mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
package http
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"strconv"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
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"github.com/VictoriaMetrics/metrics"
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)
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var configMap = discoveryutils.NewConfigMap()
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type apiConfig struct {
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client *discoveryutils.Client
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path string
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fetchErrors *metrics.Counter
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parseErrors *metrics.Counter
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}
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// httpGroupTarget represent prometheus GroupTarget
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// https://prometheus.io/docs/prometheus/latest/http_sd/
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type httpGroupTarget struct {
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Targets []string `json:"targets"`
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Labels *promutils.Labels `json:"labels"`
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}
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func newAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
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ac, err := sdc.HTTPClientConfig.NewConfig(baseDir)
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if err != nil {
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return nil, fmt.Errorf("cannot parse auth config: %w", err)
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}
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parsedURL, err := url.Parse(sdc.URL)
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if err != nil {
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return nil, fmt.Errorf("cannot parse http_sd URL: %w", err)
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}
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apiServer := fmt.Sprintf("%s://%s", parsedURL.Scheme, parsedURL.Host)
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proxyAC, err := sdc.ProxyClientConfig.NewConfig(baseDir)
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if err != nil {
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return nil, fmt.Errorf("cannot parse proxy auth config: %w", err)
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}
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client, err := discoveryutils.NewClient(apiServer, ac, sdc.ProxyURL, proxyAC)
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if err != nil {
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return nil, fmt.Errorf("cannot create HTTP client for %q: %w", apiServer, err)
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}
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cfg := &apiConfig{
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client: client,
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path: parsedURL.RequestURI(),
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fetchErrors: metrics.GetOrCreateCounter(fmt.Sprintf(`promscrape_discovery_http_errors_total{type="fetch",url=%q}`, sdc.URL)),
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parseErrors: metrics.GetOrCreateCounter(fmt.Sprintf(`promscrape_discovery_http_errors_total{type="parse",url=%q}`, sdc.URL)),
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}
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return cfg, nil
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}
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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 getHTTPTargets(cfg *apiConfig) ([]httpGroupTarget, error) {
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data, err := cfg.client.GetAPIResponseWithReqParams(cfg.path, func(request *http.Request) {
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request.Header.Set("X-Prometheus-Refresh-Interval-Seconds", strconv.FormatFloat(SDCheckInterval.Seconds(), 'f', 0, 64))
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request.Header.Set("Accept", "application/json")
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})
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if err != nil {
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cfg.fetchErrors.Inc()
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return nil, fmt.Errorf("cannot read http_sd api response: %w", err)
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}
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tg, err := parseAPIResponse(data, cfg.path)
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if err != nil {
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cfg.parseErrors.Inc()
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return nil, err
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}
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return tg, nil
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}
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func parseAPIResponse(data []byte, path string) ([]httpGroupTarget, error) {
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var r []httpGroupTarget
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if err := json.Unmarshal(data, &r); err != nil {
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return nil, fmt.Errorf("cannot parse http_sd api response path: %s, err: %w", path, err)
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}
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return r, nil
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}
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