utils

Documentation

Index

• func DecodeAndReverseHexString(hexStr string) ([]byte, error)
• func DisableCanonicalMode(optionalLogger ...Logger) *ttyState
• func GetBitcoinHash(b []byte) []byte
• func RestoreTTY(state *ttyState)
• func ReverseSlice[T any](a []T) []T
• func SafeSend[T any](ch chan T, t T) bool
• func Sha256d(b []byte) []byte
• type Logger

Functions

func DecodeAndReverseHexString

func DecodeAndReverseHexString(hexStr string) ([]byte, error)

DecideAndReverseHexString decodes the given hex string and then reverses the bytes. This is useful for converting Bitcoin hex strings to byte slices in little endian format.

func DisableCanonicalMode

func DisableCanonicalMode(optionalLogger ...Logger) *ttyState

DisableCanonicalMode disables canonical mode on the terminal. This allows for reading single characters without pressing enter. The previous state is returned and can be used to restore the previous state. The optionalLogger can be used a preferred logger. If no optionalLogger is provided, a default logger is used.

Usage in main.go: defer utils.RestoreTTY(utils.DisableCanonicalMode())

func GetBitcoinHash

func GetBitcoinHash(b []byte) []byte

GetBitcoinHash calculates the Bitcoin hash of the given bytes. The Bitcoin hash is the double SHA-256 hash of the given bytes which is then reversed. For transactions the entire transaction bytes are hashed; for blocks only the header (80 bytes) is hashed.

func RestoreTTY

func RestoreTTY(state *ttyState)

RestoreTTY restores the previous state of the terminal. The previous state is returned by DisableCanonicalMode. If the ttyState is nil, nothing is done.

func ReverseSlice

func ReverseSlice[T any](a []T) []T

ReverseSlice reverses the order of the items in the slice. The slice is modified in place. The slice is returned for convenience. The slice can be of any type. The slice can be nil. The slice can be empty. The slice can contain any number of items.

func SafeSend

func SafeSend[T any](ch chan T, t T) bool

SafeSend is a helper function that sends a value on a channel and returns. It is safe to use with closed channels. It uses go generics to allow for any type of channel.

func Sha256d

func Sha256d(b []byte) []byte

Sha256d calculates hash(hash(b)) and returns the resulting bytes.

Types

type Logger

type Logger interface {
	Infof(format string, args ...interface{})
	Warnf(format string, args ...interface{})
	Errorf(format string, args ...interface{})
	Fatalf(format string, args ...interface{})
}