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// SPDX-License-Identifier: GPL-3.0-or-later
package rabbitmq
import (
"encoding/json"
"fmt"
"io"
"net/http"
"path/filepath"
"github.com/netdata/netdata/go/go.d.plugin/pkg/stm"
"github.com/netdata/netdata/go/go.d.plugin/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 {
var stats overviewStats
if err := r.doOKDecode(urlPathAPIOverview, &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
}
var stats nodeStats
if err := r.doOKDecode(filepath.Join(urlPathAPINodes, r.nodeName), &stats); err != nil {
return err
}
for k, v := range stm.ToMap(stats) {
mx[k] = v
}
mx["proc_available"] = int64(stats.ProcTotal - stats.ProcUsed)
return nil
}
func (r *RabbitMQ) collectVhostsStats(mx map[string]int64) error {
var stats []vhostStats
if err := r.doOKDecode(urlPathAPIVhosts, &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 {
var stats []queueStats
if err := r.doOKDecode(urlPathAPIQueues, &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
}
func (r *RabbitMQ) doOKDecode(urlPath string, in interface{}) error {
req, err := web.NewHTTPRequest(r.Request.Copy())
if err != nil {
return fmt.Errorf("error on creating request: %v", err)
}
req.URL.Path = urlPath
r.Debugf("doing HTTP %s to '%s'", req.Method, req.URL)
resp, err := r.httpClient.Do(req)
if err != nil {
return fmt.Errorf("error on request to %s: %v", req.URL, err)
}
defer closeBody(resp)
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s returned HTTP status %d (%s)", req.URL, resp.StatusCode, resp.Status)
}
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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