Class: Wrenchmode::Rack

Inherits:
Object
  • Object
show all
Defined in:
lib/wrenchmode/rack.rb

Constant Summary collapse

CLIENT_NAME = 
"wrenchmode-rack"
VERSION = 
'0.1.0'
HEROKU_JWT_VAR =

The ENV var set on Heroku where we can retrieve the JWT

"WRENCHMODE_PROJECT_JWT"
SWITCH_URL_KEY = 
"switch_url"
TEST_MODE_KEY = 
"test_mode"
IS_SWITCHED_KEY = 
"is_switched"
IP_WHITELIST_KEY = 
"ip_whitelist"
REVERSE_PROXY_KEY = 
"reverse_proxy"

Instance Method Summary collapse

Constructor Details

#initialize(app, opts = {}) ⇒ Rack

Returns a new instance of Rack.



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# File 'lib/wrenchmode/rack.rb', line 20

def initialize(app, opts = {})
  @app = app       

  # Symbolize keys
  opts = symbolize_keys(opts)
  opts = {
    force_open: false,
    ignore_test_mode: true,
    disable_local_wrench: false, # LocalWrench is our "brand name", want to avoid scaring people will talk of proxies
    status_protocol: "https",
    status_host: "wrenchmode.com",
    status_path: "/api/projects/status",
    check_delay_secs: 5,
    logging: false,
    read_timeout_secs: 3,
    trust_remote_ip: true
  }.merge(opts)

  # The JWT can be set either explicity, or implicitly if Wrenchmode is added as a Heroku add-on
  # The WRENCHMODE_PROJECT_JWT variable is set as part of the Heroku add-on provisioning process
  @jwt = opts[:jwt] || ENV[HEROKU_JWT_VAR]

  @ignore_test_mode = opts[:ignore_test_mode]
  @disable_reverse_proxy = opts[:disable_local_wrench]
  @force_open = opts[:force_open]
  @status_url = "#{opts[:status_protocol]}://#{opts[:status_host]}#{opts[:status_path]}"
  @check_delay_secs = opts[:check_delay_secs]
  @logging = opts[:logging]
  @read_timeout_secs = opts[:read_timeout_secs]
  @ip_whitelist = []
  @logger = nil
  @trust_remote_ip = opts[:trust_remote_ip]

  @enable_reverse_proxy = false

  @made_contact = false

  # Use a queue with 0 or 1 items to allow the threads to communicate. When a response from the main Wrenchmode server is received,
  # parse the JSON and put the hash in the queue. Then, the main request thread will update the underlying middleware state
  # the next time a request is received.
  @queue = Queue.new
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/wrenchmode/rack.rb', line 63

def call(env)      
  @logger = env['rack.logger'] if @logging && !@logger

  unless @jwt
    log("[Wrenchmode] No JWT specified so bypassing Wrenchmode. Please configure Wrenchmode with a JWT.", Logger::ERROR)
    return @app.call(env)
  end

  # On startup, we need to give it a chance to make contact
  @check_thread ||= start_check_thread()
  sleep(0.01) while !@made_contact

  # If we've gotten a new response from the server, use it
  # to update local status
  json = begin
    @queue.pop(true)
  rescue ThreadError
    nil
  end
  update_status(json) if json

  should_display_wrenchmode = false
  if @switched

    should_display_wrenchmode = !@force_open
    should_display_wrenchmode &&= !ip_whitelisted?(env)
  end

  if should_display_wrenchmode
    if @enable_reverse_proxy
      reverse_proxy
    else
      redirect
    end
  else
    @app.call(env)
  end
end

#update_status(json) ⇒ Object 



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# File 'lib/wrenchmode/rack.rb', line 102

def update_status(json)
  @switch_url = json[SWITCH_URL_KEY]
  test_mode = json[TEST_MODE_KEY] || false
  @switched = json[IS_SWITCHED_KEY] && !(@ignore_test_mode && test_mode)
  @ip_whitelist = json[IP_WHITELIST_KEY] || []

  @enable_reverse_proxy = false
  if json[REVERSE_PROXY_KEY] && !@disable_reverse_proxy
    @enable_reverse_proxy = json[REVERSE_PROXY_KEY]["enabled"]
    @reverse_proxy_config = symbolize_keys(json[REVERSE_PROXY_KEY])
  end
end