firehol/netdata

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

package rabbitmq

import (
    "fmt"
    "path/filepath"

    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/stm"
    "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/web"
)

const (
    urlPathAPIOverview = "/api/overview"
    urlPathAPINodes    = "/api/nodes/"
    urlPathAPIVhosts   = "/api/vhosts"
    urlPathAPIQueues   = "/api/queues"
)

// TODO: there is built-in prometheus collector since v3.8.0 (https://www.rabbitmq.com/prometheus.html).
// Should use it (in addition?), it is the recommended option  according to the docs.
func (r *RabbitMQ) collect() (map[string]int64, error) {
    mx := make(map[string]int64)

    if err := r.collectOverviewStats(mx); err != nil {
        return nil, err
    }
    if err := r.collectNodeStats(mx); err != nil {
        return mx, err
    }
    if err := r.collectVhostsStats(mx); err != nil {
        return mx, err
    }
    if r.CollectQueues {
        if err := r.collectQueuesStats(mx); err != nil {
            return mx, err
        }
    }

    return mx, nil
}

func (r *RabbitMQ) collectOverviewStats(mx map[string]int64) error {
    req, err := web.NewHTTPRequestWithPath(r.RequestConfig, urlPathAPIOverview)
    if err != nil {
        return fmt.Errorf("failed to create overview stats request: %w", err)
    }

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

    if r.nodeName == "" {
        r.nodeName = stats.Node
    }

    for k, v := range stm.ToMap(stats) {
        mx[k] = v
    }

    return nil
}

func (r *RabbitMQ) collectNodeStats(mx map[string]int64) error {
    if r.nodeName == "" {
        return nil
    }

    req, err := web.NewHTTPRequestWithPath(r.RequestConfig, filepath.Join(urlPathAPINodes, r.nodeName))
    if err != nil {
        return fmt.Errorf("failed to create node stats request: %w", err)
    }

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

    for k, v := range stm.ToMap(stats) {
        mx[k] = v
    }
    mx["proc_available"] = stats.ProcTotal - stats.ProcUsed

    return nil
}

func (r *RabbitMQ) collectVhostsStats(mx map[string]int64) error {
    req, err := web.NewHTTPRequestWithPath(r.RequestConfig, urlPathAPIVhosts)
    if err != nil {
        return fmt.Errorf("failed to create vhosts stats request: %w", err)
    }

    var stats []vhostStats
    if err := web.DoHTTP(r.httpClient).RequestJSON(req, &stats); err != nil {
        return err
    }

    seen := make(map[string]bool)

    for _, vhost := range stats {
        seen[vhost.Name] = true
        for k, v := range stm.ToMap(vhost) {
            mx[fmt.Sprintf("vhost_%s_%s", vhost.Name, k)] = v
        }
    }

    for name := range seen {
        if !r.vhosts[name] {
            r.vhosts[name] = true
            r.Debugf("new vhost name='%s': creating charts", name)
            r.addVhostCharts(name)
        }
    }
    for name := range r.vhosts {
        if !seen[name] {
            delete(r.vhosts, name)
            r.Debugf("stale vhost name='%s': removing charts", name)
            r.removeVhostCharts(name)
        }
    }

    return nil
}

func (r *RabbitMQ) collectQueuesStats(mx map[string]int64) error {
    req, err := web.NewHTTPRequestWithPath(r.RequestConfig, urlPathAPIQueues)
    if err != nil {
        return fmt.Errorf("failed to create queues stats request: %w", err)
    }

    var stats []queueStats
    if err := web.DoHTTP(r.httpClient).RequestJSON(req, &stats); err != nil {
        return err
    }

    seen := make(map[string]queueCache)

    for _, queue := range stats {
        seen[queue.Name+"|"+queue.Vhost] = queueCache{name: queue.Name, vhost: queue.Vhost}
        for k, v := range stm.ToMap(queue) {
            mx[fmt.Sprintf("queue_%s_vhost_%s_%s", queue.Name, queue.Vhost, k)] = v
        }
    }

    for key, queue := range seen {
        if _, ok := r.queues[key]; !ok {
            r.queues[key] = queue
            r.Debugf("new queue name='%s', vhost='%s': creating charts", queue.name, queue.vhost)
            r.addQueueCharts(queue.name, queue.vhost)
        }
    }
    for key, queue := range r.queues {
        if _, ok := seen[key]; !ok {
            delete(r.queues, key)
            r.Debugf("stale queue name='%s', vhost='%s': removing charts", queue.name, queue.vhost)
            r.removeQueueCharts(queue.name, queue.vhost)
        }
    }

    return nil
}