save and reuse active connections

core/grpcox.go

@@ -16,7 +16,8 @@ import (
 // GrpCox - main object
 type GrpCox struct {
 	KeepAlive float64
-	PlainText bool
+
+	activeConn map[string]*Resource
 
 	// TODO : utilize below args
 	headers        []string
@@ -30,14 +31,28 @@ type GrpCox struct {
 	isUnixSocket   func() bool
 }
 
+// InitGrpCox constructor
+func InitGrpCox() *GrpCox {
+	return &GrpCox{
+		activeConn: make(map[string]*Resource),
+	}
+}
+
 // GetResource - open resource to targeted grpc server
-func (g *GrpCox) GetResource(ctx context.Context, target string) (*Resource, error) {
+func (g *GrpCox) GetResource(ctx context.Context, target string, plainText, isRestartConn bool) (*Resource, error) {
+	if conn, ok := g.activeConn[target]; ok {
+		if !isRestartConn && conn.refClient != nil && conn.clientConn != nil {
+			return conn, nil
+		}
+		g.CloseActiveConns(target)
+	}
+
 	var err error
 	r := new(Resource)
 	h := append(g.headers, g.reflectHeaders...)
 	md := grpcurl.MetadataFromHeaders(h)
 	refCtx := metadata.NewOutgoingContext(ctx, md)
-	r.clientConn, err = g.dial(ctx, target)
+	r.clientConn, err = g.dial(ctx, target, plainText)
 	if err != nil {
 		return nil, err
 	}
@@ -46,10 +61,40 @@ func (g *GrpCox) GetResource(ctx context.Context, target string) (*Resource, err
 	r.descSource = grpcurl.DescriptorSourceFromServer(ctx, r.refClient)
 	r.headers = h
 
+	g.activeConn[target] = r
 	return r, nil
 }
 
-func (g *GrpCox) dial(ctx context.Context, target string) (*grpc.ClientConn, error) {
+// GetActiveConns - get all saved active connection
+func (g *GrpCox) GetActiveConns(ctx context.Context) []string {
+	result := make([]string, len(g.activeConn))
+	i := 0
+	for k := range g.activeConn {
+		result[i] = k
+		i++
+	}
+	return result
+}
+
+// CloseActiveConns - close conn by host or all
+func (g *GrpCox) CloseActiveConns(host string) error {
+	if host == "all" {
+		for k, v := range g.activeConn {
+			v.Close()
+			delete(g.activeConn, k)
+		}
+		return nil
+	}
+
+	if v, ok := g.activeConn[host]; ok {
+		v.Close()
+		delete(g.activeConn, host)
+	}
+
+	return nil
+}
+
+func (g *GrpCox) dial(ctx context.Context, target string, plainText bool) (*grpc.ClientConn, error) {
 	dialTime := 10 * time.Second
 	ctx, cancel := context.WithTimeout(ctx, dialTime)
 	defer cancel()
@@ -69,7 +114,7 @@ func (g *GrpCox) dial(ctx context.Context, target string) (*grpc.ClientConn, err
 	}
 
 	var creds credentials.TransportCredentials
-	if !g.PlainText {
+	if !plainText {
 		var err error
 		creds, err = grpcurl.ClientTransportCredentials(g.insecure, g.cacert, g.cert, g.key)
 		if err != nil {

core/resource.go

@@ -119,7 +119,7 @@ func (r *Resource) Describe(symbol string) (string, string, error) {
 
 // Invoke - invoking gRPC function
 func (r *Resource) Invoke(ctx context.Context, symbol string, in io.Reader) (string, time.Duration, error) {
-	// because of grpcurl directlu fmt.Printf on their invoke function
+	// because of grpcurl directly fmt.Printf on their invoke function
 	// so we stub the Stdout using os.Pipe
 	backUpStdout := os.Stdout
 	defer func() {

handler/handler.go

@@ -6,12 +6,25 @@ import (
 	"fmt"
 	"net/http"
 	"strconv"
+	"strings"
 
 	"github.com/gorilla/mux"
 	"github.com/gusaul/grpcox/core"
 )
 
