69559aa101
This is written so that to simplify our handler code and provide a way to only update metadata instead of the data when source and destination in CopyObject request are same. Fixes #3316
92 lines
2.6 KiB
Go
92 lines
2.6 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 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 cmd
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import "io"
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// Reads from the requested local location uses a staging buffer. Restricts
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// reads upto requested range of length and offset. If successful staging
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// buffer is written to the incoming stream. Returns errors if any.
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func fsReadFile(disk StorageAPI, bucket, object string, writer io.Writer, totalLeft, startOffset int64, buf []byte) (err error) {
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bufSize := int64(len(buf))
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// Start the read loop until requested range.
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for {
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// Figure out the right size for the buffer.
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curLeft := bufSize
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if totalLeft < bufSize {
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curLeft = totalLeft
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}
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// Reads the file at offset.
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nr, er := disk.ReadFile(bucket, object, startOffset, buf[:curLeft])
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if nr > 0 {
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// Write to response writer.
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nw, ew := writer.Write(buf[0:nr])
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if nw > 0 {
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// Decrement whats left to write.
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totalLeft -= int64(nw)
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// Progress the offset
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startOffset += int64(nw)
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}
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if ew != nil {
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err = traceError(ew)
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break
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}
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if nr != int64(nw) {
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err = traceError(io.ErrShortWrite)
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break
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}
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}
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if er == io.EOF || er == io.ErrUnexpectedEOF {
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break
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}
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if er != nil {
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err = traceError(er)
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break
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}
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if totalLeft == 0 {
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break
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}
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}
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return err
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}
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// Reads from input stream until end of file, takes an input buffer for staging reads.
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// The staging buffer is then written to the disk. Returns for any error that occurs
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// while reading the stream or writing to disk. Caller should cleanup partial files.
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// Upon errors total data written will be 0 and returns error, on success returns
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// total data written to disk.
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func fsCreateFile(disk StorageAPI, reader io.Reader, buf []byte, bucket, object string) (int64, error) {
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bytesWritten := int64(0)
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// Read the buffer till io.EOF and appends data to path at bucket/object.
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for {
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n, rErr := reader.Read(buf)
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if rErr != nil && rErr != io.EOF {
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return 0, traceError(rErr)
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}
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bytesWritten += int64(n)
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wErr := disk.AppendFile(bucket, object, buf[0:n])
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if wErr != nil {
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return 0, traceError(wErr)
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}
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if rErr == io.EOF {
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break
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}
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}
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return bytesWritten, nil
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}
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