Login to Turbo API server before starting the TAP Service (#55)

* OM-37253 Tap service to execute login to get session cookie from the turbo client before adding target

Gopkg.toml

@@ -0,0 +1,54 @@
+# Gopkg.toml example
+#
+# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#   name = "github.com/x/y"
+#   version = "2.4.0"
+#
+# [prune]
+#   non-go = false
+#   go-tests = true
+#   unused-packages = true
+
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/golang/glog"
+
+[[constraint]]
+  name = "github.com/golang/protobuf"
+  version = "1.1.0"
+
+[[constraint]]
+  name = "github.com/gorilla/websocket"
+  version = "1.2.0"
+
+[[constraint]]
+  name = "github.com/stretchr/testify"
+  version = "1.2.2"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/turbonomic/turbo-api"
+
+[[constraint]]
+  branch = "master"
+  name = "golang.org/x/net"
+
+[prune]
+  go-tests = true
+  unused-packages = true

pkg/service/tap_service.go

@@ -70,6 +70,12 @@ func (tapService *TAPService) addTarget(isRegistered chan bool) {
 
 func (tapService *TAPService) ConnectToTurbo() {
 	glog.V(4).Infof("[ConnectToTurbo] Enter ******* ")
+
+	if tapService.RESTClient == nil {
+		glog.V(1).Infof("TAP service cannot be started - cannot create target")
+		return
+	}
+
 	tapService.disconnectFromTurbo = make(chan struct{})
 	isRegistered := make(chan bool, 1)
 	defer close(isRegistered)
@@ -145,6 +151,14 @@ func (builder *TAPServiceBuilder) WithTurboCommunicator(commConfig *TurboCommuni
 		return builder
 	}
 	glog.V(4).Infof("The Turbo API client is create successfully: %v", apiClient)
+
+	// Login to obtain the session cookie
+	_, err = apiClient.Login()
+	if err != nil {
+		glog.Errorf("Cannot login to the Turbo API Client: %v", err)
+		return builder
+	}
+
 	builder.tapService.Client = apiClient
 
 	return builder