Exemplo n.º 1
0
Arquivo: wait.go Projeto: bac/juju
// WaitForEnviron waits for an valid environment to arrive from the given
// watcher. It terminates with ErrWaitAborted if it receives a value on abort.
//
// In practice, it shouldn't wait at all: juju *should* never deliver invalid
// environ configs. Regardless, it should be considered deprecated; clients
// should prefer to access an Environ via a shared Tracker.
//
// It never takes responsibility for the supplied watcher; the client remains
// responsible for detecting and handling any watcher errors that may occur,
// whether this func succeeds or fails.
func WaitForEnviron(
	// TODO(wallyworld) - pass in credential watcher
	w watcher.NotifyWatcher,
	getter environs.EnvironConfigGetter,
	newEnviron environs.NewEnvironFunc,
	abort <-chan struct{},
) (environs.Environ, error) {
	for {
		select {
		case <-abort:
			return nil, ErrWaitAborted
		case _, ok := <-w.Changes():
			if !ok {
				return nil, errors.New("environ config watch closed")
			}
			// First check the model config is valid as we want to exit with
			// an error if we have received a config but it is not valid.
			// This distinguishes from the case where environ construction fails
			// because no config has been received yet.
			if _, err := getter.ModelConfig(); err != nil {
				return nil, errors.Annotate(err, "cannot read environ config")
			}
			environ, err := environs.GetEnviron(getter, newEnviron)
			if err == nil {
				return environ, nil
			}
			logger.Errorf("loaded invalid environment configuration: %v", err)
		}
	}
}
Exemplo n.º 2
0
Arquivo: types.go Projeto: bac/juju
// NetworkingEnvironFromModelConfig constructs and returns
// environs.NetworkingEnviron using the given configGetter. Returns an error
// satisfying errors.IsNotSupported() if the model config does not support
// networking features.
func NetworkingEnvironFromModelConfig(configGetter environs.EnvironConfigGetter) (environs.NetworkingEnviron, error) {
	modelConfig, err := configGetter.ModelConfig()
	if err != nil {
		return nil, errors.Annotate(err, "failed to get model config")
	}
	if modelConfig.Type() == "dummy" {
		return nil, errors.NotSupportedf("dummy provider network config")
	}
	env, err := environs.GetEnviron(configGetter, environs.New)
	if err != nil {
		return nil, errors.Annotate(err, "failed to construct a model from config")
	}
	netEnviron, supported := environs.SupportsNetworking(env)
	if !supported {
		// " not supported" will be appended to the message below.
		return nil, errors.NotSupportedf("model %q networking", modelConfig.Name())
	}
	return netEnviron, nil
}