Class: Itsi::Server::GrpcInterface

Inherits:
Object
  • Object
show all
Defined in:
lib/itsi/server/grpc/grpc_interface.rb

Constant Summary collapse

DeadlineExceeded = 
Class.new(StandardError)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(service) ⇒ GrpcInterface

Returns a new instance of GrpcInterface.



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# File 'lib/itsi/server/grpc/grpc_interface.rb', line 23

def initialize(service)
  @service = service
  @service_class = service.class
  @rpc_descs = @service_class.rpc_descs.transform_keys do |k|
    k.to_s.gsub(/([a-z])([A-Z])/, "\\1_\\2").downcase.to_sym
  end
end

Instance Attribute Details

#service ⇒ Object

Returns the value of attribute service.



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# File 'lib/itsi/server/grpc/grpc_interface.rb', line 6

def service
  @service
end

#service_class ⇒ Object

Returns the value of attribute service_class.



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# File 'lib/itsi/server/grpc/grpc_interface.rb', line 6

def service_class
  @service_class
end

Class Method Details

.for(service) ⇒ Object 



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# File 'lib/itsi/server/grpc/grpc_interface.rb', line 8

def self.for(service)
  interface = new(service)
  lambda do |request|
    interface.handle_request(request)
  end
end

.reflection_for(handlers) ⇒ Object 



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# File 'lib/itsi/server/grpc/grpc_interface.rb', line 15

def self.reflection_for(handlers)
  require_relative "reflection/v1/reflection_services_pb"
  interface = new(Grpc::Reflection::V1::ServerReflection::Service.new(handlers))
  lambda do |request|
    interface.handle_request(request)
  end
end

Instance Method Details

#handle_request(active_call) ⇒ Object 



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# File 'lib/itsi/server/grpc/grpc_interface.rb', line 31

def handle_request(active_call)
  unless (active_call.rpc_desc = @rpc_descs[active_call.method_name])
    active_call.stream.write("\n")
    active_call.send_status(13, "Method not found")
    active_call.close
    return
  end

  active_call.send_initial_metadata(
    {
      "grpc-accept-encoding" => "gzip, deflate, identity",
      "content-type" => active_call.json? ? "application/json" : "application/grpc"
    }
  )

  begin
    if active_call.bidi_streamer?
      handle_bidi_streaming(active_call)
    elsif active_call.client_streamer?
      handle_client_streaming(active_call)
    elsif active_call.server_streamer?
      handle_server_streaming(active_call)
    elsif active_call.request_response?
      handle_unary(active_call)
    end
    active_call.send_status(0, "Success")
  rescue Google::Protobuf::ParseError => e
    active_call.send_empty
    active_call.send_status(3, e.message)
  rescue DeadlineExceeded => e
    active_call.send_empty
    active_call.send_status(4, e.message)
  rescue StandardError => e
    active_call.send_empty
    active_call.send_status(13, e.message)
  end
rescue StandardError => e
  Itsi.log_warn("Unhandled error in grpc_interface: #{e.message}")
ensure
  active_call.close
end