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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package util
import (
"io"
"os"
"os/exec"
"sync"
"time"
)
// ExecAndCaptureOutput runs the specified command and args and captures
// stdout into a string, returning the string or an error upon completion.
func ExecAndCaptureOutput(command string, args ...string) (string, string, error) {
rStdout, wStdout, err := os.Pipe()
if err != nil {
return "", "", err
}
rStderr, wStderr, err := os.Pipe()
if err != nil {
return "", "", err
}
subcmd := exec.Command(command, args...)
subcmd.Stdout = wStdout
subcmd.Stderr = wStderr
outputStdout := make([]byte, 0, 10240)
outputStderr := make([]byte, 0, 1024)
var wg sync.WaitGroup
wg.Add(2)
reader := func(input *os.File, output *[]byte) {
defer wg.Done()
for {
buf := make([]byte, 1024)
read, e := input.Read(buf)
if e == io.EOF {
break
}
if read > 0 {
*output = append(*output, buf[0:read]...)
} else {
time.Sleep(time.Microsecond)
}
}
}
go reader(rStdout, &outputStdout)
go reader(rStderr, &outputStderr)
err = subcmd.Run()
wStdout.Close()
wStderr.Close()
wg.Wait()
return string(outputStdout), string(outputStderr), err
}
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