Update gRPC to not repeatedly make new connections

globals/globals.go

@@ -1,9 +1,15 @@
 package globals
 
 import (
+	pb "github.com/PretendoNetwork/grpc-go/friends"
 	"github.com/PretendoNetwork/nex-go"
 	"github.com/PretendoNetwork/plogger-go"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/metadata"
 )
 
 var Logger = plogger.NewLogger()
 var NEXServer *nex.Server
+var GRPCFriendsClientConnection *grpc.ClientConn
+var GRPCFriendsClient pb.FriendsClient
+var GRPCFriendsCommonMetadata metadata.MD

grpc/send_incoming_call_notification.go

@@ -5,34 +5,18 @@ import (
 	"context"
 	"encoding/binary"
 	"log"
-	"os"
 
 	pb "github.com/PretendoNetwork/grpc-go/friends"
 	nex "github.com/PretendoNetwork/nex-go"
 	friends_wiiu_types "github.com/PretendoNetwork/nex-protocols-go/friends-wiiu/types"
 	nintendo_notifications "github.com/PretendoNetwork/nex-protocols-go/nintendo-notifications"
 	nintendo_notifications_types "github.com/PretendoNetwork/nex-protocols-go/nintendo-notifications/types"
 	"github.com/PretendoNetwork/wiiu-chat-secure/globals"
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/metadata"
 )
 
 func SendIncomingCallNotification(caller uint32, target uint32) {
-	// Connect to Friends gRPC.
-	conn, err := grpc.Dial(os.Getenv("FRIENDS_GRPC_ADDRESS"), grpc.WithTransportCredentials(insecure.NewCredentials()))
-	if err != nil {
-		log.Fatalf("Connection to Friends gRPC failed! : %v", err)
-	}
-
-	defer conn.Close()
-	c := pb.NewFriendsClient(conn)
-
-	md := metadata.Pairs(
-		"X-API-Key", os.Getenv("FRIENDS_GRPC_API_KEY"),
-	)
-
-	ctx := metadata.NewOutgoingContext(context.Background(), md)
+	ctx := metadata.NewOutgoingContext(context.Background(), globals.GRPCFriendsCommonMetadata)
 
 	presence := friends_wiiu_types.NewNintendoPresenceV2()
 
@@ -63,7 +47,7 @@ func SendIncomingCallNotification(caller uint32, target uint32) {
 	stream := nex.NewStreamOut(globals.NEXServer)
 	eventObjectBytes := eventObject.Bytes(stream)
 
-	_, err = c.SendUserNotificationWiiU(ctx, &pb.SendUserNotificationWiiURequest{Pid: target, NotificationData: eventObjectBytes})
+	_, err := globals.GRPCFriendsClient.SendUserNotificationWiiU(ctx, &pb.SendUserNotificationWiiURequest{Pid: target, NotificationData: eventObjectBytes})
 	if err != nil {
 		log.Fatalf("Greeting Friends gRPC failed! : %v", err)
 	}

init.go

@@ -1,9 +1,19 @@
 package main
 
 import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	pb "github.com/PretendoNetwork/grpc-go/friends"
 	"github.com/PretendoNetwork/plogger-go"
 	"github.com/PretendoNetwork/wiiu-chat-secure/database"
+	"github.com/PretendoNetwork/wiiu-chat-secure/globals"
 	"github.com/joho/godotenv"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/metadata"
 )
 
 var logger = plogger.NewLogger()
@@ -14,5 +24,42 @@ func init() {
 		logger.Warning("Error loading .env file")
 	}
 
+	friendsGRPCHost := os.Getenv("PN_WIIU_CHAT_FRIENDS_GRPC_HOST")
+	friendsGRPCPort := os.Getenv("PN_WIIU_CHAT_FRIENDS_GRPC_PORT")
+	friendsGRPCAPIKey := os.Getenv("PN_WIIU_CHAT_FRIENDS_GRPC_API_KEY")
+
+	if strings.TrimSpace(friendsGRPCHost) == "" {
+		globals.Logger.Error("PN_WIIU_CHAT_FRIENDS_GRPC_HOST environment variable not set")
+		os.Exit(0)
+	}
+
+	if strings.TrimSpace(friendsGRPCPort) == "" {
+		globals.Logger.Error("PN_WIIU_CHAT_FRIENDS_GRPC_PORT environment variable not set")
+		os.Exit(0)
+	}
+
+	if port, err := strconv.Atoi(friendsGRPCPort); err != nil {
+		globals.Logger.Errorf("PN_WIIU_CHAT_FRIENDS_GRPC_PORT is not a valid port. Expected 0-65535, got %s", friendsGRPCPort)
+		os.Exit(0)
+	} else if port < 0 || port > 65535 {
+		globals.Logger.Errorf("PN_WIIU_CHAT_FRIENDS_GRPC_PORT is not a valid port. Expected 0-65535, got %s", friendsGRPCPort)
+		os.Exit(0)
+	}
+
+	if strings.TrimSpace(friendsGRPCAPIKey) == "" {
+		globals.Logger.Warning("Insecure gRPC server detected. PN_WIIU_CHAT_FRIENDS_GRPC_API_KEY environment variable not set")
+	}
+
+	globals.GRPCFriendsClientConnection, err = grpc.Dial(fmt.Sprintf("%s:%s", friendsGRPCHost, friendsGRPCPort), grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		globals.Logger.Criticalf("Failed to connect to friends gRPC server: %v", err)
+		os.Exit(0)
+	}
+
+	globals.GRPCFriendsClient = pb.NewFriendsClient(globals.GRPCFriendsClientConnection)
+	globals.GRPCFriendsCommonMetadata = metadata.Pairs(
+		"X-API-Key", friendsGRPCAPIKey,
+	)
+
 	database.ConnectAll()
 }