// Save writes config data in JSON format to a file.
func (d config) Save(filename string) *probe.Error {
d.lock.Lock()
defer d.lock.Unlock()
jsonData, err := json.MarshalIndent(d.data, "", "\t")
if err != nil {
return probe.NewError(err)
}
if runtime.GOOS == "windows" {
jsonData = []byte(strings.Replace(string(jsonData), "\n", "\r\n", -1))
}
atomicFile, err := atomic.FileCreate(filename)
if err != nil {
return probe.NewError(err)
}
_, err = atomicFile.Write(jsonData)
if err != nil {
return probe.NewError(err)
}
err = atomicFile.Close()
if err != nil {
return probe.NewError(err)
}
return nil
}
// CreateFile - create a file inside disk root path, replies with custome disk.File which provides atomic writes
func (disk Disk) CreateFile(filename string) (*atomic.File, *probe.Error) {
disk.lock.Lock()
defer disk.lock.Unlock()
if filename == "" {
return nil, probe.NewError(InvalidArgument{})
}
f, err := atomic.FileCreate(filepath.Join(disk.path, filename))
if err != nil {
return nil, probe.NewError(err)
}
return f, nil
}
// writeFile writes data to a file named by filename.
// If the file does not exist, writeFile creates it;
// otherwise writeFile truncates it before writing.
func writeFile(filename string, data []byte) *probe.Error {
atomicFile, e := atomic.FileCreate(filename)
if e != nil {
return probe.NewError(e)
}
_, e = atomicFile.Write(data)
if e != nil {
return probe.NewError(e)
}
e = atomicFile.Close()
if e != nil {
return probe.NewError(e)
}
return nil
}
// CreateObject - PUT object
func (fs Filesystem) CreateObject(bucket, object, expectedMD5Sum string, size int64, data io.Reader, signature *Signature) (ObjectMetadata, *probe.Error) {
fs.lock.Lock()
defer fs.lock.Unlock()
stfs, err := disk.Stat(fs.path)
if err != nil {
return ObjectMetadata{}, probe.NewError(err)
}
// Remove 5% from total space for cumulative disk space used for journalling, inodes etc.
availableDiskSpace := (float64(stfs.Free) / (float64(stfs.Total) - (0.05 * float64(stfs.Total)))) * 100
if int64(availableDiskSpace) <= fs.minFreeDisk {
return ObjectMetadata{}, probe.NewError(RootPathFull{Path: fs.path})
}
// check bucket name valid
if !IsValidBucket(bucket) {
return ObjectMetadata{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
}
// check bucket exists
if _, err = os.Stat(filepath.Join(fs.path, bucket)); os.IsNotExist(err) {
return ObjectMetadata{}, probe.NewError(BucketNotFound{Bucket: bucket})
}
// verify object path legal
if !IsValidObjectName(object) {
return ObjectMetadata{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
}
// get object path
objectPath := filepath.Join(fs.path, bucket, object)
if strings.TrimSpace(expectedMD5Sum) != "" {
var expectedMD5SumBytes []byte
expectedMD5SumBytes, err = base64.StdEncoding.DecodeString(strings.TrimSpace(expectedMD5Sum))
if err != nil {
// pro-actively close the connection
return ObjectMetadata{}, probe.NewError(InvalidDigest{Md5: expectedMD5Sum})
}
expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
}
// write object
file, err := atomic.FileCreate(objectPath)
if err != nil {
return ObjectMetadata{}, probe.NewError(err)
}
h := md5.New()
sh := sha256.New()
mw := io.MultiWriter(file, h, sh)
if size > 0 {
_, err = io.CopyN(mw, data, size)
if err != nil {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(err)
}
} else {
_, err = io.Copy(mw, data)
if err != nil {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(err)
}
}
md5Sum := hex.EncodeToString(h.Sum(nil))
// Verify if the written object is equal to what is expected, only if it is requested as such
if strings.TrimSpace(expectedMD5Sum) != "" {
if err := isMD5SumEqual(strings.TrimSpace(expectedMD5Sum), md5Sum); err != nil {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(BadDigest{Md5: expectedMD5Sum, Bucket: bucket, Object: object})
}
}
sha256Sum := hex.EncodeToString(sh.Sum(nil))
if signature != nil {
ok, perr := signature.DoesSignatureMatch(sha256Sum)
if perr != nil {
file.CloseAndPurge()
return ObjectMetadata{}, perr.Trace()
}
if !ok {
file.CloseAndPurge()
return ObjectMetadata{}, probe.NewError(SignatureDoesNotMatch{})
}
}
file.File.Sync()
file.Close()
st, err := os.Stat(objectPath)
if err != nil {
return ObjectMetadata{}, probe.NewError(err)
}
newObject := ObjectMetadata{
Bucket: bucket,
Object: object,
Created: st.ModTime(),
Size: st.Size(),
ContentType: "application/octet-stream",
Md5: md5Sum,
}
return newObject, nil
}