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[server] Implement "magic" for the Go HTTP2 headers writer.

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This commit is contained in:
Ciprian Dorin Craciun 2021-12-18 02:51:45 +02:00
parent 5609528a18
commit 0cfaf91034
1 changed files with 62 additions and 8 deletions
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70
sources/lib/server/headers-magic.go
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@ -80,8 +80,6 @@ func (_buffer *HttpResponseWriterHeadersBuffer) WriteToGenericHeaders (_headers
_headers[_name] = _values
}
}
_headers["Date"] = nil
}
@ -96,7 +94,7 @@ func (_buffer *HttpResponseWriterHeadersBuffer) WriteTo (_response http.Response
}
_responseRaw := *(*[2]uintptr) (unsafe.Pointer (&_response))
_responseRaw := * ((*[2]uintptr) (unsafe.Pointer (&_response)))
_responseType := _responseRaw[0]
@ -134,11 +132,21 @@ var _httpResponseWriterHeadersMagic_quicHttp3_type uintptr
func (_buffer *HttpResponseWriterHeadersBuffer) WriteToNetHttp1 (_response http.ResponseWriter) () {
_responseRaw := *(*[2]uintptr) (unsafe.Pointer (&_response))
_responseRaw := * ((*[2]uintptr) (unsafe.Pointer (&_response)))
_responseAddress := unsafe.Pointer (_responseRaw[1])
_headers := make (map[string][]string, 16)
_buffer.WriteToGenericHeaders (_headers)
// NOTE: It seems if `Content-Type` is missing, then Go HTTP divines a value...
if _, _exists := _headers["Content-Type"]; !_exists {
_headers["Content-Type"] = nil
}
// NOTE: It seems that Go HTTP always divines a `Date` value...
_headers["Date"] = nil
{
_handlerHeaderOffset := atomic.LoadInt32 (&_httpResponseWriterHeadersMagic_netHttp1_handlerHeaderOffset)
_cwHeaderOffset := atomic.LoadInt32 (&_httpResponseWriterHeadersMagic_netHttp1_cwHeaderOffset)
@ -150,7 +158,7 @@ func (_buffer *HttpResponseWriterHeadersBuffer) WriteToNetHttp1 (_response http.
*_cwHeaderValue = _headers
}
_buffer.WriteToGenericHeaders (_headers)
_response.WriteHeader (_buffer.status)
}
@ -158,7 +166,34 @@ func (_buffer *HttpResponseWriterHeadersBuffer) WriteToNetHttp1 (_response http.
func (_buffer *HttpResponseWriterHeadersBuffer) WriteToNetHttp2 (_response http.ResponseWriter) () {
_buffer.WriteToGenericResponse (_response)
_responseRaw := * ((*[2]uintptr) (unsafe.Pointer (&_response)))
_responseAddress := unsafe.Pointer (_responseRaw[1])
_responseAddress = unsafe.Pointer (* ((*uintptr) (_responseAddress)))
_headers := make (map[string][]string, 16)
_buffer.WriteToGenericHeaders (_headers)
// NOTE: It seems if `Content-Type` is missing, then Go HTTP divines a value...
if _, _exists := _headers["Content-Type"]; !_exists {
_headers["Content-Type"] = nil
}
// NOTE: It seems that Go HTTP always divines a `Date` value...
_headers["Date"] = nil
_response.WriteHeader (_buffer.status)
{
_handlerHeaderOffset := atomic.LoadInt32 (&_httpResponseWriterHeadersMagic_netHttp2_handlerHeaderOffset)
_snapHeaderOffset := atomic.LoadInt32 (&_httpResponseWriterHeadersMagic_netHttp2_snapHeaderOffset)
_handlerHeaderValue := (*http.Header) (unsafe.Add (_responseAddress, _handlerHeaderOffset))
_snapHeaderValue := (*http.Header) (unsafe.Add (_responseAddress, _snapHeaderOffset))
*_handlerHeaderValue = _headers
*_snapHeaderValue = _headers
}
}
@ -180,12 +215,11 @@ func _httpResponseWriterHeadersMagic_detect (_response http.ResponseWriter) {
// This eliminates the `http.Header.Clone()` call on `WriteHeader`.
_responseReflect := reflect.ValueOf (_response) .Elem ()
_responseAddress := unsafe.Pointer (_responseReflect.UnsafeAddr ())
_responseType := _responseReflect.Type ()
_responsePackage := _responseType.PkgPath ()
_responseTypeName := _responseType.Name ()
_responseRaw := *(*[2]uintptr) (unsafe.Pointer (&_response))
_responseRaw := * ((*[2]uintptr) (unsafe.Pointer (&_response)))
_responseRawType := _responseRaw[0]
switch {
@ -200,6 +234,7 @@ func _httpResponseWriterHeadersMagic_detect (_response http.ResponseWriter) {
_cwHeaderReflect := _responseReflect.FieldByName ("cw") .FieldByName ("header")
_cwHeaderAddress := unsafe.Pointer (_cwHeaderReflect.UnsafeAddr ())
_responseAddress := unsafe.Pointer (_responseReflect.UnsafeAddr ())
_handlerHeaderOffset := int32 (int64 (uintptr (_handlerHeaderAddress)) - int64 (uintptr (_responseAddress)))
_cwHeaderOffset := int32 (int64 (uintptr (_cwHeaderAddress)) - int64 (uintptr (_responseAddress)))
@ -213,6 +248,22 @@ func _httpResponseWriterHeadersMagic_detect (_response http.ResponseWriter) {
log.Printf ("[dd] [cfb457eb] [magic...] detected NetHttp2 (`%s.%s`) with type `%08x`;", _responsePackage, _responseTypeName, _responseRawType)
_responseReflect = _responseReflect.FieldByName ("rws") .Elem ()
_handlerHeaderReflect := _responseReflect.FieldByName ("handlerHeader")
_handlerHeaderAddress := unsafe.Pointer (_handlerHeaderReflect.UnsafeAddr ())
_snapHeaderReflect := _responseReflect.FieldByName ("snapHeader")
_snapHeaderAddress := unsafe.Pointer (_snapHeaderReflect.UnsafeAddr ())
_responseAddress := unsafe.Pointer (_responseReflect.UnsafeAddr ())
_handlerHeaderOffset := int32 (int64 (uintptr (_handlerHeaderAddress)) - int64 (uintptr (_responseAddress)))
_snapHeaderOffset := int32 (int64 (uintptr (_snapHeaderAddress)) - int64 (uintptr (_responseAddress)))
atomic.StoreInt32 (&_httpResponseWriterHeadersMagic_netHttp2_handlerHeaderOffset, _handlerHeaderOffset)
atomic.StoreInt32 (&_httpResponseWriterHeadersMagic_netHttp2_snapHeaderOffset, _snapHeaderOffset)
atomic.StoreUintptr (&_httpResponseWriterHeadersMagic_netHttp2_type, _responseRawType)
}
@ -241,3 +292,6 @@ var _httpResponseWriterHeadersMagic_panic = true
var _httpResponseWriterHeadersMagic_netHttp1_handlerHeaderOffset int32
var _httpResponseWriterHeadersMagic_netHttp1_cwHeaderOffset int32
var _httpResponseWriterHeadersMagic_netHttp2_handlerHeaderOffset int32
var _httpResponseWriterHeadersMagic_netHttp2_snapHeaderOffset int32