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