root / snf-cyclades-app / synnefo / logic / ips.py @ 3c96580c
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import logging |
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from snf_django.lib.api import faults |
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from django.db import transaction |
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from synnefo import quotas |
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from synnefo.db import pools |
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from synnefo.db.models import (IPPoolTable, IPAddress) |
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log = logging.getLogger(__name__) |
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def allocate_ip_from_pools(pool_rows, userid, address=None, floating_ip=False): |
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"""Try to allocate a value from a number of pools.
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This function takes as argument a number of PoolTable objects and tries to
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allocate a value from them. If all pools are empty EmptyPool is raised.
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If an address is specified and does not belong to any of the pools,
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InvalidValue is raised.
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"""
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for pool_row in pool_rows: |
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pool = pool_row.pool |
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try:
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value = pool.get(value=address) |
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pool.save() |
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subnet = pool_row.subnet |
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ipaddress = IPAddress.objects.create(subnet=subnet, |
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network=subnet.network, |
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userid=userid, |
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address=value, |
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floating_ip=floating_ip) |
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return ipaddress
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except pools.EmptyPool:
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pass
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except pools.InvalidValue:
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pass
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if address is None: |
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raise pools.EmptyPool("No more IP addresses available on pools %s" % |
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pool_rows) |
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else:
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raise pools.InvalidValue("Address %s does not belong to pools %s" % |
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(address, pool_rows)) |
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def allocate_ip(network, userid, address=None, floating_ip=False): |
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"""Try to allocate an IP from networks IP pools."""
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if network.action == "DESTROY": |
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raise faults.Conflict("Can not allocate IP. Network %s is being" |
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" deleted" % network.id)
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ip_pools = IPPoolTable.objects.select_for_update()\ |
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.filter(subnet__network=network) |
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try:
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return allocate_ip_from_pools(ip_pools, userid, address=address,
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floating_ip=floating_ip) |
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except pools.EmptyPool:
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raise faults.Conflict("No more IP addresses available on network %s" |
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% network.id) |
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except pools.ValueNotAvailable:
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raise faults.Conflict("IP address %s is already used." % address) |
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except pools.InvalidValue:
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raise faults.BadRequest("Address %s does not belong to network %s" % |
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(address, network.id)) |
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def allocate_public_ip(userid, floating_ip=False, backend=None): |
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"""Try to allocate a public or floating IP address.
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Try to allocate a a public IPv4 address from one of the available networks.
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If 'floating_ip' is set, only networks which are floating IP pools will be
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used and the IPAddress that will be created will be marked as a floating
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IP. If 'backend' is set, only the networks that exist in this backend will
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be used.
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"""
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ip_pool_rows = IPPoolTable.objects.select_for_update()\ |
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.prefetch_related("subnet__network")\
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.filter(subnet__deleted=False)\
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.filter(subnet__network__deleted=False)\
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.filter(subnet__network__public=True)\
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.filter(subnet__network__drained=False)
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if floating_ip:
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ip_pool_rows = ip_pool_rows\ |
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.filter(subnet__network__floating_ip_pool=True)
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if backend is not None: |
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ip_pool_rows = ip_pool_rows\ |
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.filter(subnet__network__backend_networks__backend=backend) |
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try:
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return allocate_ip_from_pools(ip_pool_rows, userid,
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floating_ip=floating_ip) |
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except pools.EmptyPool:
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ip_type = "floating" if floating_ip else "public" |
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log_msg = "Failed to allocate a %s IP. Reason:" % ip_type
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if ip_pool_rows:
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log_msg += " No network exists."
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else:
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log_msg += " All network are full."
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if backend is not None: |
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log_msg += " Backend: %s" % backend
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log.error(log_msg) |
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exception_msg = "Can not allocate a %s IP address." % ip_type
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if floating_ip:
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raise faults.Conflict(exception_msg)
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else:
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raise faults.ServiceUnavailable(exception_msg)
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@transaction.commit_on_success
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def create_floating_ip(userid, network=None, address=None): |
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if network is None: |
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floating_ip = allocate_public_ip(userid, floating_ip=True)
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else:
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if not network.floating_ip_pool: |
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msg = ("Can not allocate floating IP. Network %s is"
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" not a floating IP pool.")
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raise faults.Conflict(msg % network.id)
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if network.action == "DESTROY": |
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msg = "Can not allocate floating IP. Network %s is being deleted."
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raise faults.Conflict(msg % network.id)
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# Allocate the floating IP
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floating_ip = allocate_ip(network, userid, address=address, |
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floating_ip=True)
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# Issue commission (quotas)
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quotas.issue_and_accept_commission(floating_ip) |
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transaction.commit() |
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log.info("Created floating IP '%s' for user IP '%s'", floating_ip, userid)
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return floating_ip
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@transaction.commit_on_success
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def delete_floating_ip(floating_ip): |
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if floating_ip.nic:
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# This is safe, you also need for_update to attach floating IP to
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# instance.
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msg = "Floating IP '%s' is attached to instance." % floating_ip.id
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raise faults.Conflict(msg)
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# Return the address of the floating IP back to pool
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floating_ip.release_address() |
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# And mark the floating IP as deleted
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floating_ip.deleted = True
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floating_ip.save() |
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# Release quota for floating IP
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quotas.issue_and_accept_commission(floating_ip, delete=True)
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transaction.commit() |
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# Delete the floating IP from DB
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log.info("Deleted floating IP '%s' of user '%s", floating_ip,
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floating_ip.userid) |
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floating_ip.delete() |