add keepalive settings to grpc server (#23)

Makefile

@@ -11,6 +11,8 @@ testChart:
 	helm template ./chart/envoy-control-plane | kubectl apply --dry-run=client --validate -f -
 build:
 	docker build . -t paskalmaksim/envoy-control-plane:dev
+build-envoy:
+	docker-compose build envoy-test1
 buildEnvoy:
 	docker build ./envoy -t paskalmaksim/envoy-docker-image:dev
 build-cli:

cmd/main/main.go

@@ -24,13 +24,17 @@ import (
 	logrushooksentry "github.com/maksim-paskal/logrus-hook-sentry"
 	log "github.com/sirupsen/logrus"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/keepalive"
 	"gopkg.in/yaml.v3"
 	v1 "k8s.io/api/core/v1"
 )
 
 var gitVersion = "dev"
 
 const (
+	grpcKeepaliveTime        = 30 * time.Second
+	grpcKeepaliveTimeout     = 5 * time.Second
+	grpcKeepaliveMinTime     = 30 * time.Second
 	grpcMaxConcurrentStreams = 1000000
 )
 
@@ -176,7 +180,17 @@ func main() {
 
 	ctx := context.Background()
 	grpcOptions := []grpc.ServerOption{}
-	grpcOptions = append(grpcOptions, grpc.MaxConcurrentStreams(grpcMaxConcurrentStreams))
+	grpcOptions = append(grpcOptions,
+		grpc.MaxConcurrentStreams(grpcMaxConcurrentStreams),
+		grpc.KeepaliveParams(keepalive.ServerParameters{
+			Time:    grpcKeepaliveTime,
+			Timeout: grpcKeepaliveTimeout,
+		}),
+		grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
+			MinTime:             grpcKeepaliveMinTime,
+			PermitWithoutStream: true,
+		}),
+	)
 	grpcServer := grpc.NewServer(grpcOptions...)
 
 	defer grpcServer.GracefulStop()

docker-compose.yml

@@ -6,6 +6,7 @@ services:
     volumes:
     - .:/app
     environment:
+    #- GODEBUG=http2debug=2
     - MY_POD_NAMESPACE=default
     ports:
     - 18081:18081