services/nodemanager/arvnodeman/config.py

   1 #!/usr/bin/env python
   2
   3 from __future__ import absolute_import, print_function
   4
   5 import ConfigParser
   6 import importlib
   7 import logging
   8 import sys
   9
  10 import arvados
  11 import httplib2
  12 import pykka
  13 from apiclient import errors as apierror
  14
  15 from .baseactor import BaseNodeManagerActor
  16
  17 # IOError is the base class for socket.error, ssl.SSLError, and friends.
  18 # It seems like it hits the sweet spot for operations we want to retry:
  19 # it's low-level, but unlikely to catch code bugs.
  20 NETWORK_ERRORS = (IOError,)
  21 ARVADOS_ERRORS = NETWORK_ERRORS + (apierror.Error,)
  22
  23 actor_class = BaseNodeManagerActor
  24
  25 class NodeManagerConfig(ConfigParser.SafeConfigParser):
  26     """Node Manager Configuration class.
  27
  28     This a standard Python ConfigParser, with additional helper methods to
  29     create objects instantiated with configuration information.
  30     """
  31
  32     LOGGING_NONLEVELS = frozenset(['file'])
  33
  34     def __init__(self, *args, **kwargs):
  35         # Can't use super() because SafeConfigParser is an old-style class.
  36         ConfigParser.SafeConfigParser.__init__(self, *args, **kwargs)
  37         for sec_name, settings in {
  38             'Arvados': {'insecure': 'no',
  39                         'timeout': '15'},
  40             'Daemon': {'min_nodes': '0',
  41                        'max_nodes': '1',
  42                        'poll_time': '60',
  43                        'max_poll_time': '300',
  44                        'poll_stale_after': '600',
  45                        'max_total_price': '0',
  46                        'boot_fail_after': str(sys.maxint),
  47                        'node_stale_after': str(60 * 60 * 2),
  48                        'watchdog': '600',
  49                        'node_mem_scaling': '0.95'},
  50             'Logging': {'file': '/dev/stderr',
  51                         'level': 'WARNING'},
  52         }.iteritems():
  53             if not self.has_section(sec_name):
  54                 self.add_section(sec_name)
  55             for opt_name, value in settings.iteritems():
  56                 if not self.has_option(sec_name, opt_name):
  57                     self.set(sec_name, opt_name, value)
  58
  59     def get_section(self, section, transformer=None):
  60         result = self._dict()
  61         for key, value in self.items(section):
  62             if transformer is not None:
  63                 try:
  64                     value = transformer(value)
  65                 except (TypeError, ValueError):
  66                     pass
  67             result[key] = value
  68         return result
  69
  70     def log_levels(self):
  71         return {key: getattr(logging, self.get('Logging', key).upper())
  72                 for key in self.options('Logging')
  73                 if key not in self.LOGGING_NONLEVELS}
  74
  75     def dispatch_classes(self):
  76         mod_name = 'arvnodeman.computenode.dispatch'
  77         if self.has_option('Daemon', 'dispatcher'):
  78             mod_name = '{}.{}'.format(mod_name,
  79                                       self.get('Daemon', 'dispatcher'))
  80         module = importlib.import_module(mod_name)
  81         return (module.ComputeNodeSetupActor,
  82                 module.ComputeNodeShutdownActor,
  83                 module.ComputeNodeUpdateActor,
  84                 module.ComputeNodeMonitorActor)
  85
  86     def new_arvados_client(self):
  87         if self.has_option('Daemon', 'certs_file'):
  88             certs_file = self.get('Daemon', 'certs_file')
  89         else:
  90             certs_file = None
  91         insecure = self.getboolean('Arvados', 'insecure')
  92         http = httplib2.Http(timeout=self.getint('Arvados', 'timeout'),
  93                              ca_certs=certs_file,
  94                              disable_ssl_certificate_validation=insecure)
  95         return arvados.api(version='v1',
  96                            host=self.get('Arvados', 'host'),
  97                            token=self.get('Arvados', 'token'),
  98                            insecure=insecure,
  99                            http=http)
 100
 101     def new_cloud_client(self):
 102         module = importlib.import_module('arvnodeman.computenode.driver.' +
 103                                          self.get('Cloud', 'provider'))
 104         auth_kwargs = self.get_section('Cloud Credentials')
 105         if 'timeout' in auth_kwargs:
 106             auth_kwargs['timeout'] = int(auth_kwargs['timeout'])
 107         return module.ComputeNodeDriver(auth_kwargs,
 108                                         self.get_section('Cloud List'),
 109                                         self.get_section('Cloud Create'))
 110
 111     def node_sizes(self, all_sizes):
 112         """Finds all acceptable NodeSizes for our installation.
 113
 114         Returns a list of (NodeSize, kwargs) pairs for each NodeSize object
 115         returned by libcloud that matches a size listed in our config file.
 116         """
 117
 118         size_kwargs = {}
 119         for sec_name in self.sections():
 120             sec_words = sec_name.split(None, 2)
 121             if sec_words[0] != 'Size':
 122                 continue
 123             size_spec = self.get_section(sec_name, int)
 124             if 'price' in size_spec:
 125                 size_spec['price'] = float(size_spec['price'])
 126             size_kwargs[sec_words[1]] = size_spec
 127         # EC2 node sizes are identified by id. GCE sizes are identified by name.
 128         matching_sizes = []
 129         for size in all_sizes:
 130             if size.id in size_kwargs:
 131                 matching_sizes.append((size, size_kwargs[size.id]))
 132             elif size.name in size_kwargs:
 133                 matching_sizes.append((size, size_kwargs[size.name]))
 134         return matching_sizes
 135
 136     def shutdown_windows(self):
 137         return [int(n)
 138                 for n in self.get('Cloud', 'shutdown_windows').split(',')]