Instantiation and termination of a given context implementation.

Issue-ID: MULTICLOUD-1005
Signed-off-by: Manjunath Ranganathaiah <manjunath.ranganathaiah@intel.com>
Change-Id: I60e11aaad97b60efc24a02866dc0e580507e5296

10 files changed, 1144 insertions, 17 deletions

diff --git a/src/rsync/cmd/main.go b/src/rsync/cmd/main.go
index f46fa79b..95c36e20 100644
--- a/src/rsync/cmd/main.go
+++ b/src/rsync/cmd/main.go
@@ -81,7 +81,6 @@ func main() {
 	// Initialize the mongodb
 	err := db.InitializeDatabaseConnection("mco")
 	if err != nil {
-		fmt.Println(" Exiting mongod ")
 		log.Println("Unable to initialize database connection...")
 		log.Println(err)
 		log.Fatalln("Exiting...")
@@ -90,14 +89,13 @@ func main() {
 	// Initialize contextdb
 	err = contextDb.InitializeContextDatabase()
 	if err != nil {
-		fmt.Println(" Exiting etcd")
 		log.Println("Unable to initialize database connection...")
 		log.Println(err)
 		log.Fatalln("Exiting...")
 	}
 
 	// Start grpc
-	fmt.Println("starting rsync GRPC server..")
+	log.Println("starting rsync GRPC server..")
 	err = startGrpcServer()
 	if err != nil {
 		log.Fatalf("GRPC server failed to start")
diff --git a/src/rsync/go.mod b/src/rsync/go.mod
index 9c3362ce..a2c5f83b 100644
--- a/src/rsync/go.mod
+++ b/src/rsync/go.mod
@@ -3,13 +3,15 @@ module github.com/onap/multicloud-k8s/src/rsync
 go 1.13
 
 require (
-	github.com/golang/protobuf v1.3.4
+	github.com/golang/protobuf v1.4.1
+	github.com/googleapis/gnostic v0.4.0
+	github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4 // indirect
+	github.com/grpc-ecosystem/grpc-gateway v1.9.5 // indirect
+	github.com/mattn/go-isatty v0.0.4 // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/onap/multicloud-k8s/src/orchestrator v0.0.0-20200601021239-7959bd4c6fd4
-	golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3 // indirect
-	google.golang.org/appengine v1.4.0 // indirect
+	go.etcd.io/bbolt v1.3.3 // indirect
 	google.golang.org/grpc v1.27.1
-	honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc // indirect
-	github.com/googleapis/gnostic v0.4.0
 	k8s.io/kubernetes v1.14.1
 )
 
diff --git a/src/rsync/go.sum b/src/rsync/go.sum
index 270417c2..c49c5b07 100644
--- a/src/rsync/go.sum
+++ b/src/rsync/go.sum
@@ -742,6 +742,8 @@ google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2El
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20200305110556-506484158171 h1:xes2Q2k+d/+YNXVw0FpZkIDJiaux4OVrRKXRAzH6A0U=
 google.golang.org/genproto v0.0.0-20200305110556-506484158171/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
+google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 h1:+kGHl1aib/qcwaRi1CbqBZ1rk19r85MNUf8HaBghugY=
+google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0 h1:cfg4PD8YEdSFnm7qLV4++93WcmhH2nIUhMjhdCvl3j8=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
@@ -765,6 +767,9 @@ google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miE
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 google.golang.org/protobuf v1.22.0 h1:cJv5/xdbk1NnMPR1VP9+HU6gupuG9MLBoH1r6RHZ2MY=
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.24.0 h1:UhZDfRO8JRQru4/+LlLE0BRKGF8L+PICnvYZmx/fEGA=
+google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/src/rsync/pkg/app/client.go b/src/rsync/pkg/app/client.go
new file mode 100644
index 00000000..fb57d46b
--- /dev/null
+++ b/src/rsync/pkg/app/client.go
@@ -0,0 +1,154 @@
+/*
+Copyright 2018 Intel Corporation.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package app
+
+import (
+	"os"
+	"strings"
+	"time"
+	"encoding/base64"
+
+	pkgerrors "github.com/pkg/errors"
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/client-go/discovery/cached/disk"
+	"k8s.io/client-go/dynamic"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/restmapper"
+	"k8s.io/client-go/tools/clientcmd"
+
+	"github.com/onap/multicloud-k8s/src/clm/pkg/cluster"
+)
+
+const basePath string = "/tmp/rsync/"
+
+// KubernetesClient encapsulates the different clients' interfaces
+// we need when interacting with a Kubernetes cluster
+type KubernetesClient struct {
+	clientSet      kubernetes.Interface
+	dynamicClient  dynamic.Interface
+	discoverClient *disk.CachedDiscoveryClient
+	restMapper     meta.RESTMapper
+	instanceID     string
+}
+
+// getKubeConfig uses the connectivity client to get the kubeconfig based on the name
+// of the clustername. This is written out to a file.
