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https://github.com/prometheus/prometheus.git
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341 lines
10 KiB
Go
341 lines
10 KiB
Go
// Copyright 2020 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package uyuni
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"net/url"
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"path"
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"strings"
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"time"
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"github.com/go-kit/log"
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"github.com/kolo/xmlrpc"
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"github.com/prometheus/common/config"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/discovery"
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"github.com/prometheus/prometheus/discovery/refresh"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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)
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const (
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uyuniXMLRPCAPIPath = "/rpc/api"
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uyuniMetaLabelPrefix = model.MetaLabelPrefix + "uyuni_"
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uyuniLabelMinionHostname = uyuniMetaLabelPrefix + "minion_hostname"
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uyuniLabelPrimaryFQDN = uyuniMetaLabelPrefix + "primary_fqdn"
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uyuniLablelSystemID = uyuniMetaLabelPrefix + "system_id"
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uyuniLablelGroups = uyuniMetaLabelPrefix + "groups"
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uyuniLablelEndpointName = uyuniMetaLabelPrefix + "endpoint_name"
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uyuniLablelExporter = uyuniMetaLabelPrefix + "exporter"
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uyuniLabelProxyModule = uyuniMetaLabelPrefix + "proxy_module"
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uyuniLabelMetricsPath = uyuniMetaLabelPrefix + "metrics_path"
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uyuniLabelScheme = uyuniMetaLabelPrefix + "scheme"
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tokenDuration = 10 * time.Minute
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)
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// DefaultSDConfig is the default Uyuni SD configuration.
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var DefaultSDConfig = SDConfig{
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Entitlement: "monitoring_entitled",
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Separator: ",",
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RefreshInterval: model.Duration(1 * time.Minute),
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HTTPClientConfig: config.DefaultHTTPClientConfig,
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}
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func init() {
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discovery.RegisterConfig(&SDConfig{})
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}
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// SDConfig is the configuration for Uyuni based service discovery.
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type SDConfig struct {
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Server string `yaml:"server"`
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Username string `yaml:"username"`
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Password config.Secret `yaml:"password"`
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HTTPClientConfig config.HTTPClientConfig `yaml:",inline"`
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Entitlement string `yaml:"entitlement,omitempty"`
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Separator string `yaml:"separator,omitempty"`
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RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
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}
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type systemGroupID struct {
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GroupID int `xmlrpc:"id"`
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GroupName string `xmlrpc:"name"`
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}
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type networkInfo struct {
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SystemID int `xmlrpc:"system_id"`
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Hostname string `xmlrpc:"hostname"`
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PrimaryFQDN string `xmlrpc:"primary_fqdn"`
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IP string `xmlrpc:"ip"`
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}
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type endpointInfo struct {
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SystemID int `xmlrpc:"system_id"`
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EndpointName string `xmlrpc:"endpoint_name"`
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Port int `xmlrpc:"port"`
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Path string `xmlrpc:"path"`
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Module string `xmlrpc:"module"`
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ExporterName string `xmlrpc:"exporter_name"`
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TLSEnabled bool `xmlrpc:"tls_enabled"`
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}
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// Discovery periodically performs Uyuni API requests. It implements the Discoverer interface.
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type Discovery struct {
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*refresh.Discovery
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apiURL *url.URL
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roundTripper http.RoundTripper
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username string
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password string
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token string
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tokenExpiration time.Time
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entitlement string
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separator string
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interval time.Duration
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logger log.Logger
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}
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// Name returns the name of the Config.
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func (*SDConfig) Name() string { return "uyuni" }
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// NewDiscoverer returns a Discoverer for the Config.
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func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
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return NewDiscovery(c, opts.Logger)
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}
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// SetDirectory joins any relative file paths with dir.
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func (c *SDConfig) SetDirectory(dir string) {
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c.HTTPClientConfig.SetDirectory(dir)
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}
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// UnmarshalYAML implements the yaml.Unmarshaler interface.
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func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
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*c = DefaultSDConfig
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type plain SDConfig
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err := unmarshal((*plain)(c))
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if err != nil {
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return err
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}
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if c.Server == "" {
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return errors.New("Uyuni SD configuration requires server host")
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}
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_, err = url.Parse(c.Server)
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if err != nil {
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return fmt.Errorf("Uyuni Server URL is not valid: %w", err)
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}
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if c.Username == "" {
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return errors.New("Uyuni SD configuration requires a username")
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}
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if c.Password == "" {
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return errors.New("Uyuni SD configuration requires a password")
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}
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return nil
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}
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func login(rpcclient *xmlrpc.Client, user, pass string, duration int) (string, error) {
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var result string
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err := rpcclient.Call("auth.login", []interface{}{user, pass, duration}, &result)
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return result, err
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}
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func getSystemGroupsInfoOfMonitoredClients(rpcclient *xmlrpc.Client, token, entitlement string) (map[int][]systemGroupID, error) {
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var systemGroupsInfos []struct {
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SystemID int `xmlrpc:"id"`
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SystemGroups []systemGroupID `xmlrpc:"system_groups"`
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}
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err := rpcclient.Call("system.listSystemGroupsForSystemsWithEntitlement", []interface{}{token, entitlement}, &systemGroupsInfos)
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if err != nil {
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return nil, err
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}
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result := make(map[int][]systemGroupID)
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for _, systemGroupsInfo := range systemGroupsInfos {
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result[systemGroupsInfo.SystemID] = systemGroupsInfo.SystemGroups
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}
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return result, nil
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}
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func getNetworkInformationForSystems(rpcclient *xmlrpc.Client, token string, systemIDs []int) (map[int]networkInfo, error) {
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var networkInfos []networkInfo
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err := rpcclient.Call("system.getNetworkForSystems", []interface{}{token, systemIDs}, &networkInfos)
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if err != nil {
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return nil, err
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}
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result := make(map[int]networkInfo)
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for _, networkInfo := range networkInfos {
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result[networkInfo.SystemID] = networkInfo
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}
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return result, nil
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}
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func getEndpointInfoForSystems(
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rpcclient *xmlrpc.Client,
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token string,
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systemIDs []int,
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) ([]endpointInfo, error) {
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var endpointInfos []endpointInfo
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err := rpcclient.Call(
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"system.monitoring.listEndpoints",
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[]interface{}{token, systemIDs}, &endpointInfos)
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if err != nil {
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return nil, err
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}
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return endpointInfos, err
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}
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// NewDiscovery returns a uyuni discovery for the given configuration.
