Improve timeouts implementation

- use local attributes for timeouts
- do not type assert to net.Conn each time
- DSN params are CamelCase

benchmark_test.go

@@ -215,16 +215,14 @@ func BenchmarkRoundtripBin(b *testing.B) {
 }
 
 func BenchmarkInterpolation(b *testing.B) {
-	cfg := &config{
-		interpolateParams: true,
-		loc:               time.UTC,
-	}
-
 	mc := &mysqlConn{
-		cfg:              cfg,
+		cfg: &config{
+			interpolateParams: true,
+			loc:               time.UTC,
+		},
 		maxPacketAllowed: maxPacketSize,
 		maxWriteSize:     maxPacketSize - 1,
-		buf:              newBuffer(nil, cfg),
+		buf:              newBuffer(nil),
 	}
 
 	args := []driver.Value{

buffer.go

@@ -8,9 +8,11 @@
 
 package mysql
 
-import "io"
-import "net"
-import "time"
+import (
+	"io"
+	"net"
+	"time"
+)
 
 const defaultBufSize = 4096
 
@@ -20,19 +22,18 @@ const defaultBufSize = 4096
 // The buffer is similar to bufio.Reader / Writer but zero-copy-ish
 // Also highly optimized for this particular use case.
 type buffer struct {
-	buf    []byte
-	rd     io.Reader
-	idx    int
-	length int
-	cfg    *config
+	buf     []byte
+	nc      net.Conn
+	idx     int
+	length  int
+	timeout time.Duration
 }
 
-func newBuffer(rd io.Reader, cfg *config) buffer {
+func newBuffer(nc net.Conn) buffer {
 	var b [defaultBufSize]byte
 	return buffer{
 		buf: b[:],
-		rd:  rd,
-		cfg: cfg,
+		nc:  nc,
 	}
 }
 
@@ -58,13 +59,13 @@ func (b *buffer) fill(need int) error {
 	b.idx = 0
 
 	for {
-		if conn, ok := b.rd.(net.Conn); ok && b.cfg.readTimeout > 0 {
-			if err := conn.SetReadDeadline(time.Now().Add(b.cfg.readTimeout)); err != nil {
+		if b.timeout > 0 {
+			if err := b.nc.SetReadDeadline(time.Now().Add(b.timeout)); err != nil {
 				return err
 			}
 		}
 
-		nn, err := b.rd.Read(b.buf[n:])
+		nn, err := b.nc.Read(b.buf[n:])
 		n += nn
 
 		switch err {

connection.go

@@ -26,6 +26,7 @@ type mysqlConn struct {
 	cfg              *config
 	maxPacketAllowed int
 	maxWriteSize     int
+	writeTimeout     time.Duration
 	flags            clientFlag
 	status           statusFlag
 	sequence         uint8
@@ -131,7 +132,7 @@ func (mc *mysqlConn) Close() (err error) {
 	}
 
 	mc.cfg = nil
-	mc.buf.rd = nil
+	mc.buf.nc = nil
 
 	return
 }

driver.go

@@ -79,7 +79,11 @@ func (d MySQLDriver) Open(dsn string) (driver.Conn, error) {
 		}
 	}
 
-	mc.buf = newBuffer(mc.netConn, mc.cfg)
+	mc.buf = newBuffer(mc.netConn)
+
+	// Set I/O timeouts
+	mc.buf.timeout = mc.cfg.readTimeout
+	mc.writeTimeout = mc.cfg.writeTimeout
 
 	// Reading Handshake Initialization Packet
 	cipher, err := mc.readInitPacket()

packets.go

@@ -100,8 +100,8 @@ func (mc *mysqlConn) writePacket(data []byte) error {
 		data[3] = mc.sequence
 
 		// Write packet
-		if mc.cfg.writeTimeout > 0 {
-			if err := mc.netConn.SetWriteDeadline(time.Now().Add(mc.cfg.writeTimeout)); err != nil {
+		if mc.writeTimeout > 0 {
+			if err := mc.netConn.SetWriteDeadline(time.Now().Add(mc.writeTimeout)); err != nil {
 				return err
 			}
 		}
@@ -284,7 +284,7 @@ func (mc *mysqlConn) writeAuthPacket(cipher []byte) error {
 			return err
 		}
 		mc.netConn = tlsConn
-		mc.buf.rd = tlsConn
+		mc.buf.nc = tlsConn
 	}
 
 	// Filler [23 bytes] (all 0x00)

utils.go

@@ -260,14 +260,15 @@ func parseDSNParams(cfg *config, params string) (err error) {
 				return
 			}
 
