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reader.go
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/
reader.go
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package s3inventory
import (
"context"
"errors"
"fmt"
"time"
"github.com/aws/aws-sdk-go/service/s3/s3iface"
"github.com/scritchley/orc"
"github.com/treeverse/lakefs/pkg/logging"
s3parquet "github.com/xitongsys/parquet-go-source/s3"
"github.com/xitongsys/parquet-go/reader"
)
const (
bucketFieldName = "bucket"
keyFieldName = "key"
sizeFieldName = "size"
lastModifiedDateFieldName = "last_modified_date"
eTagFieldName = "e_tag"
isDeleteMarkerFieldName = "is_delete_marker"
isLatestFieldName = "is_latest"
)
var inventoryFields = []string{
bucketFieldName,
keyFieldName,
sizeFieldName,
lastModifiedDateFieldName,
eTagFieldName,
isDeleteMarkerFieldName,
isLatestFieldName,
}
var requiredFields = []string{bucketFieldName, keyFieldName}
const (
OrcFormatName = "ORC"
ParquetFormatName = "Parquet"
)
var (
ErrUnsupportedInventoryFormat = errors.New("unsupported inventory type. supported types: parquet, orc")
ErrRequiredFieldNotFound = errors.New("required field not found in inventory")
ErrUnknownField = errors.New("unknown field")
)
type IReader interface {
GetFileReader(format string, bucket string, key string) (FileReader, error)
GetMetadataReader(format string, bucket string, key string) (MetadataReader, error)
}
type InventoryObject struct {
Bucket string
Key string
IsLatest bool
IsDeleteMarker bool
Size int64
LastModified *time.Time
Checksum string
}
func NewInventoryObject() *InventoryObject {
return &InventoryObject{IsLatest: true}
}
func (o *InventoryObject) GetPhysicalAddress() string {
return "s3://" + o.Bucket + "/" + o.Key
}
type Reader struct {
ctx context.Context
svc s3iface.S3API
logger logging.Logger
}
type MetadataReader interface {
GetNumRows() int64
Close() error
FirstObjectKey() string
LastObjectKey() string
}
type FileReader interface {
MetadataReader
Read(n int) ([]*InventoryObject, error)
}
func NewReader(ctx context.Context, svc s3iface.S3API, logger logging.Logger) IReader {
return &Reader{ctx: ctx, svc: svc, logger: logger}
}
func (o *Reader) GetFileReader(format string, bucket string, key string) (FileReader, error) {
switch format {
case OrcFormatName:
return o.getOrcReader(bucket, key, false)
case ParquetFormatName:
return o.getParquetReader(bucket, key)
default:
return nil, ErrUnsupportedInventoryFormat
}
}
func (o *Reader) GetMetadataReader(format string, bucket string, key string) (MetadataReader, error) {
switch format {
case OrcFormatName:
return o.getOrcReader(bucket, key, true)
default:
return o.GetFileReader(format, bucket, key)
}
}
func (o *Reader) getParquetReader(bucket string, key string) (FileReader, error) {
pf, err := s3parquet.NewS3FileReaderWithClient(o.ctx, o.svc, bucket, key)
if err != nil {
return nil, fmt.Errorf("failed to create parquet file reader: %w", err)
}
pr, err := reader.NewParquetReader(pf, nil, 4) //nolint: gomnd
if err != nil {
return nil, fmt.Errorf("failed to create parquet reader: %w", err)
}
return NewParquetInventoryFileReader(pr)
}
func (o *Reader) getOrcReader(bucket string, key string, tailOnly bool) (FileReader, error) {
orcFile, err := DownloadOrc(o.ctx, o.svc, o.logger, bucket, key, tailOnly)
if err != nil {
return nil, err
}
orcReader, err := orc.NewReader(orcFile)
if err != nil {
return nil, err
}
orcSelect := getOrcSelect(orcReader.Schema())
return &OrcInventoryFileReader{
ctx: o.ctx,
reader: orcReader,
orcFile: orcFile,
orcSelect: orcSelect,
cursor: orcReader.Select(orcSelect.SelectFields...),
}, nil
}
func isRequired(field string) bool {
for _, f := range requiredFields {
if f == field {
return true
}
}
return false
}