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104 lines
3.2 KiB
104 lines
3.2 KiB
package light
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import (
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"errors"
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"fmt"
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"time"
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"github.com/tendermint/tendermint/types"
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)
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// ErrOldHeaderExpired means the old (trusted) header has expired according to
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// the given trustingPeriod and current time. If so, the light client must be
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// reset subjectively.
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type ErrOldHeaderExpired struct {
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At time.Time
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Now time.Time
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}
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func (e ErrOldHeaderExpired) Error() string {
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return fmt.Sprintf("old header has expired at %v (now: %v)", e.At, e.Now)
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}
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// ErrNewValSetCantBeTrusted means the new validator set cannot be trusted
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// because < 1/3rd (+trustLevel+) of the old validator set has signed.
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type ErrNewValSetCantBeTrusted struct {
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Reason types.ErrNotEnoughVotingPowerSigned
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}
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func (e ErrNewValSetCantBeTrusted) Error() string {
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return fmt.Sprintf("cant trust new val set: %v", e.Reason)
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}
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// ErrInvalidHeader means the header either failed the basic validation or
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// commit is not signed by 2/3+.
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type ErrInvalidHeader struct {
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Reason error
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}
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func (e ErrInvalidHeader) Error() string {
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return fmt.Sprintf("invalid header: %v", e.Reason)
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}
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// ErrFailedHeaderCrossReferencing is returned when the detector was not able to cross reference the header
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// with any of the connected witnesses.
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var ErrFailedHeaderCrossReferencing = errors.New("all witnesses have either not responded, don't have the " +
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" blocks or sent invalid blocks. You should look to change your witnesses" +
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" or review the light client's logs for more information")
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// ErrVerificationFailed means either sequential or skipping verification has
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// failed to verify from header #1 to header #2 due to some reason.
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type ErrVerificationFailed struct {
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From int64
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To int64
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Reason error
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}
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// Unwrap returns underlying reason.
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func (e ErrVerificationFailed) Unwrap() error {
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return e.Reason
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}
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func (e ErrVerificationFailed) Error() string {
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return fmt.Sprintf("verify from #%d to #%d failed: %v", e.From, e.To, e.Reason)
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}
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// ErrLightClientAttack is returned when the light client has detected an attempt
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// to verify a false header and has sent the evidence to either a witness or primary.
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var ErrLightClientAttack = errors.New("attempted attack detected." +
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" Light client received valid conflicting header from witness." +
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" Unable to verify header. Evidence has been sent to both providers." +
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" Check logs for full evidence and trace")
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// ----------------------------- INTERNAL ERRORS ---------------------------------
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// ErrConflictingHeaders is thrown when two conflicting headers are discovered.
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type errConflictingHeaders struct {
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Block *types.LightBlock
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WitnessIndex int
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}
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func (e errConflictingHeaders) Error() string {
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return fmt.Sprintf(
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"header hash (%X) from witness (%d) does not match primary",
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e.Block.Hash(), e.WitnessIndex)
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}
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// errNoWitnesses means that there are not enough witnesses connected to
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// continue running the light client.
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type errNoWitnesses struct{}
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func (e errNoWitnesses) Error() string {
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return "no witnesses connected. please reset light client"
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}
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// errBadWitness is returned when the witness either does not respond or
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// responds with an invalid header.
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type errBadWitness struct {
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Reason error
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WitnessIndex int
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}
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func (e errBadWitness) Error() string {
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return fmt.Sprintf("Witness %d returned error: %s", e.WitnessIndex, e.Reason.Error())
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}
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