172 lines
3.2 KiB
Go
172 lines
3.2 KiB
Go
/*
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* Copyright 2020 The Dragonfly Authors
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*
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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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*/
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package unit
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import (
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"encoding/json"
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"errors"
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"fmt"
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"regexp"
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"strconv"
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"gopkg.in/yaml.v3"
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pkgstrings "d7y.io/dragonfly/v2/pkg/strings"
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)
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type Bytes int64
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const (
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B Bytes = 1
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KB = 1024 * B
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MB = 1024 * KB
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GB = 1024 * MB
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TB = 1024 * GB
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PB = 1024 * TB
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EB = 1024 * PB
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)
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func (f Bytes) ToNumber() int64 {
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return int64(f)
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}
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func ToBytes(size int64) Bytes {
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return Bytes(size)
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}
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// Set is used for command flag var
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func (f *Bytes) Set(s string) (err error) {
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if pkgstrings.IsBlank(s) {
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*f = 0
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} else {
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*f, err = parseSize(s)
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}
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return
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}
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func (f Bytes) Type() string {
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return "bytes"
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}
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func (f Bytes) String() string {
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var (
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symbol string
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unit Bytes
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)
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if f >= PB {
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symbol = "PB"
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unit = PB
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} else if f >= TB {
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symbol = "TB"
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unit = TB
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} else if f >= GB {
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symbol = "GB"
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unit = GB
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} else if f >= MB {
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symbol = "MB"
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unit = MB
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} else if f >= KB {
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symbol = "KB"
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unit = KB
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} else {
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symbol = "B"
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unit = B
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}
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return fmt.Sprintf("%.1f%s", float64(f)/float64(unit), symbol)
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}
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var sizeRegexp = regexp.MustCompile(`^([0-9]+)(\.0*)?([MmKkGgTtPpEe])?[iI]?[bB]?$`)
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func parseSize(fsize string) (Bytes, error) {
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if pkgstrings.IsBlank(fsize) {
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return 0, nil
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}
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matches := sizeRegexp.FindStringSubmatch(fsize)
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if len(matches) == 0 {
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return 0, fmt.Errorf("parse size %s: invalid format", fsize)
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}
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var unit Bytes
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switch matches[3] {
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case "k", "K":
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unit = KB
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case "m", "M":
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unit = MB
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case "g", "G":
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unit = GB
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case "t", "T":
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unit = TB
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case "p", "P":
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unit = PB
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case "e", "E":
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unit = EB
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default:
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unit = B
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}
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num, err := strconv.ParseInt(matches[1], 0, 64)
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if err != nil {
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return 0, fmt.Errorf("failed to parse size %s: %w", fsize, err)
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}
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return ToBytes(num) * unit, nil
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}
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func (f Bytes) MarshalYAML() (any, error) {
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result := f.String()
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return result, nil
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}
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func (f *Bytes) UnmarshalJSON(b []byte) error {
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return f.unmarshal(json.Unmarshal, b)
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}
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func (f *Bytes) UnmarshalYAML(node *yaml.Node) error {
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return f.unmarshal(yaml.Unmarshal, []byte(node.Value))
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}
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func (f *Bytes) unmarshal(unmarshal func(in []byte, out any) (err error), b []byte) error {
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var v any
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if err := unmarshal(b, &v); err != nil {
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return err
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}
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switch value := v.(type) {
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case float64:
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*f = Bytes(int64(value))
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return nil
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case int:
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*f = Bytes(int64(value))
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return nil
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case int64:
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*f = Bytes(value)
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return nil
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case string:
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size, err := parseSize(value)
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if err != nil {
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return fmt.Errorf("invalid byte size: %w", err)
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}
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*f = size
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return nil
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default:
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return errors.New("invalid byte size")
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}
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}
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