You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: manifold.go
    path of file: ./repos/juju/worker/caasoperator
    
    the code of the file until where you have to start completion: // Copyright 2017 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.

package caasoperator

import (
	"crypto/tls"
	"encoding/pem"
	"os"
	"path"
	"time"

	"github.com/juju/clock"
	"github.com/juju/errors"
	"github.com/juju/http/v2"
	"github.com/juju/loggo"
	"github.com/juju/names/v5"
	"github.com/juju/worker/v3"
	"github.com/juju/worker/v3/dependency"

	"github.com/juju/juju/agent"
	apileadership "github.com/juju/juju/api/agent/leadership"
	"github.com/juju/juju/api/agent/secretsmanager"
	apiuniter "github.com/juju/juju/api/agent/uniter"
	"github.com/juju/juju/api/base"
	"github.com/juju/juju/caas"
	caasconstants "github.com/juju/juju/caas/kubernetes/provider/constants"
	"github.com/juju/juju/caas/kubernetes/provider/exec"
	coreleadership "github.com/juju/juju/core/leadership"
	"github.com/juju/juju/core/machinelock"
	"github.com/juju/juju/juju/sockets"
	"github.com/juju/juju/rpc/params"
	"github.com/juju/juju/secrets"
	"github.com/juju/juju/worker/fortress"
	"github.com/juju/juju/worker/leadership"
	"github.com/juju/juju/worker/secretexpire"
	"github.com/juju/juju/worker/secr
    
func Manifold(config ManifoldConfig) dependency.Manifold {
	return dependency.Manifold{
		Inputs: []string{
			config.AgentName,
			config.APICallerName,
			config.ClockName,
			config.CharmDirName,
			config.HookRetryStrategyName,
		},
		Start: func(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 apiCaller base.APICaller
			if err := context.Get(config.APICallerName, &apiCaller); err != nil {
				return nil, errors.Trace(err)
			}
			client := config.NewClient(apiCaller)
			downloader := config.NewCharmDownloader(apiCaller)

			var clock clock.Clock
			if err := context.Get(config.ClockName, &clock); err != nil {
				return nil, errors.Trace(err)
			}

			model, err := client.Model()
			if err != nil {
				return nil, errors.Trace(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
			}

			// Configure and start the caasoperator worker.
			agentConfig := agent.CurrentConfig()
			tag := agentConfig.Tag()
			applicationTag, ok := tag.(names.ApplicationTag)
			if !ok {
				return nil, errors.Errorf("expected an application tag, got %v", tag)
			}
			newUniterFunc := func(unitTag names.UnitTag) *apiuniter.State {
				return apiuniter.NewState(apiCaller, unitTag)
			}
			newResourcesFacadeFunc := func(unitTag names.UnitTag) (*apiuniter.ResourcesFacadeClient, error) {
				return apiuniter.NewResourcesFacadeClient(apiCaller, unitTag)
			}
			newPayloadFacadeFunc := func() *apiuniter.PayloadFacadeClient {
				return apiuniter.NewPayloadFacadeClient(apiCaller)
			}
			leadershipTrackerFunc := func(unitTag names.UnitTag) coreleadership.TrackerWorker {
				claimer := apileadership.NewClient(apiCaller)
				return leadership.NewTracker(unitTag, claimer, clock, config.LeadershipGuarantee)
			}

