39a59bbe6f
This commit introduces the requirement specified in BOLT#7, where we ignore any node announcements for a specific node if we yet haven't seen any channel announcements where this node takes part. This is to prevent someone DoS-ing the network with cheap node announcements. In the router this is enforced by requiring a call to AddNode(node_id) to be preceded by an AddEdge(edge_id) call, where node_id is one of the nodes in edge_id.
94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
package routing
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import "github.com/go-errors/errors"
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// errorCode is used to represent the various errors that can occur within this
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// package.
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type errorCode uint8
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const (
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// ErrNoPathFound is returned when a path to the target destination
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// does not exist in the graph.
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ErrNoPathFound errorCode = iota
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// ErrNoRouteFound is returned when the router is unable to find a
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// valid route to the target destination after fees and time-lock
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// limitations are factored in.
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ErrNoRouteFound
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// ErrInsufficientCapacity is returned when a path if found, yet the
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// capacity of one of the channels in the path is insufficient to carry
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// the payment.
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ErrInsufficientCapacity
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// ErrMaxHopsExceeded is returned when a candidate path is found, but
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// the length of that path exceeds HopLimit.
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ErrMaxHopsExceeded
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// ErrTargetNotInNetwork is returned when the target of a path-finding
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// or payment attempt isn't known to be within the current version of
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// the channel graph.
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ErrTargetNotInNetwork
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// ErrOutdated is returned when the routing update already have
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// been applied.
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ErrOutdated
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// ErrIgnored is returned when the update have been ignored because
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// this update can't bring us something new, or because a node
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// announcement was given for node not found in any channel.
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ErrIgnored
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)
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// routerError is a structure that represent the error inside the routing package,
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// this structure carries additional information about error code in order to
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// be able distinguish errors outside of the current package.
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type routerError struct {
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err *errors.Error
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code errorCode
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}
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// Error represents errors as the string
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// NOTE: Part of the error interface.
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func (e *routerError) Error() string {
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return e.err.Error()
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}
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// A compile time check to ensure routerError implements the error interface.
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var _ error = (*routerError)(nil)
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// newErr creates an routerError by the given error description and its
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// corresponding error code.
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func newErr(code errorCode, a interface{}) *routerError {
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return &routerError{
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code: code,
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err: errors.New(a),
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}
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}
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// newErrf creates an routerError by the given error formatted description and
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// its corresponding error code.
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func newErrf(code errorCode, format string, a ...interface{}) *routerError {
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return &routerError{
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code: code,
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err: errors.Errorf(format, a...),
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}
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}
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// IsError is a helper function which is needed to have ability to check that
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// returned error has specific error code.
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func IsError(e interface{}, codes ...errorCode) bool {
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err, ok := e.(*routerError)
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if !ok {
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return false
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}
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for _, code := range codes {
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if err.code == code {
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return true
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}
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}
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return false
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}
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