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Add working --last-used-mac

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{'create_vm': False, 'last_used_mac': True, 'get_new_mac': False, 'debug': False, 'conf_dir': '/home/nico/uncloud', 'etcd_host': 'etcd1.ungleich.ch', 'etcd_port': None, 'etcd_ca_cert': '/home/nico/vcs/ungleich-dot-cdist/files/etcd/ca.pem', 'etcd_cert_cert': '/home/nico/vcs/ungleich-dot-cdist/files/etcd/nico.pem', 'etcd_cert_key': '/home/nico/vcs/ungleich-dot-cdist/files/etcd/nico-key.pem'}
00:20:00:00:00:00
(venv) [19:02] diamond:uncloud% ./bin/uncloud-run-reinstall hack  --etcd-host etcd1.ungleich.ch --etcd-ca-cert /home/nico/vcs/ungleich-dot-cdist/files/etcd/ca.pem --etcd-cert-cert /home/nico/vcs/ungleich-dot-cdist/files/etcd/nico.pem --etcd-cert-key /home/nico/vcs/ungleich-dot-cdist/files/etcd/nico-key.pem --last-used-mac
This commit is contained in:
Nico Schottelius 2020-01-14 19:02:15 +01:00
parent 1b36c2f96f
commit 8078ffae5a
4 changed files with 132 additions and 102 deletions
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63
uncloud/hack/db.py
View file

@ -22,30 +22,75 @@
import etcd3
import json
import logging
from functools import wraps
from uncloud import UncloudException
log = logging.getLogger(__name__)
def readable_errors(func):
@wraps(func)
def wrapper(*args, **kwargs):
try:
return func(*args, **kwargs)
except etcd3.exceptions.ConnectionFailedError as e:
raise UncloudException('Cannot connect to etcd: is etcd running and reachable? {}'.format(e))
except etcd3.exceptions.ConnectionTimeoutError as e:
raise UncloudException('etcd connection timeout. {}'.format(e))
return wrapper
class DB(object):
def __init__(self, config):
def __init__(self, config, prefix="/"):
self.config = config
self.prefix= '/nicohack/'
# Root for everything
self.base_prefix= '/nicohack'
# Can be set from outside
self.prefix = prefix
self.connect()
@readable_errors
def connect(self):
self._db_clients = []
for endpoint in self.config.etcd_hosts:
client = etcd3.client(host=endpoint, **self.config.etcd_args)
self._db_clients.append(client)
def get_value(self, key):
pass
def realkey(self, key):
return "{}{}/{}".format(self.base_prefix,
self.prefix,
key)
def set(self, key, value, store_as_json=False, **kwargs):
if store_as_json:
@readable_errors
def get(self, key, as_json=False, **kwargs):
value, _ = self._db_clients[0].get(self.realkey(key), **kwargs)
if as_json:
value = json.loads(value)
return value
@readable_errors
def set(self, key, value, as_json=False, **kwargs):
if as_json:
value = json.dumps(value)
key = "{}/{}".format(self.prefix, key)
# FIXME: iterate over clients in case of failure ?
return self._db_clients[0].put(key, value, **kwargs)
return self._db_clients[0].put(self.realkey(key), value, **kwargs)
@readable_errors
def increment(key, **kwargs):
with self._db_clients[0].lock(key) as lock:
value = int(self.get(self.realkey(key), **kwargs))
self.set(self.realkey(key), str(value + 1), **kwargs)
if __name__ == '__main__':
endpoints = [ "https://etcd1.ungleich.ch:2379",