-		// I/O Timeouts
-		case "read_timeout":
+		// I/O Read Timeout
+		case "readTimeout":
 			cfg.readTimeout, err = time.ParseDuration(value)
 			if err != nil {
 				return
 			}
 
-		case "write_timeout":
+		// I/O Write Timeout
+		case "writeTimeout":
 			cfg.writeTimeout, err = time.ParseDuration(value)
 			if err != nil {
 				return

utils_test.go

@@ -27,7 +27,7 @@ var testDSNs = []struct {
 	{"user@unix(/path/to/socket)/dbname?charset=utf8", "&{user:user passwd: net:unix addr:/path/to/socket dbname:dbname params:map[charset:utf8] loc:%p tls:<nil> timeout:0 readTimeout:0 writeTimeout:0 collation:33 allowAllFiles:false allowOldPasswords:false allowCleartextPasswords:false clientFoundRows:false columnsWithAlias:false interpolateParams:false}", time.UTC},
 	{"user:password@tcp(localhost:5555)/dbname?charset=utf8&tls=true", "&{user:user passwd:password net:tcp addr:localhost:5555 dbname:dbname params:map[charset:utf8] loc:%p tls:<nil> timeout:0 readTimeout:0 writeTimeout:0 collation:33 allowAllFiles:false allowOldPasswords:false allowCleartextPasswords:false clientFoundRows:false columnsWithAlias:false interpolateParams:false}", time.UTC},
 	{"user:password@tcp(localhost:5555)/dbname?charset=utf8mb4,utf8&tls=skip-verify", "&{user:user passwd:password net:tcp addr:localhost:5555 dbname:dbname params:map[charset:utf8mb4,utf8] loc:%p tls:<nil> timeout:0 readTimeout:0 writeTimeout:0 collation:33 allowAllFiles:false allowOldPasswords:false allowCleartextPasswords:false clientFoundRows:false columnsWithAlias:false interpolateParams:false}", time.UTC},
-	{"user:password@/dbname?loc=UTC&timeout=30s&read_timeout=1s&write_timeout=1s&allowAllFiles=1&clientFoundRows=true&allowOldPasswords=TRUE&collation=utf8mb4_unicode_ci", "&{user:user passwd:password net:tcp addr:127.0.0.1:3306 dbname:dbname params:map[] loc:%p tls:<nil> timeout:30000000000 readTimeout:1000000000 writeTimeout:1000000000 collation:224 allowAllFiles:true allowOldPasswords:true allowCleartextPasswords:false clientFoundRows:true columnsWithAlias:false interpolateParams:false}", time.UTC},
+	{"user:password@/dbname?loc=UTC&timeout=30s&readTimeout=1s&writeTimeout=1s&allowAllFiles=1&clientFoundRows=true&allowOldPasswords=TRUE&collation=utf8mb4_unicode_ci", "&{user:user passwd:password net:tcp addr:127.0.0.1:3306 dbname:dbname params:map[] loc:%p tls:<nil> timeout:30000000000 readTimeout:1000000000 writeTimeout:1000000000 collation:224 allowAllFiles:true allowOldPasswords:true allowCleartextPasswords:false clientFoundRows:true columnsWithAlias:false interpolateParams:false}", time.UTC},
 	{"user:p@ss(word)@tcp([de:ad:be:ef::ca:fe]:80)/dbname?loc=Local", "&{user:user passwd:p@ss(word) net:tcp addr:[de:ad:be:ef::ca:fe]:80 dbname:dbname params:map[] loc:%p tls:<nil> timeout:0 readTimeout:0 writeTimeout:0 collation:33 allowAllFiles:false allowOldPasswords:false allowCleartextPasswords:false clientFoundRows:false columnsWithAlias:false interpolateParams:false}", time.Local},
 	{"/dbname", "&{user: passwd: net:tcp addr:127.0.0.1:3306 dbname:dbname params:map[] loc:%p tls:<nil> timeout:0 readTimeout:0 writeTimeout:0 collation:33 allowAllFiles:false allowOldPasswords:false allowCleartextPasswords:false clientFoundRows:false columnsWithAlias:false interpolateParams:false}", time.UTC},
 	{"@/", "&{user: passwd: net:tcp addr:127.0.0.1:3306 dbname: params:map[] loc:%p tls:<nil> timeout:0 readTimeout:0 writeTimeout:0 collation:33 allowAllFiles:false allowOldPasswords:false allowCleartextPasswords:false clientFoundRows:false columnsWithAlias:false interpolateParams:false}", time.UTC},