grpcx

Ruby gRPC extensions/helpers

Grpcx::Server

Mixin for GRPC::RpcServer:

• handles GRPC health checks requests
• handles ActiveRecord connection (auto-connect + pooling)
• instruments each request with ActiveSupport::Notifications (available as process_action.grpc, includes service: 'package.name.ServiceName', action: 'underscored_action_name' data)
• includes ActiveSupport::Rescuable and transforms most common ActiveRecord::ActiveRecordError-s into GRPC::BadStatus ones

Example:

require 'grpcx/server' # or just 'grpcx'

class MyServer < GRPC::RpcServer
  include Grpcx::Server

  # optional custom error handling:
  rescue_from 'MyError' do |e|
    raise Grpc::BadStatus.new(e.to_s, my_extra: e.my_extra)
  end
end

# proceed as with usual GRPC::RpcServer:
server = MyServer.new(...)
server.handle(MyService.new)
server.add_http2_port '127.0.0.1:8080', :this_port_is_insecure
server.run_till_terminated

Recommended to be used with Grpclb::Server:

require 'grpclb/server'
require 'grpcx/server'

class MyServer < Grpclb::Server
  include Grpcx::Server
end

...

Using with Datadog::Notifications

Since version >= 0.5.4

Datadog::Notifications.configure do |c|
  c.use Datadog::Notifications::Plugins::GRPC
end if RUNNING_IN_PROD?

Using with Sentry/Raven

ActiveSupport::Notifications.subscribe(Grpcx::Server::Interceptors::Instrumentation::METRIC_NAME) do |_name, _start, _finish, _id, payload|
  e = payload[:exception_object]
  next unless e

  Raven.capture_exception(e, extra: {
    'service' => payload[:service],
    'action'  => payload[:action],
  })
end

Raven.configure do |config|
  config.should_capture = proc {|e|
    !e.is_a?(GRPC::BadStatus) # skip GRPC::BadStatus, but report everything else
  }
end

Similar approach can be used for logging.