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aws.go
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aws.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 apmcloudutil
import (
"context"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"go.elastic.co/apm/model"
)
const (
ec2TokenURL = "http://169.254.169.254/latest/api/token"
ec2MetadataURL = "http://169.254.169.254/latest/dynamic/instance-identity/document"
)
// See: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html
func getAWSCloudMetadata(ctx context.Context, client *http.Client, out *model.Cloud) error {
token, err := getAWSToken(ctx, client)
if err != nil {
return err
}
req, err := http.NewRequest("GET", ec2MetadataURL, nil)
if err != nil {
return err
}
if token != "" {
req.Header.Set("X-aws-ec2-metadata-token", token)
}
resp, err := client.Do(req.WithContext(ctx))
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return errors.New(resp.Status)
}
var ec2Metadata struct {
AccountID string `json:"accountId"`
AvailabilityZone string `json:"availabilityZone"`
Region string `json:"region"`
InstanceID string `json:"instanceId"`
InstanceType string `json:"instanceType"`
}
if err := json.NewDecoder(resp.Body).Decode(&ec2Metadata); err != nil {
return err
}
out.Region = ec2Metadata.Region
out.AvailabilityZone = ec2Metadata.AvailabilityZone
if ec2Metadata.InstanceID != "" {
out.Instance = &model.CloudInstance{ID: ec2Metadata.InstanceID}
}
if ec2Metadata.InstanceType != "" {
out.Machine = &model.CloudMachine{Type: ec2Metadata.InstanceType}
}
if ec2Metadata.AccountID != "" {
out.Account = &model.CloudAccount{ID: ec2Metadata.AccountID}
}
return nil
}
func getAWSToken(ctx context.Context, client *http.Client) (string, error) {
req, err := http.NewRequest("PUT", ec2TokenURL, nil)
if err != nil {
return "", err
}
req.Header.Set("X-aws-ec2-metadata-token-ttl-seconds", "300")
resp, err := client.Do(req.WithContext(ctx))
if err != nil {
return "", err
}
defer resp.Body.Close()
token, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(token), nil
}