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storage_mount.go
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storage_mount.go
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/**
* OpenBmclAPI (Golang Edition)
* Copyright (C) 2024 Kevin Z <zyxkad@gmail.com>
* All rights reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/LiterMC/go-openbmclapi/internal/gosrc"
)
var errNotWorking = errors.New("storage is down")
type MountStorageOption struct {
Path string `yaml:"path"`
RedirectBase string `yaml:"redirect-base"`
PreGenMeasures bool `yaml:"pre-gen-measures"`
}
func (opt *MountStorageOption) CachePath() string {
return filepath.Join(opt.Path, "download")
}
type MountStorage struct {
opt MountStorageOption
supportRange atomic.Bool
working atomic.Int32
checkMux sync.RWMutex
lastCheck time.Time
}
var _ Storage = (*MountStorage)(nil)
func init() {
RegisterStorageFactory(StorageMount, StorageFactory{
New: func() Storage { return new(MountStorage) },
NewConfig: func() any { return new(MountStorageOption) },
})
}
func (s *MountStorage) String() string {
return fmt.Sprintf("<MountStorage path=%q redirect=%q>", s.opt.Path, s.opt.RedirectBase)
}
func (s *MountStorage) Options() any {
return &s.opt
}
func (s *MountStorage) SetOptions(newOpts any) {
s.opt = *(newOpts.(*MountStorageOption))
}
var checkerClient = &http.Client{
Timeout: time.Minute,
}
func (s *MountStorage) Init(ctx context.Context) (err error) {
logInfof("Initalizing mounted folder %s", s.opt.Path)
if err = initCache(s.opt.CachePath()); err != nil {
return
}
if err := os.MkdirAll(s.opt.Path, 0755); err != nil && !errors.Is(err, os.ErrExist) {
logErrorf("Cannot create mirror folder %q: %v", s.opt.Path, err)
os.Exit(2)
}
measureDir := filepath.Join(s.opt.Path, "measure")
if err := os.Mkdir(measureDir, 0755); err != nil && !errors.Is(err, os.ErrExist) {
logErrorf("Cannot create mirror folder %q: %v", measureDir, err)
os.Exit(2)
}
if s.opt.PreGenMeasures {
logInfo("Creating measure files")
for i := 1; i <= 200; i++ {
if err := s.createMeasureFile(i); err != nil {
os.Exit(2)
}
}
logInfo("Measure files created")
}
supportRange, err := s.checkAlive(ctx, 10)
if err != nil {
return
}
s.supportRange.Store(supportRange)
s.working.Store(1)
return
}
func (s *MountStorage) hashToPath(hash string) string {
return filepath.Join(s.opt.CachePath(), hash[0:2], hash)
}
func (s *MountStorage) Size(hash string) (int64, error) {
stat, err := os.Stat(s.hashToPath(hash))
if err != nil {
return 0, err
}
return stat.Size(), nil
}
func (s *MountStorage) Open(hash string) (io.ReadCloser, error) {
return os.Open(s.hashToPath(hash))
}
func (s *MountStorage) Create(hash string, r io.ReadSeeker) error {
fd, err := os.Create(s.hashToPath(hash))
if err != nil {
return err
}
var buf [1024 * 512]byte
_, err = io.CopyBuffer(fd, r, buf[:])
if e := fd.Close(); e != nil && err == nil {
err = e
}
return err
}
func (s *MountStorage) Remove(hash string) error {
return os.Remove(s.hashToPath(hash))
}
func (s *MountStorage) WalkDir(walker func(hash string, size int64) error) error {
return walkCacheDir(s.opt.CachePath(), walker)
}
func (s *MountStorage) ServeDownload(rw http.ResponseWriter, req *http.Request, hash string, size int64) (int64, error) {
now := time.Now()
if s.working.Load() != 1 {
if !s.working.CompareAndSwap(0, 2) {
return 0, errNotWorking
}
s.checkMux.Lock()
needCheck := now.Sub(s.lastCheck) > time.Minute*3
if needCheck {
s.lastCheck = now
}
s.checkMux.Unlock()
if !needCheck {
s.working.Store(0)
return 0, errNotWorking
}
tctx, cancel := context.WithTimeout(req.Context(), time.Second*5)
supportRange, err := s.checkAlive(tctx, 0)
cancel()
if err != nil {
s.working.Store(0)
return 0, errNotWorking
}
s.supportRange.Store(supportRange)
s.working.Store(1)
} else {
s.checkMux.RLock()
lastCheck := s.lastCheck
s.checkMux.RUnlock()
if now.Sub(lastCheck) > time.Minute*3 {
go func() {
s.checkMux.Lock()
if s.lastCheck != lastCheck {
s.checkMux.Unlock()
return
}
s.lastCheck = now
s.checkMux.Unlock()
tctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
if supportRange, err := s.checkAlive(tctx, 0); err == nil {
s.supportRange.Store(supportRange)
s.working.Store(1)
} else {
s.working.Store(0)
}
}()
}
}
target, err := url.JoinPath(s.opt.RedirectBase, "download", hash[:2], hash)
if err != nil {
return 0, err
}
if s.supportRange.Load() { // fix the size for Ranged request
rg := req.Header.Get("Range")
rgs, err := gosrc.ParseRange(rg, size)
if err == nil && len(rgs) > 0 {
var newSize int64 = 0
for _, r := range rgs {
newSize += r.Length
}
if newSize < size {
size = newSize
}
}
}
http.Redirect(rw, req, target, http.StatusFound)
return size, nil
}
func (s *MountStorage) ServeMeasure(rw http.ResponseWriter, req *http.Request, size int) error {
if err := s.createMeasureFile(size); err != nil {
return err
}
target, err := url.JoinPath(s.opt.RedirectBase, "measure", strconv.Itoa(size))
if err != nil {
return err
}
http.Redirect(rw, req, target, http.StatusFound)
return nil
}
func (s *MountStorage) createMeasureFile(size int) (err error) {
t := filepath.Join(s.opt.Path, "measure", strconv.Itoa(size))
logDebugf("Checking measure file %q", t)
if stat, err := os.Stat(t); err == nil {
tsz := (int64)(size) * mbChunkSize
if size == 0 {
tsz = 2
}
x := stat.Size()
if x == tsz {
return nil
}
logDebugf("File [%d] size %d does not match %d", size, x, tsz)
} else if !errors.Is(err, os.ErrNotExist) {
logErrorf("Cannot get stat of %s: %v", t, err)
}
logInfof("Creating measure file at %q", t)
fd, err := os.Create(t)
if err != nil {
logErrorf("Cannot create mirror measure file %q: %v", t, err)
return
}
defer fd.Close()
if size == 0 {
if _, err = fd.Write(mbChunk[:2]); err != nil {
logErrorf("Cannot write mirror measure file %q: %v", t, err)
return
}
} else {
for j := 0; j < size; j++ {
if _, err = fd.Write(mbChunk[:]); err != nil {
logErrorf("Cannot write mirror measure file %q: %v", t, err)
return
}
}
}
return nil
}
func (s *MountStorage) checkAlive(ctx context.Context, size int) (supportRange bool, err error) {
var targetSize int64
if size == 0 {
targetSize = 2
} else {
targetSize = (int64)(size) * 1024 * 1024
}
logInfof("Checking %s for %d bytes ...", s.opt.RedirectBase, targetSize)
if err = s.createMeasureFile(size); err != nil {
return
}
target, err := url.JoinPath(s.opt.RedirectBase, "measure", strconv.Itoa(size))
if err != nil {
return false, fmt.Errorf("Cannot check webdav server: %w", err)
}
req, err := http.NewRequestWithContext(ctx, http.MethodGet, target, nil)
if err != nil {
return
}
req.Header.Set("Range", "bytes=1-")
req.Header.Set("User-Agent", ClusterUserAgentFull)
res, err := checkerClient.Do(req)
if err != nil {
return false, fmt.Errorf("Check request failed %q: %w", target, err)
}
defer res.Body.Close()
logDebugf("Webdav check response status code %d %s", res.StatusCode, res.Status)
if supportRange = res.StatusCode == http.StatusPartialContent; supportRange {
logDebug("Webdav support Range header!")
targetSize--
} else if res.StatusCode != http.StatusOK {
return false, fmt.Errorf("Check request failed %q: %d %s", target, res.StatusCode, res.Status)
} else {
crange := res.Header.Get("Content-Range")
if len(crange) > 0 {
logWarn("Non standard http response detected, responsed 'Content-Range' header with status 200, expected status 206")
fields := strings.Fields(crange)
if len(fields) >= 2 && fields[0] == "bytes" && strings.HasPrefix(fields[1], "1-") {
logDebug("Webdav support Range header?")
supportRange = true
targetSize--
}
}
}
logDebug("reading webdav server response")
start := time.Now()
n, err := io.Copy(io.Discard, res.Body)
if err != nil {
return false, fmt.Errorf("Webdav check request failed %q: %w", target, err)
}
used := time.Since(start)
if n != targetSize {
return false, fmt.Errorf("Webdav check request failed %q: expected %d bytes, but got %d bytes", target, targetSize, n)
}
rate := (float64)(n) / used.Seconds()
logInfof("Check finished for %q, used %v, %s/s; supportRange=%v", target, used, bytesToUnit(rate), supportRange)
return
}