Class: Arf::RPC::ClientBase

Inherits:
Object
  • Object
show all
Includes:
Types::Mixin
Defined in:
lib/arf/rpc/client_base.rb

Constant Summary

Constants included from Types::Mixin

Types::Mixin::ArrayType, Types::Mixin::InOutStream, Types::Mixin::InputStream, Types::Mixin::MapType, Types::Mixin::OutputStream, Types::Mixin::Streamer

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Types::Mixin

included

Constructor Details

#initialize(client) ⇒ ClientBase

Returns a new instance of ClientBase.



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# File 'lib/arf/rpc/client_base.rb', line 59

def initialize(client)
  @client = client
end

Class Method Details

.arf_service_id(id) ⇒ Object 



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# File 'lib/arf/rpc/client_base.rb', line 8

def self.arf_service_id(id)
  @arf_service_id = id
end

.rpc(name, inputs: nil, outputs: nil) ⇒ Object 



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# File 'lib/arf/rpc/client_base.rb', line 12

def self.rpc(name, inputs: nil, outputs: nil)
  @rpc_metadata ||= {}
  inputs ||= {}
  outputs = [outputs].compact unless outputs.is_a? Array

  @rpc_metadata[name] = {
    name:, inputs: inputs.dup, outputs: outputs.dup
  }

  inputs = inputs.to_a
    .map do |type|
      if type.last.is_a? InputStream
        outputs << type.last
        next nil
      end
      type
    end
    .compact.to_h

  if outputs.length > 1 && outputs[-2].is_a?(Streamer) && outputs[-1].is_a?(Streamer)
    input = outputs.find { _1.is_a? InputStream }
    output = outputs.find { _1.is_a? OutputStream }

    outputs = outputs[...-2]
    outputs << InOutStream[input.type, output.type]
  end

  @rpc_metadata[name][:native_inputs] = inputs
  @rpc_metadata[name][:native_outputs] = outputs

  internal_name = "_#{name}"
  service_name = @arf_service_id

  class_eval(<<~RUBY, __FILE__, __LINE__ + 1)
    # def name(param, param, param, **metadata, &block)
    #   internal_name(params, param, param, **metadata, &block)
    # end
    def #{name}(#{inputs.keys.join(", ")}#{inputs.length.positive? ? ", " : ""}**metadata, &block)
      #{internal_name}(#{inputs.keys.join(", ")}#{inputs.length.positive? ? ", " : ""}**metadata, &block)
    end
  RUBY

  define_method(internal_name) do |*args, **metadata, &block|
    _invoke_method(service_name, name, inputs.values, outputs, args, metadata, &block)
  end
end

Instance Method Details

#_invoke_method(service_id, method_name, inputs, outputs, args, meta) ⇒ Object 



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# File 'lib/arf/rpc/client_base.rb', line 63

def _invoke_method(service_id, method_name, inputs, outputs, args, meta)
  mapped_args = args.map.with_index do |v, idx|
    raw_type = case (t = inputs[idx])
               when Symbol then t
               when String then self.class.find_type(t)
               else
                 raise ArgumentError, "Unknown type definition #{v.inspect}"
               end

    Arf::Types.coerce_value(v, raw_type)
  end

  # Obtain a stream from @client
  str = @client.new_stream

  # Push the request
  streaming = outputs.any? { _1.is_a?(InputStream) || _1.is_a?(InOutStream) }
  req = Request.new(
    streaming:,
    metadata: meta,
    service: service_id,
    method: method_name,
    params: mapped_args
  )

  input_type = nil
  output_type = nil

  streamer = outputs.last
  case streamer
  when InputStream
    input_type = streamer.resolved_type(self.class)
  when OutputStream
    output_type = streamer.resolved_type(self.class)
  when InOutStream
    input_type = streamer.resolved_input(self.class)
    output_type = streamer.resolved_output(self.class)
  end

  resp = Responder.new(str, input_type, output_type)

  str.write_data(BaseMessage.encode(req), end_stream: !streaming)

  resp
end