How to use Reader method of gcs Package

Best Syzkaller code snippet using gcs.Reader

gcs.go

Source:gcs.go Github

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...103}104// ReadFile reads the file from the storage and returns the contents.105func (s *gcsStorage) ReadFile(ctx context.Context, name string) ([]byte, error) {106 object := s.objectName(name)107 rc, err := s.bucket.Object(object).NewReader(ctx)108 if err != nil {109 return nil, errors.Annotatef(err,110 "failed to read gcs file, file info: input.bucket='%s', input.key='%s'",111 s.gcs.Bucket, object)112 }113 defer rc.Close()114 size := rc.Attrs.Size115 var b []byte116 if size < 0 {117 // happened when using fake-gcs-server in integration test118 b, err = io.ReadAll(rc)119 } else {120 b = make([]byte, size)121 _, err = io.ReadFull(rc, b)122 }123 return b, errors.Trace(err)124}125// FileExists return true if file exists.126func (s *gcsStorage) FileExists(ctx context.Context, name string) (bool, error) {127 object := s.objectName(name)128 _, err := s.bucket.Object(object).Attrs(ctx)129 if err != nil {130 if errors.Cause(err) == storage.ErrObjectNotExist { // nolint:errorlint131 return false, nil132 }133 return false, errors.Trace(err)134 }135 return true, nil136}137// Open a Reader by file path.138func (s *gcsStorage) Open(ctx context.Context, path string) (ExternalFileReader, error) {139 object := s.objectName(path)140 handle := s.bucket.Object(object)141 rc, err := handle.NewRangeReader(ctx, 0, -1)142 if err != nil {143 return nil, errors.Annotatef(err,144 "failed to read gcs file, file info: input.bucket='%s', input.key='%s'",145 s.gcs.Bucket, path)146 }147 return &gcsObjectReader{148 storage: s,149 name: path,150 objHandle: handle,151 reader: rc,152 ctx: ctx,153 }, nil154}155// WalkDir traverse all the files in a dir.156//157// fn is the function called for each regular file visited by WalkDir.158// The first argument is the file path that can be used in `Open`159// function; the second argument is the size in byte of the file determined160// by path.161func (s *gcsStorage) WalkDir(ctx context.Context, opt *WalkOption, fn func(string, int64) error) error {162 if opt == nil {163 opt = &WalkOption{}164 }165 if len(opt.ObjPrefix) != 0 {166 return errors.New("gcs storage not support ObjPrefix for now")167 }168 prefix := path.Join(s.gcs.Prefix, opt.SubDir)169 if len(prefix) > 0 && !strings.HasSuffix(prefix, "/") {170 prefix += "/"171 }172 query := &storage.Query{Prefix: prefix}173 // only need each object's name and size174 err := query.SetAttrSelection([]string{"Name", "Size"})175 if err != nil {176 return errors.Trace(err)177 }178 iter := s.bucket.Objects(ctx, query)179 for {180 attrs, err := iter.Next()181 if err == iterator.Done {182 break183 }184 if err != nil {185 return errors.Trace(err)186 }187 // when walk on specify directory, the result include storage.Prefix,188 // which can not be reuse in other API(Open/Read) directly.189 // so we use TrimPrefix to filter Prefix for next Open/Read.190 path := strings.TrimPrefix(attrs.Name, s.gcs.Prefix)191 // trim the prefix '/' to ensure that the path returned is consistent with the local storage192 path = strings.TrimPrefix(path, "/")193 if err = fn(path, attrs.Size); err != nil {194 return errors.Trace(err)195 }196 }197 return nil198}199func (s *gcsStorage) URI() string {200 return "gcs://" + s.gcs.Bucket + "/" + s.gcs.Prefix201}202// Create implements ExternalStorage interface.203func (s *gcsStorage) Create(ctx context.Context, name string) (ExternalFileWriter, error) {204 object := s.objectName(name)205 wc := s.bucket.Object(object).NewWriter(ctx)206 wc.StorageClass = s.gcs.StorageClass207 wc.PredefinedACL = s.gcs.PredefinedAcl208 return newFlushStorageWriter(wc, &emptyFlusher{}, wc), nil209}210// Rename file name from oldFileName to newFileName.211func (s *gcsStorage) Rename(ctx context.Context, oldFileName, newFileName string) error {212 data, err := s.ReadFile(ctx, oldFileName)213 if err != nil {214 return errors.Trace(err)215 }216 err = s.WriteFile(ctx, newFileName, data)217 if err != nil {218 return errors.Trace(err)219 }220 return s.DeleteFile(ctx, oldFileName)221}222func newGCSStorage(ctx context.Context, gcs *backuppb.GCS, opts *ExternalStorageOptions) (*gcsStorage, error) {223 var clientOps []option.ClientOption224 if opts.NoCredentials {225 clientOps = append(clientOps, option.WithoutAuthentication())226 } else {227 if gcs.CredentialsBlob == "" {228 creds, err := google.FindDefaultCredentials(ctx, storage.ScopeReadWrite)229 if err != nil {230 return nil, errors.Annotatef(berrors.ErrStorageInvalidConfig, "%v Or you should provide '--gcs.credentials_file'", err)231 }232 if opts.SendCredentials {233 if len(creds.JSON) > 0 {234 gcs.CredentialsBlob = string(creds.JSON)235 } else {236 return nil, errors.Annotate(berrors.ErrStorageInvalidConfig,237 "You should provide '--gcs.credentials_file' when '--send-credentials-to-tikv' is true")238 }239 }240 if creds != nil {241 clientOps = append(clientOps, option.WithCredentials(creds))242 }243 } else {244 clientOps = append(clientOps, option.WithCredentialsJSON([]byte(gcs.GetCredentialsBlob())))245 }246 }247 if gcs.Endpoint != "" {248 clientOps = append(clientOps, option.WithEndpoint(gcs.Endpoint))249 }250 if opts.HTTPClient != nil {251 clientOps = append(clientOps, option.WithHTTPClient(opts.HTTPClient))252 }253 client, err := storage.NewClient(ctx, clientOps...)254 if err != nil {255 return nil, errors.Trace(err)256 }257 if !opts.SendCredentials {258 // Clear the credentials if exists so that they will not be sent to TiKV259 gcs.CredentialsBlob = ""260 }261 bucket := client.Bucket(gcs.Bucket)262 // check whether it's a bug before #647, to solve case #2263 // If the storage is set as gcs://bucket/prefix/,264 // the backupmeta is written correctly to gcs://bucket/prefix/backupmeta,265 // but the SSTs are written wrongly to gcs://bucket/prefix//*.sst (note the extra slash).266 // see details about case 2 at https://github.com/pingcap/br/issues/675#issuecomment-753780742267 sstInPrefix := hasSSTFiles(ctx, bucket, gcs.Prefix)268 sstInPrefixSlash := hasSSTFiles(ctx, bucket, gcs.Prefix+"//")269 if sstInPrefixSlash && !sstInPrefix {270 // This is a old bug, but we must make it compatible.271 // so we need find sst in slash directory272 gcs.Prefix += "//"273 }274 return &gcsStorage{gcs: gcs, bucket: