/
strategy.go
399 lines (347 loc) · 10.3 KB
/
strategy.go
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package gcs
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"sync"
"syscall"
"time"
"github.com/airbusgeo/geocube/internal/log"
"google.golang.org/api/googleapi"
"cloud.google.com/go/storage"
geocubeStorage "github.com/airbusgeo/geocube/interface/storage"
"github.com/airbusgeo/geocube/internal/utils"
)
type gsStrategy struct {
gsClient *storage.Client
ctx context.Context
}
type Writer interface {
io.Writer
}
var retriableOAuth2Errors = []string{
"cannot assign requested address",
"connection refused",
"connection reset",
"timeout",
"broken pipe",
"client connection force closed",
"502 Bad Gateway",
}
var retriableSuffixErrors = []string{
"http2: client connection lost",
"http2: client connection force closed via ClientConn.Close",
"EOF", // Unexpected EOF is a temporary error
}
func gsError(err error) error {
if err == nil {
return nil
}
if errors.Is(err, storage.ErrObjectNotExist) {
return geocubeStorage.ErrFileNotFound
}
if utils.Temporary(err) {
return err
}
// grpc & oauth2 does not transfer the temporary status of error
// see ./vendor/golang.org/x/oauth2/oauth2/jwt/jwt.go func (js jwtSource) Token()
// see ./vendor/google.golang.org/grpc/internal/transport/http2_client.go func (t *http2Client) getTrAuthData
if strings.Contains(err.Error(), "oauth2: cannot fetch token:") {
for _, e := range retriableOAuth2Errors {
if strings.Contains(err.Error(), e) {
return utils.MakeTemporary(err)
}
}
}
for _, e := range retriableSuffixErrors {
if strings.HasSuffix(err.Error(), e) {
return utils.MakeTemporary(err)
}
}
return err
}
func NewGsStrategy(ctx context.Context) (geocubeStorage.Strategy, error) {
var err error
gsClient, err := storage.NewClient(ctx)
if err != nil {
return nil, fmt.Errorf("failed to create gs Client : %w", gsError(err))
}
return gsStrategy{
gsClient: gsClient,
ctx: ctx,
}, nil
}
func (s gsStrategy) Download(ctx context.Context, uri string, options ...geocubeStorage.Option) ([]byte, error) {
bucket, path, err := s.decodeURI(ctx, uri)
if err != nil {
return nil, fmt.Errorf("failed to decode URI %s : %w", uri, err)
}
return s.downloadObject(ctx, bucket, path, options...)
}
func (s gsStrategy) DownloadToFile(ctx context.Context, source, destination string, options ...geocubeStorage.Option) error {
bucket, path, err := s.decodeURI(ctx, source)
if err != nil {
return fmt.Errorf("failed to decode URI %s : %w", source, err)
}
if _, err := os.Stat(filepath.Dir(destination)); os.IsNotExist(err) {
if err := os.MkdirAll(filepath.Dir(destination), os.ModePerm); err != nil {
return err
}
}
writer, err := os.Create(destination)
if err != nil {
return fmt.Errorf("failed to create destination file")
}
if err = s.downloadObjectTo(ctx, bucket, path, writer, options...); err != nil {
writer.Close()
return fmt.Errorf("failed to download object to destination: %w", err)
}
err = writer.Close()
if err != nil {
return fmt.Errorf("DownloadToFile: failed to close writer: %w", err)
}
return nil
}
func (s gsStrategy) Upload(ctx context.Context, uri string, data []byte, options ...geocubeStorage.Option) error {
bucket, object, err := s.decodeURI(ctx, uri)
if err != nil {
return fmt.Errorf("failed to decode URI %s : %w", uri, err)
}
return s.uploadObject(ctx, bucket, object, data, options...)
