73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
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package fingerprint
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import (
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"io/ioutil"
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"log"
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"net/http"
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"net/url"
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"os"
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"strings"
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"time"
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"github.com/hashicorp/nomad/client/config"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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// EnvAWSFingerprint is used to fingerprint the CPU
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type EnvAWSFingerprint struct {
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logger *log.Logger
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}
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// NewEnvAWSFingerprint is used to create a CPU fingerprint
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func NewEnvAWSFingerprint(logger *log.Logger) Fingerprint {
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f := &EnvAWSFingerprint{logger: logger}
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return f
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}
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func (f *EnvAWSFingerprint) Fingerprint(cfg *config.Config, node *structs.Node) (bool, error) {
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metadataURL := os.Getenv("AWS_ENV_URL")
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if metadataURL == "" {
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metadataURL = "http://169.254.169.254/latest/meta-data/"
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}
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// assume 2 seconds is enough time for inside AWS network
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client := &http.Client{
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Timeout: 2 * time.Second,
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}
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keys := []string{
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"ami-id",
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"hostname",
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"instance-id",
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"instance-type",
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"local-hostname",
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"local-ipv4",
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"public-hostname",
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"public-ipv4",
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"placement/availability-zone",
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}
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for _, k := range keys {
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res, err := client.Get(metadataURL + k)
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if err != nil {
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// if it's a URL error, assume we're not in an AWS environment
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// TODO: better way to detect AWS? Check xen virtualization?
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if _, ok := err.(*url.Error); ok {
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return false, nil
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}
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// not sure what other errors it would return
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return false, err
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}
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resp, err := ioutil.ReadAll(res.Body)
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res.Body.Close()
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if err != nil {
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log.Fatal(err)
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}
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// assume we want blank entries
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key := strings.Replace(k, "/", ".", -1)
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node.Attributes["env.aws."+key] = strings.Trim(string(resp), "\n")
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}
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return true, nil
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}
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