bucket}, nil275}276func hasSSTFiles(ctx context.Context, bucket *storage.BucketHandle, prefix string) bool {277 query := storage.Query{Prefix: prefix}278 _ = query.SetAttrSelection([]string{"Name"})279 it := bucket.Objects(ctx, &query)280 for {281 attrs, err := it.Next()282 if err == iterator.Done { // nolint:errorlint283 break284 }285 if err != nil {286 log.Warn("failed to list objects on gcs, will use default value for `prefix`", zap.Error(err))287 break288 }289 if strings.HasSuffix(attrs.Name, ".sst") {290 log.Info("sst file found in prefix slash", zap.String("file", attrs.Name))291 return true292 }293 }294 return false295}296// gcsObjectReader wrap storage.Reader and add the `Seek` method.297type gcsObjectReader struct {298 storage *gcsStorage299 name string300 objHandle *storage.ObjectHandle301 reader io.ReadCloser302 pos int64303 // reader context used for implement `io.Seek`304 // currently, lightning depends on package `xitongsys/parquet-go` to read parquet file and it needs `io.Seeker`305 // See: https://github.com/xitongsys/parquet-go/blob/207a3cee75900b2b95213627409b7bac0f190bb3/source/source.go#L9-L10306 ctx context.Context307}308// Read implement the io.Reader interface.309func (r *gcsObjectReader) Read(p []byte) (n int, err error) {310 if r.reader == nil {311 rc, err := r.objHandle.NewRangeReader(r.ctx, r.pos, -1)312 if err != nil {313 return 0, errors.Annotatef(err,314 "failed to read gcs file, file info: input.bucket='%s', input.key='%s'",315 r.storage.gcs.Bucket, r.name)316 }317 r.reader = rc318 }319 n, err = r.reader.Read(p)320 r.pos += int64(n)321 return n, err322}323// Close implement the io.Closer interface.324func (r *gcsObjectReader) Close() error {325 if r.reader == nil {326 return nil327 }328 return r.reader.Close()329}330// Seek implement the io.Seeker interface.331//332// Currently, tidb-lightning depends on this method to read parquet file for gcs storage.333func (r *gcsObjectReader) Seek(offset int64, whence int) (int64, error) {334 var realOffset int64335 switch whence {336 case io.SeekStart:337 if offset < 0 {338 return 0, errors.Annotatef(berrors.ErrInvalidArgument, "Seek: offset '%v' out of range.", offset)339 }340 realOffset = offset341 case io.SeekCurrent:342 realOffset = r.pos + offset343 if r.pos < 0 && realOffset >= 0 {344 return 0, errors.Annotatef(berrors.ErrInvalidArgument, "Seek: offset '%v' out of range. current pos is '%v'.", offset, r.pos)345 }346 case io.SeekEnd:347 if offset >= 0 {348 return 0, errors.Annotatef(berrors.ErrInvalidArgument, "Seek: offset '%v' should be negative.", offset)349 }350 // GCS supports `NewRangeReader(ctx, -10, -1)`, which means read the last 10 bytes.351 realOffset = offset352 default:353 return 0, errors.Annotatef(berrors.ErrStorageUnknown, "Seek: invalid whence '%d'", whence)354 }355 if realOffset == r.pos {356 return realOffset, nil357 }358 _ = r.reader.Close()359 r.pos = realOffset360 rc, err := r.objHandle.NewRangeReader(r.ctx, r.pos, -1)361 if err != nil {362 return 0, errors.Annotatef(err,363 "failed to read gcs file, file info: input.bucket='%s', input.key='%s'",364 r.storage.gcs.Bucket, r.name)365 }366 r.reader = rc367 return realOffset, nil368}...

