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gcs.go
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gcs.go
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package gcs
import (
"bytes"
"context"
"crypto/tls"
"io"
"net/http"
"path"
"strings"
"time"
"github.com/grafana/tempo/tempodb/backend/instrumentation"
"cloud.google.com/go/storage"
"github.com/cristalhq/hedgedhttp"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
google_http "google.golang.org/api/transport/http"
tempo_io "github.com/grafana/tempo/pkg/io"
"github.com/grafana/tempo/tempodb/backend"
)
type readerWriter struct {
cfg *Config
bucket *storage.BucketHandle
hedgedBucket *storage.BucketHandle
}
// NewNoConfirm gets the GCS backend without testing it
func NewNoConfirm(cfg *Config) (backend.RawReader, backend.RawWriter, backend.Compactor, error) {
return internalNew(cfg, false)
}
// New gets the GCS backend
func New(cfg *Config) (backend.RawReader, backend.RawWriter, backend.Compactor, error) {
return internalNew(cfg, true)
}
func internalNew(cfg *Config, confirm bool) (backend.RawReader, backend.RawWriter, backend.Compactor, error) {
ctx := context.Background()
bucket, err := createBucket(ctx, cfg, false)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "creating bucket")
}
hedgedBucket, err := createBucket(ctx, cfg, true)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "creating hedged bucket")
}
// Check bucket exists by getting attrs
if confirm {
if _, err = bucket.Attrs(ctx); err != nil {
return nil, nil, nil, errors.Wrap(err, "getting bucket attrs")
}
}
rw := &readerWriter{
cfg: cfg,
bucket: bucket,
hedgedBucket: hedgedBucket,
}
return rw, rw, rw, nil
}
// Write implements backend.Writer
func (rw *readerWriter) Write(ctx context.Context, name string, keypath backend.KeyPath, data io.Reader, _ int64, _ bool) error {
w := rw.writer(ctx, backend.ObjectFileName(keypath, name))
_, err := io.Copy(w, data)
if err != nil {
w.Close()
return errors.Wrap(err, "failed to write")
}
return w.Close()
}
// Append implements backend.Writer
func (rw *readerWriter) Append(ctx context.Context, name string, keypath backend.KeyPath, tracker backend.AppendTracker, buffer []byte) (backend.AppendTracker, error) {
span, ctx := opentracing.StartSpanFromContext(ctx, "gcs.Append", opentracing.Tags{
"len": len(buffer),
})
defer span.Finish()
var w *storage.Writer
if tracker == nil {
w = rw.writer(ctx, backend.ObjectFileName(keypath, name))
} else {
w = tracker.(*storage.Writer)
}
_, err := w.Write(buffer)
if err != nil {
return nil, err
}
return w, nil
}
// CloseAppend implements backend.Writer
func (rw *readerWriter) CloseAppend(_ context.Context, tracker backend.AppendTracker) error {
if tracker == nil {
return nil
}
w := tracker.(*storage.Writer)
return w.Close()
}
// List implements backend.Reader
func (rw *readerWriter) List(ctx context.Context, keypath backend.KeyPath) ([]string, error) {
prefix := path.Join(keypath...)
