message observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *ErrorGeneric) MaxPayloadLength(uint32) uint32 {
// 8+8192
return 8208
}
// Validate performs any necessary sanity checks to ensure all fields present
// on the ErrorGeneric are valid.
//
// This is part of the lnwire.Message interface.
func (c *ErrorGeneric) Validate() error {
if len(c.Problem) > 8192 {
return fmt.Errorf("problem string length too long")
}
// We're good!
return nil
}