I need to create a HTTP Handler for a REST API.
This REST API have many different objects that are stored in a database (MongoDB in my case).
Currently, I need to write one handler per action per object.
I would like to find a way like it's possible with Generics to write a generic handler that could handle a specific action but for any kind of object (As basically it's just CRUD in most of the case)
How can I do this ?
Here is examples of Handlers I would like to transform into a generic one :
func IngredientIndex(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
db := r.Context().Value("Database").(*mgo.Database)
ingredients := []data.Ingredient{}
err := db.C("ingredients").Find(bson.M{}).All(&ingredients)
if err != nil {
panic(err)
}
json.NewEncoder(w).Encode(ingredients)
}
func IngredientGet(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
vars := mux.Vars(r)
logger := r.Context().Value("Logger").(zap.Logger)
db := r.Context().Value("Database").(*mgo.Database)
ingredient := data.Ingredient{}
err := db.C("ingredients").Find(bson.M{"_id": bson.ObjectIdHex(vars["id"])}).One(&ingredient)
if err != nil {
w.WriteHeader(404)
logger.Info("Fail to find entity", zap.Error(err))
} else {
json.NewEncoder(w).Encode(ingredient)
}
}
Basically I would need a handler like this (This is my tentative that doesn't work) :
func ObjectIndex(collection string, container interface{}) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
db := r.Context().Value("Database").(*mgo.Database)
objects := container
err := db.C(collection).Find(bson.M{}).All(&objects)
if err != nil {
panic(err)
}
json.NewEncoder(w).Encode(objects)
}
How can I do that ?