How to use Close method of gcs Package

Best Syzkaller code snippet using gcs.Close

file_resource.go

Source:file_resource.go

...38	name     string39	fileMode os.FileMode40	currentGcsSize int6441	offset         int6442	reader         io.ReadCloser43	writer         io.WriteCloser44	closed bool45}46func (o *gcsFileResource) Close() error {47	o.closed = true48	// TODO rawGcsObjectsMap ?49	return o.maybeCloseIo()50}51func (o *gcsFileResource) maybeCloseIo() error {52	if err := o.maybeCloseReader(); err != nil {53		return fmt.Errorf("error closing reader: %v", err)54	}55	if err := o.maybeCloseWriter(); err != nil {56		return fmt.Errorf("error closing writer: %v", err)57	}58	return nil59}60func (o *gcsFileResource) maybeCloseReader() error {61	if o.reader == nil {62		return nil63	}64	if err := o.reader.Close(); err != nil {65		return err66	}67	o.reader = nil68	return nil69}70func (o *gcsFileResource) maybeCloseWriter() error {71	if o.writer == nil {72		return nil73	}74	// In cases of partial writes (e.g. to the middle of a file stream), we need to75	// append any remaining data from the original file before we close the reader (and76	// commit the results.)77	// For small writes it can be more efficient78	// to keep the original reader but that is for another iteration79	if o.currentGcsSize > o.offset {80		currentFile, err := o.obj.NewRangeReader(o.ctx, o.offset, -1)81		if err != nil {82			return fmt.Errorf(83				"couldn't simulate a partial write; the closing (and thus"+84					" the whole file write) is NOT commited to GCS. %v", err)85		}86		if currentFile != nil && currentFile.Remain() > 0 {87			if _, err := io.Copy(o.writer, currentFile); err != nil {88				return fmt.Errorf("error writing: %v", err)89			}90		}91	}92	if err := o.writer.Close(); err != nil {93		return err94	}95	o.writer = nil96	return nil97}98func (o *gcsFileResource) ReadAt(p []byte, off int64) (n int, err error) {99	if cap(p) == 0 {100		return 0, nil101	}102	// Assume that if the reader is open; it is at the correct offset103	// a good performance assumption that we must ensure holds104	if off == o.offset && o.reader != nil {105		n, err = o.reader.Read(p)106		o.offset += int64(n)107		return n, err108	}109	// we have to check, whether it's a folder; the folder must not have an open readers, or writers though,110	// so this check should not be invoked excessively and cause too much of a performance drop111	if o.reader == nil && o.writer == nil {112		var info *FileInfo113		info, err = newFileInfo(o.name, o.fs, o.fileMode)114		if err != nil {115			return 0, err116		}117		if info.IsDir() {118			// trying to read a directory must return this119			return 0, syscall.EISDIR120		}121	}122	// If any writers have written anything; commit it first so we can read it back.123	if err = o.maybeCloseIo(); err != nil {124		return 0, err125	}126	//Then read at the correct offset.127	r, err := o.obj.NewRangeReader(o.ctx, off, -1)128	if err != nil {129		return 0, err130	}131	o.reader = r132	o.offset = off133	read, err := o.reader.Read(p)134	o.offset += int64(read)135	return read, err136}137func (o *gcsFileResource) WriteAt(b []byte, off int64) (n int, err error) {138	//If the writer is opened and at the correct offset we're good!139	if off == o.offset && o.writer != nil {140		n, err = o.writer.Write(b)141		o.offset += int64(n)142		return n, err143	}144	// Ensure readers must be re-opened and that if a writer is active at another145	// offset it is first committed before we do a "seek" below146	if err = o.maybeCloseIo(); err != nil {147		return 0, err148	}149	w := o.obj.NewWriter(o.ctx)150	// TRIGGER WARNING: This can seem like a hack but it works thanks151	// to GCS strong consistency. We will open and write to the same file; First when the152	// writer is closed will the content get committed to GCS.153	// The general idea is this:154	// Objectv1[:offset] -> Objectv2155	// newData1 -> Objectv2156	// Objectv1[offset+len(newData1):] -> Objectv2157	// Objectv2.Close158	//159	// It will however require a download and upload of the original file but it160	// can't be avoided if we should support seek-write-operations on GCS.161	objAttrs, err := o.obj.Attrs(o.ctx)162	if err != nil {163		if off > 0 {164			return 0, err // WriteAt to a non existing file165		}166		o.currentGcsSize = 0167	} else {168		o.currentGcsSize = objAttrs.Size169	}170	if off > o.currentGcsSize {171		return 0, ErrOutOfRange172	}173	if off > 0 {174		var r stiface.Reader175		r, err = o.obj.NewReader(o.ctx)176		if err != nil {177			return 0, err178		}179		if _, err = io.CopyN(w, r, off); err != nil {180			return 0, err181		}182		if err = r.Close(); err != nil {183			return 0, err184		}185	}186	o.writer = w187	o.offset = off188	written, err := o.writer.Write(b)189	o.offset += int64(written)190	return written, err191}192func min(x, y int) int {193	if x < y {194		return x195	}196	return y197}198func (o *gcsFileResource) Truncate(wantedSize int64) error {199	if wantedSize < 0 {200		return ErrOutOfRange201	}202	if err := o.maybeCloseIo(); err != nil {203		return err204	}205	r, err := o.obj.NewRangeReader(o.ctx, 0, wantedSize)206	if err != nil {207		return err208	}209	w := o.obj.NewWriter(o.ctx)210	written, err := io.Copy(w, r)211	if err != nil {212		return err213	}214	for written < wantedSize {215		//Bulk up padding writes216		paddingBytes := bytes.Repeat([]byte(" "), min(maxWriteSize, int(wantedSize-written)))217		n := 0218		if n, err = w.Write(paddingBytes); err != nil {219			return err220		}221		written += int64(n)222	}223	if err = r.Close(); err != nil {224		return fmt.Errorf("error closing reader: %v", err)225	}226	if err = w.Close(); err != nil {227		return fmt.Errorf("error closing writer: %v", err)228	}229	return nil230}...

