200 lines
7.0 KiB
Go
200 lines
7.0 KiB
Go
package couchdb
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"github.com/influxdata/telegraf"
|
|
"github.com/influxdata/telegraf/plugins/inputs"
|
|
"net/http"
|
|
"reflect"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// Schema:
|
|
type metaData struct {
|
|
Description string `json:"description"`
|
|
Current float64 `json:"current"`
|
|
Sum float64 `json:"sum"`
|
|
Mean float64 `json:"mean"`
|
|
Stddev float64 `json:"stddev"`
|
|
Min float64 `json:"min"`
|
|
Max float64 `json:"max"`
|
|
}
|
|
|
|
type Stats struct {
|
|
Couchdb struct {
|
|
AuthCacheMisses metaData `json:"auth_cache_misses"`
|
|
DatabaseWrites metaData `json:"database_writes"`
|
|
OpenDatabases metaData `json:"open_databases"`
|
|
AuthCacheHits metaData `json:"auth_cache_hits"`
|
|
RequestTime metaData `json:"request_time"`
|
|
DatabaseReads metaData `json:"database_reads"`
|
|
OpenOsFiles metaData `json:"open_os_files"`
|
|
} `json:"couchdb"`
|
|
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"`
|
|
} `json:"httpd_request_methods"`
|
|
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"`
|
|
} `json:"httpd_status_codes"`
|
|
Httpd struct {
|
|
ClientsRequestingChanges metaData `json:"clients_requesting_changes"`
|
|
TemporaryViewReads metaData `json:"temporary_view_reads"`
|
|
Requests metaData `json:"requests"`
|
|
BulkRequests metaData `json:"bulk_requests"`
|
|
ViewReads metaData `json:"view_reads"`
|
|
} `json:"httpd"`
|
|
}
|
|
|
|
type CouchDB struct {
|
|
HOSTs []string `toml:"hosts"`
|
|
}
|
|
|
|
func (*CouchDB) Description() string {
|
|
return "Read CouchDB Stats from one or more servers"
|
|
}
|
|
|
|
func (*CouchDB) SampleConfig() string {
|
|
return `
|
|
## Works with CouchDB stats endpoints out of the box
|
|
## Multiple HOSTs from which to read CouchDB stats:
|
|
hosts = ["http://localhost:8086/_stats"]
|
|
`
|
|
}
|
|
|
|
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]: %s", host, err))
|
|
}
|
|
}(u)
|
|
}
|
|
|
|
wg.Wait()
|
|
|
|
return nil
|
|
}
|
|
|
|
var tr = &http.Transport{
|
|
ResponseHeaderTimeout: time.Duration(3 * time.Second),
|
|
}
|
|
|
|
var client = &http.Client{
|
|
Transport: tr,
|
|
Timeout: time.Duration(4 * time.Second),
|
|
}
|
|
|
|
func (c *CouchDB) fetchAndInsertData(accumulator telegraf.Accumulator, host string) error {
|
|
|
|
response, error := client.Get(host)
|
|
if error != nil {
|
|
return error
|
|
}
|
|
defer response.Body.Close()
|
|
|
|
var stats Stats
|
|
decoder := json.NewDecoder(response.Body)
|
|
decoder.Decode(&stats)
|
|
|
|
fields := map[string]interface{}{}
|
|
|
|
// CouchDB meta stats:
|
|
c.MapCopy(fields, c.generateFields("couchdb_auth_cache_misses", stats.Couchdb.AuthCacheMisses))
|
|
c.MapCopy(fields, c.generateFields("couchdb_database_writes", stats.Couchdb.DatabaseWrites))
|
|
c.MapCopy(fields, c.generateFields("couchdb_open_databases", stats.Couchdb.OpenDatabases))
|
|
c.MapCopy(fields, c.generateFields("couchdb_auth_cache_hits", stats.Couchdb.AuthCacheHits))
|
|
c.MapCopy(fields, c.generateFields("couchdb_request_time", stats.Couchdb.RequestTime))
|
|
c.MapCopy(fields, c.generateFields("couchdb_database_reads", stats.Couchdb.DatabaseReads))
|
|
c.MapCopy(fields, c.generateFields("couchdb_open_os_files", stats.Couchdb.OpenOsFiles))
|
|
|
|
// http request methods stats:
|
|