-func index(w http.ResponseWriter, r *http.Request) {
+// Handler hold all handler methods
+type Handler struct {
+	g *core.GrpCox
+}
+
+// InitHandler Constructor
+func InitHandler() *Handler {
+	return &Handler{
+		g: core.InitGrpCox(),
+	}
+}
+
+func (h *Handler) index(w http.ResponseWriter, r *http.Request) {
 	body := new(bytes.Buffer)
 	err := indexHTML.Execute(body, make(map[string]string))
 	if err != nil {
@@ -23,7 +36,27 @@ func index(w http.ResponseWriter, r *http.Request) {
 	w.Write(body.Bytes())
 }
 
-func getLists(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) getActiveConns(w http.ResponseWriter, r *http.Request) {
+	response(w, h.g.GetActiveConns(context.TODO()))
+}
+
+func (h *Handler) closeActiveConns(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	host := vars["host"]
+	if host == "" {
+		writeError(w, fmt.Errorf("Invalid Host"))
+		return
+	}
+
+	err := h.g.CloseActiveConns(strings.Trim(host, " "))
+	if err != nil {
+		writeError(w, err)
+		return
+	}
+	response(w, map[string]bool{"success": true})
+}
+
+func (h *Handler) getLists(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
 	host := vars["host"]
 	if host == "" {
@@ -33,16 +66,14 @@ func getLists(w http.ResponseWriter, r *http.Request) {
 
 	service := vars["serv_name"]
 
-	g := new(core.GrpCox)
 	useTLS, _ := strconv.ParseBool(r.Header.Get("use_tls"))
-	g.PlainText = !useTLS
+	restart, _ := strconv.ParseBool(r.FormValue("restart"))
 
-	res, err := g.GetResource(context.Background(), host)
+	res, err := h.g.GetResource(context.Background(), host, !useTLS, restart)
 	if err != nil {
 		writeError(w, err)
 		return
 	}
-	defer res.Close()
 
 	result, err := res.List(service)
 	if err != nil {
@@ -53,7 +84,7 @@ func getLists(w http.ResponseWriter, r *http.Request) {
 	response(w, result)
 }
 
-func describeFunction(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) describeFunction(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
 	host := vars["host"]
 	if host == "" {
@@ -67,16 +98,13 @@ func describeFunction(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	g := new(core.GrpCox)
 	useTLS, _ := strconv.ParseBool(r.Header.Get("use_tls"))
-	g.PlainText = !useTLS
 
-	res, err := g.GetResource(context.Background(), host)
+	res, err := h.g.GetResource(context.Background(), host, !useTLS, false)
 	if err != nil {
 		writeError(w, err)
 		return
 	}
-	defer res.Close()
 
 	// get param
 	result, _, err := res.Describe(funcName)
@@ -109,7 +137,7 @@ func describeFunction(w http.ResponseWriter, r *http.Request) {
 
 }
 
-func invokeFunction(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) invokeFunction(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
 	host := vars["host"]
 	if host == "" {
@@ -123,16 +151,13 @@ func invokeFunction(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	g := new(core.GrpCox)
 	useTLS, _ := strconv.ParseBool(r.Header.Get("use_tls"))
-	g.PlainText = !useTLS
 
-	res, err := g.GetResource(context.Background(), host)
+	res, err := h.g.GetResource(context.Background(), host, !useTLS, false)
 	if err != nil {
 		writeError(w, err)
 		return
 	}
-	defer res.Close()
 
 	// get param
 	result, timer, err := res.Invoke(context.Background(), funcName, r.Body)

handler/routes.go

@@ -8,18 +8,26 @@ import (
 
 // Init - routes initialization
 func Init(router *mux.Router) {
-	router.HandleFunc("/", index)
+	h := InitHandler()
+
+	router.HandleFunc("/", h.index)
 