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store.go

Source:store.go Github

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...55 return false, err56 }57 return true, nil58}59type gcsReader struct {60 g *gcs61 objectName string62 objectReader io.ReadCloser63}64func (r *gcsReader) WriteTo(writer io.Writer) (n int64, err error) {65 return storage.PipeIO(writer, r.objectReader)66}67func (r *gcsReader) Close() error {68 return r.objectReader.Close()69}70func (r *gcsReader) Read(p []byte) (n int, err error) {71 read, err := r.objectReader.Read(p)72 return read, err73}74func (r *gcsReader) ReadAt(p []byte, offset int64) (n int, err error) {75 objectReader, err := r.g.readOnlyClient.Bucket(r.g.bucket).Object(r.objectName).NewRangeReader(76 r.g.ctx, offset, int64(len(p)))77 if err != nil {78 return 0, err79 }80 return objectReader.Read(p)81}82func toSentinelErrors(err error) error {83 // return sentinel errors defined by the status package84 if strings.Contains(err.Error(), "object doesn't exist") {85 return status.ErrNotExists86 }87 return err88}89func (g *gcs) Get(ctx context.Context, objectName string) (io.ReadCloser, error) {90 objectReader, err := g.readOnlyClient.Bucket(g.bucket).Object(objectName).NewReader(ctx)91 if err != nil {92 return nil, toSentinelErrors(err)93 }94 return &gcsReader{95 g: g,96 objectReader: objectReader,97 }, nil98}99func (g *gcs) GetAttr(ctx context.Context, objectName string) (storage.Attributes, error) {100 attr, err := g.readOnlyClient.Bucket(g.bucket).Object(objectName).Attrs(ctx)101 if err != nil {102 return storage.Attributes{}, err103 }104 return storage.Attributes{105 Created: attr.Created,106 Updated: attr.Updated,107 Owner: attr.Owner,108 }, nil109}110func (g *gcs) GetAt(ctx context.Context, objectName string) (io.ReaderAt, error) {111 return &gcsReader{112 g: g,113 objectName: objectName,114 }, nil115}116func (g *gcs) Touch(ctx context.Context, objectName string) error {117 _, err := g.client.Bucket(g.bucket).Object(objectName).Update(ctx, gcsStorage.ObjectAttrsToUpdate{})118 return err119}120type readCloser struct {121 reader io.Reader122}123func (rc readCloser) Read(p []byte) (n int, err error) {124 return rc.reader.Read(p)125}126func (rc readCloser) Close() error {127 return nil128}129func (g *gcs) Put(ctx context.Context, objectName string, reader io.Reader, newObject storage.NewKey) error {130 // Put if not present131 var writer *gcsStorage.Writer132 b := false133 if newObject {134 b = true135 }136 if newObject {137 writer = g.client.Bucket(g.bucket).Object(objectName).If(gcsStorage.Conditions{138 DoesNotExist: b,139 }).NewWriter(ctx)140 } else {141 writer = g.client.Bucket(g.bucket).Object(objectName).NewWriter(ctx)142 }143 _, err := storage.PipeIO(writer, readCloser{reader: reader})144 if err != nil {145 return err146 }147 return writer.Close()148}149func (g *gcs) PutCRC(ctx context.Context, objectName string, reader io.Reader, doesNotExist bool, crc uint32) error {150 // Put if not present151 var writer *gcsStorage.Writer152 if doesNotExist {153 writer = g.client.Bucket(g.bucket).Object(objectName).If(gcsStorage.Conditions{154 DoesNotExist: doesNotExist,155 }).NewWriter(ctx)156 } else {157 writer = g.client.Bucket(g.bucket).Object(objectName).NewWriter(ctx)158 }159 writer.CRC32C = crc160 _, err := storage.PipeIO(writer, readCloser{reader: reader})161 if err != nil {162 return err163 }...

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gcs_reader.go

Source:gcs_reader.go Github

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...18 "io"19 "github.com/coreos/etcd-operator/pkg/backup/util"20 "cloud.google.com/go/storage"21)22// ensure gcsReader satisfies reader interface.23var _ Reader = &gcsReader{}24// gcsReader provides Reader implementation for reading a file from GCS25type gcsReader struct {26 ctx context.Context27 gcs *storage.Client28}29// NewGCSReader return a Reader implementation to read a file from GCS in the form of gcsReader30func NewGCSReader(ctx context.Context, gcs *storage.Client) Reader {31 return &gcsReader{ctx, gcs}32}33// Open opens the file on path where path must be in the format "<gcs-bucket-name>/<key>"34func (gcsr *gcsReader) Open(path string) (io.ReadCloser, error) {35 bucket, key, err := util.ParseBucketAndKey(path)36 if err != nil {37 return nil, fmt.Errorf("failed to parse gcs bucket and key: %v", err)38 }39 return gcsr.gcs.Bucket(bucket).Object(key).NewReader(gcsr.ctx)40}...

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Reader

Using AI Code Generation

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1import (2func main() {3 ctx := context.Background()4 client, err := storage.NewClient(ctx)5 if err != nil {6 log.Fatal(err)7 }8 bucket := client.Bucket("my-bucket")9 object := bucket.Object("my-object")10 rc, err := object.NewReader(ctx)11 if err != nil {12 log.Fatal(err)13 }14 defer rc.Close()15 buf := make([]byte, 1024)16 for {17 n, err := rc.Read(buf)18 if err == io.EOF {19 }20 if err != nil {21 log.Fatal(err)22 }23 fmt.Println(string(buf[:n]))24 }25}26import (27func main() {28 ctx := context.Background()29 client, err := storage.NewClient(ctx)30 if err != nil {31 log.Fatal(err)32 }33 bucket := client.Bucket("my-bucket")34 object := bucket.Object("my-object")35 wc := object.NewWriter(ctx)36 wc.ACL = []storage.ACLRule{{Entity: storage.AllUsers, Role: storage.RoleReader}}37 if _, err := io.Copy(wc, strings.NewReader("Hello World")); err != nil {38 log.Fatal(err)39 }40 if err := wc.Close(); err != nil {41 log.Fatal(err)42 }43}44import (45func main() {46 ctx := context.Background()47 client, err := storage.NewClient(ctx)48 if err != nil {49 log.Fatal(err)50 }51 bucket := client.Bucket("my-bucket")52 object := bucket.Object("my-object")53 if err := object.Delete(ctx); err != nil {54 log.Fatal(err)55 }56}57import (58func main() {59 ctx := context.Background()

