260 lines
6.8 KiB
Go
260 lines
6.8 KiB
Go
package fingerprint
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"os"
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"regexp"
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"strings"
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"time"
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log "github.com/hashicorp/go-hclog"
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cleanhttp "github.com/hashicorp/go-cleanhttp"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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const (
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// This is where the AWS metadata server normally resides. We hardcode the
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// "instance" path as well since it's the only one we access here.
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DEFAULT_AWS_URL = "http://169.254.169.254/latest/meta-data/"
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// AwsMetadataTimeout is the timeout used when contacting the AWS metadata
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// service
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AwsMetadataTimeout = 2 * time.Second
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)
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// map of instance type to approximate speed, in Mbits/s
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// Estimates from http://stackoverflow.com/a/35806587
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// This data is meant for a loose approximation
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var ec2InstanceSpeedMap = map[*regexp.Regexp]int{
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regexp.MustCompile("t2.nano"): 30,
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regexp.MustCompile("t2.micro"): 70,
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regexp.MustCompile("t2.small"): 125,
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regexp.MustCompile("t2.medium"): 300,
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regexp.MustCompile("m3.medium"): 400,
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regexp.MustCompile("c4.8xlarge"): 4000,
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regexp.MustCompile("x1.16xlarge"): 5000,
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regexp.MustCompile(`.*\.large`): 500,
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regexp.MustCompile(`.*\.xlarge`): 750,
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regexp.MustCompile(`.*\.2xlarge`): 1000,
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regexp.MustCompile(`.*\.4xlarge`): 2000,
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regexp.MustCompile(`.*\.8xlarge`): 10000,
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regexp.MustCompile(`.*\.10xlarge`): 10000,
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regexp.MustCompile(`.*\.16xlarge`): 10000,
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regexp.MustCompile(`.*\.32xlarge`): 10000,
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}
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// EnvAWSFingerprint is used to fingerprint AWS metadata
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type EnvAWSFingerprint struct {
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StaticFingerprinter
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timeout time.Duration
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logger log.Logger
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}
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// NewEnvAWSFingerprint is used to create a fingerprint from AWS metadata
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func NewEnvAWSFingerprint(logger log.Logger) Fingerprint {
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f := &EnvAWSFingerprint{
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logger: logger.Named("env_aws"),
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timeout: AwsMetadataTimeout,
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}
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return f
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}
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func (f *EnvAWSFingerprint) Fingerprint(request *FingerprintRequest, response *FingerprintResponse) error {
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cfg := request.Config
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// Check if we should tighten the timeout
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if cfg.ReadBoolDefault(TightenNetworkTimeoutsConfig, false) {
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f.timeout = 1 * time.Millisecond
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}
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if !f.isAWS() {
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return nil
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}
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// newNetwork is populated and added to the Nodes resources
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newNetwork := &structs.NetworkResource{
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Device: "eth0",
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}
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metadataURL := os.Getenv("AWS_ENV_URL")
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if metadataURL == "" {
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metadataURL = DEFAULT_AWS_URL
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}
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client := &http.Client{
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Timeout: f.timeout,
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Transport: cleanhttp.DefaultTransport(),
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}
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// Keys and whether they should be namespaced as unique. Any key whose value
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// uniquely identifies a node, such as ip, should be marked as unique. When
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// marked as unique, the key isn't included in the computed node class.
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keys := map[string]bool{
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"ami-id": false,
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"hostname": true,
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"instance-id": true,
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"instance-type": false,
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"local-hostname": true,
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"local-ipv4": true,
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"public-hostname": true,
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"public-ipv4": true,
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"placement/availability-zone": false,
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}
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for k, unique := range keys {
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res, err := client.Get(metadataURL + k)
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if res.StatusCode != http.StatusOK {
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f.logger.Debug("could not read attribute value", "attribute", k)
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continue
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}
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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 nil
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}
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// not sure what other errors it would return
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return 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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f.logger.Error("error reading response body for AWS attribute", "attribute", k, "error", err)
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}
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// assume we want blank entries
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key := "platform.aws." + strings.Replace(k, "/", ".", -1)
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if unique {
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key = structs.UniqueNamespace(key)
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}
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response.AddAttribute(key, strings.Trim(string(resp), "\n"))
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}
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// copy over network specific information
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if val, ok := response.Attributes["unique.platform.aws.local-ipv4"]; ok && val != "" {
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response.AddAttribute("unique.network.ip-address", val)
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newNetwork.IP = val
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newNetwork.CIDR = newNetwork.IP + "/32"
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}
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// find LinkSpeed from lookup
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throughput := f.linkSpeed()
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if cfg.NetworkSpeed != 0 {
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throughput = cfg.NetworkSpeed
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} else if throughput == 0 {
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// Failed to determine speed. Check if the network fingerprint got it
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found := false
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if request.Node.Resources != nil && len(request.Node.Resources.Networks) > 0 {
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for _, n := range request.Node.Resources.Networks {
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if n.IP == newNetwork.IP {
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throughput = n.MBits
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found = true
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break
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}
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}
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}
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// Nothing detected so default
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if !found {
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throughput = defaultNetworkSpeed
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}
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}
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newNetwork.MBits = throughput
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response.NodeResources = &structs.NodeResources{
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Networks: []*structs.NetworkResource{newNetwork},
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}
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// populate Links
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response.AddLink("aws.ec2", fmt.Sprintf("%s.%s",
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response.Attributes["platform.aws.placement.availability-zone"],
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response.Attributes["unique.platform.aws.instance-id"]))
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response.Detected = true
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return nil
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}
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func (f *EnvAWSFingerprint) isAWS() bool {
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// Read the internal metadata URL from the environment, allowing test files to
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// provide their own
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metadataURL := os.Getenv("AWS_ENV_URL")
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if metadataURL == "" {
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metadataURL = DEFAULT_AWS_URL
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}
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client := &http.Client{
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Timeout: f.timeout,
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Transport: cleanhttp.DefaultTransport(),
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}
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// Query the metadata url for the ami-id, to verify we're on AWS
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resp, err := client.Get(metadataURL + "ami-id")
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if err != nil {
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f.logger.Debug("error querying AWS Metadata URL, skipping")
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return false
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}
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defer resp.Body.Close()
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if resp.StatusCode >= 400 {
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// URL not found, which indicates that this isn't AWS
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return false
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}
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instanceID, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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f.logger.Debug("error reading AWS Instance ID, skipping")
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return false
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}
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match, err := regexp.MatchString("ami-*", string(instanceID))
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if err != nil || !match {
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return false
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}
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return true
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}
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// EnvAWSFingerprint uses lookup table to approximate network speeds
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func (f *EnvAWSFingerprint) linkSpeed() int {
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// Query the API for the instance type, and use the table above to approximate
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// the network speed
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metadataURL := os.Getenv("AWS_ENV_URL")
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if metadataURL == "" {
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metadataURL = DEFAULT_AWS_URL
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}
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client := &http.Client{
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Timeout: f.timeout,
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Transport: cleanhttp.DefaultTransport(),
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}
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res, err := client.Get(metadataURL + "instance-type")
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if err != nil {
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f.logger.Error("error reading instance-type", "error", err)
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return 0
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}
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body, err := ioutil.ReadAll(res.Body)
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res.Body.Close()
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if err != nil {
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f.logger.Error("error reading response body for instance-type", "error", err)
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return 0
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}
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key := strings.Trim(string(body), "\n")
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netSpeed := 0
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for reg, speed := range ec2InstanceSpeedMap {
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if reg.MatchString(key) {
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netSpeed = speed
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break
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}
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}
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return netSpeed
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}
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