+func (k *KubernetesClient) getKubeConfig(clustername string, id string) (string, error) {
+
+	if !strings.Contains(clustername, "+") {
+		return "", pkgerrors.New("Not a valid cluster name")
+	}
+	strs := strings.Split(clustername, "+")
+	if len(strs) != 2 {
+		return "", pkgerrors.New("Not a valid cluster name")
+	}
+	kubeConfig, err := cluster.NewClusterClient().GetClusterContent(strs[0], strs[1])
+	if err != nil {
+		return "", pkgerrors.New("Get kubeconfig failed")
+	}
+
+	var kubeConfigPath string = basePath + id + "/" + clustername + "/"
+
+	if _, err := os.Stat(kubeConfigPath); os.IsNotExist(err) {
+		err = os.MkdirAll(kubeConfigPath, 0755)
+			if err != nil {
+				return "", err
+			}
+	}
+	kubeConfigPath = kubeConfigPath + "config"
+
+	f, err := os.Create(kubeConfigPath)
+	defer f.Close()
+	if err != nil {
+		return "", err
+	}
+	dec, err := base64.StdEncoding.DecodeString(kubeConfig.Kubeconfig)
+	if err != nil {
+		return "", err
+	}
+	_, err = f.Write(dec)
+	if err != nil {
+		return "", err
+	}
+
+	return kubeConfigPath, nil
+}
+
+// init loads the Kubernetes configuation values stored into the local configuration file
+func (k *KubernetesClient) Init(clustername string, iid string) error {
+	if clustername == "" {
+		return pkgerrors.New("Cloudregion is empty")
+	}
+
+	if iid == "" {
+		return pkgerrors.New("Instance ID is empty")
+	}
+
+	k.instanceID = iid
+
+	configPath, err := k.getKubeConfig(clustername, iid)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Get kubeconfig file")
+	}
+
+	//Remove kubeconfigfile after the clients are created
+	defer os.Remove(configPath)
+
+	config, err := clientcmd.BuildConfigFromFlags("", configPath)
+	if err != nil {
+		return pkgerrors.Wrap(err, "setConfig: Build config from flags raised an error")
+	}
+
+	k.clientSet, err = kubernetes.NewForConfig(config)
+	if err != nil {
+		return err
+	}
+
+	k.dynamicClient, err = dynamic.NewForConfig(config)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Creating dynamic client")
+	}
+
+	k.discoverClient, err = disk.NewCachedDiscoveryClientForConfig(config, os.TempDir(), "", 10*time.Minute)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Creating discovery client")
+	}
+
+	k.restMapper = restmapper.NewDeferredDiscoveryRESTMapper(k.discoverClient)
+
+	return nil
+}
+
+//GetMapper returns the RESTMapper that was created for this client
+func (k *KubernetesClient) GetMapper() meta.RESTMapper {
+	return k.restMapper
+}
+
+//GetDynamicClient returns the dynamic client that is needed for
+//unstructured REST calls to the apiserver
+func (k *KubernetesClient) GetDynamicClient() dynamic.Interface {
+	return k.dynamicClient
+}
+
+// GetStandardClient returns the standard client that can be used to handle
+// standard kubernetes kinds
+func (k *KubernetesClient) GetStandardClient() kubernetes.Interface {
+	return k.clientSet
+}
+
+//GetInstanceID returns the instanceID that is injected into all the
+//resources created by the plugin
+func (k *KubernetesClient) GetInstanceID() string {
+	return k.instanceID
+}
diff --git a/src/rsync/pkg/connector/connector.go b/src/rsync/pkg/connector/connector.go
new file mode 100644
index 00000000..6e17f87a
--- /dev/null
+++ b/src/rsync/pkg/connector/connector.go
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2019 Intel Corporation, Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package connector
+
+import (
+	"log"
+
+	"github.com/onap/multicloud-k8s/src/rsync/pkg/internal/config"
+
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/dynamic"
+	"k8s.io/client-go/kubernetes"
+)
+
+// KubernetesConnector is an interface that is expected to be implemented
+// by any code that calls the plugin framework functions.
+// It implements methods that are needed by the plugins to get Kubernetes
+// clients and other information needed to interface with Kubernetes
+type KubernetesConnector interface {
+	//GetMapper returns the RESTMapper that was created for this client
+	GetMapper() meta.RESTMapper
+
+	//GetDynamicClient returns the dynamic client that is needed for
+	//unstructured REST calls to the apiserver
+	GetDynamicClient() dynamic.Interface
+
+	// GetStandardClient returns the standard client that can be used to handle
+	// standard kubernetes kinds
+	GetStandardClient() kubernetes.Interface
+
+	//GetInstanceID returns the InstanceID for tracking during creation
+	GetInstanceID() string
+}
+
+// Reference is the interface that is implemented
+type Reference interface {
+	//Create a kubernetes resource described by the yaml in yamlFilePath
+	Create(yamlFilePath string, namespace string, client KubernetesConnector) (string, error)
+	//Delete a kubernetes resource described in the provided namespace
+	Delete(yamlFilePath string, resname string, namespace string, client KubernetesConnector) error
+}
+
+// TagPodsIfPresent finds the PodTemplateSpec from any workload
+// object that contains it and changes the spec to include the tag label
+func TagPodsIfPresent(unstruct *unstructured.Unstructured, tag string) {
+
+	spec, ok := unstruct.Object["spec"].(map[string]interface{})
+	if !ok {
+		log.Println("Error converting spec to map")
+		return
+	}
+
+	template, ok := spec["template"].(map[string]interface{})
+	if !ok {
+		log.Println("Error converting template to map")
+		return
+	}
+
+	//Attempt to convert the template to a podtemplatespec.