c.MapCopy(fields, c.generateFields("httpd_request_methods_put", stats.HttpdRequestMethods.Put))
|
|
c.MapCopy(fields, c.generateFields("httpd_request_methods_get", stats.HttpdRequestMethods.Get))
|
|
c.MapCopy(fields, c.generateFields("httpd_request_methods_copy", stats.HttpdRequestMethods.Copy))
|
|
c.MapCopy(fields, c.generateFields("httpd_request_methods_delete", stats.HttpdRequestMethods.Delete))
|
|
c.MapCopy(fields, c.generateFields("httpd_request_methods_post", stats.HttpdRequestMethods.Post))
|
|
c.MapCopy(fields, c.generateFields("httpd_request_methods_head", stats.HttpdRequestMethods.Head))
|
|
|
|
// status code stats:
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_200", stats.HttpdStatusCodes.Status200))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_201", stats.HttpdStatusCodes.Status201))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_202", stats.HttpdStatusCodes.Status202))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_301", stats.HttpdStatusCodes.Status301))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_304", stats.HttpdStatusCodes.Status304))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_400", stats.HttpdStatusCodes.Status400))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_401", stats.HttpdStatusCodes.Status401))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_403", stats.HttpdStatusCodes.Status403))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_404", stats.HttpdStatusCodes.Status404))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_405", stats.HttpdStatusCodes.Status405))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_409", stats.HttpdStatusCodes.Status409))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_412", stats.HttpdStatusCodes.Status412))
|
|
c.MapCopy(fields, c.generateFields("httpd_status_codes_500", stats.HttpdStatusCodes.Status500))
|
|
|
|
// httpd stats:
|
|
c.MapCopy(fields, c.generateFields("httpd_clients_requesting_changes", stats.Httpd.ClientsRequestingChanges))
|
|
c.MapCopy(fields, c.generateFields("httpd_temporary_view_reads", stats.Httpd.TemporaryViewReads))
|
|
c.MapCopy(fields, c.generateFields("httpd_requests", stats.Httpd.Requests))
|
|
c.MapCopy(fields, c.generateFields("httpd_bulk_requests", stats.Httpd.BulkRequests))
|
|
c.MapCopy(fields, c.generateFields("httpd_view_reads", stats.Httpd.ViewReads))
|
|
|
|
tags := map[string]string{
|
|
"server": host,
|
|
}
|
|
accumulator.AddFields("couchdb", fields, tags)
|
|
return nil
|
|
}
|
|
|
|
func (*CouchDB) MapCopy(dst, src interface{}) {
|
|
dv, sv := reflect.ValueOf(dst), reflect.ValueOf(src)
|
|
for _, k := range sv.MapKeys() {
|
|
dv.SetMapIndex(k, sv.MapIndex(k))
|
|
}
|
|
}
|
|
|
|
func (*CouchDB) safeCheck(value interface{}) interface{} {
|
|
if value == nil {
|
|
return 0.0
|
|
}
|
|
return value
|
|
}
|
|
|
|
func (c *CouchDB) generateFields(prefix string, obj metaData) map[string]interface{} {
|
|
fields := map[string]interface{}{
|
|
prefix + "_current": c.safeCheck(obj.Current),
|
|
prefix + "_sum": c.safeCheck(obj.Sum),
|
|
prefix + "_mean": c.safeCheck(obj.Mean),
|
|
prefix + "_stddev": c.safeCheck(obj.Stddev),
|
|
prefix + "_min": c.safeCheck(obj.Min),
|
|
prefix + "_max": c.safeCheck(obj.Max),
|
|
}
|
|
return fields
|
|
}
|
|
|
|
func init() {
|
|
inputs.Add("couchdb", func() telegraf.Input {
|
|
return &CouchDB{}
|
|
})
|
|
}
|