Class: DeadBro::Subscriber

Inherits:
Object
  • Object
show all
Defined in:
lib/dead_bro/subscriber.rb

Constant Summary collapse

EVENT_NAME = 
"process_action.action_controller"

Class Method Summary collapse

Class Method Details

.cache_hits(data) ⇒ Object 



338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
 
# File 'lib/dead_bro/subscriber.rb', line 338

def self.cache_hits(data)
  if data[:cache_hits]
    data[:cache_hits]
  elsif defined?(Rails) && Rails.cache.respond_to?(:stats)
    begin
      Rails.cache.stats[:hits]
    rescue
      0
    end
  else
    0
  end
rescue
  0
end

.cache_misses(data) ⇒ Object 



354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
 
# File 'lib/dead_bro/subscriber.rb', line 354

def self.cache_misses(data)
  if data[:cache_misses]
    data[:cache_misses]
  elsif defined?(Rails) && Rails.cache.respond_to?(:stats)
    begin
      Rails.cache.stats[:misses]
    rescue
      0
    end
  else
    0
  end
rescue
  0
end

.drain_request_tracking ⇒ Object

Release per-subscriber thread-local state when we’ve decided not to build a payload (disabled / excluded / sampled out). Without this, a subsequent request reusing the same Puma thread would see stale queries/events.



172
173
174
175
176
177
178
179
180
181
182
183
184
185
 
# File 'lib/dead_bro/subscriber.rb', line 172

def self.drain_request_tracking
  DeadBro::SqlSubscriber.stop_request_tracking if defined?(DeadBro::SqlSubscriber)
  DeadBro::CacheSubscriber.stop_request_tracking if defined?(DeadBro::CacheSubscriber)
  DeadBro::RedisSubscriber.stop_request_tracking if defined?(DeadBro::RedisSubscriber)
  DeadBro::ElasticsearchSubscriber.stop_request_tracking if defined?(DeadBro::ElasticsearchSubscriber)
  DeadBro::ViewRenderingSubscriber.stop_request_tracking if defined?(DeadBro::ViewRenderingSubscriber)
  DeadBro::LightweightMemoryTracker.stop_request_tracking if defined?(DeadBro::LightweightMemoryTracker)
  if DeadBro.configuration.allocation_tracking_enabled && defined?(DeadBro::MemoryTrackingSubscriber)
    DeadBro::MemoryTrackingSubscriber.stop_request_tracking
  end
  Thread.current[:dead_bro_http_events] = nil
rescue
  # Best effort — draining must never raise from the notifications callback.
end

.extract_user_id(data) ⇒ Object 



370
371
372
373
374
 
# File 'lib/dead_bro/subscriber.rb', line 370

def self.extract_user_id(data)
  data[:headers].env["warden"].user.id
rescue
  nil
end

.gc_stats ⇒ Object 



304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
 
# File 'lib/dead_bro/subscriber.rb', line 304

def self.gc_stats
  if defined?(GC) && GC.respond_to?(:stat)
    stats = GC.stat
    {
      count: stats[:count] || 0,
      heap_allocated_pages: stats[:heap_allocated_pages] || 0,
      heap_sorted_pages: stats[:heap_sorted_pages] || 0,
      total_allocated_objects: stats[:total_allocated_objects] || 0
    }
  else
    {}
  end
rescue
  {}
end

.memory_usage_mb ⇒ Object 



298
299
300
301
302
 
# File 'lib/dead_bro/subscriber.rb', line 298

def self.memory_usage_mb
  DeadBro::MemoryHelpers.rss_mb
rescue
  0
end

.safe_host ⇒ Object 



194
195
196
197
198
199
200
201
202
203
204
 
# File 'lib/dead_bro/subscriber.rb', line 194

def self.safe_host
  if defined?(Rails) && Rails.respond_to?(:application)
    begin
      Rails.application.class.module_parent_name
    rescue
      ""
    end
  else
    ""
  end
end

.safe_params(data) ⇒ Object 



206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
 
# File 'lib/dead_bro/subscriber.rb', line 206

def self.safe_params(data)
  return {} unless data[:params]

  params = data[:params]
  begin
    params = params.to_unsafe_h if params.respond_to?(:to_unsafe_h)
  rescue
  end

  unless params.is_a?(Hash)
    return {}
  end

  # Remove router-provided keys that we already send at top-level
  router_keys = %w[controller action format]

  # Filter out sensitive parameters
  sensitive_keys = %w[password password_confirmation token secret key]

  filtered = params.dup
  router_keys.each { |k| filtered.delete(k) || filtered.delete(k.to_sym) }
  filtered = filtered.except(*sensitive_keys, *sensitive_keys.map(&:to_sym)) if filtered.respond_to?(:except)

