forked from kubernetes/kops
/
s3fs.go
289 lines (241 loc) · 6.27 KB
/
s3fs.go
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package vfs
import (
"bytes"
"encoding/hex"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/golang/glog"
"io/ioutil"
"k8s.io/kops/util/pkg/hashing"
"os"
"path"
"strings"
"sync"
)
type S3Path struct {
s3Context *S3Context
bucket string
region string
key string
etag *string
}
var _ Path = &S3Path{}
var _ HasHash = &S3Path{}
func NewS3Path(s3Context *S3Context, bucket string, key string) *S3Path {
bucket = strings.TrimSuffix(bucket, "/")
key = strings.TrimPrefix(key, "/")
return &S3Path{
s3Context: s3Context,
bucket: bucket,
key: key,
}
}
func (p *S3Path) Path() string {
return "s3://" + p.bucket + "/" + p.key
}
func (p *S3Path) Bucket() string {
return p.bucket
}
func (p *S3Path) Key() string {
return p.key
}
func (p *S3Path) String() string {
return p.Path()
}
func (p *S3Path) Remove() error {
client, err := p.client()
if err != nil {
return err
}
request := &s3.DeleteObjectInput{}
request.Bucket = aws.String(p.bucket)
request.Key = aws.String(p.key)
_, err = client.DeleteObject(request)
if err != nil {
// TODO: Check for not-exists, return os.NotExist
return fmt.Errorf("error deleting %s: %v", p, err)
}
return nil
}
func (p *S3Path) Join(relativePath ...string) Path {
args := []string{p.key}
args = append(args, relativePath...)
joined := path.Join(args...)
return &S3Path{
s3Context: p.s3Context,
bucket: p.bucket,
key: joined,
}
}
func (p *S3Path) WriteFile(data []byte) error {
client, err := p.client()
if err != nil {
return err
}
glog.V(4).Infof("Writing file %q", p)
request := &s3.PutObjectInput{}
request.Body = bytes.NewReader(data)
request.Bucket = aws.String(p.bucket)
request.Key = aws.String(p.key)
request.ServerSideEncryption = aws.String("AES256")
// We don't need Content-MD5: https://github.com/aws/aws-sdk-go/issues/208
_, err = client.PutObject(request)
if err != nil {
return fmt.Errorf("error writing %s: %v", p, err)
}
return nil
}
// To prevent concurrent creates on the same file while maintaining atomicity of writes,
// we take a process-wide lock during the operation.
// Not a great approach, but fine for a single process (with low concurrency)
// TODO: should we enable versioning?
var createFileLockS3 sync.Mutex
func (p *S3Path) CreateFile(data []byte) error {
createFileLockS3.Lock()
defer createFileLockS3.Unlock()
// Check if exists
_, err := p.ReadFile()
if err == nil {
return os.ErrExist
}
if !os.IsNotExist(err) {
return err
}
return p.WriteFile(data)
}
func (p *S3Path) ReadFile() ([]byte, error) {
client, err := p.client()
if err != nil {
return nil, err
}
glog.V(4).Infof("Reading file %q", p)
request := &s3.GetObjectInput{}
request.Bucket = aws.String(p.bucket)
request.Key = aws.String(p.key)
response, err := client.GetObject(request)
if err != nil {
if AWSErrorCode(err) == "NoSuchKey" {
return nil, os.ErrNotExist
}
return nil, fmt.Errorf("error fetching %s: %v", p, err)
}
defer response.Body.Close()
d, err := ioutil.ReadAll(response.Body)
if err != nil {
return nil, fmt.Errorf("error reading %s: %v", p, err)
}
return d, nil
}
func (p *S3Path) ReadDir() ([]Path, error) {
client, err := p.client()
if err != nil {
return nil, err
}
prefix := p.key
if !strings.HasSuffix(prefix, "/") {
prefix += "/"
}
request := &s3.ListObjectsInput{}
request.Bucket = aws.String(p.bucket)
request.Prefix = aws.String(prefix)
request.Delimiter = aws.String("/")
glog.V(4).Infof("Listing objects in S3 bucket %q with prefix %q", p.bucket, prefix)
var paths []Path
err = client.ListObjectsPages(request, func(page *s3.ListObjectsOutput, lastPage bool) bool {
for _, o := range page.Contents {
key := aws.StringValue(o.Key)
if key == prefix {
// We have reports (#548 and #520) of the directory being returned as a file
// And this will indeed happen if the directory has been created as a file,
// which seems to happen if you use some external tools to manipulate the S3 bucket.
// We need to tolerate that, so skip the parent directory.
glog.V(4).Infof("Skipping read of directory: %q", key)
continue
}
child := &S3Path{
s3Context: p.s3Context,
bucket: p.bucket,
key: key,
etag: o.ETag,
}
paths = append(paths, child)
}
return true
})
if err != nil {
return nil, fmt.Errorf("error listing %s: %v", p, err)
}
glog.V(8).Infof("Listed files in %v: %v", p, paths)
return paths, nil
}
func (p *S3Path) ReadTree() ([]Path, error) {
client, err := p.client()
if err != nil {
return nil, err
}
request := &s3.ListObjectsInput{}
request.Bucket = aws.String(p.bucket)
request.Prefix = aws.String(p.key)
// No delimiter for recursive search
var paths []Path
err = client.ListObjectsPages(request, func(page *s3.ListObjectsOutput, lastPage bool) bool {
for _, o := range page.Contents {
key := aws.StringValue(o.Key)
child := &S3Path{
s3Context: p.s3Context,
bucket: p.bucket,
key: key,
etag: o.ETag,
}
paths = append(paths, child)
}
return true
})
if err != nil {
return nil, fmt.Errorf("error listing %s: %v", p, err)
}
return paths, nil
}
func (p *S3Path) client() (*s3.S3, error) {
var err error
if p.region == "" {
p.region, err = p.s3Context.getRegionForBucket(p.bucket)
if err != nil {
return nil, err
}
}
client, err := p.s3Context.getClient(p.region)
if err != nil {
return nil, err
}
return client, nil
}
func (p *S3Path) Base() string {
return path.Base(p.key)
}
func (p *S3Path) PreferredHash() (*hashing.Hash, error) {
return p.Hash(hashing.HashAlgorithmMD5)
}
func (p *S3Path) Hash(a hashing.HashAlgorithm) (*hashing.Hash, error) {
if a != hashing.HashAlgorithmMD5 {
return nil, nil
}
if p.etag == nil {
return nil, nil
}
md5 := strings.Trim(*p.etag, "\"")
md5Bytes, err := hex.DecodeString(md5)
if err != nil {
return nil, fmt.Errorf("Etag was not a valid MD5 sum: %q", *p.etag)
}
return &hashing.Hash{Algorithm: hashing.HashAlgorithmMD5, HashValue: md5Bytes}, nil
}
// AWSErrorCode returns the aws error code, if it is an awserr.Error, otherwise ""
func AWSErrorCode(err error) string {
if awsError, ok := err.(awserr.Error); ok {
return awsError.Code()
}
return ""
}