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// SPDX-License-Identifier: GPL-3.0-or-later
package couchdb
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"math"
"net/http"
"strings"
"sync"
"github.com/netdata/netdata/go/go.d.plugin/pkg/stm"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
)
const (
urlPathActiveTasks = "/_active_tasks"
urlPathOverviewStats = "/_node/%s/_stats"
urlPathSystemStats = "/_node/%s/_system"
urlPathDatabases = "/_dbs_info"
httpStatusCodePrefix = "couchdb_httpd_status_codes_"
httpStatusCodePrefixLen = len(httpStatusCodePrefix)
)
func (cdb *CouchDB) collect() (map[string]int64, error) {
ms := cdb.scrapeCouchDB()
if ms.empty() {
return nil, nil
}
collected := make(map[string]int64)
cdb.collectNodeStats(collected, ms)
cdb.collectSystemStats(collected, ms)
cdb.collectActiveTasks(collected, ms)
cdb.collectDBStats(collected, ms)
return collected, nil
}
func (cdb *CouchDB) collectNodeStats(collected map[string]int64, ms *cdbMetrics) {
if !ms.hasNodeStats() {
return
}
for metric, value := range stm.ToMap(ms.NodeStats) {
collected[metric] = value
if strings.HasPrefix(metric, httpStatusCodePrefix) {
code := metric[httpStatusCodePrefixLen:]
collected["couchdb_httpd_status_codes_"+string(code[0])+"xx"] += value
}
}
}
func (cdb *CouchDB) collectSystemStats(collected map[string]int64, ms *cdbMetrics) {
if !ms.hasNodeSystem() {
return
}
for metric, value := range stm.ToMap(ms.NodeSystem) {
collected[metric] = value
}
collected["peak_msg_queue"] = findMaxMQSize(ms.NodeSystem.MessageQueues)
}
func (cdb *CouchDB) collectActiveTasks(collected map[string]int64, ms *cdbMetrics) {
collected["active_tasks_indexer"] = 0
collected["active_tasks_database_compaction"] = 0
collected["active_tasks_replication"] = 0
collected["active_tasks_view_compaction"] = 0
if !ms.hasActiveTasks() {
return
}
for _, task := range ms.ActiveTasks {
collected["active_tasks_"+task.Type]++
}
}
func (cdb *CouchDB) collectDBStats(collected map[string]int64, ms *cdbMetrics) {
if !ms.hasDBStats() {
return
}
for _, dbStats := range ms.DBStats {
if dbStats.Error != "" {
cdb.Warning("database '", dbStats.Key, "' doesn't exist")
continue
}
merge(collected, stm.ToMap(dbStats.Info), "db_"+dbStats.Key)
}
}
func (cdb *CouchDB) scrapeCouchDB() *cdbMetrics {
ms := &cdbMetrics{}
wg := &sync.WaitGroup{}
wg.Add(1)
go func() { defer wg.Done(); cdb.scrapeNodeStats(ms) }()
wg.Add(1)
go func() { defer wg.Done(); cdb.scrapeSystemStats(ms) }()
wg.Add(1)
go func() { defer wg.Done(); cdb.scrapeActiveTasks(ms) }()
if len(cdb.databases) > 0 {
wg.Add(1)
go func() { defer wg.Done(); cdb.scrapeDBStats(ms) }()
}
wg.Wait()
return ms
}
func (cdb *CouchDB) scrapeNodeStats(ms *cdbMetrics) {
req, _ := web.NewHTTPRequest(cdb.Request)
req.URL.Path = fmt.Sprintf(urlPathOverviewStats, cdb.Config.Node)
var stats cdbNodeStats
if err := cdb.doOKDecode(req, &stats); err != nil {
cdb.Warning(err)
return
}
ms.NodeStats = &stats
}
func (cdb *CouchDB) scrapeSystemStats(ms *cdbMetrics) {
req, _ := web.NewHTTPRequest(cdb.Request)
req.URL.Path = fmt.Sprintf(urlPathSystemStats, cdb.Config.Node)
var stats cdbNodeSystem
if err := cdb.doOKDecode(req, &stats); err != nil {
cdb.Warning(err)
return
}
ms.NodeSystem = &stats
}
func (cdb *CouchDB) scrapeActiveTasks(ms *cdbMetrics) {
req, _ := web.NewHTTPRequest(cdb.Request)
req.URL.Path = urlPathActiveTasks
var stats []cdbActiveTask
if err := cdb.doOKDecode(req, &stats); err != nil {
cdb.Warning(err)
return
}
ms.ActiveTasks = stats
}
func (cdb *CouchDB) scrapeDBStats(ms *cdbMetrics) {
req, _ := web.NewHTTPRequest(cdb.Request)
req.URL.Path = urlPathDatabases
req.Method = http.MethodPost
req.Header.Add("Accept", "application/json")
req.Header.Add("Content-Type", "application/json")
var q struct {
Keys []string `json:"keys"`
}
q.Keys = cdb.databases
body, err := json.Marshal(q)
if err != nil {
cdb.Error(err)
return
}
req.Body = io.NopCloser(bytes.NewReader(body))
var stats []cdbDBStats
if err := cdb.doOKDecode(req, &stats); err != nil {
cdb.Warning(err)
return
}
ms.DBStats = stats
}
func findMaxMQSize(MessageQueues map[string]interface{}) int64 {
var max float64
for _, mq := range MessageQueues {
switch mqSize := mq.(type) {
case float64:
max = math.Max(max, mqSize)
case map[string]interface{}:
if v, ok := mqSize["count"].(float64); ok {
max = math.Max(max, v)
}
}
}
return int64(max)
}
func (cdb *CouchDB) pingCouchDB() error {
req, _ := web.NewHTTPRequest(cdb.Request)
var info struct{ Couchdb string }
if err := cdb.doOKDecode(req, &info); err != nil {
return err
}
if info.Couchdb != "Welcome" {
return errors.New("not a CouchDB endpoint")
}
return nil
}
func (cdb *CouchDB) doOKDecode(req *http.Request, in interface{}) error {
resp, err := cdb.httpClient.Do(req)
if err != nil {
return fmt.Errorf("error on HTTP request '%s': %v", req.URL, err)
}
defer closeBody(resp)
// TODO: read resp body, it contains reason
// ex.: {"error":"bad_request","reason":"`keys` member must exist."} (400)
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("'%s' returned HTTP status code: %d", req.URL, resp.StatusCode)
}
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()
}
}
func merge(dst, src map[string]int64, prefix string) {
for k, v := range src {
dst[prefix+"_"+k] = v
}
}
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