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// SPDX-License-Identifier: GPL-3.0-or-later
package logstash
import (
"encoding/json"
"fmt"
"io"
"net/http"
"github.com/netdata/netdata/go/go.d.plugin/pkg/stm"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
)
const urlPathNodeStatsAPI = "/_node/stats"
func (l *Logstash) collect() (map[string]int64, error) {
stats, err := l.queryNodeStats()
if err != nil {
return nil, err
}
l.updateCharts(stats.Pipelines)
return stm.ToMap(stats), nil
}
func (l *Logstash) updateCharts(pipelines map[string]pipelineStats) {
seen := make(map[string]bool)
for id := range pipelines {
seen[id] = true
if !l.pipelines[id] {
l.pipelines[id] = true
l.addPipelineCharts(id)
}
}
for id := range l.pipelines {
if !seen[id] {
delete(l.pipelines, id)
l.removePipelineCharts(id)
}
}
}
func (l *Logstash) queryNodeStats() (*nodeStats, error) {
req, _ := web.NewHTTPRequest(l.Request.Copy())
req.URL.Path = urlPathNodeStatsAPI
var stats nodeStats
if err := l.doWithDecode(&stats, req); err != nil {
return nil, err
}
return &stats, nil
}
func (l *Logstash) doWithDecode(dst interface{}, req *http.Request) error {
l.Debugf("executing %s '%s'", req.Method, req.URL)
resp, err := l.httpClient.Do(req)
if err != nil {
return err
}
defer closeBody(resp)
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s returned %d status code (%s)", req.URL, resp.StatusCode, resp.Status)
}
content, err := io.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("error on reading response from %s : %v", req.URL, err)
}
if err := json.Unmarshal(content, dst); err != nil {
return fmt.Errorf("error on parsing 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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