samples/grpc_middleware_service/main.cpp

Config override

To a middleware config per service or client (like overriding enabled option).

Example.

grpc-server-meta-filter:
    headers:
      - global-header
grpc-server-middlewares-pipeline:
    middlewares:
        grpc-server-meta-filter:  # register the middleware in the pipeline
            enabled: true
some-service:
    middlewares:
        grpc-server-meta-filter:
            # The middleware of this service will get this header instead of 'global-header'
            headers:
              - specific-header

Note

Imagine there are more options but you override only headers. Values of other options will be taken from a global config (from grpc-server-middlewares-pipeline)

⇦ gRPC middlewares order | RabbitMQ (AMQP 0-9-1) ⇨

#include <userver/utest/using_namespace_userver.hpp>
 
#include <userver/components/minimal_server_component_list.hpp>
#include <userver/congestion_control/component.hpp>
#include <userver/testsuite/testsuite_support.hpp>
#include <userver/ugrpc/client/component_list.hpp>
#include <userver/ugrpc/server/component_list.hpp>
#include <userver/utils/daemon_run.hpp>
 
#include <client/view.hpp>
#include <http_handlers/say-hello/view.hpp>
#include <middlewares/client/auth.hpp>
#include <middlewares/client/chaos.hpp>
#include <middlewares/server/auth.hpp>
#include <middlewares/server/meta_filter.hpp>
#include <service/view.hpp>

int main(int argc, char* argv[]) {
    const auto component_list = components::MinimalServerComponentList()
                                    .AppendComponentList(ugrpc::server::DefaultComponentList())
                                    .AppendComponentList(ugrpc::client::MinimalComponentList())
                                    .Append<ugrpc::client::ClientFactoryComponent>()
                                    .Append<components::TestsuiteSupport>()
                                    .Append<congestion_control::Component>()
                                    .Append<samples::grpc::auth::GreeterClient>()
                                    .Append<samples::grpc::auth::GreeterServiceComponent>()
                                    .Append<samples::grpc::auth::GreeterHttpHandler>()
                                    .Append<sample::grpc::auth::server::AuthComponent>()
                                    .Append<sample::grpc::auth::server::MetaFilterComponent>()
                                    .Append<sample::grpc::auth::client::AuthComponent>()
                                    .Append<sample::grpc::auth::client::ChaosComponent>()
 
        ;
 
    return utils::DaemonMain(argc, argv, component_list);
}