wehub-resource-sync
57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
// Copyright 2019-2021 Dolthub, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
// This file incorporates work covered by the following copyright and
|
|
// permission notice:
|
|
//
|
|
// Copyright 2016 Attic Labs, Inc. All rights reserved.
|
|
// Licensed under the Apache License, version 2.0:
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
package nbs
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
)
|
|
|
|
const (
|
|
s3RangePrefix = "bytes"
|
|
s3BlockSize = (1 << 10) * 512 // 512K
|
|
)
|
|
|
|
type s3TableReaderAt struct {
|
|
s3 *s3ObjectReader
|
|
key string
|
|
}
|
|
|
|
func (s3tra *s3TableReaderAt) Close() error {
|
|
return nil
|
|
}
|
|
|
|
func (s3tra *s3TableReaderAt) clone() (tableReaderAt, error) {
|
|
return s3tra, nil
|
|
}
|
|
|
|
func (s3tra *s3TableReaderAt) Reader(ctx context.Context) (io.ReadCloser, error) {
|
|
return s3tra.s3.reader(ctx, s3tra.key)
|
|
}
|
|
|
|
func (s3tra *s3TableReaderAt) ReadAtWithStats(ctx context.Context, p []byte, off int64, stats *Stats) (n int, err error) {
|
|
return s3tra.s3.ReadAt(ctx, s3tra.key, p, off, stats)
|
|
}
|
|
|
|
const maxS3ReadFromEndReqSize = 256 * 1024 * 1024 // 256MB
|
|
const preferredS3ReadFromEndReqSize = 128 * 1024 * 1024 // 128MB
|