mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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77 lines
2.6 KiB
Go
77 lines
2.6 KiB
Go
package kubernetes
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import (
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"fmt"
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"net"
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"os"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
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)
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// apiConfig contains config for API server
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type apiConfig struct {
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client *discoveryutils.Client
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namespaces []string
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selectors []Selector
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}
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var configMap = discoveryutils.NewConfigMap()
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func getAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
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v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(sdc, baseDir) })
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if err != nil {
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return nil, err
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}
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return v.(*apiConfig), nil
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}
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func newAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
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ac, err := promauth.NewConfig(baseDir, sdc.BasicAuth, sdc.BearerToken, sdc.BearerTokenFile, sdc.TLSConfig)
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if err != nil {
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return nil, fmt.Errorf("cannot parse auth config: %s", err)
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}
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apiServer := sdc.APIServer
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if len(apiServer) == 0 {
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// Assume we run at k8s pod.
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// Discover apiServer and auth config according to k8s docs.
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// See https://kubernetes.io/docs/reference/access-authn-authz/service-accounts-admin/#service-account-admission-controller
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host := os.Getenv("KUBERNETES_SERVICE_HOST")
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port := os.Getenv("KUBERNETES_SERVICE_PORT")
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if len(host) == 0 {
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return nil, fmt.Errorf("cannot find KUBERNETES_SERVICE_HOST env var; it must be defined when running in k8s; " +
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"probably, `kubernetes_sd_config->api_server` is missing in Prometheus configs?")
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}
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if len(port) == 0 {
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return nil, fmt.Errorf("cannot find KUBERNETES_SERVICE_PORT env var; it must be defined when running in k8s; "+
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"KUBERNETES_SERVICE_HOST=%q", host)
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}
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apiServer = "https://" + net.JoinHostPort(host, port)
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tlsConfig := promauth.TLSConfig{
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CAFile: "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt",
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}
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acNew, err := promauth.NewConfig("/", nil, "", "/var/run/secrets/kubernetes.io/serviceaccount/token", &tlsConfig)
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if err != nil {
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return nil, fmt.Errorf("cannot initialize service account auth: %s; probably, `kubernetes_sd_config->api_server` is missing in Prometheus configs?", err)
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}
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ac = acNew
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}
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client, err := discoveryutils.NewClient(apiServer, ac)
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if err != nil {
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return nil, fmt.Errorf("cannot create HTTP client for %q: %s", apiServer, err)
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}
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cfg := &apiConfig{
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client: client,
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namespaces: sdc.Namespaces.Names,
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selectors: sdc.Selectors,
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}
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return cfg, nil
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}
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func getAPIResponse(cfg *apiConfig, role, path string) ([]byte, error) {
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query := joinSelectors(role, cfg.namespaces, cfg.selectors)
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if len(query) > 0 {
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path += "?" + query
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}
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return cfg.client.GetAPIResponse(path)
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}
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