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// SPDX-License-Identifier: GPL-3.0-or-later
package dnsdist
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"github.com/netdata/netdata/go/go.d.plugin/pkg/stm"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
)
const (
urlPathJSONStat = "/jsonstat"
)
func (d *DNSdist) collect() (map[string]int64, error) {
statistics, err := d.scrapeStatistics()
if err != nil {
return nil, err
}
collected := make(map[string]int64)
d.collectStatistic(collected, statistics)
return collected, nil
}
func (d *DNSdist) collectStatistic(collected map[string]int64, statistics *statisticMetrics) {
for metric, value := range stm.ToMap(statistics) {
collected[metric] = value
}
}
func (d *DNSdist) scrapeStatistics() (*statisticMetrics, error) {
req, _ := web.NewHTTPRequest(d.Request)
req.URL.Path = urlPathJSONStat
req.URL.RawQuery = url.Values{"command": []string{"stats"}}.Encode()
var statistics statisticMetrics
if err := d.doOKDecode(req, &statistics); err != nil {
return nil, err
}
return &statistics, nil
}
func (d *DNSdist) doOKDecode(req *http.Request, in interface{}) error {
resp, err := d.httpClient.Do(req)
if err != nil {
return fmt.Errorf("error on HTTP request '%s': %v", req.URL, err)
}
defer closeBody(resp)
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("'%s' returned HTTP status code: %d", req.URL, resp.StatusCode)
}
if err := json.NewDecoder(resp.Body).Decode(in); err != nil {
return fmt.Errorf("error on decoding response from '%s': %v", req.URL, err)
}
return nil
}
func closeBody(resp *http.Response) {
if resp != nil && resp.Body != nil {
_, _ = io.Copy(io.Discard, resp.Body)
_ = resp.Body.Close()
}
}
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