reorganization of _examples and add some new examples such as iris+groupcache+mysql+docker

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/database/mongodb/api/store/movie.go

@@ -0,0 +1,101 @@
+package storeapi
+
+import (
+	"myapp/httputil"
+	"myapp/store"
+
+	"github.com/kataras/iris/v12"
+)
+
+type MovieHandler struct {
+	service store.MovieService
+}
+
+func NewMovieHandler(service store.MovieService) *MovieHandler {
+	return &MovieHandler{service: service}
+}
+
+func (h *MovieHandler) GetAll(ctx iris.Context) {
+	movies, err := h.service.GetAll(nil)
+	if err != nil {
+		httputil.InternalServerErrorJSON(ctx, err, "Server was unable to retrieve all movies")
+		return
+	}
+
+	if movies == nil {
+		// will return "null" if empty, with this "trick" we return "[]" json.
+		movies = make([]store.Movie, 0)
+	}
+
+	ctx.JSON(movies)
+}
+
+func (h *MovieHandler) Get(ctx iris.Context) {
+	id := ctx.Params().Get("id")
+
+	m, err := h.service.GetByID(nil, id)
+	if err != nil {
+		if err == store.ErrNotFound {
+			ctx.NotFound()
+		} else {
+			httputil.InternalServerErrorJSON(ctx, err, "Server was unable to retrieve movie [%s]", id)
+		}
+		return
+	}
+
+	ctx.JSON(m)
+}
+
+func (h *MovieHandler) Add(ctx iris.Context) {
+	m := new(store.Movie)
+
+	err := ctx.ReadJSON(m)
+	if err != nil {
+		httputil.FailJSON(ctx, iris.StatusBadRequest, err, "Malformed request payload")
+		return
+	}
+
+	err = h.service.Create(nil, m)
+	if err != nil {
+		httputil.InternalServerErrorJSON(ctx, err, "Server was unable to create a movie")
+		return
+	}
+
+	ctx.StatusCode(iris.StatusCreated)
+	ctx.JSON(m)
+}
+
+func (h *MovieHandler) Update(ctx iris.Context) {
+	id := ctx.Params().Get("id")
+
+	var m store.Movie
+	err := ctx.ReadJSON(&m)
+	if err != nil {
+		httputil.FailJSON(ctx, iris.StatusBadRequest, err, "Malformed request payload")
+		return
+	}
+
+	err = h.service.Update(nil, id, m)
+	if err != nil {
+		if err == store.ErrNotFound {
+			ctx.NotFound()
+			return
+		}
+		httputil.InternalServerErrorJSON(ctx, err, "Server was unable to update movie [%s]", id)
+		return
+	}
+}
+
+func (h *MovieHandler) Delete(ctx iris.Context) {
+	id := ctx.Params().Get("id")
+
+	err := h.service.Delete(nil, id)
+	if err != nil {
+		if err == store.ErrNotFound {
+			ctx.NotFound()
+			return
+		}
+		httputil.InternalServerErrorJSON(ctx, err, "Server was unable to delete movie [%s]", id)
+		return
+	}
+}