prometheus/discovery/openstack/instance.go

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// Copyright 2017 The Prometheus 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 openstack
import (
"context"
"fmt"
"net"
"time"
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"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack"
"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/floatingips"
"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
"github.com/gophercloud/gophercloud/pagination"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/util/strutil"
)
const (
openstackLabelPrefix = model.MetaLabelPrefix + "openstack_"
openstackLabelInstanceID = openstackLabelPrefix + "instance_id"
openstackLabelInstanceName = openstackLabelPrefix + "instance_name"
openstackLabelInstanceStatus = openstackLabelPrefix + "instance_status"
openstackLabelInstanceFlavor = openstackLabelPrefix + "instance_flavor"
openstackLabelPublicIP = openstackLabelPrefix + "public_ip"
openstackLabelPrivateIP = openstackLabelPrefix + "private_ip"
openstackLabelTagPrefix = openstackLabelPrefix + "tag_"
)
// InstanceDiscovery discovers OpenStack instances.
type InstanceDiscovery struct {
authOpts *gophercloud.AuthOptions
region string
interval time.Duration
logger log.Logger
port int
}
// NewInstanceDiscovery returns a new instance discovery.
func NewInstanceDiscovery(opts *gophercloud.AuthOptions,
interval time.Duration, port int, region string, l log.Logger) *InstanceDiscovery {
if l == nil {
l = log.NewNopLogger()
}
return &InstanceDiscovery{authOpts: opts,
region: region, interval: interval, port: port, logger: l}
}
// Run implements the TargetProvider interface.
func (i *InstanceDiscovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
// Get an initial set right away.
tg, err := i.refresh()
if err != nil {
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level.Error(i.logger).Log("msg", "Unable to refresh target groups", "err", err.Error())
} else {
select {
case ch <- []*config.TargetGroup{tg}:
case <-ctx.Done():
return
}
}
ticker := time.NewTicker(i.interval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
tg, err := i.refresh()
if err != nil {
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level.Error(i.logger).Log("msg", "Unable to refresh target groups", "err", err.Error())
continue
}
select {
case ch <- []*config.TargetGroup{tg}:
case <-ctx.Done():
return
}
case <-ctx.Done():
return
}
}
}
func (i *InstanceDiscovery) refresh() (*config.TargetGroup, error) {
var err error
t0 := time.Now()
defer func() {
refreshDuration.Observe(time.Since(t0).Seconds())
if err != nil {
refreshFailuresCount.Inc()
}
}()
provider, err := openstack.AuthenticatedClient(*i.authOpts)
if err != nil {
return nil, fmt.Errorf("could not create OpenStack session: %s", err)
}
client, err := openstack.NewComputeV2(provider, gophercloud.EndpointOpts{
Region: i.region,
})
if err != nil {
return nil, fmt.Errorf("could not create OpenStack compute session: %s", err)
}
// OpenStack API reference
// https://developer.openstack.org/api-ref/compute/#list-floating-ips
pagerFIP := floatingips.List(client)
floatingIPList := make(map[string][]string)
err = pagerFIP.EachPage(func(page pagination.Page) (bool, error) {
result, err := floatingips.ExtractFloatingIPs(page)
if err != nil {
return false, fmt.Errorf("could not extract floatingips: %s", err)
}
for _, ip := range result {
// Skip not associated ips
if ip.InstanceID != "" {
floatingIPList[ip.InstanceID] = append(floatingIPList[ip.InstanceID], ip.IP)
}
}
return true, nil
})
if err != nil {
return nil, err
}
// OpenStack API reference
// https://developer.openstack.org/api-ref/compute/#list-servers
opts := servers.ListOpts{}
pager := servers.List(client, opts)
tg := &config.TargetGroup{
Source: fmt.Sprintf("OS_" + i.region),
}
err = pager.EachPage(func(page pagination.Page) (bool, error) {
instanceList, err := servers.ExtractServers(page)
if err != nil {
return false, fmt.Errorf("could not extract instances: %s", err)
}
for _, s := range instanceList {
labels := model.LabelSet{
openstackLabelInstanceID: model.LabelValue(s.ID),
}
if len(s.Addresses) == 0 {
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level.Info(i.logger).Log("msg", "Got no IP address", "instance", s.ID)
continue
}
for _, address := range s.Addresses {
md, ok := address.([]interface{})
if !ok {
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level.Warn(i.logger).Log("msg", "Invalid type for address, expected array")
continue
}
if len(md) == 0 {
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level.Debug(i.logger).Log("msg", "Got no IP address", "instance", s.ID)
continue
}
md1, ok := md[0].(map[string]interface{})
if !ok {
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level.Warn(i.logger).Log("msg", "Invalid type for address, expected dict")
continue
}
addr, ok := md1["addr"].(string)
if !ok {
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level.Warn(i.logger).Log("msg", "Invalid type for address, expected string")
continue
}
labels[openstackLabelPrivateIP] = model.LabelValue(addr)
addr = net.JoinHostPort(addr, fmt.Sprintf("%d", i.port))
labels[model.AddressLabel] = model.LabelValue(addr)
// Only use first private IP
break
}
if val, ok := floatingIPList[s.ID]; ok && len(val) > 0 {
labels[openstackLabelPublicIP] = model.LabelValue(val[0])
}
labels[openstackLabelInstanceStatus] = model.LabelValue(s.Status)
labels[openstackLabelInstanceName] = model.LabelValue(s.Name)
id, ok := s.Flavor["id"].(string)
if !ok {
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level.Warn(i.logger).Log("msg", "Invalid type for instance id, excepted string")
continue
}
labels[openstackLabelInstanceFlavor] = model.LabelValue(id)
for k, v := range s.Metadata {
name := strutil.SanitizeLabelName(k)
labels[openstackLabelTagPrefix+model.LabelName(name)] = model.LabelValue(v)
}
tg.Targets = append(tg.Targets, labels)
}
return true, nil
})
if err != nil {
return nil, err
}
return tg, nil
}