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promsd.go
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promsd.go
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// Copyright 2018-2024 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package exporters
import (
"encoding/json"
"fmt"
"net/url"
"os"
"path"
"path/filepath"
"strings"
"github.com/cs3org/reva/pkg/mentix/config"
"github.com/cs3org/reva/pkg/mentix/exchangers/exporters/prometheus"
"github.com/cs3org/reva/pkg/mentix/meshdata"
"github.com/cs3org/reva/pkg/mentix/utils"
"github.com/rs/zerolog"
)
type prometheusSDScrapeCreatorCallback = func(op *meshdata.Operator, site *meshdata.Site, service *meshdata.Service, endpoint *meshdata.ServiceEndpoint) *prometheus.ScrapeConfig
type prometheusSDScrapeCreator struct {
outputFilename string
creatorCallback prometheusSDScrapeCreatorCallback
serviceFilter []string
}
// PrometheusSDExporter implements various Prometheus Service Discovery scrape config exporters.
type PrometheusSDExporter struct {
BaseExporter
scrapeCreators map[string]prometheusSDScrapeCreator
}
const (
labelOperatorName = "__meta_mentix_operator"
labelOperatorID = "__meta_mentix_operator_id"
labelSiteName = "__meta_mentix_site"
labelSiteID = "__meta_mentix_site_id"
labelSiteCountry = "__meta_mentix_site_country"
labelType = "__meta_mentix_type"
labelURL = "__meta_mentix_url"
labelScheme = "__meta_mentix_scheme"
labelHost = "__meta_mentix_host"
labelPort = "__meta_mentix_port"
labelPath = "__meta_mentix_path"
labelServiceHost = "__meta_mentix_service_host"
labelServiceURL = "__meta_mentix_service_url"
)
func createGenericScrapeConfig(op *meshdata.Operator, site *meshdata.Site, service *meshdata.Service, endpoint *meshdata.ServiceEndpoint) *prometheus.ScrapeConfig {
endpointURL, _ := url.Parse(endpoint.URL)
labels := getScrapeTargetLabels(op, site, service, endpoint)
return &prometheus.ScrapeConfig{
Targets: []string{endpointURL.Host},
Labels: labels,
}
}
func getScrapeTargetLabels(op *meshdata.Operator, site *meshdata.Site, service *meshdata.Service, endpoint *meshdata.ServiceEndpoint) map[string]string {
endpointURL, _ := url.Parse(endpoint.URL)
labels := map[string]string{
labelOperatorName: op.Name,
labelOperatorID: op.ID,
labelSiteName: site.Name,
labelSiteID: site.ID,
labelSiteCountry: site.CountryCode,
labelType: endpoint.Type.Name,
labelURL: endpoint.URL,
labelScheme: endpointURL.Scheme,
labelHost: endpointURL.Hostname(),
labelPort: endpointURL.Port(),
labelPath: endpointURL.Path,
labelServiceHost: service.Host,
labelServiceURL: service.URL,
}
return labels
}
func (exporter *PrometheusSDExporter) registerScrapeCreators(conf *config.Configuration) error {
exporter.scrapeCreators = make(map[string]prometheusSDScrapeCreator)
registerCreator := func(name string, outputFilename string, creator prometheusSDScrapeCreatorCallback, serviceFilter []string) error {
if len(outputFilename) > 0 { // Only register the creator if an output filename was configured
exporter.scrapeCreators[name] = prometheusSDScrapeCreator{
outputFilename: outputFilename,
creatorCallback: creator,
serviceFilter: serviceFilter,
}
// Create the output directory for the target file so it exists when exporting
if err := os.MkdirAll(filepath.Dir(outputFilename), 0755); err != nil {
return fmt.Errorf("unable to create output directory tree: %v", err)
}
}
return nil
}
// Register all scrape creators
for _, endpoint := range meshdata.GetServiceEndpoints() {
epName := strings.ToLower(endpoint)
filename := path.Join(conf.Exporters.PrometheusSD.OutputPath, "svc_"+epName+".json")
if err := registerCreator(epName, filename, createGenericScrapeConfig, []string{endpoint}); err != nil {
return fmt.Errorf("unable to register the '%v' scrape config creator: %v", epName, err)
}
}
return nil
}
// Activate activates the exporter.
