Meluncurkan fitur ke audiens yang ditargetkan dalam aplikasi web Go Gin

Dalam panduan ini, Anda akan menggunakan filter penargetan untuk meluncurkan fitur ke audiens yang ditargetkan untuk aplikasi web Go Gin Anda. Untuk informasi selengkapnya tentang filter penargetan, lihat Meluncurkan fitur ke audiens yang ditargetkan.

Prerequisites

Sebuah akun Azure dengan langganan aktif. Buat akun gratis.
Penyimpanan App Configuration, seperti yang ditunjukkan dalam tutorial untuk membuat penyimpanan.
Bendera fitur dengan filter penargetan. Buat bendera fitur.
Buka 1.21 atau yang lebih baru. Untuk informasi tentang menginstal Go, lihat halaman Unduhan Go.
Penyedia Azure App Configuration Go v1.1.0 atau yang lebih baru.

Membuat aplikasi web dengan bendera fitur

Di bagian ini, Anda membuat aplikasi web yang memungkinkan pengguna untuk masuk dan menggunakan bendera fitur Beta yang Anda buat sebelumnya.

Buat direktori baru untuk proyek Go Anda dan navigasikan ke dalamnya:
```
mkdir gin-targeting-quickstart
cd gin-targeting-quickstart
```
Menginisialisasi modul Go baru:
```
go mod init gin-targeting-quickstart
```

Instal paket Go yang diperlukan:

go get github.com/gin-gonic/gin
go get github.com/gin-contrib/sessions
go get github.com/gin-contrib/sessions/cookie
go get github.com/microsoft/Featuremanagement-Go/featuremanagement
go get github.com/microsoft/Featuremanagement-Go/featuremanagement/providers/azappconfig

Buat direktori templat untuk templat HTML Anda dan tambahkan file HTML yang diperlukan:
```
mkdir templates
```
Tambahkan file templat HTML berikut dari repositori GitHub dan letakkan di templates direktori:
- index.html - Templat halaman beranda
- beta.html - Templat halaman beta
- login.html - Templat halaman masuk

Buat file bernama appconfig.go dengan konten berikut. Anda dapat menyambungkan ke penyimpanan App Configuration menggunakan ID Microsoft Entra (disarankan) atau string koneksi.

ID Microsoft Entra (disarankan)
Koneksi string

package main

import (
    "context"
    "log"
    "os"

    "github.com/Azure/AppConfiguration-GoProvider/azureappconfiguration"
    "github.com/Azure/azure-sdk-for-go/sdk/azidentity"
)

func loadAzureAppConfiguration(ctx context.Context) (*azureappconfiguration.AzureAppConfiguration, error) {
    // Get the endpoint from environment variable
    endpoint := os.Getenv("AZURE_APPCONFIG_ENDPOINT")
    if endpoint == "" {
        log.Fatal("AZURE_APPCONFIG_ENDPOINT environment variable is not set")
    }

    // Create a credential using DefaultAzureCredential
    credential, err := azidentity.NewDefaultAzureCredential(nil)
    if err != nil {
        log.Fatalf("Failed to create credential: %v", err)
    }

    // Set up authentication options with endpoint and credential
    authOptions := azureappconfiguration.AuthenticationOptions{
        Endpoint:   endpoint,
        Credential: credential,
    }

    // Set up options to enable feature flags
    options := &azureappconfiguration.Options{
        FeatureFlagOptions: azureappconfiguration.FeatureFlagOptions{
            Enabled: true,
            RefreshOptions: azureappconfiguration.RefreshOptions{
                Enabled: true,
            },
        },
    }

    // Load configuration from Azure App Configuration
    appConfig, err := azureappconfiguration.Load(ctx, authOptions, options)
    if err != nil {
        log.Fatalf("Failed to load configuration: %v", err)
    }

    return appConfig, nil
}

package main

import (
    "context"
    "log"
    "os"

    "github.com/Azure/AppConfiguration-GoProvider/azureappconfiguration"
)

func loadAzureAppConfiguration(ctx context.Context) (*azureappconfiguration.AzureAppConfiguration, error) {
    // Get the connection string from environment variable
    connectionString := os.Getenv("AZURE_APPCONFIG_CONNECTION_STRING")
    if connectionString == "" {
        log.Fatal("AZURE_APPCONFIG_CONNECTION_STRING environment variable is not set")
    }

    // Set up authentication options with connection string
    authOptions := azureappconfiguration.AuthenticationOptions{
        ConnectionString: connectionString,
    }

