mirror of https://github.com/perkeep/perkeep.git
85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
/*
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Copyright 2011 The Perkeep Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package s3
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import (
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"context"
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"fmt"
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"log"
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"path"
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"perkeep.org/pkg/blob"
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"perkeep.org/pkg/blobserver"
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)
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var _ blobserver.MaxEnumerateConfig = (*s3Storage)(nil)
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func (sto *s3Storage) MaxEnumerate() int { return 1000 }
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// marker returns the string lexically greater than the provided s
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// with the same length as s.
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func nextStr(s string) string {
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if s == "" {
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return s
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}
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b := []byte(s)
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i := len(b)
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for i > 0 {
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i--
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b[i]++
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if b[i] != 0 {
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break
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}
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}
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return string(b)
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}
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func (sto *s3Storage) EnumerateBlobs(ctx context.Context, dest chan<- blob.SizedRef, after string, limit int) (err error) {
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defer close(dest)
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if faultEnumerate.FailErr(&err) {
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return
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}
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startAt := after
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if _, ok := blob.Parse(after); ok {
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startAt = nextStr(after)
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}
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objs, err := sto.s3Client.ListBucket(ctx, sto.bucket, sto.dirPrefix+startAt, limit)
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if err != nil {
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log.Printf("s3 ListBucket: %v", err)
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return err
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}
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for _, obj := range objs {
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dir, file := path.Split(obj.Key)
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if dir != sto.dirPrefix {
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continue
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}
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if file == after {
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continue
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}
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br, ok := blob.Parse(file)
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if !ok {
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return fmt.Errorf("non-Perkeep object named %q found in %v s3 bucket", file, sto.bucket)
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}
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select {
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case dest <- blob.SizedRef{Ref: br, Size: uint32(obj.Size)}:
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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return nil
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}
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