Module: XRay::NetHttp::HTTPInstanceInterceptor

Includes:
Facets::Helper
Defined in:
lib/aws-xray-sdk/facets/net_http.rb

Overview

Instance level interceptor to capture http requests as subsegments

Constant Summary

Constants included from Facets::Helper

Facets::Helper::TRACE_HEADER, Facets::Helper::TRACE_HEADER_PROXY

Instance Method Summary collapse

Methods included from Facets::Helper

#construct_header, #prep_header_str, #should_sample?

Instance Method Details

#ec2_metadata_request?(req) ⇒ Boolean

Instance Metadata Service provides endpoint 169.254.169.254 to provide EC2 metadata

Returns:

  • (Boolean) 


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# File 'lib/aws-xray-sdk/facets/net_http.rb', line 35

def ec2_metadata_request?(req)
  req.uri && req.uri.hostname == '169.254.169.254'
end

#initialize(*options) ⇒ Object 



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# File 'lib/aws-xray-sdk/facets/net_http.rb', line 19

def initialize(*options)
  super(*options)
end

#lambda_runtime_request? ⇒ Boolean

HTTP requests to AWS Lambda Ruby Runtime will have the address and port matching the value set in ENV

Returns:

  • (Boolean) 


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# File 'lib/aws-xray-sdk/facets/net_http.rb', line 25

def lambda_runtime_request?
  ENV['AWS_LAMBDA_RUNTIME_API'] == "#{address}:#{port}"
end

#request(req, body = nil, &block) ⇒ Object 



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# File 'lib/aws-xray-sdk/facets/net_http.rb', line 39

def request(req, body = nil, &block)
  # Do not trace requests to xray or aws lambda runtime or ec2 metadata endpoint
  if xray_sampling_request?(req) || lambda_runtime_request? || ec2_metadata_request?(req)
    return super
  end

  entity = XRay.recorder.current_entity
  capture = !(entity && entity.namespace && entity.namespace == 'aws'.freeze)
  if started? && capture && entity
    XRay.recorder.capture(address, namespace: 'remote') do |subsegment|
      protocol = use_ssl? ? 'https'.freeze : 'http'.freeze
      # avoid modifying original variable
      iport = port.nil? ? nil : %(:#{port})
      # do not capture query string
      path = req.path.split('?')[0] if req.path
      uri = %(#{protocol}://#{address}#{iport}#{path})
      req_meta = {
        url: uri,
        method: req.method
      }
      subsegment.merge_http_request request: req_meta
      req[TRACE_HEADER] = prep_header_str entity: subsegment
      begin
        res = super
        res_meta = {
          status: res.code.to_i,
          content_length: res.content_length
        }
        subsegment.merge_http_response response: res_meta
        res
      rescue Exception => e
        subsegment.add_exception exception: e
        raise e
      end
    end
  else
    super
  end
end

#xray_sampling_request?(req) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/aws-xray-sdk/facets/net_http.rb', line 29

def xray_sampling_request?(req)
  req.path && (req.path == ('/GetSamplingRules') || req.path == ('/SamplingTargets'))
end