+	//This is to check if we have any pods being created.
+	podTemplateSpec := &corev1.PodTemplateSpec{}
+	err := runtime.DefaultUnstructuredConverter.FromUnstructured(template, podTemplateSpec)
+	if err != nil {
+		log.Println("Did not find a podTemplateSpec: " + err.Error())
+		return
+	}
+
+	labels := podTemplateSpec.GetLabels()
+	if labels == nil {
+		labels = map[string]string{}
+	}
+	labels[config.GetConfiguration().KubernetesLabelName] = tag
+	podTemplateSpec.SetLabels(labels)
+
+	updatedTemplate, err := runtime.DefaultUnstructuredConverter.ToUnstructured(podTemplateSpec)
+
+	//Set the label
+	spec["template"] = updatedTemplate
+}
diff --git a/src/rsync/pkg/context/context.go b/src/rsync/pkg/context/context.go
new file mode 100644
index 00000000..67e589c9
--- /dev/null
+++ b/src/rsync/pkg/context/context.go
@@ -0,0 +1,547 @@
+/*
+ * Copyright 2020 Intel Corporation, Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package context
+
+import (
+	"encoding/json"
+        "fmt"
+        "log"
+        "os"
+        "sync"
+        "strings"
+        "github.com/onap/multicloud-k8s/src/orchestrator/pkg/appcontext"
+        pkgerrors "github.com/pkg/errors"
+        res "github.com/onap/multicloud-k8s/src/rsync/pkg/resource"
+        con "github.com/onap/multicloud-k8s/src/rsync/pkg/connector"
+        "github.com/onap/multicloud-k8s/src/rsync/pkg/app"
+)
+
+type CompositeAppContext struct {
+	cid    interface{}
+	appsorder      string
+	appsdependency string
+	appsmap []instMap
+}
+type clusterInfo struct {
+	name   string
+	resorder      string
+	resdependency string
+	ressmap []instMap
+}
+type instMap struct {
+	name    string
+	depinfo string
+	status  string
+	rerr    error
+	clusters []clusterInfo
+}
+
+const basePath string = "/tmp/rsync/"
+
+func getInstMap(order string, dependency string, level string) ([]instMap, error) {
+
+        if order == "" {
+              return nil, pkgerrors.Errorf("Not a valid order value")
+        }
+        if dependency == "" {
+              return nil, pkgerrors.Errorf("Not a valid dependency value")
+        }
+
+        if !(level == "app" || level == "res") {
+              return nil, pkgerrors.Errorf("Not a valid level name given to create map")
+        }
+
+
+        var aov map[string]interface{}
+        json.Unmarshal([]byte(order), &aov)
+
+        s := fmt.Sprintf("%vorder", level)
+        appso := aov[s].([]interface{})
+        var instmap = make([]instMap, len(appso))
+
+        var adv map[string]interface{}
+        json.Unmarshal([]byte(dependency), &adv)
+        s = fmt.Sprintf("%vdependency", level)
+        appsd := adv[s].(map[string]interface{})
+        for i, u := range appso {
+                instmap[i] = instMap{u.(string), appsd[u.(string)].(string), "none", nil, nil}
+        }
+
+        return instmap, nil
+}
+
+func deleteResource(clustername string, resname string, respath string) error {
+	k8sClient := app.KubernetesClient{}
+	err := k8sClient.Init(clustername, resname)
+	if err != nil {
+		log.Println("Init failed: " + err.Error())
+		return err
+	}
+
+	var c con.KubernetesConnector
+	c = &k8sClient
+	var gp res.Resource
+	err = gp.Delete(respath, resname, "default", c)
+	if err != nil {
+		log.Println("Delete resource failed: " +  err.Error())
+		return err
+	}
+	log.Println("Resource succesfully deleted")
+	return nil
+
+}
+
+func createResource(clustername string, resname string, respath string) error {
+	k8sClient := app.KubernetesClient{}
+	err := k8sClient.Init(clustername, resname)
+	if err != nil {
+		log.Println("Client init failed: " + err.Error())
+		return err
+	}
+
+	var c con.KubernetesConnector
+	c = &k8sClient
+	var gp res.Resource
+	_, err = gp.Create(respath,"default", c)
+	if err != nil {
+		log.Println("Create failed: " +  err.Error())
+		return err
+	}
+	log.Println("Resource succesfully created")
+	return nil
+
+}
+
+func terminateResource(ac appcontext.AppContext, resmap instMap, appname string, clustername string) error {
+	var resPath string = basePath + appname + "/" + clustername + "/resources/"
+	rh, err := ac.GetResourceHandle(appname, clustername, resmap.name)
+	if err != nil {
+		return err
+	}
+
+	resval, err := ac.GetValue(rh)
+	if err != nil {
+		return err
+	}
+
+	if resval != "" {
+		if _, err := os.Stat(resPath); os.IsNotExist(err) {
+			err = os.MkdirAll(resPath, 0755)
+			if err != nil {
+				return err
+			}
+		}
+		resPath := resPath + resmap.name + ".yaml"
+		f, err := os.Create(resPath)
+		defer f.Close()
+		if err != nil {
+			return err
+		}
+		_, err = f.WriteString(resval.(string))
+		if err != nil {
+			return err
