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Copy pathdisk-cache-utils.go
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Copy pathdisk-cache-utils.go
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267 lines (233 loc) · 5.94 KB
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/*
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"encoding/hex"
"io"
"os"
"path"
"strconv"
"strings"
"time"
"github.com/minio/minio/cmd/crypto"
)
// CacheStatusType - whether the request was served from cache.
type CacheStatusType string
const (
// CacheHit - whether object was served from cache.
CacheHit CacheStatusType = "HIT"
// CacheMiss - object served from backend.
CacheMiss CacheStatusType = "MISS"
)
func (c CacheStatusType) String() string {
if c != "" {
return string(c)
}
return string(CacheMiss)
}
type cacheControl struct {
expiry time.Time
maxAge int
sMaxAge int
minFresh int
maxStale int
noStore bool
onlyIfCached bool
noCache bool
}
func (c cacheControl) isEmpty() bool {
return c == cacheControl{}
}
func (c cacheControl) isStale(modTime time.Time) bool {
if c.isEmpty() {
return false
}
// response will never be stale if only-if-cached is set
if c.onlyIfCached {
return false
}
// Cache-Control value no-store indicates never cache
if c.noStore {
return true
}
// Cache-Control value no-cache indicates cache entry needs to be revalidated before
// serving from cache
if c.noCache {
return true
}
now := time.Now()
if c.sMaxAge > 0 && c.sMaxAge < int(now.Sub(modTime).Seconds()) {
return true
}
if c.maxAge > 0 && c.maxAge < int(now.Sub(modTime).Seconds()) {
return true
}
if !c.expiry.Equal(time.Time{}) && c.expiry.Before(time.Now().Add(time.Duration(c.maxStale))) {
return true
}
if c.minFresh > 0 && c.minFresh <= int(now.Sub(modTime).Seconds()) {
return true
}
return false
}
// returns struct with cache-control settings from user metadata.
func cacheControlOpts(o ObjectInfo) (c cacheControl) {
m := o.UserDefined
if o.Expires != timeSentinel {
c.expiry = o.Expires
}
var headerVal string
for k, v := range m {
if strings.ToLower(k) == "cache-control" {
headerVal = v
}
}
if headerVal == "" {
return
}
headerVal = strings.ToLower(headerVal)
headerVal = strings.TrimSpace(headerVal)
vals := strings.Split(headerVal, ",")
for _, val := range vals {
val = strings.TrimSpace(val)
if val == "no-store" {
c.noStore = true
continue
}
if val == "only-if-cached" {
c.>
continue
}
if val == "no-cache" {
c.noCache = true
continue
}
p := strings.Split(val, "=")
if len(p) != 2 {
continue
}
if p[0] == "max-age" ||
p[0] == "s-maxage" ||
p[0] == "min-fresh" ||
p[0] == "max-stale" {
i, err := strconv.Atoi(p[1])
if err != nil {
return cacheControl{}
}
if p[0] == "max-age" {
c.maxAge = i
}
if p[0] == "s-maxage" {
c.sMaxAge = i
}
if p[0] == "min-fresh" {
c.minFresh = i
}
if p[0] == "max-stale" {
c.maxStale = i
}
}
}
return c
}
// backendDownError returns true if err is due to backend failure or faulty disk if in server mode
func backendDownError(err error) bool {
_, backendDown := err.(BackendDown)
return backendDown || IsErr(err, baseErrs...)
}
// IsCacheable returns if the object should be saved in the cache.
func (o ObjectInfo) IsCacheable() bool {
return !crypto.IsEncrypted(o.UserDefined) || globalCacheKMS != nil
}
// reads file cached on disk from offset upto length
func readCacheFileStream(filePath string, offset, length int64) (io.ReadCloser, error) {
if filePath == "" || offset < 0 {
return nil, errInvalidArgument
}
if err := checkPathLength(filePath); err != nil {
return nil, err
}
fr, err := os.Open(filePath)
if err != nil {
return nil, osErrToFSFileErr(err)
}
// Stat to ge
765A
t the size of the file at path.
st, err := fr.Stat()
if err != nil {
err = osErrToFSFileErr(err)
return nil, err
}
if err = os.Chtimes(filePath, time.Now(), st.ModTime()); err != nil {
return nil, err
}
// Verify if its not a regular file, since subsequent Seek is undefined.
if !st.Mode().IsRegular() {
return nil, errIsNotRegular
}
if err = os.Chtimes(filePath, time.Now(), st.ModTime()); err != nil {
return nil, err
}
// Seek to the requested offset.
if offset > 0 {
_, err = fr.Seek(offset, io.SeekStart)
if err != nil {
return nil, err
}
}
return struct {
io.Reader
io.Closer
}{Reader: io.LimitReader(fr, length), Closer: fr}, nil
}
func isCacheEncrypted(meta map[string]string) bool {
_, ok := meta[SSECacheEncrypted]
return ok
}
// decryptCacheObjectETag tries to decrypt the ETag saved in encrypted format using the cache KMS
func decryptCacheObjectETag(info *ObjectInfo) error {
// Directories are never encrypted.
if info.IsDir {
return nil
}
encrypted := crypto.S3.IsEncrypted(info.UserDefined) && isCacheEncrypted(info.UserDefined)
switch {
case encrypted:
if globalCacheKMS == nil {
return errKMSNotConfigured
}
keyID, kmsKey, sealedKey, err := crypto.S3.ParseMetadata(info.UserDefined)
if err != nil {
return err
}
extKey, err := globalCacheKMS.UnsealKey(keyID, kmsKey, crypto.Context{info.Bucket: path.Join(info.Bucket, info.Name)})
if err != nil {
return err
}
var objectKey crypto.ObjectKey
if err = objectKey.Unseal(extKey, sealedKey, crypto.S3.String(), info.Bucket, info.Name); err != nil {
return err
}
etagStr := tryDecryptETag(objectKey[:], info.ETag, false)
// backend ETag was hex encoded before encrypting, so hex decode to get actual ETag
etag, err := hex.DecodeString(etagStr)
if err != nil {
return err
}
info.ETag = string(etag)
return nil
}
return nil
}
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