add retry policy for grpc clients

MareSynchronosServer/MareSynchronosServer/Startup.cs

@@ -15,6 +15,7 @@ using AspNetCoreRateLimit;
 using MareSynchronosShared.Authentication;
 using MareSynchronosShared.Data;
 using MareSynchronosShared.Protos;
+using Grpc.Net.Client.Configuration;
 
 namespace MareSynchronosServer
 {
@@ -46,17 +47,38 @@ namespace MareSynchronosServer
 
             var mareConfig = Configuration.GetRequiredSection("MareSynchronos");
 
+            var defaultMethodConfig = new MethodConfig
+            {
+                Names = { MethodName.Default },
+                RetryPolicy = new RetryPolicy
+                {
+                    MaxAttempts = 100,
+                    InitialBackoff = TimeSpan.FromSeconds(1),
+                    MaxBackoff = TimeSpan.FromSeconds(5),
+                    BackoffMultiplier = 1.5,
+                }
+            };
+
             services.AddGrpcClient<AuthService.AuthServiceClient>(c =>
             {
                 c.Address = new Uri(mareConfig.GetValue<string>("ServiceAddress"));
+            }).ConfigureChannel(c =>
+            {
+                c.ServiceConfig = new ServiceConfig { MethodConfigs = { defaultMethodConfig } };
             });
             services.AddGrpcClient<MetricsService.MetricsServiceClient>(c =>
             {
                 c.Address = new Uri(mareConfig.GetValue<string>("ServiceAddress"));
+            }).ConfigureChannel(c =>
+            {
+                c.ServiceConfig = new ServiceConfig { MethodConfigs = { defaultMethodConfig } };
             });
             services.AddGrpcClient<FileService.FileServiceClient>(c =>
             {
                 c.Address = new Uri(mareConfig.GetValue<string>("StaticFileServiceAddress"));
+            }).ConfigureChannel(c =>
+            {
+                c.ServiceConfig = new ServiceConfig { MethodConfigs = { defaultMethodConfig } };
             });
 
             services.AddDbContextPool<MareDbContext>(options =>