			runListenerSocketFunc := config.RunListenerSocket
			if runListenerSocketFunc == nil {
				runListenerSocketFunc = runListenerSocket
			}
			containerStartWatcherClient := config.NewContainerStartWatcherClient
			if containerStartWatcherClient == nil {
				containerStartWatcherClient = func(c Client) ContainerStartWatcher {
					return c
				}
			}
			jujuSecretsAPI := secretsmanager.NewClient(apiCaller)
			secretsBackendGetter := func() (secrets.BackendsClient, error) {
				return secrets.NewClient(jujuSecretsAPI)
			}
			secretRotateWatcherFunc := func(unitTag names.UnitTag, isLeader bool, rotateSecrets chan []string) (worker.Worker, error) {
				owners := []names.Tag{unitTag}
				if isLeader {
					appName, _ := names.UnitApplication(unitTag.Id())
					owners = append(owners, names.NewApplicationTag(appName))
				}
				return secretrotate.New(secretrotate.Config{
					SecretManagerFacade: jujuSecretsAPI,
					Clock:               clock,
					Logger:              config.Logger.Child("secretsrotate"),
					SecretOwners:        owners,
					RotateSecrets:       rotateSecrets,
				})
			}
			secretExpiryWatcherFunc := func(unitTag names.UnitTag, isLeader bool, expireRevisions chan []string) (worker.Worker, error) {
				owners := []names.Tag{unitTag}
				if isLeader {
					appName, _ := names.UnitApplication(unitTag.Id())
					owners = append(owners, names.NewApplicationTag(appName))
				}
				return secretexpire.New(secretexpire.Config{
					SecretManagerFacade: jujuSecretsAPI,
					Clock:               clock,
					Logger:              config.Logger.Child("secretsexpire"),
					SecretOwners:        owners,
					ExpireRevisions:     expireRevisions,
				})
			}

			wCfg := Config{
				Logger:                config.Logger,
				ModelUUID:             agentConfig.Model().Id(),
				ModelName:             model.Name,
				Application:           applicationTag.Id(),
				CharmGetter:           client,
				Clock:                 clock,
				DataDir:               agentConfig.DataDir(),
				ProfileDir:            config.ProfileDir,
				Downloader:            downloader,
				StatusSetter:          client,
				UnitGetter:            client,
				UnitRemover:           client,
				ApplicationWatcher:    client,
				ContainerStartWatcher: containerStartWatcherClient(client),
				VersionSetter:         client,
				StartUniterFunc:       uniter.StartUniter,
				RunListenerSocketFunc: runListenerSocketFunc,
				LeadershipTrackerFunc: leadershipTrackerFunc,
				UniterFacadeFunc:      newUniterFunc,
				ResourcesFacadeFunc:   newResourcesFacadeFunc,
				PayloadFacadeFunc:     newPayloadFacadeFunc,
				ExecClientGetter: func() (exec.Executor, error) {
					return config.NewExecClient(os.Getenv(caasconstants.OperatorNamespaceEnvName))
				},
			}

			loadOperatorInfoFunc := config.LoadOperatorInfo
			if loadOperatorInfoFunc == nil {
				loadOperatorInfoFunc = LoadOperatorInfo
			}
			operatorInfo, err := loadOperatorInfoFunc(wCfg.getPaths())
			if err != nil {
				return nil, errors.Trace(err)
			}
			wCfg.OperatorInfo = *operatorInfo
			wCfg.UniterParams = &uniter.UniterParams{
				NewOperationExecutor:    operation.NewExecutor,
				NewDeployer:             charm.NewDeployer,
				NewProcessRunner:        runner.NewRunner,
				DataDir:                 agentConfig.DataDir(),
				Clock:                   clock,
				MachineLock:             config.MachineLock,
				CharmDirGuard:           charmDirGuard,
				UpdateStatusSignal:      uniter.NewUpdateStatusTimer(),
				HookRetryStrategy:       hookRetryStrategy,
				TranslateResolverErr:    config.TranslateResolverErr,
				SecretsClient:           jujuSecretsAPI,
				SecretsBackendGetter:    secretsBackendGetter,
				SecretRotateWatcherFunc: secretRotateWatcherFunc,
				SecretExpiryWatcherFunc: secretExpiryWatcherFunc,
				Logger:                  wCfg.Logger.Child("uniter"),
			}
			wCfg.UniterParams.SocketConfig, err = socketConfig(operatorInfo)
			if err != nil {
				return nil, errors.Trace(err)
			}

			w, err := config.NewWorker(wCfg)
			if err != nil {
				return nil, errors.Trace(err)
			}
			return w, nil
		},
	}
}