/
s3.go
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/
s3.go
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//
// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
//
// 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
//
// https://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.
//
package s3
import (
"context"
"io"
"reflect"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/vdaas/vald/internal/backoff"
"github.com/vdaas/vald/internal/db/storage/blob"
"github.com/vdaas/vald/internal/db/storage/blob/s3/reader"
"github.com/vdaas/vald/internal/db/storage/blob/s3/writer"
"github.com/vdaas/vald/internal/errgroup"
"github.com/vdaas/vald/internal/errors"
)
type client struct {
eg errgroup.Group
session *session.Session
service *s3.S3
bucket string
maxPartSize int64
maxChunkSize int64
reader reader.Reader
writer writer.Writer
readerBackoffEnabled bool
readerBackoffOpts []backoff.Option
}
// New returns blob.Bucket implementation if no error occurs.
func New(opts ...Option) (b blob.Bucket, err error) {
c := new(client)
for _, opt := range append(defaultOptions, opts...) {
if err := opt(c); err != nil {
return nil, errors.ErrOptionFailed(err, reflect.ValueOf(opt))
}
}
if c.session == nil {
return nil, errors.NewErrInvalidOption("session", c.session)
}
c.service = s3.New(c.session)
if c.writer == nil {
c.writer = writer.New(
writer.WithErrGroup(c.eg),
writer.WithService(c.service),
writer.WithBucket(c.bucket),
writer.WithMaxPartSize(c.maxPartSize),
)
}
if c.reader == nil {
c.reader, err = reader.New(
reader.WithErrGroup(c.eg),
reader.WithService(c.service),
reader.WithBucket(c.bucket),
reader.WithMaxChunkSize(c.maxChunkSize),
reader.WithBackoff(c.readerBackoffEnabled),
reader.WithBackoffOpts(c.readerBackoffOpts...),
)
if err != nil {
return nil, err
}
}
return c, nil
}
// Open does nothing. Always returns nil.
func (c *client) Open(ctx context.Context) (err error) {
return nil
}
// Close does nothing. Always returns nil.
func (c *client) Close() error {
return nil
}
// Reader creates reader.Reader implementation and returns it.
// An error will be returned when the reader initialization fails or an error occurs in reader.Open.
func (c *client) Reader(ctx context.Context, key string) (rc io.ReadCloser, err error) {
err = c.reader.Open(ctx, key)
if err != nil {
return nil, err
}
return c.reader, nil
}
// Writer creates writer.Writer implementation and returns it.
// An error will be returned when the writer initialization fails or an error occurs in writer.Open.
func (c *client) Writer(ctx context.Context, key string) (wc io.WriteCloser, err error) {
err = c.writer.Open(ctx, key)
if err != nil {
return nil, err
}
return c.writer, nil
}