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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"
"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/hypervisors"
"github.com/gophercloud/gophercloud/pagination"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/discovery/targetgroup"
)
const (
openstackLabelHypervisorHostIP = openstackLabelPrefix + "hypervisor_host_ip"
openstackLabelHypervisorHostName = openstackLabelPrefix + "hypervisor_hostname"
openstackLabelHypervisorStatus = openstackLabelPrefix + "hypervisor_status"
openstackLabelHypervisorState = openstackLabelPrefix + "hypervisor_state"
openstackLabelHypervisorType = openstackLabelPrefix + "hypervisor_type"
)
// HypervisorDiscovery discovers OpenStack hypervisors.
type HypervisorDiscovery struct {
provider *gophercloud.ProviderClient
authOpts *gophercloud.AuthOptions
region string
interval time.Duration
logger log.Logger
port int
}
// NewHypervisorDiscovery returns a new hypervisor discovery.
func NewHypervisorDiscovery(provider *gophercloud.ProviderClient, opts *gophercloud.AuthOptions,
interval time.Duration, port int, region string, l log.Logger) *HypervisorDiscovery {
return &HypervisorDiscovery{provider: provider, authOpts: opts,
region: region, interval: interval, port: port, logger: l}
}
// Run implements the Discoverer interface.
func (h *HypervisorDiscovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
// Get an initial set right away.
tg, err := h.refresh()
if err != nil {
level.Error(h.logger).Log("msg", "Unable refresh target groups", "err", err.Error())
} else {
select {
case ch <- []*targetgroup.Group{tg}:
case <-ctx.Done():
return
}
}
ticker := time.NewTicker(h.interval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
tg, err := h.refresh()
if err != nil {
level.Error(h.logger).Log("msg", "Unable refresh target groups", "err", err.Error())
continue
}
select {
case ch <- []*targetgroup.Group{tg}:
case <-ctx.Done():
return
}
case <-ctx.Done():
return
}
}
}
func (h *HypervisorDiscovery) refresh() (*targetgroup.Group, error) {
var err error
t0 := time.Now()
defer func() {
refreshDuration.Observe(time.Since(t0).Seconds())
if err != nil {
refreshFailuresCount.Inc()
}
}()
err = openstack.Authenticate(h.provider, *h.authOpts)
if err != nil {
return nil, fmt.Errorf("could not authenticate to OpenStack: %s", err)
}
client, err := openstack.NewComputeV2(h.provider, gophercloud.EndpointOpts{
Region: h.region,
})
if err != nil {
return nil, fmt.Errorf("could not create OpenStack compute session: %s", err)
}
tg := &targetgroup.Group{
Source: fmt.Sprintf("OS_" + h.region),
}
// OpenStack API reference
// https://developer.openstack.org/api-ref/compute/#list-hypervisors-details
pagerHypervisors := hypervisors.List(client)
err = pagerHypervisors.EachPage(func(page pagination.Page) (bool, error) {
hypervisorList, err := hypervisors.ExtractHypervisors(page)
if err != nil {
return false, fmt.Errorf("could not extract hypervisors: %s", err)
}
for _, hypervisor := range hypervisorList {
labels := model.LabelSet{}
addr := net.JoinHostPort(hypervisor.HostIP, fmt.Sprintf("%d", h.port))
labels[model.AddressLabel] = model.LabelValue(addr)
labels[openstackLabelHypervisorHostName] = model.LabelValue(hypervisor.HypervisorHostname)
labels[openstackLabelHypervisorHostIP] = model.LabelValue(hypervisor.HostIP)
labels[openstackLabelHypervisorStatus] = model.LabelValue(hypervisor.Status)
labels[openstackLabelHypervisorState] = model.LabelValue(hypervisor.State)
labels[openstackLabelHypervisorType] = model.LabelValue(hypervisor.HypervisorType)
tg.Targets = append(tg.Targets, labels)
}
return true, nil
})
if err != nil {
return nil, err
}
return tg, nil
}
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