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server.go
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server.go
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/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you 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 common
import (
"fmt"
"net"
"os"
"strings"
"sync"
"go.uber.org/zap"
"golang.org/x/net/context"
"google.golang.org/grpc"
"github.com/apache/yunikorn-core/pkg/log"
"github.com/apache/yunikorn-scheduler-interface/lib/go/si"
)
// Defines Non blocking GRPC server interfaces
type NonBlockingGRPCServer interface {
// Start services at the endpoint
Start(endpoint string, ss si.SchedulerServer)
// Waits for the service to stop
Wait()
// Stops the service gracefully
Stop()
// Stops the service forcefully
ForceStop()
}
func NewNonBlockingGRPCServer() NonBlockingGRPCServer {
return &nonBlockingGRPCServer{}
}
// NonBlocking server
type nonBlockingGRPCServer struct {
wg sync.WaitGroup
server *grpc.Server
}
func (s *nonBlockingGRPCServer) Start(endpoint string, ss si.SchedulerServer) {
s.wg.Add(1)
go s.serve(endpoint, ss)
}
func (s *nonBlockingGRPCServer) Wait() {
s.wg.Wait()
}
func (s *nonBlockingGRPCServer) Stop() {
s.server.GracefulStop()
}
func (s *nonBlockingGRPCServer) ForceStop() {
s.server.Stop()
}
func ParseEndpoint(ep string) (string, string, error) {
if strings.HasPrefix(strings.ToLower(ep), "unix://") || strings.HasPrefix(strings.ToLower(ep), "tcp://") {
s := strings.SplitN(ep, "://", 2)
if s[1] != "" {
return s[0], s[1], nil
}
}
return "", "", fmt.Errorf("invalid endpoint: %v", ep)
}
// Logging unary interceptor function to log every RPC call
func logGRPC(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
log.Log(log.RPC).Debug("GPRC call",
zap.String("method", info.FullMethod))
log.Log(log.RPC).Debug("GPRC request",
zap.String("request", fmt.Sprintf("%+v", req)))
resp, err := handler(ctx, req)
if err != nil {
log.Log(log.RPC).Debug("GPRC error", zap.Error(err))
} else {
log.Log(log.RPC).Debug("GPRC response",
zap.String("response", fmt.Sprintf("%+v", resp)))
}
return resp, err
}
// Returns unary interceptor that will be used to intercept the execution of a unary RPC on the gRPC server
func withServerUnaryInterceptor() grpc.ServerOption {
return grpc.UnaryInterceptor(logGRPC)
}
func (s *nonBlockingGRPCServer) serve(endpoint string, ss si.SchedulerServer) {
proto, addr, err := ParseEndpoint(endpoint)
if err != nil {
log.Log(log.RPC).Fatal("fatal error", zap.Error(err))
}
if proto == "unix" {
addr = "/" + addr
if err = os.Remove(addr); err != nil && !os.IsNotExist(err) {
log.Log(log.RPC).Fatal("failed to remove unix domain socket",
zap.String("uds", addr),
zap.Error(err))
}
}
var listener net.Listener
listener, err = net.Listen(proto, addr)
if err != nil {
log.Log(log.RPC).Fatal("failed to listen to address",
zap.Error(err))
}
server := grpc.NewServer(withServerUnaryInterceptor())
s.server = server
if ss != nil {
si.RegisterSchedulerServer(server, ss)
}
log.Log(log.RPC).Info("listening for connections",
zap.Stringer("address", listener.Addr()))
if err = server.Serve(listener); err != nil {
log.Log(log.RPC).Fatal("failed to serve", zap.Error(err))
}
}