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Reader

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1import (2func main() {3 ctx := context.Background()4 client, err := storage.NewClient(ctx, option.WithServiceAccountFile("/home/username/service_account.json"))5 if err != nil {6 fmt.Println("Error creating client")7 fmt.Println(err)8 os.Exit(1)9 }10 bucket := client.Bucket("my-bucket")11 object := bucket.Object("my-object")12 r, err := object.NewReader(ctx)13 if err != nil {14 fmt.Println("Error creating reader")15 fmt.Println(err)16 os.Exit(1)17 }18 defer r.Close()19 if _, err := io.Copy(os.Stdout, r); err != nil {20 fmt.Println("Error copying object")21 fmt.Println(err)22 os.Exit(1)23 }24}25const {Storage} = require('@google-cloud/storage');26const storage = new Storage();27exports.helloGCS = (event, context) => {28 const file = event.data;29 console.log(`File ${file.name} uploaded.`);30};

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Reader

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1import (2type GCS struct {3}4func NewGCS(ctx context.Context, projectID, bucketName string) (*GCS, error) {5 client, err := storage.NewClient(ctx, option.WithScopes(storage.ScopeFullControl))6 if err != nil {7 }8 return &GCS{9 bucket: client.Bucket(bucketName),10 }, nil11}12func main() {13 jsonKey := os.Getenv("GOOGLE_APPLICATION_CREDENTIALS")14 if jsonKey == "" {15 log.Fatal("GOOGLE_APPLICATION_CREDENTIALS environment variable must be set.")16 }17 ctx := context.Background()18 client, err := google.DefaultClient(ctx, storage.ScopeFullControl)19 if err != nil {20 log.Fatalf("Unable to get authenticated client: %v", err)21 }22 gcs, err := NewGCS(ctx, "my-project", "my-bucket")23 if err != nil {24 log.Fatalf("Unable to create gcs client: %v", err)25 }26 f, err := os.Create("test.txt")27 if err != nil {28 log.Fatalf("Failed to create file: %v", err)29 }30 defer f.Close()31 if _, err := f.Write([]byte("Hello GCS!")); err != nil {32 log.Fatalf("Failed to write to file: %v", err)33 }34 wc := gcs.bucket.Object("test.txt").NewWriter(ctx)35 if _, err := io.Copy(wc, f); err != nil {36 log.Fatalf("Failed to upload file: %v", err)37 }38 if err := wc.Close(); err != nil {39 log.Fatalf("Failed to close: %v

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Reader

Using AI Code Generation

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1func main() {2 ctx := context.Background()3 client, err := storage.NewClient(ctx)4 if err != nil {5 log.Fatal(err)6 }7 defer client.Close()8 bucket := client.Bucket("bucket-name")9 object := bucket.Object("object-name")10 r, err := object.NewReader(ctx)11 if err != nil {12 log.Fatal(err)13 }14 defer r.Close()15 if _, err := io.Copy(os.Stdout, r); err != nil {16 log.Fatal(err)17 }18}19func main() {20 ctx := context.Background()21 client, err := storage.NewClient(ctx)22 if err != nil {23 log.Fatal(err)24 }25 defer client.Close()26 bucket := client.Bucket("bucket-name")27 object := bucket.Object("object-name")28 r, err := object.NewReader(ctx)29 if err != nil {30 log.Fatal(err)31 }32 defer r.Close()33 if _, err := io.Copy(os.Stdout, r); err != nil {34 log.Fatal(err)35 }36}37func main() {38 ctx := context.Background()39 client, err := storage.NewClient(ctx)40 if err != nil {41 log.Fatal(err)42 }43 defer client.Close()44 bucket := client.Bucket("bucket-name")45 object := bucket.Object("object-name")46 r, err := object.NewReader(ctx)47 if err != nil {48 log.Fatal(err)49 }50 defer r.Close()51 if _, err := io.Copy(os.Stdout, r); err != nil {52 log.Fatal(err)53 }54}55func main() {56 ctx := context.Background()57 client, err := storage.NewClient(ctx)58 if err != nil {59 log.Fatal(err)60 }61 defer client.Close()62 bucket := client.Bucket("bucket-name")63 object := bucket.Object("object-name")64 r, err := object.NewReader(ctx)65 if err != nil {66 log.Fatal(err)67 }68 defer r.Close()69 if _, err := io.Copy(os.Stdout, r); err != nil {70 log.Fatal(err)71 }72}

