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package provider
import (
"github.com/tendermint/tendermint/types"
)
// Provider provides information for the lite client to sync (verification
// happens in the client).
type Provider interface {
// ChainID returns the blockchain ID.
ChainID() string
// SignedHeader returns the SignedHeader that corresponds to the given
// height.
//
// 0 - the latest.
// height must be >= 0.
//
// If the provider fails to fetch the SignedHeader due to the IO or other
// issues, an error will be returned.
// If there's no SignedHeader for the given height, ErrSignedHeaderNotFound
// error is returned.
SignedHeader(height int64) (*types.SignedHeader, error)
// ValidatorSet returns the ValidatorSet that corresponds to height.
//
// 0 - the latest.
// height must be >= 0.
//
// If the provider fails to fetch the ValidatorSet due to the IO or other
// issues, an error will be returned.
// If there's no ValidatorSet for the given height, ErrValidatorSetNotFound
// error is returned.
ValidatorSet(height int64) (*types.ValidatorSet, error)
}