sys-info: added helpers for faster loading of sys-info data

rhodecode/lib/system_info.py

@@ -1,797 +1,853 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2017-2020 RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 
 import os
 import sys
 import time
 import platform
 import collections
+from functools import wraps
+
 import pkg_resources
 import logging
 import resource
 
 from pyramid.compat import configparser
 
 log = logging.getLogger(__name__)
 
 
 psutil = None
 
 try:
     # cygwin cannot have yet psutil support.
     import psutil as psutil
 except ImportError:
     pass
 
 
 _NA = 'NOT AVAILABLE'
 
 STATE_OK = 'ok'
 STATE_ERR = 'error'
 STATE_WARN = 'warning'
 
 STATE_OK_DEFAULT = {'message': '', 'type': STATE_OK}
 
 
+registered_helpers = {}
+
+
+def register_sysinfo(func):
+    """
+    @register_helper
+    def db_check():
+        pass
+
+    db_check == registered_helpers['db_check']
+    """
+    global registered_helpers
+    registered_helpers[func.__name__] = func
+
+    @wraps(func)
+    def _wrapper(*args, **kwargs):
+        return func(*args, **kwargs)
+    return _wrapper
+
+
 # HELPERS
 def percentage(part, whole):
     whole = float(whole)
     if whole > 0:
         return round(100 * float(part) / whole, 1)
     return 0.0
 
 
 def get_storage_size(storage_path):
     sizes = []
     for file_ in os.listdir(storage_path):
         storage_file = os.path.join(storage_path, file_)
         if os.path.isfile(storage_file):
             try:
                 sizes.append(os.path.getsize(storage_file))
             except OSError:
                 log.exception('Failed to get size of storage file %s', storage_file)
                 pass
 
     return sum(sizes)
 
 
 def get_resource(resource_type):
     try:
         return resource.getrlimit(resource_type)
     except Exception:
         return 'NOT_SUPPORTED'
 
 
 def get_cert_path(ini_path):
     default = '/etc/ssl/certs/ca-certificates.crt'
     control_ca_bundle = os.path.join(
         os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(ini_path)))),
         '.rccontrol-profile/etc/ca-bundle.crt')
     if os.path.isfile(control_ca_bundle):
         default = control_ca_bundle
 
     return default
 
 
 class SysInfoRes(object):
     def __init__(self, value, state=None, human_value=None):
         self.value = value
         self.state = state or STATE_OK_DEFAULT
         self.human_value = human_value or value
 
     def __json__(self):
         return {
             'value': self.value,
             'state': self.state,
             'human_value': self.human_value,
         }
 
     def get_value(self):
         return self.__json__()
 
     def __str__(self):
         return '<SysInfoRes({})>'.format(self.__json__())
 
 
 class SysInfo(object):
 
     def __init__(self, func_name, **kwargs):
         self.func_name = func_name
         self.value = _NA
         self.state = None
         self.kwargs = kwargs or {}
 
     def __call__(self):
         computed = self.compute(**self.kwargs)
         if not isinstance(computed, SysInfoRes):
             raise ValueError(
                 'computed value for {} is not instance of '
                 '{}, got {} instead'.format(
                     self.func_name, SysInfoRes, type(computed)))
         return computed.__json__()
 
     def __str__(self):
         return '<SysInfo({})>'.format(self.func_name)
 
     def compute(self, **kwargs):
         return self.func_name(**kwargs)
 
 
 # SysInfo functions
+@register_sysinfo
 def python_info():
     value = dict(version=' '.join(platform._sys_version()),
                  executable=sys.executable)
     return SysInfoRes(value=value)
 
 
+@register_sysinfo
 def py_modules():
     mods = dict([(p.project_name, {'version': p.version, 'location': p.location})
                  for p in pkg_resources.working_set])
 
     value = sorted(mods.items(), key=lambda k: k[0].lower())
     return SysInfoRes(value=value)
 
 
+@register_sysinfo
 def platform_type():
     from rhodecode.lib.utils import safe_unicode, generate_platform_uuid
 
     value = dict(
         name=safe_unicode(platform.platform()),
         uuid=generate_platform_uuid()
     )
     return SysInfoRes(value=value)
 
