9 "github.com/gin-gonic/gin"
10 "github.com/jinzhu/gorm"
12 "github.com/vapor/errors"
13 "github.com/vapor/toolbar/federation/config"
22 func NewServer(db *gorm.DB, cfg *config.Config) *Server {
27 if cfg.API.IsReleaseMode {
28 gin.SetMode(gin.ReleaseMode)
34 func (server *Server) setupRouter() {
36 r.Use(server.middleware())
38 v1 := r.Group("/api/v1")
39 v1.POST("/federation/list-crosschain-txs", handlerMiddleware(server.ListCrosschainTxs))
44 func (s *Server) Run() {
48 func (s *Server) middleware() gin.HandlerFunc {
49 return func(c *gin.Context) {
50 // add Access-Control-Allow-Origin
51 c.Header("Access-Control-Allow-Origin", "*")
52 c.Header("Access-Control-Allow-Headers", "Content-Type")
53 c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
54 if c.Request.Method == "OPTIONS" {
55 c.AbortWithStatus(http.StatusOK)
64 type handlerFun interface{}
66 func handlerMiddleware(handleFunc interface{}) func(*gin.Context) {
67 if err := validateFuncType(handleFunc); err != nil {
71 return func(context *gin.Context) {
72 handleRequest(context, handleFunc)
76 func validateFuncType(fun handlerFun) error {
77 ft := reflect.TypeOf(fun)
78 if ft.Kind() != reflect.Func || ft.IsVariadic() {
79 return errors.New("need nonvariadic func in " + ft.String())
82 if ft.NumIn() < 1 || ft.NumIn() > 3 {
83 return errors.New("need one or two or three parameters in " + ft.String())
86 if ft.In(0) != contextType {
87 return errors.New("the first parameter must point of context in " + ft.String())
90 if ft.NumIn() == 2 && ft.In(1).Kind() != reflect.Ptr {
91 return errors.New("the second parameter must point in " + ft.String())
94 if ft.NumIn() == 3 && ft.In(2) != paginationQueryType {
95 return errors.New("the third parameter of pagination must point of paginationQuery in " + ft.String())
98 if ft.NumOut() < 1 || ft.NumOut() > 2 {
99 return errors.New("the size of return value must one or two in " + ft.String())
102 // if has pagination, the first return value must slice or array
103 if ft.NumIn() == 3 && ft.Out(0).Kind() != reflect.Slice && ft.Out(0).Kind() != reflect.Array {
104 return errors.New("the first return value of pagination must slice of array in " + ft.String())
107 if !ft.Out(ft.NumOut() - 1).Implements(errorType) {
108 return errors.New("the last return value must error in " + ft.String())
113 // handleRequest get a handler function to process the request by request url
114 func handleRequest(context *gin.Context, fun handlerFun) {
115 args, err := buildHandleFuncArgs(fun, context)
117 respondErrorResp(context, err)
121 result := callHandleFunc(fun, args...)
122 if err := result[len(result)-1]; err != nil {
123 respondErrorResp(context, err.(error))
127 if exist := processPaginationIfPresent(fun, args, result, context); exist {
131 if len(result) == 1 {
132 respondSuccessResp(context, nil)
136 respondSuccessResp(context, result[0])
139 func buildHandleFuncArgs(fun handlerFun, context *gin.Context) ([]interface{}, error) {
140 args := []interface{}{context}
142 req, err := createHandleReqArg(fun, context)
144 return nil, errors.Wrap(err, "createHandleReqArg")
147 if err := checkDisplayOrder(req); err != nil {
152 args = append(args, req)
155 ft := reflect.TypeOf(fun)
157 // no pagination exists
162 query, err := parsePagination(context)
164 return nil, errors.Wrap(err, "ParsePagination")
167 args = append(args, query)
171 func createHandleReqArg(fun handlerFun, context *gin.Context) (interface{}, error) {
172 ft := reflect.TypeOf(fun)
176 argType := ft.In(1).Elem()
178 reqArg := reflect.New(argType).Interface()
179 if err := context.ShouldBindJSON(reqArg); err != nil {
180 return nil, errors.Wrap(err, "bind reqArg")
183 b, err := json.Marshal(reqArg)
185 return nil, errors.Wrap(err, "json marshal")
188 context.Set(reqBodyLabel, string(b))
193 func checkDisplayOrder(req interface{}) error {
198 reqType := reflect.TypeOf(req).Elem()
199 reqVal := reflect.ValueOf(req).Elem()
201 for i := 0; i < reqType.NumField(); i++ {
202 field := reqType.Field(i)
203 if field.Type != reflect.TypeOf(Display{}) {
206 display := reqVal.Field(i).Interface().(Display)
208 order := strings.Trim(display.Sorter.Order, "")
209 if order != "desc" && order != "asc" {
210 reqVal.Field(i).Set(reflect.ValueOf(Display{Filter: display.Filter, Sorter: Sorter{By: display.Sorter.By, Order: "desc"}}))
216 func callHandleFunc(fun handlerFun, args ...interface{}) []interface{} {
217 fv := reflect.ValueOf(fun)
219 params := make([]reflect.Value, len(args))
220 for i, arg := range args {
221 params[i] = reflect.ValueOf(arg)
224 rs := fv.Call(params)
225 result := make([]interface{}, len(rs))
226 for i, r := range rs {
227 result[i] = r.Interface()