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server.go
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server.go
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/*
* Copyright 2020 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.
*/
package server
import (
"context"
"sync"
"d7y.io/dragonfly/v2/internal/dferrors"
logger "d7y.io/dragonfly/v2/internal/dflog"
"d7y.io/dragonfly/v2/pkg/rpc"
"d7y.io/dragonfly/v2/pkg/rpc/base"
"d7y.io/dragonfly/v2/pkg/rpc/dfdaemon"
"d7y.io/dragonfly/v2/pkg/safe"
"github.com/golang/protobuf/ptypes/empty"
"google.golang.org/grpc"
"google.golang.org/grpc/peer"
)
func init() {
// set register with server implementation.
rpc.SetRegister(func(s *grpc.Server, impl interface{}) {
dfdaemon.RegisterDaemonServer(s, &proxy{server: impl.(DaemonServer)})
})
}
type proxy struct {
server DaemonServer
dfdaemon.UnimplementedDaemonServer
}
// see dfdaemon.DaemonServer
type DaemonServer interface {
Download(context.Context, *dfdaemon.DownRequest, chan<- *dfdaemon.DownResult) error
GetPieceTasks(context.Context, *base.PieceTaskRequest) (*base.PiecePacket, error)
CheckHealth(context.Context) error
}
func (p *proxy) Download(req *dfdaemon.DownRequest, stream dfdaemon.Daemon_DownloadServer) (err error) {
ctx, cancel := context.WithCancel(stream.Context())
defer cancel()
peerAddr := "unknown"
if pe, ok := peer.FromContext(ctx); ok {
peerAddr = pe.Addr.String()
}
logger.Infof("trigger download for url: %s, from: %s, uuid: %s", req.Url, peerAddr, req.Uuid)
errChan := make(chan error, 10)
drc := make(chan *dfdaemon.DownResult, 4)
once := new(sync.Once)
closeDrc := func() {
once.Do(func() {
close(drc)
})
}
defer closeDrc()
go call(ctx, drc, p, req, errChan)
go send(drc, closeDrc, stream, errChan)
if err = <-errChan; dferrors.IsEndOfStream(err) {
err = nil
}
return
}
func (p *proxy) GetPieceTasks(ctx context.Context, ptr *base.PieceTaskRequest) (*base.PiecePacket, error) {
return p.server.GetPieceTasks(ctx, ptr)
}
func (p *proxy) CheckHealth(ctx context.Context, req *empty.Empty) (*empty.Empty, error) {
_ = req
return new(empty.Empty), p.server.CheckHealth(ctx)
}
func send(drc chan *dfdaemon.DownResult, closeDrc func(), stream dfdaemon.Daemon_DownloadServer, errChan chan error) {
err := safe.Call(func() {
defer closeDrc()
for v := range drc {
if err := stream.Send(v); err != nil {
errChan <- err
return
}
if v.Done {
break
}
}
errChan <- dferrors.ErrEndOfStream
})
if err != nil {
errChan <- err
}
}
func call(ctx context.Context, drc chan *dfdaemon.DownResult, p *proxy, req *dfdaemon.DownRequest, errChan chan error) {
err := safe.Call(func() {
if err := p.server.Download(ctx, req, drc); err != nil {
errChan <- err
}
})
if err != nil {
errChan <- err
}
}