Class: SparkApi::FaradayMiddleware

Inherits:
Faraday::Response::Middleware
  • Object
show all
Includes:
PaginateHelper
Defined in:
lib/spark_api/faraday_middleware.rb

Overview

Spark API Faraday middleware

HTTP Response after filter to package api responses and bubble up basic api errors.

Instance Method Summary collapse

Methods included from PaginateHelper

#paginate_response

Constructor Details

#initialize(app) ⇒ FaradayMiddleware

Returns a new instance of FaradayMiddleware.



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# File 'lib/spark_api/faraday_middleware.rb', line 11

def initialize(app)
  super(app)
end

Instance Method Details

#decompress_body(env) ⇒ Object 



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# File 'lib/spark_api/faraday_middleware.rb', line 70

def decompress_body(env)
  encoding = env[:response_headers]['content-encoding'].to_s.downcase

  if encoding == 'gzip'
    env[:body] = Zlib::GzipReader.new(StringIO.new(env[:body])).read
  elsif encoding == 'deflate'
    env[:body] = Zlib::Inflate.inflate(env[:body])
  end

  env[:body]
end

#on_complete(env) ⇒ Object

Handles pretty much all the api response parsing and error handling. All responses that indicate a failure will raise a SparkApi::ClientError exception



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# File 'lib/spark_api/faraday_middleware.rb', line 17

def on_complete(env)

  env[:body] = decompress_body(env)

  body = MultiJson.decode(env[:body])
  SparkApi.logger.debug("Response Body: #{body.inspect}")
  unless body.is_a?(Hash) && body.key?("D")
    raise InvalidResponse, "The server response could not be understood"
  end
  response = ApiResponse.new body
  paging = response.pagination
  if paging.nil?
    results = response
  else
    q = CGI.parse(env[:url].query)
    if q.key?("_pagination") && q["_pagination"].first == "count"
      results = paging['TotalRows']
    else
      results = paginate_response(response, paging)
    end
  end
  case env[:status]
  when 400
    hash = {:message => response.message, :code => response.code, :status => env[:status]}

    # constraint violation
    if response.code == 1053
      details = body['D']['Details']
      hash[:details] = details
    end
    raise BadResourceRequest,hash
  when 401
    # Handle the WWW-Authenticate Response Header Field if present. This can be returned by 
    # OAuth2 implementations and wouldn't hurt to log.
    auth_header_error = env[:request_headers]["WWW-Authenticate"]
    SparkApi.logger.warn("Authentication error #{auth_header_error}") unless auth_header_error.nil?
    raise PermissionDenied, {:message => response.message, :code => response.code, :status => env[:status]}
  when 404
    raise NotFound, {:message => response.message, :code => response.code, :status => env[:status]}
  when 405
    raise NotAllowed, {:message => response.message, :code => response.code, :status => env[:status]}
  when 409
    raise BadResourceRequest, {:message => response.message, :code => response.code, :status => env[:status]}
  when 500
    raise ClientError, {:message => response.message, :code => response.code, :status => env[:status]}
  when 200..299
    SparkApi.logger.debug("Success!")
  else 
    raise ClientError, {:message => response.message, :code => response.code, :status => env[:status]}
  end
  env[:body] = results
end