github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/supervisor/client/client.go (about)

     1  /*
     2   * Copyright (C) 2020 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program is free software: you can redistribute it and/or modify
     5   * it under the terms of the GNU General Public License as published by
     6   * the Free Software Foundation, either version 3 of the License, or
     7   * (at your option) any later version.
     8   *
     9   * This program is distributed in the hope that it will be useful,
    10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   * GNU General Public License for more details.
    13   *
    14   * You should have received a copy of the GNU General Public License
    15   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package client
    19  
    20  import (
    21  	"bufio"
    22  	"errors"
    23  	"fmt"
    24  	"strings"
    25  
    26  	"github.com/rs/zerolog/log"
    27  )
    28  
    29  // Command executes supervisor command.
    30  func Command(args ...string) (result string, err error) {
    31  	cmdLine := strings.Join(args, " ")
    32  	log.Trace().Msgf("Supervisor command invoked: %q", cmdLine)
    33  	conn, err := connect()
    34  	if err != nil {
    35  		return "", err
    36  	}
    37  	defer conn.Close()
    38  
    39  	_, err = fmt.Fprintln(conn, cmdLine)
    40  	if err != nil {
    41  		return "", err
    42  	}
    43  
    44  	scanner := bufio.NewScanner(conn)
    45  	scanner.Scan()
    46  	line := string(scanner.Bytes())
    47  	parts := strings.SplitN(line, ": ", 2)
    48  	status := parts[0]
    49  	if status == "ok" {
    50  		if len(parts) > 1 {
    51  			result = parts[1]
    52  		}
    53  		return result, nil
    54  	}
    55  
    56  	message := strings.TrimPrefix(line, "error: ")
    57  	return "", errors.New(message)
    58  }