Class: Academical::HttpClient::ErrorHandler

Inherits:
Faraday::Middleware
  • Object
show all
Defined in:
lib/academical/http_client/error_handler.rb

Overview

ErrorHanlder takes care of selecting the error message from response body

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ ErrorHandler

Returns a new instance of ErrorHandler.



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# File 'lib/academical/http_client/error_handler.rb', line 8

def initialize(app)
  super(app)
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/academical/http_client/error_handler.rb', line 12

def call(env)
  @app.call(env).on_complete do |env|
    code = env[:response].status
    type = env[:response].headers["content-type"]

    case code
    when 500...599
      raise Academical::Error::ClientError.new("Error #{code}", code)
    when 400...499
      body = Academical::HttpClient::ResponseHandler.get_body(env[:response])
      message = ""

      # If HTML, whole body is taken
      if body.is_a?(String)
        message = body
      end

      # If JSON, a particular field is taken and used
      if type.include?("json") and body.is_a?(Hash)
        if body.has_key?("message")
          message = body["message"]
        else
          message = "Unable to select error message from json returned by request responsible for error"
        end
      end

      if message == ""
        message = "Unable to understand the content type of response returned by request responsible for error"
      end

      raise Academical::Error::ClientError.new message, code
    end
  end
end