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package light
import (
"fmt"
"time"
"github.com/tendermint/tendermint/light/provider"
"github.com/tendermint/tendermint/types"
)
// ErrOldHeaderExpired means the old (trusted) header has expired according to
// the given trustingPeriod and current time. If so, the light client must be
// reset subjectively.
type ErrOldHeaderExpired struct {
At time.Time
Now time.Time
}
func (e ErrOldHeaderExpired) Error() string {
return fmt.Sprintf("old header has expired at %v (now: %v)", e.At, e.Now)
}
// ErrNewValSetCantBeTrusted means the new validator set cannot be trusted
// because < 1/3rd (+trustLevel+) of the old validator set has signed.
type ErrNewValSetCantBeTrusted struct {
Reason types.ErrNotEnoughVotingPowerSigned
}
func (e ErrNewValSetCantBeTrusted) Error() string {
return fmt.Sprintf("cant trust new val set: %v", e.Reason)
}
// ErrInvalidHeader means the header either failed the basic validation or
// commit is not signed by 2/3+.
type ErrInvalidHeader struct {
Reason error
}
func (e ErrInvalidHeader) Error() string {
return fmt.Sprintf("invalid header: %v", e.Reason)
}
// ErrConflictingHeaders is thrown when two conflicting headers are discovered.
type ErrConflictingHeaders struct {
H1 *types.SignedHeader
Primary provider.Provider
H2 *types.SignedHeader
Witness provider.Provider
}
func (e ErrConflictingHeaders) Error() string {
return fmt.Sprintf(
"header hash %X from primary %v does not match one %X from witness %v",
e.H1.Hash(), e.Primary,
e.H2.Hash(), e.Witness)
}
// ErrVerificationFailed means either sequential or skipping verification has
// failed to verify from header #1 to header #2 due to some reason.
type ErrVerificationFailed struct {
From int64
To int64
Reason error
}
// Unwrap returns underlying reason.
func (e ErrVerificationFailed) Unwrap() error {
return e.Reason
}
func (e ErrVerificationFailed) Error() string {
return fmt.Sprintf(
"verify from #%d to #%d failed: %v",
e.From, e.To, e.Reason)
}
// errNoWitnesses means that there are not enough witnesses connected to
// continue running the light client.
type errNoWitnesses struct{}
func (e errNoWitnesses) Error() string {
return "no witnesses connected. please reset light client"
}
type badWitnessCode int
const (
noResponse badWitnessCode = iota + 1
invalidHeader
invalidValidatorSet
)
// errBadWitness is returned when the witness either does not respond or
// responds with an invalid header.
type errBadWitness struct {
Reason error
Code badWitnessCode
WitnessIndex int
}
func (e errBadWitness) Error() string {
switch e.Code {
case noResponse:
return fmt.Sprintf("failed to get a header/vals from witness: %v", e.Reason)
case invalidHeader:
return fmt.Sprintf("witness sent us invalid header: %v", e.Reason)
case invalidValidatorSet:
return fmt.Sprintf("witness sent us invalid validator set: %v", e.Reason)
default:
return fmt.Sprintf("unknown code: %d", e.Code)
}
}