feat: recover addIdleConn may occur panic (#2445)

* feat: recover addIdleConn may occur panic

Signed-off-by: monkey92t <golang@88.com>

* fix test race

Signed-off-by: monkey92t <golang@88.com>

---------

Signed-off-by: monkey92t <golang@88.com>
Co-authored-by: Nedyalko Dyakov <1547186+ndyakov@users.noreply.github.com>

Author: monkey92t

internal/pool/export_test.go

@@ -12,3 +12,13 @@ func (cn *Conn) SetCreatedAt(tm time.Time) {
 func (cn *Conn) NetConn() net.Conn {
 	return cn.netConn
 }
+
+func (p *ConnPool) CheckMinIdleConns() {
+	p.connsMu.Lock()
+	p.checkMinIdleConns()
+	p.connsMu.Unlock()
+}
+
+func (p *ConnPool) QueueLen() int {
+	return len(p.queue)
+}

internal/pool/pool.go

@@ -130,6 +130,18 @@ func (p *ConnPool) checkMinIdleConns() {
 			p.idleConnsLen++
 
 			go func() {
+				defer func() {
+					if err := recover(); err != nil {
+						p.connsMu.Lock()
+						p.poolSize--
+						p.idleConnsLen--
+						p.connsMu.Unlock()
+
+						p.freeTurn()
+						internal.Logger.Printf(context.Background(), "addIdleConn panic: %+v", err)
+					}
+				}()
+
 				err := p.addIdleConn()
 				if err != nil && err != ErrClosed {
 					p.connsMu.Lock()

internal/pool/pool_test.go

@@ -361,6 +361,24 @@ var _ = Describe("race", func() {
 		Expect(stats.TotalConns).To(Equal(uint32(opt.PoolSize)))
 	})
 
+	It("recover addIdleConn panic", func() {
+		opt := &pool.Options{
+			Dialer: func(ctx context.Context) (net.Conn, error) {
+				panic("test panic")
+			},
+			PoolSize:     100,
+			MinIdleConns: 30,
+		}
+		p := pool.NewConnPool(opt)
+
+		p.CheckMinIdleConns()
+
+		Eventually(func() bool {
+			state := p.Stats()
+			return state.TotalConns == 0 && state.IdleConns == 0 && p.QueueLen() == 0
+		}, "3s", "50ms").Should(BeTrue())
+  })
+  
 	It("wait", func() {
 		opt := &pool.Options{
 			Dialer: func(ctx context.Context) (net.Conn, error) {