| // Copyright Istio Authors |
| // |
| // Licensed 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 platform |
| |
| import ( |
| "strings" |
| "time" |
| ) |
| |
| import ( |
| core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3" |
| "istio.io/pkg/log" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pkg/http" |
| ) |
| |
| const ( |
| AWSRegion = "aws_region" |
| AWSAvailabilityZone = "aws_availability_zone" |
| AWSInstanceID = "aws_instance_id" |
| ) |
| |
| var ( |
| awsMetadataIPv4URL = "http://169.254.169.254/latest/meta-data" |
| awsMetadataIPv6URL = "http://[fd00:ec2::254]/latest/meta-data" |
| ) |
| |
| // Approach derived from the following: |
| // https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/identify_ec2_instances.html |
| // https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html |
| |
| // IsAWS returns whether or not the platform for bootstrapping is Amazon Web Services. |
| func IsAWS(ipv6 bool) bool { |
| info, err := getAWSInfo("iam/info", ipv6) |
| return err == nil && strings.Contains(info, "arn:aws:iam") |
| } |
| |
| type awsEnv struct { |
| region string |
| availabilityzone string |
| instanceID string |
| } |
| |
| // NewAWS returns a platform environment customized for AWS. |
| // Metadata returned by the AWS Environment is taken link-local address running on each node. |
| func NewAWS(ipv6 bool) Environment { |
| return &awsEnv{ |
| region: getRegion(ipv6), |
| availabilityzone: getAvailabilityZone(ipv6), |
| instanceID: getInstanceID(ipv6), |
| } |
| } |
| |
| func (a *awsEnv) Metadata() map[string]string { |
| md := map[string]string{} |
| if len(a.availabilityzone) > 0 { |
| md[AWSAvailabilityZone] = a.availabilityzone |
| } |
| if len(a.region) > 0 { |
| md[AWSRegion] = a.region |
| } |
| if len(a.instanceID) > 0 { |
| md[AWSInstanceID] = a.instanceID |
| } |
| return md |
| } |
| |
| func (a *awsEnv) Locality() *core.Locality { |
| return &core.Locality{ |
| Zone: a.availabilityzone, |
| Region: a.region, |
| } |
| } |
| |
| func (a *awsEnv) Labels() map[string]string { |
| return map[string]string{} |
| } |
| |
| func (a *awsEnv) IsKubernetes() bool { |
| return true |
| } |
| |
| func getAWSInfo(path string, ipv6 bool) (string, error) { |
| url := awsMetadataIPv4URL + "/" + path |
| if ipv6 { |
| url = awsMetadataIPv6URL + "/" + path |
| } |
| |
| resp, err := http.DoHTTPGetWithTimeout(url, time.Millisecond*100) |
| if err != nil { |
| log.Debugf("error in getting aws info for %s : %v", path, err) |
| return "", err |
| } |
| return resp.String(), nil |
| } |
| |
| // getRegion returns the Region that the instance is running in. |
| func getRegion(ipv6 bool) string { |
| region, _ := getAWSInfo("placement/region", ipv6) |
| return region |
| } |
| |
| // getAvailabilityZone returns the AvailabilityZone that the instance is running in. |
| func getAvailabilityZone(ipv6 bool) string { |
| az, _ := getAWSInfo("placement/availability-zone", ipv6) |
| return az |
| } |
| |
| func getInstanceID(ipv6 bool) string { |
| instance, _ := getAWSInfo("instance-id", ipv6) |
| return instance |
| } |