mirror of
https://github.com/seaweedfs/seaweedfs.git
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516 lines
16 KiB
Go
516 lines
16 KiB
Go
package s3api
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import (
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"context"
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"encoding/xml"
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
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"io"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"time"
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"github.com/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
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)
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type ListBucketResultV2 struct {
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XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ListBucketResult"`
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Name string `xml:"Name"`
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Prefix string `xml:"Prefix"`
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MaxKeys int `xml:"MaxKeys"`
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Delimiter string `xml:"Delimiter,omitempty"`
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IsTruncated bool `xml:"IsTruncated"`
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Contents []ListEntry `xml:"Contents,omitempty"`
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CommonPrefixes []PrefixEntry `xml:"CommonPrefixes,omitempty"`
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ContinuationToken string `xml:"ContinuationToken,omitempty"`
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NextContinuationToken string `xml:"NextContinuationToken,omitempty"`
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KeyCount int `xml:"KeyCount"`
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StartAfter string `xml:"StartAfter,omitempty"`
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}
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func (s3a *S3ApiServer) ListObjectsV2Handler(w http.ResponseWriter, r *http.Request) {
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// https://docs.aws.amazon.com/AmazonS3/latest/API/v2-RESTBucketGET.html
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// collect parameters
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bucket, _ := s3_constants.GetBucketAndObject(r)
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glog.V(3).Infof("ListObjectsV2Handler %s", bucket)
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originalPrefix, continuationToken, startAfter, delimiter, _, maxKeys := getListObjectsV2Args(r.URL.Query())
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if maxKeys < 0 {
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s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxKeys)
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return
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}
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marker := continuationToken
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if continuationToken == "" {
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marker = startAfter
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}
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response, err := s3a.listFilerEntries(bucket, originalPrefix, maxKeys, marker, delimiter)
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if err != nil {
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s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
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return
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}
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if len(response.Contents) == 0 {
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if exists, existErr := s3a.exists(s3a.option.BucketsPath, bucket, true); existErr == nil && !exists {
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s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchBucket)
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return
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}
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}
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responseV2 := &ListBucketResultV2{
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XMLName: response.XMLName,
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Name: response.Name,
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CommonPrefixes: response.CommonPrefixes,
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Contents: response.Contents,
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ContinuationToken: continuationToken,
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Delimiter: response.Delimiter,
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IsTruncated: response.IsTruncated,
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KeyCount: len(response.Contents) + len(response.CommonPrefixes),
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MaxKeys: response.MaxKeys,
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NextContinuationToken: response.NextMarker,
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Prefix: response.Prefix,
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StartAfter: startAfter,
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}
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writeSuccessResponseXML(w, r, responseV2)
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}
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func (s3a *S3ApiServer) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
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// https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
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// collect parameters
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bucket, _ := s3_constants.GetBucketAndObject(r)
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glog.V(3).Infof("ListObjectsV1Handler %s", bucket)
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originalPrefix, marker, delimiter, maxKeys := getListObjectsV1Args(r.URL.Query())
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if maxKeys < 0 {
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s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxKeys)
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return
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}
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response, err := s3a.listFilerEntries(bucket, originalPrefix, maxKeys, marker, delimiter)
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if err != nil {
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s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
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return
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}
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if len(response.Contents) == 0 {
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if exists, existErr := s3a.exists(s3a.option.BucketsPath, bucket, true); existErr == nil && !exists {
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s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchBucket)
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return
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}
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}
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writeSuccessResponseXML(w, r, response)
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}
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func (s3a *S3ApiServer) listFilerEntries(bucket string, originalPrefix string, maxKeys int, originalMarker string, delimiter string) (response ListBucketResult, err error) {
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// convert full path prefix into directory name and prefix for entry name
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requestDir, prefix, marker := normalizePrefixMarker(originalPrefix, originalMarker)
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bucketPrefix := fmt.Sprintf("%s/%s/", s3a.option.BucketsPath, bucket)
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reqDir := bucketPrefix[:len(bucketPrefix)-1]
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if requestDir != "" {
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reqDir = fmt.Sprintf("%s%s", bucketPrefix, requestDir)
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}
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var contents []ListEntry
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var commonPrefixes []PrefixEntry
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var doErr error
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var nextMarker string
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cursor := &ListingCursor{
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maxKeys: maxKeys,
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prefixEndsOnDelimiter: strings.HasSuffix(originalPrefix, "/") && len(originalMarker) == 0,
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}
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// check filer
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err = s3a.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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for {
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empty := true
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nextMarker, doErr = s3a.doListFilerEntries(client, reqDir, prefix, cursor, marker, delimiter, false, func(dir string, entry *filer_pb.Entry) {
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empty = false
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if entry.IsDirectory {
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if entry.IsDirectoryKeyObject() {
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contents = append(contents, ListEntry{
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Key: fmt.Sprintf("%s/%s/", dir, entry.Name)[len(bucketPrefix):],
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LastModified: time.Unix(entry.Attributes.Mtime, 0).UTC(),
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ETag: "\"" + filer.ETag(entry) + "\"",
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Owner: CanonicalUser{
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ID: fmt.Sprintf("%x", entry.Attributes.Uid),
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DisplayName: entry.Attributes.UserName,
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},
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StorageClass: "STANDARD",
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})
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cursor.maxKeys--
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// https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectsV2.html
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} else if delimiter == "/" { // A response can contain CommonPrefixes only if you specify a delimiter.