}
func (s gsStrategy) UploadFile(ctx context.Context, uri string, data io.ReadCloser, options ...geocubeStorage.Option) error {
bucket, object, err := s.decodeURI(ctx, uri)
if err != nil {
return fmt.Errorf("failed to decode URI %s : %w", uri, err)
}
opts := geocubeStorage.Apply(options...)
writer := s.gsClient.Bucket(bucket).Object(object).NewWriter(ctx)
if opts.StorageClass != "" {
writer.StorageClass = opts.StorageClass
}
_, err = io.Copy(writer, data)
if err != nil {
writer.Close()
return fmt.Errorf("UploadFile: failed to copy: %w", gsError(err))
}
err = writer.Close()
if err != nil {
return fmt.Errorf("UploadFile: failed to close writer: %w", gsError(err))
}
return nil
}
func (s gsStrategy) Delete(ctx context.Context, uri string, options ...geocubeStorage.Option) error {
bucket, object, err := s.decodeURI(ctx, uri)
if err != nil {
return fmt.Errorf("failed to decode URI %s : %w", uri, err)
}
return s.deleteObject(ctx, bucket, object, options...)
}
func (s gsStrategy) Exist(ctx context.Context, uri string) (bool, error) {
bucket, object, err := s.decodeURI(ctx, uri)
if err != nil {
return false, fmt.Errorf("failed to decode URI %s : %w", uri, err)
}
if _, err = s.gsClient.Bucket(bucket).Object(object).Attrs(ctx); err != nil {
switch err {
case storage.ErrBucketNotExist:
return false, fmt.Errorf("bucket not exist: %w", err)
case storage.ErrObjectNotExist:
return false, geocubeStorage.ErrFileNotFound
default:
return false, fmt.Errorf("failed to check if file exist on storage: %w", gsError(err))
}
}
return true, nil
}
func (s gsStrategy) GetAttrs(ctx context.Context, uri string) (geocubeStorage.Attrs, error) {
bucket, path, err := s.decodeURI(ctx, uri)
if err != nil {
return geocubeStorage.Attrs{}, fmt.Errorf("failed to decode URI %s : %w", uri, err)
}
attrs, err := s.gsClient.Bucket(bucket).Object(path).Attrs(ctx)
if err == storage.ErrObjectNotExist {
return geocubeStorage.Attrs{}, geocubeStorage.ErrFileNotFound
} else if err != nil {
return geocubeStorage.Attrs{}, fmt.Errorf("failed to get file attributes from GCS : %w", gsError(err))
}
return geocubeStorage.Attrs{
StorageClass: attrs.StorageClass,
ContentType: attrs.ContentType,
}, nil
}
var (
metrics = make(map[string][]streamAtMetrics)
lock = sync.Mutex{}
)
type streamAtMetrics struct {
Calls int
Volume int
}
func GetMetrics(ctx context.Context) {
lock.Lock()
defer lock.Unlock()
for key, streamAtMetricsList := range metrics {
log.Logger(ctx).Sugar().Debugf("GCS Metrics: %s - %d calls - %d octets", key, len(streamAtMetricsList), streamAtMetricsList[len(streamAtMetricsList)-1].Volume)
}
metrics = map[string][]streamAtMetrics{}
}
func (s gsStrategy) StreamAt(key string, off int64, n int64) (io.ReadCloser, int64, error) {
bucket, object, err := bucketObject(key)
if err != nil {
return nil, 0, err
}
gbucket := s.gsClient.Bucket(bucket)
r, err := gbucket.Object(object).NewRangeReader(s.ctx, off, n)
if err != nil {
var gerr *googleapi.Error
if off > 0 && errors.As(err, &gerr) && gerr.Code == 416 {
return nil, 0, io.EOF
}
if errors.Is(err, storage.ErrObjectNotExist) || errors.Is(err, storage.ErrBucketNotExist) {
return nil, -1, syscall.ENOENT
}
err = addTemporaryCheck(err)
return nil, 0, fmt.Errorf("new reader for gs://%s/%s: %w", bucket, object, err)
}
lock.Lock()
defer lock.Unlock()
if metrics[key] != nil {
metrics[key] = append(metrics[key], streamAtMetrics{
Calls: len(metrics[key]) + 1,
Volume: metrics[key][len(metrics[key])-1].Volume + int(n),
})
} else {
metrics[key] = []streamAtMetrics{{
Calls: 1,
Volume: int(n),
}}
}
return readWrapper{r}, r.Attrs.Size, nil
}
func (s *gsStrategy) decodeURI(_ context.Context, uri string) (string, string, error) {
bucket, path, err := Parse(uri)
if err != nil {
return "", "", fmt.Errorf("failed to parse URI : %s : %w", uri, err)
}
return bucket, path, nil
}
func (s gsStrategy) downloadObject(ctx context.Context, bucket, path string, opts ...geocubeStorage.Option) ([]byte, error) {
buf := &bytes.Buffer{}
err := s.downloadObjectTo(ctx, bucket, path, buf, opts...)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (s gsStrategy) downloadObjectTo(ctx context.Context, bucket, path string, w Writer, opts ...geocubeStorage.Option) error {
op := geocubeStorage.Apply(opts...)
