mirror of https://github.com/minio/minio.git
92 lines
2.5 KiB
Go
92 lines
2.5 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package ioutil
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import (
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"io"
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"io/fs"
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"os"
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"github.com/minio/minio/internal/disk"
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)
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var (
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// OpenFileDirectIO allows overriding default function.
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OpenFileDirectIO = disk.OpenFileDirectIO
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// OsOpen allows overriding default function.
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OsOpen = os.Open
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// OsOpenFile allows overriding default function.
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OsOpenFile = os.OpenFile
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)
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// ReadFileWithFileInfo reads the named file and returns the contents.
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// A successful call returns err == nil, not err == EOF.
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// Because ReadFile reads the whole file, it does not treat an EOF from Read
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// as an error to be reported, additionall returns os.FileInfo
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func ReadFileWithFileInfo(name string) ([]byte, fs.FileInfo, error) {
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f, err := OsOpen(name)
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if err != nil {
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return nil, nil, err
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}
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defer f.Close()
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st, err := f.Stat()
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if err != nil {
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return nil, nil, err
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}
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dst := make([]byte, st.Size())
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_, err = io.ReadFull(f, dst)
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return dst, st, err
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}
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// ReadFile reads the named file and returns the contents.
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// A successful call returns err == nil, not err == EOF.
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// Because ReadFile reads the whole file, it does not treat an EOF from Read
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// as an error to be reported.
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//
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// passes NOATIME flag for reads on Unix systems to avoid atime updates.
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func ReadFile(name string) ([]byte, error) {
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f, err := OpenFileDirectIO(name, readMode, 0o666)
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if err != nil {
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// fallback if there is an error to read
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// 'name' with O_DIRECT
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f, err = OsOpenFile(name, readMode, 0o666)
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if err != nil {
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return nil, err
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}
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}
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r := &ODirectReader{
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File: f,
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SmallFile: true,
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}
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defer r.Close()
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st, err := f.Stat()
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if err != nil {
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return io.ReadAll(r)
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}
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// Select bigger blocks when reading at least 50% of a big block.
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r.SmallFile = st.Size() <= BlockSizeLarge/2
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dst := make([]byte, st.Size())
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_, err = io.ReadFull(r, dst)
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return dst, err
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}
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