gcs.go

Source:gcs.go

...19	client, err := g.newClient(ctx)20	if err != nil {21		return nil, err22	}23	defer client.Close()24	// Check if object exists25	_, err = client.Bucket(g.gcsConfig.Bucket).Object(key).Attrs(ctx)26	if err != nil {27		if err == storage.ErrObjectNotExist {28			return nil, ErrObjectDoesNotExist29		}30		return nil, err31	}32	rc, err := client.Bucket(g.gcsConfig.Bucket).Object(key).NewReader(ctx)33	if err != nil {34		return nil, err35	}36	defer rc.Close()37	data, err := io.ReadAll(rc)38	if err != nil {39		return nil, err40	}41	return data, nil42}43func (g *gcsStorage) Put(ctx context.Context, key string, value []byte) error {44	client, err := g.newClient(ctx)45	if err != nil {46		return err47	}48	defer client.Close()49	buf := bytes.NewBuffer(value)50	wc := client.Bucket(g.gcsConfig.Bucket).Object(key).NewWriter(ctx)51	if _, err = io.Copy(wc, buf); err != nil {52		return err53	}54	return wc.Close()55}56func (g *gcsStorage) Delete(ctx context.Context, key string) error {57	client, err := g.newClient(ctx)58	if err != nil {59		return err60	}61	defer client.Close()62	return client.Bucket(g.gcsConfig.Bucket).Object(key).Delete(ctx)63}64// newClient returns a GCS client for this storage object.65// The caller must call `defer client.Close()` on the returned storage client.66func (g *gcsStorage) newClient(ctx context.Context) (*storage.Client, error) {67	return storage.NewClient(ctx, option.WithCredentialsJSON([]byte(g.gcsConfig.ServiceAccountCredentials)))68}...

Using AI Code Generation

1import (2const (3func main() {4	ctx := context.Background()5	client, err := storage.NewClient(ctx)6	if err != nil {7		log.Fatalf("Failed to create client: %v", err)8	}9	if err := createBucket(ctx, client, bucketName); err != nil {10		log.Fatalf("Failed to create bucket: %v", err)11	}12	if err := uploadFile(ctx, client, bucketName, fileName, objectName); err != nil {13		log.Fatalf("Failed to upload file: %v", err)14	}15	if err := listFiles(ctx, client, bucketName, objectName); err != nil {16		log.Fatalf("Failed to list files: %v", err)17	}18	if err := downloadFile(ctx, client, bucketName, objectName, downloadFile); err != nil {19		log.Fatalf("Failed to download

