Initial QSfera import

Server/pkg/service/grpc/keepalive.go

@@ -0,0 +1,24 @@
+package grpc
+
+import (
+	"math"
+	"os"
+	"time"
+)
+
+const (
+	_serverMaxConnectionAgeEnv = "GRPC_MAX_CONNECTION_AGE"
+
+	// same default as grpc
+	infinity                 = time.Duration(math.MaxInt64)
+	_defaultMaxConnectionAge = infinity
+)
+
+// GetMaxConnectionAge returns the maximum grpc connection age.
+func GetMaxConnectionAge() time.Duration {
+	d, err := time.ParseDuration(os.Getenv(_serverMaxConnectionAgeEnv))
+	if err != nil {
+		return _defaultMaxConnectionAge
+	}
+	return d
+}