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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"
"strconv"
"github.com/go-kit/log"
"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 (
openstackLabelHypervisorID = openstackLabelPrefix + "hypervisor_id"
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
logger log.Logger
port int
availability gophercloud.Availability
}
// newHypervisorDiscovery returns a new hypervisor discovery.
func newHypervisorDiscovery(provider *gophercloud.ProviderClient, opts *gophercloud.AuthOptions,
port int, region string, availability gophercloud.Availability, l log.Logger,
) *HypervisorDiscovery {
return &HypervisorDiscovery{
provider: provider, authOpts: opts,
region: region, port: port, availability: availability, logger: l,
}
}
func (h *HypervisorDiscovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
h.provider.Context = ctx
err := openstack.Authenticate(h.provider, *h.authOpts)
if err != nil {
return nil, fmt.Errorf("could not authenticate to OpenStack: %w", err)
}
client, err := openstack.NewComputeV2(h.provider, gophercloud.EndpointOpts{
Region: h.region, Availability: h.availability,
})
if err != nil {
return nil, fmt.Errorf("could not create OpenStack compute session: %w", err)
}
tg := &targetgroup.Group{
Source: "OS_" + h.region,
}
// OpenStack API reference
// https://developer.openstack.org/api-ref/compute/#list-hypervisors-details
pagerHypervisors := hypervisors.List(client, nil)
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: %w", err)
}
for _, hypervisor := range hypervisorList {
labels := model.LabelSet{}
addr := net.JoinHostPort(hypervisor.HostIP, strconv.Itoa(h.port))
labels[model.AddressLabel] = model.LabelValue(addr)
labels[openstackLabelHypervisorID] = model.LabelValue(hypervisor.ID)
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 []*targetgroup.Group{tg}, nil
}
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