51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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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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package common
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import (
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"fmt"
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"os/exec"
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"regexp"
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"github.com/GoogleCloudPlatform/gcloud-golang/compute/metadata"
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)
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var gceInternalIpRegexp = regexp.MustCompile(" +ip +\\| +([0-9.:]+) +")
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var gceExternalIpRegexp = regexp.MustCompile("external-ip +\\| +([0-9.:]+) +")
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// Gets the IP of the specified GCE instance.
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func GetGceIp(hostname string) (string, error) {
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if hostname == "localhost" {
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return "127.0.0.1", nil
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}
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out, err := exec.Command("gcutil", "getinstance", hostname).CombinedOutput()
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if err != nil {
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return "", err
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}
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// Use the internal IP within GCE and the external one outside.
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var matches []string
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if metadata.OnGCE() {
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matches = gceInternalIpRegexp.FindStringSubmatch(string(out))
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} else {
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matches = gceExternalIpRegexp.FindStringSubmatch(string(out))
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}
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if len(matches) == 0 {
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return "", fmt.Errorf("failed to find IP from output %q", string(out))
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}
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return matches[1], nil
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}
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