+		}
+		result := strings.Split(resmap.name, "+")
+		if result[0] == "" {
+			return pkgerrors.Errorf("Resource name is nil")
+		}
+		err = deleteResource(clustername, result[0], resPath)
+		if err != nil {
+			return err
+		}
+		//defer os.Remove(resPath)
+	} else {
+		return pkgerrors.Errorf("Resource value is nil")
+	}
+
+	return nil
+
+}
+
+func instantiateResource(ac appcontext.AppContext, resmap instMap, appname string, clustername string) error {
+	var resPath string = basePath + appname + "/" + clustername + "/resources/"
+	rh, err := ac.GetResourceHandle(appname, clustername, resmap.name)
+	if err != nil {
+		return err
+	}
+
+	resval, err := ac.GetValue(rh)
+	if err != nil {
+		return err
+	}
+
+	if resval != "" {
+		if _, err := os.Stat(resPath); os.IsNotExist(err) {
+			err = os.MkdirAll(resPath, 0755)
+			if err != nil {
+				return err
+			}
+		}
+		resPath := resPath + resmap.name + ".yaml"
+		f, err := os.Create(resPath)
+		defer f.Close()
+		if err != nil {
+			return err
+		}
+		_, err = f.WriteString(resval.(string))
+		if err != nil {
+			return err
+		}
+		result := strings.Split(resmap.name, "+")
+		if result[0] == "" {
+			return pkgerrors.Errorf("Resource name is nil")
+		}
+		err = createResource(clustername, result[0], resPath)
+		if err != nil {
+			return err
+		}
+		//defer os.Remove(resPath)
+	} else {
+		return pkgerrors.Errorf("Resource value is nil")
+	}
+
+	return nil
+
+}
+
+func  terminateResources(ac appcontext.AppContext, ressmap []instMap, appname string, clustername string) error {
+        var wg sync.WaitGroup
+        var chans = make([]chan int, len(ressmap))
+        for l := range chans {
+                chans[l] = make(chan int)
+        }
+        for i:=0; i<len(ressmap); i++ {
+                wg.Add(1)
+                go func(index int) {
+                        if ressmap[index].depinfo == "go" {
+                                ressmap[index].status = "start"
+                        } else {
+                                ressmap[index].status = "waiting"
+                                c := <- chans[index]
+                                if c != index {
+					ressmap[index].status = "error"
+                                        ressmap[index].rerr = pkgerrors.Errorf("channel does not match")
+					wg.Done()
+					return
+                                }
+                                ressmap[index].status = "start"
+                        }
+                        ressmap[index].rerr = terminateResource(ac, ressmap[index], appname, clustername)
+                        ressmap[index].status = "done"
+                        waitstr := fmt.Sprintf("wait on %v",ressmap[index].name)
+                        for j:=0; j<len(ressmap); j++ {
+                                if ressmap[j].depinfo == waitstr {
+                                        chans[j] <- j
+                                }
+                        }
+                        wg.Done()
+                }(i)
+        }
+        wg.Wait()
+        for k:=0; k<len(ressmap); k++ {
+                if ressmap[k].rerr != nil {
+                        return pkgerrors.Errorf("error during resources termination")
+                }
+        }
+        return nil
+
+}
+
+func  instantiateResources(ac appcontext.AppContext, ressmap []instMap, appname string, clustername string) error {
+        var wg sync.WaitGroup
+        var chans = make([]chan int, len(ressmap))
+        for l := range chans {
+                chans[l] = make(chan int)
+        }
+        for i:=0; i<len(ressmap); i++ {
+                wg.Add(1)
+                go func(index int) {
+                        if ressmap[index].depinfo == "go" {
+                                ressmap[index].status = "start"
+                        } else {
+                                ressmap[index].status = "waiting"
+                                c := <- chans[index]
+                                if c != index {
+					ressmap[index].status = "error"
+                                        ressmap[index].rerr = pkgerrors.Errorf("channel does not match")
+					wg.Done()
+					return
+                                }
+                                ressmap[index].status = "start"
+                        }
+                        ressmap[index].rerr = instantiateResource(ac, ressmap[index], appname, clustername)
+                        ressmap[index].status = "done"
+                        waitstr := fmt.Sprintf("wait on %v",ressmap[index].name)
+                        for j:=0; j<len(ressmap); j++ {
+                                if ressmap[j].depinfo == waitstr {
