| commit | author | age | ||
| 659253 | 1 | import ipaddress |
| JK | 2 | import random |
| 3 | ||
| 4 | from docker_plugin_api.Plugin import InputValidationException | |
| 5 | ||
| 6 | ||
| 7 | def random_hex(len=4): | |
| 8 | return ''.join(random.choice('0123456789abcdef') for _ in range(len)) | |
| 9 | ||
| 10 | ||
| 11 | class Pool: | |
| 12 | def __init__(self, pool: str = None, options: dict = None, subPool: str = None, v6: bool = None): | |
| 13 | if pool == '': | |
| 14 | pool = None | |
| 15 | if options is None: | |
| 16 | options = {} | |
| 17 | if subPool == '': | |
| 18 | subPool = None | |
| 19 | ||
| 20 | if pool is None and subPool is not None: | |
| 21 | raise InputValidationException('Trying to allocate subPool without pool') | |
| 22 | if pool is None and v6 is None: | |
| 23 | raise InputValidationException('Trying to get random pool without specifying IP version (v6 field)') | |
| 24 | ||
| 25 | if pool is None: | |
| 26 | if subPool is not None: | |
| 27 | raise InputValidationException('Trying to allocate subPool without pool') | |
| 28 | elif v6 is None: | |
| 29 | raise InputValidationException('Trying to get random pool without specifying IP version (v6 field)') | |
| 30 | ||
| 31 | if v6: | |
| 32 | pool = 'fd00:{}:{}:{}::/64'.format(random_hex(), random_hex(), random_hex()) | |
| 33 | else: | |
| 34 | pool = '172.{}.{}.0/24'.format(random.randrange(16, 32), random.randrange(0, 256)) | |
| 35 | ||
| 36 | self.pool = ipaddress.ip_network(pool, strict=False) | |
| 37 | if subPool is not None: | |
| 38 | self.subpool = ipaddress.ip_network(subPool, strict=False) | |
| 39 | else: | |
| 40 | self.subpool = self.pool | |
| 41 | ||
| 42 | if not self.subpool.subnet_of(self.pool): | |
| 43 | raise InputValidationException('Subpool must be a subnet of pool') | |
| 44 | ||
| 45 | self.allocations = set() | |
| 46 | self.current = self.subpool.hosts() | |
| 47 | ||
| 48 | self.v6 = isinstance(self.pool, ipaddress.IPv6Network) | |
| 49 | ||
| 50 | def __eq__(self, pool: 'Pool') -> bool: | |
| 51 | return self.v6 == pool.v6 and self.pool == pool.pool and self.subpool == pool.subpool | |
| 52 | ||
| 53 | def overlaps(self, pool: 'Pool') -> bool: | |
| 54 | if self.v6 != pool.v6: | |
| 55 | raise InputValidationException('Cannot compare v6 and non-v6 pools') | |
| 56 | return self.pool.overlaps(pool.pool) | |
| 57 | ||
| 58 | def _is_allocated(self, address: str): | |
| 59 | return str(address) in self.allocations | |
| 60 | ||
| 61 | def _find_next_address(self): | |
| 62 | for address in self.current: | |
| 63 | if not self._is_allocated(address): | |
| 64 | return address | |
| 65 | self.current = self.subpool.hosts() | |
| 66 | for address in self.current: | |
| 67 | if not self._is_allocated(address): | |
| 68 | return address | |
| 69 | raise InputValidationException('No free addresses in pool') | |
| 70 | ||
| 71 | def allocate(self, address: str = None) -> str: | |
| 72 | if address is None or address == '': | |
| 73 | address = self._find_next_address() | |
| 74 | else: | |
| 75 | address = ipaddress.ip_address(address) | |
| 76 | ||
| 77 | if self.pool.network_address == address: | |
| 78 | raise InputValidationException('Cannot allocate network address to a host') | |
| 79 | if not self.v6 and self.pool.broadcast_address == address: | |
| 80 | raise InputValidationException('Cannot allocate broadcast address to a host') | |
| 81 | if address not in self.pool: | |
| 82 | raise InputValidationException('Requested address does not belong to a pool') | |
| 83 | ||
| 84 | address = str(address) | |
| 85 | if self._is_allocated(address): | |
| 86 | raise InputValidationException('Requested address {} is already used'.format(address)) | |
| 87 | self.allocations.add(address) | |
| 88 | ||
| 89 | return '{}/{}'.format(address, self.pool.prefixlen) | |
| 90 | ||
| 91 | def deallocate(self, address: str): | |
| 92 | address = ipaddress.ip_address(address) | |
| 93 | address = str(address) | |
| 94 | if address in self.allocations: | |
| 95 | self.allocations.remove(address) | |
| 96 | ||
| 97 | def __str__(self): | |
| 98 | return str(self.pool) | |
| 99 | ||
| 100 | ||
| 101 | class Space: | |
| 102 | def __init__(self, name: str): | |
| 103 | self.name = name | |
| 104 | self.pools = {} | |
| 105 | self.pools6 = {} | |
| 106 | ||
| 107 | def add_pool(self, pool: Pool) -> str: | |
| 108 | check = self.pools6 if pool.v6 else self.pools | |
| 109 | for id, p in check.items(): | |
| 110 | if pool == p: | |
| 111 | return id | |
| 112 | if pool.overlaps(p): | |
| 113 | raise InputValidationException('There is already defined pool {} that overlaps this one'.format(id)) | |
| 114 | check[str(pool)] = pool | |
| 115 | return str(pool) | |
| 116 | ||
| 117 | def get_pool(self, pool: str) -> Pool: | |
| 118 | pool = str(pool) | |
| 119 | if pool in self.pools: | |
| 120 | return self.pools[pool] | |
| 121 | elif pool in self.pools6: | |
| 122 | return self.pools6[pool] | |
| 123 | else: | |
| 124 | raise InputValidationException('Unknown pool {}'.format(pool)) | |
| 125 | ||
| 126 | def remove_pool(self, pool: str): | |
| 127 | pool = str(pool) | |
| 128 | if pool in self.pools: | |
| 129 | del self.pools[pool] | |
| 130 | elif pool in self.pools6: | |
| 131 | del self.pools6[pool] | |
| 132 | else: | |
| 133 | raise InputValidationException('Unknown pool {}'.format(pool)) | |
| 134 | ||
| 135 | ||
| 136 | __all__ = ['random_hex', 'Pool', 'Space'] | |
