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122 lines
3.2 KiB
Go
122 lines
3.2 KiB
Go
// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package gfpool
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import (
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"os"
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"time"
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"github.com/gogf/gf/container/gpool"
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"github.com/gogf/gf/container/gtype"
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"github.com/gogf/gf/os/gfsnotify"
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)
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// New creates and returns a file pointer pool with given file path, flag and opening permission.
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//
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// Note the expiration logic:
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// ttl = 0 : not expired;
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// ttl < 0 : immediate expired after use;
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// ttl > 0 : timeout expired;
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// It is not expired in default.
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func New(path string, flag int, perm os.FileMode, ttl ...time.Duration) *Pool {
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var fpTTL time.Duration
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if len(ttl) > 0 {
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fpTTL = ttl[0]
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}
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p := &Pool{
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id: gtype.NewInt(),
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ttl: fpTTL,
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init: gtype.NewBool(),
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}
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p.pool = newFilePool(p, path, flag, perm, fpTTL)
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return p
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}
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// newFilePool creates and returns a file pointer pool with given file path, flag and opening permission.
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func newFilePool(p *Pool, path string, flag int, perm os.FileMode, ttl time.Duration) *gpool.Pool {
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pool := gpool.New(ttl, func() (interface{}, error) {
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file, err := os.OpenFile(path, flag, perm)
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if err != nil {
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return nil, err
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}
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return &File{
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File: file,
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pid: p.id.Val(),
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pool: p,
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flag: flag,
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perm: perm,
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path: path,
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}, nil
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}, func(i interface{}) {
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_ = i.(*File).File.Close()
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})
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return pool
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}
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// File retrieves file item from the file pointer pool and returns it. It creates one if
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// the file pointer pool is empty.
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// Note that it should be closed when it will never be used. When it's closed, it is not
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// really closed the underlying file pointer but put back to the file pinter pool.
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func (p *Pool) File() (*File, error) {
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if v, err := p.pool.Get(); err != nil {
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return nil, err
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} else {
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var err error
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f := v.(*File)
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f.stat, err = os.Stat(f.path)
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if f.flag&os.O_CREATE > 0 {
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if os.IsNotExist(err) {
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if f.File, err = os.OpenFile(f.path, f.flag, f.perm); err != nil {
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return nil, err
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} else {
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// Retrieve the state of the new created file.
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if f.stat, err = f.File.Stat(); err != nil {
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return nil, err
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}
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}
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}
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}
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if f.flag&os.O_TRUNC > 0 {
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if f.stat.Size() > 0 {
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if err = f.Truncate(0); err != nil {
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return nil, err
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}
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}
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}
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if f.flag&os.O_APPEND > 0 {
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if _, err = f.Seek(0, 2); err != nil {
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return nil, err
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}
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} else {
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if _, err = f.Seek(0, 0); err != nil {
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return nil, err
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}
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}
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// It firstly checks using !p.init.Val() for performance purpose.
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if !p.init.Val() && p.init.Cas(false, true) {
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_, _ = gfsnotify.Add(f.path, func(event *gfsnotify.Event) {
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// If teh file is removed or renamed, recreates the pool by increasing the pool id.
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if event.IsRemove() || event.IsRename() {
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// It drops the old pool.
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p.id.Add(1)
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// Clears the pool items staying in the pool.
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p.pool.Clear()
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// It uses another adding to drop the file items between the two adding.
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// Whenever the pool id changes, the pool will be recreated.
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p.id.Add(1)
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}
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}, false)
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}
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return f, nil
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}
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}
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// Close closes current file pointer pool.
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func (p *Pool) Close() {
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p.pool.Close()
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}
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