implement RegisterDialContext.

connector.go

@@ -33,12 +33,11 @@ func (c *connector) Connect(ctx context.Context) (driver.Conn, error) {
 	mc.parseTime = mc.cfg.ParseTime
 
 	// Connect to Server
-	// TODO: needs RegisterDialContext
 	dialsLock.RLock()
 	dial, ok := dials[mc.cfg.Net]
 	dialsLock.RUnlock()
 	if ok {
-		mc.netConn, err = dial(mc.cfg.Addr)
+		mc.netConn, err = dial(ctx, mc.cfg.Addr)
 	} else {
 		nd := net.Dialer{Timeout: mc.cfg.Timeout}
 		mc.netConn, err = nd.DialContext(ctx, mc.cfg.Net, mc.cfg.Addr)

driver.go

@@ -21,6 +21,7 @@ import (
 	"database/sql"
 	"database/sql/driver"
 	"net"
+	pkgnet "net"
 	"sync"
 )
 
@@ -32,19 +33,33 @@ type MySQLDriver struct{}
 // Custom dial functions must be registered with RegisterDial
 type DialFunc func(addr string) (net.Conn, error)
 
+// DialContextFunc is a function which can be used to establish the network connection using the provided context.
+// Custom dial functions must be registered with RegisterDialContext
+type DialContextFunc func(ctx context.Context, addr string) (net.Conn, error)
+
 var (
 	dialsLock sync.RWMutex
-	dials     map[string]DialFunc
+	dials     map[string]DialContextFunc
 )
 
 // RegisterDial registers a custom dial function. It can then be used by the
 // network address mynet(addr), where mynet is the registered new network.
 // addr is passed as a parameter to the dial function.
 func RegisterDial(net string, dial DialFunc) {
+	dialContext := DialContextFunc(func(ctx context.Context, addr string) (pkgnet.Conn, error) {
+		return dial(addr)
+	})
+	RegisterDialContext(net, dialContext)
+}
+
+// RegisterDialContext registers a custom dial function. It can then be used by the
+// network address mynet(addr), where mynet is the registered new network.
+// addr is passed as a parameter to the dial function.
+func RegisterDialContext(net string, dial DialContextFunc) {
 	dialsLock.Lock()
 	defer dialsLock.Unlock()
 	if dials == nil {
-		dials = make(map[string]DialFunc)
+		dials = make(map[string]DialContextFunc)
 	}
 	dials[net] = dial
 }