+                                        chans[j] <- j
+                                }
+                        }
+                        wg.Done()
+                }(i)
+        }
+        wg.Wait()
+        for k:=0; k<len(ressmap); k++ {
+                if ressmap[k].rerr != nil {
+                        return pkgerrors.Errorf("error during resources instantiation")
+                }
+        }
+        return nil
+
+}
+
+func terminateApp(ac appcontext.AppContext, appmap instMap) error {
+
+        for i:=0; i<len(appmap.clusters); i++ {
+		err := terminateResources(ac, appmap.clusters[i].ressmap, appmap.name,
+				appmap.clusters[i].name)
+		if err != nil {
+			return err
+		}
+	}
+	log.Println("Termination of app done: " + appmap.name)
+
+	return nil
+
+}
+
+
+func instantiateApp(ac appcontext.AppContext, appmap instMap) error {
+
+        for i:=0; i<len(appmap.clusters); i++ {
+		err := instantiateResources(ac, appmap.clusters[i].ressmap, appmap.name,
+				appmap.clusters[i].name)
+		if err != nil {
+			return err
+		}
+	}
+	log.Println("Instantiation of app done: " + appmap.name)
+	return nil
+
+}
+
+func  instantiateApps(ac appcontext.AppContext, appsmap []instMap) error {
+	var wg sync.WaitGroup
+	var chans = make([]chan int, len(appsmap))
+	for l := range chans {
+		chans[l] = make(chan int)
+	}
+        for i:=0; i<len(appsmap); i++ {
+		wg.Add(1)
+                go func(index int) {
+                        if appsmap[index].depinfo == "go" {
+				appsmap[index].status = "start"
+			} else {
+				appsmap[index].status = "waiting"
+				c := <- chans[index]
+				if c != index {
+					appsmap[index].status = "error"
+                                        appsmap[index].rerr = pkgerrors.Errorf("channel does not match")
+					wg.Done()
+					return
+				}
+				appsmap[index].status = "start"
+			}
+			appsmap[index].rerr = instantiateApp(ac, appsmap[index])
+			appsmap[index].status = "done"
+			waitstr := fmt.Sprintf("wait on %v",appsmap[index].name)
+			for j:=0; j<len(appsmap); j++ {
+				if appsmap[j].depinfo == waitstr {
+					chans[j] <- j
+				}
+			}
+			wg.Done()
+                }(i)
+        }
+	wg.Wait()
+	for k:=0; k<len(appsmap); k++ {
+		if appsmap[k].rerr != nil {
+			return pkgerrors.Errorf("error during apps instantiation")
+		}
+	}
+	return nil
+
+}
+
+func (instca *CompositeAppContext) InstantiateComApp(cid interface{}) error {
+	ac := appcontext.AppContext{}
+
+	_, err := ac.LoadAppContext(cid)
+        if err != nil {
+                return err
+        }
+	instca.cid = cid
+
+	appsorder, err := ac.GetAppInstruction("order")
+        if err != nil {
+                return err
+        }
+	instca.appsorder = appsorder.(string)
+	appsdependency, err := ac.GetAppInstruction("dependency")
+        if err != nil {
+                return err
+        }
+	instca.appsdependency = appsdependency.(string)
+        instca.appsmap, err = getInstMap(instca.appsorder,instca.appsdependency, "app")
+        if err != nil {
+                return err
+        }
+
+	for j:=0; j<len(instca.appsmap); j++ {
+		clusternames, err := ac.GetClusterNames(instca.appsmap[j].name)
+		if err != nil {
+	                return err
+		}
+		instca.appsmap[j].clusters = make([]clusterInfo, len(clusternames))
+		for k:=0; k<len(clusternames); k++ {
+			instca.appsmap[j].clusters[k].name = clusternames[k]
+			resorder, err := ac.GetResourceInstruction(
+					instca.appsmap[j].name, clusternames[k], "order")
+			if err != nil {
+		                return err
+			}
+			instca.appsmap[j].clusters[k].resorder = resorder.(string)
+
+			resdependency, err := ac.GetResourceInstruction(
+					instca.appsmap[j].name, clusternames[k], "dependency")
+			if err != nil {
+		                return err
+			}
+			instca.appsmap[j].clusters[k].resdependency = resdependency.(string)
+
+			instca.appsmap[j].clusters[k].ressmap, err = getInstMap(
+				instca.appsmap[j].clusters[k].resorder,
+				instca.appsmap[j].clusters[k].resdependency, "res")
+			if err != nil {
+		                return err
+			}
+		}
+	}
+	err = instantiateApps(ac, instca.appsmap)
+        if err != nil {
+                return err
+        }
+
+	return nil
+}
+
+// Delete all the apps
+func  terminateApps(ac appcontext.AppContext, appsmap []instMap) error {
+	var wg sync.WaitGroup
+	var chans = make([]chan int, len(appsmap))
+	for l := range chans {
+		chans[l] = make(chan int)
+	}
+        for i:=0; i<len(appsmap); i++ {
+		wg.Add(1)
+                go func(index int) {
+                        if appsmap[index].depinfo == "go" {
+				appsmap[index].status = "start"
