Class: AppMap::Middleware::RemoteRecording

Inherits:
Object
  • Object
show all
Defined in:
lib/appmap/middleware/remote_recording.rb

Overview

RemoteRecording adds /_appmap/record routes to control recordings via HTTP requests

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ RemoteRecording

Returns a new instance of RemoteRecording.



7
8
9
10
11
12
13
14
 
# File 'lib/appmap/middleware/remote_recording.rb', line 7

def initialize(app)
  require 'appmap/command/record'
  require 'json'

  @app = app
  @config = AppMap.configure
  AppMap::Hook.hook(@config)
end

Instance Method Details

#call(env) ⇒ Object 



81
82
83
84
85
86
 
# File 'lib/appmap/middleware/remote_recording.rb', line 81

def call(env)
  req = Rack::Request.new(env)
  return handle_record_request(req) if req.path == '/_appmap/record'

  @app.call(env)
end

#event_loop ⇒ Object 



16
17
18
19
20
21
22
23
24
25
 
# File 'lib/appmap/middleware/remote_recording.rb', line 16

def event_loop
  loop do
    event = @tracer.next_event if @tracer
    if event
      @events << event.to_h
    else
      sleep 0.0001
    end
  end
end

#handle_record_request(req) ⇒ Object 



92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
 
# File 'lib/appmap/middleware/remote_recording.rb', line 92

def handle_record_request(req)
  method = req.env['REQUEST_METHOD']

  status, body = \
    if method.eql?('GET')
      recording_state
    elsif method.eql?('POST')
      start_recording
    elsif method.eql?('DELETE')
      stop_recording(req)
    else
      [ 404, '' ]
    end

  [status, { 'Content-Type' => 'application/json' }, [body || '']]
end

#html_response?(headers) ⇒ Boolean

Returns:

  • (Boolean) 


109
110
111
 
# File 'lib/appmap/middleware/remote_recording.rb', line 109

def html_response?(headers)
  headers['Content-Type'] && headers['Content-Type'] =~ /html/
end

#recording? ⇒ Boolean

Returns:

  • (Boolean) 


113
114
115
 
# File 'lib/appmap/middleware/remote_recording.rb', line 113

def recording?
  !@event_thread.nil?
end

#recording_state ⇒ Object 



88
89
90
 
# File 'lib/appmap/middleware/remote_recording.rb', line 88

def recording_state
  [ 200, JSON.generate({ enabled: recording? }) ]
end

#start_recording ⇒ Object 



27
28
29
30
31
32
33
34
35
36
 
# File 'lib/appmap/middleware/remote_recording.rb', line 27

def start_recording
  return [ 409, 'Recording is already in progress' ] if @tracer

  @events = []
  @tracer = AppMap.tracing.trace
  @event_thread = Thread.new { event_loop }
  @event_thread.abort_on_exception = true

  [ 200 ]
end

#stop_recording(req) ⇒ Object 



38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/appmap/middleware/remote_recording.rb', line 38

def stop_recording(req)
  return [ 404, 'No recording is in progress' ] unless @tracer

  tracer = @tracer
  @tracer = nil

  AppMap.tracing.delete(tracer)

  @event_thread.exit
  @event_thread.join
  @event_thread = nil

  # Delete the events which are calls to or returns from the URL path _appmap/record
  # because these are not of interest to the user.
  is_control_command_event = lambda do |event|
    event[:event] == :call &&
      event[:http_server_request] &&
      event[:http_server_request][:path_info] == '/_appmap/record'
  end
  control_command_events = @events.select(&is_control_command_event)

  is_return_from_control_command_event = lambda do |event|
    event[:parent_id] && control_command_events.find { |e| e[:id] == event[:parent_id] }
  end

  @events.delete_if(&is_control_command_event)
  @events.delete_if(&is_return_from_control_command_event)

  require 'appmap/command/record'
  metadata = AppMap::Command::Record.detect_metadata
  metadata[:recorder] = {
    name: 'remote_recording'
  }

  response = JSON.generate \
    version: AppMap::APPMAP_FORMAT_VERSION,
    classMap: AppMap.class_map(@config, tracer.event_methods),
    metadata: metadata,
    events: @events

  [ 200, response ]
end