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net/http: improve performance for parsePostForm
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>
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@ -1015,18 +1015,8 @@ func parsePostForm(r *Request) (vs url.Values, err error) {
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maxFormSize = int64(10 << 20) // 10 MB is a lot of text.
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reader = io.LimitReader(r.Body, maxFormSize+1)
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}
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b, e := ioutil.ReadAll(reader)
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if e != nil {
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if err == nil {
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err = e
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}
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break
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}
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if int64(len(b)) > maxFormSize {
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err = errors.New("http: POST too large")
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return
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}
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vs, e = url.ParseQuery(string(b))
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vs = make(url.Values)
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e := parsePostFormURLEncoded(vs, reader, maxFormSize)
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if err == nil {
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err = e
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}
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@ -1041,6 +1031,52 @@ func parsePostForm(r *Request) (vs url.Values, err error) {
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return
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}
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// parsePostFormURLEncoded reads from r, the reader of a POST form to populate vs which is a url-type values.
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// maxFormSize indicates the maximum number of bytes that will be read from r.
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func parsePostFormURLEncoded(vs url.Values, r io.Reader, maxFormSize int64) error {
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br := newBufioReader(r)
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defer putBufioReader(br)
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var readSize int64
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for {
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// Read next "key=value&" or "justkey&".
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// If this is the last pair, b will contain just "key=value" or "justkey".
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b, err := br.ReadBytes('&')
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if err != nil && err != io.EOF && err != bufio.ErrBufferFull {
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return err
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}
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isEOF := err == io.EOF
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readSize += int64(len(b))
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if readSize >= maxFormSize {
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return errors.New("http: POST too large")
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}
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// Remove last delimiter
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if len(b) > 0 && b[len(b)-1] == '&' {
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b = b[:len(b)-1]
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}
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// Parse key and value
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k := string(b)
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var v string
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if i := strings.Index(k, "="); i > -1 {
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k, v = k[:i], k[i+1:]
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}
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if k, err = url.QueryUnescape(k); err != nil {
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return err
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}
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if v, err = url.QueryUnescape(v); err != nil {
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return err
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}
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// Populate vs
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vs[k] = append(vs[k], v)
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if isEOF {
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return nil
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}
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}
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}
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// ParseForm parses the raw query from the URL and updates r.Form.
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//
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// For POST or PUT requests, it also parses the request body as a form and
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@ -30,8 +30,8 @@ func TestQuery(t *testing.T) {
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}
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func TestPostQuery(t *testing.T) {
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req, _ := NewRequest("POST", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not",
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strings.NewReader("z=post&both=y&prio=2&empty="))
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req, _ := NewRequest("POST", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not&orphan=nope",
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strings.NewReader("z=post&both=y&prio=2&orphan&empty="))
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded; param=value")
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if q := req.FormValue("q"); q != "foo" {
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@ -58,11 +58,26 @@ func TestPostQuery(t *testing.T) {
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if empty := req.FormValue("empty"); empty != "" {
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t.Errorf(`req.FormValue("empty") = %q, want "" (from body)`, empty)
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}
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if orphan := req.FormValue("orphan"); orphan != "" {
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t.Errorf(`req.FormValue("orphan") = %q, want "" (from body)`, orphan)
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}
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}
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func BenchmarkPostQuery(b *testing.B) {
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req, _ := NewRequest("POST", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not&orphan=nope",
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strings.NewReader("z=post&both=y&prio=2&orphan&empty="))
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded; param=value")
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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req.PostForm = nil
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req.ParseForm()
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}
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}
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func TestPatchQuery(t *testing.T) {
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req, _ := NewRequest("PATCH", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not",
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strings.NewReader("z=post&both=y&prio=2&empty="))
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req, _ := NewRequest("PATCH", "http://www.google.com/search?q=foo&q=bar&both=x&prio=1&empty=not&orphan=nope",
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strings.NewReader("z=post&both=y&prio=2&orphan&empty="))
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded; param=value")
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if q := req.FormValue("q"); q != "foo" {
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@ -89,6 +104,9 @@ func TestPatchQuery(t *testing.T) {
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if empty := req.FormValue("empty"); empty != "" {
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t.Errorf(`req.FormValue("empty") = %q, want "" (from body)`, empty)
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}
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if orphan := req.FormValue("orphan"); orphan != "" {
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t.Errorf(`req.FormValue("orphan") = %q, want "" (from body)`, orphan)
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}
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}
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type stringMap map[string][]string
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