    // Set up options to enable feature flags
    options := &azureappconfiguration.Options{
        FeatureFlagOptions: azureappconfiguration.FeatureFlagOptions{
            Enabled: true,
            RefreshOptions: azureappconfiguration.RefreshOptions{
                Enabled: true,
            },
        },
    }

    // Load configuration from Azure App Configuration
    appConfig, err := azureappconfiguration.Load(ctx, authOptions, options)
    if err != nil {
        log.Fatalf("Failed to load configuration: %v", err)
    }

    return appConfig, nil
}

Menggunakan penargetan dengan bendera fitur

Buat file bernama main.go dengan konten berikut.

package main

import (
    "context"
    "fmt"
    "log"
    "net/http"
    "strings"

    "github.com/gin-contrib/sessions"
    "github.com/gin-contrib/sessions/cookie"
    "github.com/gin-gonic/gin"
    "github.com/microsoft/Featuremanagement-Go/featuremanagement"
    "github.com/microsoft/Featuremanagement-Go/featuremanagement/providers/azappconfig"
)

type WebApp struct {
    featureManager *featuremanagement.FeatureManager
    appConfig      *azureappconfiguration.AzureAppConfiguration
}

func main() {
    // Load Azure App Configuration
    appConfig, err := loadAzureAppConfiguration(context.Background())
    if err != nil {
        log.Fatalf("Error loading Azure App Configuration: %v", err)
    }

    // Create feature flag provider
    featureFlagProvider, err := azappconfig.NewFeatureFlagProvider(appConfig)
    if err != nil {
        log.Fatalf("Error creating feature flag provider: %v", err)
    }

    // Create feature manager
    featureManager, err := featuremanagement.NewFeatureManager(featureFlagProvider, nil)
    if err != nil {
        log.Fatalf("Error creating feature manager: %v", err)
    }

    // Create web app
    app := &WebApp{
        featureManager: featureManager,
        appConfig:      appConfig,
    }

    // Setup Gin with default middleware (Logger and Recovery)
    r := gin.Default()

    // Start server
    if err := r.Run(":8080"); err != nil {
        log.Fatalf("Failed to start server: %v", err)
    }

    fmt.Println("Starting server on http://localhost:8080")
    fmt.Println("Open http://localhost:8080 in your browser")
    fmt.Println()
}

Aktifkan refresh flag konfigurasi dan fitur dari Azure App Configuration melalui middleware.

// Existing code
// ... ...

func (app *WebApp) refreshMiddleware() gin.HandlerFunc {
    return func(c *gin.Context) {
        go func() {
            if err := app.appConfig.Refresh(context.Background()); err != nil {
                log.Printf("Error refreshing configuration: %v", err)
            }
        }()
        c.Next()
    }
}

func (app *WebApp) featureMiddleware() gin.HandlerFunc {
    return func(c *gin.Context) {
        // Get current user from session
        session := sessions.Default(c)
        username := session.Get("username")

        var betaEnabled bool
        var targetingContext featuremanagement.TargetingContext
        if username != nil {
            // Evaluate Beta feature with targeting context
            var err error
            targetingContext = createTargetingContext(username.(string))
            betaEnabled, err = app.featureManager.IsEnabledWithAppContext("Beta", targetingContext)
            if err != nil {
                log.Printf("Error checking Beta feature with targeting: %v", err)
            }
        }

        c.Set("betaEnabled", betaEnabled)
        c.Set("user", username)
        c.Set("targetingContext", targetingContext)
        c.Next()
    }
}

// Helper function to create TargetingContext
func createTargetingContext(userID string) featuremanagement.TargetingContext {
    targetingContext := featuremanagement.TargetingContext{
        UserID: userID,
        Groups: []string{},
    }

    if strings.Contains(userID, "@") {
        parts := strings.Split(userID, "@")
        if len(parts) == 2 {
            targetingContext.Groups = append(targetingContext.Groups, parts[1]) // Add domain as group
        }
    }

    return targetingContext
}

// The rest of existing code
//... ...

