119 lines
2.7 KiB
Go
119 lines
2.7 KiB
Go
// Copyright (C) 2017 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package config
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/syncthing/syncthing/lib/fs"
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)
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func ParseSize(s string) (Size, error) {
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s = strings.TrimSpace(s)
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if s == "" {
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return Size{}, nil
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}
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var num, unit string
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for i := 0; i < len(s) && (s[i] >= '0' && s[i] <= '9' || s[i] == '.' || s[i] == ','); i++ {
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num = s[:i+1]
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}
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var i = len(num)
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for i < len(s) && s[i] == ' ' {
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i++
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}
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unit = s[i:]
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val, err := strconv.ParseFloat(num, 64)
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if err != nil {
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return Size{}, err
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}
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return Size{val, unit}, nil
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}
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func (s Size) BaseValue() float64 {
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unitPrefix := s.Unit
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if len(unitPrefix) > 1 {
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unitPrefix = unitPrefix[:1]
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}
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mult := 1.0
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switch unitPrefix {
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case "k", "K":
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mult = 1000
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case "m", "M":
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mult = 1000 * 1000
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case "g", "G":
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mult = 1000 * 1000 * 1000
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case "t", "T":
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mult = 1000 * 1000 * 1000 * 1000
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}
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return s.Value * mult
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}
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func (s Size) Percentage() bool {
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return strings.Contains(s.Unit, "%")
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}
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func (s Size) String() string {
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return fmt.Sprintf("%v %s", s.Value, s.Unit)
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}
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func (s *Size) ParseDefault(str string) error {
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sz, err := ParseSize(str)
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*s = sz
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return err
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}
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// CheckFreeSpace checks that the free space does not fall below the minimum required free space.
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func CheckFreeSpace(minFree Size, usage fs.Usage) error {
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val := minFree.BaseValue()
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if val <= 0 {
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return nil
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}
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if minFree.Percentage() {
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freePct := (float64(usage.Free) / float64(usage.Total)) * 100
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if freePct < val {
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return fmt.Errorf("current %.2f %% < required %v", freePct, minFree)
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}
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} else if float64(usage.Free) < val {
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return fmt.Errorf("current %sB < required %v", formatSI(usage.Free), minFree)
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}
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return nil
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}
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// checkAvailableSpace checks that the free space does not fall below the minimum
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// required free space, considering additional required space for a future operation.
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func checkAvailableSpace(req uint64, minFree Size, usage fs.Usage) error {
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if usage.Free < req {
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return fmt.Errorf("current %sB < required %sB", formatSI(usage.Free), formatSI(req))
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}
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usage.Free -= req
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return CheckFreeSpace(minFree, usage)
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}
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func formatSI(b uint64) string {
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switch {
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case b < 1000:
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return fmt.Sprintf("%d ", b)
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case b < 1000*1000:
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return fmt.Sprintf("%.1f K", float64(b)/1000)
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case b < 1000*1000*1000:
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return fmt.Sprintf("%.1f M", float64(b)/(1000*1000))
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case b < 1000*1000*1000*1000:
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return fmt.Sprintf("%.1f G", float64(b)/(1000*1000*1000))
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default:
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return fmt.Sprintf("%.1f T", float64(b)/(1000*1000*1000*1000))
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}
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}
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