mirror of
https://github.com/prometheus/prometheus.git
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253 lines
7.1 KiB
Go
253 lines
7.1 KiB
Go
// Copyright 2021 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 puppetdb
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net"
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"net/http"
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"net/url"
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"path"
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"strconv"
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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/grafana/regexp"
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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/common/version"
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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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pdbLabel = model.MetaLabelPrefix + "puppetdb_"
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pdbLabelQuery = pdbLabel + "query"
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pdbLabelCertname = pdbLabel + "certname"
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pdbLabelResource = pdbLabel + "resource"
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pdbLabelType = pdbLabel + "type"
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pdbLabelTitle = pdbLabel + "title"
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pdbLabelExported = pdbLabel + "exported"
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pdbLabelTags = pdbLabel + "tags"
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pdbLabelFile = pdbLabel + "file"
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pdbLabelEnvironment = pdbLabel + "environment"
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pdbLabelParameter = pdbLabel + "parameter_"
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separator = ","
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)
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var (
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// DefaultSDConfig is the default PuppetDB SD configuration.
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DefaultSDConfig = SDConfig{
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RefreshInterval: model.Duration(60 * time.Second),
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Port: 80,
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HTTPClientConfig: config.DefaultHTTPClientConfig,
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}
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matchContentType = regexp.MustCompile(`^(?i:application\/json(;\s*charset=("utf-8"|utf-8))?)$`)
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userAgent = fmt.Sprintf("Prometheus/%s", version.Version)
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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 PuppetDB based discovery.
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type SDConfig struct {
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HTTPClientConfig config.HTTPClientConfig `yaml:",inline"`
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RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
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URL string `yaml:"url"`
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Query string `yaml:"query"`
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IncludeParameters bool `yaml:"include_parameters"`
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Port int `yaml:"port"`
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}
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// Name returns the name of the Config.
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func (*SDConfig) Name() string { return "puppetdb" }
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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.URL == "" {
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return fmt.Errorf("URL is missing")
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}
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parsedURL, err := url.Parse(c.URL)
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if err != nil {
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return err
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}
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if parsedURL.Scheme != "http" && parsedURL.Scheme != "https" {
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return fmt.Errorf("URL scheme must be 'http' or 'https'")
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}
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if parsedURL.Host == "" {
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return fmt.Errorf("host is missing in URL")
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}
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if c.Query == "" {
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return fmt.Errorf("query missing")
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}
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return nil
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}
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// Discovery provides service discovery functionality based
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// on PuppetDB resources.
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type Discovery struct {
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*refresh.Discovery
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url string
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query string
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port int
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includeParameters bool
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client *http.Client
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}
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// NewDiscovery returns a new PuppetDB discovery for the given config.
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func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
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if logger == nil {
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logger = log.NewNopLogger()
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}
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client, err := config.NewClientFromConfig(conf.HTTPClientConfig, "http")
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if err != nil {
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return nil, err
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}
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client.Timeout = time.Duration(conf.RefreshInterval)
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u, err := url.Parse(conf.URL)
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if err != nil {
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return nil, err
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}
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u.Path = path.Join(u.Path, "pdb/query/v4")
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d := &Discovery{
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url: u.String(),
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port: conf.Port,
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query: conf.Query,
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includeParameters: conf.IncludeParameters,
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client: client,
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}
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d.Discovery = refresh.NewDiscovery(
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logger,
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"http",
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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) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
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body := struct {
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Query string `json:"query"`
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}{d.query}
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bodyBytes, err := json.Marshal(body)
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", d.url, bytes.NewBuffer(bodyBytes))
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if err != nil {
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return nil, err
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}
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req.Header.Set("User-Agent", userAgent)
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req.Header.Set("Accept", "application/json")
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req.Header.Set("Content-Type", "application/json")
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resp, err := d.client.Do(req.WithContext(ctx))
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if err != nil {
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return nil, err
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}
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defer func() {
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io.Copy(io.Discard, resp.Body)
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resp.Body.Close()
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}()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("server returned HTTP status %s", resp.Status)
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}
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if ct := resp.Header.Get("Content-Type"); !matchContentType.MatchString(ct) {
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return nil, fmt.Errorf("unsupported content type %s", resp.Header.Get("Content-Type"))
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}
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b, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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var resources []Resource
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if err := json.Unmarshal(b, &resources); err != nil {
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return nil, err
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}
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tg := &targetgroup.Group{
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// Use a pseudo-URL as source.
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Source: d.url + "?query=" + d.query,
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}
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for _, resource := range resources {
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labels := model.LabelSet{
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pdbLabelQuery: model.LabelValue(d.query),
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pdbLabelCertname: model.LabelValue(resource.Certname),
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pdbLabelResource: model.LabelValue(resource.Resource),
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pdbLabelType: model.LabelValue(resource.Type),
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pdbLabelTitle: model.LabelValue(resource.Title),
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pdbLabelExported: model.LabelValue(fmt.Sprintf("%t", resource.Exported)),
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pdbLabelFile: model.LabelValue(resource.File),
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pdbLabelEnvironment: model.LabelValue(resource.Environment),
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}
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addr := net.JoinHostPort(resource.Certname, strconv.FormatUint(uint64(d.port), 10))
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labels[model.AddressLabel] = model.LabelValue(addr)
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if len(resource.Tags) > 0 {
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// We surround the separated list with the separator as well. This way regular expressions
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// in relabeling rules don't have to consider tag positions.
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tags := separator + strings.Join(resource.Tags, separator) + separator
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labels[pdbLabelTags] = model.LabelValue(tags)
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}
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// Parameters are not included by default. This should only be enabled
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// on select resources as it might expose secrets on the Prometheus UI
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// for certain resources.
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if d.includeParameters {
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for k, v := range resource.Parameters.toLabels() {
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labels[pdbLabelParameter+k] = v
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}
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}
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tg.Targets = append(tg.Targets, labels)
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}
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return []*targetgroup.Group{tg}, nil
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}
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