discourse/config/unicorn.conf.rb

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# frozen_string_literal: true
# See http://unicorn.bogomips.org/Unicorn/Configurator.html
if (ENV["LOGSTASH_UNICORN_URI"] || "").length > 0
require_relative '../lib/discourse_logstash_logger'
require_relative '../lib/unicorn_logstash_patch'
logger DiscourseLogstashLogger.logger(uri: ENV['LOGSTASH_UNICORN_URI'], type: :unicorn)
end
discourse_path = File.expand_path(File.expand_path(File.dirname(__FILE__)) + "/../")
# tune down if not enough ram
worker_processes (ENV["UNICORN_WORKERS"] || 3).to_i
working_directory discourse_path
# listen "#{discourse_path}/tmp/sockets/unicorn.sock"
listen ENV["UNICORN_LISTENER"] || "#{(ENV["UNICORN_BIND_ALL"] ? "" : "127.0.0.1:")}#{(ENV["UNICORN_PORT"] || 3000).to_i}"
if !File.exist?("#{discourse_path}/tmp/pids")
FileUtils.mkdir_p("#{discourse_path}/tmp/pids")
end
# feel free to point this anywhere accessible on the filesystem
pid (ENV["UNICORN_PID_PATH"] || "#{discourse_path}/tmp/pids/unicorn.pid")
if ENV["RAILS_ENV"] != "production"
logger Logger.new($stdout)
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# we want a longer timeout in dev cause first request can be really slow
timeout (ENV["UNICORN_TIMEOUT"] && ENV["UNICORN_TIMEOUT"].to_i || 60)
else
# By default, the Unicorn logger will write to stderr.
# Additionally, some applications/frameworks log to stderr or stdout,
# so prevent them from going to /dev/null when daemonized here:
stderr_path "#{discourse_path}/log/unicorn.stderr.log"
stdout_path "#{discourse_path}/log/unicorn.stdout.log"
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# nuke workers after 30 seconds instead of 60 seconds (the default)
timeout 30
end
# important for Ruby 2.0
preload_app true
# Enable this flag to have unicorn test client connections by writing the
# beginning of the HTTP headers before calling the application. This
# prevents calling the application for connections that have disconnected
# while queued. This is only guaranteed to detect clients on the same
# host unicorn runs on, and unlikely to detect disconnects even on a
# fast LAN.
check_client_connection false
initialized = false
before_fork do |server, worker|
unless initialized
Discourse.preload_rails!
# V8 does not support forking, make sure all contexts are disposed
ObjectSpace.each_object(MiniRacer::Context) { |c| c.dispose }
# get rid of rubbish so we don't share it
# longer term we will use compact! here
GC.start
GC.start
GC.start
initialized = true
supervisor = ENV['UNICORN_SUPERVISOR_PID'].to_i
if supervisor > 0
Thread.new do
while true
unless File.exists?("/proc/#{supervisor}")
puts "Kill self supervisor is gone"
Process.kill "TERM", Process.pid
end
sleep 2
end
end
end
sidekiqs = ENV['UNICORN_SIDEKIQS'].to_i
if sidekiqs > 0
server.logger.info "starting #{sidekiqs} supervised sidekiqs"
require 'demon/sidekiq'
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Demon::Sidekiq.after_fork do
DiscourseEvent.trigger(:sidekiq_fork_started)
end
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Demon::Sidekiq.start(sidekiqs)
Signal.trap("SIGTSTP") do
STDERR.puts "#{Time.now}: Issuing stop to sidekiq"
Demon::Sidekiq.stop
end
# Trap USR1, so we can re-issue to sidekiq workers
# but chain the default unicorn implementation as well
old_handler = Signal.trap("USR1") do
Demon::Sidekiq.kill("USR1")
old_handler.call
end
end
if ENV['DISCOURSE_ENABLE_EMAIL_SYNC_DEMON'] == 'true'
server.logger.info "starting up EmailSync demon"
Demon::EmailSync.start
Signal.trap("SIGTSTP") do
STDERR.puts "#{Time.now}: Issuing stop to EmailSync"
Demon::EmailSync.stop
end
end
DiscoursePluginRegistry.demon_processes.each do |demon_class|
server.logger.info "starting #{demon_class.prefix} demon"
demon_class.start
end
class ::Unicorn::HttpServer
alias :master_sleep_orig :master_sleep
def max_sidekiq_rss
rss = `ps -eo rss,args | grep sidekiq | grep -v grep | awk '{print $1}'`