+			} else {
+				appsmap[index].status = "waiting"
+				c := <- chans[index]
+				if c != index {
+					appsmap[index].status = "error"
+                                        appsmap[index].rerr = pkgerrors.Errorf("channel does not match")
+					wg.Done()
+					return
+				}
+				appsmap[index].status = "start"
+			}
+			appsmap[index].rerr = terminateApp(ac, appsmap[index])
+			appsmap[index].status = "done"
+			waitstr := fmt.Sprintf("wait on %v",appsmap[index].name)
+			for j:=0; j<len(appsmap); j++ {
+				if appsmap[j].depinfo == waitstr {
+					chans[j] <- j
+				}
+			}
+			wg.Done()
+                }(i)
+        }
+	wg.Wait()
+	for k:=0; k<len(appsmap); k++ {
+		if appsmap[k].rerr != nil {
+			return pkgerrors.Errorf("error during apps instantiation")
+		}
+	}
+	return nil
+
+}
+// Delete all the resources for a given context
+func (instca *CompositeAppContext) TerminateComApp(cid interface{}) error {
+	ac := appcontext.AppContext{}
+
+	_, err := ac.LoadAppContext(cid)
+        if err != nil {
+                return err
+        }
+	instca.cid = cid
+
+	appsorder, err := ac.GetAppInstruction("order")
+        if err != nil {
+                return err
+        }
+	instca.appsorder = appsorder.(string)
+	appsdependency, err := ac.GetAppInstruction("dependency")
+        if err != nil {
+                return err
+        }
+	instca.appsdependency = appsdependency.(string)
+        instca.appsmap, err = getInstMap(instca.appsorder,instca.appsdependency, "app")
+        if err != nil {
+                return err
+        }
+
+	for j:=0; j<len(instca.appsmap); j++ {
+		clusternames, err := ac.GetClusterNames(instca.appsmap[j].name)
+		if err != nil {
+	                return err
+		}
+		instca.appsmap[j].clusters = make([]clusterInfo, len(clusternames))
+		for k:=0; k<len(clusternames); k++ {
+			instca.appsmap[j].clusters[k].name = clusternames[k]
+			resorder, err := ac.GetResourceInstruction(
+					instca.appsmap[j].name, clusternames[k], "order")
+			if err != nil {
+		                return err
+			}
+			instca.appsmap[j].clusters[k].resorder = resorder.(string)
+
+			resdependency, err := ac.GetResourceInstruction(
+					instca.appsmap[j].name, clusternames[k], "dependency")
+			if err != nil {
+		                return err
+			}
+			instca.appsmap[j].clusters[k].resdependency = resdependency.(string)
+
+			instca.appsmap[j].clusters[k].ressmap, err = getInstMap(
+				instca.appsmap[j].clusters[k].resorder,
+				instca.appsmap[j].clusters[k].resdependency, "res")
+			if err != nil {
+		                return err
+			}
+		}
+	}
+	err = terminateApps(ac, instca.appsmap)
+        if err != nil {
+                return err
+        }
+
+	return nil
+
+}
diff --git a/src/rsync/pkg/grpc/installappserver/installappserver.go b/src/rsync/pkg/grpc/installappserver/installappserver.go
index 28b4a585..68118ade 100644
--- a/src/rsync/pkg/grpc/installappserver/installappserver.go
+++ b/src/rsync/pkg/grpc/installappserver/installappserver.go
@@ -17,10 +17,8 @@ import (
 	"context"
 	"encoding/json"
 	"log"
-
 	"github.com/onap/multicloud-k8s/src/rsync/pkg/grpc/installapp"
-	//"google.golang.org/grpc/codes"
-	//"google.golang.org/grpc/status"
+	con "github.com/onap/multicloud-k8s/src/rsync/pkg/context"
 )
 
 type installappServer struct {
@@ -31,10 +29,17 @@ func (cs *installappServer) InstallApp(ctx context.Context, req *installapp.Inst
 	installAppReq, _ := json.Marshal(req)
 	log.Println("GRPC Server received installAppRequest: ", string(installAppReq))
 
-	// Insert call to Server Functionality here
-	//
-	//
-
+	// Try instantiate the comp app 
+	instca := con.CompositeAppContext{}
+        err := instca.InstantiateComApp(req.GetAppContext())
+        if err != nil {
+                log.Println("Instantiation failed: " +  err.Error())
+		err := instca.TerminateComApp(req.GetAppContext())
+		if err != nil {
+			log.Println("Termination failed: " + err.Error())
+		}
+		return &installapp.InstallAppResponse{AppContextInstalled: false}, err
+        }
 	return &installapp.InstallAppResponse{AppContextInstalled: true}, nil
 }
 
@@ -43,8 +48,12 @@ func (cs *installappServer) UninstallApp(ctx context.Context, req *installapp.Un
 	log.Println("GRPC Server received uninstallAppRequest: ", string(uninstallAppReq))
 
 	// Try terminating the comp app here
-	//
-	//
+	instca := con.CompositeAppContext{}
+	err := instca.TerminateComApp(req.GetAppContext())
+	if err != nil {
+		log.Println("Termination failed: " + err.Error())
+		return &installapp.UninstallAppResponse{AppContextUninstalled: false}, err
+	}
 
 	return &installapp.UninstallAppResponse{AppContextUninstalled: true}, nil
