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go1.22 net/http package new feature support path params pattern
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| package main | |
| import ( | |
| "encoding/json" | |
| "net/http" | |
| "slices" | |
| "sync" | |
| ) | |
| type TODO struct { | |
| UUID string `json:"id"` | |
| Title string `json:"title"` | |
| Description string `json:"description"` | |
| Completed bool `json:"completed"` | |
| } | |
| type TODOList struct { | |
| TODOs []*TODO | |
| mu sync.Mutex | |
| } | |
| func (t *TODOList) Add(todo *TODO) { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| t.TODOs = append(t.TODOs, todo) | |
| } | |
| func (t *TODOList) Remove(uuid string) { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| t.TODOs = slices.DeleteFunc(t.TODOs, func(todo *TODO) bool { | |
| return todo.UUID == uuid | |
| }) | |
| } | |
| func (t *TODOList) Get(uuid string) *TODO { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| i := slices.IndexFunc(t.TODOs, func(todo *TODO) bool { | |
| return todo.UUID == uuid | |
| }) | |
| if i == -1 { | |
| return nil | |
| } | |
| return t.TODOs[i] | |
| } | |
| func (t *TODOList) Update(todo *TODO) { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| i := slices.IndexFunc(t.TODOs, func(t *TODO) bool { | |
| return t.UUID == todo.UUID | |
| }) | |
| if i == -1 { | |
| return | |
| } | |
| t.TODOs[i] = todo | |
| } | |
| func (t *TODOList) All() []*TODO { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| return t.TODOs | |
| } | |
| func (t *TODOList) Completed() []*TODO { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| var completed []*TODO | |
| for _, todo := range t.TODOs { | |
| if todo.Completed { | |
| completed = append(completed, todo) | |
| } | |
| } | |
| return completed | |
| } | |
| func (t *TODOList) Pending() []*TODO { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| var pending []*TODO | |
| for _, todo := range t.TODOs { | |
| if !todo.Completed { | |
| pending = append(pending, todo) | |
| } | |
| } | |
| return pending | |
| } | |
| func (t *TODOList) Clear() { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| t.TODOs = nil | |
| } | |
| func (t *TODOList) Toggle(uuid string) { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| i := slices.IndexFunc(t.TODOs, func(todo *TODO) bool { | |
| return todo.UUID == uuid | |
| }) | |
| if i == -1 { | |
| return | |
| } | |
| t.TODOs[i].Completed = !t.TODOs[i].Completed | |
| } | |
| func (t *TODOList) ToggleAll() { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| for _, todo := range t.TODOs { | |
| todo.Completed = !todo.Completed | |
| } | |
| } | |
| func (t *TODOList) MarkComplete(uuid string) { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| i := slices.IndexFunc(t.TODOs, func(todo *TODO) bool { | |
| return todo.UUID == uuid | |
| }) | |
| if i == -1 { | |
| return | |
| } | |
| t.TODOs[i].Completed = true | |
| } | |
| func (t *TODOList) CompleteAll() { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| for _, todo := range t.TODOs { | |
| todo.Completed = true | |
| } | |
| } | |
| func (t *TODOList) MarkPending(uuid string) { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| i := slices.IndexFunc(t.TODOs, func(todo *TODO) bool { | |
| return todo.UUID == uuid | |
| }) | |
| if i == -1 { | |
| return | |
| } | |
| t.TODOs[i].Completed = false | |
| } | |
| func (t *TODOList) PendingAll() { | |
| t.mu.Lock() | |
| defer t.mu.Unlock() | |
| for _, todo := range t.TODOs { | |
| todo.Completed = false | |
| } | |
| } | |
| func main() { | |
| items := &TODOList{TODOs: []*TODO{}} | |
| http.HandleFunc("/todos", func(w http.ResponseWriter, r *http.Request) { | |
| switch r.Method { | |
| case "GET": | |
| err := json.NewEncoder(w).Encode(items.All()) | |
| if err != nil { | |
| http.Error(w, err.Error(), http.StatusInternalServerError) | |
| return | |
| } | |
| case "POST": | |
| var todo TODO | |
| err := json.NewDecoder(r.Body).Decode(&todo) | |
| if err != nil { | |
| http.Error(w, err.Error(), http.StatusBadRequest) | |
| return | |
| } | |
| items.Add(&todo) | |
| } | |
| }) | |
| http.HandleFunc("/todos/{uuid}", func(w http.ResponseWriter, r *http.Request) { | |
| uuid := r.PathValue("uuid") | |
| switch r.Method { | |
| case "GET": | |
| todo := items.Get(uuid) | |
| if todo == nil { | |
| http.Error(w, "Not Found", http.StatusNotFound) | |
| return | |
| } | |
| err := json.NewEncoder(w).Encode(todo) | |
| if err != nil { | |
| http.Error(w, err.Error(), http.StatusInternalServerError) | |
| return | |
| } | |
| case "PUT": | |
| var todo TODO | |
| err := json.NewDecoder(r.Body).Decode(&todo) | |
| if err != nil { | |
| http.Error(w, err.Error(), http.StatusBadRequest) | |
| return | |
| } | |
| todo.UUID = uuid | |
| items.Update(&todo) | |
| case "DELETE": | |
| items.Remove(uuid) | |
| } | |
| }) | |
| http.HandleFunc("/todos/{uuid}/toggle", func(w http.ResponseWriter, r *http.Request) { | |
| if r.Method != "POST" { | |
| http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed) | |
| return | |
| } | |
| uuid := r.PathValue("uuid") | |
| items.Toggle(uuid) | |
| }) | |
| http.ListenAndServe(":8080", nil) | |
| } |
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