Class: EpsagonFaradayMiddleware

Inherits:
Faraday::Middleware
  • Object
show all
Defined in:
lib/instrumentation/epsagon_faraday_middleware.rb

Overview

Faraday middleware for epsagon instrumentaton

Constant Summary collapse

HTTP_METHODS_SYMBOL_TO_STRING = 
{
  connect: 'CONNECT',
  delete: 'DELETE',
  get: 'GET',
  head: 'HEAD',
  options: 'OPTIONS',
  patch: 'PATCH',
  post: 'POST',
  put: 'PUT',
  trace: 'TRACE'
}.freeze

Instance Method Summary collapse

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/instrumentation/epsagon_faraday_middleware.rb', line 26

def call(env)
  http_method = HTTP_METHODS_SYMBOL_TO_STRING[env.method]
  path, path_params = env.url.path.split(';')

  attributes = {
    'type' => 'http',
    'operation' => http_method,
    'http.scheme' => env.url.scheme,
    'http.request.path' => path
  }

  unless config[:epsagon][:metadata_only]
    attributes.merge!(Util.epsagon_query_attributes(env.url.query))
    attributes.merge!({
      'http.request.path_params' => path_params,
      'http.request.headers' => Hash[env.request_headers],
      'http.request.body' => env.body,
      'http.request.headers.User-Agent' => env.request_headers['User-Agent']
    })
  end

  tracer.in_span(
    env.url.host,
    attributes: attributes,
    kind: :client
  ) do |span|
    OpenTelemetry.propagation.http.inject(env.request_headers)

    app.call(env).on_complete { |req| trace_response(span, req.response) }
  end
end

#config ⇒ Object 



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# File 'lib/instrumentation/epsagon_faraday_middleware.rb', line 10

def config
  EpsagonFaradayInstrumentation.instance.config
end