if len(prefix) > 0 {
prefix = prefix + "/"
}
iter := rw.bucket.Objects(ctx, &storage.Query{
Prefix: prefix,
Delimiter: "/",
Versions: false,
})
var objects []string
for {
attrs, err := iter.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, errors.Wrap(err, "iterating blocks")
}
obj := strings.TrimSuffix(strings.TrimPrefix(attrs.Prefix, prefix), "/")
objects = append(objects, obj)
}
return objects, nil
}
// Read implements backend.Reader
func (rw *readerWriter) Read(ctx context.Context, name string, keypath backend.KeyPath, _ bool) (io.ReadCloser, int64, error) {
span, derivedCtx := opentracing.StartSpanFromContext(ctx, "gcs.Read")
defer span.Finish()
span.SetTag("object", name)
b, err := rw.readAll(derivedCtx, backend.ObjectFileName(keypath, name))
if err != nil {
span.SetTag("error", true)
}
return io.NopCloser(bytes.NewReader(b)), int64(len(b)), readError(err)
}
// ReadRange implements backend.Reader
func (rw *readerWriter) ReadRange(ctx context.Context, name string, keypath backend.KeyPath, offset uint64, buffer []byte, _ bool) error {
span, derivedCtx := opentracing.StartSpanFromContext(ctx, "gcs.ReadRange", opentracing.Tags{
"len": len(buffer),
"offset": offset,
})
defer span.Finish()
err := rw.readRange(derivedCtx, backend.ObjectFileName(keypath, name), int64(offset), buffer)
if err != nil {
span.SetTag("error", true)
}
return readError(err)
}
// Shutdown implements backend.Reader
func (rw *readerWriter) Shutdown() {
}
func (rw *readerWriter) writer(ctx context.Context, name string) *storage.Writer {
o := rw.bucket.Object(name)
w := o.NewWriter(ctx)
w.ChunkSize = rw.cfg.ChunkBufferSize
if rw.cfg.ObjectMetadata != nil {
w.Metadata = rw.cfg.ObjectMetadata
}
if rw.cfg.ObjectCacheControl != "" {
w.CacheControl = rw.cfg.ObjectCacheControl
}
return w
}
func (rw *readerWriter) readAll(ctx context.Context, name string) ([]byte, error) {
r, err := rw.hedgedBucket.Object(name).NewReader(ctx)
if err != nil {
return nil, err
}
defer r.Close()
return tempo_io.ReadAllWithEstimate(r, r.Attrs.Size)
}
func (rw *readerWriter) readAllWithModTime(ctx context.Context, name string) ([]byte, time.Time, error) {
r, err := rw.hedgedBucket.Object(name).NewReader(ctx)
if err != nil {
return nil, time.Time{}, err
}
defer r.Close()
buf, err := tempo_io.ReadAllWithEstimate(r, r.Attrs.Size)
if err != nil {
return nil, time.Time{}, err
}
return buf, r.Attrs.LastModified, nil
}
func (rw *readerWriter) readRange(ctx context.Context, name string, offset int64, buffer []byte) error {
r, err := rw.hedgedBucket.Object(name).NewRangeReader(ctx, offset, int64(len(buffer)))
if err != nil {
return err
}
defer r.Close()
totalBytes := 0
for {
byteCount, err := r.Read(buffer[totalBytes:])
if err == io.EOF {
return nil
}
if err != nil {
return err
}
if byteCount == 0 {
return nil
}
totalBytes += byteCount
}
}
func createBucket(ctx context.Context, cfg *Config, hedge bool) (*storage.BucketHandle, error) {
// start with default transport
customTransport := http.DefaultTransport.(*http.Transport).Clone()
// add google auth
transportOptions := []option.ClientOption{
option.WithScopes(storage.ScopeReadWrite),
}
if cfg.Insecure {
transportOptions = append(transportOptions, option.WithoutAuthentication())
customTransport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
}
transport, err := google_http.NewTransport(ctx, customTransport, transportOptions...)
if err != nil {
return nil, errors.Wrap(err, "creating google http transport")
}
// add instrumentation
transport = instrumentation.NewTransport(transport)
var stats *hedgedhttp.Stats
// hedge if desired (0 means disabled)
if hedge && cfg.HedgeRequestsAt != 0 {
transport, stats, err = hedgedhttp.NewRoundTripperAndStats(cfg.HedgeRequestsAt, cfg.HedgeRequestsUpTo, transport)
if err != nil {
return nil, err
}
instrumentation.PublishHedgedMetrics(stats)
}
// build client
storageClientOptions := []option.ClientOption{
option.WithHTTPClient(&http.Client{
Transport: transport,
}),
option.WithScopes(storage.ScopeReadWrite),
}
if cfg.Endpoint != "" {
storageClientOptions = append(storageClientOptions, option.WithEndpoint(cfg.Endpoint))
}
client, err := storage.NewClient(ctx, storageClientOptions...)
if err != nil {
return nil, errors.Wrap(err, "creating storage client")
}
// build bucket
return client.Bucket(cfg.BucketName), nil
}
func readError(err error) error {
if err == storage.ErrObjectNotExist {
return backend.ErrDoesNotExist
}
return err
}