func getGceInstanceID() info.InstanceID {
instanceID, err := metadata.Get("instance/id")
if err != nil {
return info.UnknownInstance
}
return info.InstanceID(info.InstanceType(instanceID))
}
func (cs computeSource) Token() (*oauth2.Token, error) {
if !metadata.OnGCE() {
return nil, errors.New("oauth2/google: can't get a token from the metadata service; not running on GCE")
}
acct := cs.account
if acct == "" {
acct = "default"
}
tokenJSON, err := metadata.Get("instance/service-accounts/" + acct + "/token")
if err != nil {
return nil, err
}
var res struct {
AccessToken string `json:"access_token"`
ExpiresInSec int `json:"expires_in"`
TokenType string `json:"token_type"`
}
err = json.NewDecoder(strings.NewReader(tokenJSON)).Decode(&res)
if err != nil {
return nil, fmt.Errorf("oauth2/google: invalid token JSON from metadata: %v", err)
}
if res.ExpiresInSec == 0 || res.AccessToken == "" {
return nil, fmt.Errorf("oauth2/google: incomplete token received from metadata")
}
return &oauth2.Token{
AccessToken: res.AccessToken,
TokenType: res.TokenType,
Expiry: time.Now().Add(time.Duration(res.ExpiresInSec) * time.Second),
}, nil
}
func getGceInstanceType() info.InstanceType {
machineType, err := metadata.Get("instance/machine-type")
if err != nil {
return info.UnknownInstance
}
responseParts := strings.Split(machineType, "/") // Extract the instance name from the machine type.
return info.InstanceType(responseParts[len(responseParts)-1])
}