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net/http: improve performance for parsePostForm

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Remove the use of io.ReadAll in http.parsePostForm to avoid converting
the whole input from []byte to string and not performing well
space-allocated-wise.

Instead a new function called parsePostFormURLEncoded is used and is
fed directly an io.Reader that is parsed using a bufio.Reader.

Benchmark:

name         old time/op    new time/op    delta
PostQuery-4    2.90µs ± 6%    2.82µs ± 4%     ~       (p=0.094 n=9+9)

name         old alloc/op   new alloc/op   delta
PostQuery-4    1.05kB ± 0%    0.90kB ± 0%  -14.49%  (p=0.000 n=10+10)

name         old allocs/op  new allocs/op  delta
PostQuery-4      6.00 ± 0%      7.00 ± 0%  +16.67%  (p=0.000 n=10+10)

Fixes #14655

Change-Id: I112c263d4221d959ed6153cfe88bc57a2aa8ea73
Reviewed-on: https://go-review.googlesource.com/20301
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Quentin Renard 2016-03-06 17:27:50 +01:00 committed by Brad Fitzpatrick
parent e6051de035
commit 59320c396e
2 changed files with 70 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
src/net/http/request.go
View File

@ -1015,18 +1015,8 @@ func parsePostForm(r *Request) (vs url.Values, err error) {
maxFormSize = int64(10 << 20) // 10 MB is a lot of text.
reader = io.LimitReader(r.Body, maxFormSize+1)
}
b, e := ioutil.ReadAll(reader)
if e != nil {
if err == nil {
err = e
}
break
}
if int64(len(b)) > maxFormSize {
err = errors.New("http: POST too large")
return
}
vs, e = url.ParseQuery(string(b))
vs = make(url.Values)
e := parsePostFormURLEncoded(vs, reader, maxFormSize)
if err == nil {
err = e
}
@ -1041,6 +1031,52 @@ func parsePostForm(r *Request) (vs url.Values, err error) {
return
}
// parsePostFormURLEncoded reads from r, the reader of a POST form to populate vs which is a url-type values.
// maxFormSize indicates the maximum number of bytes that will be read from r.
func parsePostFormURLEncoded(vs url.Values, r io.Reader, maxFormSize int64) error {
br := newBufioReader(r)
defer putBufioReader(br)
var readSize int64
for {
// Read next "key=value&" or "justkey&".
// If this is the last pair, b will contain just "key=value" or "justkey".
b, err := br.ReadBytes('&')
if err != nil && err != io.EOF && err != bufio.ErrBufferFull {
return err
}
isEOF := err == io.EOF
readSize += int64(len(b))
if readSize >= maxFormSize {
return errors.New("http: POST too large")
}
// Remove last delimiter
if len(b) > 0 && b[len(b)-1] == '&' {
b = b[:len(b)-1]
}
// Parse key and value
k := string(b)
var v string
if i := strings.Index(k, "="); i > -1 {
k, v = k[:i], k[i+1:]
}
if k, err = url.QueryUnescape(k); err != nil {
return err
}
if v, err = url.QueryUnescape(v); err != nil {
return err
}
// Populate vs
vs[k] = append(vs[k], v)
if isEOF {
return nil
}
}
}
// ParseForm parses the raw query from the URL and updates r.Form.
//
// For POST or PUT requests, it also parses the request body as a form and

26
src/net/http/request_test.go
View File

@ -30,8 +30,8 @@ func TestQuery(t *testing.T) {
}
func TestPostQuery(t *testing.T) {
req, _ := NewRequest("POST", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not",
strings.NewReader("z=post&both=y&prio=2&empty="))
req, _ := NewRequest("POST", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not&orphan=nope",
strings.NewReader("z=post&both=y&prio=2&orphan&empty="))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded; param=value")
if q := req.FormValue("q"); q != "foo" {
@ -58,11 +58,26 @@ func TestPostQuery(t *testing.T) {
if empty := req.FormValue("empty"); empty != "" {
t.Errorf(`req.FormValue("empty") = %q, want "" (from body)`, empty)
}
if orphan := req.FormValue("orphan"); orphan != "" {
t.Errorf(`req.FormValue("orphan") = %q, want "" (from body)`, orphan)
}
}
func BenchmarkPostQuery(b *testing.B) {
req, _ := NewRequest("POST", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not&orphan=nope",
strings.NewReader("z=post&both=y&prio=2&orphan&empty="))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded; param=value")
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
req.PostForm = nil
req.ParseForm()
}
}
func TestPatchQuery(t *testing.T) {
req, _ := NewRequest("PATCH", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not",
strings.NewReader("z=post&both=y&prio=2&empty="))
req, _ := NewRequest("PATCH", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not&orphan=nope",
strings.NewReader("z=post&both=y&prio=2&orphan&empty="))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded; param=value")
if q := req.FormValue("q"); q != "foo" {
@ -89,6 +104,9 @@ func TestPatchQuery(t *testing.T) {
if empty := req.FormValue("empty"); empty != "" {
t.Errorf(`req.FormValue("empty") = %q, want "" (from body)`, empty)
}
if orphan := req.FormValue("orphan"); orphan != "" {
t.Errorf(`req.FormValue("orphan") = %q, want "" (from body)`, orphan)
}
}
type stringMap map[string][]string