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340 lines
10 KiB
340 lines
10 KiB
// Copyright 2021 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package aws
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import (
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"context"
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"fmt"
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"net"
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"strings"
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
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"github.com/aws/aws-sdk-go/aws/ec2metadata"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/ec2"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/pkg/errors"
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"github.com/prometheus/common/config"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/discovery"
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"github.com/prometheus/prometheus/discovery/refresh"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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"github.com/prometheus/prometheus/util/strutil"
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)
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const (
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ec2Label = model.MetaLabelPrefix + "ec2_"
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ec2LabelAMI = ec2Label + "ami"
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ec2LabelAZ = ec2Label + "availability_zone"
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ec2LabelAZID = ec2Label + "availability_zone_id"
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ec2LabelArch = ec2Label + "architecture"
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ec2LabelIPv6Addresses = ec2Label + "ipv6_addresses"
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ec2LabelInstanceID = ec2Label + "instance_id"
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ec2LabelInstanceLifecycle = ec2Label + "instance_lifecycle"
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ec2LabelInstanceState = ec2Label + "instance_state"
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ec2LabelInstanceType = ec2Label + "instance_type"
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ec2LabelOwnerID = ec2Label + "owner_id"
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ec2LabelPlatform = ec2Label + "platform"
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ec2LabelPrimarySubnetID = ec2Label + "primary_subnet_id"
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ec2LabelPrivateDNS = ec2Label + "private_dns_name"
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ec2LabelPrivateIP = ec2Label + "private_ip"
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ec2LabelPublicDNS = ec2Label + "public_dns_name"
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ec2LabelPublicIP = ec2Label + "public_ip"
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ec2LabelSubnetID = ec2Label + "subnet_id"
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ec2LabelTag = ec2Label + "tag_"
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ec2LabelVPCID = ec2Label + "vpc_id"
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ec2LabelSeparator = ","
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)
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var (
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// DefaultEC2SDConfig is the default EC2 SD configuration.
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DefaultEC2SDConfig = EC2SDConfig{
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Port: 80,
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RefreshInterval: model.Duration(60 * time.Second),
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}
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)
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func init() {
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discovery.RegisterConfig(&EC2SDConfig{})
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}
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// EC2Filter is the configuration for filtering EC2 instances.
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type EC2Filter struct {
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Name string `yaml:"name"`
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Values []string `yaml:"values"`
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}
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// EC2SDConfig is the configuration for EC2 based service discovery.
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type EC2SDConfig struct {
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Endpoint string `yaml:"endpoint"`
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Region string `yaml:"region"`
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AccessKey string `yaml:"access_key,omitempty"`
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SecretKey config.Secret `yaml:"secret_key,omitempty"`
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Profile string `yaml:"profile,omitempty"`
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RoleARN string `yaml:"role_arn,omitempty"`
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RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
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Port int `yaml:"port"`
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Filters []*EC2Filter `yaml:"filters"`
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}
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// Name returns the name of the EC2 Config.
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func (*EC2SDConfig) Name() string { return "ec2" }
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// NewDiscoverer returns a Discoverer for the EC2 Config.
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func (c *EC2SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
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return NewEC2Discovery(c, opts.Logger), nil
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}
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// UnmarshalYAML implements the yaml.Unmarshaler interface for the EC2 Config.
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func (c *EC2SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
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*c = DefaultEC2SDConfig
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type plain EC2SDConfig
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err := unmarshal((*plain)(c))
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if err != nil {
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return err
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}
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if c.Region == "" {
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sess, err := session.NewSession()
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if err != nil {
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return err
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}
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metadata := ec2metadata.New(sess)
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region, err := metadata.Region()
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if err != nil {
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return errors.New("EC2 SD configuration requires a region")
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}
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c.Region = region
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}
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for _, f := range c.Filters {
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if len(f.Values) == 0 {
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return errors.New("EC2 SD configuration filter values cannot be empty")
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}
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}
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return nil
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}
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// EC2Discovery periodically performs EC2-SD requests. It implements
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// the Discoverer interface.
