88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
/*
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Copyright 2022 Alibaba Group Holding Limited.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package meta
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import (
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"errors"
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"fmt"
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"path"
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"sort"
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"strconv"
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"strings"
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)
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var (
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ErrInvalidBinaryLogFilenameFormat = errors.New("invalid binlog filename format")
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)
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// ParseBinaryLogFileName parses the binlog filename into two parts: basename and index.
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// It returns an error if the filename does not obey the format.
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func ParseBinaryLogFileName(filename string) (string, int, error) {
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dotIndex := strings.LastIndexByte(filename, '.')
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if dotIndex < 0 {
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return "", 0, ErrInvalidBinaryLogFilenameFormat
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}
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basename, suffix := filename[:dotIndex], filename[dotIndex+1:]
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index, err := strconv.Atoi(suffix)
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if err != nil {
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return "", 0, ErrInvalidBinaryLogFilenameFormat
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}
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return basename, index, nil
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}
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type BinlogFile struct {
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File string
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Basename string
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Index int
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}
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func (f *BinlogFile) FileName() string {
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return path.Base(f.File)
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}
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func (f *BinlogFile) String() string {
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return fmt.Sprintf("%s.%06d", f.Basename, f.Index)
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}
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func ParseBinlogFile(file string) (BinlogFile, error) {
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filename := path.Base(file)
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basename, index, err := ParseBinaryLogFileName(filename)
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if err != nil {
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return BinlogFile{}, err
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}
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return BinlogFile{File: file, Basename: basename, Index: index}, nil
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}
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func ParseBinlogFilesAndSortByIndex(files ...string) ([]BinlogFile, error) {
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// Parse filenames.
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parsed := make([]BinlogFile, len(files))
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var err error
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for i, filename := range files {
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parsed[i], err = ParseBinlogFile(filename)
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if err != nil {
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return nil, fmt.Errorf("failed to parse filename: %w", err)
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}
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}
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sort.Slice(parsed, func(i, j int) bool {
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a, b := &parsed[i], &parsed[j]
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return a.Index < b.Index
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})
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return parsed, nil
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}
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