Seed code for k8s multicloud plugin

This patch provides the initial seed code for the multicloud Kubernetes
plugin and also provides the plugin feature to add new Kubernetes
kinds.

Change-Id: Ie5ee414656665070cde2834c4855ac2ebc179a9a
Issue-ID: MULTICLOUD-301
Signed-off-by: Shashank Kumar Shankar <shashank.kumar.shankar@intel.com>
Signed-off-by: Victor Morales <victor.morales@intel.com>

1 files changed, 120 insertions, 0 deletions

diff --git a/src/k8splugin/api/api.go b/src/k8splugin/api/api.go
new file mode 100644
index 00000000..651d9311
--- /dev/null
+++ b/src/k8splugin/api/api.go
@@ -0,0 +1,120 @@
+/*
+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 (
+	"os"
+	"path/filepath"
+	"plugin"
+	"strings"
+
+	"github.com/gorilla/mux"
+	pkgerrors "github.com/pkg/errors"
+
+	"k8splugin/db"
+	"k8splugin/krd"
+)
+
+// CheckEnvVariables checks for required Environment variables
+func CheckEnvVariables() error {
+	envList := []string{"CSAR_DIR", "KUBE_CONFIG_DIR", "DATABASE_TYPE", "DATABASE_IP"}
+	for _, env := range envList {
+		if _, ok := os.LookupEnv(env); !ok {
+			return pkgerrors.New("environment variable " + env + " not set")
+		}
+	}
+
+	return nil
+}
+
+// CheckDatabaseConnection checks if the database is up and running and
+// plugin can talk to it
+func CheckDatabaseConnection() error {
+	err := db.CreateDBClient(os.Getenv("DATABASE_TYPE"))
+	if err != nil {
+		return pkgerrors.Cause(err)
+	}
+
+	err = db.DBconn.InitializeDatabase()
+	if err != nil {
+		return pkgerrors.Cause(err)
+	}
+
+	err = db.DBconn.CheckDatabase()
+	if err != nil {
+		return pkgerrors.Cause(err)
+	}
+	return nil
+}
+
+// LoadPlugins loads all the compiled .so plugins
+func LoadPlugins() error {
+	pluginsDir, ok := os.LookupEnv("PLUGINS_DIR")
+	if !ok {
+		pluginsDir, _ = filepath.Abs(filepath.Dir(os.Args[0]))
+	}
+	err := filepath.Walk(pluginsDir,
+		func(path string, info os.FileInfo, err error) error {
+			if strings.Contains(path, ".so") {
+				p, err := plugin.Open(path)
+				if err != nil {
+					return pkgerrors.Cause(err)
+				}
+
+				krd.LoadedPlugins[info.Name()[:len(info.Name())-3]] = p
+			}
+			return err
+		})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// CheckInitialSettings is used to check initial settings required to start api
+func CheckInitialSettings() error {
+	err := CheckEnvVariables()
+	if err != nil {
+		return pkgerrors.Cause(err)
+	}
+
+	err = CheckDatabaseConnection()
+	if err != nil {
+		return pkgerrors.Cause(err)
+	}
+
+	err = LoadPlugins()
+	if err != nil {
+		return pkgerrors.Cause(err)
+	}
+
+	return nil
+}
+
+// NewRouter creates a router instance that serves the VNFInstance web methods
+func NewRouter(kubeconfig string) *mux.Router {
+	router := mux.NewRouter()
+
+	vnfInstanceHandler := router.PathPrefix("/v1/vnf_instances").Subrouter()
+	vnfInstanceHandler.HandleFunc("/", CreateHandler).Methods("POST").Name("VNFCreation")
+	vnfInstanceHandler.HandleFunc("/{cloudRegionID}/{namespace}", ListHandler).Methods("GET")
+	vnfInstanceHandler.HandleFunc("/{cloudRegionID}/{namespace}/{externalVNFID}", DeleteHandler).Methods("DELETE")
+	vnfInstanceHandler.HandleFunc("/{cloudRegionID}/{namespace}/{externalVNFID}", GetHandler).Methods("GET")
+
+	// (TODO): Fix update method
+	// vnfInstanceHandler.HandleFunc("/{vnfInstanceId}", UpdateHandler).Methods("PUT")
+
+	return router
+}