86
uncloud/hack/mac.py
View file

@ -25,93 +25,65 @@ import logging
import os.path
import os
import re
import json
from uncloud import UncloudException
from uncloud.hack.db import DB
log = logging.getLogger(__name__)
class Error(Exception):
pass
class Mac(object):
def __init__(self):
self.base_dir = "."
class MAC(object):
def __init__(self, config):
self.config = config
self.db = DB(config, prefix="/mac")
self.prefix = 0x002000000000
#self.prefix = "{:012x}".format(self._prefix)
self.free = self.read_file("mac-free")
self.last = self.read_file("mac-last")
def read_file(self, filename):
fname = os.path.join(self.base_dir, filename)
ret = []
try:
with open(fname, "r") as fd:
ret = fd.readlines()
except Exception as e:
pass
return ret
def append_to_file(self, text, filename):
fname = os.path.join(self.base_dir, filename)
with open(fname, "a+") as fd:
fd.write("{}\n".format(text))
@staticmethod
def validate_mac(mac):
if not re.match(r'([0-9A-F]{2}[-:]){5}[0-9A-F]{2}$', mac, re.I):
raise Error("Not a valid mac address: %s" % mac)
def free_append(self, mac):
if mac in self.free:
raise Error("Mac already in free database: %s" % mac)
self.append_to_file(mac, "mac-free")
self.free = self.read_file("mac-free")
def last_used_index(self):
value = self.db.get("last_used_index")
if not value:
return 0
return int(value)
def last_used_mac(self):
return self.int_to_mac(self.prefix + self.last_used_index())
@staticmethod
def int_to_mac(number):
b = number.to_bytes(6, byteorder="big")
return ':'.join(format(s, '02x') for s in b)
def getnext(self):
def get_next(self, vmuuid=None, as_int=False):
# if self.free:
# return self.free.pop()
# if not self.prefix:
# raise Error("Cannot generate address without prefix - use prefix-set")
if self.last:
last_number = int(self.last[0], 16)
last_number = self.last_used_index()
# FIXME: compare to 48bit minus prefix length
if last_number == int('0xffffff', 16):
raise Error("Exhausted all possible mac addresses - try to free some")
raise UncloudException("Exhausted all possible mac addresses - try to free some")
next_number = last_number + 1
else:
next_number = 0
next_number_string = "{:012x}".format(next_number)
next_mac_number = self.prefix + next_number
next_mac = self.int_to_mac(next_mac_number)
with open(os.path.join(self.base_dir, "mac-last"), "w+") as fd:
fd.write("{}\n".format(next_number_string))
db_entry = {}
db_entry['vm_uuid'] = vmuuid
db_entry['index'] = next_number
db_entry['mac_address'] = next_mac
self.db.set("used/{}".format(next_mac),
db_entry)
if as_int:
return next_mac_number
else:
return next_mac
@classmethod
def commandline(cls):
pass
if __name__ == '__main__':
m = Mac()
m.commandline()
# print(m.free)
#print(m.last)
print(m.getnext())

11
uncloud/hack/main.py
View file

@ -2,10 +2,13 @@ import argparse
from uncloud.hack.vm import VM
from uncloud.hack.config import Config
from uncloud.hack.mac import MAC
arg_parser = argparse.ArgumentParser('hack', add_help=False)
#description="Commands that are unfinished - use at own risk")
arg_parser.add_argument('--create-vm', action='store_true')
arg_parser.add_argument('--last-used-mac', action='store_true')
arg_parser.add_argument('--get-new-mac', action='store_true')
def main(arguments):
@ -16,3 +19,11 @@ def main(arguments):
print("Creating VM")
vm = VM(config)
vm.create()
if arguments['last_used_mac']:
m = MAC(config)
print(m.last_used_mac())
if arguments['get_new_mac']:
m = MAC(config).get_next()
print(m.last_used())

20
uncloud/hack/vm.py
View file

@ -25,33 +25,35 @@ import uuid
import os
from uncloud.hack.db import DB
from uncloud.hack.mac import MAC
class VM(object):
def __init__(self, config):
self.config = config
self.db = DB(config)
self.db = DB(config, prefix="/vm")
self.hackprefix="/home/nico/vcs/uncloud/uncloud/hack/hackcloud"
self.qemu="/usr/bin/qemu-system-x86_64"
self.accel="kvm"
self.vm = {}
self.accel="kvm"
# self.mac=$(./mac-gen.py)
self.mac="42:00:00:00:00:42"
self.owner="nico"
self.bridge="br100"
self.ifup = os.path.join(self.hackprefix, "ifup.sh")
self.ifdown = os.path.join(self.hackprefix, "ifdown.sh")
def create(self):
self.uuid = uuid.uuid4()
self.vm['uuid'] = str(self.uuid)
self.vm['memory']=1024
self.vm['cores']=2
self.vm['memory'] = 1024
self.vm['cores'] = 2
self.vm['os_image'] = os.path.join(self.hackprefix, "alpine-virt-3.11.2-x86_64.iso")
self.mac=MAC().next()
self.vm['commandline' ] = [ "sudo",
"{}".format(self.qemu),
"-name", "uncloud-{}".format(self.vm['uuid']),
@ -64,9 +66,9 @@ class VM(object):
"-device", "virtio-net-pci,netdev=netmain,id=net0,mac={}".format(self.mac)
]
def create(self):
self.db.set("vm/{}".format(str(self.vm['uuid'])),
self.vm, store_as_json=True)
self.db.set(str(self.vm['uuid']),
self.vm,
as_json=True)
print(" ".join(self.vm['commandline']))
subprocess.run(self.vm['commandline'])