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package weed_server
import (
"context"
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/operation"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/golang/protobuf/proto"
"strings"
"time"
)
func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.DownloadToLocalRequest) (*filer_pb.DownloadToLocalResponse, error) {
// load all mappings
mappingEntry, err := fs.filer.FindEntry(ctx, util.JoinPath(filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE))
if err != nil {
return nil, err
}
mappings, err := filer.UnmarshalRemoteStorageMappings(mappingEntry.Content)
if err != nil {
return nil, err
}
// find mapping
var remoteStorageMountedLocation *filer_pb.RemoteStorageLocation
var localMountedDir string
for k, loc := range mappings.Mappings {
if strings.HasPrefix(req.Directory, k) {
localMountedDir, remoteStorageMountedLocation = k, loc
}
}
if localMountedDir == "" {
return nil, fmt.Errorf("%s is not mounted", req.Directory)
}
// find storage configuration
storageConfEntry, err := fs.filer.FindEntry(ctx, util.JoinPath(filer.DirectoryEtcRemote, remoteStorageMountedLocation.Name+filer.REMOTE_STORAGE_CONF_SUFFIX))
if err != nil {
return nil, err
}
storageConf := &filer_pb.RemoteConf{}
if unMarshalErr := proto.Unmarshal(storageConfEntry.Content, storageConf); unMarshalErr != nil {
return nil, fmt.Errorf("unmarshal remote storage conf %s/%s: %v", filer.DirectoryEtcRemote, remoteStorageMountedLocation.Name+filer.REMOTE_STORAGE_CONF_SUFFIX, unMarshalErr)
}
// find the entry
entry, err := fs.filer.FindEntry(ctx, util.JoinPath(req.Directory, req.Name))
if err == filer_pb.ErrNotFound {
return nil, err
}
resp := &filer_pb.DownloadToLocalResponse{}
if entry.Remote == nil || entry.Remote.RemoteSize == 0 {
return resp, nil
}
// detect storage option
so, err := fs.detectStorageOption(req.Directory, "", "000", 0, "", "", "")
if err != nil {
return resp, err
}
assignRequest, altRequest := so.ToAssignRequests(1)
// find a good chunk size
chunkSize := int64(5 * 1024 * 1024)
chunkCount := entry.Remote.RemoteSize/chunkSize + 1
for chunkCount > 1000 && chunkSize < int64(fs.option.MaxMB)*1024*1024/2 {
chunkSize *= 2
chunkCount = entry.Remote.RemoteSize/chunkSize + 1
}
dest := util.FullPath(remoteStorageMountedLocation.Path).Child(string(util.FullPath(req.Directory).Child(req.Name))[len(localMountedDir):])
var chunks []*filer_pb.FileChunk
// FIXME limit on parallel
for offset := int64(0); offset < entry.Remote.RemoteSize; offset += chunkSize {
size := chunkSize
if offset+chunkSize > entry.Remote.RemoteSize {
size = entry.Remote.RemoteSize - offset
}
// assign one volume server
assignResult, err := operation.Assign(fs.filer.GetMaster, fs.grpcDialOption, assignRequest, altRequest)
if err != nil {
return resp, err
}
if assignResult.Error != "" {
return resp, fmt.Errorf("assign: %v", assignResult.Error)
}
fileId, parseErr := needle.ParseFileIdFromString(assignResult.Fid)
if assignResult.Error != "" {
return resp, fmt.Errorf("unrecognized file id %s: %v", assignResult.Fid, parseErr)
}
// tell filer to tell volume server to download into needles
err = operation.WithVolumeServerClient(assignResult.Url, fs.grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
_, fetchAndWriteErr := volumeServerClient.FetchAndWriteNeedle(context.Background(), &volume_server_pb.FetchAndWriteNeedleRequest{
VolumeId: uint32(fileId.VolumeId),
NeedleId: uint64(fileId.Key),
Cookie: uint32(fileId.Cookie),
Offset: offset,
Size: size,
RemoteType: storageConf.Type,
RemoteName: storageConf.Name,
S3AccessKey: storageConf.S3AccessKey,
S3SecretKey: storageConf.S3SecretKey,
S3Region: storageConf.S3Region,
S3Endpoint: storageConf.S3Endpoint,
RemoteBucket: remoteStorageMountedLocation.Bucket,
RemotePath: string(dest),
})
if fetchAndWriteErr != nil {
return fmt.Errorf("volume server %s fetchAndWrite %s: %v", assignResult.Url, dest, fetchAndWriteErr)
}
return nil
})
if err != nil {
return nil, err
}
chunks = append(chunks, &filer_pb.FileChunk{
FileId: assignResult.Fid,
Offset: offset,
Size: uint64(size),
Mtime: time.Now().Unix(),
Fid: &filer_pb.FileId{
VolumeId: uint32(fileId.VolumeId),
FileKey: uint64(fileId.Key),
Cookie: uint32(fileId.Cookie),
},
})
}
garbage := entry.Chunks
newEntry := entry.ShallowClone()
newEntry.Chunks = chunks
newEntry.Remote = proto.Clone(entry.Remote).(*filer_pb.RemoteEntry)
newEntry.Remote.LocalMtime = time.Now().Unix()
// this skips meta data log events
if err := fs.filer.Store.UpdateEntry(context.Background(), newEntry); err != nil {
return nil, err
}
fs.filer.DeleteChunks(garbage)
fs.filer.NotifyUpdateEvent(ctx, entry, newEntry, true, false, nil)
resp.Entry = entry.ToProtoEntry()
return resp, nil
}
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