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func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
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apiURL, err := url.Parse(conf.Server)
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if err != nil {
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return nil, err
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}
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apiURL.Path = path.Join(apiURL.Path, uyuniXMLRPCAPIPath)
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rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "uyuni_sd")
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if err != nil {
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return nil, err
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}
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d := &Discovery{
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apiURL: apiURL,
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roundTripper: rt,
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username: conf.Username,
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password: string(conf.Password),
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entitlement: conf.Entitlement,
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separator: conf.Separator,
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interval: time.Duration(conf.RefreshInterval),
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logger: logger,
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}
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d.Discovery = refresh.NewDiscovery(
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logger,
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"uyuni",
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time.Duration(conf.RefreshInterval),
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d.refresh,
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)
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return d, nil
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}
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func (d *Discovery) getEndpointLabels(
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endpoint endpointInfo,
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systemGroupIDs []systemGroupID,
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networkInfo networkInfo,
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) model.LabelSet {
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var addr, scheme string
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managedGroupNames := getSystemGroupNames(systemGroupIDs)
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addr = fmt.Sprintf("%s:%d", networkInfo.Hostname, endpoint.Port)
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if endpoint.TLSEnabled {
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scheme = "https"
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} else {
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scheme = "http"
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}
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result := model.LabelSet{
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model.AddressLabel: model.LabelValue(addr),
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uyuniLabelMinionHostname: model.LabelValue(networkInfo.Hostname),
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uyuniLabelPrimaryFQDN: model.LabelValue(networkInfo.PrimaryFQDN),
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uyuniLablelSystemID: model.LabelValue(fmt.Sprintf("%d", endpoint.SystemID)),
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uyuniLablelGroups: model.LabelValue(strings.Join(managedGroupNames, d.separator)),
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uyuniLablelEndpointName: model.LabelValue(endpoint.EndpointName),
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uyuniLablelExporter: model.LabelValue(endpoint.ExporterName),
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uyuniLabelProxyModule: model.LabelValue(endpoint.Module),
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uyuniLabelMetricsPath: model.LabelValue(endpoint.Path),
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uyuniLabelScheme: model.LabelValue(scheme),
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}
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return result
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}
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func getSystemGroupNames(systemGroupsIDs []systemGroupID) []string {
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managedGroupNames := make([]string, 0, len(systemGroupsIDs))
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for _, systemGroupInfo := range systemGroupsIDs {
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managedGroupNames = append(managedGroupNames, systemGroupInfo.GroupName)
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}
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return managedGroupNames
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}
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func (d *Discovery) getTargetsForSystems(
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rpcClient *xmlrpc.Client,
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entitlement string,
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) ([]model.LabelSet, error) {
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result := make([]model.LabelSet, 0)
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systemGroupIDsBySystemID, err := getSystemGroupsInfoOfMonitoredClients(rpcClient, d.token, entitlement)
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if err != nil {
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return nil, fmt.Errorf("unable to get the managed system groups information of monitored clients: %w", err)
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}
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systemIDs := make([]int, 0, len(systemGroupIDsBySystemID))
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for systemID := range systemGroupIDsBySystemID {
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systemIDs = append(systemIDs, systemID)
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}
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endpointInfos, err := getEndpointInfoForSystems(rpcClient, d.token, systemIDs)
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if err != nil {
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return nil, fmt.Errorf("unable to get endpoints information: %w", err)
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}
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networkInfoBySystemID, err := getNetworkInformationForSystems(rpcClient, d.token, systemIDs)
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if err != nil {
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return nil, fmt.Errorf("unable to get the systems network information: %w", err)
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}
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for _, endpoint := range endpointInfos {
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systemID := endpoint.SystemID
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labels := d.getEndpointLabels(
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endpoint,
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systemGroupIDsBySystemID[systemID],
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networkInfoBySystemID[systemID])
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result = append(result, labels)
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}
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return result, nil
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}
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func (d *Discovery) refresh(_ context.Context) ([]*targetgroup.Group, error) {
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rpcClient, err := xmlrpc.NewClient(d.apiURL.String(), d.roundTripper)
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if err != nil {
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return nil, err
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}
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defer rpcClient.Close()
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if time.Now().After(d.tokenExpiration) {
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// Uyuni API takes duration in seconds.
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d.token, err = login(rpcClient, d.username, d.password, int(tokenDuration.Seconds()))
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if err != nil {
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return nil, fmt.Errorf("unable to login to Uyuni API: %w", err)
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}
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// Login again at half the token lifetime.
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d.tokenExpiration = time.Now().Add(tokenDuration / 2)
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}
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targetsForSystems, err := d.getTargetsForSystems(rpcClient, d.entitlement)
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if err != nil {
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// Force the renewal of the token on next refresh.
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d.tokenExpiration = time.Now()
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return nil, err
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}
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return []*targetgroup.Group{{Targets: targetsForSystems, Source: d.apiURL.String()}}, nil
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}
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