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# frozen_string_literal: true
module Gitlab
module Metrics
module Samplers
class UnicornSampler < BaseSampler
def initialize(interval)
super(interval)
end
def metrics
@metrics ||= init_metrics
end
def init_metrics
{
unicorn_active_connections: ::Gitlab::Metrics.gauge(:unicorn_active_connections, 'Unicorn active connections', {}, :max),
unicorn_queued_connections: ::Gitlab::Metrics.gauge(:unicorn_queued_connections, 'Unicorn queued connections', {}, :max),
unicorn_workers: ::Gitlab::Metrics.gauge(:unicorn_workers, 'Unicorn workers')
}
end
def enabled?
# Raindrops::Linux.tcp_listener_stats is only present on Linux
unicorn_with_listeners? && Raindrops::Linux.respond_to?(:tcp_listener_stats)
end
def sample
Raindrops::Linux.tcp_listener_stats(tcp_listeners).each do |addr, stats|
set_unicorn_connection_metrics('tcp', addr, stats)
end
Raindrops::Linux.unix_listener_stats(unix_listeners).each do |addr, stats|
set_unicorn_connection_metrics('unix', addr, stats)
end
metrics[:unicorn_workers].set({}, unicorn_workers_count)
end
private
def tcp_listeners
@tcp_listeners ||= Unicorn.listener_names.grep(%r{\A[^/]+:\d+\z})
end
def set_unicorn_connection_metrics(type, addr, stats)
labels = { socket_type: type, socket_address: addr }
metrics[:unicorn_active_connections].set(labels, stats.active)
metrics[:unicorn_queued_connections].set(labels, stats.queued)
end
def unix_listeners
@unix_listeners ||= Unicorn.listener_names - tcp_listeners
end
def unicorn_with_listeners?
defined?(Unicorn) && Unicorn.listener_names.any?
end
def unicorn_workers_count
Sys::ProcTable.ps.select {|p| p.cmdline.match(/unicorn_rails worker.+ #{Rails.root.to_s}/)}.count
end
end
end
end
end
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