/* Copyright 2017 The Kubernetes 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 vitastor import ( "fmt" "net" "os" "strings" "sync" "github.com/golang/glog" "golang.org/x/net/context" "google.golang.org/grpc" "github.com/container-storage-interface/spec/lib/go/csi" "github.com/kubernetes-csi/csi-lib-utils/protosanitizer" ) // Defines Non blocking GRPC server interfaces type NonBlockingGRPCServer interface { // Start services at the endpoint Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) // 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, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) { s.wg.Add(1) go s.serve(endpoint, ids, cs, ns) return } func (s *nonBlockingGRPCServer) Wait() { s.wg.Wait() } func (s *nonBlockingGRPCServer) Stop() { s.server.GracefulStop() } func (s *nonBlockingGRPCServer) ForceStop() { s.server.Stop() } func (s *nonBlockingGRPCServer) serve(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) { proto, addr, err := ParseEndpoint(endpoint) if err != nil { glog.Fatal(err.Error()) } if proto == "unix" { addr = "/" + addr if err := os.Remove(addr); err != nil && !os.IsNotExist(err) { glog.Fatalf("Failed to remove %s, error: %s", addr, err.Error()) } } listener, err := net.Listen(proto, addr) if err != nil { glog.Fatalf("Failed to listen: %v", err) } opts := []grpc.ServerOption{ grpc.UnaryInterceptor(logGRPC), } server := grpc.NewServer(opts...) s.server = server if ids != nil { csi.RegisterIdentityServer(server, ids) } if cs != nil { csi.RegisterControllerServer(server, cs) } if ns != nil { csi.RegisterNodeServer(server, ns) } glog.Infof("Listening for connections on address: %#v", listener.Addr()) server.Serve(listener) } 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) } func logGRPC(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) { glog.V(3).Infof("GRPC call: %s", info.FullMethod) glog.V(5).Infof("GRPC request: %s", protosanitizer.StripSecrets(req)) resp, err := handler(ctx, req) if err != nil { glog.Errorf("GRPC error: %v", err) } else { glog.V(5).Infof("GRPC response: %s", protosanitizer.StripSecrets(resp)) } return resp, err }