 }
diff --git a/src/rsync/pkg/internal/config/config.go b/src/rsync/pkg/internal/config/config.go
new file mode 100644
index 00000000..89f2553d
--- /dev/null
+++ b/src/rsync/pkg/internal/config/config.go
@@ -0,0 +1,128 @@
+/*
+ * Copyright 2019 Intel Corporation, Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package config
+
+import (
+	"encoding/json"
+	"log"
+	"os"
+	"reflect"
+)
+
+// Configuration loads up all the values that are used to configure
+// backend implementations
+type Configuration struct {
+	CAFile              string `json:"ca-file"`
+	ServerCert          string `json:"server-cert"`
+	ServerKey           string `json:"server-key"`
+	Password            string `json:"password"`
+	DatabaseAddress     string `json:"database-address"`
+	DatabaseType        string `json:"database-type"`
+	PluginDir           string `json:"plugin-dir"`
+	EtcdIP              string `json:"etcd-ip"`
+	EtcdCert            string `json:"etcd-cert"`
+	EtcdKey             string `json:"etcd-key"`
+	EtcdCAFile          string `json:"etcd-ca-file"`
+	ServicePort         string `json:"service-port"`
+	KubernetesLabelName string `json:"kubernetes-label-name"`
+}
+
+// Config is the structure that stores the configuration
+var gConfig *Configuration
+
+// readConfigFile reads the specified smsConfig file to setup some env variables
+func readConfigFile(file string) (*Configuration, error) {
+	f, err := os.Open(file)
+	if err != nil {
+		return defaultConfiguration(), err
+	}
+	defer f.Close()
+
+	// Setup some defaults here
+	// If the json file has values in it, the defaults will be overwritten
+	conf := defaultConfiguration()
+
+	// Read the configuration from json file
+	decoder := json.NewDecoder(f)
+	err = decoder.Decode(conf)
+	if err != nil {
+		return conf, err
+	}
+
+	return conf, nil
+}
+
+func defaultConfiguration() *Configuration {
+	cwd, err := os.Getwd()
+	if err != nil {
+		log.Println("Error getting cwd. Using .")
+		cwd = "."
+	}
+
+	return &Configuration{
+		CAFile:              "ca.cert",
+		ServerCert:          "server.cert",
+		ServerKey:           "server.key",
+		Password:            "",
+		DatabaseAddress:     "127.0.0.1",
+		DatabaseType:        "mongo",
+		PluginDir:           cwd,
+		EtcdIP:              "127.0.0.1",
+		EtcdCert:            "",
+		EtcdKey:             "",
+		EtcdCAFile:          "",
+		ServicePort:         "9015",
+		KubernetesLabelName: "k8splugin.io/rb-instance-id",
+	}
+}
+
+// GetConfiguration returns the configuration for the app.
+// It will try to load it if it is not already loaded.
+func GetConfiguration() *Configuration {
+	if gConfig == nil {
+		conf, err := readConfigFile("k8sconfig.json")
+		if err != nil {
+			log.Println("Error loading config file. Using defaults.")
+		}
+		gConfig = conf
+	}
+
+	return gConfig
+}
+
+// SetConfigValue sets a value in the configuration
+// This is mostly used to customize the application and
+// should be used carefully.
+func SetConfigValue(key string, value string) *Configuration {
+	c := GetConfiguration()
+	if value == "" || key == "" {
+		return c
+	}
+
+	v := reflect.ValueOf(c).Elem()
+	if v.Kind() == reflect.Struct {
+		f := v.FieldByName(key)
+		if f.IsValid() {
+			if f.CanSet() {
+				if f.Kind() == reflect.String {
+					f.SetString(value)
+				}
+			}
+		}
+	}
+	return c
+}
diff --git a/src/rsync/pkg/internal/utils.go b/src/rsync/pkg/internal/utils.go
new file mode 100644
index 00000000..59ff6df8
--- /dev/null
+++ b/src/rsync/pkg/internal/utils.go
@@ -0,0 +1,59 @@
+/*
+Copyright 2018 Intel Corporation.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package utils
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+
+	pkgerrors "github.com/pkg/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/kubernetes/scheme"
+)
+
+// DecodeYAML reads a YAMl file to extract the Kubernetes object definition
+func DecodeYAML(path string, into runtime.Object) (runtime.Object, error) {
+	if _, err := os.Stat(path); err != nil {
+		if os.IsNotExist(err) {
+			return nil, pkgerrors.New("File " + path + " not found")
+		} else {
+			return nil, pkgerrors.Wrap(err, "Stat file error")
+		}
+	}
+
+	rawBytes, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, pkgerrors.Wrap(err, "Read YAML file error")
+	}
+
+	decode := scheme.Codecs.UniversalDeserializer().Decode
+	obj, _, err := decode(rawBytes, nil, into)
+	if err != nil {
+		return nil, pkgerrors.Wrap(err, "Deserialize YAML error")
+	}
+
+	return obj, nil
+}
+
+//EnsureDirectory makes sure that the directories specified in the path exist
+//If not, it will create them, if possible.
