feat: seed max concurrent

Signed-off-by: Jim Ma <majinjing3@gmail.com>

Author: jim3ma

client/daemon/daemon.go

@@ -360,7 +360,8 @@ func New(opt *config.DaemonOption, d dfpath.Dfpath) (Daemon, error) {
 	}
 
 	rpcManager, err := rpcserver.New(host, peerTaskManager, storageManager, peerExchangeRPC, schedulerClient,
-		opt.Download.RecursiveConcurrent.GoroutineCount, opt.Download.CacheRecursiveMetadata, downloadServerOption, peerServerOption)
+		opt.Download.RecursiveConcurrent.GoroutineCount, opt.Download.SeedConcurrent,
+		opt.Download.CacheRecursiveMetadata, downloadServerOption, peerServerOption)
 	if err != nil {
 		return nil, err
 	}

client/daemon/rpcserver/rpcserver.go

@@ -103,7 +103,8 @@ func init() {
 }
 
 func New(peerHost *schedulerv1.PeerHost, peerTaskManager peer.TaskManager,
-	storageManager storage.Manager, peerExchanger pex.PeerExchangeRPC, schedulerClient schedulerclient.V1, recursiveConcurrent int, cacheRecursiveMetadata time.Duration,
+	storageManager storage.Manager, peerExchanger pex.PeerExchangeRPC, schedulerClient schedulerclient.V1,
+	recursiveConcurrent int, seedConcurrent int64, cacheRecursiveMetadata time.Duration,
 	downloadOpts []grpc.ServerOption, peerOpts []grpc.ServerOption) (Server, error) {
 	s := &server{
 		KeepAlive:       util.NewKeepAlive("rpc server"),
@@ -120,7 +121,9 @@ func New(peerHost *schedulerv1.PeerHost, peerTaskManager peer.TaskManager,
 	}
 
 	sd := &seeder{
-		server: s,
+		server:        s,
+		maxConcurrent: seedConcurrent,
+		concurrent:    atomic.NewInt64(0),
 	}
 
 	// set not serving by default

client/daemon/rpcserver/rpcserver_test.go

@@ -76,7 +76,7 @@ func TestServer_New(t *testing.T) {
 			mockSchedulerClient := schedulerclientmocks.NewMockV1(ctrl)
 			var mockdownloadOpts []grpc.ServerOption
 			var mockpeerOpts []grpc.ServerOption
-			_, err := New(mockpeerHost, mockpeerTaskManager, mockStorageManger, nil, mockSchedulerClient, 16, 0, mockdownloadOpts, mockpeerOpts)
+			_, err := New(mockpeerHost, mockpeerTaskManager, mockStorageManger, nil, mockSchedulerClient, 16, 0, 0, mockdownloadOpts, mockpeerOpts)
 			tc.expect(t, err)
 		})
 	}

client/daemon/rpcserver/seeder.go

@@ -22,6 +22,7 @@ import (
 	"math"
 	"time"
 
+	"go.uber.org/atomic"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 
@@ -39,7 +40,9 @@ import (
 )
 
 type seeder struct {
-	server *server
+	maxConcurrent int64
+	concurrent    *atomic.Int64
+	server        *server
 }
 
 func (s *seeder) GetPieceTasks(ctx context.Context, request *commonv1.PieceTaskRequest) (*commonv1.PiecePacket, error) {
@@ -55,6 +58,16 @@ func (s *seeder) ObtainSeeds(seedRequest *cdnsystemv1.SeedRequest, seedsServer c
 		printAuthInfo(seedsServer.Context())
 	}
 
+	if s.maxConcurrent > 0 {
+		if s.concurrent.Inc() > s.maxConcurrent {
+			s.concurrent.Dec()
+			logger.Infof("seed peer is busying, return ResourceExhausted")
+			return status.Errorf(codes.ResourceExhausted, "seed peer is busying, limit is %d", s.maxConcurrent)
+		}
+
+		defer s.concurrent.Dec()
+	}
+
 	metrics.SeedPeerConcurrentDownloadGauge.Inc()
 	defer metrics.SeedPeerConcurrentDownloadGauge.Dec()
 	metrics.SeedPeerDownloadCount.Add(1)

client/daemon/rpcserver/seeder_test.go

@@ -19,6 +19,9 @@ package rpcserver
 import (
 	"context"
 	"fmt"
+	"go.uber.org/atomic"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 	"io"
 	"net"
 	"sync"
@@ -396,3 +399,18 @@ func setupSeederServerAndClient(t *testing.T, srv *server, sd *seeder, assert *t
 
 	return port, client
 }
+
+func Test_ObtainSeedsResourceExhausted(t *testing.T) {
+	sd := &seeder{
+		maxConcurrent: 10,
+		concurrent:    atomic.NewInt64(10),
+	}
+
+	assert := testifyassert.New(t)
+
+	err := sd.ObtainSeeds(nil, nil)
+	assert.Error(err, "ObtainSeeds should return error")
+	st, ok := status.FromError(err)
+	assert.True(ok, "error should be status")
+	assert.Equal(codes.ResourceExhausted, st.Code())
+}