seaweedfs/weed/filer2/filer_notify_append.go

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package filer2
import (
"context"
"fmt"
"os"
"time"
"github.com/chrislusf/seaweedfs/weed/operation"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
)
func (f *Filer) appendToFile(targetFile string, data []byte) error {
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assignResult, uploadResult, err2 := f.assignAndUpload(data)
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if err2 != nil {
return err2
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}
// find out existing entry
fullpath := util.FullPath(targetFile)
entry, err := f.FindEntry(context.Background(), fullpath)
var offset int64 = 0
if err == filer_pb.ErrNotFound {
entry = &Entry{
FullPath: fullpath,
Attr: Attr{
Crtime: time.Now(),
Mtime: time.Now(),
Mode: os.FileMode(0644),
Uid: OS_UID,
Gid: OS_GID,
},
}
} else {
offset = int64(TotalSize(entry.Chunks))
}
// append to existing chunks
chunk := &filer_pb.FileChunk{
FileId: assignResult.Fid,
Offset: offset,
Size: uint64(uploadResult.Size),
Mtime: time.Now().UnixNano(),
ETag: uploadResult.ETag,
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CipherKey: uploadResult.CipherKey,
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IsGzipped: uploadResult.Gzip > 0,
}
entry.Chunks = append(entry.Chunks, chunk)
// update the entry
err = f.CreateEntry(context.Background(), entry, false)
return err
}
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func (f *Filer) assignAndUpload(data []byte) (*operation.AssignResult, *operation.UploadResult, error) {
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// assign a volume location
assignRequest := &operation.VolumeAssignRequest{
Count: 1,
Collection: f.metaLogCollection,
Replication: f.metaLogReplication,
WritableVolumeCount: 1,
}
assignResult, err := operation.Assign(f.GetMaster(), f.GrpcDialOption, assignRequest)
if err != nil {
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return nil, nil, fmt.Errorf("AssignVolume: %v", err)
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}
if assignResult.Error != "" {
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return nil, nil, fmt.Errorf("AssignVolume error: %v", assignResult.Error)
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}
// upload data
targetUrl := "http://" + assignResult.Url + "/" + assignResult.Fid
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uploadResult, err := operation.UploadData(targetUrl, "", f.Cipher, data, false, "", nil, assignResult.Auth)
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if err != nil {
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return nil, nil, fmt.Errorf("upload data %s: %v", targetUrl, err)
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}
// println("uploaded to", targetUrl)
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return assignResult, uploadResult, nil
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}