Class: Profiler::Middleware::ProfilerMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/profiler/middleware/profiler_middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ ProfilerMiddleware

Returns a new instance of ProfilerMiddleware.



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# File 'lib/profiler/middleware/profiler_middleware.rb', line 10

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/profiler/middleware/profiler_middleware.rb', line 14

def call(env)
  return @app.call(env) unless should_profile?(env)

  profile = Models::Profile.new(build_request(env))
  Profiler::CurrentContext.token = profile.token

  # Capture request body before app processes it
  req_body_raw = read_rack_input(env)

  # Store profile in env for collectors
  env["profiler.profile"] = profile

  # Create and subscribe collectors
  collectors = create_collectors(profile)
  env["profiler.collectors"] = collectors

  # Measure memory before
  memory_before = current_memory if Profiler.configuration.track_memory

  # Process request
  status, headers, body = @app.call(env)

  # Measure memory after
  if Profiler.configuration.track_memory
    memory_after = current_memory
    profile.memory = memory_after - memory_before
  end

  # Collect and buffer response body (avoids double-reading by ToolbarInjector)
  body_content = collect_body(body)
  body = [body_content]

  # Finish profile
  profile.finish(status, headers)

  # Store request and response bodies
  profile.set_bodies(
    request_body: req_body_raw,
    response_body: body_content,
    req_content_type: env["CONTENT_TYPE"].to_s,
    resp_content_type: (headers["content-type"] || headers["Content-Type"]).to_s
  )

  # Collect data from all collectors
  collectors.each do |collector|
    begin
      collector.collect if collector.respond_to?(:collect)
      profile.add_collector_metadata(collector)
    rescue => e
      warn "Collector #{collector.class} failed: #{e.message}"
    end
  end

  # Store profile
  Profiler.storage.save(profile.token, profile)
  Profiler::CurrentContext.clear

  # Add profiler token header
  headers["X-Profiler-Token"] = profile.token

  # Inject toolbar if HTML response
  if html_response?(headers)
    nonce = env['action_dispatch.content_security_policy_nonce']
    body = ToolbarInjector.new(body, profile.token, nonce).inject
  end

  [status, headers, body]
rescue => e
  warn "Profiler error: #{e.message}\n#{e.backtrace.join("\n")}"
  @app.call(env)
end