mirror of
https://gitee.com/rainbond/Rainbond.git
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97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
// RAINBOND, Application Management Platform
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// Copyright (C) 2014-2017 Goodrain Co., Ltd.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version. For any non-GPL usage of Rainbond,
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// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
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// must be obtained first.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package util
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import (
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"bytes"
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"io"
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"os/exec"
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)
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//PipeCommand PipeCommand
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type PipeCommand struct {
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stack []*exec.Cmd
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finalStdout, finalStderr io.Reader
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pipestack []*io.PipeWriter
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}
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//NewPipeCommand new pipe commands
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func NewPipeCommand(stack ...*exec.Cmd) (*PipeCommand, error) {
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var errorbuffer bytes.Buffer
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pipestack := make([]*io.PipeWriter, len(stack)-1)
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i := 0
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for ; i < len(stack)-1; i++ {
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stdinpipe, stdoutpipe := io.Pipe()
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stack[i].Stdout = stdoutpipe
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stack[i].Stderr = &errorbuffer
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stack[i+1].Stdin = stdinpipe
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pipestack[i] = stdoutpipe
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}
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finalStdout, err := stack[i].StdoutPipe()
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if err != nil {
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return nil, err
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}
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finalStderr, err := stack[i].StderrPipe()
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if err != nil {
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return nil, err
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}
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pipeCommand := &PipeCommand{
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stack: stack,
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pipestack: pipestack,
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finalStdout: finalStdout,
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finalStderr: finalStderr,
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}
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return pipeCommand, nil
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}
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//Run Run
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func (p *PipeCommand) Run() error {
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return call(p.stack, p.pipestack)
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}
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//GetFinalStdout get final command stdout reader
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func (p *PipeCommand) GetFinalStdout() io.Reader {
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return p.finalStdout
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}
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//GetFinalStderr get final command stderr reader
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func (p *PipeCommand) GetFinalStderr() io.Reader {
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return p.finalStderr
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}
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func call(stack []*exec.Cmd, pipes []*io.PipeWriter) (err error) {
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if stack[0].Process == nil {
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if err = stack[0].Start(); err != nil {
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return err
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}
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}
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if len(stack) > 1 {
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if err = stack[1].Start(); err != nil {
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return err
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}
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defer func() {
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if err == nil {
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pipes[0].Close()
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err = call(stack[1:], pipes[1:])
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}
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}()
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}
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return stack[0].Wait()
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}
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