mirror of https://github.com/perkeep/perkeep.git
91 lines
2.1 KiB
Go
91 lines
2.1 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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"path"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/service/s3"
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"perkeep.org/pkg/blob"
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"perkeep.org/pkg/blobserver"
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)
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// s3MaxKeys is the maximum value the S3 API documentation claims is supported
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// for the 'MaxKeys' field
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const s3MaxKeys = 1000
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var _ blobserver.MaxEnumerateConfig = (*s3Storage)(nil)
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func (sto *s3Storage) MaxEnumerate() int { return 1000 }
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func (sto *s3Storage) EnumerateBlobs(ctx context.Context, dest chan<- blob.SizedRef, after string, limit int) (retErr error) {
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defer close(dest)
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if faultEnumerate.FailErr(&retErr) {
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return
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}
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var maxKeys *int64
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if limit < s3MaxKeys {
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maxKeys = aws.Int64(int64(limit))
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}
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keysGotten := 0
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err := sto.client.ListObjectsV2PagesWithContext(ctx, &s3.ListObjectsV2Input{
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Bucket: &sto.bucket,
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StartAfter: aws.String(sto.dirPrefix + after),
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MaxKeys: maxKeys,
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}, func(page *s3.ListObjectsV2Output, lastPage bool) bool {
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for _, obj := range page.Contents {
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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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retErr = fmt.Errorf("non-Perkeep object named %q found in %v s3 bucket", file, sto.bucket)
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return false
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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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retErr = ctx.Err()
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return false
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}
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keysGotten++
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if keysGotten >= limit {
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return false
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}
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}
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return true
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})
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if err == nil {
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err = retErr
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}
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if err != nil {
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return fmt.Errorf("s3 EnumerateBlobs: %v", err)
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}
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return nil
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}
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