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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"
"fmt"
"net/http"
"time"
"github.com/go-kit/kit/log"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack"
"github.com/mwitkow/go-conntrack"
"github.com/prometheus/client_golang/prometheus"
config_util "github.com/prometheus/common/config"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/discovery/targetgroup"
)
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.",
})
// DefaultSDConfig is the default OpenStack SD configuration.
DefaultSDConfig = SDConfig{
Port: 80,
RefreshInterval: model.Duration(60 * time.Second),
}
)
// SDConfig is the configuration for OpenStack based service discovery.
type SDConfig struct {
IdentityEndpoint string `yaml:"identity_endpoint"`
Username string `yaml:"username"`
UserID string `yaml:"userid"`
Password config_util.Secret `yaml:"password"`
ProjectName string `yaml:"project_name"`
ProjectID string `yaml:"project_id"`
DomainName string `yaml:"domain_name"`
DomainID string `yaml:"domain_id"`
ApplicationCredentialName string `yaml:"application_credential_name"`
ApplicationCredentialID string `yaml:"application_credential_id"`
ApplicationCredentialSecret config_util.Secret `yaml:"application_credential_secret"`
Role Role `yaml:"role"`
Region string `yaml:"region"`
RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
Port int `yaml:"port"`
AllTenants bool `yaml:"all_tenants,omitempty"`
TLSConfig config_util.TLSConfig `yaml:"tls_config,omitempty"`
}
// OpenStackRole is role of the target in OpenStack.
type Role string
// The valid options for OpenStackRole.
const (
// OpenStack document reference
// https://docs.openstack.org/nova/pike/admin/arch.html#hypervisors
OpenStackRoleHypervisor Role = "hypervisor"
// OpenStack document reference
// https://docs.openstack.org/horizon/pike/user/launch-instances.html
OpenStackRoleInstance Role = "instance"
)
// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (c *Role) UnmarshalYAML(unmarshal func(interface{}) error) error {
if err := unmarshal((*string)(c)); err != nil {
return err
}
switch *c {
case OpenStackRoleHypervisor, OpenStackRoleInstance:
return nil
default:
return fmt.Errorf("unknown OpenStack SD role %q", *c)
}
}
// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
*c = DefaultSDConfig
type plain SDConfig
err := unmarshal((*plain)(c))
if err != nil {
return err
}
if c.Role == "" {
return fmt.Errorf("role missing (one of: instance, hypervisor)")
}
if c.Region == "" {
return fmt.Errorf("openstack SD configuration requires a region")
}
return nil
}
func init() {
prometheus.MustRegister(refreshFailuresCount)
prometheus.MustRegister(refreshDuration)
}
// Discovery periodically performs OpenStack-SD requests. It implements
// the Discoverer interface.
type Discovery interface {
Run(ctx context.Context, ch chan<- []*targetgroup.Group)
refresh() (tg *targetgroup.Group, err error)
}
// NewDiscovery returns a new OpenStackDiscovery which periodically refreshes its targets.
func NewDiscovery(conf *SDConfig, 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,
ApplicationCredentialID: conf.ApplicationCredentialID,
ApplicationCredentialName: conf.ApplicationCredentialName,
ApplicationCredentialSecret: string(conf.ApplicationCredentialSecret),
}
}
client, err := openstack.NewClient(opts.IdentityEndpoint)
if err != nil {
return nil, err
}
tls, err := config_util.NewTLSConfig(&conf.TLSConfig)
if err != nil {
return nil, err
}
client.HTTPClient = http.Client{
Transport: &http.Transport{
IdleConnTimeout: 5 * time.Duration(conf.RefreshInterval),
TLSClientConfig: tls,
DialContext: conntrack.NewDialContextFunc(
conntrack.DialWithTracing(),
conntrack.DialWithName("openstack_sd"),
),
},
Timeout: 5 * time.Duration(conf.RefreshInterval),
}
switch conf.Role {
case OpenStackRoleHypervisor:
hypervisor := NewHypervisorDiscovery(client, &opts,
time.Duration(conf.RefreshInterval), conf.Port, conf.Region, l)
return hypervisor, nil
case OpenStackRoleInstance:
instance := NewInstanceDiscovery(client, &opts,
time.Duration(conf.RefreshInterval), conf.Port, conf.Region, conf.AllTenants, l)
return instance, nil
default:
return nil, errors.New("unknown OpenStack discovery role")
}
}
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