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Contents
require "coach/errors"
module Coach
class MiddlewareValidator
def initialize(middleware, already_provided = [])
@middleware = middleware
@already_provided = already_provided
end
# Aggregates provided keys from the given middleware, and all the middleware it uses.
# Can raise at any level assuming a used middleware is missing a required dependency.
def validated_provides!
if missing_requirements.any?
raise Coach::Errors::MiddlewareDependencyNotMet.new(
@middleware, missing_requirements
)
end
@middleware.provided + provided_by_chain
end
private
def missing_requirements
@middleware.requirements - provided_by_chain
end
def provided_by_chain
@provided_by_chain ||=
middleware_dependencies.reduce(@already_provided) do |provided, middleware|
provided + self.class.new(middleware, provided).validated_provides!
end.flatten.uniq
end
def middleware_dependencies
@middleware_dependencies ||= @middleware.middleware_dependencies.map(&:middleware)
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems