telegraf/plugins/mysql/mysql.go

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package mysql
import (
"database/sql"
"strconv"
"strings"
_ "github.com/go-sql-driver/mysql"
"github.com/influxdb/telegraf/plugins"
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)
type Mysql struct {
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Servers []string
}
var sampleConfig = `
# specify servers via a url matching:
# [username[:password]@][protocol[(address)]]/[?tls=[true|false|skip-verify]]
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# e.g. root:root@http://10.0.0.18/?tls=false
#
# If no servers are specified, then localhost is used as the host.
servers = ["localhost"]`
func (m *Mysql) SampleConfig() string {
return sampleConfig
}
func (m *Mysql) Description() string {
return "Read metrics from one or many mysql servers"
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}
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var localhost = ""
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func (m *Mysql) Gather(acc plugins.Accumulator) error {
if len(m.Servers) == 0 {
// if we can't get stats in this case, thats fine, don't report
// an error.
m.gatherServer(localhost, acc)
return nil
}
for _, serv := range m.Servers {
err := m.gatherServer(serv, acc)
if err != nil {
return err
}
}
return nil
}
type mapping struct {
onServer string
inExport string
}
var mappings = []*mapping{
{
onServer: "Bytes_",
inExport: "bytes_",
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},
{
onServer: "Com_",
inExport: "commands_",
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},
{
onServer: "Handler_",
inExport: "handler_",
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},
{
onServer: "Innodb_",
inExport: "innodb_",
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},
{
onServer: "Threads_",
inExport: "threads_",
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},
}
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func (m *Mysql) gatherServer(serv string, acc plugins.Accumulator) error {
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if serv == "localhost" {
serv = ""
}
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db, err := sql.Open("mysql", serv)
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if err != nil {
return err
}
defer db.Close()
rows, err := db.Query(`SHOW /*!50002 GLOBAL */ STATUS`)
if err != nil {
return nil
}
for rows.Next() {
var name string
var val interface{}
err = rows.Scan(&name, &val)
if err != nil {
return err
}
var found bool
for _, mapped := range mappings {
if strings.HasPrefix(name, mapped.onServer) {
i, _ := strconv.Atoi(string(val.([]byte)))
acc.Add(mapped.inExport+name[len(mapped.onServer):], i, nil)
found = true
}
}
if found {
continue
}
switch name {
case "Queries":
i, err := strconv.ParseInt(string(val.([]byte)), 10, 64)
if err != nil {
return err
}
acc.Add("queries", i, nil)
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case "Slow_queries":
i, err := strconv.ParseInt(string(val.([]byte)), 10, 64)
if err != nil {
return err
}
acc.Add("slow_queries", i, nil)
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}
}
return nil
}
func init() {
plugins.Add("mysql", func() plugins.Plugin {
return &Mysql{}
})
}