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commonPrefixes = append(commonPrefixes, PrefixEntry{
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Prefix: fmt.Sprintf("%s/%s/", dir, entry.Name)[len(bucketPrefix):],
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})
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//All of the keys (up to 1,000) rolled up into a common prefix count as a single return when calculating the number of returns.
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cursor.maxKeys--
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}
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} else {
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var delimiterFound bool
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if delimiter != "" {
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// keys that contain the same string between the prefix and the first occurrence of the delimiter are grouped together as a commonPrefix.
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// extract the string between the prefix and the delimiter and add it to the commonPrefixes if it's unique.
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undelimitedPath := fmt.Sprintf("%s/%s", dir, entry.Name)[len(bucketPrefix):]
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// take into account a prefix if supplied while delimiting.
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undelimitedPath = strings.TrimPrefix(undelimitedPath, originalPrefix)
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delimitedPath := strings.SplitN(undelimitedPath, delimiter, 2)
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if len(delimitedPath) == 2 {
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// S3 clients expect the delimited prefix to contain the delimiter and prefix.
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delimitedPrefix := originalPrefix + delimitedPath[0] + delimiter
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for i := range commonPrefixes {
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if commonPrefixes[i].Prefix == delimitedPrefix {
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delimiterFound = true
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break
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}
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}
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if !delimiterFound {
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commonPrefixes = append(commonPrefixes, PrefixEntry{
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Prefix: delimitedPrefix,
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})
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cursor.maxKeys--
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delimiterFound = true
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}
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}
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}
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if !delimiterFound {
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storageClass := "STANDARD"
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if v, ok := entry.Extended[s3_constants.AmzStorageClass]; ok {
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storageClass = string(v)
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}
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contents = append(contents, ListEntry{
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Key: fmt.Sprintf("%s/%s", dir, entry.Name)[len(bucketPrefix):],
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LastModified: time.Unix(entry.Attributes.Mtime, 0).UTC(),
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ETag: "\"" + filer.ETag(entry) + "\"",
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Size: int64(filer.FileSize(entry)),
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Owner: CanonicalUser{
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ID: fmt.Sprintf("%x", entry.Attributes.Uid),
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DisplayName: entry.Attributes.UserName,
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},
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StorageClass: StorageClass(storageClass),
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})
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cursor.maxKeys--
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}
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}
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})
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if doErr != nil {
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return doErr
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}
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if cursor.isTruncated {
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if requestDir != "" {
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nextMarker = requestDir + "/" + nextMarker
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}
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break
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} else if empty || strings.HasSuffix(originalPrefix, "/") {
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nextMarker = ""
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break
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} else {
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// start next loop
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marker = nextMarker
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}
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}
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response = ListBucketResult{
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Name: bucket,
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Prefix: originalPrefix,
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Marker: originalMarker,
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NextMarker: nextMarker,
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MaxKeys: maxKeys,
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Delimiter: delimiter,
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IsTruncated: cursor.isTruncated,
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Contents: contents,
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CommonPrefixes: commonPrefixes,
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}
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return nil
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})
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return
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}
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type ListingCursor struct {
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maxKeys int
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isTruncated bool
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prefixEndsOnDelimiter bool
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}
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// the prefix and marker may be in different directories
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// normalizePrefixMarker ensures the prefix and marker both starts from the same directory
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func normalizePrefixMarker(prefix, marker string) (alignedDir, alignedPrefix, alignedMarker string) {
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// alignedDir should not end with "/"
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// alignedDir, alignedPrefix, alignedMarker should only have "/" in middle
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if len(marker) == 0 {
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prefix = strings.Trim(prefix, "/")
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} else {
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prefix = strings.TrimLeft(prefix, "/")
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}
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marker = strings.TrimLeft(marker, "/")
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if prefix == "" {
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return "", "", marker
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}
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if marker == "" {
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alignedDir, alignedPrefix = toDirAndName(prefix)
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return
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}
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if !strings.HasPrefix(marker, prefix) {
