262 lines
7 KiB
Go
262 lines
7 KiB
Go
package fingerprint
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"log"
|
|
"net/http"
|
|
"net/url"
|
|
"os"
|
|
"regexp"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/hashicorp/go-cleanhttp"
|
|
"github.com/hashicorp/nomad/client/config"
|
|
"github.com/hashicorp/nomad/nomad/structs"
|
|
)
|
|
|
|
const (
|
|
// This is where the AWS metadata server normally resides. We hardcode the
|
|
// "instance" path as well since it's the only one we access here.
|
|
DEFAULT_AWS_URL = "http://169.254.169.254/latest/meta-data/"
|
|
|
|
// AwsMetadataTimeout is the timeout used when contacting the AWS metadata
|
|
// service
|
|
AwsMetadataTimeout = 2 * time.Second
|
|
)
|
|
|
|
// map of instance type to approximate speed, in Mbits/s
|
|
// Estimates from http://stackoverflow.com/a/35806587
|
|
// This data is meant for a loose approximation
|
|
var ec2InstanceSpeedMap = map[*regexp.Regexp]int{
|
|
regexp.MustCompile("t2.nano"): 30,
|
|
regexp.MustCompile("t2.micro"): 70,
|
|
regexp.MustCompile("t2.small"): 125,
|
|
regexp.MustCompile("t2.medium"): 300,
|
|
regexp.MustCompile("m3.medium"): 400,
|
|
regexp.MustCompile("c4.8xlarge"): 4000,
|
|
regexp.MustCompile("x1.16xlarge"): 5000,
|
|
regexp.MustCompile(`.*\.large`): 500,
|
|
regexp.MustCompile(`.*\.xlarge`): 750,
|
|
regexp.MustCompile(`.*\.2xlarge`): 1000,
|
|
regexp.MustCompile(`.*\.4xlarge`): 2000,
|
|
regexp.MustCompile(`.*\.8xlarge`): 10000,
|
|
regexp.MustCompile(`.*\.10xlarge`): 10000,
|
|
regexp.MustCompile(`.*\.16xlarge`): 10000,
|
|
regexp.MustCompile(`.*\.32xlarge`): 10000,
|
|
}
|
|
|
|
// EnvAWSFingerprint is used to fingerprint AWS metadata
|
|
type EnvAWSFingerprint struct {
|
|
StaticFingerprinter
|
|
timeout time.Duration
|
|
logger *log.Logger
|
|
}
|
|
|
|
// NewEnvAWSFingerprint is used to create a fingerprint from AWS metadata
|
|
func NewEnvAWSFingerprint(logger *log.Logger) Fingerprint {
|
|
f := &EnvAWSFingerprint{
|
|
logger: logger,
|
|
timeout: AwsMetadataTimeout,
|
|
}
|
|
return f
|
|
}
|
|
|
|
func (f *EnvAWSFingerprint) Fingerprint(cfg *config.Config, node *structs.Node) (bool, error) {
|
|
// Check if we should tighten the timeout
|
|
if cfg.ReadBoolDefault(TightenNetworkTimeoutsConfig, false) {
|
|
f.timeout = 1 * time.Millisecond
|
|
}
|
|
|
|
if !f.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 = DEFAULT_AWS_URL
|
|
}
|
|
|
|
client := &http.Client{
|
|
Timeout: f.timeout,
|
|
Transport: cleanhttp.DefaultTransport(),
|
|
}
|
|
|
|
// Keys and whether they should be namespaced as unique. Any key whose value
|
|
// uniquely identifies a node, such as ip, should be marked as unique. When
|
|
// marked as unique, the key isn't included in the computed node class.
