broadcast.go

package cli

import (
	"io/ioutil"
	"os"

	"github.com/spf13/cobra"
	amino "github.com/tendermint/go-amino"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/client/context"
	"github.com/cosmos/cosmos-sdk/x/auth"
)

// GetSignCommand returns the sign command
func GetBroadcastCommand(codec *amino.Codec) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "broadcast <file>",
		Short: "Broadcast transactions generated offline",
		Long: `Broadcast transactions created with the --generate-only flag and signed with the sign command.
Read a transaction from <file> and broadcast it to a node. If you supply a dash (-) argument
in place of an input filename, the command reads from standard input.`,
		Args: cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) (err error) {
			cliCtx := context.NewCLIContext().WithCodec(codec)
			stdTx, err := readAndUnmarshalStdTx(cliCtx.Codec, args[0])
			if err != nil {
				return
			}

			txBytes, err := cliCtx.Codec.MarshalBinaryLengthPrefixed(stdTx)
			if err != nil {
				return
			}

			_, err = cliCtx.BroadcastTx(txBytes)
			return err
		},
	}

	return client.PostCommands(cmd)[0]
}

func readAndUnmarshalStdTx(cdc *amino.Codec, filename string) (stdTx auth.StdTx, err error) {
	var bytes []byte
	if filename == "-" {
		bytes, err = ioutil.ReadAll(os.Stdin)
	} else {
		bytes, err = ioutil.ReadFile(filename)
	}
	if err != nil {
		return
	}
	if err = cdc.UnmarshalJSON(bytes, &stdTx); err != nil {
		return
	}
	return
}