Class: Skein::Handler

Inherits:
Object
  • Object
show all
Defined in:
lib/skein/handler.rb

Direct Known Subclasses

Async, Threaded

Defined Under Namespace

Classes: Async, Threaded

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(target, context = nil) ⇒ Handler

Instance Methods =====================================================



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# File 'lib/skein/handler.rb', line 19

def initialize(target, context = nil)
  @target = target
  @context = context
end

Instance Attribute Details

#context ⇒ Object (readonly)

Properties ===========================================================



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# File 'lib/skein/handler.rb', line 4

def context
  @context
end

Class Method Details

.for(target) ⇒ Object

Class Methods ========================================================



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# File 'lib/skein/handler.rb', line 8

def self.for(target)
  case (target.respond_to?(:async?) and target.async?)
  when true
    Skein::Handler::Async.new(target)
  else
    Skein::Handler::Threaded.new(target)
  end
end

Instance Method Details

#handle(message_json) ⇒ Object 



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# File 'lib/skein/handler.rb', line 24

def handle(message_json)
  request =
    begin
      JSON.load(message_json)

    rescue Object => e
      @context and @context.exception!(e, message_json)

      return yield(JSON.dump(
        result: nil,
        error: '[%s] %s' % [ e.class, e ],
        id: nil
      ))
    end

  case (request)
  when Hash
    # Acceptable
  else
    return yield(JSON.dump(
      result: nil,
      error: 'Request does not conform to the JSON-RPC format.',
      id: nil
    ))
  end

  request['params'] =
    case (params = request['params'])
    when Array
      params
    when nil
      request.key?('params') ? [ nil ] : [ ]
    else
      [ request['params'] ]
    end

  unless (request['method'] and request['method'].is_a?(String) and request['method'].match(/\S/))
    return yield(JSON.dump(
      result: nil,
      error: 'Request does not conform to the JSON-RPC format, missing valid method.',
      id: request['id']
    ))
  end

  begin
    delegate(request['method'], *request['params']) do |result, error = nil|
      yield(JSON.dump(
        result: result,
        error: error,
        id: request['id']
      ))
    end
  rescue Object => e
    @context and @context.exception!(e, message_json)

    yield(JSON.dump(
      result: nil,
      error: '[%s] %s' % [ e.class, e ],
      id: request['id']
    ))
  end
end