|
|
keys := map[string]bool{
|
|
"ami-id": false,
|
|
"hostname": true,
|
|
"instance-id": true,
|
|
"instance-type": false,
|
|
"local-hostname": true,
|
|
"local-ipv4": true,
|
|
"public-hostname": true,
|
|
"public-ipv4": true,
|
|
"placement/availability-zone": false,
|
|
}
|
|
for k, unique := range keys {
|
|
res, err := client.Get(metadataURL + k)
|
|
if res.StatusCode != http.StatusOK {
|
|
f.logger.Printf("[DEBUG]: fingerprint.env_aws: Could not read value for attribute %q", k)
|
|
continue
|
|
}
|
|
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 := "platform.aws." + strings.Replace(k, "/", ".", -1)
|
|
if unique {
|
|
key = structs.UniqueNamespace(key)
|
|
}
|
|
|
|
node.Attributes[key] = strings.Trim(string(resp), "\n")
|
|
}
|
|
|
|
// copy over network specific information
|
|
if val := node.Attributes["unique.platform.aws.local-ipv4"]; val != "" {
|
|
node.Attributes["unique.network.ip-address"] = val
|
|
newNetwork.IP = val
|
|
newNetwork.CIDR = newNetwork.IP + "/32"
|
|
}
|
|
|
|
// find LinkSpeed from lookup
|
|
throughput := f.linkSpeed()
|
|
if cfg.NetworkSpeed != 0 {
|
|
throughput = cfg.NetworkSpeed
|
|
} else if throughput == 0 {
|
|
// Failed to determine speed. Check if the network fingerprint got it
|
|
found := false
|
|
if node.Resources != nil && len(node.Resources.Networks) > 0 {
|
|
for _, n := range node.Resources.Networks {
|
|
if n.IP == newNetwork.IP {
|
|
throughput = n.MBits
|
|
found = true
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
// Nothing detected so default
|
|
if !found {
|
|
throughput = defaultNetworkSpeed
|
|
}
|
|
}
|
|
|
|
// populate Node Network Resources
|
|
if node.Resources == nil {
|
|
node.Resources = &structs.Resources{}
|
|
}
|
|
newNetwork.MBits = throughput
|
|
node.Resources.Networks = []*structs.NetworkResource{newNetwork}
|
|
|
|
// populate Links
|
|
node.Links["aws.ec2"] = fmt.Sprintf("%s.%s",
|
|
node.Attributes["platform.aws.placement.availability-zone"],
|
|
node.Attributes["unique.platform.aws.instance-id"])
|
|
|
|
return true, nil
|
|
}
|
|
|
|
func (f *EnvAWSFingerprint) 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 = DEFAULT_AWS_URL
|
|
}
|
|
|
|
client := &http.Client{
|
|
Timeout: f.timeout,
|
|
Transport: cleanhttp.DefaultTransport(),
|
|
}
|
|
|
|
// Query the metadata url for the ami-id, to veryify we're on AWS
|
|
resp, err := client.Get(metadataURL + "ami-id")
|
|
if err != nil {
|
|
f.logger.Printf("[DEBUG] fingerprint.env_aws: Error querying AWS Metadata URL, skipping")
|
|
return false
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
if resp.StatusCode >= 400 {
|
|
// URL not found, which indicates that this isn't AWS
|
|
return false
|
|
}
|
|
|
|
instanceID, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
f.logger.Printf("[DEBUG] fingerprint.env_aws: Error reading AWS Instance ID, skipping")
|
|
return false
|
|
}
|
|
|
|
match, err := regexp.MatchString("ami-*", string(instanceID))
|
|
if err != nil || !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 = DEFAULT_AWS_URL
|
|
}
|
|
|
|
client := &http.Client{
|
|
Timeout: f.timeout,
|
|
Transport: cleanhttp.DefaultTransport(),
|
|
}
|
|
|
|
res, err := client.Get(metadataURL + "instance-type")
|
|
if err != nil {
|
|
f.logger.Printf("[ERR]: fingerprint.env_aws: Error reading instance-type: %v", err)
|
|
return 0
|
|
}
|
|
|
|
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: %v", err)
|
|
return 0
|
|
}
|
|
|
|
key := strings.Trim(string(body), "\n")
|
|
netSpeed := 0
|
|
for reg, speed := range ec2InstanceSpeedMap {
|
|
if reg.MatchString(key) {
|
|
netSpeed = speed
|
|
break
|
|
}
|
|
}
|
|
|
|
return netSpeed
|
|
}
|