/
couchdb.go
291 lines (256 loc) · 10.2 KB
/
couchdb.go
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//go:generate ../../../tools/readme_config_includer/generator
package couchdb
import (
_ "embed"
"encoding/json"
"fmt"
"net/http"
"sync"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
//go:embed sample.conf
var sampleConfig string
type (
metaData struct {
Current *float64 `json:"current"`
Sum *float64 `json:"sum"`
Mean *float64 `json:"mean"`
Stddev *float64 `json:"stddev"`
Min *float64 `json:"min"`
Max *float64 `json:"max"`
Value *float64 `json:"value"`
}
oldValue struct {
Value metaData `json:"value"`
metaData
}
couchdb struct {
AuthCacheHits metaData `json:"auth_cache_hits"`
AuthCacheMisses metaData `json:"auth_cache_misses"`
DatabaseWrites metaData `json:"database_writes"`
DatabaseReads metaData `json:"database_reads"`
OpenDatabases metaData `json:"open_databases"`
OpenOsFiles metaData `json:"open_os_files"`
RequestTime oldValue `json:"request_time"`
HttpdRequestMethods httpdRequestMethods `json:"httpd_request_methods"`
HttpdStatusCodes httpdStatusCodes `json:"httpd_status_codes"`
}
httpdRequestMethods struct {
Put metaData `json:"PUT"`
Get metaData `json:"GET"`
Copy metaData `json:"COPY"`
Delete metaData `json:"DELETE"`
Post metaData `json:"POST"`
Head metaData `json:"HEAD"`
}
httpdStatusCodes struct {
Status200 metaData `json:"200"`
Status201 metaData `json:"201"`
Status202 metaData `json:"202"`
Status301 metaData `json:"301"`
Status304 metaData `json:"304"`
Status400 metaData `json:"400"`
Status401 metaData `json:"401"`
Status403 metaData `json:"403"`
Status404 metaData `json:"404"`
Status405 metaData `json:"405"`
Status409 metaData `json:"409"`
Status412 metaData `json:"412"`
Status500 metaData `json:"500"`
}
httpd struct {
BulkRequests metaData `json:"bulk_requests"`
Requests metaData `json:"requests"`
TemporaryViewReads metaData `json:"temporary_view_reads"`
ViewReads metaData `json:"view_reads"`
ClientsRequestingChanges metaData `json:"clients_requesting_changes"`
}
Stats struct {
Couchdb couchdb `json:"couchdb"`
HttpdRequestMethods httpdRequestMethods `json:"httpd_request_methods"`
HttpdStatusCodes httpdStatusCodes `json:"httpd_status_codes"`
Httpd httpd `json:"httpd"`
}
CouchDB struct {
Hosts []string `toml:"hosts"`
BasicUsername string `toml:"basic_username"`
BasicPassword string `toml:"basic_password"`
client *http.Client
}
)
func (*CouchDB) SampleConfig() string {
return sampleConfig
}
func (c *CouchDB) Gather(accumulator telegraf.Accumulator) error {
var wg sync.WaitGroup
for _, u := range c.Hosts {
wg.Add(1)
go func(host string) {
defer wg.Done()
if err := c.fetchAndInsertData(accumulator, host); err != nil {
accumulator.AddError(fmt.Errorf("[host=%s]: %w", host, err))
}
}(u)
}
wg.Wait()
return nil
}
func (c *CouchDB) fetchAndInsertData(accumulator telegraf.Accumulator, host string) error {
if c.client == nil {
c.client = &http.Client{
Transport: &http.Transport{
ResponseHeaderTimeout: 3 * time.Second,
},
Timeout: 4 * time.Second,
}
}
req, err := http.NewRequest("GET", host, nil)
if err != nil {
return err
}
if c.BasicUsername != "" || c.BasicPassword != "" {
req.SetBasicAuth(c.BasicUsername, c.BasicPassword)
}
response, err := c.client.Do(req)
if err != nil {
return err
}
defer response.Body.Close()
