Add EtcdClient implementation for managing etcd connections with methods for connecting, closing, pinging, and checking connection status.

etcd.go

@@ -0,0 +1,108 @@
+package reconnect
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"time"
+
+	clientv3 "go.etcd.io/etcd/client/v3"
+)
+
+// EtcdClient etcd客户端包装器
+type EtcdClient struct {
+	config clientv3.Config
+	client *clientv3.Client
+	mu     sync.RWMutex
+}
+
+// NewEtcdClient 创建新的etcd客户端
+func NewEtcdClient(config clientv3.Config) *EtcdClient {
+	return &EtcdClient{
+		config: config,
+	}
+}
+
+// Connect 建立etcd连接
+func (e *EtcdClient) Connect(ctx context.Context) error {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if e.client != nil {
+		_ = e.client.Close()
+	}
+
+	client, err := clientv3.New(e.config)
+	if err != nil {
+		return fmt.Errorf("etcd new client failed: %w", err)
+	}
+
+	// 测试连接
+	timeoutCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	_, err = client.Status(timeoutCtx, e.config.Endpoints[0])
+	if err != nil {
+		_ = client.Close()
+		return fmt.Errorf("etcd status check failed: %w", err)
+	}
+
+	e.client = client
+	return nil
+}
+
+// Close 关闭etcd连接
+func (e *EtcdClient) Close() error {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if e.client != nil {
+		err := e.client.Close()
+		e.client = nil
+		return err
+	}
+	return nil
+}
+
+// Ping 检查etcd连接是否健康
+func (e *EtcdClient) Ping(ctx context.Context) error {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	if e.client == nil {
+		return fmt.Errorf("etcd client is nil")
+	}
+
+	if len(e.config.Endpoints) == 0 {
+		return fmt.Errorf("etcd endpoints is empty")
+	}
+
+	timeoutCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	_, err := e.client.Status(timeoutCtx, e.config.Endpoints[0])
+	return err
+}
+
+// IsConnected 检查连接状态
+func (e *EtcdClient) IsConnected() bool {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	return e.client != nil
+}
+
+// GetClient 获取底层的etcd客户端
+func (e *EtcdClient) GetClient() *clientv3.Client {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	return e.client
+}
+
+// EtcdManager 创建etcd重连管理器
+func EtcdManager(config clientv3.Config, reconnectConfig *Config) *Manager {
+	client := NewEtcdClient(config)
+	return NewManager(client, reconnectConfig)
+}
+