Siapkan rute dengan konten berikut:

// Existing code
// ... ...

func (app *WebApp) setupRoutes(r *gin.Engine) {
    // Setup sessions
    store := cookie.NewStore([]byte("secret-key-change-in-production"))
    store.Options(sessions.Options{
        MaxAge:   3600, // 1 hour
        HttpOnly: true,
        Secure:   false, // Set to true in production with HTTPS
    })
    r.Use(sessions.Sessions("session", store))


    r.Use(app.refreshMiddleware())
    r.Use(app.featureMiddleware())

    // Load HTML templates
    r.LoadHTMLGlob("templates/*.html")

    // Routes
    r.GET("/", app.homeHandler)
    r.GET("/beta", app.betaHandler)
    r.GET("/login", app.loginPageHandler)
    r.POST("/login", app.loginHandler)
    r.GET("/logout", app.logoutHandler)
}

// Home page handler
func (app *WebApp) homeHandler(c *gin.Context) {
    betaEnabled := c.GetBool("betaEnabled")
    user := c.GetString("user")

    c.HTML(http.StatusOK, "index.html", gin.H{
        "title":       "TestFeatureFlags",
        "betaEnabled": betaEnabled,
        "user":        user,
    })
}

// Beta page handler
func (app *WebApp) betaHandler(c *gin.Context) {
    betaEnabled := c.GetBool("betaEnabled")
    if !betaEnabled {
        return
    }

    c.HTML(http.StatusOK, "beta.html", gin.H{
        "title": "Beta Page",
    })
}

func (app *WebApp) loginPageHandler(c *gin.Context) {
    c.HTML(http.StatusOK, "login.html", gin.H{
        "title": "Login",
    })
}

func (app *WebApp) loginHandler(c *gin.Context) {
    username := c.PostForm("username")

    // Basic validation - ensure username is not empty
    if strings.TrimSpace(username) == "" {
        c.HTML(http.StatusOK, "login.html", gin.H{
            "title": "Login",
            "error": "Username cannot be empty",
        })
        return
    }

    // Store username in session - any valid username is accepted
    session := sessions.Default(c)
    session.Set("username", username)
    session.Save()
    c.Redirect(http.StatusFound, "/")
}

func (app *WebApp) logoutHandler(c *gin.Context) {
    session := sessions.Default(c)
    session.Clear()
    session.Save()
    c.Redirect(http.StatusFound, "/")
}

// The rest of existing code
//... ...

Perbarui main.go dengan konten berikut:

// Existing code
// ... ...
 r := gin.Default()

 // Setup routes
 app.setupRoutes(r)

 // Start server
 if err := r.Run(":8080"); err != nil {
    log.Fatalf("Failed to start server: %v", err)
}
// The rest of existing code
// ... ...

Setelah menyelesaikan langkah-langkah sebelumnya, file Anda main.go sekarang harus berisi implementasi lengkap seperti yang ditunjukkan di bawah ini:

package main

import (
    "context"
    "fmt"
    "log"
    "net/http"
    "strings"

    "github.com/gin-contrib/sessions"
    "github.com/gin-contrib/sessions/cookie"
    "github.com/gin-gonic/gin"
    "github.com/microsoft/Featuremanagement-Go/featuremanagement"
    "github.com/microsoft/Featuremanagement-Go/featuremanagement/providers/azappconfig"
)

type WebApp struct {
    featureManager *featuremanagement.FeatureManager
    appConfig      *azureappconfiguration.AzureAppConfiguration
}

func (app *WebApp) refreshMiddleware() gin.HandlerFunc {
    return func(c *gin.Context) {
        go func() {
            if err := app.appConfig.Refresh(context.Background()); err != nil {
                log.Printf("Error refreshing configuration: %v", err)
            }
        }()
        c.Next()
    }
}

func (app *WebApp) featureMiddleware() gin.HandlerFunc {
    return func(c *gin.Context) {
        // Get current user from session
        session := sessions.Default(c)
        username := session.Get("username")

        var betaEnabled bool
        var targetingContext featuremanagement.TargetingContext
        if username != nil {
            // Evaluate Beta feature with targeting context
            var err error
            targetingContext = createTargetingContext(username.(string))
            betaEnabled, err = app.featureManager.IsEnabledWithAppContext("Beta", targetingContext)
            if err != nil {
                log.Printf("Error checking Beta feature with targeting: %v", err)
            }
        }

        c.Set("betaEnabled", betaEnabled)
        c.Set("user", username)
        c.Set("targetingContext", targetingContext)
        c.Next()
    }
}

// Helper function to create TargetingContext
func createTargetingContext(userID string) featuremanagement.TargetingContext {
    targetingContext := featuremanagement.TargetingContext{
        UserID: userID,
        Groups: []string{},
    }

    if strings.Contains(userID, "@") {
        parts := strings.Split(userID, "@")
        if len(parts) == 2 {
            targetingContext.Groups = append(targetingContext.Groups, parts[1]) // Add domain as group
        }
    }

    return targetingContext
}

func (app *WebApp) setupRoutes(r *gin.Engine) {
    // Setup sessions
    store := cookie.NewStore([]byte("secret-key-change-in-production"))
    store.Options(sessions.Options{
        MaxAge:   3600, // 1 hour
        HttpOnly: true,
        Secure:   false, // Set to true in production with HTTPS
    })
    r.Use(sessions.Sessions("session", store))


    r.Use(app.refreshMiddleware())
    r.Use(app.featureMiddleware())

