Class: GRPC::OpenTracing::ClientInterceptor

Inherits:
Object
  • Object
show all
Defined in:
lib/grpc/opentracing/client_interceptor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tracer: ::OpenTracing.global_tracer, active_span: nil, decorators: [RequestReplySpanDecorator]) ⇒ ClientInterceptor

Returns a new instance of ClientInterceptor.



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# File 'lib/grpc/opentracing/client_interceptor.rb', line 6

def initialize(tracer: ::OpenTracing.global_tracer, active_span: nil, decorators: [RequestReplySpanDecorator])
  @tracer = tracer
  @active_span = active_span
  @decorators = decorators
end

Instance Attribute Details

#active_span ⇒ Object (readonly)

Returns the value of attribute active_span.



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# File 'lib/grpc/opentracing/client_interceptor.rb', line 4

def active_span
  @active_span
end

#decorators ⇒ Object (readonly)

Returns the value of attribute decorators.



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# File 'lib/grpc/opentracing/client_interceptor.rb', line 4

def decorators
  @decorators
end

#tracer ⇒ Object (readonly)

Returns the value of attribute tracer.



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# File 'lib/grpc/opentracing/client_interceptor.rb', line 4

def tracer
  @tracer
end

Instance Method Details

#intercept(client) ⇒ Object 



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# File 'lib/grpc/opentracing/client_interceptor.rb', line 12

def intercept(client)
  client.instance_variable_set(:@tracer, tracer)
  client.instance_variable_set(:@active_span, active_span)
  client.instance_variable_set(:@decorators, decorators)

  client.instance_eval do
    class << self
      alias_method :request_response_without_instrumentation, :request_response
    end

    def active_span
      @active_span.respond_to?(:call) ? @active_span.call : @active_span
    end

    def request_response(method, req, marshal, unmarshal, metadata: {}, **fields)
      tags = {
        'component' => 'gRPC',
        'span.kind' => 'client',
        'grpc.method_type' => 'request_response',
        'grpc.headers' => MultiJson.dump(metadata)
      }
      current_span = @tracer.start_span(method, child_of: active_span, tags: tags)

      hpack_carrier = HPACKCarrier.new(metadata)
      @tracer.inject(current_span.context, ::OpenTracing::FORMAT_TEXT_MAP, hpack_carrier)

      response = request_response_without_instrumentation(method, req, marshal, unmarshal,
                                                          metadata: metadata, **fields)

      response
    rescue Exception => e
      if current_span
        current_span.set_tag('error', true)
        current_span.log(event: 'error', :'error.object' => e)
      end
      raise
    ensure
      if @decorators
        @decorators.each do |decorator|
          decorator.call(current_span, method, req, response, e)
        end
      end
      current_span.finish if current_span
    end
  end

  client
end