Golang State.ForModel方法代碼示例

func (c *MigrateCommand) exportModel(ctx *cmd.Context, st *state.State) error {
	ctx.Infof("\nexport %s", c.modelUUID)

	// first make sure the uuid is good enough
	tag := names.NewModelTag(c.modelUUID)
	_, err := st.GetModel(tag)
	if err != nil {
		return errors.Trace(err)
	}

	modelState, err := st.ForModel(tag)
	if err != nil {
		return errors.Trace(err)
	}
	defer modelState.Close()

	model, err := modelState.Export()
	if err != nil {
		return errors.Trace(err)
	}

	bytes, err := yaml.Marshal(model)
	if err != nil {
		return errors.Trace(err)
	}

	ctx.Stdout.Write(bytes)
	return nil
}

func destroyModel(st *state.State, modelTag names.ModelTag, destroyHostedModels bool) error {
	var err error
	if modelTag != st.ModelTag() {
		if st, err = st.ForModel(modelTag); err != nil {
			return errors.Trace(err)
		}
		defer st.Close()
	}

	if destroyHostedModels {
		envs, err := st.AllModels()
		if err != nil {
			return errors.Trace(err)
		}
		for _, env := range envs {
			envSt, err := st.ForModel(env.ModelTag())
			defer envSt.Close()
			if err != nil {
				return errors.Trace(err)
			}
			check := NewBlockChecker(envSt)
			if err = check.DestroyAllowed(); err != nil {
				return errors.Trace(err)
			}
		}
	} else {
		check := NewBlockChecker(st)
		if err = check.DestroyAllowed(); err != nil {
			return errors.Trace(err)
		}
	}

	env, err := st.Model()
	if err != nil {
		return errors.Trace(err)
	}

	if destroyHostedModels {
		if err := env.DestroyIncludingHosted(); err != nil {
			return err
		}
	} else {
		if err = env.Destroy(); err != nil {
			return errors.Trace(err)
		}
	}

	err = sendMetrics(st)
	if err != nil {
		logger.Warningf("failed to send leftover metrics: %v", err)
	}

	// Return to the caller. If it's the CLI, it will finish up by calling the
	// provider's Destroy method, which will destroy the controllers, any
	// straggler instances, and other provider-specific resources. Once all
	// resources are torn down, the Undertaker worker handles the removal of
	// the environment.
	return nil
}

func (c *dumpLogsCommand) dumpLogsForEnv(ctx *cmd.Context, st0 *state.State, tag names.ModelTag) error {
	st, err := st0.ForModel(tag)
	if err != nil {
		return errors.Annotate(err, "failed open model")
	}
	defer st.Close()

	logName := ctx.AbsPath(filepath.Join(c.outDir, fmt.Sprintf("%s.log", tag.Id())))
	ctx.Infof("writing to %s", logName)

	file, err := os.Create(logName)
	if err != nil {
		return errors.Annotate(err, "failed to open output file")
	}
	defer file.Close()

	writer := bufio.NewWriter(file)
	defer writer.Flush()

	tailer, err := state.NewLogTailer(st, &state.LogTailerParams{NoTail: true})
	if err != nil {
		return errors.Annotate(err, "failed to create a log tailer")
	}
	logs := tailer.Logs()
	for {
		rec, ok := <-logs
		if !ok {
			break
		}
		writer.WriteString(c.format(
			rec.Time,
			rec.Level,
			rec.Entity.String(),
			rec.Module,
			rec.Message,
		) + "\n")
	}

	return nil
}