Class: NewRelic::Agent::JavaScriptInstrumentor

Inherits:
Object
  • Object
show all
Includes:
Coerce
Defined in:
lib/new_relic/agent/javascript_instrumentor.rb

Constant Summary collapse

RUM_KEY_LENGTH = 
13
BEACON_KEY = 
'beacon'.freeze
ERROR_BEACON_KEY = 
'errorBeacon'.freeze
LICENSE_KEY_KEY = 
'licenseKey'.freeze
APPLICATIONID_KEY = 
'applicationID'.freeze
TRANSACTION_NAME_KEY = 
'transactionName'.freeze
QUEUE_TIME_KEY = 
'queueTime'.freeze
APPLICATION_TIME_KEY = 
'applicationTime'.freeze
AGENT_KEY = 
'agent'.freeze
SSL_FOR_HTTP_KEY = 
'sslForHttp'.freeze
ATTS_KEY = 
'atts'.freeze
ATTS_USER_SUBKEY = 
'u'.freeze
ATTS_AGENT_SUBKEY = 
'a'.freeze

Instance Method Summary collapse

Methods included from Coerce

boolean_int!, float, float!, int, int!, int_or_nil, log_failure, scalar, string, value_or_nil

Constructor Details

#initialize(event_listener) ⇒ JavaScriptInstrumentor

Returns a new instance of JavaScriptInstrumentor.



15
16
17
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 15

def initialize(event_listener)
  event_listener.subscribe(:initial_configuration_complete, &method(:log_configuration))
end

Instance Method Details

#add_attributes(data, txn) ⇒ Object 



172
173
174
175
176
177
178
179
180
181
182
183
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 172

def add_attributes(data, txn)
  return unless txn

  atts = {}
  append_custom_attributes!(txn, atts)
  append_agent_attributes!(txn, atts)

  unless atts.empty?
    json = ::JSON.dump(atts)
    data[ATTS_KEY] = obfuscator.obfuscate(json)
  end
end

#add_ssl_for_http(data) ⇒ Object 



165
166
167
168
169
170
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 165

def add_ssl_for_http(data)
  ssl_for_http = NewRelic::Agent.config[:'browser_monitoring.ssl_for_http']
  unless ssl_for_http.nil?
    data[SSL_FOR_HTTP_KEY] = ssl_for_http
  end
end

#append_agent_attributes!(txn, atts) ⇒ Object 



197
198
199
200
201
202
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 197

def append_agent_attributes!(txn, atts)
  agent_attributes = txn.attributes.agent_attributes_for(NewRelic::Agent::AttributeFilter::DST_BROWSER_MONITORING)
  unless agent_attributes.empty?
    atts[ATTS_AGENT_SUBKEY] = agent_attributes
  end
end

#append_custom_attributes!(txn, atts) ⇒ Object 



185
186
187
188
189
190
191
192
193
194
195
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 185

def append_custom_attributes!(txn, atts)
  custom_attributes = txn.attributes.custom_attributes_for(NewRelic::Agent::AttributeFilter::DST_BROWSER_MONITORING)
  if custom_attributes.empty?
    NewRelic::Agent.logger.debug("#{self.class}: No custom attributes found to append.")
    return
  end

  NewRelic::Agent.logger.debug("#{self.class}: Appending the following custom attribute keys for browser " \
    "monitoring: #{custom_attributes.keys}")
  atts[ATTS_USER_SUBKEY] = custom_attributes
end

#browser_timing_config(state, nonce = nil) ⇒ Object 



105
106
107
108
109
110
111
112
113
114
115
116
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 105

def browser_timing_config(state, nonce = nil)
  txn = state.current_transaction
  return '' if txn.nil?

  txn.freeze_name_and_execute_if_not_ignored do
    data = data_for_js_agent(txn)
    json = ::JSON.dump(data)
    return html_safe_if_needed("\n<script type=\"text/javascript\"#{create_nonce(nonce)}>window.NREUM||(NREUM={});NREUM.info=#{json}</script>")
  end

  ''
end

#browser_timing_header(nonce = nil) ⇒ Object

THREAD_LOCAL_ACCESS



85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 85

def browser_timing_header(nonce = nil) # THREAD_LOCAL_ACCESS
  return '' unless js_enabled_and_ready? # fast exit

  state = NewRelic::Agent::Tracer.state

  return '' unless insert_js?(state) # slower exit

  bt_config = browser_timing_config(state, nonce)
  return '' if bt_config.empty?

  bt_config + browser_timing_loader(nonce)
rescue => e
  ::NewRelic::Agent.logger.debug('Failure during RUM browser_timing_header construction', e)
  ''
end

#browser_timing_loader(nonce = nil) ⇒ Object 



101
102
103
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 101

def browser_timing_loader(nonce = nil)
  html_safe_if_needed("\n<script type=\"text/javascript\"#{create_nonce(nonce)}>#{Agent.config[:js_agent_loader]}</script>")
end

#create_nonce(nonce = nil) ⇒ Object 



118
119
120
121
122
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 118

def create_nonce(nonce = nil)
  return '' unless nonce

  " nonce=\"#{nonce.to_s}\""
end

#data_for_js_agent(transaction) ⇒ Object

NOTE: Internal prototyping may override this, so leave name stable!



