Handle epipe errors

Presently, if the tcp session to the server closes, we will emit
broken pipe errors potentially until we reach ConnMaxLifetime.

Since EPIPE means that the tcp session is dead (ie we received a
RST packet from the server), there is no point in attempting to
proceed past that point: set the connection as closed.

conn.go

@@ -20,12 +20,14 @@ package clickhouse
 import (
 	"context"
 	"crypto/tls"
+	"database/sql/driver"
 	"fmt"
 	"github.com/ClickHouse/clickhouse-go/v2/resources"
 	"github.com/pkg/errors"
 	"log"
 	"net"
 	"os"
+	"syscall"
 	"time"
 
 	"github.com/ClickHouse/ch-go/compress"
@@ -226,6 +228,11 @@ func (c *connect) sendData(block *proto.Block, name string) error {
 		return err
 	}
 	if err := c.flush(); err != nil {
+		if errors.Is(err, syscall.EPIPE) {
+			c.debugf("[send data] pipe is broken, closing connection")
+			c.closed = true
+			return driver.ErrBadConn
+		}
 		return err
 	}
 	defer func() {