/
manifold.go
97 lines (84 loc) · 2.86 KB
/
manifold.go
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// Copyright 2019 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package caasupgrader
import (
"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/api/controller/caasoperatorupgrader"
"github.com/juju/juju/worker/gate"
)
// 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
}
// 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 application 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) {
if config.PreviousAgentVersion == version.Zero {
return nil, errors.New("previous agent version not specified")
}
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)
operatorUpgraderFacade := caasoperatorupgrader.NewClient(apiCaller)
var upgradeStepsWaiter gate.Waiter
if config.UpgradeStepsGateName == "" {
upgradeStepsWaiter = gate.NewLock()
} else {
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 == "" {
initialCheckUnlocker = gate.NewLock()
} else {
if err := context.Get(config.UpgradeCheckGateName, &initialCheckUnlocker); err != nil {
return nil, err
}
}
return NewUpgrader(Config{
UpgraderClient: upgraderFacade,
CAASOperatorUpgrader: operatorUpgraderFacade,
AgentTag: currentConfig.Tag(),
OrigAgentVersion: config.PreviousAgentVersion,
UpgradeStepsWaiter: upgradeStepsWaiter,
InitialUpgradeCheckComplete: initialCheckUnlocker,
})
},
}
}