mirror of
https://github.com/inspec/inspec
synced 2024-09-20 22:41:55 +00:00
93 lines
2.8 KiB
Ruby
93 lines
2.8 KiB
Ruby
# encoding: utf-8
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# author: Dominik Richter
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# author: Christoph Hartmann
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class PluginRegistry
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attr_reader :registry
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def initialize
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@registry = {}
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end
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# Resolve a target via available plugins.
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#
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# @param [String] target to resolve
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# @return [Plugin] plugin instance if it can be resolved, nil otherwise
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def resolve(target)
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modules.each do |m|
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res = m.resolve(target)
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return res unless res.nil?
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end
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nil
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end
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private
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# Get all registered plugins sorted by priority, with highest first
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#
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# @return [Array[Plugin]] sorted list of plugins
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def modules
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@registry.values
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.sort_by { |x| x.respond_to?(:priority) ? x.priority : 0 }
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.reverse
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end
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end
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class PluginRegistry
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class Plugin
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# Retrieve the plugin registry associated with this plugin
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#
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# @return [PluginRegistry] plugin registry for this plugin
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def self.plugin_registry
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raise "Plugin #{self} does not implement `self.plugin_registry()`. This method is required"
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end
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# Register a new plugin by name
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#
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# @param [String] the unique name of this plugin
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# @return [nil] disregard
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def self.name(name)
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raise "Trying to register #{self} with name == nil" if name.nil?
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@name = name
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plugin_registry.registry[name] = self
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end
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# This plugin's priority. Set it by providing the priority as an
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# argument. Higher numbers ensure that the plugin is
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# called early to check if a target belongs to it. When called without
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# an argument, it retrieves this plugin's priority. Defaults to 0.
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#
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# @param [Numeric] Priority as a number. Will only be set if != nil
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# @return [Numeric] This plugin's priority
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def self.priority(x = nil)
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@priority = x unless x.nil?
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@priority || 0
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end
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# Try to resolve the target. If this plugin cannot handle it, the result
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# will be nil. If, however, the plugin can resolve it, the resulting
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# object will be an instance of this plugin. This means, that the interface
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# that this base class provides, is the basis for the returned type.
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#
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# @param [String] target to try to resolve
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# @return [Plugin] instance if it can be resolved, nil otherwise
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def self.resolve(_target)
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raise "Plugin #{self} does not implement `self.resolve(target)`. This method is required"
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end
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# When a plugin's resolve doesn't lead to the final state, it can
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# use this method to hand it back for another resolver to handle.
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#
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# @param [Any] the current target that needs resolving
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# @param [Plugin] an instance of the calling resolver
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# @return [Plugin] instance if it can be resolved, nil otherwise
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def self.resolve_next(target, parent)
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res = plugin_registry.resolve(target)
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res.parent = parent
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res
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end
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attr_reader :target
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attr_accessor :parent
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end
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end
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