Rack

# config.ru
require "appsignal"                           # Load AppSignal

Appsignal.start                               # Start the AppSignal integration

# Add the Rack EventMiddleware first
use Appsignal::Rack::EventMiddleware
# Add the Rack InstrumentationMiddleware
use Appsignal::Rack::InstrumentationMiddleware

# Load your app with a require statement here, like
require_relative "app"

# Add other middleware here if needed

# Finally, run the app
use MyApp.run

# config.ru
# Load and configure AppSignal
require "appsignal"                           # Load AppSignal

Appsignal.config = Appsignal::Config.new(
  File.expand_path("../", __FILE__),          # Application root path
  ENV["RACK_ENV"],                            # Application environment
)
Appsignal.start                               # Start the AppSignal integration
Appsignal.start_logger                        # Start logger

# Load your app with a require statement here, like
require_relative "app"

# Add the GenericInstrumentation middleware
use Appsignal::Rack::GenericInstrumentation

# Add other middleware here if needed

# Finally, run the app
use MyApp.run

# app.rb
require "rack"

# Example pure-Rack app
class MyApp
  def call(env)
    case [env["REQUEST_METHOD"], env["PATH_INFO"]]
    when ["GET", "/"]
      Appsignal.set_action("GET /") # Action name set here
      body = <<~BODY
        <h1>Rack example app</h1>

        <ul>
          <li><a href="/slow">Slow request</a></li>
          <li><a href="/error">Error request</a></li>
        </ul>
      BODY
      [200, {"Content-Type" => "text/html"}, [body]]
    when ["GET", "/slow"]
      Appsignal.set_action("GET /slow") # Action name set here
      sleep 1
      [200, {"Content-Type" => "text/plain"}, ["Slow response"]]
    when ["GET", "/error"]
      Appsignal.set_action("GET /error") # Action name set here
      raise "uh oh"
    else
      Appsignal.set_action("NotFound") # Action name set here
      [404, {"Content-Type" => "text/plain"}, ["Page not found"]]
    end
  end
end