Add gRPC servers to ncm service

Add a contextupdate grpc server to the ncm service.

Issue-ID: MULTICLOUD-1029
Signed-off-by: Eric Multanen <eric.w.multanen@intel.com>
Change-Id: I38caa625c028baac06a6202f03b86d0f2bf38126

4 files changed, 162 insertions, 1 deletions

diff --git a/src/ncm/cmd/main.go b/src/ncm/cmd/main.go
index c4ae423f..49af81ee 100644
--- a/src/ncm/cmd/main.go
+++ b/src/ncm/cmd/main.go
@@ -15,23 +15,73 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"log"
 	"math/rand"
+	"net"
 	"net/http"
 	"os"
 	"os/signal"
+	"strings"
 	"time"
 
 	"github.com/gorilla/handlers"
 	"github.com/onap/multicloud-k8s/src/ncm/api"
+	register "github.com/onap/multicloud-k8s/src/ncm/pkg/grpc"
+	"github.com/onap/multicloud-k8s/src/ncm/pkg/grpc/contextupdateserver"
+	updatepb "github.com/onap/multicloud-k8s/src/orchestrator/pkg/grpc/contextupdate"
 	"github.com/onap/multicloud-k8s/src/orchestrator/pkg/infra/auth"
 	"github.com/onap/multicloud-k8s/src/orchestrator/pkg/infra/config"
 	contextDb "github.com/onap/multicloud-k8s/src/orchestrator/pkg/infra/contextdb"
 	"github.com/onap/multicloud-k8s/src/orchestrator/pkg/infra/db"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/testdata"
 )
 
-func main() {
+func startGrpcServer() error {
+	var tls bool
+
+	if strings.Contains(config.GetConfiguration().GrpcEnableTLS, "enable") {
+		tls = true
+	} else {
+		tls = false
+	}
+	certFile := config.GetConfiguration().GrpcServerCert
+	keyFile := config.GetConfiguration().GrpcServerKey
+
+	host, port := register.GetServerHostPort()
+
+	lis, err := net.Listen("tcp", fmt.Sprintf("%s:%d", host, port))
+	if err != nil {
+		log.Fatalf("Could not listen to port: %v", err)
+	}
+	var opts []grpc.ServerOption
+	if tls {
+		if certFile == "" {
+			certFile = testdata.Path("server.pem")
+		}
+		if keyFile == "" {
+			keyFile = testdata.Path("server.key")
+		}
+		creds, err := credentials.NewServerTLSFromFile(certFile, keyFile)
+		if err != nil {
+			log.Fatalf("Could not generate credentials %v", err)
+		}
+		opts = []grpc.ServerOption{grpc.Creds(creds)}
+	}
+	grpcServer := grpc.NewServer(opts...)
+	updatepb.RegisterContextupdateServer(grpcServer, contextupdateserver.NewContextupdateServer())
 
+	log.Println("Starting Network Configuration Manager gRPC Server")
+	err = grpcServer.Serve(lis)
+	if err != nil {
+		log.Fatalf("ncm grpc server is not serving %v", err)
+	}
+	return err
+}
+
+func main() {
 	rand.Seed(time.Now().UnixNano())
 
 	err := db.InitializeDatabaseConnection("mco")
@@ -56,6 +106,13 @@ func main() {
 		Addr:    ":" + config.GetConfiguration().ServicePort,
 	}
 
+	go func() {
+		err := startGrpcServer()
+		if err != nil {
+			log.Fatalf("GRPC server failed to start")
+		}
+	}()
+
 	connectionsClose := make(chan struct{})
 	go func() {
 		c := make(chan os.Signal, 1)
diff --git a/src/ncm/go.mod b/src/ncm/go.mod
index 8b45298f..19f83bdf 100644
--- a/src/ncm/go.mod
+++ b/src/ncm/go.mod
@@ -13,6 +13,7 @@ require (
 	go.etcd.io/etcd v3.3.12+incompatible
 	go.mongodb.org/mongo-driver v1.0.0
 	golang.org/x/net v0.0.0-20190930134127-c5a3c61f89f3
+	google.golang.org/grpc v1.27.1
 	gopkg.in/yaml.v2 v2.2.8
 	k8s.io/api v0.0.0-20190831074750-7364b6bdad65
 	k8s.io/apimachinery v0.0.0-20190831074630-461753078381
diff --git a/src/ncm/pkg/grpc/contextupdateserver/contextupdateserver.go b/src/ncm/pkg/grpc/contextupdateserver/contextupdateserver.go
new file mode 100644
index 00000000..fc548ccc
--- /dev/null
+++ b/src/ncm/pkg/grpc/contextupdateserver/contextupdateserver.go
@@ -0,0 +1,45 @@
+/*
+Copyright 2020 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 contextupdateserver
+
+import (
+	"context"
+	"encoding/json"
+	"log"
+
+	contextpb "github.com/onap/multicloud-k8s/src/orchestrator/pkg/grpc/contextupdate"
+	//"google.golang.org/grpc/codes"
+	//"google.golang.org/grpc/status"
+)
+
+type contextupdateServer struct {
+	contextpb.UnimplementedContextupdateServer
+}
+
+func (cs *contextupdateServer) UpdateAppContext(ctx context.Context, req *contextpb.ContextUpdateRequest) (*contextpb.ContextUpdateResponse, error) {
+	contextUpdateReq, _ := json.Marshal(req)
+	log.Println("GRPC Server received contextupdateRequest: ", string(contextUpdateReq))
+
+	// Insert call to Server Functionality here
+	//
+	//
+
+	return &contextpb.ContextUpdateResponse{AppContextUpdated: true}, nil
+}
+
+// NewContextUpdateServer exported
+func NewContextupdateServer() *contextupdateServer {
+	s := &contextupdateServer{}
+	return s
+}
diff --git a/src/ncm/pkg/grpc/register.go b/src/ncm/pkg/grpc/register.go
new file mode 100644
index 00000000..07d8f5c0
--- /dev/null
+++ b/src/ncm/pkg/grpc/register.go
@@ -0,0 +1,58 @@
+/*
+Copyright 2020 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 grpc
+
+import (
+	"os"
+	"strconv"
+	"strings"
+
+	log "github.com/onap/multicloud-k8s/src/orchestrator/pkg/infra/logutils"
+)
+
+const default_host = "localhost"
+const default_port = 9030
+const default_ncm_name = "ncm"
+const ENV_NCM_NAME = "NCM_NAME"
+
+func GetServerHostPort() (string, int) {
+
+	// expect name of this ncm program to be in env variable "NCM_NAME" - e.g. NCM_NAME="ncm"
+	serviceName := os.Getenv(ENV_NCM_NAME)
+	if serviceName == "" {
+		serviceName = default_ncm_name
+		log.Info("Using default name for NCM service name", log.Fields{
+			"Name": serviceName,
+		})
+	}
+
+	// expect service name to be in env variable - e.g. NCM_SERVICE_HOST
+	host := os.Getenv(strings.ToUpper(serviceName) + "_SERVICE_HOST")
+	if host == "" {
+		host = default_host
+		log.Info("Using default host for ncm gRPC controller", log.Fields{
+			"Host": host,
+		})
+	}
+
+	// expect service port to be in env variable - e.g. NCM_SERVICE_PORT
+	port, err := strconv.Atoi(os.Getenv(strings.ToUpper(serviceName) + "_SERVICE_PORT"))
+	if err != nil || port < 0 {
+		port = default_port
+		log.Info("Using default port for ncm gRPC controller", log.Fields{
+			"Port": port,
+		})
+	}
+	return host, port
+}