allowing to set the number of stream workers

Signed-off-by: alanprot <[email protected]>

server/server.go

@@ -101,6 +101,7 @@ type Config struct {
 	GPRCServerMaxRecvMsgSize           int           `yaml:"grpc_server_max_recv_msg_size"`
 	GRPCServerMaxSendMsgSize           int           `yaml:"grpc_server_max_send_msg_size"`
 	GPRCServerMaxConcurrentStreams     uint          `yaml:"grpc_server_max_concurrent_streams"`
+	GPRCServerNumStreamWorkers         uint          `yaml:"grpc_server_num_stream_workers"`
 	GRPCServerMaxConnectionIdle        time.Duration `yaml:"grpc_server_max_connection_idle"`
 	GRPCServerMaxConnectionAge         time.Duration `yaml:"grpc_server_max_connection_age"`
 	GRPCServerMaxConnectionAgeGrace    time.Duration `yaml:"grpc_server_max_connection_age_grace"`
@@ -159,6 +160,7 @@ func (cfg *Config) RegisterFlags(f *flag.FlagSet) {
 	f.IntVar(&cfg.GPRCServerMaxRecvMsgSize, "server.grpc-max-recv-msg-size-bytes", 4*1024*1024, "Limit on the size of a gRPC message this server can receive (bytes).")
 	f.IntVar(&cfg.GRPCServerMaxSendMsgSize, "server.grpc-max-send-msg-size-bytes", 4*1024*1024, "Limit on the size of a gRPC message this server can send (bytes).")
 	f.UintVar(&cfg.GPRCServerMaxConcurrentStreams, "server.grpc-max-concurrent-streams", 100, "Limit on the number of concurrent streams for gRPC calls (0 = unlimited)")
+	f.UintVar(&cfg.GPRCServerNumStreamWorkers, "server.grpc_server-num-stream-workers", 0, "Number of worker goroutines that should be used to process incoming streams.Setting this 0 (default) will disable workers and spawn a new goroutine for each stream.")
 	f.DurationVar(&cfg.GRPCServerMaxConnectionIdle, "server.grpc.keepalive.max-connection-idle", infinty, "The duration after which an idle connection should be closed. Default: infinity")
 	f.DurationVar(&cfg.GRPCServerMaxConnectionAge, "server.grpc.keepalive.max-connection-age", infinty, "The duration for the maximum amount of time a connection may exist before it will be closed. Default: infinity")
 	f.DurationVar(&cfg.GRPCServerMaxConnectionAgeGrace, "server.grpc.keepalive.max-connection-age-grace", infinty, "An additive period after max-connection-age after which the connection will be forcibly closed. Default: infinity")
@@ -354,6 +356,7 @@ func newServer(cfg Config, metrics *Metrics) (*Server, error) {
 	grpcOptions := []grpc.ServerOption{
 		grpc.ChainUnaryInterceptor(grpcMiddleware...),
 		grpc.ChainStreamInterceptor(grpcStreamMiddleware...),
+		grpc.NumStreamWorkers(uint32(cfg.GPRCServerNumStreamWorkers)),
 		grpc.KeepaliveParams(grpcKeepAliveOptions),
 		grpc.KeepaliveEnforcementPolicy(grpcKeepAliveEnforcementPolicy),
 		grpc.MaxRecvMsgSize(cfg.GPRCServerMaxRecvMsgSize),