mirror of
https://github.com/rocky-linux/peridot.git
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79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
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/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package service manages connections between the VM application and the ALTS
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// handshaker service.
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package service
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import (
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"sync"
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grpc "google.golang.org/grpc"
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"google.golang.org/grpc/credentials/insecure"
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)
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var (
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// mu guards hsConnMap and hsDialer.
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mu sync.Mutex
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// hsConn represents a mapping from a hypervisor handshaker service address
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// to a corresponding connection to a hypervisor handshaker service
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// instance.
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hsConnMap = make(map[string]*grpc.ClientConn)
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// hsDialer will be reassigned in tests.
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hsDialer = grpc.Dial
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)
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// Dial dials the handshake service in the hypervisor. If a connection has
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// already been established, this function returns it. Otherwise, a new
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// connection is created.
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func Dial(hsAddress string) (*grpc.ClientConn, error) {
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mu.Lock()
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defer mu.Unlock()
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hsConn, ok := hsConnMap[hsAddress]
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if !ok {
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// Create a new connection to the handshaker service. Note that
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// this connection stays open until the application is closed.
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var err error
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hsConn, err = hsDialer(hsAddress, grpc.WithTransportCredentials(insecure.NewCredentials()))
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if err != nil {
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return nil, err
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}
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hsConnMap[hsAddress] = hsConn
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}
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return hsConn, nil
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}
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// CloseForTesting closes all open connections to the handshaker service.
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//
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// For testing purposes only.
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func CloseForTesting() error {
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for _, hsConn := range hsConnMap {
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if hsConn == nil {
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continue
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}
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if err := hsConn.Close(); err != nil {
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return err
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}
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}
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// Reset the connection map.
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hsConnMap = make(map[string]*grpc.ClientConn)
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return nil
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}
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