github.com/csfrancis/docker@v1.8.0-rc2/pkg/ioutils/writeflusher.go (about)

     1  package ioutils
     2  
     3  import (
     4  	"io"
     5  	"net/http"
     6  	"sync"
     7  )
     8  
     9  type WriteFlusher struct {
    10  	sync.Mutex
    11  	w       io.Writer
    12  	flusher http.Flusher
    13  	flushed bool
    14  }
    15  
    16  func (wf *WriteFlusher) Write(b []byte) (n int, err error) {
    17  	wf.Lock()
    18  	defer wf.Unlock()
    19  	n, err = wf.w.Write(b)
    20  	wf.flushed = true
    21  	wf.flusher.Flush()
    22  	return n, err
    23  }
    24  
    25  // Flush the stream immediately.
    26  func (wf *WriteFlusher) Flush() {
    27  	wf.Lock()
    28  	defer wf.Unlock()
    29  	wf.flushed = true
    30  	wf.flusher.Flush()
    31  }
    32  
    33  func (wf *WriteFlusher) Flushed() bool {
    34  	wf.Lock()
    35  	defer wf.Unlock()
    36  	return wf.flushed
    37  }
    38  
    39  func NewWriteFlusher(w io.Writer) *WriteFlusher {
    40  	var flusher http.Flusher
    41  	if f, ok := w.(http.Flusher); ok {
    42  		flusher = f
    43  	} else {
    44  		flusher = &NopFlusher{}
    45  	}
    46  	return &WriteFlusher{w: w, flusher: flusher}
    47  }