/
pool_allocator.go
79 lines (65 loc) · 2.18 KB
/
pool_allocator.go
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// Copyright 2019-2020 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package allocator
import (
"fmt"
"net"
"github.com/cilium/cilium/pkg/cidr"
"github.com/cilium/cilium/pkg/ipam/types"
"github.com/cilium/ipam/service/ipallocator"
)
// PoolAllocator is an IP allocator allocating out of a particular CIDR pool
type PoolAllocator struct {
PoolID types.PoolID
AllocationCIDR *cidr.CIDR
allocator *ipallocator.Range
}
// NewPoolAllocator returns a new Allocator
func NewPoolAllocator(poolID types.PoolID, allocationCIDR *cidr.CIDR) (*PoolAllocator, error) {
allocator, err := ipallocator.NewCIDRRange(allocationCIDR.IPNet)
if err != nil {
return nil, fmt.Errorf("unable to create IP allocator: %s", err)
}
return &PoolAllocator{PoolID: poolID, allocator: allocator, AllocationCIDR: allocationCIDR}, nil
}
// Free returns the number of available IPs for allocation
func (s *PoolAllocator) Free() int {
return s.allocator.Free()
}
// Allocate allocates a particular IP
func (s *PoolAllocator) Allocate(ip net.IP) error {
return s.allocator.Allocate(ip)
}
// AllocateMany allocates multiple IP addresses. The operation succeeds if all
// IPs can be allocated. On failure, all IPs are released again.
func (s *PoolAllocator) AllocateMany(num int) ([]net.IP, error) {
ips := make([]net.IP, 0, num)
for i := 0; i < num; i++ {
ip, err := s.allocator.AllocateNext()
if err != nil {
for _, ip = range ips {
s.allocator.Release(ip)
}
return nil, err
}
ips = append(ips, ip)
}
return ips, nil
}
// ReleaseMany releases a slice of IP addresses
func (s *PoolAllocator) ReleaseMany(ips []net.IP) {
for _, ip := range ips {
s.allocator.Release(ip)
}
}