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package lite
import (
"errors"
"fmt"
"time"
"github.com/tendermint/tendermint/crypto/tmhash"
)
// TrustOptions are the trust parameters needed when a new light client
// connects to the network or when an existing light client that has been
// offline for longer than the trusting period connects to the network.
//
// The expectation is the user will get this information from a trusted source
// like a validator, a friend, or a secure website. A more user friendly
// solution with trust tradeoffs is that we establish an https based protocol
// with a default end point that populates this information. Also an on-chain
// registry of roots-of-trust (e.g. on the Cosmos Hub) seems likely in the
// future.
type TrustOptions struct {
// tp: trusting period.
//
// Should be significantly less than the unbonding period (e.g. unbonding
// period = 3 weeks, trusting period = 2 weeks).
//
// More specifically, trusting period + time needed to check headers + time
// needed to report and punish misbehavior should be less than the unbonding
// period.
Period time.Duration
// Header's Height and Hash must both be provided to force the trusting of a
// particular header.
Height int64
Hash []byte
}
// ValidateBasic performs basic validation.
func (opts TrustOptions) ValidateBasic() error {
if opts.Period <= 0 {
return errors.New("negative or zero period")
}
if opts.Height <= 0 {
return errors.New("negative or zero height")
}
if len(opts.Hash) != tmhash.Size {
return fmt.Errorf("expected hash size to be %d bytes, got %d bytes",
tmhash.Size,
len(opts.Hash),
)
}
return nil
}