 
+@register_sysinfo
 def locale_info():
     import locale
 
     value = dict(
         locale_default=locale.getdefaultlocale(),
         locale_lc_all=locale.getlocale(locale.LC_ALL),
         lang_env=os.environ.get('LANG'),
         lc_all_env=os.environ.get('LC_ALL'),
         local_archive_env=os.environ.get('LOCALE_ARCHIVE'),
     )
     human_value = 'LANG: {}, locale LC_ALL: {},  Default locales: {}'.format(
         value['lang_env'], value['locale_lc_all'], value['locale_default'])
     return SysInfoRes(value=value, human_value=human_value)
 
 
+@register_sysinfo
 def ulimit_info():
     data = collections.OrderedDict([
         ('cpu time (seconds)', get_resource(resource.RLIMIT_CPU)),
         ('file size', get_resource(resource.RLIMIT_FSIZE)),
         ('stack size', get_resource(resource.RLIMIT_STACK)),
         ('core file size', get_resource(resource.RLIMIT_CORE)),
         ('address space size', get_resource(resource.RLIMIT_AS)),
         ('locked in mem size', get_resource(resource.RLIMIT_MEMLOCK)),
         ('heap size', get_resource(resource.RLIMIT_DATA)),
         ('rss size', get_resource(resource.RLIMIT_RSS)),
         ('number of processes', get_resource(resource.RLIMIT_NPROC)),
         ('open files', get_resource(resource.RLIMIT_NOFILE)),
     ])
 
     text = ', '.join('{}:{}'.format(k, v) for k, v in data.items())
 
     value = {
         'limits': data,
         'text': text,
     }
     return SysInfoRes(value=value)
 
 
+@register_sysinfo
 def uptime():
     from rhodecode.lib.helpers import age, time_to_datetime
     from rhodecode.translation import TranslationString
 
     value = dict(boot_time=0, uptime=0, text='')
     state = STATE_OK_DEFAULT
     if not psutil:
         return SysInfoRes(value=value, state=state)
 
     boot_time = psutil.boot_time()
     value['boot_time'] = boot_time
     value['uptime'] = time.time() - boot_time
 
     date_or_age = age(time_to_datetime(boot_time))
     if isinstance(date_or_age, TranslationString):
         date_or_age = date_or_age.interpolate()
 
     human_value = value.copy()
     human_value['boot_time'] = time_to_datetime(boot_time)
     human_value['uptime'] = age(time_to_datetime(boot_time), show_suffix=False)
 
     human_value['text'] = u'Server started {}'.format(date_or_age)
     return SysInfoRes(value=value, human_value=human_value)
 
 
+@register_sysinfo
 def memory():
     from rhodecode.lib.helpers import format_byte_size_binary
     value = dict(available=0, used=0, used_real=0, cached=0, percent=0,
                  percent_used=0, free=0, inactive=0, active=0, shared=0,
                  total=0, buffers=0, text='')
 
     state = STATE_OK_DEFAULT
     if not psutil:
         return SysInfoRes(value=value, state=state)
 
     value.update(dict(psutil.virtual_memory()._asdict()))
     value['used_real'] = value['total'] - value['available']
     value['percent_used'] = psutil._common.usage_percent(
         value['used_real'], value['total'], 1)
 
     human_value = value.copy()
     human_value['text'] = '%s/%s, %s%% used' % (
         format_byte_size_binary(value['used_real']),
         format_byte_size_binary(value['total']),
         value['percent_used'],)
 
     keys = value.keys()[::]
     keys.pop(keys.index('percent'))
     keys.pop(keys.index('percent_used'))
     keys.pop(keys.index('text'))
     for k in keys:
         human_value[k] = format_byte_size_binary(value[k])
 
     if state['type'] == STATE_OK and value['percent_used'] > 90:
         msg = 'Critical: your available RAM memory is very low.'
         state = {'message': msg, 'type': STATE_ERR}
 
     elif state['type'] == STATE_OK and value['percent_used'] > 70:
         msg = 'Warning: your available RAM memory is running low.'
         state = {'message': msg, 'type': STATE_WARN}
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def machine_load():
     value = {'1_min': _NA, '5_min': _NA, '15_min': _NA, 'text': ''}
     state = STATE_OK_DEFAULT
     if not psutil:
         return SysInfoRes(value=value, state=state)
 
