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env_aws.go
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env_aws.go
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package fingerprint
import (
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"regexp"
"strings"
"time"
"github.com/hashicorp/nomad/client/config"
"github.com/hashicorp/nomad/nomad/structs"
)
// map of instance type to approximate speed, in Mbits/s
// http://serverfault.com/questions/324883/aws-bandwidth-and-content-delivery/326797#326797
// which itself cites these sources:
// - http://blog.rightscale.com/2007/10/28/network-performance-within-amazon-ec2-and-to-amazon-s3/
// - http://www.soc.napier.ac.uk/~bill/chris_p.pdf
//
// This data is meant for a loose approximation
var ec2InstanceSpeedMap = map[string]int{
"m4.large": 80,
"m3.medium": 80,
"m3.large": 80,
"c4.large": 80,
"c3.large": 80,
"c3.xlarge": 80,
"r3.large": 80,
"r3.xlarge": 80,
"i2.xlarge": 80,
"d2.xlarge": 80,
"t2.micro": 16,
"t2.small": 16,
"t2.medium": 16,
"t2.large": 16,
"m4.xlarge": 760,
"m4.2xlarge": 760,
"m4.4xlarge": 760,
"m3.xlarge": 760,
"m3.2xlarge": 760,
"c4.xlarge": 760,
"c4.2xlarge": 760,
"c4.4xlarge": 760,
"c3.2xlarge": 760,
"c3.4xlarge": 760,
"g2.2xlarge": 760,
"r3.2xlarge": 760,
"r3.4xlarge": 760,
"i2.2xlarge": 760,
"i2.4xlarge": 760,
"d2.2xlarge": 760,
"d2.4xlarge": 760,
"m4.10xlarge": 10000,
"c4.8xlarge": 10000,
"c3.8xlarge": 10000,
"g2.8xlarge": 10000,
"r3.8xlarge": 10000,
"i2.8xlarge": 10000,
"d2.8xlarge": 10000,
}
// EnvAWSFingerprint is used to fingerprint the CPU
type EnvAWSFingerprint struct {
logger *log.Logger
}
// NewEnvAWSFingerprint is used to create a CPU fingerprint
func NewEnvAWSFingerprint(logger *log.Logger) Fingerprint {
f := &EnvAWSFingerprint{logger: logger}
return f
}
func (f *EnvAWSFingerprint) Fingerprint(cfg *config.Config, node *structs.Node) (bool, error) {
if !isAWS() {
return false, nil
}
// newNetwork is populated and addded to the Nodes resources
newNetwork := &structs.NetworkResource{
Device: "eth0",
}
if node.Links == nil {
node.Links = make(map[string]string)
}
metadataURL := os.Getenv("AWS_ENV_URL")
if metadataURL == "" {
metadataURL = "http://169.254.169.254/latest/meta-data/"
}
// assume 2 seconds is enough time for inside AWS network
client := &http.Client{
Timeout: 2 * time.Second,
}
keys := []string{
"ami-id",
"hostname",
"instance-id",
"instance-type",
"local-hostname",
"local-ipv4",
"public-hostname",
"public-ipv4",
"placement/availability-zone",
}
for _, k := range keys {
res, err := client.Get(metadataURL + k)
if err != nil {
// if it's a URL error, assume we're not in an AWS environment
// TODO: better way to detect AWS? Check xen virtualization?
if _, ok := err.(*url.Error); ok {
return false, nil
}
// not sure what other errors it would return
return false, err
}
resp, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
f.logger.Printf("[ERR]: fingerprint.env_aws: Error reading response body for AWS %s", k)
}
// assume we want blank entries
key := strings.Replace(k, "/", ".", -1)
node.Attributes["platform.aws."+key] = strings.Trim(string(resp), "\n")
}
// copy over network specific information
if node.Attributes["platform.aws.local-ipv4"] != "" {
node.Attributes["network.ip-address"] = node.Attributes["platform.aws.local-ipv4"]
newNetwork.IP = node.Attributes["platform.aws.local-ipv4"]
newNetwork.CIDR = newNetwork.IP + "/32"
}
// find LinkSpeed from lookup
if throughput := f.linkSpeed(); throughput > 0 {
newNetwork.MBits = throughput
}
if node.Resources == nil {
node.Resources = &structs.Resources{}
}
node.Resources.Networks = append(node.Resources.Networks, newNetwork)
// populate Node Network Resources
// populate Links
node.Links["aws.ec2"] = node.Attributes["platform.aws.placement.availability-zone"] + "." + node.Attributes["platform.aws.instance-id"]
return true, nil
}
func isAWS() bool {
// Read the internal metadata URL from the environment, allowing test files to
// provide their own
metadataURL := os.Getenv("AWS_ENV_URL")
if metadataURL == "" {
metadataURL = "http://169.254.169.254/latest/meta-data/"
}
// assume 2 seconds is enough time for inside AWS network
client := &http.Client{
Timeout: 2 * time.Second,
}
// Query the metadata url for the ami-id, to veryify we're on AWS
resp, err := client.Get(metadataURL + "ami-id")
if err != nil {
log.Printf("[ERR] fingerprint.env_aws: Error querying AWS Metadata URL, skipping")
return false
}
defer resp.Body.Close()
instanceID, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Printf("[ERR] fingerprint.env_aws: Error reading AWS Instance ID, skipping")
return false
}
match, err := regexp.MatchString("ami-*", string(instanceID))
if !match {
return false
}
return true
}
// EnvAWSFingerprint uses lookup table to approximate network speeds
func (f *EnvAWSFingerprint) linkSpeed() int {
// Query the API for the instance type, and use the table above to approximate
// the network speed
metadataURL := os.Getenv("AWS_ENV_URL")
if metadataURL == "" {
metadataURL = "http://169.254.169.254/latest/meta-data/"
}
// assume 2 seconds is enough time for inside AWS network
client := &http.Client{
Timeout: 2 * time.Second,
}
res, err := client.Get(metadataURL + "instance-type")
body, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
f.logger.Printf("[ERR]: fingerprint.env_aws: Error reading response body for instance-type")
return 0
}
key := strings.Trim(string(body), "\n")
v, ok := ec2InstanceSpeedMap[key]
if !ok {
return 0
}
return v
}