d := op.Delay
var err error
var r *storage.Reader
curOffset := op.Offset
bytesRemaining := op.Length
for try := 0; try < op.MaxTries; try++ {
if try > 0 {
time.Sleep(d)
d *= 2
}
bckt := s.gsClient.Bucket(bucket)
r, err = bckt.Object(path).NewRangeReader(ctx, curOffset, bytesRemaining)
if err != nil {
err = gsError(err)
if utils.Temporary(err) {
continue
} else {
return fmt.Errorf("gs.download.newreader: %w", err)
}
}
var n int64
n, err = io.Copy(w, r)
r.Close()
if err == nil {
return nil
}
err = gsError(err)
if !utils.Temporary(err) {
return fmt.Errorf("gs.download.copy: %w", err)
}
curOffset += n
if bytesRemaining > 0 {
bytesRemaining -= n
}
}
return fmt.Errorf("failed after %d retries: %w", op.MaxTries, err)
}
func (s gsStrategy) uploadObject(ctx context.Context, bucket, object string, data []byte, opts ...geocubeStorage.Option) error {
r := bytes.NewReader(data)
return gsError(s.uploadObjectFrom(ctx, bucket, object, r, opts...))
}
func (s gsStrategy) uploadObjectFrom(ctx context.Context, bucket, object string, r io.ReadSeeker, opts ...geocubeStorage.Option) error {
op := geocubeStorage.Apply(opts...)
d := op.Delay
var err error
var w *storage.Writer
off, _ := r.Seek(0, io.SeekCurrent)
for try := 0; try < op.MaxTries; try++ {
if try > 0 {
time.Sleep(d)
d *= 2
_, err = r.Seek(off, io.SeekStart)
if err != nil {
err = gsError(err)
if utils.Temporary(err) {
continue
} else {
return fmt.Errorf("gs.upload.reset: %w", err)
}
}
}
w = s.gsClient.Bucket(bucket).Object(object).NewWriter(ctx)
if op.StorageClass != "" {
w.StorageClass = op.StorageClass
}
_, err = io.Copy(w, r)
if err != nil {
w.Close()
err = gsError(err)
if utils.Temporary(err) {
continue
} else {
return fmt.Errorf("gs.upload.copy: %w", err)
}
}
err = gsError(w.Close())
if err == nil {
return nil
}
if !utils.Temporary(err) {
return fmt.Errorf("gs.upload.close: %w", err)
}
}
return fmt.Errorf("failed after %d retries: %w", op.MaxTries, err)
}
func (s gsStrategy) deleteObject(ctx context.Context, bucket, object string, opts ...geocubeStorage.Option) error {
op := geocubeStorage.Apply(opts...)
d := op.Delay
var err error
for try := 0; try < op.MaxTries; try++ {
if try > 0 {
time.Sleep(d)
d *= 2
}
err = gsError(s.gsClient.Bucket(bucket).Object(object).Delete(ctx))
if err == nil {
return nil
}
if !utils.Temporary(err) {
return fmt.Errorf("gs.deleteObject[%s/%s]: %w", bucket, object, err)
}
}
return fmt.Errorf("failed after %d retries: %w", op.MaxTries, err)
}