/
request_handlers.go
186 lines (163 loc) · 4.5 KB
/
request_handlers.go
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package httpserver
import (
"github.com/ant0ine/go-json-rest/rest"
"net/http"
)
type TypedRequestHandler[T any] interface {
Path(path string) TypedRequestHandler[T]
Method(method string) TypedRequestHandler[T]
Middleware(middleware Middleware) TypedRequestHandler[T]
Handler(handler func(request *RequestData, body T) (rs Response))
}
type RequestHandler interface {
Path(path string) RequestHandler
Method(method string) RequestHandler
Middleware(middleware Middleware) RequestHandler
Handler(handler func(request *RequestData) (rs Response))
HandlerRaw(handler func(request *RequestData, responseWriter rest.ResponseWriter) error)
}
type rqHandlerBase struct {
server RestServer
path string
method string
middleware Middleware
}
type typedRqHandler[T any] struct {
rqHandlerBase
}
func (r *typedRqHandler[T]) Path(path string) TypedRequestHandler[T] {
r.path = path
return r
}
func (r *typedRqHandler[T]) Method(method string) TypedRequestHandler[T] {
r.method = method
return r
}
func (r *typedRqHandler[T]) Middleware(middleware Middleware) TypedRequestHandler[T] {
r.middleware = middleware
return r
}
func (r *typedRqHandler[T]) Handler(handler func(request *RequestData, body T) Response) {
logger := r.server.logger()
routeFunc := defineRouteFunc(r.method)
if routeFunc == nil {
logger.Fatal("unsupported http method:", r.method)
}
handlerFunc := func(w rest.ResponseWriter, r *rest.Request) {
var rq T
err := r.DecodeJsonPayload(&rq)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
err = w.WriteJson(err.Error())
if err != nil {
logger.Error("on writing response:", err.Error())
return
}
return
}
resp := handler((*RequestData)(r), rq)
if resp.err != nil {
logger.Error("on handling request:", resp.err.Error())
w.WriteHeader(http.StatusInternalServerError)
return
}
w.WriteHeader(resp.httpStatus)
if resp.content != nil {
err = w.WriteJson(&resp.content)
if err != nil {
logger.Error("on writing response:", err.Error())
return
}
}
}
if r.middleware != nil {
innerHandlerFunc := handlerFunc
handlerFunc = func(w rest.ResponseWriter, rq *rest.Request) {
if err := r.middleware(innerHandlerFunc, w, rq); err != nil {
logger.Error("on middleware:", err)
w.WriteHeader(http.StatusInternalServerError)
}
}
}
r.server.registerRoute(routeFunc(r.path, handlerFunc))
}
type rqHandler struct {
rqHandlerBase
}
func (r *rqHandler) Path(path string) RequestHandler {
r.path = path
return r
}
func (r *rqHandler) Method(method string) RequestHandler {
r.method = method
return r
}
func (r *rqHandler) Middleware(middleware Middleware) RequestHandler {
r.middleware = middleware
return r
}
func (r *rqHandler) Handler(handler func(request *RequestData) Response) {
logger := r.server.logger()
r.HandlerRaw(func(request *RequestData, w rest.ResponseWriter) error {
resp := handler(request)
if resp.err != nil {
logger.Error("on handling request:", resp.err.Error())
w.WriteHeader(http.StatusInternalServerError)
return nil
}
w.WriteHeader(resp.httpStatus)
if resp.content != nil {
err := w.WriteJson(&resp.content)
if err != nil {
logger.Error("on writing response:", err.Error())
return nil
}
}
return nil
})
}
func (r *rqHandler) HandlerRaw(handler func(request *RequestData, responseWriter rest.ResponseWriter) error) {
logger := r.server.logger()
routeFunc := defineRouteFunc(r.method)
if routeFunc == nil {
logger.Fatal("unsupported http method:", r.method)
}
handlerFunc := func(w rest.ResponseWriter, r *rest.Request) {
err := handler((*RequestData)(r), w)
if err != nil {
logger.Error("on handling request:", err.Error())
w.WriteHeader(http.StatusInternalServerError)
return
}
}
if r.middleware != nil {
innerHandlerFunc := handlerFunc
handlerFunc = func(w rest.ResponseWriter, rq *rest.Request) {
if err := r.middleware(innerHandlerFunc, w, rq); err != nil {
logger.Error("on middleware:", err)
w.WriteHeader(http.StatusInternalServerError)
}
}
}
r.server.registerRoute(routeFunc(r.path, handlerFunc))
}
func defineRouteFunc(method string) func(path string, handler rest.HandlerFunc) *rest.Route {
switch method {
case http.MethodGet:
return rest.Get
case http.MethodHead:
return rest.Head
case http.MethodPost:
return rest.Post
case http.MethodPut:
return rest.Put
case http.MethodPatch:
return rest.Patch
case http.MethodDelete:
return rest.Delete
case http.MethodOptions:
return rest.Options
default:
return nil
}
}