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optimize(matchers): ReadLine block #93

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optimize(matchers): ReadLine block #93

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13 changes: 12 additions & 1 deletion matchers.go
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Original file line number Diff line number Diff line change
Expand Up @@ -86,17 +86,28 @@ func TLS(versions ...int) Matcher {

const maxHTTPRead = 4096

var httpMethodByte = map[byte]struct{}{'G': {}, 'P': {}, 'H': {}, 'D': {}, 'C': {}, 'O': {}, 'T': {}}

// HTTP1 parses the first line or upto 4096 bytes of the request to see if
// the conection contains an HTTP request.
func HTTP1() Matcher {
return func(r io.Reader) bool {
br := bufio.NewReader(&io.LimitedReader{R: r, N: maxHTTPRead})
firstByte, err := br.ReadByte()
if err != nil {
return false
}
_, ok := httpMethodByte[firstByte]
if !ok {
return false
}

l, part, err := br.ReadLine()
if err != nil || part {
return false
}

_, _, proto, ok := parseRequestLine(string(l))
_, _, proto, ok := parseRequestLine(string(firstByte) + string(l))
if !ok {
return false
}
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