使用 Azure App Configuration 实现动态配置

Source: Dev.to

Azure App Configuration 提供了一项服务，用于集中管理应用程序设置和功能标记。现代程序，尤其是在云中运行的程序，通常由许多分布式组件组成。

在本文中，我们将探讨使用 Azure App Configuration 的动态配置以及标签如何进一步提升动态化程度。通过标签，您可以在一个位置为特定环境提供设置，同时使用环境变量来获取各环境的值。您还可以使用标签创建不同的配置文件——只需使用不同的键而不是环境名称即可。

Calling label‑specific configurations with .NET

First, add the package Microsoft.Extensions.Configuration.AzureAppConfiguration:

dotnet add package Microsoft.Extensions.Configuration.AzureAppConfiguration

Configure the connection to Azure App Configuration using an environment variable that holds the connection string:

var builder = WebApplication.CreateBuilder(args);
builder.Configuration.AddAzureAppConfiguration(options => {
    options.Connect(builder.Configuration.GetConnectionString("APPCONFIG_CONNECTION_STRING"))
           .Select(KeyFilter.Any, LabelFilter.Null)          // Load unlabelled settings
           .Select(KeyFilter.Any, "");       // Load settings with a specific label
});

The first Select loads all configurations without a label; the second loads those with the specified label.

For an environment‑based approach, you can use the current environment name:

var environment = builder.Environment.EnvironmentName;

Your configuration settings are then accessed through the normal IConfiguration interface.

You can also supply any label name (e.g., from a database or Redis cache) in the Select method to load a specific profile.

Calling label‑specific configurations with TypeScript

The same principles apply when using the JavaScript SDK, which works with React, Angular, etc. Install the package via npm:

npm install @azure/app-configuration

Import the client in your TypeScript file:

import { AppConfigurationClient } from "@azure/app-configuration";

Set up connection variables and the key you want to retrieve:

const connectionString = process.env["APPCONFIG_CONNECTION_STRING"] || "";
const client = new AppConfigurationClient(connectionString);

const configKey = "Samples:Endpoint:Url";
const labelKey = process.env["ENVIRONMENT"] || "Development";

Retrieve the configuration setting using the key and label:

const betaEndpoint = await client.getConfigurationSetting({
    key: configKey,
    label: labelKey
});