66 lines
1.9 KiB
Go
66 lines
1.9 KiB
Go
// Copyright (c) 2016-2017 Tigera, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ipam
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import (
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"errors"
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"fmt"
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"github.com/projectcalico/libcalico-go/lib/backend/model"
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cnet "github.com/projectcalico/libcalico-go/lib/net"
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)
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type allocationHandle struct {
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*model.IPAMHandle
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}
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func (h allocationHandle) incrementBlock(blockCidr cnet.IPNet, num int) int {
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blockId := blockCidr.String()
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newNum := num
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if val, ok := h.Block[blockId]; ok {
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// An entry exists for this block, increment the number
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// of allocations.
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newNum = val + num
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}
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h.Block[blockId] = newNum
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return newNum
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}
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func (h allocationHandle) decrementBlock(blockCidr cnet.IPNet, num int) (*int, error) {
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blockId := blockCidr.String()
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if current, ok := h.Block[blockId]; !ok {
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// This entry doesn't exist.
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errStr := fmt.Sprintf("Tried to decrement block %s by %v but it isn't linked to handle %s", blockId, num, h.HandleID)
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return nil, errors.New(errStr)
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} else {
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newNum := current - num
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if newNum < 0 {
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errStr := fmt.Sprintf("Tried to decrement block %s by %v but it only has %v addresses on handle %s", blockId, num, current, h.HandleID)
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return nil, errors.New(errStr)
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}
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if newNum == 0 {
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delete(h.Block, blockId)
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} else {
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h.Block[blockId] = newNum
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}
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return &newNum, nil
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}
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}
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func (h allocationHandle) empty() bool {
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return len(h.Block) == 0
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}
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