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type EC2Discovery struct {
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*refresh.Discovery
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logger log.Logger
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cfg *EC2SDConfig
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ec2 *ec2.EC2
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// azToAZID maps this account's availability zones to their underlying AZ
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// ID, e.g. eu-west-2a -> euw2-az2. Refreshes are performed sequentially, so
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// no locking is required.
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azToAZID map[string]string
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}
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// NewEC2Discovery returns a new EC2Discovery which periodically refreshes its targets.
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func NewEC2Discovery(conf *EC2SDConfig, logger log.Logger) *EC2Discovery {
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if logger == nil {
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logger = log.NewNopLogger()
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}
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d := &EC2Discovery{
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logger: logger,
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cfg: conf,
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}
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d.Discovery = refresh.NewDiscovery(
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logger,
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"ec2",
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time.Duration(d.cfg.RefreshInterval),
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d.refresh,
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)
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return d
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}
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func (d *EC2Discovery) ec2Client(ctx context.Context) (*ec2.EC2, error) {
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if d.ec2 != nil {
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return d.ec2, nil
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}
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creds := credentials.NewStaticCredentials(d.cfg.AccessKey, string(d.cfg.SecretKey), "")
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if d.cfg.AccessKey == "" && d.cfg.SecretKey == "" {
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creds = nil
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}
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sess, err := session.NewSessionWithOptions(session.Options{
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Config: aws.Config{
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Endpoint: &d.cfg.Endpoint,
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Region: &d.cfg.Region,
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Credentials: creds,
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},
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Profile: d.cfg.Profile,
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})
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if err != nil {
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return nil, errors.Wrap(err, "could not create aws session")
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}
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if d.cfg.RoleARN != "" {
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creds := stscreds.NewCredentials(sess, d.cfg.RoleARN)
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d.ec2 = ec2.New(sess, &aws.Config{Credentials: creds})
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} else {
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d.ec2 = ec2.New(sess)
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}
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return d.ec2, nil
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}
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func (d *EC2Discovery) refreshAZIDs(ctx context.Context) error {
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azs, err := d.ec2.DescribeAvailabilityZonesWithContext(ctx, &ec2.DescribeAvailabilityZonesInput{})
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if err != nil {
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return err
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}
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d.azToAZID = make(map[string]string, len(azs.AvailabilityZones))
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for _, az := range azs.AvailabilityZones {
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d.azToAZID[*az.ZoneName] = *az.ZoneId
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}
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return nil
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}
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func (d *EC2Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
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ec2Client, err := d.ec2Client(ctx)
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if err != nil {
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return nil, err
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}
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tg := &targetgroup.Group{
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Source: d.cfg.Region,
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}
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var filters []*ec2.Filter
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for _, f := range d.cfg.Filters {
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filters = append(filters, &ec2.Filter{
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Name: aws.String(f.Name),
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Values: aws.StringSlice(f.Values),
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})
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}
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// Only refresh the AZ ID map if we have never been able to build one.
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// Prometheus requires a reload if AWS adds a new AZ to the region.