  # Truncate deeply to keep payload small and safe
  truncate_value(filtered)
rescue
  {}
end

.safe_path(data) ⇒ Object 



187
188
189
190
191
192
 
# File 'lib/dead_bro/subscriber.rb', line 187

def self.safe_path(data)
  path = data[:path] || (data[:request] && data[:request].path)
  path.to_s
rescue
  ""
end

.safe_user_agent(data) ⇒ Object 



254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
 
# File 'lib/dead_bro/subscriber.rb', line 254

def self.safe_user_agent(data)
  begin
    # Prefer request object if available
    if data[:request]
      ua = nil
      if data[:request].respond_to?(:user_agent)
        ua = data[:request].user_agent
      elsif data[:request].respond_to?(:env)
        ua = data[:request].env && data[:request].env["HTTP_USER_AGENT"]
      end
      return ua.to_s[0..200]
    end

    # Fallback to headers object/hash if present in notification data
    if data[:headers]
      headers = data[:headers]
      if headers.respond_to?(:[])
        ua = headers["HTTP_USER_AGENT"] || headers["User-Agent"] || headers["user-agent"]
        return ua.to_s[0..200]
      elsif headers.respond_to?(:to_h)
        h = begin
          headers.to_h
        rescue
          {}
        end
        ua = h["HTTP_USER_AGENT"] || h["User-Agent"] || h["user-agent"]
        return ua.to_s[0..200]
      end
    end

    # Fallback to env hash if present in notification data
    if data[:env].is_a?(Hash)
      ua = data[:env]["HTTP_USER_AGENT"]
      return ua.to_s[0..200]
    end

    ""
  rescue
    ""
  end
rescue
  ""
end

.sql_count(data) ⇒ Object 



320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
 
# File 'lib/dead_bro/subscriber.rb', line 320

def self.sql_count(data)
  # Count SQL queries from the payload if available
  if data[:sql_count]
    data[:sql_count]
  elsif defined?(ActiveRecord) && ActiveRecord::Base.connection
    # Try to get from ActiveRecord connection
    begin
      ActiveRecord::Base.connection.query_cache.size
    rescue
      0
    end
  else
    0
  end
rescue
  0
end

.subscribe!(client: Client.new) ⇒ Object 



9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
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
164
165
166
167
 
# File 'lib/dead_bro/subscriber.rb', line 9

def self.subscribe!(client: Client.new)
  ActiveSupport::Notifications.subscribe(EVENT_NAME) do |name, started, finished, _unique_id, data|
    # When disabled remotely, fire a heartbeat at most once per minute so the gem
    # can detect when tracking has been re-enabled, then skip all tracking.
    unless DeadBro.configuration.enabled
      client.post_heartbeat if DeadBro.configuration.heartbeat_due?
      drain_request_tracking
      next
    end

    # Skip excluded controllers or controller#action pairs
    # Also check exclusive_controller_actions - if defined, only track those
    notification = data.is_a?(Hash) ? data : {}
    controller_name = notification[:controller].to_s
    action_name = notification[:action].to_s
    begin
      if DeadBro.configuration.excluded_controller?(controller_name, action_name)
        drain_request_tracking
        next
      end
      unless DeadBro.configuration.exclusive_controller?(controller_name, action_name)
        drain_request_tracking
        next
      end
    rescue
      drain_request_tracking
      next
    end

    has_error = data[:exception] || data[:exception_object]
    # Errors always ship regardless of sampling (this is what the docs promise).
    unless has_error || DeadBro.configuration.should_sample?
      drain_request_tracking
      next
    end

    duration_ms = ((finished - started) * 1000.0).round(2)
    # Stop SQL tracking and get collected queries (this was started by the request)
    sql_queries = DeadBro::SqlSubscriber.stop_request_tracking

    # Stop cache, redis, and elasticsearch tracking
    cache_events = defined?(DeadBro::CacheSubscriber) ? DeadBro::CacheSubscriber.stop_request_tracking : []
    redis_events = defined?(DeadBro::RedisSubscriber) ? DeadBro::RedisSubscriber.stop_request_tracking : []
    elasticsearch_events = defined?(DeadBro::ElasticsearchSubscriber) ? DeadBro::ElasticsearchSubscriber.stop_request_tracking : []

    # Stop view rendering tracking and get collected view events
    view_events = DeadBro::ViewRenderingSubscriber.stop_request_tracking
    view_performance = DeadBro::ViewRenderingSubscriber.analyze_view_performance(view_events)