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// something wrong
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return "", prefix, marker
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}
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if strings.HasPrefix(marker, prefix+"/") {
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alignedDir = prefix
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alignedPrefix = ""
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alignedMarker = marker[len(alignedDir)+1:]
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return
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}
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alignedDir, alignedPrefix = toDirAndName(prefix)
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if alignedDir != "" {
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alignedMarker = marker[len(alignedDir)+1:]
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} else {
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alignedMarker = marker
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}
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return
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}
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func toDirAndName(dirAndName string) (dir, name string) {
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sepIndex := strings.LastIndex(dirAndName, "/")
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if sepIndex >= 0 {
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dir, name = dirAndName[0:sepIndex], dirAndName[sepIndex+1:]
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} else {
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name = dirAndName
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}
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return
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}
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func toParentAndDescendants(dirAndName string) (dir, name string) {
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sepIndex := strings.Index(dirAndName, "/")
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if sepIndex >= 0 {
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dir, name = dirAndName[0:sepIndex], dirAndName[sepIndex+1:]
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} else {
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name = dirAndName
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}
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return
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}
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func (s3a *S3ApiServer) doListFilerEntries(client filer_pb.SeaweedFilerClient, dir, prefix string, cursor *ListingCursor, marker, delimiter string, inclusiveStartFrom bool, eachEntryFn func(dir string, entry *filer_pb.Entry)) (nextMarker string, err error) {
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// invariants
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// prefix and marker should be under dir, marker may contain "/"
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// maxKeys should be updated for each recursion
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// glog.V(4).Infof("doListFilerEntries dir: %s, prefix: %s, marker %s, maxKeys: %d, prefixEndsOnDelimiter: %+v", dir, prefix, marker, cursor.maxKeys, cursor.prefixEndsOnDelimiter)
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if prefix == "/" && delimiter == "/" {
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return
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}
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if cursor.maxKeys <= 0 {
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return
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}
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if strings.Contains(marker, "/") {
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subDir, subMarker := toParentAndDescendants(marker)
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// println("doListFilerEntries dir", dir+"/"+subDir, "subMarker", subMarker)
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subNextMarker, subErr := s3a.doListFilerEntries(client, dir+"/"+subDir, "", cursor, subMarker, delimiter, false, eachEntryFn)
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if subErr != nil {
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err = subErr
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return
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}
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nextMarker = subDir + "/" + subNextMarker
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// finished processing this subdirectory
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marker = subDir
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}
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if cursor.isTruncated {
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return
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}
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// now marker is also a direct child of dir
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request := &filer_pb.ListEntriesRequest{
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Directory: dir,
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Prefix: prefix,
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Limit: uint32(cursor.maxKeys + 2), // bucket root directory needs to skip additional s3_constants.MultipartUploadsFolder folder
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StartFromFileName: marker,
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InclusiveStartFrom: inclusiveStartFrom,
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}
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if cursor.prefixEndsOnDelimiter {
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request.Limit = uint32(1)
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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stream, listErr := client.ListEntries(ctx, request)
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if listErr != nil {
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err = fmt.Errorf("list entires %+v: %v", request, listErr)
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return
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}
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for {
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resp, recvErr := stream.Recv()
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if recvErr != nil {
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if recvErr == io.EOF {
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break
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} else {
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err = fmt.Errorf("iterating entires %+v: %v", request, recvErr)
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return
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}
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}
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if cursor.maxKeys <= 0 {
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cursor.isTruncated = true
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continue
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}
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entry := resp.Entry
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nextMarker = entry.Name
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if cursor.prefixEndsOnDelimiter {
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if entry.Name == prefix && entry.IsDirectory {
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if delimiter != "/" {
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cursor.prefixEndsOnDelimiter = false
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}
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} else {
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continue
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}
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}
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if entry.IsDirectory {
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// glog.V(4).Infof("List Dir Entries %s, file: %s, maxKeys %d", dir, entry.Name, cursor.maxKeys)
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if entry.Name == s3_constants.MultipartUploadsFolder { // FIXME no need to apply to all directories. this extra also affects maxKeys
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continue
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}
