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/*
*
* Copyright 2021 gRPC 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 googlecloud contains internal helpful functions for google cloud.
package googlecloud
import (
"runtime"
"strings"
"sync"
"google.golang.org/grpc/grpclog"
internalgrpclog "google.golang.org/grpc/internal/grpclog"
)
const logPrefix = "[googlecloud]"
var (
vmOnGCEOnce sync.Once
vmOnGCE bool
logger = internalgrpclog.NewPrefixLogger(grpclog.Component("googlecloud"), logPrefix)
)
// OnGCE returns whether the client is running on GCE.
//
// It provides similar functionality as metadata.OnGCE from the cloud library
// package. We keep this to avoid depending on the cloud library module.
func OnGCE() bool {
vmOnGCEOnce.Do(func() {
mf, err := manufacturer()
if err != nil {
logger.Infof("failed to read manufacturer, setting onGCE=false: %v")
return
}
vmOnGCE = isRunningOnGCE(mf, runtime.GOOS)
})
return vmOnGCE
}
// isRunningOnGCE checks whether the local system, without doing a network request, is
// running on GCP.
func isRunningOnGCE(manufacturer []byte, goos string) bool {
name := string(manufacturer)
switch goos {
case "linux":
name = strings.TrimSpace(name)
return name == "Google" || name == "Google Compute Engine"
case "windows":
name = strings.Replace(name, " ", "", -1)
name = strings.Replace(name, "\n", "", -1)
name = strings.Replace(name, "\r", "", -1)
return name == "Google"
default:
return false
}
}
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