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grpc.go
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grpc.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2019 Red Hat, Inc.
*
*/
package grpc
import (
"context"
"net"
"os"
"path/filepath"
"time"
"google.golang.org/grpc"
"kubevirt.io/client-go/log"
"kubevirt.io/kubevirt/pkg/util"
)
const (
CONNECT_TIMEOUT_SECONDS = 2
)
func DialSocket(socketPath string) (*grpc.ClientConn, error) {
return DialSocketWithTimeout(socketPath, 0)
}
func DialSocketWithTimeout(socketPath string, timeout int) (*grpc.ClientConn, error) {
options := []grpc.DialOption{
grpc.WithAuthority("localhost"),
grpc.WithInsecure(),
grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
return net.DialTimeout("unix", addr, timeout)
}),
grpc.WithBlock(), // dial sync in order to catch errors early
}
if timeout > 0 {
options = append(options,
grpc.WithTimeout(time.Duration(timeout+CONNECT_TIMEOUT_SECONDS)*time.Second),
)
}
// Combined with the Block option, this context controls how long to wait for establishing the connection.
// The dial timeout used above, controls the overall duration of the connection (including RCP calls).
ctx, cancel := context.WithTimeout(context.Background(), CONNECT_TIMEOUT_SECONDS*time.Second)
defer cancel()
return grpc.DialContext(ctx, socketPath, options...)
}
func CreateSocket(socketPath string) (net.Listener, error) {
os.RemoveAll(socketPath)
err := util.MkdirAllWithNosec(filepath.Dir(socketPath))
if err != nil {
log.Log.Reason(err).Errorf("unable to create directory for unix socket %v", socketPath)
return nil, err
}
socket, err := net.Listen("unix", socketPath)
if err != nil {
log.Log.Reason(err).Errorf("failed to create unix socket %v", socketPath)
return nil, err
}
return socket, nil
}