firehol/netdata

// SPDX-License-Identifier: GPL-3.0-or-later

package logstash

import (
    "fmt"

    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/stm"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/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, err := web.NewHTTPRequestWithPath(l.RequestConfig, urlPathNodeStatsAPI)
    if err != nil {
        return nil, fmt.Errorf("failed to create HTTP request: %w", err)
    }

    var stats nodeStats

    if err := web.DoHTTP(l.httpClient).RequestJSON(req, &stats); err != nil {
        return nil, err
    }

    return &stats, nil
}