forked from juju/juju
/
manifold.go
65 lines (57 loc) · 1.67 KB
/
manifold.go
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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package cleaner
import (
"github.com/juju/clock"
"github.com/juju/errors"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/dependency"
"github.com/DavinZhang/juju/api/base"
"github.com/DavinZhang/juju/api/cleaner"
)
// Logger represents the methods used by the worker to log information.
type Logger interface {
Errorf(string, ...interface{})
}
// ManifoldConfig describes the resources used by the cleanup worker.
type ManifoldConfig struct {
APICallerName string
Clock clock.Clock
Logger Logger
}
// Validate is called by start to check for bad configuration.
func (config ManifoldConfig) Validate() error {
if config.APICallerName == "" {
return errors.NotValidf("empty APICallerName")
}
if config.Clock == nil {
return errors.NotValidf("nil Clock")
}
if config.Logger == nil {
return errors.NotValidf("nil Logger")
}
return nil
}
// Manifold returns a Manifold that encapsulates the cleanup worker.
func Manifold(config ManifoldConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{config.APICallerName},
Start: config.start,
}
}
// start is a StartFunc for a Worker manifold.
func (config ManifoldConfig) start(context dependency.Context) (worker.Worker, error) {
if err := config.Validate(); err != nil {
return nil, errors.Trace(err)
}
var apiCaller base.APICaller
if err := context.Get(config.APICallerName, &apiCaller); err != nil {
return nil, errors.Trace(err)
}
api := cleaner.NewAPI(apiCaller)
w, err := NewCleaner(api, config.Clock, config.Logger)
if err != nil {
return nil, errors.Trace(err)
}
return w, nil
}