docs(readme): 为所有客户端SDK添加英文版README及语言切换链接

2026-08-01 21:06:23 +08:00
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+# Kenaito Config Center Go Client
+
+Go client SDK for the Kenaito Config Center.
+
+## Features
+
+- Fetch application configs from the config center
+- Periodic config sync
+- Config change callback listener
+- Local file cache (fallback when config center is unavailable)
+
+## Installation
+
+### Option 1: Using go mod (Recommended)
+
+Run in your project root:
+
+```bash
+go get kenaito-conf/go-client
+```
+
+### Option 2: Local Development
+
+If you are developing or modifying the client code locally, use the `replace` directive:
+
+```bash
+# Add to your go.mod
+require kenaito-conf/go-client v0.0.0
+
+replace kenaito-conf/go-client => ../kenaito-conf-go-client
+```
+
+Then run:
+
+```bash
+go mod tidy
+```
+
+## Quick Start
+
+```go
+package main
+
+import (
+    "fmt"
+    "kenaito-conf/go-client"
+    "log"
+)
+
+func main() {
+    // Create config
+    cfg := &client.Config{
+        BaseURL:      "http://localhost:8080",
+        AppName:      "my-app",
+        Env:          "daily",
+        Version:      "latest",
+        Token:        "", // Optional, if app token verification is enabled
+        SyncInterval: 30, // Sync interval in seconds
+        CacheDir:     ".", // Cache directory
+    }
+
+    // Create client
+    c := client.New(cfg)
+
+    // Register config change callback
+    c.OnChange(func(changed map[string]string) {
+        fmt.Println("Config changed:")
+        for k, v := range changed {
+            fmt.Printf("  %s = %s\n", k, v)
+        }
+    })
+
+    // Start client (fetch configs + enable periodic sync)
+    if err := c.Start(); err != nil {
+        log.Fatalf("Failed to start: %v", err)
+    }
+    defer c.Stop()
+
+    // Read config
+    value := c.Get("database.host")
+    fmt.Printf("database.host = %s\n", value)
+
+    // Get all configs
+    all := c.GetAll()
+    for k, v := range all {
+        fmt.Printf("%s = %s\n", k, v)
+    }
+}
+```
+
+## Configuration
+
+| Parameter | Type | Description | Default |
+|-----------|------|-------------|---------|
+| `BaseURL` | string | Config center URL | Required |
+| `AppName` | string | Application name | Required |
+| `Env` | string | Environment (dev/daily/prod) | `dev` |
+| `Version` | string | Config version | `latest` |
+| `Token` | string | App token (if token verification is enabled) | Empty |
+| `SyncInterval` | int | Sync interval (seconds) | `60` |
+| `IgnoreGlobal` | bool | Whether to ignore global configs | `false` |
+| `CacheDir` | string | Local cache directory | `.` |
+
+## API Reference
+
+### `client.New(cfg *Config) *Client`
+
+Create a client instance.
+
+### `(*Client).Start() error`
+
+Start the client, fetch configs and enable periodic sync.
+
+### `(*Client).Stop()`
+
+Stop the client and disable periodic sync.
+
+### `(*Client).Get(key string) string`
+
+Get the value of a specific config entry.
+
+### `(*Client).GetAll() map[string]string`
+
+Get all config entries.
+
+### `(*Client).OnChange(handler func(map[string]string))`
+
+Register a config change callback. The function is called when configs change, with the changed key-value pairs as argument.
+
+## Demo
+
+See the full example at: [kenaito-conf-go-client-demo](../kenaito-conf-go-client-demo)
+
+Run the demo:
+
+```bash
+cd kenaito-conf-go-client-demo
+go run main.go
+```
+
+## Notes
+
+1. **Token Verification**: If the app has a token configured, pass the correct token value in `Config.Token`
+2. **Cache File**: The client creates a `config-cache.json` file in the `CacheDir` directory as a fallback when the config center is unavailable