Class: MemHealth::Middleware

Inherits:
Object
  • Object
show all
Includes:
TrackingConcern
Defined in:
lib/mem_health/middleware.rb

Constant Summary collapse

@@request_count = 
0
@@skipped_requests_count = 
0
@@counter_mutex = 
Mutex.new

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/mem_health/middleware.rb', line 13

def initialize(app)
  @app = app
end

Class Method Details

.redis_tracked_requests_key ⇒ Object 



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# File 'lib/mem_health/middleware.rb', line 9

def self.redis_tracked_requests_key
  "#{MemHealth.configuration.redis_key_prefix}:tracked_requests"
end

.reset_data ⇒ Object 



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# File 'lib/mem_health/middleware.rb', line 51

def self.reset_data
  @@counter_mutex.synchronize do
    @@request_count = 0
    @@skipped_requests_count = 0
  end
  MemHealth.configuration.redis.del(redis_tracked_requests_key)
end

.skipped_requests_count ⇒ Object 



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# File 'lib/mem_health/middleware.rb', line 67

def self.skipped_requests_count
  @@skipped_requests_count
end

.total_requests_count ⇒ Object 



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# File 'lib/mem_health/middleware.rb', line 63

def self.total_requests_count
  @@request_count
end

.tracked_requests_count ⇒ Object 



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# File 'lib/mem_health/middleware.rb', line 59

def self.tracked_requests_count
  MemHealth.configuration.redis.get(redis_tracked_requests_key)&.to_i || 0
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/mem_health/middleware.rb', line 17

def call(env)
  @@counter_mutex.synchronize { @@request_count += 1 }

  request = Rack::Request.new(env)

  status = headers = response = nil
  metrics = measure_memory do
    status, headers, response = @app.call(env)
  end

  # Skip the first few requests as they have large memory jumps due to class loading
  if @@request_count > config.skip_requests
    redis.incr(redis_tracked_requests_key)
    should_track = metrics[:memory_diff] > config.memory_threshold_mb &&
                   metrics[:before] > config.ram_before_threshold_mb

    if should_track
      metadata = {
        url: request.fullpath,
        puma_thread_index: Thread.current[:puma_thread_index],
        dyno: ENV['DYNO'],
        request_method: request.request_method
      }.merge((env))

      track_memory_usage(metrics[:memory_diff], metrics[:before], metrics[:after],
                       metadata.merge(execution_time: metrics[:execution_time]), type: :web)
    end
  else
    @@counter_mutex.synchronize { @@skipped_requests_count += 1 }
  end

  [status, headers, response]
end