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cache: fix fatal error: concurrent map writes - fixes #2378

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This commit is contained in:
Nick Craig-Wood 2019-06-04 17:18:23 +01:00
parent 4499b08afc
commit 08a3957880
1 changed files with 18 additions and 10 deletions
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28
backend/cache/object.go vendored
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@ -24,15 +24,16 @@ const (
type Object struct {
fs.Object `json:"-"`
ParentFs fs.Fs `json:"-"` // parent fs
CacheFs *Fs `json:"-"` // cache fs
Name string `json:"name"` // name of the directory
Dir string `json:"dir"` // abs path of the object
CacheModTime int64 `json:"modTime"` // modification or creation time - IsZero for unknown
CacheSize int64 `json:"size"` // size of directory and contents or -1 if unknown
CacheStorable bool `json:"storable"` // says whether this object can be stored
CacheType string `json:"cacheType"`
CacheTs time.Time `json:"cacheTs"`
ParentFs fs.Fs `json:"-"` // parent fs
CacheFs *Fs `json:"-"` // cache fs
Name string `json:"name"` // name of the directory
Dir string `json:"dir"` // abs path of the object
CacheModTime int64 `json:"modTime"` // modification or creation time - IsZero for unknown
CacheSize int64 `json:"size"` // size of directory and contents or -1 if unknown
CacheStorable bool `json:"storable"` // says whether this object can be stored
CacheType string `json:"cacheType"`
CacheTs time.Time `json:"cacheTs"`
cacheHashesMu sync.Mutex
CacheHashes map[hash.Type]string // all supported hashes cached
refreshMutex sync.Mutex
@ -103,7 +104,9 @@ func (o *Object) updateData(ctx context.Context, source fs.Object) {
o.CacheSize = source.Size()
o.CacheStorable = source.Storable()
o.CacheTs = time.Now()
o.cacheHashesMu.Lock()
o.CacheHashes = make(map[hash.Type]string)
o.cacheHashesMu.Unlock()
}
// Fs returns its FS info
@ -268,7 +271,9 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
o.CacheModTime = src.ModTime(ctx).UnixNano()
o.CacheSize = src.Size()
o.cacheHashesMu.Lock()
o.CacheHashes = make(map[hash.Type]string)
o.cacheHashesMu.Unlock()
o.CacheTs = time.Now()
o.persist()
@ -309,11 +314,12 @@ func (o *Object) Remove(ctx context.Context) error {
// since it might or might not be called, this is lazy loaded
func (o *Object) Hash(ctx context.Context, ht hash.Type) (string, error) {
_ = o.refresh(ctx)
o.cacheHashesMu.Lock()
if o.CacheHashes == nil {
o.CacheHashes = make(map[hash.Type]string)
}
cachedHash, found := o.CacheHashes[ht]
o.cacheHashesMu.Unlock()
if found {
return cachedHash, nil
}
@ -324,7 +330,9 @@ func (o *Object) Hash(ctx context.Context, ht hash.Type) (string, error) {
if err != nil {
return "", err
}
o.cacheHashesMu.Lock()
o.CacheHashes[ht] = liveHash
o.cacheHashesMu.Unlock()
o.persist()
fs.Debugf(o, "object hash cached: %v", liveHash)