func (exporter *PrometheusSDExporter) Activate(conf *config.Configuration, log *zerolog.Logger) error {
if err := exporter.BaseExporter.Activate(conf, log); err != nil {
return err
}
if err := exporter.registerScrapeCreators(conf); err != nil {
return fmt.Errorf("unable to register the scrape creators: %v", err)
}
// Create all output directories
for _, creator := range exporter.scrapeCreators {
if err := os.MkdirAll(filepath.Dir(creator.outputFilename), 0755); err != nil {
return fmt.Errorf("unable to create directory tree: %v", err)
}
}
// Store PrometheusSD specifics
exporter.SetEnabledConnectors(conf.Exporters.PrometheusSD.EnabledConnectors)
return nil
}
// Update is called whenever the mesh data set has changed to reflect these changes.
func (exporter *PrometheusSDExporter) Update(meshDataSet meshdata.Map) error {
if err := exporter.BaseExporter.Update(meshDataSet); err != nil {
return err
}
// Perform exporting the data asynchronously
go exporter.exportMeshData()
return nil
}
func (exporter *PrometheusSDExporter) exportMeshData() {
// Data is read, so acquire a read lock
exporter.Locker().RLock()
defer exporter.Locker().RUnlock()
for name, creator := range exporter.scrapeCreators {
scrapes := exporter.createScrapeConfigs(creator.creatorCallback, creator.serviceFilter)
if err := exporter.exportScrapeConfig(creator.outputFilename, scrapes); err != nil {
exporter.Log().Err(err).Str("kind", name).Str("file", creator.outputFilename).Msg("error exporting Prometheus SD scrape config")
} else {
exporter.Log().Debug().Str("kind", name).Str("file", creator.outputFilename).Msg("exported Prometheus SD scrape config")
}
}
}
func (exporter *PrometheusSDExporter) createScrapeConfigs(creatorCallback prometheusSDScrapeCreatorCallback, serviceFilter []string) []*prometheus.ScrapeConfig {
var scrapes []*prometheus.ScrapeConfig
var addScrape = func(op *meshdata.Operator, site *meshdata.Site, service *meshdata.Service, endpoint *meshdata.ServiceEndpoint) {
if len(serviceFilter) == 0 || utils.FindInStringArray(endpoint.Type.Name, serviceFilter, false) != -1 {
if scrape := creatorCallback(op, site, service, endpoint); scrape != nil {
scrapes = append(scrapes, scrape)
}
}
}
// Create a scrape config for each service alongside any additional endpoints
for _, op := range exporter.MeshData().Operators {
for _, site := range op.Sites {
for _, service := range site.Services {
if !service.IsMonitored {
continue
}
// Add the "main" service to the scrapes
addScrape(op, site, service, service.ServiceEndpoint)
// Add all additional endpoints as well
for _, endpoint := range service.AdditionalEndpoints {
if endpoint.IsMonitored {
addScrape(op, site, service, endpoint)
}
}
}
}
}
if scrapes == nil {
scrapes = []*prometheus.ScrapeConfig{}
}
return scrapes
}
func (exporter *PrometheusSDExporter) exportScrapeConfig(outputFilename string, v interface{}) error {
// Encode scrape config as JSON
data, err := json.MarshalIndent(v, "", "\t")
if err != nil {
return fmt.Errorf("unable to marshal scrape config: %v", err)
}
// Write the data to disk
if err := os.WriteFile(outputFilename, data, 0755); err != nil {
return fmt.Errorf("unable to write scrape config '%v': %v", outputFilename, err)
}
return nil
}
// GetID returns the ID of the exporter.
func (exporter *PrometheusSDExporter) GetID() string {
return config.ExporterIDPrometheusSD
}
// GetName returns the display name of the exporter.
func (exporter *PrometheusSDExporter) GetName() string {
return "Prometheus SD"
}
func init() {
registerExporter(&PrometheusSDExporter{})
}