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author | Harshavardhana <harsha@minio.io> | 2016-10-26 05:21:07 -0700 |
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committer | Christopher Speller <crspeller@gmail.com> | 2016-10-26 08:21:07 -0400 |
commit | f02620b291b988848392c455a7719699f6b5c00f (patch) | |
tree | 695e07607e86b000b9fe78e77df7f33673f1a755 /vendor/github.com/minio/minio-go/api-get-object-file.go | |
parent | b354d25d3731b53613489d95cfa4c946cf8e0888 (diff) | |
download | chat-f02620b291b988848392c455a7719699f6b5c00f.tar.gz chat-f02620b291b988848392c455a7719699f6b5c00f.tar.bz2 chat-f02620b291b988848392c455a7719699f6b5c00f.zip |
Moving away from goamz to use minio-go instead. (#4193)
minio-go does fully managed way of handling S3 API requests
- Automatic bucket location management across all s3 regions.
- Transparently upload large files in multipart if file 64MB
or larger.
- Right GetObject() API provides compatibility with
io.ReadWriteSeeker interface.
- Various other APIs including bulk deletes, server side object
copy, bucket policies and bucket notifications.
Fixes #4182
Diffstat (limited to 'vendor/github.com/minio/minio-go/api-get-object-file.go')
-rw-r--r-- | vendor/github.com/minio/minio-go/api-get-object-file.go | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/vendor/github.com/minio/minio-go/api-get-object-file.go b/vendor/github.com/minio/minio-go/api-get-object-file.go new file mode 100644 index 000000000..a38fc852a --- /dev/null +++ b/vendor/github.com/minio/minio-go/api-get-object-file.go @@ -0,0 +1,104 @@ +/* + * Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015 Minio, 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. + */ + +package minio + +import ( + "io" + "os" + "path/filepath" +) + +// FGetObject - download contents of an object to a local file. +func (c Client) FGetObject(bucketName, objectName, filePath string) error { + // Input validation. + if err := isValidBucketName(bucketName); err != nil { + return err + } + if err := isValidObjectName(objectName); err != nil { + return err + } + + // Verify if destination already exists. + st, err := os.Stat(filePath) + if err == nil { + // If the destination exists and is a directory. + if st.IsDir() { + return ErrInvalidArgument("fileName is a directory.") + } + } + + // Proceed if file does not exist. return for all other errors. + if err != nil { + if !os.IsNotExist(err) { + return err + } + } + + // Extract top level directory. + objectDir, _ := filepath.Split(filePath) + if objectDir != "" { + // Create any missing top level directories. + if err := os.MkdirAll(objectDir, 0700); err != nil { + return err + } + } + + // Gather md5sum. + objectStat, err := c.StatObject(bucketName, objectName) + if err != nil { + return err + } + + // Write to a temporary file "fileName.part.minio" before saving. + filePartPath := filePath + objectStat.ETag + ".part.minio" + + // If exists, open in append mode. If not create it as a part file. + filePart, err := os.OpenFile(filePartPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600) + if err != nil { + return err + } + + // Issue Stat to get the current offset. + st, err = filePart.Stat() + if err != nil { + return err + } + + // Seek to current position for incoming reader. + objectReader, objectStat, err := c.getObject(bucketName, objectName, st.Size(), 0) + if err != nil { + return err + } + + // Write to the part file. + if _, err = io.CopyN(filePart, objectReader, objectStat.Size); err != nil { + return err + } + + // Close the file before rename, this is specifically needed for Windows users. + if err = filePart.Close(); err != nil { + return err + } + + // Safely completed. Now commit by renaming to actual filename. + if err = os.Rename(filePartPath, filePath); err != nil { + return err + } + + // Return. + return nil +} |