Class: Norn::PluginManager

Inherits:
Object
  • Object
show all
Defined in:
lib/norn/plugin_manager.rb

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.active_plugins ⇒ Object

Returns the value of attribute active_plugins.



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# File 'lib/norn/plugin_manager.rb', line 14

def active_plugins
  @active_plugins
end

Class Method Details

.declare_hook(event, desc:) ⇒ Object

Phase 1: Declare a new lifecycle event or custom hook in the system



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# File 'lib/norn/plugin_manager.rb', line 45

def declare_hook(event, desc:)
  @lock.synchronize do
    @declared_hooks[event.to_sym] = desc
  end
end

.declared_hooks ⇒ Object 



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# File 'lib/norn/plugin_manager.rb', line 51

def declared_hooks
  @declared_hooks
end

.ensure_active_plugins! ⇒ Object 



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# File 'lib/norn/plugin_manager.rb', line 16

def ensure_active_plugins!
  return unless @active_plugins.empty? && Norn::Plugin.registered_plugins.any?

  # Guard against recursive instantiation on the same thread
  return if Thread.current[:norn_instantiating_plugins]

  @lock.synchronize do
    return unless @active_plugins.empty?
  end

  Thread.current[:norn_instantiating_plugins] = true
  begin
    plugins = Norn::Plugin.registered_plugins.map(&:new)
    @lock.synchronize do
      @active_plugins = plugins if @active_plugins.empty?
    end
  ensure
    Thread.current[:norn_instantiating_plugins] = false
  end
end

.register_core_hooks! ⇒ Object

Auto-wire declared standard Norn core hooks



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# File 'lib/norn/plugin_manager.rb', line 152

def register_core_hooks!
  declare_hook :on_boot, desc: "Fires when Norn finishes loading dependencies."
  declare_hook :on_tool_register, desc: "Fires to populate the global ToolRegistry."
  declare_hook :on_cli_register, desc: "Fires to let plugins register custom CLI commands."
  declare_hook :on_mode_register, desc: "Fires to register custom execution modes."
  declare_hook :on_slash_commands_register, desc: "Fires to let plugins register custom slash commands."
  declare_hook :on_user_input, desc: "ROP middleware. Intercepts and processes raw user input before execution."
  declare_hook :before_llm_call, desc: "Fires before calling LLM. Allows inspecting/mutating messages."
  declare_hook :after_llm_call, desc: "Fires after LLM call completes. Informational."
  declare_hook :on_render_response, desc: "ROP middleware. Formats/renders response text in-place."
  declare_hook :after_tool_call, desc: "Fires after a tool execution completes. Informational."
  declare_hook :after_llm_response, desc: "Fires when an LLM response with metadata is received. Informational."
end

.reset! ⇒ Object

Reset all subscribers, hooks, and active plugins (useful for testing)



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# File 'lib/norn/plugin_manager.rb', line 143

def reset!
  @lock.synchronize do
    @subscribers.clear
    @declared_hooks.clear
    @active_plugins.clear
  end
end

.subscribe(event, &block) ⇒ Object

Subscribe a block to a specific hook event



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# File 'lib/norn/plugin_manager.rb', line 38

def subscribe(event, &block)
  @lock.synchronize do
    @subscribers[event.to_sym] << block
  end
end

.trigger(event, *args) ⇒ Object

Trigger an informational event (parallel/notification only). Does not mutate state, and does not halt on failure.



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# File 'lib/norn/plugin_manager.rb', line 57

def trigger(event, *args)
  # 1. Call legacy block-based subscribers
  blocks = @lock.synchronize { @subscribers[event.to_sym].dup }
  blocks.each do |block|
    begin
      block.call(*args)
    rescue => e
      warn "Norn Plugin Trigger Warning: #{event} subscriber failed - #{e.message}"
    end
  end

  # Auto-instantiate registered plugins if active_plugins is empty (crucial for spec environments)
  ensure_active_plugins!

  # 2. Call matching instance methods on registered OO plugin instances
  @active_plugins.each do |plugin|
    if plugin.respond_to?(event.to_sym)
      begin
        plugin.send(event.to_sym, *args)
      rescue => e
        warn "Norn Plugin Trigger Warning: #{event} on #{plugin.class} failed - #{e.message}"
      end
    end
  end
end

.trigger_middleware(event, initial_payload) ⇒ Object

Trigger a sequential ROP middleware pipeline. Sequentially reduces a Hash payload. If any subscriber fails or returns a Failure, the pipeline checks its recovery policy. If the policy is :recover, Norn logs a non-fatal warning and recovers the previous success payload, otherwise it derails.



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# File 'lib/norn/plugin_manager.rb', line 87

def trigger_middleware(event, initial_payload)
  # 1. Accumulate all subscribers (legacy blocks + OO plugin instances)
  subscribers = @lock.synchronize { @subscribers[event.to_sym].dup }

  # Auto-instantiate registered plugins if active_plugins is empty (crucial for spec environments)
  ensure_active_plugins!

  @active_plugins.each do |plugin|
    subscribers << plugin if plugin.respond_to?(event.to_sym)
  end

  # 2. Sequentially reduce payload using monadic composition (Kleisli reduce)
  subscribers.reduce(Success(initial_payload)) do |result, subscriber|
    result.bind do |payload|
      policy = resolve_policy(subscriber, event)

      begin
        output = if subscriber.respond_to?(:call)
                   subscriber.call(payload)
                 else
                   subscriber.send(event.to_sym, payload)
                 end

        # Standardize returned output to a monadic Result
        if output.is_a?(Dry::Monads::Result)
          if output.failure? && policy == :recover
            # Non-fatal Failure: Report and recover previous success payload!
            report_non_fatal_failure(output.failure, event, subscriber)
            Success(payload)
          else
            output
          end
        elsif output.is_a?(Hash)
          Success(output)
        else
          # If the subscriber returned nil/nothing, preserve input payload unchanged
          Success(payload)
        end
      rescue => e
        # Catch subscriber exceptions and handle according to policy
        failure = Norn::FailurePayload.new(e, { event: event, payload: payload })

        if policy == :recover
          # Non-fatal Exception: Report and recover previous success payload!
          report_non_fatal_failure(failure, event, subscriber)
          Success(payload)
        else
          # Fatal Exception: Derail immediately to Failure track
          Failure(failure)
        end
      end
    end
  end
end