     # load averages
     if hasattr(psutil.os, 'getloadavg'):
         value.update(dict(
             zip(['1_min', '5_min', '15_min'], psutil.os.getloadavg())))
 
     human_value = value.copy()
     human_value['text'] = '1min: {}, 5min: {}, 15min: {}'.format(
         value['1_min'], value['5_min'], value['15_min'])
 
     if state['type'] == STATE_OK and value['15_min'] > 5:
         msg = 'Warning: your machine load is very high.'
         state = {'message': msg, 'type': STATE_WARN}
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def cpu():
     value = {'cpu': 0, 'cpu_count': 0, 'cpu_usage': []}
     state = STATE_OK_DEFAULT
 
     if not psutil:
         return SysInfoRes(value=value, state=state)
 
     value['cpu'] = psutil.cpu_percent(0.5)
     value['cpu_usage'] = psutil.cpu_percent(0.5, percpu=True)
     value['cpu_count'] = psutil.cpu_count()
 
     human_value = value.copy()
     human_value['text'] = '{} cores at {} %'.format(
         value['cpu_count'], value['cpu'])
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def storage():
     from rhodecode.lib.helpers import format_byte_size_binary
     from rhodecode.model.settings import VcsSettingsModel
     path = VcsSettingsModel().get_repos_location()
 
     value = dict(percent=0, used=0, total=0, path=path, text='')
     state = STATE_OK_DEFAULT
     if not psutil:
         return SysInfoRes(value=value, state=state)
 
     try:
         value.update(dict(psutil.disk_usage(path)._asdict()))
     except Exception as e:
         log.exception('Failed to fetch disk info')
         state = {'message': str(e), 'type': STATE_ERR}
 
     human_value = value.copy()
     human_value['used'] = format_byte_size_binary(value['used'])
     human_value['total'] = format_byte_size_binary(value['total'])
     human_value['text'] = "{}/{}, {}% used".format(
         format_byte_size_binary(value['used']),
         format_byte_size_binary(value['total']),
         value['percent'])
 
     if state['type'] == STATE_OK and value['percent'] > 90:
         msg = 'Critical: your disk space is very low.'
         state = {'message': msg, 'type': STATE_ERR}
 
     elif state['type'] == STATE_OK and value['percent'] > 70:
         msg = 'Warning: your disk space is running low.'
         state = {'message': msg, 'type': STATE_WARN}
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def storage_inodes():
     from rhodecode.model.settings import VcsSettingsModel
     path = VcsSettingsModel().get_repos_location()
 
     value = dict(percent=0, free=0, used=0, total=0, path=path, text='')
     state = STATE_OK_DEFAULT
     if not psutil:
         return SysInfoRes(value=value, state=state)
 
     try:
         i_stat = os.statvfs(path)
         value['free'] = i_stat.f_ffree
         value['used'] = i_stat.f_files-i_stat.f_favail
         value['total'] = i_stat.f_files
         value['percent'] = percentage(value['used'], value['total'])
     except Exception as e:
         log.exception('Failed to fetch disk inodes info')
         state = {'message': str(e), 'type': STATE_ERR}
 
     human_value = value.copy()
     human_value['text'] = "{}/{}, {}% used".format(
         value['used'], value['total'], value['percent'])
 
     if state['type'] == STATE_OK and value['percent'] > 90:
         msg = 'Critical: your disk free inodes are very low.'
         state = {'message': msg, 'type': STATE_ERR}
 
     elif state['type'] == STATE_OK and value['percent'] > 70:
         msg = 'Warning: your disk free inodes are running low.'
         state = {'message': msg, 'type': STATE_WARN}
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def storage_archives():
     import rhodecode
     from rhodecode.lib.utils import safe_str
     from rhodecode.lib.helpers import format_byte_size_binary
 
     msg = 'Enable this by setting ' \
           'archive_cache_dir=/path/to/cache option in the .ini file'
     path = safe_str(rhodecode.CONFIG.get('archive_cache_dir', msg))
 
     value = dict(percent=0, used=0, total=0, items=0, path=path, text='')
     state = STATE_OK_DEFAULT
     try:
         items_count = 0
         used = 0
         for root, dirs, files in os.walk(path):
             if root == path:
                 items_count = len(files)
 
             for f in files:
                 try:
                     used += os.path.getsize(os.path.join(root, f))
                 except OSError:
                     pass
         value.update({
             'percent': 100,
             'used': used,
             'total': used,
             'items': items_count
         })
 