    # Stop memory tracking and get collected memory data
    if DeadBro.configuration.allocation_tracking_enabled && defined?(DeadBro::MemoryTrackingSubscriber)
      detailed_memory = DeadBro::MemoryTrackingSubscriber.stop_request_tracking
      memory_performance = DeadBro::MemoryTrackingSubscriber.analyze_memory_performance(detailed_memory)
      # Keep memory_events compact and user-friendly (no large raw arrays)
      memory_events = {
        memory_before: detailed_memory[:memory_before],
        memory_after: detailed_memory[:memory_after],
        duration_seconds: detailed_memory[:duration_seconds],
        allocations_count: (detailed_memory[:allocations] || []).length,
        memory_snapshots_count: (detailed_memory[:memory_snapshots] || []).length,
        large_objects_count: (detailed_memory[:large_objects] || []).length
      }
    else
      lightweight_memory = DeadBro::LightweightMemoryTracker.stop_request_tracking
      # Separate raw readings from derived performance metrics to avoid duplicating data
      memory_events = {
        memory_before: lightweight_memory[:memory_before],
        memory_after: lightweight_memory[:memory_after]
      }
      memory_performance = {
        memory_growth_mb: lightweight_memory[:memory_growth_mb],
        gc_count_increase: lightweight_memory[:gc_count_increase],
        heap_pages_increase: lightweight_memory[:heap_pages_increase],
        duration_seconds: lightweight_memory[:duration_seconds]
      }
    end

    # Record memory sample for leak detection (only if memory tracking enabled)
    if DeadBro.configuration.memory_tracking_enabled
      DeadBro::MemoryLeakDetector.record_memory_sample({
        memory_usage: memory_usage_mb,
        gc_count: gc_stats[:count],
        heap_pages: gc_stats[:heap_allocated_pages],
        object_count: gc_stats[:heap_live_slots],
        request_id: data[:request_id],
        controller: data[:controller],
        action: data[:action]
      })
    end

    # Report exceptions attached to this action (e.g. controller/view errors)
    if data[:exception] || data[:exception_object]
      begin
        exception_class, exception_message = data[:exception] if data[:exception]
        exception_obj = data[:exception_object]
        backtrace = Array(exception_obj&.backtrace).first(50)

        error_payload = {
          controller: data[:controller],
          action: data[:action],
          format: data[:format],
          method: data[:method],
          path: safe_path(data),
          status: data[:status],
          duration_ms: duration_ms,
          rails_env: DeadBro.env,
          host: safe_host,
          params: safe_params(data),
          user_agent: safe_user_agent(data),
          user_id: extract_user_id(data),
          exception_class: exception_class || exception_obj&.class&.name,
          message: (exception_message || exception_obj&.message).to_s[0, 1000],
          backtrace: backtrace,
          error: true,
          logs: DeadBro.logger.logs
        }

        event_name = (exception_class || exception_obj&.class&.name || "exception").to_s
        client.post_metric(event_name: event_name, payload: error_payload, force: true)
      rescue
      ensure
        next
      end
    end

    payload = {
      controller: data[:controller],
      action: data[:action],
      format: data[:format],
      method: data[:method],
      path: safe_path(data),
      status: data[:status],
      duration_ms: duration_ms,
      view_runtime_ms: data[:view_runtime],
      db_runtime_ms: data[:db_runtime],
      host: safe_host,
      rails_env: DeadBro.env,
      params: safe_params(data),
      user_agent: safe_user_agent(data),
      user_id: extract_user_id(data),
      memory_usage: memory_usage_mb,
      gc_stats: gc_stats,
      sql_count: sql_count(data),
      sql_queries: sql_queries,
      http_outgoing: Thread.current[:dead_bro_http_events] || [],
      cache_events: cache_events,
      redis_events: redis_events,
      elasticsearch_events: elasticsearch_events,
      cache_hits: cache_hits(data),
      cache_misses: cache_misses(data),
      view_events: view_events,
      view_performance: view_performance,
      memory_events: memory_events,
      memory_performance: memory_performance,
      logs: DeadBro.logger.logs
    }
    client.post_metric(event_name: name, payload: payload)
  end
end

.truncate_value(value, max_str: 200, max_array: 20, max_hash_keys: 30) ⇒ Object

Recursively truncate values to reasonable sizes to avoid huge payloads



236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
 
# File 'lib/dead_bro/subscriber.rb', line 236

def self.truncate_value(value, max_str: 200, max_array: 20, max_hash_keys: 30)
  case value
  when String
    (value.length > max_str) ? value[0, max_str] + "…" : value
  when Numeric, TrueClass, FalseClass, NilClass
    value
  when Array
    value[0, max_array].map { |v| truncate_value(v, max_str: max_str, max_array: max_array, max_hash_keys: max_hash_keys) }
  when Hash
    entries = value.to_a[0, max_hash_keys]
    entries.each_with_object({}) do |(k, v), memo|
      memo[k] = truncate_value(v, max_str: max_str, max_array: max_array, max_hash_keys: max_hash_keys)
    end
  else
    (value.to_s.length > max_str) ? value.to_s[0, max_str] + "…" : value.to_s
  end
end