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manifest.go
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manifest.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package s3tar
import (
"archive/tar"
"bytes"
"context"
"encoding/csv"
"fmt"
"github.com/aws/aws-sdk-go-v2/service/s3"
"io"
"log"
"os"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
)
func buildToc(ctx context.Context, objectList []*S3Obj) (*S3Obj, *S3Obj, error) {
headers := processHeaders(ctx, objectList, false)
toc, err := _buildToc(ctx, headers, objectList)
if err != nil {
return nil, nil, err
}
// Build a header with the original data
tocObj := NewS3Obj()
tocObj.Key = aws.String("toc.csv")
tocObj.AddData(toc.Bytes())
tocHeader := buildHeader(tocObj, nil, false)
tocHeader.Bucket = objectList[0].Bucket
tocObj.Bucket = objectList[0].Bucket
return tocObj, &tocHeader, nil
}
func _buildToc(ctx context.Context, headers []*S3Obj, objectList []*S3Obj) (*bytes.Buffer, error) {
var currLocation int64 = 0
data, err := createCSVTOC(currLocation, headers, objectList)
if err != nil {
return nil, err
}
estimate := int64(data.Len())
for {
data, err = createCSVTOC(int64(estimate), headers, objectList)
if err != nil {
return nil, err
}
l := int64(data.Len())
lp := l + findPadding(l)
if lp >= estimate {
break
} else {
estimate = lp
}
}
return data, nil
}
func createCSVTOC(offset int64, headers []*S3Obj, objectList []*S3Obj) (*bytes.Buffer, error) {
headerOffset := paxTarHeaderSize
if tarFormat == tar.FormatGNU {
headerOffset = gnuTarHeaderSize
}
var currLocation int64 = offset + headerOffset
currLocation = currLocation + findPadding(currLocation)
buf := bytes.Buffer{}
toc := [][]string{}
for i := 0; i < len(objectList); i++ {
currLocation += *headers[i].Size
line := []string{}
line = append(line,
*objectList[i].Key,
fmt.Sprintf("%d", currLocation),
fmt.Sprintf("%d", *objectList[i].Size),
*objectList[i].ETag)
toc = append(toc, line)
currLocation += *objectList[i].Size
}
cw := csv.NewWriter(&buf)
if err := cw.WriteAll(toc); err != nil {
return nil, err
}
cw.Flush()
return &buf, nil
}
func buildFirstPart(csvData []byte) *S3Obj {
buf := &bytes.Buffer{}
tw := tar.NewWriter(buf)
hdr := &tar.Header{
Name: "toc.csv",
Mode: 0600,
Size: int64(len(csvData)),
ModTime: time.Now(),
ChangeTime: time.Now(),
AccessTime: time.Now(),
Format: tarFormat,
}
buf.Write(pad)
if err := tw.WriteHeader(hdr); err != nil {
log.Fatal(err)
}
if err := tw.Flush(); err != nil {
// we ignore this error, the tar library will complain that we
// didn't write the whole file. This part is already on Amazon S3
}
buf.Write(csvData)
padding := findPadding(int64(len(csvData)))
if padding == 0 {
padding = blockSize
}
lastBytes := make([]byte, padding)
buf.Write(lastBytes)
endPadding := NewS3Obj()
endPadding.AddData(buf.Bytes())
return endPadding
}
func tryParseHeader(ctx context.Context, svc *s3.Client, opts *S3TarS3Options, start int64) (*tar.Header, int64, error) {
var i int64 = 512
var windowStart int64 = start
var header *tar.Header
var offset int64 = 0
data := make([]byte, blockSize*10)
for ; i < (512 * 10); windowStart, i = windowStart+blockSize, i+blockSize {
Debugf(ctx, "trying to parse header from %d-%d\n", start, start+i)
Debugf(ctx, "downloading from %d-%d\n", windowStart, windowStart+blockSize)
r, err := getObjectRange(ctx, svc, opts.SrcBucket, opts.SrcKey, windowStart, windowStart+blockSize-1)
if err != nil {
panic(err)
}
defer r.Close()
all, _ := io.ReadAll(r)
copy(data[i-blockSize:i], all)
if i == blockSize*2 {
endBlock := make([]byte, blockSize*2)
if bytes.Compare(endBlock, data[0:1024]) == 0 {
return nil, offset, io.EOF
}
}
nr := bytes.NewReader(data[0:i])
tr := tar.NewReader(nr)
h, err := tr.Next()
if err == nil {
header = h
offset = start + i
break
}
}
return header, offset, nil
}
// GenerateToc creates a TOC csv of an existing TAR file (not created by s3tar)
// tar file MUST NOT have compression.
// tar file must be on the local file system to.
func GenerateToc(ctx context.Context, svc *s3.Client, tarFile, outputToc string, opts *S3TarS3Options) error {
if strings.Contains(tarFile, "s3://") {
// remote file on s3
fmt.Printf("file is on s3")
w, err := os.Create(outputToc)
if err != nil {
log.Fatal(err.Error())
}
defer w.Close()
cw := csv.NewWriter(w)
var start int64 = 0
for {
header, offset, err := tryParseHeader(ctx, svc, opts, start)
if err == io.EOF {
Debugf(ctx, "reached EOF")
break
}
if err != nil {
// log something
break
}
offsetStr := fmt.Sprintf("%d", offset)
size := fmt.Sprintf("%d", header.Size)
record := []string{header.Name, offsetStr, size, ""}
if err = cw.Write(record); err != nil {
return err
}
start = offset + header.Size + findPadding(offset+header.Size)
Debugf(ctx, "next start: %d\n", start)
}
cw.Flush()
return nil
} else {
// local file
fmt.Printf("file is local")
r, err := os.Open(tarFile)
if err != nil {
log.Fatal(err.Error())
}
defer r.Close()
w, err := os.Create(outputToc)
if err != nil {
log.Fatal(err.Error())
}
defer w.Close()
cw := csv.NewWriter(w)
tr := tar.NewReader(r)
for {
h, err := tr.Next()
if err != nil && err != io.EOF {
return err
}
if err == io.EOF {
break
}
offset, err := r.Seek(0, io.SeekCurrent)
if err != nil {
return err
}
offsetStr := fmt.Sprintf("%d", offset)
size := fmt.Sprintf("%d", h.Size)
record := []string{h.Name, offsetStr, size, ""}
if err = cw.Write(record); err != nil {
return err
}
}
cw.Flush()
return nil
}
}