Practice of dynamic configuration center based on go-zero

With the continuous development of Internet applications and systems, configuration management has increasingly become an important task. In the past, we often used manual configuration or simple configuration file solutions, but these methods can no longer meet the rapidly changing business needs. Therefore, in modern microservice architecture, dynamic configuration center has become a necessity.

In this article, we will introduce the practice of dynamic configuration center based on go-zero framework.

Introduction to go-zero

go-zero is a simple, efficient, and easy-to-use framework for building scalable, high-performance microservices. It has a rich tool chain and plug-ins to support a variety of modern Internet applications.

go-zero not only supports the development of business models, but also supports a series of non-business model solutions, such as caching systems, message queues, service discovery, logs, database migration, etc. These can provide developers with more support and assist them in building high-quality applications.

Dynamic Configuration Center Practice

In this article, we will focus on the dynamic configuration center practice of the go-zero framework. Dynamic Configuration Center is a service that manages the configuration information of applications. Through the dynamic configuration center, we can easily manage different versions of the application while supporting rapid changes and rollback of configurations.

Configuration Data Structures

First, let us consider the data structures used to solve configuration problems. We can define a Config structure to save configuration items.

type Config struct {
    Name      string `json:"name"`
    Version   string `json:"version"`
    Endpoint  string `json:"endpoint"`
    AccessKey string `json:"access_key"`
    SecretKey string `json:"secret_key"`
}

In the application, we can add more configuration items according to our needs.

Configuration Management

In the go-zero framework, we can use etcd or zookeeper as the storage backend for configuration management. We assume that etcd is used as the storage backend and the configuration management tools provided by the go-zero framework are used to operate etcd.

First, we need to define the ConfigManager structure to save the etcd client.

type ConfigManager struct {
    cli *clientv3.Client
}

In the initialization function, we can create etcd client and save it to ConfigManager.

func NewConfigManager(endpoints []string) (*ConfigManager, error) {
    cli, err := clientv3.New(clientv3.Config{
        Endpoints: endpoints,
    })
    if err != nil {
        return nil, err
    }
    return &ConfigManager{
        cli: cli,
    }, nil
}

Next, we can define a SaveConfig function to save configuration items to etcd.

func (m *ConfigManager) SaveConfig(cfg Config) error {
    ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
    defer cancel()

    data, err := json.Marshal(cfg)
    if err != nil {
        return err
    }

    _, err = m.cli.Put(ctx, "/config/"+cfg.Name, string(data))
    if err != nil {
        return err
    }

    return nil
}

Finally, we can define a GetConfig function to obtain the configuration item with the specified name from etcd and parse it into a Config structure.

func (m *ConfigManager) GetConfig(name string) (*Config, error) {
    ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
    defer cancel()

    resp, err := m.cli.Get(ctx, "/config/"+name)
    if err != nil {
        return nil, err
    }

    if len(resp.Kvs) == 0 {
        return nil, fmt.Errorf("config not found")
    }

    var cfg Config
    err = json.Unmarshal(resp.Kvs[0].Value, &cfg)
    if err != nil {
        return nil, err
    }

    return &cfg, nil
}

With these tools, we can easily manage configuration items. Now, let's consider how to use these configuration items in our application.

Application usage

In the go-zero framework, we can use configuration files to manage the configuration information of the application. Configuration files allow us to load configuration items when the application starts. However, there are situations where we need a more flexible and real-time solution.

The go-zero framework provides the ConfigCenter plug-in for loading application configuration items from the remote configuration center. We only need to simply configure the ConfigCenter plug-in to achieve dynamic configuration.

func main() {
    c := &cli.App{
        Commands: []*cli.Command{
            {
                Name:  "serve",
                Usage: "start server",
                Flags: []cli.Flag{
                    &cli.StringFlag{
                        Name:  "config",
                        Usage: "config file path",
                    },
                },
                Action: func(ctx *cli.Context) error {
                    var cfg Config
                    err := config.LoadFromEtcd(cfg.Name, cfg)
                    if err != nil {
                        log.Fatal(err)
                    }
                    log.Println(cfg)

                    // start server
                    return nil
                },
            },
        },
    }
    err := c.Run(os.Args)
    if err != nil {
        log.Fatal(err)
    }
}

In the above code, we use the config.LoadFromEtcd function to load the configuration item with the specified name from etcd. If you need to update configuration items, you can manually modify them in etcd. When we restart the application, it will load the latest configuration items.

Security

When implementing a dynamic configuration center, security is a very important point. Because configuration items often contain sensitive information, such as database credentials, API keys, etc. So in our practice, we should pay attention to the following points:

• Ensure the security of etcd and other related services.
• Do not store clear text passwords or sensitive information in etcd. Sensitive information can be protected through encryption or the use of secure storage solutions.
• Authenticate etcd and applications and authorize them to access and modify configuration items.

Conclusion

The dynamic configuration center is an integral part of modern applications. It provides us with a flexible, fast and secure way to manage application configuration information. In this article, we introduce the practice of dynamic configuration center based on go-zero framework. Through these practices, we can easily manage configuration items and implement dynamic configuration, and use them in applications.

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