/
manifold.go
101 lines (88 loc) · 2.43 KB
/
manifold.go
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// Copyright 2021 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package caasmodelconfigmanager
import (
"github.com/juju/clock"
"github.com/juju/errors"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/dependency"
"github.com/juju/juju/api/base"
"github.com/juju/juju/caas"
"github.com/juju/juju/docker/registry"
)
// ManifoldConfig describes how to configure and construct a Worker,
// and what registered resources it may depend upon.
type ManifoldConfig struct {
APICallerName string
BrokerName string
NewFacade func(base.APICaller) (Facade, error)
NewWorker func(Config) (worker.Worker, error)
Logger Logger
Clock clock.Clock
}
// 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.BrokerName == "" {
return errors.NotValidf("empty BrokerName")
}
if config.NewFacade == nil {
return errors.NotValidf("nil NewFacade")
}
if config.NewWorker == nil {
return errors.NotValidf("nil NewWorker")
}
if config.Logger == nil {
return errors.NotValidf("nil Logger")
}
if config.Clock == nil {
return errors.NotValidf("nil Clock")
}
return nil
}
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)
}
var broker caas.Broker
if err := context.Get(config.BrokerName, &broker); err != nil {
return nil, errors.Trace(err)
}
modelTag, ok := apiCaller.ModelTag()
if !ok {
return nil, errors.New("API connection is controller-only (should never happen)")
}
facade, err := config.NewFacade(apiCaller)
if err != nil {
return nil, errors.Trace(err)
}
worker, err := config.NewWorker(Config{
ModelTag: modelTag,
Facade: facade,
Broker: broker,
Logger: config.Logger,
RegistryFunc: registry.New,
Clock: config.Clock,
})
if err != nil {
return nil, errors.Trace(err)
}
return worker, nil
}
// Manifold returns a dependency.Manifold that will run a Worker as
// configured.
func Manifold(config ManifoldConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{
config.APICallerName,
config.BrokerName,
},
Start: config.start,
}
}