File size: 5,350 Bytes
b2e2343 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | from pynamodb.models import Model
from pynamodb.attributes import (UnicodeAttribute, UTCDateTimeAttribute,
NumberAttribute, UnicodeSetAttribute, JSONAttribute)
from datetime import datetime
import logging
import boto.ec2
import boto.exception
import masterdirac.models.systemdefaults as sys_def
#STATES
NA = -10
TERMINATED_WITH_ERROR = -5
INIT = 0
RUN = 10
TERMINATED = 30
logger = logging.getLogger(__name__)
class ANMaster(Model):
class Meta:
region = 'us-east-1'
table_name = 'aurea-nebula-master'
master_name = UnicodeAttribute( hash_key=True )
date_created = UTCDateTimeAttribute(
default=datetime.utcnow() )
aws_region = UnicodeAttribute(default='')
branch = UnicodeAttribute(default='master')
key_pairs = JSONAttribute(default={})
instance_id = UnicodeAttribute(default='')
comm_queue = UnicodeAttribute(default='')
status = NumberAttribute(default=0)
def to_dict( master_item ):
result = {}
result['master_name'] = master_item.master_name
result['date_created'] = master_item.date_created
result['aws_region'] = master_item.aws_region
result['key_pairs'] = master_item.key_pairs
result['instance_id'] = master_item.instance_id
result['comm_queue'] = master_item.comm_queue
result['branch'] = master_item.branch
result['status'] = master_item.status
return result
def get_active_master( branch=None ):
masters = get_master()
for master in masters:
if branch is None or branch == master['branch']:
if master['status'] in [INIT, RUN]:
if confirm_master_active( master ):
return master
else:
update_master( master['master_name'],
status= TERMINATED_WITH_ERROR)
return None
def handle_inconsistent_masters():
masters = get_master()
for master in masters:
_handle_inconsistent_master( master)
def _handle_inconsistent_master( master):
if master['status'] in [INIT, RUN] and not confirm_master_active(master):
logger.error(("Master server with inconsistent status [%r]"
) % ( master ))
try:
update_master( master['master_name'], status= TERMINATED_WITH_ERROR)
logger.error( ("Master server [%s] status changed"
" to TERMINATED_WITH_ERROR") % ( master['master_name'] ) )
except:
logger.exception("Something horrible going on in the db")
def confirm_master_active(master):
try:
conn = boto.ec2.connect_to_region( master['aws_region'] )
for reservation in conn.get_all_reservations(
instance_ids=[master['instance_id']] ):
for inst in reservation.instances:
if (inst.id, inst.state) == (master['instance_id'], 'running'):
return True
except AttributeError as ae:
logger.exception("Unable to connect to [%s] region." % (
master['aws_region'] ))
logger.error("Error attempting to confirm [%r]" % ( master ))
except boto.exception.EC2ResponseError as ec2e:
logger.exception("%s is an invalid instance id in %s region." % (
master['instance_id'], master['aws_region'] ))
logger.error("Error attempting to confirm [%r]" % ( master ))
return False
def get_master( master_name=None):
if master_name is None:
results = []
for item in ANMaster.scan():
results.append( to_dict( item ) )
return results
else:
try:
print "in get_master"
print master_name
item = ANMaster.get( master_name )
return to_dict( item )
except ANMaster.DoesNotExist as dne:
return {}
def update_master( master_name,
aws_region=None,
key_pairs=None,
instance_id = None,
comm_queue = None,
status = None,
branch = None,
**kwargs):
item = ANMaster.get( master_name )
if aws_region is not None:
item.aws_region = aws_region
if key_pairs is not None:
item.key_pairs = key_pairs
if instance_id is not None:
item.instance_id = instance_id
if comm_queue is not None:
item.comm_queue = comm_queue
if status is not None:
item.status = status
if branch is not None:
item.branch = branch
item.save()
return to_dict( item )
def insert_master( master_name,
aws_region=None,
key_pairs=None,
instance_id = None,
comm_queue = None,
status = None,
branch = None,
**kwargs):
item = ANMaster( master_name )
if aws_region is not None:
item.aws_region = aws_region
if key_pairs is not None:
item.key_pairs = key_pairs
if instance_id is not None:
item.instance_id = instance_id
if comm_queue is not None:
item.comm_queue = comm_queue
if status is not None:
item.status = status
if branch is not None:
item.branch = branch
item.save()
return to_dict( item )
if __name__ == "__main__":
if not ANMaster.exists():
print "creaing aurea-nebula-master"
ANMaster.create_table( read_capacity_units=2,
write_capacity_units=1, wait=True )
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