Module: Legion::API::Routes::Prompts

Defined in:
lib/legion/api/prompts.rb

Class Method Summary collapse

Class Method Details

.register_list(app) ⇒ Object 



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# File 'lib/legion/api/prompts.rb', line 35

def self.register_list(app)
  app.get '/api/prompts' do
    client = prompt_client
    result = client.list_prompts
    json_response(result)
  rescue StandardError => e
    Legion::Logging.log_exception(e, payload_summary: 'API GET /api/prompts', component_type: :api)
    json_error('execution_error', e.message, status_code: 500)
  end
end

.register_run(app) ⇒ Object 



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# File 'lib/legion/api/prompts.rb', line 64

def self.register_run(app)
  app.post '/api/prompts/:name/run' do
    Legion::Logging.debug "API: POST /api/prompts/#{params[:name]}/run params=#{params.keys}"
    require_llm!

    name      = params[:name]
    body      = parse_request_body
    variables = body[:variables] || {}
    version   = body[:version]
    model     = body[:model]
    provider  = body[:provider]

    client = prompt_client
    rendered = client.render_prompt(name: name, variables: variables, version: version)

    if rendered[:error]
      code = rendered[:error] == 'not_found' ? 404 : 422
      halt code, json_error(rendered[:error], "prompt '#{name}' #{rendered[:error].tr('_', ' ')}", status_code: code)
    end

    session  = Legion::LLM.chat(model: model, provider: provider,
                                caller: { source: 'api', endpoint: 'prompts' })
    response = session.ask(rendered[:rendered])

    prompt_version = rendered[:prompt_version]
    model_used     = session.model.to_s

    usage = {
      input_tokens:  response.respond_to?(:input_tokens) ? response.input_tokens : nil,
      output_tokens: response.respond_to?(:output_tokens) ? response.output_tokens : nil
    }

    Legion::Logging.info "API: ran prompt #{name} version=#{prompt_version} model=#{model_used}"
    json_response({
                    name:            name,
                    version:         prompt_version,
                    rendered_prompt: rendered[:rendered],
                    response:        response.content,
                    usage:           usage,
                    model:           model_used,
                    provider:        provider
                  })
  rescue StandardError => e
    Legion::Logging.log_exception(e, payload_summary: "API POST /api/prompts/#{params[:name]}/run", component_type: :api)
    json_error('execution_error', e.message, status_code: 500)
  end
end

.register_show(app) ⇒ Object 



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# File 'lib/legion/api/prompts.rb', line 46

def self.register_show(app)
  app.get '/api/prompts/:name' do
    name = params[:name]
    client = prompt_client
    result = client.get_prompt(name: name)

    if result[:error]
      Legion::Logging.warn "API GET /api/prompts/#{name} returned 404: prompt not found"
      halt 404, json_error('not_found', "prompt '#{name}' not found", status_code: 404)
    end

    json_response(result)
  rescue StandardError => e
    Legion::Logging.log_exception(e, payload_summary: "API GET /api/prompts/#{params[:name]}", component_type: :api)
    json_error('execution_error', e.message, status_code: 500)
  end
end

.registered(app) ⇒ Object 



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# File 'lib/legion/api/prompts.rb', line 7

def self.registered(app)
  app.helpers do
    define_method(:require_llm!) do
      return if defined?(Legion::LLM) &&
                Legion::LLM.respond_to?(:started?) &&
                Legion::LLM.started?

      halt 503, json_error('llm_unavailable', 'LLM subsystem is not available', status_code: 503)
    end

    define_method(:prompt_client) do
      require 'legion/extensions/prompt/client'
      db = Legion::Data.connection
      unless db.table_exists?(:prompts)
        halt 503, json_error('prompt_unavailable', 'prompts table does not exist — run lex-prompt migrations', status_code: 503)
      end
      Legion::Extensions::Prompt::Client.new(db: db)
    rescue LoadError => e
      Legion::Logging.warn "Prompts#prompt_client failed to load lex-prompt: #{e.message}" if defined?(Legion::Logging)
      halt 503, json_error('prompt_unavailable', 'lex-prompt is not loaded', status_code: 503)
    end
  end

  register_list(app)
  register_show(app)
  register_run(app)
end