allow to expose some method via http.HandlerFunc
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
This commit is contained in:
parent
3fdff4312c
commit
316f644090
281
handler.go
281
handler.go
@ -60,6 +60,279 @@ func (h *httpHandler) Options() server.HandlerOptions {
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return h.opts
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}
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func (h *httpServer) HTTPHandlerFunc(handler interface{}) (http.HandlerFunc, error) {
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if handler == nil {
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return nil, fmt.Errorf("invalid handler specified: %v", handler)
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}
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rtype := reflect.TypeOf(handler)
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if rtype.NumIn() != 3 {
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return nil, fmt.Errorf("invalid handler, NumIn != 3: %v", rtype.NumIn())
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}
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argType := rtype.In(1)
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replyType := rtype.In(2)
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// First arg need not be a pointer.
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if !isExportedOrBuiltinType(argType) {
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return nil, fmt.Errorf("invalid handler, argument type not exported: %v", argType)
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}
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if replyType.Kind() != reflect.Ptr {
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return nil, fmt.Errorf("invalid handler, reply type not a pointer: %v", replyType)
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}
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// Reply type must be exported.
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if !isExportedOrBuiltinType(replyType) {
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return nil, fmt.Errorf("invalid handler, reply type not exported: %v", replyType)
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}
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if rtype.NumOut() != 1 {
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return nil, fmt.Errorf("invalid handler, has wrong number of outs: %v", rtype.NumOut())
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}
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// The return type of the method must be error.
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if returnType := rtype.Out(0); returnType != typeOfError {
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return nil, fmt.Errorf("invalid handler, returns %v not error", returnType.String())
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}
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return func(w http.ResponseWriter, r *http.Request) {
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ct := DefaultContentType
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if htype := r.Header.Get(metadata.HeaderContentType); htype != "" {
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ct = htype
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}
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ctx := context.WithValue(r.Context(), rspCodeKey{}, &rspCodeVal{})
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ctx = context.WithValue(ctx, rspHeaderKey{}, &rspHeaderVal{})
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md, ok := metadata.FromIncomingContext(ctx)
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if !ok {
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md = metadata.New(len(r.Header) + 8)
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}
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for k, v := range r.Header {
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md[k] = strings.Join(v, ", ")
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}
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md["RemoteAddr"] = r.RemoteAddr
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md["Method"] = r.Method
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md["URL"] = r.URL.String()
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md["Proto"] = r.Proto
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md["ContentLength"] = fmt.Sprintf("%d", r.ContentLength)
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md["TransferEncoding"] = strings.Join(r.TransferEncoding, ",")
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md["Host"] = r.Host
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md["RequestURI"] = r.RequestURI
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ctx = metadata.NewIncomingContext(ctx, md)
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path := r.URL.Path
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if r.Body != nil {
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defer r.Body.Close()
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}
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matches := make(map[string]interface{})
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var match bool
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var hldr *patHandler
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var handler *httpHandler
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for _, shdlr := range h.handlers {
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hdlr := shdlr.(*httpHandler)
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fh, mp, err := hdlr.handlers.Search(r.Method, path)
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if err == nil {
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match = true
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for k, v := range mp {
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matches[k] = v
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}
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hldr = fh.(*patHandler)
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handler = hdlr
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break
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} else if err == rhttp.ErrMethodNotAllowed && !h.registerRPC {
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w.WriteHeader(http.StatusMethodNotAllowed)
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_, _ = w.Write([]byte("not matching route found"))
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return
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}
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}
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if !match && h.registerRPC {
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microMethod, mok := md.Get(metadata.HeaderEndpoint)
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if mok {
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serviceMethod := strings.Split(microMethod, ".")
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if len(serviceMethod) == 2 {
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if shdlr, ok := h.handlers[serviceMethod[0]]; ok {
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hdlr := shdlr.(*httpHandler)
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fh, mp, err := hdlr.handlers.Search(http.MethodPost, "/"+microMethod)
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if err == nil {
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match = true
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for k, v := range mp {
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matches[k] = v
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}
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hldr = fh.(*patHandler)
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handler = hdlr
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}
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}
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}
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}
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}
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// get fields from url values
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if len(r.URL.RawQuery) > 0 {
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umd, cerr := rflutil.URLMap(r.URL.RawQuery)
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if cerr != nil {
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w.WriteHeader(http.StatusInternalServerError)
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_, _ = w.Write([]byte(cerr.Error()))
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return
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}
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for k, v := range umd {
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matches[k] = v
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}
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}
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cf, err := h.newCodec(ct)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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_, _ = w.Write([]byte(err.Error()))
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return
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}
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var argv, replyv reflect.Value
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// Decode the argument value.
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argIsValue := false // if true, need to indirect before calling.