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Reader

Using AI Code Generation

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1import (2func main() {3 ctx := context.Background()4 client, err := storage.NewClient(ctx)5 if err != nil {6 fmt.Println("error:", err)7 }8 defer client.Close()9 reader, err := client.Bucket(bucket).Object(file).NewReader(ctx)10 if err != nil {11 fmt.Println("error:", err)12 }13 defer reader.Close()14 buf := make([]byte, 1024)15 for {16 n, err := reader.Read(buf)17 if err != nil {18 }19 fmt.Print(string(buf[:n]))20 }21}22import (23func main() {24 ctx := context.Background()25 client, err := storage.NewClient(ctx)26 if err != nil {27 fmt.Println("error:", err)28 }29 defer client.Close()30 reader, err := client.Bucket(bucket).Object(file).NewReader(ctx)31 if err != nil {32 fmt.Println("error:", err)33 }34 defer reader.Close()35 buf := make([]byte, 1024)36 for {37 n, err := reader.Read(buf)38 if err != nil {39 }40 fmt.Print(string(buf[:n]))41 }42}43import (44func main() {45 ctx := context.Background()46 client, err := storage.NewClient(ctx)47 if err != nil {48 fmt.Println("error:", err)49 }50 defer client.Close()51 reader, err := client.Bucket(bucket).Object(file).NewReader(ctx)52 if err != nil {53 fmt.Println("error:", err)54 }

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Reader

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1import (2func main() {3 ctx := context.Background()4 client, err := storage.NewClient(ctx)5 if err != nil {6 fmt.Println(err)7 }8 bucket := client.Bucket(bucketName)9 object := bucket.Object(objectName)10 r, err := object.NewReader(ctx)11 if err != nil {12 fmt.Println(err)13 }14 if _, err := io.Copy(os.Stdout, r); err != nil {15 fmt.Println(err)16 }17 if err := r.Close(); err != nil {18 fmt.Println(err)19 }20}21import (22func main() {23 ctx := context.Background()24 client, err := storage.NewClient(ctx)25 if err != nil {26 fmt.Println(err)27 }28 bucket := client.Bucket(bucketName)29 object := bucket.Object(objectName)30 r, err := object.NewReader(ctx)31 if err != nil {32 fmt.Println(err)

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1func TestReader(t *testing.T) {2}3func TestWriter(t *testing.T) {4}5func TestReader(t *testing.T) {6}7func TestWriter(t *testing.T) {8}

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1import (2func main() {3 ctx := context.Background()4 client, err := storage.NewClient(ctx)5 if err != nil {6 log.Fatal(err)7 }8 bucket := client.Bucket("my-bucket")9 object := bucket.Object("my-object")10 r, err := object.NewReader(ctx)11 if err != nil {12 log.Fatal(err)13 }14 defer r.Close()15 if _, err := io.Copy(os.Stdout, r); err != nil {16 log.Fatal(err)17 }18}19import (20func main() {21 ctx := context.Background()22 client, err := storage.NewClient(ctx)23 if err != nil {24 log.Fatal(err)25 }26 bucket := client.Bucket("my-bucket")27 object := bucket.Object("my-object")28 r, err := object.NewReader(ctx)29 if err != nil {30 log.Fatal(err)31 }32 defer r.Close()33 data, err := ioutil.ReadAll(r)34 if err != nil {35 log.Fatal(err)36 }37 fmt.Println(string(data))38}39import (40func main() {41 ctx := context.Background()42 client, err := storage.NewClient(ctx)43 if err != nil {44 log.Fatal(err)45 }46 bucket := client.Bucket("my-bucket")

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