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if delimiter != "/" || cursor.prefixEndsOnDelimiter {
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if cursor.prefixEndsOnDelimiter {
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cursor.prefixEndsOnDelimiter = false
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if entry.IsDirectoryKeyObject() {
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eachEntryFn(dir, entry)
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}
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} else {
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eachEntryFn(dir, entry)
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}
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subNextMarker, subErr := s3a.doListFilerEntries(client, dir+"/"+entry.Name, "", cursor, "", delimiter, false, eachEntryFn)
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if subErr != nil {
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err = fmt.Errorf("doListFilerEntries2: %v", subErr)
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return
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}
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// println("doListFilerEntries2 dir", dir+"/"+entry.Name, "subNextMarker", subNextMarker)
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nextMarker = entry.Name + "/" + subNextMarker
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if cursor.isTruncated {
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return
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}
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// println("doListFilerEntries2 nextMarker", nextMarker)
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} else {
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var isEmpty bool
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if !s3a.option.AllowEmptyFolder && entry.IsOlderDir() {
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if isEmpty, err = s3a.ensureDirectoryAllEmpty(client, dir, entry.Name); err != nil {
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glog.Errorf("check empty folder %s: %v", dir, err)
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}
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}
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if !isEmpty {
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eachEntryFn(dir, entry)
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}
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}
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} else {
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eachEntryFn(dir, entry)
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// glog.V(4).Infof("List File Entries %s, file: %s, maxKeys %d", dir, entry.Name, cursor.maxKeys)
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}
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if cursor.prefixEndsOnDelimiter {
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cursor.prefixEndsOnDelimiter = false
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}
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}
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return
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}
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func getListObjectsV2Args(values url.Values) (prefix, token, startAfter, delimiter string, fetchOwner bool, maxkeys int) {
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prefix = values.Get("prefix")
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token = values.Get("continuation-token")
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startAfter = values.Get("start-after")
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delimiter = values.Get("delimiter")
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if values.Get("max-keys") != "" {
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maxkeys, _ = strconv.Atoi(values.Get("max-keys"))
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} else {
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maxkeys = maxObjectListSizeLimit
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}
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fetchOwner = values.Get("fetch-owner") == "true"
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return
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}
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func getListObjectsV1Args(values url.Values) (prefix, marker, delimiter string, maxkeys int) {
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prefix = values.Get("prefix")
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marker = values.Get("marker")
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delimiter = values.Get("delimiter")
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if values.Get("max-keys") != "" {
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maxkeys, _ = strconv.Atoi(values.Get("max-keys"))
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} else {
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maxkeys = maxObjectListSizeLimit
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}
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return
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}
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func (s3a *S3ApiServer) ensureDirectoryAllEmpty(filerClient filer_pb.SeaweedFilerClient, parentDir, name string) (isEmpty bool, err error) {
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// println("+ ensureDirectoryAllEmpty", dir, name)
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glog.V(4).Infof("+ isEmpty %s/%s", parentDir, name)
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defer glog.V(4).Infof("- isEmpty %s/%s %v", parentDir, name, isEmpty)
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var fileCounter int
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var subDirs []string
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currentDir := parentDir + "/" + name
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var startFrom string
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var isExhausted bool
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var foundEntry bool
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for fileCounter == 0 && !isExhausted && err == nil {
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err = filer_pb.SeaweedList(filerClient, currentDir, "", func(entry *filer_pb.Entry, isLast bool) error {
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foundEntry = true
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if entry.IsOlderDir() {
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subDirs = append(subDirs, entry.Name)
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} else {
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fileCounter++
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}
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startFrom = entry.Name
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isExhausted = isExhausted || isLast
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glog.V(4).Infof(" * %s/%s isLast: %t", currentDir, startFrom, isLast)
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return nil
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}, startFrom, false, 8)
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if !foundEntry {
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break
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}
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}
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if err != nil {
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return false, err
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}
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if fileCounter > 0 {
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return false, nil
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}
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for _, subDir := range subDirs {
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isSubEmpty, subErr := s3a.ensureDirectoryAllEmpty(filerClient, currentDir, subDir)
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if subErr != nil {
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return false, subErr
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}
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|
if !isSubEmpty {
|
|
return false, nil
|
|
}
|
|
}
|
|
|
|
glog.V(1).Infof("deleting empty folder %s", currentDir)
|
|
if err = doDeleteEntry(filerClient, parentDir, name, true, false); err != nil {
|
|
return
|
|
}
|
|
|
|
return true, nil
|
|
}
|