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Example usage of go-router and go-middleware
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| package main | |
| import ( | |
| "encoding/json" | |
| "net/http" | |
| "sort" | |
| "strconv" | |
| "sync" | |
| "github.com/payfazz/go-middleware" | |
| "github.com/payfazz/go-middleware/common" | |
| "github.com/payfazz/go-middleware/common/kv" | |
| "github.com/payfazz/go-router/method" | |
| "github.com/payfazz/go-router/path" | |
| "github.com/payfazz/go-router/segment" | |
| ) | |
| func main() { | |
| handler := middleware.Compile( | |
| common.BasicPack(), | |
| // force clean path | |
| path.WithTrailingSlash, | |
| path.H{ | |
| "/phonebooks": method.H{ | |
| "GET": getAllHandler(), | |
| "POST": postHandler(), | |
| }.C(), | |
| "/phonebooks/:id": middleware.Compile( | |
| // don't forget to use segment.MustEnd | |
| // because we only want to handle last part of segment | |
| // so request like phonebooks/10/a/b/c/d will not go here | |
| segment.MustEnd, | |
| method.H{ | |
| "GET": getByIDHandler(), | |
| "PUT": putHandler(), | |
| "DELETE": deleteByIDHandler(), | |
| }.C(), | |
| ), | |
| }.C(), | |
| ) | |
| if err := http.ListenAndServe(":8080", handler); err != nil { | |
| panic(err) | |
| } | |
| } | |
| // handlers | |
| func getAllHandler() http.HandlerFunc { | |
| return func(w http.ResponseWriter, r *http.Request) { | |
| storage.mu.RLock() | |
| defer storage.mu.RUnlock() | |
| ret := make([]*Data, 0) | |
| for _, v := range storage.data { | |
| ret = append(ret, v) | |
| } | |
| sort.Slice(ret, func(i, j int) bool { | |
| return ret[i].ID < ret[j].ID | |
| }) | |
| writeJSON(w, http.StatusOK, ret) | |
| } | |
| } | |
| func getByIDHandler() http.HandlerFunc { | |
| return func(w http.ResponseWriter, r *http.Request) { | |
| ret := func() *Data { | |
| storage.mu.RLock() | |
| defer storage.mu.RUnlock() | |
| idStr := segment.Param(r, "id") | |
| id, err := strconv.Atoi(idStr) | |
| if err != nil { | |
| return nil | |
| } | |
| return storage.data[id] | |
| }() | |
| if ret == nil { | |
| w.WriteHeader(http.StatusNotFound) | |
| return | |
| } | |
| writeJSON(w, http.StatusOK, ret) | |
| } | |
| } | |
| func postHandler() http.HandlerFunc { | |
| return middleware.Compile( | |
| authMiddleware(), | |
| dataParserMiddleware(), | |
| func(w http.ResponseWriter, r *http.Request) { | |
| id := func() int { | |
| storage.mu.RLock() | |
| defer storage.mu.RUnlock() | |
| for { | |
| id := nextID | |
| nextID++ | |
| if _, found := storage.data[id]; id != 0 && !found { | |
| return id | |
| } | |
| } | |
| }() | |
| storage.mu.Lock() | |
| defer storage.mu.Unlock() | |
| data := kv.MustGet(r, "data").(*Data) | |
| data.ID = id | |
| storage.data[id] = data | |
| writeJSON(w, http.StatusCreated, data) | |
| }, | |
| ) | |
| } | |
| func putHandler() http.HandlerFunc { | |
| return middleware.Compile( | |
| authMiddleware(), | |
| dataParserMiddleware(), | |
| func(w http.ResponseWriter, r *http.Request) { | |
| id := func() int { | |
| idStr := segment.Param(r, "id") | |
| id, _ := strconv.Atoi(idStr) | |
| return id | |
| }() | |
| if id == 0 { | |
| w.WriteHeader(http.StatusBadRequest) | |
| return | |
| } | |
| storage.mu.Lock() | |
| defer storage.mu.Unlock() | |
| data := kv.MustGet(r, "data").(*Data) | |
| data.ID = id | |
| storage.data[id] = data | |
| writeJSON(w, http.StatusCreated, data) | |
| }, | |
| ) | |
| } | |
| func deleteByIDHandler() http.HandlerFunc { | |
| return middleware.Compile( | |
| authMiddleware(), | |
| func(w http.ResponseWriter, r *http.Request) { | |
| id := func() int { | |
| idStr := segment.Param(r, "id") | |
| id, _ := strconv.Atoi(idStr) | |
| return id | |
| }() | |
| if id == 0 { | |
| w.WriteHeader(http.StatusBadRequest) | |
| return | |
| } | |
| storage.mu.Lock() | |
| defer storage.mu.Unlock() | |
| if _, found := storage.data[id]; !found { | |
| w.WriteHeader(http.StatusNotFound) | |
| return | |
| } | |
| delete(storage.data, id) | |
| w.WriteHeader(http.StatusNoContent) | |
| }, | |
| ) | |
| } | |
| // middlewares | |
| // simple authMiddleware that only accept | |
| // user "admin" with password "passwd" | |
| func authMiddleware() func(http.HandlerFunc) http.HandlerFunc { | |
| return func(next http.HandlerFunc) http.HandlerFunc { | |
| return func(w http.ResponseWriter, r *http.Request) { | |
| user, pass, _ := r.BasicAuth() | |
| if user == "admin" && pass == "passwd" { | |
| next(w, r) | |
| } else { | |
| w.WriteHeader(http.StatusUnauthorized) | |
| w.Header().Set("WWW-Authenticate", "Basic realm=\"Authorization Required\"") | |
| } | |
| } | |
| } | |
| } | |
| func dataParserMiddleware() func(http.HandlerFunc) http.HandlerFunc { | |
| return func(next http.HandlerFunc) http.HandlerFunc { | |
| return func(w http.ResponseWriter, r *http.Request) { | |
| data := func() *Data { | |
| var data *Data | |
| err := json.NewDecoder(r.Body).Decode(&data) | |
| if err != nil { | |
| return nil | |
| } | |
| return data | |
| }() | |
| if data == nil { | |
| w.WriteHeader(http.StatusUnprocessableEntity) | |
| } else { | |
| kv.Set(r, "data", data) | |
| next(w, r) | |
| } | |
| } | |
| } | |
| } | |
| // data | |
| type Data struct { | |
| ID int | |
| Name string | |
| PhoneNumber string | |
| } | |
| var ( | |
| nextID = 1 | |
| storage = struct { | |
| mu sync.RWMutex | |
| data map[int]*Data | |
| }{ | |
| data: map[int]*Data{ | |
| 1: &Data{ | |
| ID: 1, | |
| Name: "Alice", | |
| PhoneNumber: "000-001", | |
| }, | |
| 2: &Data{ | |
| ID: 2, | |
| Name: "Bob", | |
| PhoneNumber: "000-002", | |
| }, | |
| 3: &Data{ | |
| ID: 3, | |
| Name: "Charlie", | |
| PhoneNumber: "000-003", | |
| }, | |
| }, | |
| } | |
| ) | |
| // helper | |
| func writeJSON(w http.ResponseWriter, status int, data interface{}) { | |
| w.Header().Set("Content-Type", "application/json") | |
| w.WriteHeader(status) | |
| encoder := json.NewEncoder(w) | |
| encoder.SetIndent("", " ") | |
| encoder.Encode(data) | |
| } |
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NOTE, I don't handler race condition on storage map, in production, you should use mutex when there are multiple goroutine writer/reader to
mapEDIT:
I already update it