Golang Info.Kind方法代码示例

// deploy deploys the supplied charm, and sets follow-up hook operation state
// as indicated by reason.
func (u *Uniter) deploy(sch *state.Charm, reason Op) error {
	if reason != Install && reason != Upgrade {
		panic(fmt.Errorf("%q is not a deploy operation", reason))
	}
	var hi *hook.Info
	if u.s != nil && (u.s.Op == RunHook || u.s.Op == Upgrade) {
		// If this upgrade interrupts a RunHook, we need to preserve the hook
		// info so that we can return to the appropriate error state. However,
		// if we're resuming (or have force-interrupted) an Upgrade, we also
		// need to preserve whatever hook info was preserved when we initially
		// started upgrading, to ensure we still return to the correct state.
		hi = u.s.Hook
	}
	url := sch.URL()
	if u.s == nil || u.s.OpStep != Done {
		log.Printf("worker/uniter: fetching charm %q", url)
		bun, err := u.bundles.Read(sch, u.tomb.Dying())
		if err != nil {
			return err
		}
		if err = u.deployer.Stage(bun, url); err != nil {
			return err
		}
		log.Printf("worker/uniter: deploying charm %q", url)
		if err = u.writeState(reason, Pending, hi, url); err != nil {
			return err
		}
		if err = u.deployer.Deploy(u.charm); err != nil {
			return err
		}
		if err = u.writeState(reason, Done, hi, url); err != nil {
			return err
		}
	}
	log.Printf("worker/uniter: charm %q is deployed", url)
	if err := u.unit.SetCharm(sch); err != nil {
		return err
	}
	status := Queued
	if hi != nil {
		// If a hook operation was interrupted, restore it.
		status = Pending
	} else {
		// Otherwise, queue the relevant post-deploy hook.
		hi = &hook.Info{}
		switch reason {
		case Install:
			hi.Kind = hook.Install
		case Upgrade:
			hi.Kind = hook.UpgradeCharm
		}
	}
	return u.writeState(RunHook, status, hi, nil)
}

// deploy deploys the supplied charm URL, and sets follow-up hook operation state
// as indicated by reason.
func (u *Uniter) deploy(curl *corecharm.URL, reason Op) error {
	if reason != Install && reason != Upgrade {
		panic(fmt.Errorf("%q is not a deploy operation", reason))
	}
	var hi *hook.Info
	if u.s != nil && (u.s.Op == RunHook || u.s.Op == Upgrade) {
		// If this upgrade interrupts a RunHook, we need to preserve the hook
		// info so that we can return to the appropriate error state. However,
		// if we're resuming (or have force-interrupted) an Upgrade, we also
		// need to preserve whatever hook info was preserved when we initially
		// started upgrading, to ensure we still return to the correct state.
		hi = u.s.Hook
	}
	if u.s == nil || u.s.OpStep != Done {
		// Get the new charm bundle before announcing intention to use it.
		log.Infof("worker/uniter: fetching charm %q", curl)
		sch, err := u.st.Charm(curl)
		if err != nil {
			return err
		}
		bun, err := u.bundles.Read(sch, u.tomb.Dying())
		if err != nil {
			return err
		}
		if err = u.deployer.Stage(bun, curl); err != nil {
			return err
		}

		// Set the new charm URL - this returns when the operation is complete,
		// at which point we can refresh the local copy of the unit to get a
		// version with the correct charm URL, and can go ahead and deploy
		// the charm proper.
		if err := u.f.SetCharm(curl); err != nil {
			return err
		}
		if err := u.unit.Refresh(); err != nil {
			return err
		}
		log.Infof("worker/uniter: deploying charm %q", curl)
		if err = u.writeState(reason, Pending, hi, curl); err != nil {
			return err
		}
		if err = u.deployer.Deploy(u.charm); err != nil {
			return err
		}
		if err = u.writeState(reason, Done, hi, curl); err != nil {
			return err
		}
	}
	log.Infof("worker/uniter: charm %q is deployed", curl)
	status := Queued
	if hi != nil {
		// If a hook operation was interrupted, restore it.
		status = Pending
	} else {
		// Otherwise, queue the relevant post-deploy hook.
		hi = &hook.Info{}
		switch reason {
		case Install:
			hi.Kind = hooks.Install
		case Upgrade:
			hi.Kind = hooks.UpgradeCharm
		}
	}
	return u.writeState(RunHook, status, hi, nil)
}