/
manifold.go
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/
manifold.go
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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package provisioner
import (
"github.com/juju/errors"
"github.com/juju/juju/agent"
"github.com/juju/juju/api/base"
apiprovisioner "github.com/juju/juju/api/provisioner"
"github.com/juju/juju/environs"
"github.com/juju/juju/worker"
"github.com/juju/juju/worker/dependency"
)
// ManifoldConfig defines an environment provisioner's dependencies. It's not
// currently clear whether it'll be easier to extend this type to include all
// provisioners, or to create separate (Environ|Container)Manifold[Config]s;
// for now we dodge the question because we don't need container provisioners
// in dependency engines. Yet.
type ManifoldConfig struct {
AgentName string
APICallerName string
EnvironName string
NewProvisionerFunc func(*apiprovisioner.State, agent.Config, environs.Environ) (Provisioner, error)
}
// Manifold creates a manifold that runs an environemnt provisioner. See the
// ManifoldConfig type for discussion about how this can/should evolve.
func Manifold(config ManifoldConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{
config.AgentName,
config.APICallerName,
config.EnvironName,
},
Start: func(context dependency.Context) (worker.Worker, error) {
var agent agent.Agent
if err := context.Get(config.AgentName, &agent); 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 environ environs.Environ
if err := context.Get(config.EnvironName, &environ); err != nil {
return nil, errors.Trace(err)
}
api := apiprovisioner.NewState(apiCaller)
agentConfig := agent.CurrentConfig()
w, err := config.NewProvisionerFunc(api, agentConfig, environ)
if err != nil {
return nil, errors.Trace(err)
}
return w, nil
},
}
}