97 lines
2.8 KiB
Go
97 lines
2.8 KiB
Go
/*
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* Copyright 2020 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package peer
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import (
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"context"
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"io"
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"net"
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"net/http/httputil"
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"time"
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"github.com/pkg/errors"
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"d7y.io/dragonfly/v2/client/clientutil"
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logger "d7y.io/dragonfly/v2/pkg/dflog"
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)
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type optimizedPieceDownloader struct {
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}
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type cancelCloser struct {
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cancel func()
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closer io.Closer
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}
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func (c *cancelCloser) Close() error {
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err := c.closer.Close()
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c.cancel()
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return err
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}
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func NewOptimizedPieceDownloader(opts ...func(*optimizedPieceDownloader) error) (PieceDownloader, error) {
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pd := &optimizedPieceDownloader{}
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for _, opt := range opts {
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if err := opt(pd); err != nil {
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return nil, err
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}
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}
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return pd, nil
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}
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func (o optimizedPieceDownloader) DownloadPiece(ctx context.Context, request *DownloadPieceRequest) (io.Reader, io.Closer, error) {
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logger.Debugf("download piece, addr: %s, task: %s, peer: %s, piece: %d",
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request.TaskID, request.DstAddr, request.DstPid, request.piece.PieceNum)
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// TODO get from connection pool
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conn, err := net.DialTimeout("tcp", request.DstAddr, 2*time.Second)
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if err != nil {
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panic(err)
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}
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// TODO refactor httputil.NewClientConn
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//nolint
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client := httputil.NewClientConn(conn, nil)
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// add default timeout
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ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
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req := buildDownloadPieceHTTPRequest(ctx, request)
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// write request to tcp conn
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if err = client.Write(req); err != nil {
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cancel()
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return nil, nil, err
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}
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// read response header
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resp, err := client.Read(req)
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if err != nil {
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cancel()
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return nil, nil, err
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}
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if resp.ContentLength <= 0 {
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cancel()
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logger.Errorf("can not get ContentLength, addr: %s, task: %s, peer: %s, piece: %d",
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request.TaskID, request.DstAddr, request.DstPid, request.piece.PieceNum)
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return nil, nil, errors.New("can not get ContentLength")
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}
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conn, buf := client.Hijack()
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if buf.Buffered() > 0 {
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logger.Warnf("buffer size is not 0, addr: %s, task: %s, peer: %s, piece: %d",
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request.TaskID, request.DstAddr, request.DstPid, request.piece.PieceNum)
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return io.LimitReader(clientutil.BufferReader(buf, conn), resp.ContentLength),
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&cancelCloser{cancel: cancel, closer: conn}, nil
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}
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return io.LimitReader(conn, resp.ContentLength), &cancelCloser{cancel: cancel, closer: conn}, nil
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}
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