Class: Lens::Rails::RequestScopeMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/lens/rails/requests_exporter.rb

Overview

Tiny Rack middleware that opens a per-request operation accumulator so SQL and view notifications can attach to the right request on the current thread.

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ RequestScopeMiddleware

Returns a new instance of RequestScopeMiddleware.



12
13
14
 
# File 'lib/lens/rails/requests_exporter.rb', line 12

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/lens/rails/requests_exporter.rb', line 16

def call(env)
  wall_start = Time.now
  Thread.current[:lens_request_id] = env["action_dispatch.request_id"]
  Thread.current[:lens_request_ops] = []
  Thread.current[:lens_request_start] = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  Thread.current[:lens_request_wall_start] = wall_start
  Thread.current[:lens_queue_time_ms] = parse_queue_time(env, wall_start)
  @app.call(env)
ensure
  Thread.current[:lens_request_id] = nil
  Thread.current[:lens_request_ops] = nil
  Thread.current[:lens_request_start] = nil
  Thread.current[:lens_request_wall_start] = nil
  Thread.current[:lens_queue_time_ms] = nil
  Thread.current[:lens_controller] = nil
  Thread.current[:lens_action] = nil
end