/
s3.go
86 lines (75 loc) · 2.35 KB
/
s3.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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.
package storage
import (
"context"
"errors"
"fmt"
pathutil "path"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3iface"
)
// S3 Backend object storage manager
func S3(client s3iface.S3API, bucket, prefix string) Backend {
return &s3Backend{
client: client,
bucket: bucket,
prefix: prefix,
}
}
// -----------------------------------------------------------------------------
// s3Backend is a storage backend for Amazon S3
type s3Backend struct {
client s3iface.S3API
bucket string
prefix string
}
// GetObject retrieves an object from Amazon S3 bucket, at prefix
func (b *s3Backend) GetObject(ctx context.Context, path string) (*Object, error) {
// Check parameters
if b.client == nil {
return nil, errors.New("s3: client is nil")
}
// Prepare request
input := &s3.GetObjectInput{
Bucket: aws.String(b.bucket),
Key: aws.String(pathutil.Join(b.prefix, path)),
}
// Get object from bucket
result, err := b.client.GetObjectWithContext(ctx, input)
if err != nil {
var aerr awserr.Error
if errors.As(err, &aerr) {
switch aerr.Code() {
case s3.ErrCodeNoSuchKey:
return nil, fmt.Errorf("s3: object not found '%s'", *input.Key)
default:
return nil, fmt.Errorf("s3: unable to retrieve object: %w", aerr)
}
}
return nil, fmt.Errorf("s3: unable to process request: %w", err)
}
// Assemble response
var object Object
object.Path = path
object.Content = result.Body
object.LastModified = *result.LastModified
// No error
return &object, nil
}