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package httpserver |
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import ( |
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"bytes" |
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"encoding/json" |
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"github.com/arazmj/gerdu/cache" |
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"github.com/arazmj/gerdu/raftproxy" |
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"github.com/gorilla/mux" |
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"github.com/prometheus/client_golang/prometheus/promhttp" |
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log "github.com/sirupsen/logrus" |
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"net/http" |
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) |
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func newRouter(gerdu cache.UnImplementedCache) (router *mux.Router) { |
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router = mux.NewRouter() |
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router.HandleFunc("/cache/{key}", func(w http.ResponseWriter, r *http.Request) { |
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getHandler(w, r, gerdu) |
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}).Methods(http.MethodGet) |
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router.HandleFunc("/cache/{key}", func(w http.ResponseWriter, r *http.Request) { |
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putHandler(w, r, gerdu) |
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}).Methods(http.MethodPut) |
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router.HandleFunc("/cache/{key}", func(w http.ResponseWriter, r *http.Request) { |
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deleteHandler(w, r, gerdu) |
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}).Methods(http.MethodDelete) |
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router.HandleFunc("/join", func(w http.ResponseWriter, r *http.Request) { |
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joinHandler(w, r, gerdu) |
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}).Methods(http.MethodPost) |
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router.HandleFunc("/leave", func(w http.ResponseWriter, r *http.Request) { |
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leaveHandler(w, r, gerdu) |
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}).Methods(http.MethodPost) |
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router.Handle("/metrics", promhttp.Handler()) |
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return router |
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} |
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//HTTPServe start http server in plain text |
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func HTTPServe(host string, gerdu cache.UnImplementedCache) { |
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router := newRouter(gerdu) |
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log.Infof("Gerdu started listening HTTP at %s\n", host) |
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log.Fatal(http.ListenAndServe(host, router)) |
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} |
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//HTTPServeTLS start HTTP server in secure mode |
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func HTTPServeTLS(host string, tlsCert, tlsKey string, gerdu cache.UnImplementedCache) { |
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router := newRouter(gerdu) |
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log.Printf("Gerdu started listening HTTPS TLS at %s\n", host) |
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log.Fatal(http.ListenAndServeTLS(host, tlsCert, tlsKey, router)) |
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} |
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func putHandler(w http.ResponseWriter, r *http.Request, gerdu cache.UnImplementedCache) { |
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vars := mux.Vars(r) |
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key := vars["key"] |
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buf := new(bytes.Buffer) |
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_, err := buf.ReadFrom(r.Body) |
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if err != nil { |
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log.Fatal(err.Error()) |
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return |
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} |
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value := buf.String() |
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created := gerdu.Put(key, value) |
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if !created { |
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log.Printf("HTTP UPDATE Key: %s Value: %s\n", key, value) |
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} else { |
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log.Printf("HTTP INSERT Key: %s Value: %s\n", key, value) |
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} |
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if created { |
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w.WriteHeader(http.StatusCreated) |
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} else { |
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w.WriteHeader(http.StatusNoContent) |
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} |
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} |
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func getHandler(w http.ResponseWriter, r *http.Request, gerdu cache.UnImplementedCache) { |
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vars := mux.Vars(r) |
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key := vars["key"] |
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if value, ok := gerdu.Get(key); ok { |
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log.Printf("HTTP RETREIVED Key: %s Value: %s\n", key, value) |
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w.WriteHeader(http.StatusOK) |
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_, _ = w.Write([]byte(value)) |
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} else { |
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log.Printf("HTTP MISSED Key: %s \n", key) |
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w.WriteHeader(http.StatusNotFound) |
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} |
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} |
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func deleteHandler(w http.ResponseWriter, r *http.Request, gerdu cache.UnImplementedCache) { |
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vars := mux.Vars(r) |
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key := vars["key"] |
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if ok := gerdu.Delete(key); ok { |
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log.Printf("HTTP DELETED Key: %s\n", key) |
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w.WriteHeader(http.StatusOK) |
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} else { |
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log.Printf("HTTP MISSED Key: %s \n", key) |
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w.WriteHeader(http.StatusNotFound) |
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} |
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} |
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func joinHandler(w http.ResponseWriter, r *http.Request, gerdu cache.UnImplementedCache) { |
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raftCache := gerdu.(*raftproxy.RaftProxy) |
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m := map[string]string{} |
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if err := json.NewDecoder(r.Body).Decode(&m); err != nil { |
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w.WriteHeader(http.StatusBadRequest) |
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return |
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} |
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if len(m) != 2 { |
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w.WriteHeader(http.StatusBadRequest) |
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return |
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} |
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remoteAddr, ok := m["addr"] |
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if !ok { |
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w.WriteHeader(http.StatusBadRequest) |
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return |
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} |
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nodeID, ok := m["id"] |
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if !ok { |
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w.WriteHeader(http.StatusBadRequest) |
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return |
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} |
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if err := raftCache.Join(nodeID, remoteAddr); err != nil { |
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w.WriteHeader(http.StatusInternalServerError) |
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return |
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} |
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log.Infof("Node %s, remoteAddr %s joined", nodeID, remoteAddr) |
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} |
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func leaveHandler(w http.ResponseWriter, r *http.Request, gerdu cache.UnImplementedCache) { |
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raftCache := gerdu.(*raftproxy.RaftProxy) |
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buf := new(bytes.Buffer) |
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buf.ReadFrom(r.Body) |
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nodeId := buf.String() |
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if nodeId == "" { |
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w.WriteHeader(http.StatusBadRequest) |
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return |
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} |
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if err := raftCache.Leave(nodeId); err != nil { |
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w.WriteHeader(http.StatusInternalServerError) |
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return |
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} |
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log.Infof("Node %s has left", nodeId) |
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147
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} |
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148
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arazmj /
gerdu
