types

var (
	// WorkingDagDB represents the current opened dag database.
	WorkingDagDB *bolt.DB

	// ErrDagAlreadyExists represents an error describing
	// the attempted overwriting of an existing DAG.
	ErrDagAlreadyExists = errors.New("dag already exists")

	// ErrDagDbNotOpened represents an error describing the attempted appending of a data set
	// to the working dag, despite the fact that the dag db has not yet been opened.
	ErrDagDbNotOpened = errors.New("dag db has not been opened")

	// ErrNilTransaction represents an error describing a transaction pointer of nil value.
	ErrNilTransaction = errors.New("transaction pointer is nil")

	// ErrNilTransactionAtHash represents an error describing a transaction pointer of nil value discovered through the
	// querying of the working db for an invalid hash.
	ErrNilTransactionAtHash = errors.New("no transaction exists in the dag with given hash")

	// ErrNilGenesis represents an error describing a genesis value of nil.
	ErrNilGenesis = errors.New("dag does not have a valid genesis")

	// ErrNilSignature represents an error describing a transaction lacking a signature.
	ErrNilSignature = errors.New("transaction has no signature")

	// ErrDuplicateTransaction represents an error describing a duplicate transaction entry in the given working dag db.
	ErrDuplicateTransaction = errors.New("transaction already exists in dag")

	// ErrInvalidSignature represents an error describing an
	ErrInvalidSignature = errors.New("signature invalid")
)

var (
	// ErrNoWorkingHost represents an error describing a p2p.WorkingHost value of nil.
	ErrNoWorkingHost = errors.New("no valid global host was found")

	// BestTransactionRequest represents the global best transaction request message byte value.
	BestTransactionRequest = []byte("best_transaction_request")

	// TransactionRequest represents the global transaction request message byte value.
	TransactionRequest = []byte("transaction_request")

	// GenesisHashRequest represents the global genesis transaction request message byte value.
	GenesisHashRequest = []byte("genesis_hash_request")
)

var (
	// ErrAlreadySigned defines an error describing a situation in which a message has already been signed.
	ErrAlreadySigned = errors.New("already signed")

	// ErrNilHash defines an error describing a situation in which a message has no hash.
	ErrNilHash = errors.New("hash not set")
)