Initial

4 files changed, 81 insertions, 0 deletions

diff --git a/_examples/wrap/main.go b/_examples/wrap/main.go
new file mode 100644
index 0000000..42e959e
--- /dev/null
+++ b/_examples/wrap/main.go
@@ -0,0 +1,35 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/gogeneric/web"
+)
+
+func main() {
+	h := &http.Server{Addr: "0.0.0.0:3000"}
+	mux := http.NewServeMux()
+	h.Handler = mux
+
+	// Here is magic!
+	mux.HandleFunc("/hello", api.Wrap(handleHello))
+
+	if err := h.ListenAndServe(); err != http.ErrServerClosed {
+		log.Fatalln(err)
+	}
+}
+
+func handleHello(ctx context.Context, req *helloRequest) (*helloResponse, error) {
+	return &helloResponse{Message: fmt.Sprintf("Hello, %s!", req.Name)}, nil
+}
+
+type helloRequest struct {
+	Name string `json:"name"`
+}
+
+type helloResponse struct {
+	Message string `json:"message"`
+}
diff --git a/_examples/wrap/test.http b/_examples/wrap/test.http
new file mode 100644
index 0000000..fd8230c
--- /dev/null
+++ b/_examples/wrap/test.http
@@ -0,0 +1,12 @@
+### Request:
+http://localhost:3000/hello
+Content-Type: application/json
+
+{
+  "name": "Alex"
+}
+
+### Response:
+# http://localhost:3000/hello
+#
+#{"message":"Hello, Alex!"}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..22545d3
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/gogeneric/web
+
+go 1.18
diff --git a/handler.go b/handler.go
new file mode 100644
index 0000000..d497b24
--- /dev/null
+++ b/handler.go
@@ -0,0 +1,31 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+//Wrap API handler and returns standard http handler function
+func Wrap[RQ any, RS any](handler func(ctx context.Context, request *RQ) (RS, error)) func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		req := new(RQ)
+		if err := json.NewDecoder(r.Body).Decode(req); err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			_, _ = w.Write([]byte(fmt.Sprintf("Fail to parse request body: %s", err.Error())))
+			return
+		}
+		resp, err := handler(r.Context(), req)
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			_, _ = w.Write([]byte(err.Error()))
+			return
+		}
+		if err := json.NewEncoder(w).Encode(resp); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			_, _ = w.Write([]byte(err.Error()))
+			return
+		}
+	}
+}