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b8762172e4
This patch introduces a new `ServiceJob` class allowing the use of `with_service` in jobs. This way, it’s easier to use the chat service objects in jobs and provides the same level of functionality than the one we have in controllers.
117 lines
3.7 KiB
Ruby
117 lines
3.7 KiB
Ruby
# frozen_string_literal: true
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#
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# = Chat::ServiceRunner
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#
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# This class is to be used via its helper +with_service+ in any class. Its
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# main purpose is to ease how actions can be run upon a service completion.
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# Since a service will likely return the same kind of things over and over,
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# this allows us to not have to repeat the same boilerplate code in every
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# object.
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#
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# There are several available actions and we can add new ones very easily:
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#
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# * +on_success+: will execute the provided block if the service succeeds
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# * +on_failure+: will execute the provided block if the service fails
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# * +on_failed_policy(name)+: will execute the provided block if the policy
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# named `name` fails
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# * +on_failed_contract(name)+: will execute the provided block if the contract
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# named `name` fails
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# * +on_model_not_found(name)+: will execute the provided block if the service
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# fails and its model is not present
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#
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# @example In a controller
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# def create
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# with_service MyService do
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# on_success do
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# flash[:notice] = "Success!"
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# redirect_to a_path
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# end
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# on_failed_policy(:a_named_policy) { redirect_to root_path }
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# on_failure { render :new }
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# end
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# end
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#
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# @example In a job (inheriting from +ServiceJob+)
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# def execute(args = {})
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# with_service(MyService, **args) do
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# on_success { Rails.logger.info "SUCCESS" }
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# on_failure { Rails.logger.error "FAILURE" }
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# end
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# end
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#
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# The actions will be evaluated in the order they appear. So even if the
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# service will ultimately fail with a failed policy, in this example only the
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# +on_failed_policy+ action will be executed and not the +on_failure+ one.
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# The only exception to this being +on_failure+ as it will always be executed
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# last.
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#
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class Chat::ServiceRunner
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# @!visibility private
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NULL_RESULT = OpenStruct.new(failure?: false)
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# @!visibility private
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AVAILABLE_ACTIONS = {
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on_success: -> { result.success? },
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on_failure: -> { result.failure? },
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on_failed_policy: ->(name = "default") { failure_for?("result.policy.#{name}") },
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on_failed_contract: ->(name = "default") { failure_for?("result.contract.#{name}") },
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on_model_not_found: ->(name = "model") { failure_for?("result.model.#{name}") },
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}.with_indifferent_access.freeze
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# @!visibility private
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attr_reader :service, :object, :dependencies
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delegate :result, to: :object
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# @!visibility private
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def initialize(service, object, **dependencies)
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@service = service
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@object = object
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@dependencies = dependencies
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@actions = {}
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end
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# @param service [Class] a class including {Chat::Service::Base}
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# @param block [Proc] a block containing the steps to match on
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# @return [void]
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def self.call(service, object, **dependencies, &block)
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new(service, object, **dependencies).call(&block)
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end
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# @!visibility private
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def call(&block)
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instance_eval(&block)
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object.run_service(service, dependencies)
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# Always have `on_failure` as the last action
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(
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actions
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.except(:on_failure)
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.merge(actions.slice(:on_failure))
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.detect { |name, (condition, _)| condition.call } || [-> {}]
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).flatten.last.call
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end
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private
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attr_reader :actions
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def failure_for?(key)
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(object.result[key] || NULL_RESULT).failure?
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end
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def add_action(name, *args, &block)
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actions[[name, *args].join("_").to_sym] = [
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-> { instance_exec(*args, &AVAILABLE_ACTIONS[name]) },
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-> { object.instance_eval(&block) },
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]
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end
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def method_missing(method_name, *args, &block)
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return super unless AVAILABLE_ACTIONS[method_name]
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add_action(method_name, *args, &block)
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end
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def respond_to_missing?(method_name, include_private = false)
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AVAILABLE_ACTIONS[method_name] || super
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end
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end
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