.split("\n")
.map(&:to_i)
.max
rss ||= 0
rss * 1024
end
def max_allowed_sidekiq_rss
[ENV['UNICORN_SIDEKIQ_MAX_RSS'].to_i, 500].max.megabytes
end
def force_kill_rogue_sidekiq
info = `ps -eo pid,rss,args | grep sidekiq | grep -v grep | awk '{print $1,$2}'`
info.split("\n").each do |row|
pid, mem = row.split(" ").map(&:to_i)
if pid > 0 && (mem * 1024) > max_allowed_sidekiq_rss
Rails.logger.warn "Detected rogue Sidekiq pid #{pid} mem #{mem * 1024}, killing"
Process.kill("KILL", pid) rescue nil
end
end
end
def check_sidekiq_heartbeat
@sidekiq_heartbeat_interval ||= 30.minutes
@sidekiq_next_heartbeat_check ||= Time.now.to_i + @sidekiq_heartbeat_interval
if @sidekiq_next_heartbeat_check < Time.now.to_i
last_heartbeat = Jobs::RunHeartbeat.last_heartbeat
restart = false
sidekiq_rss = max_sidekiq_rss
if sidekiq_rss > max_allowed_sidekiq_rss
Rails.logger.warn("Sidekiq is consuming too much memory (using: %0.2fM) for '%s', restarting" % [(sidekiq_rss.to_f / 1.megabyte), ENV["DISCOURSE_HOSTNAME"]])
restart = true
end
if last_heartbeat < Time.now.to_i - @sidekiq_heartbeat_interval
STDERR.puts "Sidekiq heartbeat test failed, restarting"
Rails.logger.warn "Sidekiq heartbeat test failed, restarting"
restart = true
end
@sidekiq_next_heartbeat_check = Time.now.to_i + @sidekiq_heartbeat_interval
if restart
Demon::Sidekiq.restart
sleep 10
force_kill_rogue_sidekiq
end
Discourse.redis.close
end
end
def max_email_sync_rss
return 0 if Demon::EmailSync.demons.empty?
email_sync_pids = Demon::EmailSync.demons.map { |uid, demon| demon.pid }
return 0 if email_sync_pids.empty?
rss = `ps -eo pid,rss,args | grep '#{email_sync_pids.join('|')}' | grep -v grep | awk '{print $2}'`
.split("\n")
.map(&:to_i)
.max
(rss || 0) * 1024
end
def max_allowed_email_sync_rss
[ENV['UNICORN_EMAIL_SYNC_MAX_RSS'].to_i, 500].max.megabytes
end
def check_email_sync_heartbeat
# Skip first check to let process warm up
@email_sync_next_heartbeat_check ||= (Time.now + Demon::EmailSync::HEARTBEAT_INTERVAL).to_i
return if @email_sync_next_heartbeat_check > Time.now.to_i
@email_sync_next_heartbeat_check = (Time.now + Demon::EmailSync::HEARTBEAT_INTERVAL).to_i
restart = false
# Restart process if it does not respond anymore
last_heartbeat_ago = Time.now.to_i - Discourse.redis.get(Demon::EmailSync::HEARTBEAT_KEY).to_i
if last_heartbeat_ago > Demon::EmailSync::HEARTBEAT_INTERVAL.to_i
STDERR.puts("EmailSync heartbeat test failed (last heartbeat was #{last_heartbeat_ago}s ago), restarting")
restart = true
end
# Restart process if memory usage is too high
email_sync_rss = max_email_sync_rss
if email_sync_rss > max_allowed_email_sync_rss
STDERR.puts("EmailSync is consuming too much memory (using: %0.2fM) for '%s', restarting" % [(email_sync_rss.to_f / 1.megabyte), ENV["DISCOURSE_HOSTNAME"]])
restart = true
end
Demon::EmailSync.restart if restart
end
def master_sleep(sec)
sidekiqs = ENV['UNICORN_SIDEKIQS'].to_i
if sidekiqs > 0
Demon::Sidekiq.ensure_running
check_sidekiq_heartbeat
end
if ENV['DISCOURSE_ENABLE_EMAIL_SYNC_DEMON'] == 'true'
Demon::EmailSync.ensure_running
check_email_sync_heartbeat
end
DiscoursePluginRegistry.demon_processes.each do |demon_class|
demon_class.ensure_running
end
master_sleep_orig(sec)
end
end
end
Discourse.redis.close
# Throttle the master from forking too quickly by sleeping. Due
# to the implementation of standard Unix signal handlers, this
# helps (but does not completely) prevent identical, repeated signals
# from being lost when the receiving process is busy.
sleep 1
end
after_fork do |server, worker|
DiscourseEvent.trigger(:web_fork_started)
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# warm up v8 after fork, that way we do not fork a v8 context
# it may cause issues if bg threads in a v8 isolate randomly stop
# working due to fork
Discourse.after_fork
begin
PrettyText.cook("warm up **pretty text**")
rescue => e
Rails.logger.error("Failed to warm up pretty text: #{e}")
end
end