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openstack.go
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openstack.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"
"errors"
"time"
"github.com/go-kit/kit/log"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/prometheus/config"
)
var (
refreshFailuresCount = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "prometheus_sd_openstack_refresh_failures_total",
Help: "The number of OpenStack-SD scrape failures.",
})
refreshDuration = prometheus.NewSummary(
prometheus.SummaryOpts{
Name: "prometheus_sd_openstack_refresh_duration_seconds",
Help: "The duration of an OpenStack-SD refresh in seconds.",
})
)
func init() {
prometheus.MustRegister(refreshFailuresCount)
prometheus.MustRegister(refreshDuration)
}
// Discovery periodically performs OpenStack-SD requests. It implements
// the TargetProvider interface.
type Discovery interface {
Run(ctx context.Context, ch chan<- []*config.TargetGroup)
refresh() (tg *config.TargetGroup, err error)
}
// NewDiscovery returns a new OpenStackDiscovery which periodically refreshes its targets.
func NewDiscovery(conf *config.OpenstackSDConfig, l log.Logger) (Discovery, error) {
var opts gophercloud.AuthOptions
if conf.IdentityEndpoint == "" {
var err error
opts, err = openstack.AuthOptionsFromEnv()
if err != nil {
return nil, err
}
} else {
opts = gophercloud.AuthOptions{
IdentityEndpoint: conf.IdentityEndpoint,
Username: conf.Username,
UserID: conf.UserID,
Password: string(conf.Password),
TenantName: conf.ProjectName,
TenantID: conf.ProjectID,
DomainName: conf.DomainName,
DomainID: conf.DomainID,
}
}
switch conf.Role {
case config.OpenStackRoleHypervisor:
hypervisor := NewHypervisorDiscovery(&opts,
time.Duration(conf.RefreshInterval), conf.Port, conf.Region, l)
return hypervisor, nil
case config.OpenStackRoleInstance:
instance := NewInstanceDiscovery(&opts,
time.Duration(conf.RefreshInterval), conf.Port, conf.Region, l)
return instance, nil
default:
return nil, errors.New("unknown OpenStack discovery role")
}
}