Rework complete project

api/v1/server.go

@@ -0,0 +1,120 @@
+package api_v1
+
+import (
+	"context"
+	"net/http"
+
+	"git.ar21.de/tom/country-geo-locations/pkg/geoloc"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/render"
+)
+
+func ApiRouter() chi.Router {
+	r := chi.NewRouter()
+
+	r.Use(render.SetContentType(render.ContentTypeJSON))
+
+	r.Get("/ping", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("pong"))
+	})
+
+	r.Route("/location", func(r chi.Router) {
+		r.Route("/{ipAddress}", func(r chi.Router) {
+			r.Use(searchIPCtx)
+			r.Get("/", searchIP)
+		})
+	})
+
+	return r
+}
+
+func searchIP(w http.ResponseWriter, r *http.Request) {
+	ipinfo := r.Context().Value(keyIPInfo).(*geoloc.IPInfo)
+
+	if err := render.Render(w, r, newIPInfoResponse(ipinfo)); err != nil {
+		render.Render(w, r, errRender(err))
+		return
+	}
+}
+
+func searchIPCtx(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var ipinfo *geoloc.IPInfo
+		var ipnetnum uint
+		var err error
+
+		if ipAddress := chi.URLParam(r, "ipAddress"); ipAddress != "" {
+			ipnetnum, err = geoloc.GetIPInfo(ipAddress)
+			if err != nil {
+				render.Render(w, r, errInvalidRequest(err))
+				return
+			}
+			for {
+				ipinfo, err = geoloc.SearchIPNet(ipnetnum)
+				if err != nil {
+					render.Render(w, r, errNotFound)
+					return
+				}
+				if ipinfo != nil {
+					break
+				}
+				ipnetnum = ipnetnum - 8
+			}
+		}
+		ctx := context.WithValue(r.Context(), keyIPInfo, ipinfo)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+type errResponse struct {
+	Err            error `json:"-"`
+	HTTPStatusCode int   `json:"-"`
+
+	StatusText string `json:"status"`
+	AppCode    int64  `json:"code,omitempty"`
+	ErrorText  string `json:"error,omitempty"`
+}
+
+func (e *errResponse) Render(w http.ResponseWriter, r *http.Request) error {
+	render.Status(r, e.HTTPStatusCode)
+	return nil
+}
+
+func errInvalidRequest(err error) render.Renderer {
+	return &errResponse{
+		Err:            err,
+		HTTPStatusCode: 400,
+		StatusText:     "Invalid request",
+		ErrorText:      err.Error(),
+	}
+}
+
+func errRender(err error) render.Renderer {
+	return &errResponse{
+		Err:            err,
+		HTTPStatusCode: 422,
+		StatusText:     "Error rendering response",
+		ErrorText:      err.Error(),
+	}
+}
+
+var errNotFound = &errResponse{HTTPStatusCode: 404, StatusText: "Resource not found"}
+
+type key int
+
+const keyIPInfo key = iota
+
+type ipInfoResponse struct {
+	*geoloc.IPInfo
+
+	Elapsed int64 `json:"elapsed"`
+}
+
+func (ir *ipInfoResponse) Render(w http.ResponseWriter, r *http.Request) error {
+	ir.Elapsed = 10
+	return nil
+}
+
+func newIPInfoResponse(ipinfo *geoloc.IPInfo) *ipInfoResponse {
+	return &ipInfoResponse{IPInfo: ipinfo}
+}