 	ajaxRoute := router.PathPrefix("/server/{host}").Subrouter()
-	ajaxRoute.HandleFunc("/services", corsHandler(getLists)).Methods(http.MethodGet, http.MethodOptions)
-	ajaxRoute.HandleFunc("/service/{serv_name}/functions", corsHandler(getLists)).Methods(http.MethodGet, http.MethodOptions)
-	ajaxRoute.HandleFunc("/function/{func_name}/describe", corsHandler(describeFunction)).Methods(http.MethodGet, http.MethodOptions)
-	ajaxRoute.HandleFunc("/function/{func_name}/invoke", corsHandler(invokeFunction)).Methods(http.MethodPost, http.MethodOptions)
+	ajaxRoute.HandleFunc("/services", corsHandler(h.getLists)).Methods(http.MethodGet, http.MethodOptions)
+	ajaxRoute.HandleFunc("/service/{serv_name}/functions", corsHandler(h.getLists)).Methods(http.MethodGet, http.MethodOptions)
+	ajaxRoute.HandleFunc("/function/{func_name}/describe", corsHandler(h.describeFunction)).Methods(http.MethodGet, http.MethodOptions)
+	ajaxRoute.HandleFunc("/function/{func_name}/invoke", corsHandler(h.invokeFunction)).Methods(http.MethodPost, http.MethodOptions)
+
+	// get list of active connection
+	router.HandleFunc("/active/get", corsHandler(h.getActiveConns)).Methods(http.MethodGet, http.MethodOptions)
+	// close active connection
+	router.HandleFunc("/active/close/{host}", corsHandler(h.closeActiveConns)).Methods(http.MethodDelete, http.MethodOptions)
 
 	assetsPath := "index"
 	router.PathPrefix("/css/").Handler(http.StripPrefix("/css/", http.FileServer(http.Dir(assetsPath+"/css/"))))
 	router.PathPrefix("/js/").Handler(http.StripPrefix("/js/", http.FileServer(http.Dir(assetsPath+"/js/"))))
 	router.PathPrefix("/font/").Handler(http.StripPrefix("/font/", http.FileServer(http.Dir(assetsPath+"/font/"))))
+	router.PathPrefix("/img/").Handler(http.StripPrefix("/img/", http.FileServer(http.Dir(assetsPath+"/img/"))))
 }
 
 func corsHandler(h http.HandlerFunc) http.HandlerFunc {

index/css/style.css

@@ -53,6 +53,101 @@ body {
     }
 }
 
+/* connections */
+.connections {
+    font-weight: 100;
+    background: #efefef;
+    width: 240px;
+    height: 320px;
+    position: fixed;
+    top: 200px;
+    z-index: 100;
+    -webkit-box-shadow: -3px 0px 5px 0px rgba(0,0,0,0.2);
+    box-shadow: -3px 0px 5px 0px rgba(0,0,0,0.2);
+    left: -190px;
+    transition: all .3s;
+    -webkit-transition: all .3s;
+    color: #222;
+}
+
+.connections:hover, .connections:focus {
+    transform: translate3d(190px, 0, 0);
+    animation-timing-function: 1s ease-in
+}
+
+.connections .title {
+    top: 50%;
+    position: absolute;
+    -webkit-transform: translateY(-50%);
+    -ms-transform: translateY(-50%);
+    transform: translateY(-50%);
+    transform: rotate(270deg);
+    right: -50px;
+    font-weight: 800;
+    font-size: 15px
+}
+
+.connections .nav {
+    position: absolute;
+    -webkit-transform: translateY(-50%);
+    -ms-transform: translateY(-50%);
+    transform: translateY(-50%);
+    font-weight: 100;
+    overflow-y: scroll;
+    padding-left: 10px;
+    padding-right: 30px;
+    top: 160px;
+    height: 300px;
+}
+
+.connections .nav li {
+    padding-bottom: 12px;
+    list-style-type: none
+}
+
+.connections .nav li i {
+    color: #a20000;
+    cursor: pointer;
+}
+
+.connections .nav li a:hover { color: #aaa }
+
+.dots {
+    position: absolute;
+    left: -65px;
+    top: -39px;
+    color: #b70000;
+}
+
+circle {
+    stroke: #ce2828;
+    fill: #a20000;
+    stroke-width: 2px;
+    stroke-opacity: 1;
+}
+
+.pulse {
+    fill: white;
+    fill-opacity: 0;
+    transform-origin: 50% 50%;
+    animation-duration: 2s;
+    animation-name: pulse;
+    animation-iteration-count: infinite;
+}
+
+@keyframes pulse {
+    from {
+        stroke-width: 3px;
+        stroke-opacity: 1;
+        transform: scale(0.3);
+    }
+    to {
+        stroke-width: 0;
+        stroke-opacity: 0;
+        transform: scale(2);
+    }
+}
+
 /* loading spinner */
 .spinner {
     margin: 10px auto;

