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# encoding: UTF-8
require 'hashie'
module GoodData
module Bricks
class Middleware
attr_accessor :app
include Bricks::Utils
# Loads defaults to params from a json file in @config.
#
# The idea is to have a set of parameter defaults
# for a middleware. The defaults are loaded from a json file.
# If a brick user wants to override a default, they can
# do that in runtime params which come to the method in 'params'.
#
# A deep merge is done on the params. Arrays and other
# non-hash types are overwritten (params win).
#
# ### Examples
#
# A brick developer develops a SalesforceDownloaderMiddleware
# with default preset 'gse' having a configuration preset
# {"entities": ["Acount", "Event", "OpportunityLineItem", "Opportunity", "User"]}
#
# The brick user only wants to use Opportunity, so he passes
# runtime parameter {"entities": ["Opportunity"]} which overrides
# the default.
# See spec/bricks/bricks_spec.rb for usage.
def load_defaults(params)
# if default params given, fill what's not given in runtime params
if @config
# load it from file and merge it
defaults = { 'config' => MultiJson.load(File.read(@config)) }
default_params = defaults.extend(Hashie::Extensions::DeepMerge)
params = default_params.deep_merge(params)
end
params
end
def call(params)
load_defaults(params)
end
def initialize(options = {})
@app = options[:app]
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems