Helper defines the functions a bootstrapping implementation should provide.
type Helper interface {
// GenesisBlock should return the genesis block required to bootstrap
// the ledger (be it reading from the filesystem, generating it, etc.)
GenesisBlock() *ab.Block
}
Replacer provides the ability to to replace the current genesis block used for bootstrapping with the supplied block. It is used during consensus-type migration in order to replace the original genesis block used for bootstrapping with the latest config block of the system channel, which contains the new consensus-type. This will ensure the instantiation of the correct consenter type when the server restarts.
type Replacer interface {
// ReplaceGenesisBlockFile should first copy the current file to a backup
// file: <genesis-file-name> => <genesis-file-name>.bak
// and then overwrite the original file with the content of the given block.
// If something goes wrong during migration, the original file could be
// restored from the backup.
// An error is returned if the operation was not completed successfully.
ReplaceGenesisBlockFile(block *ab.Block) error
// CheckReadWrite checks whether the current file is readable and writable,
// because if it is not, there is no point in attempting to replace. This
// check is performed at the beginning of the consensus-type migration
// process.
// An error is returned if the file is not readable and writable.
CheckReadWrite() error
}