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0ff138a477
This will cause sync issues with very fast output and will defeat the purpose of logging. Instead, buffer both stdout/stderr and show their output at the end.
93 lines
1.6 KiB
Go
93 lines
1.6 KiB
Go
package progress
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/**
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Inspired by the https://github.com/PumpkinSeed/cage module
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*/
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import (
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"bytes"
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"io"
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"os"
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"sync"
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)
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type captureData struct {
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backupStdout *os.File
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writerStdout *os.File
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backupStderr *os.File
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writerStderr *os.File
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DataStdOut *bytes.Buffer
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DataStdErr *bytes.Buffer
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outStdout chan []byte
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outStderr chan []byte
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}
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func startStdCapture() *captureData {
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rStdout, wStdout, errStdout := os.Pipe()
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if errStdout != nil {
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panic(errStdout)
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}
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rStderr, wStderr, errStderr := os.Pipe()
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if errStderr != nil {
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panic(errStderr)
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}
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c := &captureData{
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backupStdout: os.Stdout,
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writerStdout: wStdout,
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backupStderr: os.Stderr,
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writerStderr: wStderr,
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outStdout: make(chan []byte),
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outStderr: make(chan []byte),
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DataStdOut: &bytes.Buffer{},
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DataStdErr: &bytes.Buffer{},
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}
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os.Stdout = c.writerStdout
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os.Stderr = c.writerStderr
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stdCopy := func(out chan<- []byte, reader *os.File) {
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var buffer bytes.Buffer
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_, _ = io.Copy(&buffer, reader)
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if buffer.Len() > 0 {
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out <- buffer.Bytes()
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}
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}
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go stdCopy(c.outStdout, rStdout)
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go stdCopy(c.outStderr, rStderr)
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return c
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}
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func stopStdCapture(c *captureData) {
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_ = c.writerStdout.Close()
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_ = c.writerStderr.Close()
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var wg sync.WaitGroup
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stdRead := func(in <-chan []byte, outData *bytes.Buffer) {
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defer wg.Done()
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select {
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case out := <-in:
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outData.Write(out)
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default:
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//case <-time.After(10 * time.Millisecond):
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}
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}
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wg.Add(2)
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go stdRead(c.outStdout, c.DataStdOut)
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go stdRead(c.outStderr, c.DataStdErr)
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wg.Wait()
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os.Stdout = c.backupStdout
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os.Stderr = c.backupStderr
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}
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