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undo CL 95760043 / b2131d729e52

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Breaks Camlistore by introducing a datarace. See comments on
https://golang.org/cl/95760043/ for details.

I'll add a new test to lock-in the current behavior in a
subsequent CL.

I don't think Camlistore is particularly unique here: it's doing
the obvious thing to stream a multipart body to a server
using a goroutine feeding the multipart writer.

««« original CL description
mime/multipart: delay reading random source

If a user sets his/her own boundary string with SetBoundary,
we don't need to call randomBoundary at all.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/95760043
»»»

LGTM=ruiu
R=ruiu
CC=golang-codereviews, mathieu.lonjaret
https://golang.org/cl/117600043
This commit is contained in:
Brad Fitzpatrick 2014-08-05 11:36:44 -07:00
parent d0e255f259
commit dab671b660
1 changed files with 6 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/pkg/mime/multipart/writer.go
View File

@ -26,14 +26,12 @@ type Writer struct {
func NewWriter(w io.Writer) *Writer { func NewWriter(w io.Writer) *Writer {
return &Writer{ return &Writer{
w: w, w: w,
boundary: randomBoundary(),
} }
} }
// Boundary returns the Writer's boundary. // Boundary returns the Writer's boundary.
func (w *Writer) Boundary() string { func (w *Writer) Boundary() string {
if w.boundary == "" {
w.boundary = randomBoundary()
}
return w.boundary return w.boundary
} }
@ -67,7 +65,7 @@ func (w *Writer) SetBoundary(boundary string) error {
// FormDataContentType returns the Content-Type for an HTTP // FormDataContentType returns the Content-Type for an HTTP
// multipart/form-data with this Writer's Boundary. // multipart/form-data with this Writer's Boundary.
func (w *Writer) FormDataContentType() string { func (w *Writer) FormDataContentType() string {
return "multipart/form-data; boundary=" + w.Boundary() return "multipart/form-data; boundary=" + w.boundary
} }
func randomBoundary() string { func randomBoundary() string {
@ -91,9 +89,9 @@ func (w *Writer) CreatePart(header textproto.MIMEHeader) (io.Writer, error) {
} }
var b bytes.Buffer var b bytes.Buffer
if w.lastpart != nil { if w.lastpart != nil {
fmt.Fprintf(&b, "\r\n--%s\r\n", w.Boundary()) fmt.Fprintf(&b, "\r\n--%s\r\n", w.boundary)
} else { } else {
fmt.Fprintf(&b, "--%s\r\n", w.Boundary()) fmt.Fprintf(&b, "--%s\r\n", w.boundary)
} }
// TODO(bradfitz): move this to textproto.MimeHeader.Write(w), have it sort // TODO(bradfitz): move this to textproto.MimeHeader.Write(w), have it sort
// and clean, like http.Header.Write(w) does. // and clean, like http.Header.Write(w) does.
@ -159,7 +157,7 @@ func (w *Writer) Close() error {
} }
w.lastpart = nil w.lastpart = nil
} }
_, err := fmt.Fprintf(w.w, "\r\n--%s--\r\n", w.Boundary()) _, err := fmt.Fprintf(w.w, "\r\n--%s--\r\n", w.boundary)
return err return err
} }