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Versions: 14
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Stored size: 1.39 KB
Contents
require "coach/errors"
module Coach
class MiddlewareValidator
def initialize(middleware, previous_middlewares = [], already_provided = [])
@middleware = middleware
@previous_middlewares = previous_middlewares.clone
@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, @previous_middlewares, missing_requirements
)
end
@middleware.provided + provided_by_chain
end
private
attr_reader :previous_middlewares
def missing_requirements
@middleware.requirements - provided_by_chain
end
def provided_by_chain
@provided_by_chain ||= begin
initial = [@already_provided, @previous_middlewares]
middleware_dependencies.reduce(initial) do |(provided, previous), middleware|
validator = self.class.new(middleware, previous, provided)
[provided + validator.validated_provides!, previous + [middleware]]
end.first.flatten.uniq
end
end
def middleware_dependencies
@middleware_dependencies ||= @middleware.middleware_dependencies.map(&:middleware)
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems