forked from juju/juju
/
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 uniter
import (
"github.com/juju/errors"
"github.com/juju/utils/clock"
"gopkg.in/juju/names.v2"
"github.com/juju/juju/agent"
"github.com/juju/juju/api"
"github.com/juju/juju/api/uniter"
"github.com/juju/juju/apiserver/params"
"github.com/juju/juju/core/leadership"
"github.com/juju/juju/worker"
"github.com/juju/juju/worker/dependency"
"github.com/juju/juju/worker/fortress"
"github.com/juju/juju/worker/uniter/operation"
)
// ManifoldConfig defines the names of the manifolds on which a
// Manifold will depend.
type ManifoldConfig struct {
AgentName string
APICallerName string
MachineLockName string
Clock clock.Clock
LeadershipTrackerName string
CharmDirName string
HookRetryStrategyName string
}
// Manifold returns a dependency manifold that runs a uniter worker,
// using the resource names defined in the supplied config.
func Manifold(config ManifoldConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{
config.AgentName,
config.APICallerName,
config.LeadershipTrackerName,
config.CharmDirName,
config.HookRetryStrategyName,
},
Start: func(context dependency.Context) (worker.Worker, error) {
if config.Clock == nil {
return nil, errors.NotValidf("missing Clock")
}
if config.MachineLockName == "" {
return nil, errors.NotValidf("missing MachineLockName")
}
// Collect all required resources.
var agent agent.Agent
if err := context.Get(config.AgentName, &agent); err != nil {
return nil, err
}
var apiConn api.Connection
if err := context.Get(config.APICallerName, &apiConn); err != nil {
// TODO(fwereade): absence of an APICaller shouldn't be the end of
// the world -- we ought to return a type that can at least run the
// leader-deposed hook -- but that's not done yet.
return nil, err
}
var leadershipTracker leadership.Tracker
if err := context.Get(config.LeadershipTrackerName, &leadershipTracker); err != nil {
return nil, err
}
var charmDirGuard fortress.Guard
if err := context.Get(config.CharmDirName, &charmDirGuard); err != nil {
return nil, err
}
var hookRetryStrategy params.RetryStrategy
if err := context.Get(config.HookRetryStrategyName, &hookRetryStrategy); err != nil {
return nil, err
}
downloader := api.NewCharmDownloader(apiConn.Client())
manifoldConfig := config
// Configure and start the uniter.
agentConfig := agent.CurrentConfig()
tag := agentConfig.Tag()
unitTag, ok := tag.(names.UnitTag)
if !ok {
return nil, errors.Errorf("expected a unit tag, got %v", tag)
}
uniterFacade := uniter.NewState(apiConn, unitTag)
uniter, err := NewUniter(&UniterParams{
UniterFacade: uniterFacade,
UnitTag: unitTag,
LeadershipTracker: leadershipTracker,
DataDir: agentConfig.DataDir(),
Downloader: downloader,
MachineLockName: manifoldConfig.MachineLockName,
CharmDirGuard: charmDirGuard,
UpdateStatusSignal: NewUpdateStatusTimer(),
HookRetryStrategy: hookRetryStrategy,
NewOperationExecutor: operation.NewExecutor,
Clock: manifoldConfig.Clock,
})
if err != nil {
return nil, errors.Trace(err)
}
return uniter, nil
},
}
}