/
cleaner.go
47 lines (37 loc) · 1.12 KB
/
cleaner.go
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// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package cleaner
import (
"github.com/juju/loggo"
"github.com/juju/juju/api/watcher"
"github.com/juju/juju/worker"
)
var logger = loggo.GetLogger("juju.worker.cleaner")
type StateCleaner interface {
Cleanup() error
WatchCleanups() (watcher.NotifyWatcher, error)
}
// Cleaner is responsible for cleaning up the state.
type Cleaner struct {
st StateCleaner
}
// NewCleaner returns a worker.Worker that runs state.Cleanup()
// if the CleanupWatcher signals documents marked for deletion.
func NewCleaner(st StateCleaner) worker.Worker {
return worker.NewNotifyWorker(&Cleaner{st})
}
func (c *Cleaner) SetUp() (watcher.NotifyWatcher, error) {
return c.st.WatchCleanups()
}
func (c *Cleaner) Handle(_ <-chan struct{}) error {
if err := c.st.Cleanup(); err != nil {
logger.Errorf("cannot cleanup state: %v", err)
}
// We do not return the err from Cleanup, because we don't want to stop
// the loop as a failure
return nil
}
func (c *Cleaner) TearDown() error {
// Nothing to cleanup, only state is the watcher
return nil
}