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if d.azToAZID == nil {
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if err := d.refreshAZIDs(ctx); err != nil {
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level.Warn(d.logger).Log(
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"msg", "Unable to describe availability zones, ensure Prometheus has ec2:DescribeAvailabilityZones",
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"err", err)
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}
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}
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input := &ec2.DescribeInstancesInput{Filters: filters}
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if err := ec2Client.DescribeInstancesPagesWithContext(ctx, input, func(p *ec2.DescribeInstancesOutput, lastPage bool) bool {
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for _, r := range p.Reservations {
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for _, inst := range r.Instances {
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if inst.PrivateIpAddress == nil {
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continue
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}
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labels := model.LabelSet{
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ec2LabelInstanceID: model.LabelValue(*inst.InstanceId),
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}
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if r.OwnerId != nil {
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labels[ec2LabelOwnerID] = model.LabelValue(*r.OwnerId)
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}
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labels[ec2LabelPrivateIP] = model.LabelValue(*inst.PrivateIpAddress)
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if inst.PrivateDnsName != nil {
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labels[ec2LabelPrivateDNS] = model.LabelValue(*inst.PrivateDnsName)
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}
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addr := net.JoinHostPort(*inst.PrivateIpAddress, fmt.Sprintf("%d", d.cfg.Port))
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labels[model.AddressLabel] = model.LabelValue(addr)
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if inst.Platform != nil {
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labels[ec2LabelPlatform] = model.LabelValue(*inst.Platform)
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}
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if inst.PublicIpAddress != nil {
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labels[ec2LabelPublicIP] = model.LabelValue(*inst.PublicIpAddress)
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labels[ec2LabelPublicDNS] = model.LabelValue(*inst.PublicDnsName)
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}
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labels[ec2LabelAMI] = model.LabelValue(*inst.ImageId)
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labels[ec2LabelAZ] = model.LabelValue(*inst.Placement.AvailabilityZone)
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azID, ok := d.azToAZID[*inst.Placement.AvailabilityZone]
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if !ok && d.azToAZID != nil {
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level.Debug(d.logger).Log(
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"msg", "Availability zone not found, try reloading Prometheus",
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"az", *inst.Placement.AvailabilityZone)
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}
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labels[ec2LabelAZID] = model.LabelValue(azID)
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labels[ec2LabelInstanceState] = model.LabelValue(*inst.State.Name)
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labels[ec2LabelInstanceType] = model.LabelValue(*inst.InstanceType)
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if inst.InstanceLifecycle != nil {
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labels[ec2LabelInstanceLifecycle] = model.LabelValue(*inst.InstanceLifecycle)
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}
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if inst.Architecture != nil {
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labels[ec2LabelArch] = model.LabelValue(*inst.Architecture)
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}
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if inst.VpcId != nil {
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labels[ec2LabelVPCID] = model.LabelValue(*inst.VpcId)
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labels[ec2LabelPrimarySubnetID] = model.LabelValue(*inst.SubnetId)
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var subnets []string
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var ipv6addrs []string
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subnetsMap := make(map[string]struct{})
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for _, eni := range inst.NetworkInterfaces {
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if eni.SubnetId == nil {
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continue
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}
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// Deduplicate VPC Subnet IDs maintaining the order of the subnets returned by EC2.
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if _, ok := subnetsMap[*eni.SubnetId]; !ok {
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subnetsMap[*eni.SubnetId] = struct{}{}
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subnets = append(subnets, *eni.SubnetId)
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}
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for _, ipv6addr := range eni.Ipv6Addresses {
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ipv6addrs = append(ipv6addrs, *ipv6addr.Ipv6Address)
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}
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}
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labels[ec2LabelSubnetID] = model.LabelValue(
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ec2LabelSeparator +
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strings.Join(subnets, ec2LabelSeparator) +
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ec2LabelSeparator)
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if len(ipv6addrs) > 0 {
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labels[ec2LabelIPv6Addresses] = model.LabelValue(
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ec2LabelSeparator +
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strings.Join(ipv6addrs, ec2LabelSeparator) +
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ec2LabelSeparator)
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}
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}
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for _, t := range inst.Tags {
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if t == nil || t.Key == nil || t.Value == nil {
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continue
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}
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name := strutil.SanitizeLabelName(*t.Key)
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labels[ec2LabelTag+model.LabelName(name)] = model.LabelValue(*t.Value)
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}
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tg.Targets = append(tg.Targets, labels)
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}
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}
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return true
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}); err != nil {
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if awsErr, ok := err.(awserr.Error); ok && (awsErr.Code() == "AuthFailure" || awsErr.Code() == "UnauthorizedOperation") {
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d.ec2 = nil
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}
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return nil, errors.Wrap(err, "could not describe instances")
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}
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return []*targetgroup.Group{tg}, nil
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}
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