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if hldr.mtype.ArgType.Kind() == reflect.Ptr {
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argv = reflect.New(hldr.mtype.ArgType.Elem())
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} else {
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argv = reflect.New(hldr.mtype.ArgType)
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argIsValue = true
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}
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if argIsValue {
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argv = argv.Elem()
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}
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// reply value
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replyv = reflect.New(hldr.mtype.ReplyType.Elem())
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function := hldr.mtype.method.Func
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var returnValues []reflect.Value
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if r.Body != nil {
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var buf []byte
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buf, err = io.ReadAll(r.Body)
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if err != nil && err != io.EOF {
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h.errorHandler(ctx, handler, w, r, err, http.StatusInternalServerError)
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return
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}
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if err = cf.Unmarshal(buf, argv.Interface()); err != nil {
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h.errorHandler(ctx, handler, w, r, err, http.StatusBadRequest)
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return
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}
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}
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matches = rflutil.FlattenMap(matches)
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if err = rflutil.Merge(argv.Interface(), matches, rflutil.SliceAppend(true), rflutil.Tags([]string{"protobuf", "json"})); err != nil {
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h.errorHandler(ctx, handler, w, r, err, http.StatusBadRequest)
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return
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}
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hr := &rpcRequest{
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codec: cf,
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service: handler.sopts.Name,
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contentType: ct,
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method: fmt.Sprintf("%s.%s", hldr.name, hldr.mtype.method.Name),
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endpoint: fmt.Sprintf("%s.%s", hldr.name, hldr.mtype.method.Name),
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payload: argv.Interface(),
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header: md,
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}
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// define the handler func
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fn := func(fctx context.Context, req server.Request, rsp interface{}) (err error) {
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returnValues = function.Call([]reflect.Value{hldr.rcvr, hldr.mtype.prepareContext(fctx), argv, reflect.ValueOf(rsp)})
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// The return value for the method is an error.
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if rerr := returnValues[0].Interface(); rerr != nil {
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err = rerr.(error)
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}
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md, ok := metadata.FromOutgoingContext(ctx)
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if !ok {
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md = metadata.New(0)
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}
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if nmd, ok := metadata.FromOutgoingContext(fctx); ok {
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for k, v := range nmd {
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md.Set(k, v)
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}
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}
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metadata.SetOutgoingContext(ctx, md)
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return err
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}
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// wrap the handler func
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for i := len(handler.sopts.HdlrWrappers); i > 0; i-- {
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fn = handler.sopts.HdlrWrappers[i-1](fn)
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}
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if ct == "application/x-www-form-urlencoded" {
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cf, err = h.newCodec(DefaultContentType)
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if err != nil {
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h.errorHandler(ctx, handler, w, r, err, http.StatusInternalServerError)
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return
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}
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ct = DefaultContentType
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}
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scode := int(200)
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appErr := fn(ctx, hr, replyv.Interface())
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w.Header().Set(metadata.HeaderContentType, ct)
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if md, ok := metadata.FromOutgoingContext(ctx); ok {
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for k, v := range md {
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w.Header().Set(k, v)
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}
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}
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if md := getRspHeader(ctx); md != nil {
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for k, v := range md {
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for _, vv := range v {
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w.Header().Add(k, vv)
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}
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}
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}
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if nct := w.Header().Get(metadata.HeaderContentType); nct != ct {
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if cf, err = h.newCodec(nct); err != nil {
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h.errorHandler(ctx, nil, w, r, err, http.StatusBadRequest)
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return
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}
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}
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var buf []byte
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if appErr != nil {
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switch verr := appErr.(type) {
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case *errors.Error:
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scode = int(verr.Code)
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buf, err = cf.Marshal(verr)
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case *Error:
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buf, err = cf.Marshal(verr.err)
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default:
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buf, err = cf.Marshal(appErr)
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}
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} else {
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buf, err = cf.Marshal(replyv.Interface())
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}
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if err != nil && handler.sopts.Logger.V(logger.ErrorLevel) {
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handler.sopts.Logger.Errorf(handler.sopts.Context, "handler err: %v", err)
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return
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}
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if nscode := GetRspCode(ctx); nscode != 0 {
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scode = nscode
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}
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w.WriteHeader(scode)
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if _, cerr := w.Write(buf); cerr != nil {
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handler.sopts.Logger.Errorf(ctx, "write failed: %v", cerr)
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}
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}, nil
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}
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func (h *httpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// check for http.HandlerFunc handlers
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if ph, _, err := h.pathHandlers.Search(r.Method, r.URL.Path); err == nil {
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@ -91,7 +364,9 @@ func (h *httpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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md["RequestURI"] = r.RequestURI
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ctx = metadata.NewIncomingContext(ctx, md)
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if r.Body != nil {
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defer r.Body.Close()
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}
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path := r.URL.Path
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if !strings.HasPrefix(path, "/") {
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@ -192,7 +467,9 @@ func (h *httpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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function := hldr.mtype.method.Func
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var returnValues []reflect.Value
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buf, err := io.ReadAll(r.Body)
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if r.Body != nil {
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var buf []byte
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buf, err = io.ReadAll(r.Body)
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if err != nil && err != io.EOF {
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h.errorHandler(ctx, handler, w, r, err, http.StatusInternalServerError)
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return
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@ -202,6 +479,7 @@ func (h *httpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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h.errorHandler(ctx, handler, w, r, err, http.StatusBadRequest)
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return
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}
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}
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matches = rflutil.FlattenMap(matches)
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if err = rflutil.Merge(argv.Interface(), matches, rflutil.SliceAppend(true), rflutil.Tags([]string{"protobuf", "json"})); err != nil {
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@ -279,6 +557,7 @@ func (h *httpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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}
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}
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var buf []byte
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if appErr != nil {
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switch verr := appErr.(type) {
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case *errors.Error:
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