implement the dynamic handler : fill input struct, do the call, fill return struct
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a5424d8941
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@ -4,6 +4,7 @@ import (
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"fmt"
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"reflect"
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"git.xdrm.io/go/aicra/api"
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"git.xdrm.io/go/aicra/internal/config"
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)
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@ -38,7 +39,52 @@ func Build(fn HandlerFn, service config.Service) (*Handler, error) {
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return h, nil
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}
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// Handle
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func (h *Handler) Handle() {
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// Handle binds input @data into HandleFn and returns map output
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func (h *Handler) Handle(data map[string]interface{}) (map[string]interface{}, api.Error) {
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fnv := reflect.ValueOf(h.fn)
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callArgs := []reflect.Value{}
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// bind input data
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if fnv.Type().NumIn() > 0 {
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// create zero value struct
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callStructPtr := reflect.New(fnv.Type().In(0))
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callStruct := callStructPtr.Elem()
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// set each field
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for name := range h.spec.Input {
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field := callStruct.FieldByName(name)
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if !field.CanSet() {
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continue
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}
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// get value from @data
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value, inData := data[name]
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if !inData {
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continue
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}
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field.Set(reflect.ValueOf(value).Convert(field.Type()))
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}
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callArgs = append(callArgs, callStruct)
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}
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// call the HandlerFn
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output := fnv.Call(callArgs)
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// no output OR pointer to output struct is nil
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outdata := make(map[string]interface{})
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if len(h.spec.Output) < 1 || output[0].IsNil() {
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return outdata, api.Error(output[len(output)-1].Int())
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}
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// extract struct from pointer
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returnStruct := output[0].Elem()
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for name := range h.spec.Output {
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field := returnStruct.FieldByName(name)
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outdata[name] = field.Interface()
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}
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// extract api.Error
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return outdata, api.Error(output[len(output)-1].Int())
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}
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13
http.go
13
http.go
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@ -55,11 +55,11 @@ func (server httpServer) ServeHTTP(res http.ResponseWriter, req *http.Request) {
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}
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// 6. find a matching handler
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var foundHandler *api.Handler
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var foundHandler *handler
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var found bool
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for _, handler := range server.handlers {
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if handler.GetMethod() == service.Method && handler.GetPath() == service.Pattern {
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if handler.Method == service.Method && handler.Path == service.Pattern {
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foundHandler = handler
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found = true
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}
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@ -91,9 +91,12 @@ func (server httpServer) ServeHTTP(res http.ResponseWriter, req *http.Request) {
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apireq.Param = dataset.Data
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// 10. execute
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response := api.EmptyResponse()
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apiErr := foundHandler.Fn(*apireq, response)
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response.WithError(apiErr)
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returned, apiErr := foundHandler.dynHandler.Handle(dataset.Data)
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response := api.EmptyResponse().WithError(apiErr)
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for key, value := range returned {
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response.SetData(name, value)
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}
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// 11. apply headers
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res.Header().Set("Content-Type", "application/json; charset=utf-8")
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