    // Load HTML templates
    r.LoadHTMLGlob("templates/*.html")

    // Routes
    r.GET("/", app.homeHandler)
    r.GET("/beta", app.betaHandler)
    r.GET("/login", app.loginPageHandler)
    r.POST("/login", app.loginHandler)
    r.GET("/logout", app.logoutHandler)
}

// Home page handler
func (app *WebApp) homeHandler(c *gin.Context) {
    betaEnabled := c.GetBool("betaEnabled")
    user := c.GetString("user")

    c.HTML(http.StatusOK, "index.html", gin.H{
        "title":       "TestFeatureFlags",
        "betaEnabled": betaEnabled,
        "user":        user,
    })
}

// Beta page handler
func (app *WebApp) betaHandler(c *gin.Context) {
    betaEnabled := c.GetBool("betaEnabled")
    if !betaEnabled {
        return
    }

    c.HTML(http.StatusOK, "beta.html", gin.H{
        "title": "Beta Page",
    })
}

func (app *WebApp) loginPageHandler(c *gin.Context) {
    c.HTML(http.StatusOK, "login.html", gin.H{
        "title": "Login",
    })
}

func (app *WebApp) loginHandler(c *gin.Context) {
    username := c.PostForm("username")

    // Basic validation - ensure username is not empty
    if strings.TrimSpace(username) == "" {
        c.HTML(http.StatusOK, "login.html", gin.H{
            "title": "Login",
            "error": "Username cannot be empty",
        })
        return
    }

    // Store username in session - any valid username is accepted
    session := sessions.Default(c)
    session.Set("username", username)
    session.Save()
    c.Redirect(http.StatusFound, "/")
}

func (app *WebApp) logoutHandler(c *gin.Context) {
    session := sessions.Default(c)
    session.Clear()
    session.Save()
    c.Redirect(http.StatusFound, "/")
}

func main() {
    // Load Azure App Configuration
    appConfig, err := loadAzureAppConfiguration(context.Background())
    if err != nil {
        log.Fatalf("Error loading Azure App Configuration: %v", err)
    }

    // Create feature flag provider
    featureFlagProvider, err := azappconfig.NewFeatureFlagProvider(appConfig)
    if err != nil {
        log.Fatalf("Error creating feature flag provider: %v", err)
    }

    // Create feature manager
    featureManager, err := featuremanagement.NewFeatureManager(featureFlagProvider, nil)
    if err != nil {
        log.Fatalf("Error creating feature manager: %v", err)
    }

    // Create web app
    app := &WebApp{
        featureManager: featureManager,
        appConfig:      appConfig,
    }

    // Setup Gin with default middleware (Logger and Recovery)
    r := gin.Default()

    // Setup routes
    app.setupRoutes(r)

    // Start server
    if err := r.Run(":8080"); err != nil {
        log.Fatalf("Failed to start server: %v", err)
    }

    fmt.Println("Starting server on http://localhost:8080")
    fmt.Println("Open http://localhost:8080 in your browser")
    fmt.Println()
}

Menargetkan filter dalam tindakan

Atur variabel lingkungan untuk autentikasi dan jalankan aplikasi:
```
go mod tidy
go run .
```
Buka jendela browser, dan buka http://localhost:8080. Awalnya, item Beta tidak muncul di toolbar, karena opsi Persentase default diatur ke 0.
Klik tautan Masuk di sudut kanan atas. Coba masuk dengan test@contoso.com.
Setelah masuk sebagai test@contoso.com, item Beta sekarang muncul di toolbar, karena test@contoso.com ditentukan sebagai pengguna yang ditargetkan.
Silakan keluar, lalu masuk kembali sebagai testuser@contoso.com. Item Beta tidak muncul di toolbar, karena testuser@contoso.com ditentukan sebagai pengguna yang dikecualikan.

Langkah selanjutnya

Untuk mempelajari selengkapnya tentang filter fitur, lanjutkan ke dokumen berikut.

Mengaktifkan fitur bersyarat dengan penyaring fitur

Mengaktifkan fitur sesuai jadwal

Untuk informasi selengkapnya tentang pustaka Manajemen Fitur Go, lanjutkan ke dokumen berikut ini:

Referensi Manajemen Fitur Go

Saran dan Komentar

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Last updated on 2025-08-26