Refactor instance code

Issue-ID: MULTICLOUD-350
Change-Id: I2574d94e4ebada1e138913b2a03549dd90906d7b
Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>

1 files changed, 191 insertions, 0 deletions

diff --git a/src/k8splugin/api/instancehandler.go b/src/k8splugin/api/instancehandler.go
new file mode 100644
index 00000000..4fc3cfc8
--- /dev/null
+++ b/src/k8splugin/api/instancehandler.go
@@ -0,0 +1,191 @@
+/*
+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 api
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+
+	"k8splugin/internal/app"
+
+	"github.com/gorilla/mux"
+	pkgerrors "github.com/pkg/errors"
+)
+
+// Used to store the backend implementation objects
+// Also simplifies the mocking needed for unit testing
+type instanceHandler struct {
+	// Interface that implements the Instance operations
+	client app.InstanceManager
+}
+
+func (i instanceHandler) validateBody(body interface{}) error {
+	switch b := body.(type) {
+	case app.InstanceRequest:
+		if b.CloudRegion == "" {
+			werr := pkgerrors.Wrap(errors.New("Invalid/Missing CloudRegion in POST request"), "CreateVnfRequest bad request")
+			return werr
+		}
+		if b.RBName == "" || b.RBVersion == "" {
+			werr := pkgerrors.Wrap(errors.New("Invalid/Missing resource bundle parameters in POST request"), "CreateVnfRequest bad request")
+			return werr
+		}
+		if b.ProfileName == "" {
+			werr := pkgerrors.Wrap(errors.New("Invalid/Missing profile name in POST request"), "CreateVnfRequest bad request")
+			return werr
+		}
+	}
+	return nil
+}
+
+func (i instanceHandler) createHandler(w http.ResponseWriter, r *http.Request) {
+	var resource app.InstanceRequest
+
+	err := json.NewDecoder(r.Body).Decode(&resource)
+	switch {
+	case err == io.EOF:
+		http.Error(w, "Body empty", http.StatusBadRequest)
+		return
+	case err != nil:
+		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+		return
+	}
+
+	// Check body for expected parameters
+	err = i.validateBody(resource)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+		return
+	}
+
+	resp, err := i.client.Create(resource)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+// getHandler retrieves information about an instance via the ID
+func (i instanceHandler) getHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	id := vars["instID"]
+
+	resp, err := i.client.Get(id)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+// deleteHandler method terminates an instance via the ID
+func (i instanceHandler) deleteHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	id := vars["instID"]
+
+	err := i.client.Delete(id)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusAccepted)
+}
+
+// // UpdateHandler method to update a VNF instance.
+// func UpdateHandler(w http.ResponseWriter, r *http.Request) {
+// 	vars := mux.Vars(r)
+// 	id := vars["vnfInstanceId"]
+
+// 	var resource UpdateVnfRequest
+
+// 	if r.Body == nil {
+// 		http.Error(w, "Body empty", http.StatusBadRequest)
+// 		return
+// 	}
+
+// 	err := json.NewDecoder(r.Body).Decode(&resource)
+// 	if err != nil {
+// 		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+// 		return
+// 	}
+
+// 	err = validateBody(resource)
+// 	if err != nil {
+// 		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+// 		return
+// 	}
+
+// 	kubeData, err := utils.ReadCSARFromFileSystem(resource.CsarID)
+
+// 	if kubeData.Deployment == nil {
+// 		werr := pkgerrors.Wrap(err, "Update VNF deployment error")
+// 		http.Error(w, werr.Error(), http.StatusInternalServerError)
+// 		return
+// 	}
+// 	kubeData.Deployment.SetUID(types.UID(id))
+
+// 	if err != nil {
+// 		werr := pkgerrors.Wrap(err, "Update VNF deployment information error")
+// 		http.Error(w, werr.Error(), http.StatusInternalServerError)
+// 		return
+// 	}
+
+// 	// (TODO): Read kubeconfig for specific Cloud Region from local file system
+// 	// if present or download it from AAI
+// 	s, err := NewVNFInstanceService("../kubeconfig/config")
+// 	if err != nil {
+// 		http.Error(w, err.Error(), http.StatusInternalServerError)
+// 		return
+// 	}
+
+// 	err = s.Client.UpdateDeployment(kubeData.Deployment, resource.Namespace)
+// 	if err != nil {
+// 		werr := pkgerrors.Wrap(err, "Update VNF error")
+
+// 		http.Error(w, werr.Error(), http.StatusInternalServerError)
+// 		return
+// 	}
+
+// 	resp := UpdateVnfResponse{
+// 		DeploymentID: id,
+// 	}
+
+// 	w.Header().Set("Content-Type", "application/json")
+// 	w.WriteHeader(http.StatusCreated)
+
+// 	err = json.NewEncoder(w).Encode(resp)
+// 	if err != nil {
+// 		werr := pkgerrors.Wrap(err, "Parsing output of new VNF error")
+// 		http.Error(w, werr.Error(), http.StatusInternalServerError)
+// 	}
+// }