Query DinD instances for running containers and list the published ports

so the user can reverse proxy to the instance/port easily.

services/broadcast_info_task.go

@@ -4,5 +4,5 @@ type broadcastInfoTask struct {
 }
 
 func (c *broadcastInfoTask) Run(i *Instance) {
-	wsServer.BroadcastTo(i.session.Id, "instance stats", i.Name, i.Mem, i.Cpu, i.IsManager)
+	wsServer.BroadcastTo(i.session.Id, "instance stats", i.Name, i.Mem, i.Cpu, i.IsManager, i.Ports)
 }

services/check_used_ports_task.go

@@ -0,0 +1,10 @@
+package services
+
+type checkUsedPortsTask struct {
+}
+
+func (c checkUsedPortsTask) Run(i *Instance) {
+	if ports, err := GetUsedPorts(i); err == nil {
+		i.Ports = ports
+	}
+}

services/docker.go

@@ -46,6 +46,28 @@ func GetDaemonInfo(i *Instance) (types.Info, error) {
 	}
 	return i.dockerClient.Info(context.Background())
 }
+func GetUsedPorts(i *Instance) ([]uint16, error) {
+	if i.dockerClient == nil {
+		return nil, fmt.Errorf("Docker client for DinD (%s) is not ready", i.IP)
+	}
+	opts := types.ContainerListOptions{}
+	containers, err := i.dockerClient.ContainerList(context.Background(), opts)
+	if err != nil {
+		return nil, err
+	}
+
+	openPorts := []uint16{}
+	for _, c := range containers {
+		for _, p := range c.Ports {
+			// When port is not published on the host docker return public port as 0, so we need to avoid it
+			if p.PublicPort != 0 {
+				openPorts = append(openPorts, p.PublicPort)
+			}
+		}
+	}
+
+	return openPorts, nil
+}
 
 func CreateNetwork(name string) error {
 	opts := types.NetworkCreate{Driver: "overlay", Attachable: true}

services/instance.go

@@ -27,6 +27,7 @@ type Instance struct {
 	IsManager    *bool                   `json:"is_manager"`
 	Mem          string                  `json:"mem"`
 	Cpu          string                  `json:"cpu"`
+	Ports        []uint16                `json:"ports"`
 }
 
 func (i *Instance) IsConnected() bool {

services/task.go

@@ -7,5 +7,5 @@ type periodicTask interface {
 var periodicTasks []periodicTask
 
 func init() {
-	periodicTasks = append(periodicTasks, &collectStatsTask{}, &checkSwarmStatusTask{}, &broadcastInfoTask{})
+	periodicTasks = append(periodicTasks, &collectStatsTask{}, &checkSwarmStatusTask{}, &checkUsedPortsTask{}, &broadcastInfoTask{})
 }

www/assets/app.js

@@ -141,10 +141,11 @@
                     $scope.connected = true;
                 });
 
-                socket.on('instance stats', function(name, mem, cpu, isManager) {
+                socket.on('instance stats', function(name, mem, cpu, isManager, ports) {
                     $scope.idx[name].mem = mem;
                     $scope.idx[name].cpu = cpu;
                     $scope.idx[name].isManager = isManager;
+                    $scope.idx[name].ports = ports;
                     $scope.$apply();
                 });
 
@@ -167,6 +168,12 @@
 			});
 		}
 
+        $scope.getProxyUrl = function(instance, port) {
+            var url = window.location.protocol + '//ip' + instance.ip.replace(/\./g, '_') + '-' + port + '.' + window.location.host;
+
+            return url;
+        }
+
         $scope.showInstance = function(instance) {
             $scope.selectedInstance = instance;
             if (!instance.creatingTerminal) {

www/index.html

@@ -64,10 +64,17 @@
                       <md-card-title>
                           <md-card-title-text>
                               <span class="md-headline">{{instance.name}}</span>
+                               <div layout-gt-sm="row">
                                   <md-input-container class="md-icon-float md-block">
                                     <label>IP</label>
                                     <input ng-model="instance.ip" type="text" readonly="readonly">
                                   </md-input-container>
+                                  <md-chips ng-model="instance.ports" name="port" readonly="true" md-removable="false">
+                                    <md-chip-template>
+                                    <strong><a href="{{getProxyUrl(instance, $chip)}}" title="{{getProxyUrl(instance, $chip)}}" target="_blank">{{$chip}}</a></strong>
+                                    </md-chip-template>
+                                  </md-chips>
+                               </div>
                                <div layout-gt-sm="row">
                                   <md-input-container class="md-block" flex-gt-sm>
                                     <label>Memory</label>