Fix unreadable context error in ydb.Open

CHANGELOG.md

@@ -1,3 +1,5 @@
+* Fixed `context` checking in `ydb.Open`
+
 ## v3.118.2
 * Fixed checking GRPC transport error in `discovery`
 

driver.go

@@ -280,6 +280,10 @@ func (d *Driver) Topic() topic.Client {
 //
 //nolint:nonamedreturns
 func Open(ctx context.Context, dsn string, opts ...Option) (_ *Driver, _ error) {
+	if ctx.Err() != nil {
+		return nil, xerrors.WithStackTrace(ctx.Err())
+	}
+
 	opts = append(append(make([]Option, 0, len(opts)+1), WithConnectionString(dsn)), opts...)
 
 	for parserIdx := range dsnParsers {
@@ -438,6 +442,10 @@ func (d *Driver) connect(ctx context.Context) error {
 		return xerrors.WithStackTrace(errors.New("configuration: empty database")) //nolint:err113
 	}
 
+	if ctx.Err() != nil {
+		return xerrors.WithStackTrace(ctx.Err())
+	}
+
 	if d.userInfo != nil {
 		d.config = d.config.With(config.WithCredentials(
 			credentials.NewStaticCredentials(

driver_test.go

@@ -0,0 +1,37 @@
+package ydb_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/ydb-platform/ydb-go-sdk/v3"
+	"github.com/ydb-platform/ydb-go-sdk/v3/trace"
+)
+
+func TestOpen(t *testing.T) {
+	t.Run("context already canceled", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+		cancel()
+
+		_, err := ydb.Open(ctx, "grpc://localhost:2136/local")
+		require.ErrorIs(t, err, context.Canceled)
+		assert.Regexp(t, "^context canceled at", err.Error())
+	})
+
+	t.Run("context canceled at internal connect()", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+
+		_, err := ydb.Open(ctx, "grpc://localhost:2136/local", ydb.WithTraceDriver(trace.Driver{
+			OnInit: func(disi trace.DriverInitStartInfo) func(trace.DriverInitDoneInfo) {
+				cancel()
+
+				return func(didi trace.DriverInitDoneInfo) {}
+			},
+		}))
+		require.ErrorIs(t, err, context.Canceled)
+		assert.Regexp(t, "^context canceled at", err.Error())
+	})
+}

internal/balancer/balancer.go

@@ -282,6 +282,10 @@ func makeDiscoveryFunc(
 func New(ctx context.Context, driverConfig *config.Config, pool *conn.Pool, opts ...discoveryConfig.Option) (
 	b *Balancer, finalErr error,
 ) {
+	if ctx.Err() != nil {
+		return nil, xerrors.WithStackTrace(ctx.Err())
+	}
+
 	onDone := trace.DriverOnBalancerInit(driverConfig.Trace(), &ctx,
 		stack.FunctionID("github.com/ydb-platform/ydb-go-sdk/v3/internal/balancer.New"),
 		driverConfig.Balancer().String(),

internal/balancer/balancer_test.go

@@ -8,6 +8,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/resolver"
@@ -143,3 +144,14 @@ type mockResolver struct{}
 
 func (r *mockResolver) ResolveNow(resolver.ResolveNowOptions) {}
 func (r *mockResolver) Close()                                {}
+
+func TestNew(t *testing.T) {
+	t.Run("context already canceled", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+		cancel()
+
+		_, err := New(ctx, config.New(), nil)
+		require.ErrorIs(t, err, context.Canceled)
+		assert.Regexp(t, "^context canceled at", err.Error())
+	})
+}