Add PostgresClient implementation for managing PostgreSQL connections, including methods for connecting, closing, pinging, and checking connection status.

postgres.go

@@ -0,0 +1,106 @@
+package reconnect
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"sync"
+	"time"
+
+	_ "github.com/lib/pq"
+)
+
+// PostgresClient PostgreSQL客户端包装器
+type PostgresClient struct {
+	dsn    string
+	db     *sql.DB
+	mu     sync.RWMutex
+	maxAge time.Duration
+}
+
+// NewPostgresClient 创建新的PostgreSQL客户端
+func NewPostgresClient(dsn string, maxConnections int, maxIdleConnections int, maxConnectionAge time.Duration) *PostgresClient {
+	return &PostgresClient{
+		dsn:    dsn,
+		maxAge: maxConnectionAge,
+	}
+}
+
+// Connect 建立PostgreSQL连接
+func (p *PostgresClient) Connect(ctx context.Context) error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if p.db != nil {
+		_ = p.db.Close()
+	}
+
+	db, err := sql.Open("postgres", p.dsn)
+	if err != nil {
+		return fmt.Errorf("postgres open failed: %w", err)
+	}
+
+	// 设置连接池参数
+	db.SetMaxOpenConns(25)
+	db.SetMaxIdleConns(5)
+	if p.maxAge > 0 {
+		db.SetConnMaxLifetime(p.maxAge)
+	}
+
+	// 测试连接
+	if err := db.PingContext(ctx); err != nil {
+		_ = db.Close()
+		return fmt.Errorf("postgres ping failed: %w", err)
+	}
+
+	p.db = db
+	return nil
+}
+
+// Close 关闭PostgreSQL连接
+func (p *PostgresClient) Close() error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if p.db != nil {
+		err := p.db.Close()
+		p.db = nil
+		return err
+	}
+	return nil
+}
+
+// Ping 检查PostgreSQL连接是否健康
+func (p *PostgresClient) Ping(ctx context.Context) error {
+	p.mu.RLock()
+	defer p.mu.RUnlock()
+
+	if p.db == nil {
+		return fmt.Errorf("postgres db is nil")
+	}
+
+	return p.db.PingContext(ctx)
+}
+
+// IsConnected 检查连接状态
+func (p *PostgresClient) IsConnected() bool {
+	p.mu.RLock()
+	defer p.mu.RUnlock()
+
+	return p.db != nil
+}
+
+// GetDB 获取底层的数据库连接
+func (p *PostgresClient) GetDB() *sql.DB {
+	p.mu.RLock()
+	defer p.mu.RUnlock()
+
+	return p.db
+}
+
+// PostgresManager 创建PostgreSQL重连管理器
+func PostgresManager(dsn string, maxConnections int, maxIdleConnections int, maxConnectionAge time.Duration, config *Config) *Manager {
+	client := NewPostgresClient(dsn, maxConnections, maxIdleConnections, maxConnectionAge)
+	return NewManager(client, config)
+}
+