docker-volume-backup/cmd/backup/hooks.go

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// Copyright 2022 - Offen Authors <hioffen@posteo.de>
// SPDX-License-Identifier: MPL-2.0
package main
import (
"errors"
"fmt"
"sort"
)
// hook contains a queued action that can be trigger them when the script
// reaches a certain point (e.g. unsuccessful backup)
type hook struct {
level hookLevel
action func(err error) error
}
type hookLevel int
const (
hookLevelPlumbing hookLevel = iota
hookLevelError
hookLevelInfo
)
var hookLevels = map[string]hookLevel{
"info": hookLevelInfo,
"error": hookLevelError,
}
// registerHook adds the given action at the given level.
func (s *script) registerHook(level hookLevel, action func(err error) error) {
s.hooks = append(s.hooks, hook{level, action})
}
// runHooks runs all hooks that have been registered using the
// given levels in the defined ordering. In case executing a hook returns an
// error, the following hooks will still be run before the function returns.
func (s *script) runHooks(err error) error {
sort.SliceStable(s.hooks, func(i, j int) bool {
return s.hooks[i].level < s.hooks[j].level
})
var actionErrors []error
for _, hook := range s.hooks {
if hook.level > s.hookLevel {
continue
}
if actionErr := hook.action(err); actionErr != nil {
actionErrors = append(actionErrors, fmt.Errorf("runHooks: error running hook: %w", actionErr))
}
}
if len(actionErrors) != 0 {
return errors.Join(actionErrors...)
}
return nil
}