Run all required startup routines and initialization hooks.

def Init():
  """Run all required startup routines and initialization hooks."""
  global INIT_RAN
  if INIT_RAN:
    return

  # Set up a temporary syslog handler so we have somewhere to log problems
  # with ConfigInit() which needs to happen before we can start our create our
  # proper logging setup.
  syslog_logger = logging.getLogger("TempLogger")
  if os.path.exists("/dev/log"):
    handler = logging.handlers.SysLogHandler(address="/dev/log")
  else:
    handler = logging.handlers.SysLogHandler()
  syslog_logger.addHandler(handler)

  try:
    config_lib.SetPlatformArchContext()
    config_lib.ParseConfigCommandLine()
  except config_lib.Error:
    syslog_logger.exception("Died during config initialization")
    raise

  metric_metadata = server_metrics.GetMetadata()
  metric_metadata.extend(communicator.GetMetricMetadata())

  stats_collector = prometheus_stats_collector.PrometheusStatsCollector(
      metric_metadata, registry=prometheus_client.REGISTRY)
  stats_collector_instance.Set(stats_collector)

  server_logging.ServerLoggingStartupInit()

  bs_registry_init.RegisterBlobStores()
  all_decoders.Register()
  all_parsers.Register()
  registry.Init()

  # Exempt config updater from this check because it is the one responsible for
  # setting the variable.
  if not config.CONFIG.ContextApplied("ConfigUpdater Context"):
    if not config.CONFIG.Get("Server.initialized"):
      raise RuntimeError("Config not initialized, run \"grr_config_updater"
                         " initialize\". If the server is already configured,"
                         " add \"Server.initialized: True\" to your config.")

  INIT_RAN = True