     except Exception as e:
         log.exception('failed to fetch archive cache storage')
         state = {'message': str(e), 'type': STATE_ERR}
 
     human_value = value.copy()
     human_value['used'] = format_byte_size_binary(value['used'])
     human_value['total'] = format_byte_size_binary(value['total'])
     human_value['text'] = "{} ({} items)".format(
         human_value['used'], value['items'])
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def storage_gist():
     from rhodecode.model.gist import GIST_STORE_LOC
     from rhodecode.model.settings import VcsSettingsModel
     from rhodecode.lib.utils import safe_str
     from rhodecode.lib.helpers import format_byte_size_binary
     path = safe_str(os.path.join(
         VcsSettingsModel().get_repos_location(), GIST_STORE_LOC))
 
     # gist storage
     value = dict(percent=0, used=0, total=0, items=0, path=path, text='')
     state = STATE_OK_DEFAULT
 
     try:
         items_count = 0
         used = 0
         for root, dirs, files in os.walk(path):
             if root == path:
                 items_count = len(dirs)
 
             for f in files:
                 try:
                     used += os.path.getsize(os.path.join(root, f))
                 except OSError:
                     pass
         value.update({
             'percent': 100,
             'used': used,
             'total': used,
             'items': items_count
         })
     except Exception as e:
         log.exception('failed to fetch gist storage items')
         state = {'message': str(e), 'type': STATE_ERR}
 
     human_value = value.copy()
     human_value['used'] = format_byte_size_binary(value['used'])
     human_value['total'] = format_byte_size_binary(value['total'])
     human_value['text'] = "{} ({} items)".format(
         human_value['used'], value['items'])
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def storage_temp():
     import tempfile
     from rhodecode.lib.helpers import format_byte_size_binary
 
     path = tempfile.gettempdir()
     value = dict(percent=0, used=0, total=0, items=0, path=path, text='')
     state = STATE_OK_DEFAULT
 
     if not psutil:
         return SysInfoRes(value=value, state=state)
 
     try:
         value.update(dict(psutil.disk_usage(path)._asdict()))
     except Exception as e:
         log.exception('Failed to fetch temp dir info')
         state = {'message': str(e), 'type': STATE_ERR}
 
     human_value = value.copy()
     human_value['used'] = format_byte_size_binary(value['used'])
     human_value['total'] = format_byte_size_binary(value['total'])
     human_value['text'] = "{}/{}, {}% used".format(
         format_byte_size_binary(value['used']),
         format_byte_size_binary(value['total']),
         value['percent'])
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def search_info():
     import rhodecode
     from rhodecode.lib.index import searcher_from_config
 
     backend = rhodecode.CONFIG.get('search.module', '')
     location = rhodecode.CONFIG.get('search.location', '')
 
     try:
         searcher = searcher_from_config(rhodecode.CONFIG)
         searcher = searcher.__class__.__name__
     except Exception:
         searcher = None
 
     value = dict(
         backend=backend, searcher=searcher, location=location, text='')
     state = STATE_OK_DEFAULT
 
     human_value = value.copy()
     human_value['text'] = "backend:`{}`".format(human_value['backend'])
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def git_info():
     from rhodecode.lib.vcs.backends import git
     state = STATE_OK_DEFAULT
     value = human_value = ''
     try:
         value = git.discover_git_version(raise_on_exc=True)
         human_value = 'version reported from VCSServer: {}'.format(value)
     except Exception as e:
         state = {'message': str(e), 'type': STATE_ERR}
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def hg_info():
     from rhodecode.lib.vcs.backends import hg
     state = STATE_OK_DEFAULT
     value = human_value = ''
     try:
         value = hg.discover_hg_version(raise_on_exc=True)
         human_value = 'version reported from VCSServer: {}'.format(value)
     except Exception as e:
         state = {'message': str(e), 'type': STATE_ERR}
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def svn_info():
     from rhodecode.lib.vcs.backends import svn
     state = STATE_OK_DEFAULT
     value = human_value = ''
     try:
         value = svn.discover_svn_version(raise_on_exc=True)
         human_value = 'version reported from VCSServer: {}'.format(value)
     except Exception as e:
         state = {'message': str(e), 'type': STATE_ERR}
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def vcs_backends():
     import rhodecode
     value = rhodecode.CONFIG.get('vcs.backends')
     human_value = 'Enabled backends in order: {}'.format(','.join(value))
     return SysInfoRes(value=value, human_value=human_value)
 