if response.StatusCode != 200 {
return fmt.Errorf("failed to get stats from couchdb: HTTP responded %d", response.StatusCode)
}
stats := Stats{}
decoder := json.NewDecoder(response.Body)
if err := decoder.Decode(&stats); err != nil {
return fmt.Errorf("failed to decode stats from couchdb: HTTP body %q", response.Body)
}
fields := map[string]interface{}{}
// for couchdb 2.0 API changes
requestTime := metaData{
Current: stats.Couchdb.RequestTime.Current,
Sum: stats.Couchdb.RequestTime.Sum,
Mean: stats.Couchdb.RequestTime.Mean,
Stddev: stats.Couchdb.RequestTime.Stddev,
Min: stats.Couchdb.RequestTime.Min,
Max: stats.Couchdb.RequestTime.Max,
}
httpdRequestMethodsPut := stats.HttpdRequestMethods.Put
httpdRequestMethodsGet := stats.HttpdRequestMethods.Get
httpdRequestMethodsCopy := stats.HttpdRequestMethods.Copy
httpdRequestMethodsDelete := stats.HttpdRequestMethods.Delete
httpdRequestMethodsPost := stats.HttpdRequestMethods.Post
httpdRequestMethodsHead := stats.HttpdRequestMethods.Head
httpdStatusCodesStatus200 := stats.HttpdStatusCodes.Status200
httpdStatusCodesStatus201 := stats.HttpdStatusCodes.Status201
httpdStatusCodesStatus202 := stats.HttpdStatusCodes.Status202
httpdStatusCodesStatus301 := stats.HttpdStatusCodes.Status301
httpdStatusCodesStatus304 := stats.HttpdStatusCodes.Status304
httpdStatusCodesStatus400 := stats.HttpdStatusCodes.Status400
httpdStatusCodesStatus401 := stats.HttpdStatusCodes.Status401
httpdStatusCodesStatus403 := stats.HttpdStatusCodes.Status403
httpdStatusCodesStatus404 := stats.HttpdStatusCodes.Status404
httpdStatusCodesStatus405 := stats.HttpdStatusCodes.Status405
httpdStatusCodesStatus409 := stats.HttpdStatusCodes.Status409
httpdStatusCodesStatus412 := stats.HttpdStatusCodes.Status412
httpdStatusCodesStatus500 := stats.HttpdStatusCodes.Status500
// check if couchdb2.0 is used
if stats.Couchdb.HttpdRequestMethods.Get.Value != nil {
requestTime = stats.Couchdb.RequestTime.Value
httpdRequestMethodsPut = stats.Couchdb.HttpdRequestMethods.Put
httpdRequestMethodsGet = stats.Couchdb.HttpdRequestMethods.Get
httpdRequestMethodsCopy = stats.Couchdb.HttpdRequestMethods.Copy
httpdRequestMethodsDelete = stats.Couchdb.HttpdRequestMethods.Delete
httpdRequestMethodsPost = stats.Couchdb.HttpdRequestMethods.Post
httpdRequestMethodsHead = stats.Couchdb.HttpdRequestMethods.Head
httpdStatusCodesStatus200 = stats.Couchdb.HttpdStatusCodes.Status200
httpdStatusCodesStatus201 = stats.Couchdb.HttpdStatusCodes.Status201
httpdStatusCodesStatus202 = stats.Couchdb.HttpdStatusCodes.Status202
httpdStatusCodesStatus301 = stats.Couchdb.HttpdStatusCodes.Status301
httpdStatusCodesStatus304 = stats.Couchdb.HttpdStatusCodes.Status304
httpdStatusCodesStatus400 = stats.Couchdb.HttpdStatusCodes.Status400
httpdStatusCodesStatus401 = stats.Couchdb.HttpdStatusCodes.Status401
httpdStatusCodesStatus403 = stats.Couchdb.HttpdStatusCodes.Status403
httpdStatusCodesStatus404 = stats.Couchdb.HttpdStatusCodes.Status404
httpdStatusCodesStatus405 = stats.Couchdb.HttpdStatusCodes.Status405
httpdStatusCodesStatus409 = stats.Couchdb.HttpdStatusCodes.Status409
httpdStatusCodesStatus412 = stats.Couchdb.HttpdStatusCodes.Status412
httpdStatusCodesStatus500 = stats.Couchdb.HttpdStatusCodes.Status500
}
// CouchDB meta stats:
c.generateFields(fields, "couchdb_auth_cache_misses", stats.Couchdb.AuthCacheMisses)
c.generateFields(fields, "couchdb_database_writes", stats.Couchdb.DatabaseWrites)
c.generateFields(fields, "couchdb_open_databases", stats.Couchdb.OpenDatabases)
c.generateFields(fields, "couchdb_auth_cache_hits", stats.Couchdb.AuthCacheHits)
c.generateFields(fields, "couchdb_request_time", requestTime)
c.generateFields(fields, "couchdb_database_reads", stats.Couchdb.DatabaseReads)
c.generateFields(fields, "couchdb_open_os_files", stats.Couchdb.OpenOsFiles)
// http request methods stats:
c.generateFields(fields, "httpd_request_methods_put", httpdRequestMethodsPut)
c.generateFields(fields, "httpd_request_methods_get", httpdRequestMethodsGet)
c.generateFields(fields, "httpd_request_methods_copy", httpdRequestMethodsCopy)
c.generateFields(fields, "httpd_request_methods_delete", httpdRequestMethodsDelete)
c.generateFields(fields, "httpd_request_methods_post", httpdRequestMethodsPost)
c.generateFields(fields, "httpd_request_methods_head", httpdRequestMethodsHead)
// status code stats:
c.generateFields(fields, "httpd_status_codes_200", httpdStatusCodesStatus200)
c.generateFields(fields, "httpd_status_codes_201", httpdStatusCodesStatus201)
c.generateFields(fields, "httpd_status_codes_202", httpdStatusCodesStatus202)
c.generateFields(fields, "httpd_status_codes_301", httpdStatusCodesStatus301)
c.generateFields(fields, "httpd_status_codes_304", httpdStatusCodesStatus304)
c.generateFields(fields, "httpd_status_codes_400", httpdStatusCodesStatus400)
c.generateFields(fields, "httpd_status_codes_401", httpdStatusCodesStatus401)
c.generateFields(fields, "httpd_status_codes_403", httpdStatusCodesStatus403)
c.generateFields(fields, "httpd_status_codes_404", httpdStatusCodesStatus404)
c.generateFields(fields, "httpd_status_codes_405", httpdStatusCodesStatus405)
c.generateFields(fields, "httpd_status_codes_409", httpdStatusCodesStatus409)
c.generateFields(fields, "httpd_status_codes_412", httpdStatusCodesStatus412)
c.generateFields(fields, "httpd_status_codes_500", httpdStatusCodesStatus500)
// httpd stats:
c.generateFields(fields, "httpd_clients_requesting_changes", stats.Httpd.ClientsRequestingChanges)
c.generateFields(fields, "httpd_temporary_view_reads", stats.Httpd.TemporaryViewReads)
c.generateFields(fields, "httpd_requests", stats.Httpd.Requests)
c.generateFields(fields, "httpd_bulk_requests", stats.Httpd.BulkRequests)
c.generateFields(fields, "httpd_view_reads", stats.Httpd.ViewReads)
tags := map[string]string{
"server": host,
}
accumulator.AddFields("couchdb", fields, tags)
return nil
}
func (c *CouchDB) generateFields(fields map[string]interface{}, prefix string, obj metaData) {
if obj.Value != nil {
fields[prefix+"_value"] = *obj.Value
}
if obj.Current != nil {
fields[prefix+"_current"] = *obj.Current
}
if obj.Sum != nil {
fields[prefix+"_sum"] = *obj.Sum
}
if obj.Mean != nil {
fields[prefix+"_mean"] = *obj.Mean
}
if obj.Stddev != nil {
fields[prefix+"_stddev"] = *obj.Stddev
}
if obj.Min != nil {
fields[prefix+"_min"] = *obj.Min
}
if obj.Max != nil {
fields[prefix+"_max"] = *obj.Max
}
}
func init() {
inputs.Add("couchdb", func() telegraf.Input {
return &CouchDB{
client: &http.Client{
Transport: &http.Transport{
ResponseHeaderTimeout: 3 * time.Second,
},
Timeout: 4 * time.Second,
},
}
})
}