138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 138

def data_for_js_agent(transaction)
  queue_time_in_seconds = [transaction.queue_time, 0.0].max
  start_time_in_seconds = [transaction.start_time, 0.0].max
  app_time_in_seconds = Process.clock_gettime(Process::CLOCK_REALTIME) - start_time_in_seconds

  queue_time_in_millis = (queue_time_in_seconds * 1000.0).round
  app_time_in_millis = (app_time_in_seconds * 1000.0).round

  transaction_name = transaction.best_name || ::NewRelic::Agent::UNKNOWN_METRIC

  data = {
    BEACON_KEY => NewRelic::Agent.config[:beacon],
    ERROR_BEACON_KEY => NewRelic::Agent.config[:error_beacon],
    LICENSE_KEY_KEY => NewRelic::Agent.config[:browser_key],
    APPLICATIONID_KEY => NewRelic::Agent.config[:application_id],
    TRANSACTION_NAME_KEY => obfuscator.obfuscate(transaction_name),
    QUEUE_TIME_KEY => queue_time_in_millis,
    APPLICATION_TIME_KEY => app_time_in_millis,
    AGENT_KEY => NewRelic::Agent.config[:js_agent_file]
  }

  add_ssl_for_http(data)
  add_attributes(data, transaction)

  data
end

#enabled? ⇒ Boolean

Returns:

  • (Boolean) 


29
30
31
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 29

def enabled?
  Agent.config[:'rum.enabled'] && !!Agent.config[:beacon]
end

#html_safe_if_needed(string) ⇒ Object 



204
205
206
207
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 204

def html_safe_if_needed(string)
  string = string.html_safe if string.respond_to?(:html_safe)
  string
end

#insert_js?(state) ⇒ Boolean

Returns:

  • (Boolean) 


62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 62

def insert_js?(state)
  if !state.current_transaction
    ::NewRelic::Agent.logger.debug('Not in transaction. Skipping browser instrumentation.')
    false
  elsif !state.is_execution_traced?
    ::NewRelic::Agent.logger.debug('Execution is not traced. Skipping browser instrumentation.')
    false
  elsif state.current_transaction.ignore_enduser?
    ::NewRelic::Agent.logger.debug('Ignore end user for this transaction is set. Skipping browser instrumentation.')
    false
  else
    true
  end
rescue => e
  ::NewRelic::Agent.logger.debug('Failure during insert_js', e)
  false
end

#js_enabled_and_ready? ⇒ Boolean

Returns:

  • (Boolean) 


37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 37

def js_enabled_and_ready?
  if !enabled?
    ::NewRelic::Agent.logger.log_once(:debug, :js_agent_disabled,
      'JS agent instrumentation is disabled.')
    false
  elsif missing_config?(:js_agent_loader)
    ::NewRelic::Agent.logger.log_once(:debug, :missing_js_agent_loader,
      'Missing :js_agent_loader. Skipping browser instrumentation.')
    false
  elsif missing_config?(:beacon)
    ::NewRelic::Agent.logger.log_once(:debug, :missing_beacon,
      'Beacon configuration not received (yet?). Skipping browser instrumentation.')
    false
  elsif missing_config?(:browser_key)
    ::NewRelic::Agent.logger.log_once(:debug, :missing_browser_key,
      'Browser key is not set. Skipping browser instrumentation.')
    false
  else
    true
  end
rescue => e
  ::NewRelic::Agent.logger.debug("Failure during 'js_enabled_and_ready?'", e)
  false
end

#log_configuration ⇒ Object 



19
20
21
22
23
24
25
26
27
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 19

def log_configuration
  NewRelic::Agent.logger.debug("JS agent loader requested: #{NewRelic::Agent.config[:'browser_monitoring.loader']}",
    "JS agent loader debug: #{NewRelic::Agent.config[:'browser_monitoring.debug']}",
    "JS agent loader version: #{NewRelic::Agent.config[:'browser_monitoring.loader_version']}")

  if !NewRelic::Agent.config[:'rum.enabled']
    NewRelic::Agent.logger.debug('Real User Monitoring is disabled for this agent. Edit your configuration to change this.')
  end
end

#missing_config?(key) ⇒ Boolean

Returns:

  • (Boolean) 


80
81
82
83
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 80

def missing_config?(key)
  value = NewRelic::Agent.config[key]
  value.nil? || value.empty?
end

#obfuscator ⇒ Object 



33
34
35
 
# File 'lib/new_relic/agent/javascript_instrumentor.rb', line 33

def obfuscator
  @obfuscator ||= NewRelic::Agent::Obfuscator.new(NewRelic::Agent.config[:license_key], RUM_KEY_LENGTH)
end