/
server.go
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/
server.go
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/* Copyright 2020 The FedLearner Authors. All Rights Reserved.
*
* 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"
"fmt"
"net"
"github.com/golang/protobuf/ptypes/empty"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/reflection"
"google.golang.org/grpc/status"
"k8s.io/klog"
"github.com/bytedance/fedlearner/deploy/kubernetes_operator/pkg/operator"
pb "github.com/bytedance/fedlearner/deploy/kubernetes_operator/proto"
)
type PairHandler struct {
handler operator.AppEventHandler
}
func (ph *PairHandler) Ping(_ context.Context, _ *empty.Empty) (*pb.Status, error) {
klog.Infof("Ping received")
return &pb.Status{
Code: int32(codes.OK),
ErrorMessage: "Pong",
}, nil
}
func (ph *PairHandler) Register(ctx context.Context, request *pb.RegisterRequest) (*pb.Status, error) {
name := request.AppId
role := request.Role
klog.Infof("Register received, name = %v, role = %v", name, role)
if operator.IsLeader(role) {
msg := fmt.Sprintf("Register is only accepted from followers, name = %v, role = %v", name, role)
return makeInvalidArgumentStatus(msg)
}
replicas := make(map[string][]string)
for _, pair := range request.Pairs {
pairCopy := *pair
if len(pairCopy.LeaderIds) > 0 {
message := fmt.Sprintf("Register should only send FollowerIds, name = %v, replicaType = %v", name, pairCopy.Type)
return makeInvalidArgumentStatus(message)
}
replicas[pairCopy.Type] = pairCopy.FollowerIds
}
return ph.handler.RegisterHandler(ctx, name, role, replicas)
}
func (ph *PairHandler) Pair(ctx context.Context, request *pb.PairRequest) (*pb.Status, error) {
name := request.AppId
klog.Infof("Pair received, name = %v, pairs = %v", name, request.Pairs)
leaderReplicas := make(map[string][]string)
followerReplicas := make(map[string][]string)
for _, pair := range request.Pairs {
pairCopy := *pair
if len(pair.LeaderIds) != len(pair.FollowerIds) {
message := fmt.Sprintf(
"Pair the length of leader and follower doesn't match, name = %v, replicaType = %v, len(leader) = %v, len(follower) = %v",
name,
pairCopy.Type,
len(pair.LeaderIds),
len(pair.FollowerIds),
)
return makeInvalidArgumentStatus(message)
}
leaderReplicas[pairCopy.Type] = pairCopy.LeaderIds
followerReplicas[pairCopy.Type] = pairCopy.FollowerIds
}
return ph.handler.PairHandler(ctx, name, leaderReplicas, followerReplicas)
}
func (ph *PairHandler) Finish(ctx context.Context, request *pb.FinishRequest) (*pb.Status, error) {
name := request.AppId
klog.Infof("Finish received, name = %v, role = %v", name, request.Role)
return ph.handler.FinishHandler(ctx, name)
}
func (ph *PairHandler) ShutDown(ctx context.Context, request *pb.ShutDownRequest) (*pb.Status, error) {
name := request.AppId
klog.Infof("ShutDown received, name = %v, role = %v", name, request.Role)
return ph.handler.ShutdownHandler(ctx, name)
}
func ServeGrpc(host, port string, handler operator.AppEventHandler) {
lis, err := net.Listen("tcp", fmt.Sprintf("%s:%s", host, port))
if err != nil {
klog.Fatalf("failed to listen: %v", err)
}
grpcServer := grpc.NewServer()
pb.RegisterPairingServiceServer(grpcServer, &PairHandler{handler: handler})
reflection.Register(grpcServer)
if err := grpcServer.Serve(lis); err != nil {
klog.Fatalf("failed to serve grpc service, err = %v", err)
}
}
func makeInvalidArgumentStatus(msg string) (*pb.Status, error) {
return &pb.Status{
Code: int32(codes.InvalidArgument),
ErrorMessage: msg,
}, status.Error(codes.InvalidArgument, msg)
}