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manifold.go
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manifold.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package remoterelations
import (
"github.com/juju/errors"
worker "gopkg.in/juju/worker.v1"
"github.com/juju/juju/agent"
"github.com/juju/juju/api"
"github.com/juju/juju/api/base"
"github.com/juju/juju/worker/dependency"
)
// ManifoldConfig defines the names of the manifolds on which a
// Worker manifold will depend.
type ManifoldConfig struct {
AgentName string
APICallerName string
NewAPIConnForModel api.NewConnectionForModelFunc
NewRemoteRelationsFacade func(base.APICaller) (RemoteRelationsFacade, error)
NewWorker func(Config) (worker.Worker, error)
}
// Validate is called by start to check for bad configuration.
func (config ManifoldConfig) Validate() error {
if config.AgentName == "" {
return errors.NotValidf("empty AgentName")
}
if config.APICallerName == "" {
return errors.NotValidf("empty APICallerName")
}
if config.NewAPIConnForModel == nil {
return errors.NotValidf("nil NewAPIConnForModel")
}
if config.NewRemoteRelationsFacade == nil {
return errors.NotValidf("nil NewRemoteRelationsFacade")
}
if config.NewWorker == nil {
return errors.NotValidf("nil NewWorker")
}
return nil
}
// 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 agent agent.Agent
if err := context.Get(config.AgentName, &agent); err != nil {
return nil, errors.Trace(err)
}
var apiConn api.Connection
if err := context.Get(config.APICallerName, &apiConn); err != nil {
return nil, errors.Trace(err)
}
facade, err := config.NewRemoteRelationsFacade(apiConn)
if err != nil {
return nil, errors.Trace(err)
}
agentConf := agent.CurrentConfig()
apiInfo, ok := agentConf.APIInfo()
if !ok {
return nil, errors.New("no API connection details")
}
apiConnForModelFunc, err := config.NewAPIConnForModel(apiInfo)
if err != nil {
return nil, errors.Trace(err)
}
w, err := config.NewWorker(Config{
ModelUUID: agent.CurrentConfig().Model().Id(),
RelationsFacade: facade,
NewPublisherForModelFunc: relationChangePublisherForModelFunc(apiConnForModelFunc),
})
if err != nil {
return nil, errors.Trace(err)
}
return w, nil
}
// Manifold packages a Worker for use in a dependency.Engine.
func Manifold(config ManifoldConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{
config.AgentName,
config.APICallerName,
},
Start: config.start,
}
}