| 41 | } |
| 42 | |
| 43 | func (h *handler) ServeHTTP(w http.ResponseWriter, req *http.Request) { |
| 44 | var a []reflect.Value |
| 45 | if h.hasCtx { |
| 46 | ctx := req.Context() |
| 47 | ctx = context.WithValue(ctx, reqKey, req) |
| 48 | ctx = context.WithValue(ctx, respKey, w) |
| 49 | a = append(a, reflect.ValueOf(ctx)) |
| 50 | } |
| 51 | if h.inType != nil { |
| 52 | inPtr := reflect.New(h.inType) |
| 53 | err := Read(req.Context(), req.Body, inPtr.Interface()) |
| 54 | if err != nil { |
| 55 | h.errFunc(req.Context(), w, err) |
| 56 | return |
| 57 | } |
| 58 | a = append(a, inPtr.Elem()) |
| 59 | } |
| 60 | rv := h.fv.Call(a) |
| 61 | |
| 62 | var ( |
| 63 | res interface{} |
| 64 | err error |
| 65 | ) |
| 66 | switch n := len(rv); { |
| 67 | case n == 0: |
| 68 | res = &DefaultResponse |
| 69 | case n == 1 && !h.fv.Type().Out(0).Implements(errorType): |
| 70 | res = rv[0].Interface() |
| 71 | case n == 1 && h.fv.Type().Out(0).Implements(errorType): |
| 72 | // out param is of type error; its value can still be nil |
| 73 | res = &DefaultResponse |
| 74 | err, _ = rv[0].Interface().(error) |
| 75 | case n == 2: |
| 76 | res = rv[0].Interface() |
| 77 | err, _ = rv[1].Interface().(error) |
| 78 | } |
| 79 | if err != nil { |
| 80 | h.errFunc(req.Context(), w, err) |
| 81 | return |
| 82 | } |
| 83 | |
| 84 | Write(req.Context(), w, 200, res) |
| 85 | } |
| 86 | |
| 87 | var ( |
| 88 | errorType = reflect.TypeOf((*error)(nil)).Elem() |