puma.rb

# Puma can serve each request in a thread from an internal thread pool.
# The `threads` method setting takes two numbers a minimum and maximum.
# Any libraries that use thread pools should be configured to match
# the maximum value specified for Puma. Default is set to 5 threads for minimum
# and maximum, this matches the default thread size of Active Record.
#
threads_count = ENV.fetch('RAILS_MAX_THREADS') { 8 }.to_i
threads threads_count, threads_count

# Specifies the `environment` that Puma will run in.
#
environment = ENV.fetch('RAILS_ENV') { 'development' }
environment environment

app_dir = File.expand_path('../..', __FILE__)
tmp_dir = "#{app_dir}/tmp"

if environment == 'development'
  port ENV.fetch('PORT') { 5000 }
else
  bind "unix://#{tmp_dir}/sockets/puma.sock"
  stdout_redirect "#{app_dir}/log/puma.stdout.log", "#{app_dir}/log/puma.stderr.log", true
  pidfile "#{tmp_dir}/pids/puma.pid"
  state_path "#{tmp_dir}/pids/puma.state"

  activate_control_app
end

on_worker_boot do
  require 'active_record'
  begin
    ActiveRecord::Base.connection.disconnect!
  rescue
    ActiveRecord::ConnectionNotEstablished
  end
  ActiveRecord::Base.establish_connection(YAML.load_file("#{app_dir}/config/database.yml")[rails_env])
end

# Specifies the number of `workers` to boot in clustered mode.
# Workers are forked webserver processes. If using threads and workers together
# the concurrency of the application would be max `threads` * `workers`.
# Workers do not work on JRuby or Windows (both of which do not support
# processes).
#
# workers ENV.fetch("WEB_CONCURRENCY") { 2 }

# Use the `preload_app!` method when specifying a `workers` number.
# This directive tells Puma to first boot the application and load code
# before forking the application. This takes advantage of Copy On Write
# process behavior so workers use less memory. If you use this option
# you need to make sure to reconnect any threads in the `on_worker_boot`
# block.
#
# preload_app!

# The code in the `on_worker_boot` will be called if you are using
# clustered mode by specifying a number of `workers`. After each worker
# process is booted this block will be run, if you are using `preload_app!`
# option you will want to use this block to reconnect to any threads
# or connections that may have been created at application boot, Ruby
# cannot share connections between processes.
#
# on_worker_boot do
#   ActiveRecord::Base.establish_connection if defined?(ActiveRecord)
# end

# Allow puma to be restarted by `rails restart` command.
plugin :tmp_restart