 
+@register_sysinfo
 def vcs_server():
     import rhodecode
     from rhodecode.lib.vcs.backends import get_vcsserver_service_data
 
     server_url = rhodecode.CONFIG.get('vcs.server')
     enabled = rhodecode.CONFIG.get('vcs.server.enable')
     protocol = rhodecode.CONFIG.get('vcs.server.protocol') or 'http'
     state = STATE_OK_DEFAULT
     version = None
     workers = 0
 
     try:
         data = get_vcsserver_service_data()
         if data and 'version' in data:
             version = data['version']
 
         if data and 'config' in data:
             conf = data['config']
             workers = conf.get('workers', 'NOT AVAILABLE')
 
         connection = 'connected'
     except Exception as e:
         connection = 'failed'
         state = {'message': str(e), 'type': STATE_ERR}
 
     value = dict(
         url=server_url,
         enabled=enabled,
         protocol=protocol,
         connection=connection,
         version=version,
         text='',
     )
 
     human_value = value.copy()
     human_value['text'] = \
         '{url}@ver:{ver} via {mode} mode[workers:{workers}], connection:{conn}'.format(
             url=server_url, ver=version, workers=workers, mode=protocol,
             conn=connection)
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def vcs_server_config():
     from rhodecode.lib.vcs.backends import get_vcsserver_service_data
     state = STATE_OK_DEFAULT
 
     value = {}
     try:
         data = get_vcsserver_service_data()
         value = data['app_config']
     except Exception as e:
         state = {'message': str(e), 'type': STATE_ERR}
 
     human_value = value.copy()
     human_value['text'] = 'VCS Server config'
 
     return SysInfoRes(value=value, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def rhodecode_app_info():
     import rhodecode
     edition = rhodecode.CONFIG.get('rhodecode.edition')
 
     value = dict(
         rhodecode_version=rhodecode.__version__,
         rhodecode_lib_path=os.path.abspath(rhodecode.__file__),
         text=''
     )
     human_value = value.copy()
     human_value['text'] = 'RhodeCode {edition}, version {ver}'.format(
         edition=edition, ver=value['rhodecode_version']
     )
     return SysInfoRes(value=value, human_value=human_value)
 
 
+@register_sysinfo
 def rhodecode_config():
     import rhodecode
     path = rhodecode.CONFIG.get('__file__')
     rhodecode_ini_safe = rhodecode.CONFIG.copy()
     cert_path = get_cert_path(path)
 
     try:
         config = configparser.ConfigParser()
         config.read(path)
         parsed_ini = config
         if parsed_ini.has_section('server:main'):
             parsed_ini = dict(parsed_ini.items('server:main'))
     except Exception:
         log.exception('Failed to read .ini file for display')
         parsed_ini = {}
 
     rhodecode_ini_safe['server:main'] = parsed_ini
 
     blacklist = [
         'rhodecode_license_key',
         'routes.map',
         'sqlalchemy.db1.url',
         'channelstream.secret',
         'beaker.session.secret',
         'rhodecode.encrypted_values.secret',
         'rhodecode_auth_github_consumer_key',
         'rhodecode_auth_github_consumer_secret',
         'rhodecode_auth_google_consumer_key',
         'rhodecode_auth_google_consumer_secret',
         'rhodecode_auth_bitbucket_consumer_secret',
         'rhodecode_auth_bitbucket_consumer_key',
         'rhodecode_auth_twitter_consumer_secret',
         'rhodecode_auth_twitter_consumer_key',
 
         'rhodecode_auth_twitter_secret',
         'rhodecode_auth_github_secret',
         'rhodecode_auth_google_secret',
         'rhodecode_auth_bitbucket_secret',
 
         'appenlight.api_key',
         ('app_conf', 'sqlalchemy.db1.url')
     ]
     for k in blacklist:
         if isinstance(k, tuple):
             section, key = k
             if section in rhodecode_ini_safe:
                 rhodecode_ini_safe[section] = '**OBFUSCATED**'
         else:
             rhodecode_ini_safe.pop(k, None)
 
     # TODO: maybe put some CONFIG checks here ?
     return SysInfoRes(value={'config': rhodecode_ini_safe,
                              'path': path, 'cert_path': cert_path})
 
