github.com/niedbalski/juju@v0.0.0-20190215020005-8ff100488e47/worker/machineactions/manifold.go (about)

     1  // Copyright 2016 Canonical Ltd.
     2  // Copyright 2016 Cloudbase Solutions SRL
     3  // Licensed under the AGPLv3, see LICENCE file for details.
     4  
     5  package machineactions
     6  
     7  import (
     8  	"github.com/juju/errors"
     9  	"gopkg.in/juju/names.v2"
    10  	"gopkg.in/juju/worker.v1"
    11  	"gopkg.in/juju/worker.v1/dependency"
    12  
    13  	"github.com/juju/juju/agent"
    14  	"github.com/juju/juju/api/base"
    15  	"github.com/juju/juju/cmd/jujud/agent/engine"
    16  )
    17  
    18  // ManifoldConfig describes the dependencies of a machine action runner.
    19  type ManifoldConfig struct {
    20  	AgentName     string
    21  	APICallerName string
    22  
    23  	NewFacade func(base.APICaller) Facade
    24  	NewWorker func(WorkerConfig) (worker.Worker, error)
    25  }
    26  
    27  // start is used by engine.AgentAPIManifold to create a StartFunc.
    28  func (config ManifoldConfig) start(a agent.Agent, apiCaller base.APICaller) (worker.Worker, error) {
    29  	machineTag, ok := a.CurrentConfig().Tag().(names.MachineTag)
    30  	if !ok {
    31  		return nil, errors.Errorf("this manifold can only be used inside a machine")
    32  	}
    33  	machineActionsFacade := config.NewFacade(apiCaller)
    34  	return config.NewWorker(WorkerConfig{
    35  		Facade:       machineActionsFacade,
    36  		MachineTag:   machineTag,
    37  		HandleAction: HandleAction,
    38  	})
    39  }
    40  
    41  // Manifold returns a dependency.Manifold as configured.
    42  func Manifold(config ManifoldConfig) dependency.Manifold {
    43  	typedConfig := engine.AgentAPIManifoldConfig{
    44  		AgentName:     config.AgentName,
    45  		APICallerName: config.APICallerName,
    46  	}
    47  	return engine.AgentAPIManifold(typedConfig, config.start)
    48  }