github.com/zntrio/harp/v2@v2.0.9/pkg/bundle/fs/file.go (about)

     1  // Licensed to Elasticsearch B.V. under one or more contributor
     2  // license agreements. See the NOTICE file distributed with
     3  // this work for additional information regarding copyright
     4  // ownership. Elasticsearch B.V. licenses this file to you under
     5  // the Apache License, Version 2.0 (the "License"); you may
     6  // not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing,
    12  // software distributed under the License is distributed on an
    13  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    14  // KIND, either express or implied.  See the License for the
    15  // specific language governing permissions and limitations
    16  // under the License.
    17  
    18  //go:build go1.16
    19  // +build go1.16
    20  
    21  package fs
    22  
    23  import (
    24  	"io"
    25  	"io/fs"
    26  	"os"
    27  	"time"
    28  
    29  	"github.com/awnumar/memguard"
    30  )
    31  
    32  type file struct {
    33  	modTime    time.Time
    34  	name       string
    35  	bodyReader io.Reader
    36  	size       int64
    37  	content    *memguard.Enclave
    38  	mode       os.FileMode
    39  	closed     bool
    40  }
    41  
    42  // Compile time type assertion.
    43  var _ fs.File = (*file)(nil)
    44  
    45  // -----------------------------------------------------------------------------
    46  
    47  func (f *file) Stat() (fs.FileInfo, error) {
    48  	// Check file state
    49  	if f.closed {
    50  		return nil, fs.ErrClosed
    51  	}
    52  
    53  	// Return file information
    54  	return &fileInfo{
    55  		name:    f.name,
    56  		size:    f.size,
    57  		modTime: f.modTime,
    58  		mode:    f.mode,
    59  	}, nil
    60  }
    61  
    62  func (f *file) Read(b []byte) (int, error) {
    63  	// Check file state
    64  	if f.closed || f.bodyReader == nil {
    65  		return 0, fs.ErrClosed
    66  	}
    67  
    68  	// Delegate to reader
    69  	return f.bodyReader.Read(b)
    70  }
    71  
    72  func (f *file) Close() error {
    73  	if f.closed {
    74  		return fs.ErrClosed
    75  	}
    76  	f.closed = true
    77  	f.bodyReader = nil
    78  	return nil
    79  }