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uuid_pool.go
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uuid_pool.go
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// Copyright 2023 Cisco Systems, Inc. and its affiliates
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package testutils
import (
"bufio"
"fmt"
"github.com/google/uuid"
"io/fs"
)
// UUIDPool hold a list of uuid and make sure same uuid is returned each time Pop is called
type UUIDPool struct {
Pool []uuid.UUID
Current int
}
// Pop return a uuid and increase index by one. This function returns error when index out of bound
func (p *UUIDPool) Pop() (uuid.UUID, error) {
defer func() {p.Current++}()
if p.Current >= len(p.Pool) {
return uuid.Nil, fmt.Errorf("UUID pool exhausted")
}
return p.Pool[p.Current], nil
}
func (p *UUIDPool) PopOrNew() uuid.UUID {
id, e := p.Pop()
if e != nil {
return uuid.New()
}
return id
}
func NewUUIDPool(fsys fs.FS, src string) (*UUIDPool, error) {
f, e := fsys.Open(src)
if e != nil {
return nil, e
}
defer func() {_ = f.Close()}()
scanner := bufio.NewScanner(f)
scanner.Split(bufio.ScanLines)
pool := make([]uuid.UUID, 0, 32)
for scanner.Scan() {
id, e := uuid.Parse(scanner.Text())
if e == nil {
pool = append(pool, id)
}
}
if len(pool) == 0 {
return nil, fmt.Errorf("unable to load UUIDs")
}
return &UUIDPool{
Pool: pool,
}, nil
}