<s> import boto <EOL> import logging <EOL> import random <EOL> import re <EOL> import requests <EOL> import neti . constants as constants <EOL> from ipaddress import AddressValueError , IPv4Address , IPv4Network <EOL> from kazoo . client import KazooClient , KazooState <EOL> from kazoo . exceptions import NodeExistsError , NoNodeError , ZookeeperError <EOL> from kazoo . recipe . party import ShallowParty <EOL> from kazoo . recipe . watchers import ChildrenWatch <EOL> from neti import __version__ as version <EOL> from neti . exceptions import IPPatternMismatchError , MetadataError , NoAvailableIPsError <EOL> from neti . iptables import IPtables <EOL> logger = logging . getLogger ( '<STR_LIT>' ) <EOL> kazoo_logger = logging . getLogger ( '<STR_LIT>' ) <EOL> class Connection ( object ) : <EOL> def __init__ ( self , config , dry_run = False ) : <EOL> if self . _is_vpc : <EOL> self . zk_hosts = config [ "<STR_LIT>" ] [ "<STR_LIT>" ] <EOL> else : <EOL> self . zk_hosts = config [ "<STR_LIT>" ] [ "<STR_LIT>" ] <EOL> self . zk = KazooClient ( hosts = "<STR_LIT:U+002C>" . join ( self . zk_hosts ) , timeout = constants . ZK_TIMEOUT , logger = kazoo_logger ) <EOL> self . aws_access_key_id = config [ "<STR_LIT>" ] <EOL> self . aws_secret_access_key = config [ "<STR_LIT>" ] <EOL> self . overlay_subnet = config [ "<STR_LIT>" ] <EOL> self . network = IPv4Network ( unicode ( self . overlay_subnet ) ) <EOL> self . instance_id = self . _get_instance_id ( ) <EOL> self . public_ip = self . _get_public_ip ( ) <EOL> self . private_ip = self . _get_private_ip ( ) <EOL> try : <EOL> self . zk . start ( ) <EOL> self . connected = True <EOL> self . lost = False <EOL> except self . zk . handler . timeout_exception : <EOL> logger . error ( "<STR_LIT>" ) <EOL> def _get_metadata ( self , path ) : <EOL> if not path : <EOL> raise "<STR_LIT>" <EOL> res = requests . get ( "<STR_LIT>" % ( constants . METADATA_URL , path ) ) <EOL> if res . status_code == <NUM_LIT:200> : <EOL> return str ( res . text ) <EOL> else : <EOL> raise MetadataError ( "<STR_LIT>" % path ) <EOL> @ property <EOL> def _is_vpc ( self ) : <EOL> try : <EOL> self . _get_metadata ( constants . VPCID_PATH % self . _get_mac ( ) ) <EOL> return True <EOL> except MetadataError : <EOL> return False <EOL> def _get_mac ( self ) : <EOL> return self . _get_metadata ( constants . MAC_PATH ) <EOL> def _get_instance_id ( self ) : <EOL> return self . _get_metadata ( constants . INSTANCE_ID_PATH ) <EOL> def _get_public_ip ( self ) : <EOL> try : <EOL> return self . _get_metadata ( constants . PUBLIC_ADDRESS_PATH ) <EOL> except MetadataError : <EOL> return self . _get_metadata ( constants . VPC_PUBLIC_ADDRESS_PATH % self . _get_mac ( ) ) <EOL> def _get_private_ip ( self ) : <EOL> return self . _get_metadata ( constants . PRIVATE_ADDRESS_PATH ) <EOL> def tag_instance ( self , data ) : <EOL> try : <EOL> ec2 = boto . connect_ec2 ( aws_access_key_id = self . aws_access_key_id , aws_secret_access_key = self . aws_secret_access_key ) <EOL> if not ec2 . create_tags ( [ self . instance_id ] , data ) : <EOL> logger . error ( "<STR_LIT>" % data ) <EOL> except boto . exception . BotoServerError , e : <EOL> logger . error ( "<STR_LIT>" % e ) <EOL> class Registry ( object ) : <EOL> def __init__ ( self , config , conn , dry_run = False ) : <EOL> self . config = config <EOL> self . zk_prefix = self . config [ "<STR_LIT>" ] <EOL> self . zk_iptoid_path = "<STR_LIT>" % ( self . zk_prefix , self . config [ "<STR_LIT>" ] ) <EOL> self . zk_idtoip_path = "<STR_LIT>" % ( self . zk_prefix , self . config [ "<STR_LIT>" ] ) <EOL> self . zk_ip_map_path = "<STR_LIT>" % ( self . zk_prefix , self . config [ "<STR_LIT>" ] ) <EOL> self . zk_max_change_threshold_path = "<STR_LIT>" % ( self . zk_prefix , self . config [ "<STR_LIT>" ] ) <EOL> self . conn = conn <EOL> self . dry_run = dry_run <EOL> @ property <EOL> def _zk_id_path ( self ) : <EOL> """<STR_LIT>""" <EOL> return "<STR_LIT>" % ( self . zk_idtoip_path , self . conn . instance_id ) <EOL> def _zk_ip_path ( self , ip ) : <EOL> """<STR_LIT>""" <EOL> return "<STR_LIT>" % ( self . zk_iptoid_path , ip ) <EOL> def _tag_instance ( self ) : <EOL> """<STR_LIT>""" <EOL> self . conn . tag_instance ( { "<STR_LIT>" : self . overlay_ip , "<STR_LIT>" : version } ) <EOL> def _choose_overlay_ip ( self ) : <EOL> """<STR_LIT>""" <EOL> try : <EOL> used_ips = { IPv4Address ( unicode ( ip ) ) for ip in self . conn . zk . get_children ( self . zk_iptoid_path ) } <EOL> except NoNodeError : <EOL> used_ips = set ( ) <EOL> available_ips = set ( self . conn . network . hosts ( ) ) - used_ips <EOL> if not available_ips : <EOL> logger . error ( "<STR_LIT>" ) <EOL> raise NoAvailableIPsError <EOL> return str ( random . sample ( available_ips , <NUM_LIT:1> ) [ <NUM_LIT:0> ] ) <EOL> def _find_available_overlay_ip ( self ) : <EOL> """<STR_LIT>""" <EOL> retries = <NUM_LIT:0> <EOL> ip = self . _choose_overlay_ip ( ) <EOL> while retries < constants . MAX_IP_TRIES : <EOL> retries += <NUM_LIT:1> <EOL> try : <EOL> self . conn . zk . create ( self . _zk_id_path , ip ) <EOL> logger . warn ( "<STR_LIT>" % ip ) <EOL> except NoNodeError : <EOL> self . conn . zk . ensure_path ( self . zk_idtoip_path ) <EOL> logger . error ( "<STR_LIT>" % self . zk_idtoip_path ) <EOL> continue <EOL> except NodeExistsError : <EOL> try : <EOL> zk_ip , _ = self . conn . zk . get ( self . _zk_id_path ) <EOL> logger . error ( "<STR_LIT>" % ( zk_ip , self . conn . instance_id ) ) <EOL> except NoNodeError : <EOL> logger . error ( "<STR_LIT>" ) <EOL> continue <EOL> return zk_ip <EOL> try : <EOL> zk_ip , _ = self . conn . zk . get ( self . _zk_id_path ) <EOL> except NoNodeError : <EOL> logger . error ( "<STR_LIT>" % ip ) <EOL> continue <EOL> if zk_ip == ip : <EOL> logger . info ( "<STR_LIT>" % ip ) <EOL> return ip <EOL> else : <EOL> logger . error ( "<STR_LIT>" % ( zk_ip , self . conn . instance_id ) ) <EOL> return zk_ip <EOL> logger . error ( "<STR_LIT>" ) <EOL> raise NoAvailableIPsError <EOL> def _set_ip_to_id_map ( self , ip ) : <EOL> """<STR_LIT>""" <EOL> try : <EOL> self . conn . zk . set ( self . _zk_ip_path ( ip ) , self . conn . instance_id ) <EOL> except NoNodeError : <EOL> logger . info ( "<STR_LIT>" % ip ) <EOL> try : <EOL> self . conn . zk . create ( self . _zk_ip_path ( ip ) , self . conn . instance_id ) <EOL> except NoNodeError : <EOL> self . conn . zk . ensure_path ( self . _zk_ip_path ( ip ) ) <EOL> self . _set_ip_to_id_map ( ip ) <EOL> def register ( self ) : <EOL> """<STR_LIT>""" <EOL> try : <EOL> self . overlay_ip , _ = self . conn . zk . get ( self . _zk_id_path ) <EOL> except NoNodeError : <EOL> self . overlay_ip = self . _find_available_overlay_ip ( ) <EOL> self . conn . zk . handler . spawn ( self . _tag_instance ) <EOL> self . _set_ip_to_id_map ( self . overlay_ip ) <EOL> return self . overlay_ip <EOL> def _get_ip_map ( self ) : <EOL> """<STR_LIT>""" <EOL> return "<STR_LIT>" % ( self . conn . public_ip , self . conn . private_ip , self . overlay_ip , self . conn . _is_vpc ) <EOL> def _ips_from_entries ( self , entries ) : <EOL> """<STR_LIT>""" <EOL> ips = [ ] <EOL> for entry in entries : <EOL> ips . append ( InstanceIPBundle ( entry ) ) <EOL> return ips <EOL> def _join_party ( self ) : <EOL> self . party = ShallowParty ( self . conn . zk , self . zk_ip_map_path , identifier = self . _get_ip_map ( ) ) <EOL> self . party . join ( ) <EOL> def _load_param ( self , path , default ) : <EOL> try : <EOL> param , _ = self . conn . zk . retry ( self . conn . zk . get , path ) <EOL> return int ( param ) if param else default <EOL> except NoNodeError : <EOL> self . conn . zk . ensure_path ( path ) <EOL> self . conn . zk . retry ( self . conn . zk . set , ( path , str ( default ) ) ) <EOL> return default <EOL> def _state_listener ( self , state ) : <EOL> logger . error ( "<STR_LIT>" % state ) <EOL> if state == KazooState . SUSPENDED : <EOL> logger . warn ( "<STR_LIT>" ) <EOL> self . conn . connected = False <EOL> elif state == KazooState . LOST : <EOL> logger . warn ( "<STR_LIT>" ) <EOL> self . conn . lost = True <EOL> self . conn . zk . handler . spawn ( self . _rejoin_party ) <EOL> elif state == KazooState . CONNECTED : <EOL> logger . warn ( "<STR_LIT>" ) <EOL> self . conn . connected = True <EOL> self . conn . zk . handler . spawn ( self . _rejoin_party ) <EOL> def _rejoin_party ( self ) : <EOL> logger . warn ( "<STR_LIT>" % ( self . conn . lost , self . conn . connected ) ) <EOL> if self . conn . lost and self . conn . connected : <EOL> logger . warn ( "<STR_LIT>" ) <EOL> self . _join_party ( ) <EOL> self . conn . lost = False <EOL> def run ( self ) : <EOL> """<STR_LIT>""" <EOL> try : <EOL> self . _join_party ( ) <EOL> self . conn . zk . add_listener ( self . _state_listener ) <EOL> @ ThrottledChildrenWatch ( self . conn . zk , self . zk_ip_map_path , delay_min = constants . TIME_DELAY_MIN , delay_max = constants . TIME_DELAY_MAX ) <EOL> def update_iptables ( hosts ) : <EOL> self . max_change_threshold = self . _load_param ( self . zk_max_change_threshold_path , constants . DEFAULT_MAX_CHANGE_THRESHOLD ) <EOL> if getattr ( self , "<STR_LIT>" , None ) : <EOL> hosts_to_remove = len ( self . hosts ) - len ( hosts ) <EOL> if hosts_to_remove > self . max_change_threshold : <EOL> logger . warn ( "<STR_LIT>" % ( hosts_to_remove , self . max_change_threshold ) ) <EOL> return <EOL> else : <EOL> remove = set ( self . hosts ) - set ( hosts ) <EOL> add = set ( hosts ) - set ( self . hosts ) <EOL> if add : <EOL> logger . debug ( "<STR_LIT>" % add ) <EOL> if remove : <EOL> logger . debug ( "<STR_LIT>" % remove ) <EOL> self . hosts = hosts <EOL> bundles = self . _ips_from_entries ( self . hosts ) <EOL> builder = IPtables ( config = self . config , is_vpc = self . conn . _is_vpc , dry_run = self . dry_run ) <EOL> builder . build ( bundles ) <EOL> while True : <EOL> self . conn . zk . handler . sleep_func ( constants . DEFAULT_SLEEP ) <EOL> except ZookeeperError as e : <EOL> logger . error ( "<STR_LIT>" % e ) <EOL> self . run ( ) <EOL> class ThrottledChildrenWatch ( ChildrenWatch ) : <EOL> def __init__ ( self , * args , ** kwargs ) : <EOL> self . delay_min = kwargs . pop ( "<STR_LIT>" , constants . TIME_DELAY_MIN ) <EOL> self . delay_max = kwargs . pop ( "<STR_LIT>" , constants . TIME_DELAY_MAX ) <EOL> super ( ThrottledChildrenWatch , self ) . __init__ ( * args , ** kwargs ) <EOL> self . triggered = False <EOL> def _watcher ( self , event ) : <EOL> logger . debug ( "<STR_LIT>" ) <EOL> if not self . triggered : <EOL> try : <EOL> time_to_wait = random . randint ( self . delay_min , self . delay_max ) <EOL> logger . debug ( "<STR_LIT>" % time_to_wait ) <EOL> self . triggered = True <EOL> self . _client . handler . sleep_func ( time_to_wait ) <EOL> self . _get_children ( event ) <EOL> finally : <EOL> self . triggered = False <EOL> return <EOL> class InstanceIPBundle ( object ) : <EOL> """<STR_LIT>""" <EOL> uuid_delim = "<STR_LIT:->" <EOL> ip_delim = "<STR_LIT:|>" <EOL> ip_labels = [ "<STR_LIT>" , "<STR_LIT>" , "<STR_LIT>" ] <EOL> def __init__ ( self , entry ) : <EOL> self . entry = entry <EOL> self . _parse_entry ( ) <EOL> def NAT_ips ( self , is_vpc ) : <EOL> """<STR_LIT>""" <EOL> ips = { "<STR_LIT>" : self . overlay_ip } <EOL> ips [ "<STR_LIT>" ] = self . private_ip if is_vpc == int ( self . is_vpc ) else self . public_ip <EOL> return ips <EOL> def filter_ip ( self , is_vpc ) : <EOL> """<STR_LIT>""" <EOL> if is_vpc == int ( self . is_vpc ) : <EOL> return self . private_ip <EOL> return self . public_ip <EOL> def _parse_entry ( self ) : <EOL> """<STR_LIT>""" <EOL> try : <EOL> _ , ip_string = self . entry . split ( self . uuid_delim ) <EOL> except ValueError : <EOL> logger . error ( "<STR_LIT>" % self . entry ) <EOL> raise IPPatternMismatchError ( self . entry ) <EOL> binary_check = re . compile ( '<STR_LIT>' ) <EOL> try : <EOL> self . is_vpc = ip_string . rsplit ( self . ip_delim , <NUM_LIT:1> ) [ <NUM_LIT:1> ] <EOL> except ValueError : <EOL> logger . error ( "<STR_LIT>" % self . entry ) <EOL> raise IPPatternMismatchError ( self . entry ) <EOL> if not binary_check . match ( self . is_vpc ) : <EOL> raise IPPatternMismatchError ( self . entry ) <EOL> try : <EOL> ips = dict ( zip ( self . ip_labels , ip_string . split ( self . ip_delim ) ) ) <EOL> except ValueError : <EOL> logger . error ( "<STR_LIT>" % self . entry ) <EOL> raise IPPatternMismatchError ( self . entry ) <EOL> if len ( ips ) != len ( self . ip_labels ) : <EOL> logger . error ( "<STR_LIT>" % self . entry ) <EOL> raise IPPatternMismatchError ( self . entry ) <EOL> for label , ip in ips . iteritems ( ) : <EOL> try : <EOL> IPv4Network ( unicode ( ip ) ) <EOL> except AddressValueError : <EOL> logger . error ( "<STR_LIT>" % ( label , ip ) ) <EOL> raise IPPatternMismatchError ( self . entry ) <EOL> else : <EOL> setattr ( self , label , ip ) </s>