 
+@register_sysinfo
 def database_info():
     import rhodecode
     from sqlalchemy.engine import url as engine_url
     from rhodecode.model.meta import Base as sql_base, Session
     from rhodecode.model.db import DbMigrateVersion
 
     state = STATE_OK_DEFAULT
 
     db_migrate = DbMigrateVersion.query().filter(
         DbMigrateVersion.repository_id == 'rhodecode_db_migrations').one()
 
     db_url_obj = engine_url.make_url(rhodecode.CONFIG['sqlalchemy.db1.url'])
 
     try:
         engine = sql_base.metadata.bind
         db_server_info = engine.dialect._get_server_version_info(
             Session.connection(bind=engine))
         db_version = '.'.join(map(str, db_server_info))
     except Exception:
         log.exception('failed to fetch db version')
         db_version = 'UNKNOWN'
 
     db_info = dict(
         migrate_version=db_migrate.version,
         type=db_url_obj.get_backend_name(),
         version=db_version,
         url=repr(db_url_obj)
     )
     current_version = db_migrate.version
     expected_version = rhodecode.__dbversion__
     if state['type'] == STATE_OK and current_version != expected_version:
         msg = 'Critical: database schema mismatch, ' \
               'expected version {}, got {}. ' \
               'Please run migrations on your database.'.format(
             expected_version, current_version)
         state = {'message': msg, 'type': STATE_ERR}
 
     human_value = db_info.copy()
     human_value['url'] = "{} @ migration version: {}".format(
         db_info['url'], db_info['migrate_version'])
     human_value['version'] = "{} {}".format(db_info['type'], db_info['version'])
     return SysInfoRes(value=db_info, state=state, human_value=human_value)
 
 
+@register_sysinfo
 def server_info(environ):
     import rhodecode
     from rhodecode.lib.base import get_server_ip_addr, get_server_port
 
     value = {
         'server_ip': '%s:%s' % (
             get_server_ip_addr(environ, log_errors=False),
             get_server_port(environ)
         ),
         'server_id': rhodecode.CONFIG.get('instance_id'),
     }
     return SysInfoRes(value=value)
 
 
+@register_sysinfo
 def usage_info():
     from rhodecode.model.db import User, Repository
     value = {
         'users': User.query().count(),
         'users_active': User.query().filter(User.active == True).count(),
         'repositories': Repository.query().count(),
         'repository_types': {
             'hg': Repository.query().filter(
                 Repository.repo_type == 'hg').count(),
             'git': Repository.query().filter(
                 Repository.repo_type == 'git').count(),
             'svn': Repository.query().filter(
                 Repository.repo_type == 'svn').count(),
         },
     }
     return SysInfoRes(value=value)
 
 
 def get_system_info(environ):
     environ = environ or {}
     return {
         'rhodecode_app': SysInfo(rhodecode_app_info)(),
         'rhodecode_config': SysInfo(rhodecode_config)(),
         'rhodecode_usage': SysInfo(usage_info)(),
         'python': SysInfo(python_info)(),
         'py_modules': SysInfo(py_modules)(),
 
         'platform': SysInfo(platform_type)(),
         'locale': SysInfo(locale_info)(),
         'server': SysInfo(server_info, environ=environ)(),
         'database': SysInfo(database_info)(),
         'ulimit': SysInfo(ulimit_info)(),
         'storage': SysInfo(storage)(),
         'storage_inodes': SysInfo(storage_inodes)(),
         'storage_archive': SysInfo(storage_archives)(),
         'storage_gist': SysInfo(storage_gist)(),
         'storage_temp': SysInfo(storage_temp)(),
 
         'search': SysInfo(search_info)(),
 
         'uptime': SysInfo(uptime)(),
         'load': SysInfo(machine_load)(),
         'cpu': SysInfo(cpu)(),
         'memory': SysInfo(memory)(),
 
         'vcs_backends': SysInfo(vcs_backends)(),
         'vcs_server': SysInfo(vcs_server)(),
 
         'vcs_server_config': SysInfo(vcs_server_config)(),
 
         'git': SysInfo(git_info)(),
         'hg': SysInfo(hg_info)(),
         'svn': SysInfo(svn_info)(),
     }
+
+
+def load_system_info(key):
+    """
+    get_sys_info('vcs_server')
+    get_sys_info('database')
+    """
+    return SysInfo(registered_helpers[key])()