/
manifold.go
107 lines (93 loc) · 3.09 KB
/
manifold.go
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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package upgrader
import (
"time"
"github.com/juju/errors"
"github.com/juju/version/v2"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/dependency"
"github.com/juju/juju/agent"
"github.com/juju/juju/api/agent/upgrader"
"github.com/juju/juju/api/base"
"github.com/juju/juju/upgrades"
"github.com/juju/juju/worker/gate"
)
// Clock represents the clock methods this worker uses.
type Clock interface {
After(time.Duration) <-chan time.Time
}
// Logger represents the logging methods used by this package.
type Logger interface {
Debugf(string, ...interface{})
Infof(string, ...interface{})
Errorf(string, ...interface{})
}
// ManifoldConfig defines the names of the manifolds on which a
// Manifold will depend.
type ManifoldConfig struct {
AgentName string
APICallerName string
UpgradeStepsGateName string
UpgradeCheckGateName string
PreviousAgentVersion version.Number
Logger Logger
Clock Clock
}
// Manifold returns a dependency manifold that runs an upgrader
// worker, using the resource names defined in the supplied config.
func Manifold(config ManifoldConfig) dependency.Manifold {
inputs := []string{
config.AgentName,
config.APICallerName,
}
// The machine agent uses these but the unit agent doesn't.
if config.UpgradeStepsGateName != "" {
inputs = append(inputs, config.UpgradeStepsGateName)
}
if config.UpgradeCheckGateName != "" {
inputs = append(inputs, config.UpgradeCheckGateName)
}
return dependency.Manifold{
Inputs: inputs,
Start: func(context dependency.Context) (worker.Worker, error) {
var agent agent.Agent
if err := context.Get(config.AgentName, &agent); err != nil {
return nil, err
}
currentConfig := agent.CurrentConfig()
var apiCaller base.APICaller
if err := context.Get(config.APICallerName, &apiCaller); err != nil {
return nil, err
}
upgraderFacade := upgrader.NewState(apiCaller)
// If there is no UpgradeStepsGateName, the worker should
// report the running version and exit.
var upgradeStepsWaiter gate.Waiter
if config.UpgradeStepsGateName != "" {
if config.PreviousAgentVersion == version.Zero {
return nil, errors.New("previous agent version not specified")
}
if err := context.Get(config.UpgradeStepsGateName, &upgradeStepsWaiter); err != nil {
return nil, err
}
}
var initialCheckUnlocker gate.Unlocker
if config.UpgradeCheckGateName != "" {
if err := context.Get(config.UpgradeCheckGateName, &initialCheckUnlocker); err != nil {
return nil, err
}
}
return NewAgentUpgrader(Config{
Clock: config.Clock,
Logger: config.Logger,
State: upgraderFacade,
AgentConfig: currentConfig,
OrigAgentVersion: config.PreviousAgentVersion,
UpgradeStepsWaiter: upgradeStepsWaiter,
InitialUpgradeCheckComplete: initialCheckUnlocker,
CheckDiskSpace: upgrades.CheckFreeDiskSpace,
})
},
}
}