128 lines
3.1 KiB
Go
128 lines
3.1 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 server
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import (
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"context"
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"sync"
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"d7y.io/dragonfly/v2/internal/dferrors"
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logger "d7y.io/dragonfly/v2/internal/dflog"
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"d7y.io/dragonfly/v2/pkg/rpc"
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"d7y.io/dragonfly/v2/pkg/rpc/base"
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"d7y.io/dragonfly/v2/pkg/rpc/dfdaemon"
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"d7y.io/dragonfly/v2/pkg/safe"
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"github.com/golang/protobuf/ptypes/empty"
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"google.golang.org/grpc"
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"google.golang.org/grpc/peer"
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)
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func init() {
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// set register with server implementation.
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rpc.SetRegister(func(s *grpc.Server, impl interface{}) {
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dfdaemon.RegisterDaemonServer(s, &proxy{server: impl.(DaemonServer)})
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})
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}
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type proxy struct {
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server DaemonServer
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dfdaemon.UnimplementedDaemonServer
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}
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// see dfdaemon.DaemonServer
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type DaemonServer interface {
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Download(context.Context, *dfdaemon.DownRequest, chan<- *dfdaemon.DownResult) error
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GetPieceTasks(context.Context, *base.PieceTaskRequest) (*base.PiecePacket, error)
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CheckHealth(context.Context) error
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}
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func (p *proxy) Download(req *dfdaemon.DownRequest, stream dfdaemon.Daemon_DownloadServer) (err error) {
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ctx, cancel := context.WithCancel(stream.Context())
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defer cancel()
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peerAddr := "unknown"
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if pe, ok := peer.FromContext(ctx); ok {
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peerAddr = pe.Addr.String()
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}
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logger.Infof("trigger download for url:%s,from:%s,uuid:%s", req.Url, peerAddr, req.Uuid)
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errChan := make(chan error, 10)
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drc := make(chan *dfdaemon.DownResult, 4)
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once := new(sync.Once)
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closeDrc := func() {
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once.Do(func() {
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close(drc)
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})
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}
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defer closeDrc()
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go call(ctx, drc, p, req, errChan)
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go send(drc, closeDrc, stream, errChan)
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if err = <-errChan; dferrors.IsEndOfStream(err) {
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err = nil
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}
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return
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}
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func (p *proxy) GetPieceTasks(ctx context.Context, ptr *base.PieceTaskRequest) (*base.PiecePacket, error) {
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return p.server.GetPieceTasks(ctx, ptr)
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}
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func (p *proxy) CheckHealth(ctx context.Context, req *empty.Empty) (*empty.Empty, error) {
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_ = req
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return new(empty.Empty), p.server.CheckHealth(ctx)
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}
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func send(drc chan *dfdaemon.DownResult, closeDrc func(), stream dfdaemon.Daemon_DownloadServer, errChan chan error) {
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err := safe.Call(func() {
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defer closeDrc()
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for v := range drc {
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if err := stream.Send(v); err != nil {
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errChan <- err
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return
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}
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if v.Done {
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break
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}
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}
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errChan <- dferrors.ErrEndOfStream
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})
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if err != nil {
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errChan <- err
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}
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}
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func call(ctx context.Context, drc chan *dfdaemon.DownResult, p *proxy, req *dfdaemon.DownRequest, errChan chan error) {
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err := safe.Call(func() {
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if err := p.server.Download(ctx, req, drc); err != nil {
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errChan <- err
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}
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})
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if err != nil {
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errChan <- err
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}
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}
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