1 files changed, 89 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/modules/logstash/collect.go b/src/go/collectors/go.d.plugin/modules/logstash/collect.go
new file mode 100644
index 000000000..3eceb9bf6
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/logstash/collect.go
@@ -0,0 +1,89 @@
+// 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()
+	}
+}