index/index.html

@@ -5,6 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
   <meta http-equiv="x-ua-compatible" content="ie=edge">
   <title>gRPCox - gRPC Testing Environment</title>
+  <link rel="icon" href="/img/favicon.png" type="image/x-icon" />
   <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
   <link href="css/bootstrap.min.css" rel="stylesheet">
   <link href="css/mdb.min.css" rel="stylesheet">
@@ -23,8 +24,8 @@
           </div>
         </div>
         <div class="custom-control custom-checkbox">
-          <input type="checkbox" class="custom-control-input" id="use-tls">
-          <label class="custom-control-label" for="use-tls">Use TLS</label>
+          <input type="checkbox" class="custom-control-input" id="restart-conn">
+          <label class="custom-control-label" for="restart-conn">Restart Connection</label>
         </div>
 
         <div class="other-elem" id="choose-service" style="display: none">
@@ -92,6 +93,16 @@
     </svg>
   </a>
 
+  <div class="connections">
+      <div class="title">
+              <svg class="dots" expanded = "true" height = "100px" width = "100px"><circle cx = "50%" cy = "50%" r = "7px"></circle><circle class = "pulse" cx = "50%" cy = "50%" r = "10px"></circle></svg>
+              <span></span> Active Connection(s)
+      </div>
+      <div id="conn-list-template" style="display:none"><li><i class="fa fa-close"></i> <span class="ip"></span></li></div>
+      <ul class="nav">
+      </ul>
+  </div>
+
   <div class="spinner" style="display: none">
     <div class="rect1"></div>
     <div class="rect2"></div>

index/js/style.js

@@ -4,15 +4,20 @@ $('#get-services').click(function(){
     var t = get_valid_target();
     if (target != t) {
         target = t;
-        use_tls = $('#use-tls').is(":checked");
+        use_tls = "false";
     } else {
         return false;
     }
+
+    var restart = "0"
+    if($('#restart-conn').is(":checked")) {
+        restart = "1"
+    }
     
     $('.other-elem').hide();
     var button = $(this).html();
     $.ajax({
-        url: "server/"+target+"/services",
+        url: "server/"+target+"/services?restart="+restart,
         global: true,
         method: "GET",
         success: function(res){
@@ -38,6 +43,7 @@ $('#get-services').click(function(){
             show_loading();
         },
         complete: function(){
+            applyConnCount();
             $(this).html(button);
             hide_loading();
         }
@@ -186,4 +192,56 @@ function show_loading() {
 
 function hide_loading() {
     $('.spinner').hide();
-}
+}
+
+$(".connections ul").on("click", "i", function(){
+    $parent = $(this).parent("li");
+    var ip = $(this).siblings("span").text();
+
+    $.ajax({
+        url: "/active/close/" + ip,
+        global: true,
+        method: "DELETE",
+        success: function(res){
+            if(res.data.success) {
+                $parent.remove();
+                updateCountNum();
+            }
+        },
+        error: err,
+        beforeSend: function(xhr){
+            $(this).attr("class", "fa fa-spinner");
+        },
+    });
+});
+
+function updateCountNum() {
+    $(".connections .title span").html($(".connections ul li").length);
+}
+
+function applyConnCount() {
+    $.ajax({
+        url: "active/get",
+        global: true,
+        method: "GET",
+        success: function(res){
+            $(".connections .title span").html(res.data.length);
+            $(".connections .nav").html("");
+            res.data.forEach(function(item){
+                $list = $("#conn-list-template").clone();
+                $list.find(".ip").html(item);
+                $(".connections .nav").append($list.html());
+            });
+        },
+        error: err,
+    });
+}
+
+function refreshConnCount() {
+    applyConnCount();
+    setTimeout(refreshConnCount, 5000);
+}
+
+$(document).ready(function(){
+    refreshConnCount();
+});