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  • Committer: Nicholas Skaggs
  • Date: 2016-10-24 20:56:05 UTC
  • Revision ID: nicholas.skaggs@canonical.com-20161024205605-z8lta0uvuhtxwzwl
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src/github.com/juju/juju/worker/undertaker/manifold.go
 
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// Copyright 2016 Canonical Ltd.
 
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// Licensed under the AGPLv3, see LICENCE file for details.
 
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package undertaker
 
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import (
 
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        "github.com/juju/errors"
 
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        "github.com/juju/juju/api/base"
 
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        "github.com/juju/juju/environs"
 
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        "github.com/juju/juju/worker"
 
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        "github.com/juju/juju/worker/dependency"
 
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)
 
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// ManifoldConfig holds the names of the resources used by, and the
 
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// additional dependencies of, an undertaker worker.
 
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type ManifoldConfig struct {
 
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        APICallerName string
 
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        EnvironName   string
 
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        NewFacade func(base.APICaller) (Facade, error)
 
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        NewWorker func(Config) (worker.Worker, error)
 
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}
 
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func (config ManifoldConfig) start(context dependency.Context) (worker.Worker, error) {
 
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        var apiCaller base.APICaller
 
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        if err := context.Get(config.APICallerName, &apiCaller); err != nil {
 
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                return nil, errors.Trace(err)
 
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        }
 
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        var environ environs.Environ
 
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        if err := context.Get(config.EnvironName, &environ); err != nil {
 
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                return nil, errors.Trace(err)
 
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        }
 
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        facade, err := config.NewFacade(apiCaller)
 
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        if err != nil {
 
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                return nil, errors.Trace(err)
 
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        }
 
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        worker, err := config.NewWorker(Config{
 
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                Facade:  facade,
 
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                Environ: environ,
 
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        })
 
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        if err != nil {
 
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                return nil, errors.Trace(err)
 
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        }
 
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        return worker, nil
 
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}
 
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// Manifold returns a dependency.Manifold that runs a worker responsible
 
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// for shepherding a Dying model into Dead and ultimate removal.
 
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func Manifold(config ManifoldConfig) dependency.Manifold {
 
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        return dependency.Manifold{
 
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                Inputs: []string{
 
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                        config.APICallerName,
 
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                        config.EnvironName,
 
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                },
 
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                Start: config.start,
 
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        }
 
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}