github.com/1aal/kubeblocks@v0.0.0-20231107070852-e1c03e598921/pkg/lorry/engines/postgres/local_command.go (about)

     1  /*
     2  Copyright (C) 2022-2023 ApeCloud Co., Ltd
     3  
     4  This file is part of KubeBlocks project
     5  
     6  This program is free software: you can redistribute it and/or modify
     7  it under the terms of the GNU Affero General Public License as published by
     8  the Free Software Foundation, either version 3 of the License, or
     9  (at your option) any later version.
    10  
    11  This program is distributed in the hope that it will be useful
    12  but WITHOUT ANY WARRANTY; without even the implied warranty of
    13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14  GNU Affero General Public License for more details.
    15  
    16  You should have received a copy of the GNU Affero General Public License
    17  along with this program.  If not, see <http://www.gnu.org/licenses/>.
    18  */
    19  
    20  package postgres
    21  
    22  import (
    23  	"bytes"
    24  	"os/exec"
    25  
    26  	"github.com/pkg/errors"
    27  )
    28  
    29  type execCommand struct {
    30  	*exec.Cmd
    31  	Stdout *bytes.Buffer
    32  	Stderr *bytes.Buffer
    33  }
    34  
    35  func NewExecCommander(name string, args ...string) LocalCommand {
    36  	execCmd := exec.Command(name, args...)
    37  
    38  	var stdout, stderr bytes.Buffer
    39  	execCmd.Stdout = &stdout
    40  	execCmd.Stderr = &stderr
    41  	return &execCommand{
    42  		Cmd:    execCmd,
    43  		Stdout: &stdout,
    44  		Stderr: &stderr,
    45  	}
    46  }
    47  
    48  func (cmd *execCommand) GetStdout() *bytes.Buffer {
    49  	return cmd.Stdout
    50  }
    51  
    52  func (cmd *execCommand) GetStderr() *bytes.Buffer {
    53  	return cmd.Stderr
    54  }
    55  
    56  var LocalCommander = NewExecCommander
    57  
    58  func ExecCommand(name string, args ...string) (string, error) {
    59  	cmd := LocalCommander(name, args...)
    60  
    61  	err := cmd.Run()
    62  	if err != nil || cmd.GetStderr().String() != "<nil>" {
    63  		return "", errors.Errorf("exec command %s failed, err:%v, stderr:%s", name, err, cmd.GetStderr().String())
    64  	}
    65  
    66  	return cmd.GetStdout().String(), nil
    67  }
    68  
    69  func Psql(args ...string) (string, error) {
    70  	return ExecCommand("psql", args...)
    71  }
    72  
    73  func PgCtl(arg string) (string, error) {
    74  	args := []string{"-c"}
    75  	args = append(args, "pg_ctl "+arg)
    76  	args = append(args, "postgres")
    77  
    78  	return ExecCommand("su", args...)
    79  }
    80  
    81  func PgWalDump(args ...string) (string, error) {
    82  	return ExecCommand("pg_waldump", args...)
    83  }
    84  
    85  func PgRewind(args ...string) (string, error) {
    86  	return ExecCommand("pg_rewind", args...)
    87  }
    88  
    89  type FakeCommand struct {
    90  	Stdout     *bytes.Buffer
    91  	Stderr     *bytes.Buffer
    92  	RunnerFunc func() error
    93  }
    94  
    95  func NewFakeCommander(f func() error, stdout, stderr *bytes.Buffer) func(name string, args ...string) LocalCommand {
    96  	return func(name string, args ...string) LocalCommand {
    97  		return &FakeCommand{
    98  			RunnerFunc: f,
    99  			Stdout:     stdout,
   100  			Stderr:     stderr,
   101  		}
   102  	}
   103  }
   104  
   105  func (cmd *FakeCommand) Run() error {
   106  	return cmd.RunnerFunc()
   107  }
   108  
   109  func (cmd *FakeCommand) GetStdout() *bytes.Buffer {
   110  	return cmd.Stdout
   111  }
   112  
   113  func (cmd *FakeCommand) GetStderr() *bytes.Buffer {
   114  	return cmd.Stderr
   115  }