Using AI Code Generation

1import (2func main() {3	gcs, err := storage.NewClient()4	if err != nil {5		fmt.Printf("Error: %v", err)6	}7	bucket := gcs.Bucket("golang-test-bucket")8	writer := bucket.Object("test.txt").NewWriter()9	writer.Write([]byte("Hello World!"))10	writer.Close()11}12import (13func main() {14	gcs, err := storage.NewClient()15	if err != nil {16		fmt.Printf("Error: %v", err)17	}18	bucket := gcs.Bucket("golang-test-bucket")19	writer := bucket.Object("test.txt").NewWriter()20	writer.Write([]byte("Hello World!"))21	writer.Close()22}23import (24func main() {25	gcs, err := storage.NewClient()26	if err != nil {27		fmt.Printf("Error: %v", err)28	}29	bucket := gcs.Bucket("golang-test-bucket")30	writer := bucket.Object("test.txt").NewWriter()31	writer.Write([]byte("Hello World!"))32	writer.Close()33}34import (35func main() {36	gcs, err := storage.NewClient()37	if err != nil {38		fmt.Printf("Error: %v", err)39	}40	bucket := gcs.Bucket("golang-test-bucket")41	writer := bucket.Object("test.txt").NewWriter()42	writer.Write([]byte("Hello World!"))43	writer.Close()44}45import (46func main() {47	gcs, err := storage.NewClient()48	if err != nil {49		fmt.Printf("Error: %v", err)50	}51	bucket := gcs.Bucket("g

Using AI Code Generation

1import (2func main() {3	f, err := os.Open("test.txt")4	if err != nil {5		fmt.Println(err)6	}7	defer f.Close()8}9import (10func main() {11	f, err := os.Open("test.txt")12	if err != nil {13		fmt.Println(err)14	}15	defer f.Close()16	b := make([]byte, 10)17	n, err := f.Read(b)18	if err != nil {19		fmt.Println(err)20	}21	fmt.Printf("Number of bytes read: %d22	fmt.Printf("Data read: %s23}24import (25func main() {26	f, err := os.Open("test.txt")27	if err != nil {28		fmt.Println(err)29	}30	defer f.Close()31	b := make([]byte, 10)32	n, err := f.Read(b)33	if err != nil {34		fmt.Println(err)35	}36	fmt.Printf("Number of bytes read: %d37	fmt.Printf("Data read: %s38	_, err = f.Seek(0, 0)39	if err != nil {40		fmt.Println(err)41	}42	n, err = f.Read(b)43	if err != nil {

Using AI Code Generation

1import (2func main() {3	ctx := context.Background()4	client, err := storage.NewClient(ctx)5	if err != nil {6		log.Fatalf("Failed to create client: %v", err)7	}8	bucket := client.Bucket(bucketName)9	if err := bucket.Create(ctx, projectID, nil); err != nil {10		log.Fatalf("Failed to create bucket: %v", err)11	}12}13import (14func main() {15	ctx := context.Background()16	client, err := storage.NewClient(ctx)17	if err != nil {18		log.Fatalf("Failed to create client: %v", err)19	}20	bucket := client.Bucket(bucketName)21	if err := bucket.Create(ctx, projectID, nil); err != nil {22		log.Fatalf("Failed to create bucket: %v", err)23	}24}25import (26func main() {27	ctx := context.Background()28	client, err := storage.NewClient(ctx)29	if err != nil {30		log.Fatalf("Failed to create client: %v", err)31	}

Using AI Code Generation

1import (2func main() {3	f, err := os.OpenFile("test.txt", os.O_RDWR|os.O_CREATE, 0666)4	if err != nil {5		log.Fatal("OpenFile: ", err)6	}

Using AI Code Generation

1import (2func main() {3	gcs := gcs.New()4	gcs.Open()5	gcs.Close()6	fmt.Println("done")7}8import (9func main() {10	gcs := gcs.New()11	gcs.Open()12	gcs.Close()13	fmt.Println("done")14}15import (16func main() {17	gcs := gcs.New()18	gcs.Open()19	gcs.Close()20	fmt.Println("done")21}22import (23func main() {24	gcs := gcs.New()25	gcs.Open()26	gcs.Close()27	fmt.Println("done")28}29import (30func main() {31	gcs := gcs.New()32	gcs.Open()33	gcs.Close()34	fmt.Println("done")35}36import (37func main() {38	gcs := gcs.New()39	gcs.Open()40	gcs.Close()41	fmt.Println("done")42}43import (44func main() {45	gcs := gcs.New()46	gcs.Open()47	gcs.Close()48	fmt.Println("done")49}50import (51func main() {52	gcs := gcs.New()53	gcs.Open()54	gcs.Close()55	fmt.Println("done")56}57import (58func main() {59	gcs := gcs.New()60	gcs.Open()61	gcs.Close()62	fmt.Println("done")63}

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