+func EnsureDirectory(f string) error {
+	base := path.Dir(f)
+	_, err := os.Stat(base)
+	if err != nil && !os.IsNotExist(err) {
+		return err
+	}
+	return os.MkdirAll(base, 0755)
+}
diff --git a/src/rsync/pkg/resource/resource.go b/src/rsync/pkg/resource/resource.go
new file mode 100644
index 00000000..9d715697
--- /dev/null
+++ b/src/rsync/pkg/resource/resource.go
@@ -0,0 +1,129 @@
+/*
+Copyright 2018 Intel Corporation.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package resource
+
+import (
+	pkgerrors "github.com/pkg/errors"
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	utils "github.com/onap/multicloud-k8s/src/rsync/pkg/internal"
+	"github.com/onap/multicloud-k8s/src/rsync/pkg/internal/config"
+	"github.com/onap/multicloud-k8s/src/rsync/pkg/connector"
+)
+
+type Resource struct {
+}
+
+// Create deployment object in a specific Kubernetes cluster
+func (r Resource) Create(yamlFilePath string, namespace string, client connector.KubernetesConnector) (string, error) {
+	if namespace == "" {
+		namespace = "default"
+	}
+
+	//Decode the yaml file to create a runtime.Object
+	unstruct := &unstructured.Unstructured{}
+	//Ignore the returned obj as we expect the data in unstruct
+	_, err := utils.DecodeYAML(yamlFilePath, unstruct)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Decode deployment object error")
+	}
+
+	dynClient := client.GetDynamicClient()
+	mapper := client.GetMapper()
+
+	gvk := unstruct.GroupVersionKind()
+	mapping, err := mapper.RESTMapping(schema.GroupKind{Group: gvk.Group, Kind: gvk.Kind}, gvk.Version)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Mapping kind to resource error")
+	}
+
+	//Add the tracking label to all resources created here
+	labels := unstruct.GetLabels()
+	//Check if labels exist for this object
+	if labels == nil {
+		labels = map[string]string{}
+	}
+	labels[config.GetConfiguration().KubernetesLabelName] = client.GetInstanceID()
+	unstruct.SetLabels(labels)
+
+	// This checks if the resource we are creating has a podSpec in it
+	// Eg: Deployment, StatefulSet, Job etc..
+	// If a PodSpec is found, the label will be added to it too.
+	connector.TagPodsIfPresent(unstruct, client.GetInstanceID())
+
+	gvr := mapping.Resource
+	var createdObj *unstructured.Unstructured
+
+	switch mapping.Scope.Name() {
+	case meta.RESTScopeNameNamespace:
+		createdObj, err = dynClient.Resource(gvr).Namespace(namespace).Create(unstruct, metav1.CreateOptions{})
+	case meta.RESTScopeNameRoot:
+		createdObj, err = dynClient.Resource(gvr).Create(unstruct, metav1.CreateOptions{})
+	default:
+		return "", pkgerrors.New("Got an unknown RESTSCopeName for mapping: " + gvk.String())
+	}
+
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Create object error")
+	}
+
+	return createdObj.GetName(), nil
+}
+
+// Delete an existing resource hosted in a specific Kubernetes cluster
+func (r Resource) Delete(yamlFilePath string, resname string, namespace string, client connector.KubernetesConnector) error {
+        if namespace == "" {
+                namespace = "default"
+        }
+
+        //Decode the yaml file to create a runtime.Object
+        unstruct := &unstructured.Unstructured{}
+        //Ignore the returned obj as we expect the data in unstruct
+        _, err := utils.DecodeYAML(yamlFilePath, unstruct)
+        if err != nil {
+                return pkgerrors.Wrap(err, "Decode deployment object error")
+        }
+
+        dynClient := client.GetDynamicClient()
+        mapper := client.GetMapper()
+
+        gvk := unstruct.GroupVersionKind()
+        mapping, err := mapper.RESTMapping(schema.GroupKind{Group: gvk.Group, Kind: gvk.Kind}, gvk.Version)
+        if err != nil {
+                return pkgerrors.Wrap(err, "Mapping kind to resource error")
+        }
+
+        gvr := mapping.Resource
+        deletePolicy := metav1.DeletePropagationForeground
+        opts := &metav1.DeleteOptions{
+                PropagationPolicy: &deletePolicy,
+        }
+
+        switch mapping.Scope.Name() {
+        case meta.RESTScopeNameNamespace:
+                err = dynClient.Resource(gvr).Namespace(namespace).Delete(resname, opts)
+        case meta.RESTScopeNameRoot:
+                err = dynClient.Resource(gvr).Delete(resname, opts)
+        default:
+                return pkgerrors.New("Got an unknown RESTSCopeName for mappin")
+        }
+
+        if err != nil {
+                return pkgerrors.Wrap(err, "Delete object error")
+        }
+        return nil
+}