75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package input
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"syscall"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"golang.org/x/term"
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)
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// Terminal is a terminal used for input. If `nil`, stdin is used.
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var Terminal *term.Terminal
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// ReadWriter combiner reader and writer.
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type ReadWriter struct {
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io.Reader
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io.Writer
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}
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// ReadLine reads line from the input without trailing '\n'.
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func ReadLine(prompt string) (string, error) {
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trm := Terminal
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if trm == nil {
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s, err := term.MakeRaw(syscall.Stdin)
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if err != nil {
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panic(err)
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}
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defer func() { _ = term.Restore(syscall.Stdin, s) }()
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trm = term.NewTerminal(ReadWriter{
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Reader: os.Stdin,
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Writer: os.Stdout,
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}, "")
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}
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return readLine(trm, prompt)
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}
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func readLine(trm *term.Terminal, prompt string) (string, error) {
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_, err := trm.Write([]byte(prompt))
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if err != nil {
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return "", err
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}
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return trm.ReadLine()
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}
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// ReadPassword reads user password with prompt.
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func ReadPassword(prompt string) (string, error) {
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trm := Terminal
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if trm == nil {
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s, err := term.MakeRaw(syscall.Stdin)
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if err != nil {
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panic(err)
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}
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defer func() { _ = term.Restore(syscall.Stdin, s) }()
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trm = term.NewTerminal(ReadWriter{os.Stdin, os.Stdout}, prompt)
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}
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return trm.ReadPassword(prompt)
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}
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// ConfirmTx asks for a confirmation to send tx.
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func ConfirmTx(w io.Writer, tx *transaction.Transaction) error {
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fmt.Fprintf(w, "Network fee: %d\n", tx.NetworkFee)
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fmt.Fprintf(w, "System fee: %d\n", tx.SystemFee)
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fmt.Fprintf(w, "Total fee: %d\n", tx.NetworkFee+tx.SystemFee)
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ln, err := ReadLine("Relay transaction (y|N)> ")
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if err != nil {
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return err
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}
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if 0 < len(ln) && ln[0] == 'y' || ln[0] == 'Y' {
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return nil
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}
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return errors.New("cancelled")
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}
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