Module: DeadBro::Collectors::ProcessInfo

Defined in:
lib/dead_bro/collectors/process_info.rb

Overview

ProcessInfo collector exposes Ruby / Rails / process level metrics such as RSS, thread count, file descriptor count, GC stats and uptime.

All methods are best-effort and will return nil on failure rather than raising exceptions.

Class Method Summary collapse

Class Method Details

.collect ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 16

def collect
  now = Time.now.utc

  {
    kind: DeadBro.process_kind,
    pid: Process.pid,
    hostname: DeadBro.safe_hostname,
    boot_time: rails_boot_time,
    uptime_s: uptime_seconds(now),
    ruby_version: RUBY_VERSION,
    rails_version: safe_rails_version,
    app_env: DeadBro.env,
    rss_bytes: rss_bytes,
    thread_count: thread_count,
    fd_count: fd_count,
    gc: gc_stats
  }
rescue => e
  {
    error_class: e.class.name,
    error_message: e.message.to_s[0, 500]
  }
end

.fd_count ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 143

def fd_count
  if linux? && File.directory?("/proc/self/fd")
    Dir.entries("/proc/self/fd").size - 2 # exclude . and ..
  elsif macos? && File.directory?("/dev/fd")
    Dir.entries("/dev/fd").size - 2
  else
    # Best-effort: count file descriptors under /proc when available
    nil
  end
rescue
  nil
end

.gc_stats ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 156

def gc_stats
  return {} unless defined?(GC) && GC.respond_to?(:stat)

  stats = GC.stat
  {
    heap_live_slots: stats[:heap_live_slots],
    heap_free_slots: stats[:heap_free_slots],
    total_allocated_objects: stats[:total_allocated_objects],
    major_gc_count: stats[:major_gc_count],
    minor_gc_count: stats[:minor_gc_count]
  }
rescue
  {}
end

.linux? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dead_bro/collectors/process_info.rb', line 40

def linux?
  host_os = RbConfig::CONFIG["host_os"].to_s.downcase
  host_os.include?("linux")
rescue
  false
end

.macos? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dead_bro/collectors/process_info.rb', line 47

def macos?
  host_os = RbConfig::CONFIG["host_os"].to_s.downcase
  host_os.include?("darwin")
rescue
  false
end

.parse_proc_status_for_rss(path) ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 97

def parse_proc_status_for_rss(path)
  File.foreach(path) do |line|
    next unless line.start_with?("VmRSS:")

    parts = line.split
    value_kb = begin
      Integer(parts[1])
    rescue
      nil
    end
    return value_kb * 1024 if value_kb
  end
  nil
rescue
  nil
end

.process_start_time ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 67

def process_start_time
  @process_start_time ||= Time.now.utc
end

.rails_boot_time ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 54

def rails_boot_time
  return nil unless defined?(Rails)

  if Rails.respond_to?(:application) && Rails.application.respond_to?(:config)
    # Rails does not expose boot time directly; approximate with process start
    process_start_time
  else
    process_start_time
  end
rescue
  nil
end

.rss_bytes ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 87

def rss_bytes
  if linux? && File.readable?("/proc/self/status")
    parse_proc_status_for_rss("/proc/self/status")
  else
    rss_from_ps
  end
rescue
  nil
end

.rss_from_ps ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 114

def rss_from_ps
  rss_kb = `ps -o rss= -p #{Process.pid}`.to_i
  return nil if rss_kb <= 0

  rss_kb * 1024
rescue
  nil
end

.safe_rails_version ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 77

def safe_rails_version
  if defined?(Rails) && Rails.respond_to?(:version)
    Rails.version
  elsif defined?(Rails::VERSION) && Rails::VERSION::STRING
    Rails::VERSION::STRING
  end
rescue
  nil
end

.thread_count ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 123

def thread_count
  if linux? && File.readable?("/proc/self/status")
    File.foreach("/proc/self/status") do |line|
      next unless line.start_with?("Threads:")

      parts = line.split
      begin
        return Integer(parts[1])
      rescue
        nil
      end
    end
    nil
  else
    Thread.list.size
  end
rescue
  nil
end

.uptime_seconds(now = Time.now.utc) ⇒ Object 



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# File 'lib/dead_bro/collectors/process_info.rb', line 71

def uptime_seconds(now = Time.now.utc)
  (now.to_f - process_start_time.to_f).round(2)
rescue
  nil
end