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feature: add client stream writer for Streaming
Signed-off-by: 楚贤 <[email protected]>
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185 changes: 185 additions & 0 deletions
185
dfget/core/downloader/p2p_downloader/client_stream_writer.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| /* | ||
| * Copyright The Dragonfly Authors. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package downloader | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "time" | ||
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| "github.com/dragonflyoss/Dragonfly/dfget/config" | ||
| "github.com/dragonflyoss/Dragonfly/dfget/core/api" | ||
| "github.com/dragonflyoss/Dragonfly/dfget/core/helper" | ||
| "github.com/dragonflyoss/Dragonfly/dfget/types" | ||
| "github.com/dragonflyoss/Dragonfly/pkg/queue" | ||
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| "github.com/sirupsen/logrus" | ||
| ) | ||
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| // ClientWriter writes a file for uploading and a target file. | ||
| type ClientStreamWriter struct { | ||
| // clientQueue maintains a queue of tasks that need to be written to disk. | ||
| // The downloader will put the piece into this queue after it downloaded a piece successfully. | ||
| // And clientWriter will poll values from this queue constantly and write to disk. | ||
| clientQueue queue.Queue | ||
| // finish indicates whether the task written is completed. | ||
| finish chan struct{} | ||
|
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| syncQueue queue.Queue | ||
| // pieceIndex records the number of pieces currently downloaded. | ||
| pieceIndex int | ||
| // result records whether the write operation was successful. | ||
| result bool | ||
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| // p2pPattern records whether the pattern equals "p2p". | ||
| p2pPattern bool | ||
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| // pipeWriter is the writer half of a pipe, all piece data will be wrote into pipeWriter | ||
| pipeWriter *io.PipeWriter | ||
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| // pipeReader is the read half of a pipe | ||
| pipeReader *io.PipeReader | ||
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| cache map[int]*Piece | ||
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| // api holds an instance of SupernodeAPI to interact with supernode. | ||
| api api.SupernodeAPI | ||
| cfg *config.Config | ||
| } | ||
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| // NewClientStreamWriter creates and initialize a ClientStreamWriter instance. | ||
| func NewClientStreamWriter(clientQueue queue.Queue, api api.SupernodeAPI, cfg *config.Config) (*ClientStreamWriter, error) { | ||
| pr, pw := io.Pipe() | ||
| clientWriter := &ClientStreamWriter{ | ||
| clientQueue: clientQueue, | ||
| pipeReader: pr, | ||
| pipeWriter: pw, | ||
| api: api, | ||
| cfg: cfg, | ||
| } | ||
| if err := clientWriter.init(); err != nil { | ||
| return nil, err | ||
| } | ||
| return clientWriter, nil | ||
| } | ||
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| func (csw *ClientStreamWriter) init() (err error) { | ||
| csw.p2pPattern = helper.IsP2P(csw.cfg.Pattern) | ||
| csw.result = true | ||
| csw.finish = make(chan struct{}) | ||
| return | ||
| } | ||
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| // Run starts writing pipe. | ||
| func (csw *ClientStreamWriter) Run(ctx context.Context) { | ||
| for { | ||
| item := csw.clientQueue.Poll() | ||
| state, ok := item.(string) | ||
| if ok && state == last { | ||
| break | ||
| } | ||
| if ok && state == reset { | ||
| // stream could not reset, just return error | ||
| // | ||
| csw.pipeWriter.CloseWithError(fmt.Errorf("stream writer not support reset")) | ||
| continue | ||
| } | ||
| if !csw.result { | ||
| continue | ||
| } | ||
|
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| piece, ok := item.(*Piece) | ||
| if !ok { | ||
| continue | ||
| } | ||
| if err := csw.write(piece); err != nil { | ||
| logrus.Errorf("write item:%s error:%v", piece, err) | ||
| csw.cfg.BackSourceReason = config.BackSourceReasonWriteError | ||
| csw.result = false | ||
| } | ||
| } | ||
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| csw.pipeWriter.Close() | ||
| close(csw.finish) | ||
| } | ||
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| // Wait for Run whether is finished. | ||
| func (csw *ClientStreamWriter) Wait() { | ||
| if csw.finish != nil { | ||
| <-csw.finish | ||
| } | ||
| } | ||
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| func (csw *ClientStreamWriter) write(piece *Piece) error { | ||
| startTime := time.Now() | ||
| // TODO csw.p2pPattern | ||
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| err := csw.writePieceToPipe(piece) | ||
| if err == nil { | ||
| go csw.sendSuccessPiece(piece, time.Since(startTime)) | ||
| } | ||
| return err | ||
| } | ||
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| func (csw *ClientStreamWriter) writePieceToPipe(p *Piece) error { | ||
| for { | ||
| // must write piece by order | ||
| // when received PieceNum is great then pieceIndex, cache it | ||
| if p.PieceNum != csw.pieceIndex { | ||
| if p.PieceNum < csw.pieceIndex { | ||
| return fmt.Errorf("piece number should great than %d", csw.pieceIndex) | ||
| } | ||
| csw.cache[p.PieceNum] = p | ||
| break | ||
| } | ||
|
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| _, err := io.Copy(csw.pipeWriter, p.RawContent()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| csw.pieceIndex++ | ||
| // next piece may be already in cache, check it | ||
| next, ok := csw.cache[csw.pieceIndex] | ||
| if ok { | ||
| p = next | ||
| continue | ||
| } | ||
| break | ||
| } | ||
|
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| return nil | ||
| } | ||
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| func (csw *ClientStreamWriter) sendSuccessPiece(piece *Piece, cost time.Duration) { | ||
| csw.api.ReportPiece(piece.SuperNode, &types.ReportPieceRequest{ | ||
| TaskID: piece.TaskID, | ||
| Cid: csw.cfg.RV.Cid, | ||
| DstCid: piece.DstCid, | ||
| PieceRange: piece.Range, | ||
| }) | ||
| if cost.Seconds() > 2.0 { | ||
| logrus.Infof( | ||
| "async writer and report suc from dst:%s... cost:%.3f for range:%s", | ||
| piece.DstCid[:25], cost.Seconds(), piece.Range) | ||
| } | ||
| } | ||
|
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| func (csw *ClientStreamWriter) Read(p []byte) (n int, err error) { | ||
| return csw.pipeReader.Read(p) | ||
| } |
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