forked from gitea/gitea
128 lines
3.4 KiB
Go
128 lines
3.4 KiB
Go
/*
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* MinIO Go Library for Amazon S3 Compatible Cloud Storage
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* Copyright 2015-2017 MinIO, Inc.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 minio
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import (
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"context"
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"io"
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"os"
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"path/filepath"
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"github.com/minio/minio-go/v7/pkg/s3utils"
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)
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// FGetObject - download contents of an object to a local file.
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// The options can be used to specify the GET request further.
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func (c Client) FGetObject(ctx context.Context, bucketName, objectName, filePath string, opts GetObjectOptions) error {
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// Input validation.
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if err := s3utils.CheckValidBucketName(bucketName); err != nil {
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return err
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}
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if err := s3utils.CheckValidObjectName(objectName); err != nil {
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return err
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}
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// Verify if destination already exists.
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st, err := os.Stat(filePath)
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if err == nil {
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// If the destination exists and is a directory.
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if st.IsDir() {
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return errInvalidArgument("fileName is a directory.")
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}
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}
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// Proceed if file does not exist. return for all other errors.
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if err != nil {
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if !os.IsNotExist(err) {
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return err
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}
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}
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// Extract top level directory.
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objectDir, _ := filepath.Split(filePath)
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if objectDir != "" {
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// Create any missing top level directories.
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if err := os.MkdirAll(objectDir, 0700); err != nil {
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return err
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}
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}
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// Gather md5sum.
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objectStat, err := c.StatObject(ctx, bucketName, objectName, StatObjectOptions(opts))
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if err != nil {
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return err
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}
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// Write to a temporary file "fileName.part.minio" before saving.
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filePartPath := filePath + objectStat.ETag + ".part.minio"
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// If exists, open in append mode. If not create it as a part file.
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filePart, err := os.OpenFile(filePartPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
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if err != nil {
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return err
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}
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// If we return early with an error, be sure to close and delete
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// filePart. If we have an error along the way there is a chance
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// that filePart is somehow damaged, and we should discard it.
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closeAndRemove := true
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defer func() {
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if closeAndRemove {
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_ = filePart.Close()
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_ = os.Remove(filePartPath)
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}
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}()
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// Issue Stat to get the current offset.
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st, err = filePart.Stat()
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if err != nil {
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return err
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}
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// Initialize get object request headers to set the
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// appropriate range offsets to read from.
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if st.Size() > 0 {
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opts.SetRange(st.Size(), 0)
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}
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// Seek to current position for incoming reader.
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objectReader, objectStat, _, err := c.getObject(ctx, bucketName, objectName, opts)
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if err != nil {
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return err
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}
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// Write to the part file.
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if _, err = io.CopyN(filePart, objectReader, objectStat.Size); err != nil {
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return err
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}
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// Close the file before rename, this is specifically needed for Windows users.
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closeAndRemove = false
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if err = filePart.Close(); err != nil {
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return err
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}
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// Safely completed. Now commit by renaming to actual filename.
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if err = os.Rename(filePartPath, filePath); err != nil {
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return err
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}
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// Return.
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return nil
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}
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