telegraf/plugins/inputs/rethinkdb/rethinkdb_server.go

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package rethinkdb
import (
"errors"
"fmt"
"net"
"net/url"
"regexp"
"strconv"
"strings"
"github.com/influxdata/telegraf"
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"gopkg.in/gorethink/gorethink.v3"
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)
type Server struct {
Url *url.URL
session *gorethink.Session
serverStatus serverStatus
}
func (s *Server) gatherData(acc telegraf.Accumulator) error {
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if err := s.getServerStatus(); err != nil {
return fmt.Errorf("Failed to get server_status, %s\n", err)
}
if err := s.validateVersion(); err != nil {
return fmt.Errorf("Failed version validation, %s\n", err.Error())
}
if err := s.addClusterStats(acc); err != nil {
fmt.Printf("error adding cluster stats, %s\n", err.Error())
return fmt.Errorf("Error adding cluster stats, %s\n", err.Error())
}
if err := s.addMemberStats(acc); err != nil {
return fmt.Errorf("Error adding member stats, %s\n", err.Error())
}
if err := s.addTableStats(acc); err != nil {
return fmt.Errorf("Error adding table stats, %s\n", err.Error())
}
return nil
}
func (s *Server) validateVersion() error {
if s.serverStatus.Process.Version == "" {
return errors.New("could not determine the RethinkDB server version: process.version key missing")
}
versionRegexp := regexp.MustCompile("\\d.\\d.\\d")
versionString := versionRegexp.FindString(s.serverStatus.Process.Version)
if versionString == "" {
return fmt.Errorf("could not determine the RethinkDB server version: malformed version string (%v)", s.serverStatus.Process.Version)
}
majorVersion, err := strconv.Atoi(strings.Split(versionString, "")[0])
if err != nil || majorVersion < 2 {
return fmt.Errorf("unsupported major version %s\n", versionString)
}
return nil
}
func (s *Server) getServerStatus() error {
cursor, err := gorethink.DB("rethinkdb").Table("server_status").Run(s.session)
if err != nil {
return err
}
if cursor.IsNil() {
return errors.New("could not determine the RethinkDB server version: no rows returned from the server_status table")
}
defer cursor.Close()
var serverStatuses []serverStatus
err = cursor.All(&serverStatuses)
if err != nil {
return errors.New("could not parse server_status results")
}
host, port, err := net.SplitHostPort(s.Url.Host)
if err != nil {
return fmt.Errorf("unable to determine provided hostname from %s\n", s.Url.Host)
}
driverPort, _ := strconv.Atoi(port)
for _, ss := range serverStatuses {
for _, address := range ss.Network.Addresses {
if address.Host == host && ss.Network.DriverPort == driverPort {
s.serverStatus = ss
return nil
}
}
}
return fmt.Errorf("unable to determine host id from server_status with %s", s.Url.Host)
}
func (s *Server) getDefaultTags() map[string]string {
tags := make(map[string]string)
tags["rethinkdb_host"] = s.Url.Host
tags["rethinkdb_hostname"] = s.serverStatus.Network.Hostname
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return tags
}
var ClusterTracking = []string{
"active_clients",
"clients",
"queries_per_sec",
"read_docs_per_sec",
"written_docs_per_sec",
}
func (s *Server) addClusterStats(acc telegraf.Accumulator) error {
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cursor, err := gorethink.DB("rethinkdb").Table("stats").Get([]string{"cluster"}).Run(s.session)
if err != nil {
return fmt.Errorf("cluster stats query error, %s\n", err.Error())
}
defer cursor.Close()
var clusterStats stats
if err := cursor.One(&clusterStats); err != nil {
return fmt.Errorf("failure to parse cluster stats, %s\n", err.Error())
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}
tags := s.getDefaultTags()
tags["type"] = "cluster"
clusterStats.Engine.AddEngineStats(ClusterTracking, acc, tags)
return nil
}
var MemberTracking = []string{
"active_clients",
"clients",
"queries_per_sec",
"total_queries",
"read_docs_per_sec",
"total_reads",
"written_docs_per_sec",
"total_writes",
}
func (s *Server) addMemberStats(acc telegraf.Accumulator) error {
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cursor, err := gorethink.DB("rethinkdb").Table("stats").Get([]string{"server", s.serverStatus.Id}).Run(s.session)
if err != nil {
return fmt.Errorf("member stats query error, %s\n", err.Error())
}
defer cursor.Close()
var memberStats stats
if err := cursor.One(&memberStats); err != nil {
return fmt.Errorf("failure to parse member stats, %s\n", err.Error())
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}
tags := s.getDefaultTags()
tags["type"] = "member"
memberStats.Engine.AddEngineStats(MemberTracking, acc, tags)
return nil
}
var TableTracking = []string{
"read_docs_per_sec",
"total_reads",
"written_docs_per_sec",
"total_writes",
}
func (s *Server) addTableStats(acc telegraf.Accumulator) error {
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tablesCursor, err := gorethink.DB("rethinkdb").Table("table_status").Run(s.session)
defer tablesCursor.Close()
var tables []tableStatus
err = tablesCursor.All(&tables)
if err != nil {
return errors.New("could not parse table_status results")
}
for _, table := range tables {
cursor, err := gorethink.DB("rethinkdb").Table("stats").
Get([]string{"table_server", table.Id, s.serverStatus.Id}).
Run(s.session)
if err != nil {
return fmt.Errorf("table stats query error, %s\n", err.Error())
}
defer cursor.Close()
var ts tableStats
if err := cursor.One(&ts); err != nil {
return fmt.Errorf("failure to parse table stats, %s\n", err.Error())
}
tags := s.getDefaultTags()
tags["type"] = "data"
tags["ns"] = fmt.Sprintf("%s.%s", table.DB, table.Name)
ts.Engine.AddEngineStats(TableTracking, acc, tags)
ts.Storage.AddStats(acc, tags)
}
return nil
}