mirror of
https://github.com/offen/docker-volume-backup.git
synced 2024-09-19 21:20:28 +02:00
105 lines
2.1 KiB
Go
105 lines
2.1 KiB
Go
// Copyright 2022 - Offen Authors <hioffen@posteo.de>
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// SPDX-License-Identifier: MPL-2.0
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package main
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"sync"
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"time"
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"github.com/offen/docker-volume-backup/internal/errwrap"
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"github.com/robfig/cron/v3"
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)
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var noop = func() error { return nil }
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// remove removes the given file or directory from disk.
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func remove(location string) error {
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fi, err := os.Lstat(location)
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if err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return errwrap.Wrap(err, fmt.Sprintf("error checking for existence of `%s`", location))
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}
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if fi.IsDir() {
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err = os.RemoveAll(location)
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} else {
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err = os.Remove(location)
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}
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if err != nil {
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return errwrap.Wrap(err, fmt.Sprintf("error removing `%s", location))
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}
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return nil
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}
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// buffer takes an io.Writer and returns a wrapped version of the
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// writer that writes to both the original target as well as the returned buffer
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func buffer(w io.Writer) (io.Writer, *bytes.Buffer) {
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buffering := &bufferingWriter{buf: bytes.Buffer{}, writer: w}
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return buffering, &buffering.buf
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}
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type bufferingWriter struct {
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buf bytes.Buffer
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writer io.Writer
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}
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func (b *bufferingWriter) Write(p []byte) (n int, err error) {
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if n, err := b.buf.Write(p); err != nil {
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return n, errwrap.Wrap(err, "error writing to buffer")
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}
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return b.writer.Write(p)
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}
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type noopWriteCloser struct {
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io.Writer
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}
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func (noopWriteCloser) Close() error {
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return nil
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}
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type handledSwarmService struct {
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serviceID string
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initialReplicaCount uint64
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}
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type concurrentSlice[T any] struct {
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val []T
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sync.Mutex
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}
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func (c *concurrentSlice[T]) append(v T) {
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c.Lock()
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defer c.Unlock()
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c.val = append(c.val, v)
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}
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func (c *concurrentSlice[T]) value() []T {
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return c.val
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}
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// checkCronSchedule detects whether the given cron expression will actually
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// ever be executed or not.
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func checkCronSchedule(expression string) (ok bool) {
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defer func() {
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if err := recover(); err != nil {
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ok = false
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}
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}()
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sched, err := cron.ParseStandard(expression)
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if err != nil {
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ok = false
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return
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}
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now := time.Now()
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sched.Next(now) // panics when the cron would never run
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ok = true
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return
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}
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