/
model.go
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/
model.go
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// Copyright 2020 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package agent
import (
"os"
"path/filepath"
"runtime"
"github.com/juju/cmd/v3"
"github.com/juju/errors"
"github.com/juju/gnuflag"
"github.com/juju/names/v5"
"github.com/juju/utils/v3/voyeur"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/dependency"
"github.com/juju/juju/agent"
"github.com/juju/juju/caas"
caasprovider "github.com/juju/juju/caas/kubernetes/provider"
caasconstants "github.com/juju/juju/caas/kubernetes/provider/constants"
jujucmd "github.com/juju/juju/cmd"
"github.com/juju/juju/cmd/jujud/agent/agentconf"
"github.com/juju/juju/cmd/jujud/agent/engine"
agenterrors "github.com/juju/juju/cmd/jujud/agent/errors"
"github.com/juju/juju/cmd/jujud/agent/modeloperator"
cmdutil "github.com/juju/juju/cmd/jujud/util"
jujuversion "github.com/juju/juju/version"
jworker "github.com/juju/juju/worker"
"github.com/juju/juju/worker/gate"
"github.com/juju/juju/worker/logsender"
"github.com/juju/juju/worker/upgradesteps"
)
// ModelCommand is a cmd.Command responsible for running a model agent.
type ModelCommand struct {
agentconf.AgentConf
cmd.CommandBase
configChangedVal *voyeur.Value
dead chan struct{}
errReason error
ModelUUID string
runner *worker.Runner
upgradeComplete gate.Lock
bufferedLogger *logsender.BufferedLogWriter
}
// Done signals the model agent is finished
func (m *ModelCommand) Done(err error) {
m.errReason = err
close(m.dead)
}
// Info implements Command
func (m *ModelCommand) Info() *cmd.Info {
return jujucmd.Info(&cmd.Info{
Name: "model",
Purpose: "run a juju model operator",
})
}
// Init initializers the command for running
func (m *ModelCommand) Init(args []string) error {
if m.ModelUUID == "" {
return agenterrors.RequiredError("model-uuid")
}
if err := m.AgentConf.CheckArgs(args); err != nil {
return err
}
m.runner = worker.NewRunner(worker.RunnerParams{
IsFatal: agenterrors.IsFatal,
MoreImportant: agenterrors.MoreImportant,
RestartDelay: jworker.RestartDelay,
Logger: logger,
})
return nil
}
// maybeCopyAgentConfig copies the read-only agent config template
// to the writeable agent config file if the file doesn't yet exist.
func (m *ModelCommand) maybeCopyAgentConfig() error {
err := m.ReadConfig(m.Tag().String())
if err == nil {
return nil
}
if !os.IsNotExist(errors.Cause(err)) {
logger.Errorf("reading initial agent config file: %v", err)
return errors.Trace(err)
}
templateFile := filepath.Join(agent.Dir(m.DataDir(), m.Tag()), caasconstants.TemplateFileNameAgentConf)
if err := copyFile(agent.ConfigPath(m.DataDir(), m.Tag()), templateFile); err != nil {
logger.Errorf("copying agent config file template: %v", err)
return errors.Trace(err)
}
return m.ReadConfig(m.Tag().String())
}
// NewModelCommand creates a new ModelCommand instance properly initialized
func NewModelCommand(
bufferedLogger *logsender.BufferedLogWriter,
) *ModelCommand {
return &ModelCommand{
AgentConf: agentconf.NewAgentConf(""),
configChangedVal: voyeur.NewValue(true),
dead: make(chan struct{}),
bufferedLogger: bufferedLogger,
}
}
// Run implements Command
func (m *ModelCommand) Run(ctx *cmd.Context) error {
logger.Infof("caas model operator start (%s [%s])", jujuversion.Current,
runtime.Compiler)
if err := m.maybeCopyAgentConfig(); err != nil {
return errors.Annotate(err, "creating agent config from template")
}
m.upgradeComplete = upgradesteps.NewLock(m.CurrentConfig())
_ = m.runner.StartWorker("modeloperator", m.Workers)
return cmdutil.AgentDone(logger, m.runner.Wait())
}
// SetFlags implements Command
func (m *ModelCommand) SetFlags(f *gnuflag.FlagSet) {
m.AgentConf.AddFlags(f)
f.StringVar(&m.ModelUUID, "model-uuid", "", "uuid of the model")
}
// Stop implements worker
func (m *ModelCommand) Stop() error {
m.runner.Kill()
return m.Wait()
}
func (m *ModelCommand) Tag() names.Tag {
return names.NewModelTag(m.ModelUUID)
}
func (m *ModelCommand) Wait() error {
<-m.dead
return m.errReason
}
func (m *ModelCommand) Workers() (worker.Worker, error) {
port := os.Getenv(caasprovider.EnvModelAgentHTTPPort)
if port == "" {
return nil, errors.NotValidf("env %s missing", caasprovider.EnvModelAgentHTTPPort)
}
svcName := os.Getenv(caasprovider.EnvModelAgentCAASServiceName)
if svcName == "" {
return nil, errors.NotValidf("env %s missing", caasprovider.EnvModelAgentCAASServiceName)
}
svcNamespace := os.Getenv(caasprovider.EnvModelAgentCAASServiceNamespace)
if svcNamespace == "" {
return nil, errors.NotValidf("env %s missing", caasprovider.EnvModelAgentCAASServiceNamespace)
}
updateAgentConfLogging := func(loggingConfig string) error {
return m.AgentConf.ChangeConfig(func(setter agent.ConfigSetter) error {
setter.SetLoggingConfig(loggingConfig)
return nil
})
}
manifolds := modeloperator.Manifolds(modeloperator.ManifoldConfig{
Agent: agent.APIHostPortsSetter{Agent: m},
AgentConfigChanged: m.configChangedVal,
NewContainerBrokerFunc: caas.New,
Port: port,
LogSource: m.bufferedLogger.Logs(),
ServiceName: svcName,
ServiceNamespace: svcNamespace,
UpdateLoggerConfig: updateAgentConfLogging,
PreviousAgentVersion: m.CurrentConfig().UpgradedToVersion(),
UpgradeStepsLock: m.upgradeComplete,
})
// TODO (stickupkid): There is no prometheus registry at this level, we
// should work out the best way to get it into here.
engine, err := dependency.NewEngine(engine.DependencyEngineConfig(dependency.DefaultMetrics()))
if err != nil {
return nil, err
}
if err := dependency.Install(engine, manifolds); err != nil {
if err := worker.Stop(engine); err != nil {
logger.Errorf("while stopping engine with bad manifolds: %v", err)
}
return nil, err
}
return engine, nil
}