telegraf/plugins/inputs/zookeeper/zookeeper.go

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package zookeeper
import (
"bufio"
"fmt"
"net"
"os"
"regexp"
"strconv"
"strings"
"time"
"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
)
// Zookeeper is a zookeeper plugin
type Zookeeper struct {
Servers []string
}
var sampleConfig = `
## An array of address to gather stats about. Specify an ip or hostname
## with port. ie localhost:2181, 10.0.0.1:2181, etc.
## If no servers are specified, then localhost is used as the host.
## If no port is specified, 2181 is used
servers = [":2181"]
`
var defaultTimeout = time.Second * time.Duration(5)
// SampleConfig returns sample configuration message
func (z *Zookeeper) SampleConfig() string {
return sampleConfig
}
// Description returns description of Zookeeper plugin
func (z *Zookeeper) Description() string {
return `Reads 'mntr' stats from one or many zookeeper servers`
}
// Gather reads stats from all configured servers accumulates stats
func (z *Zookeeper) Gather(acc telegraf.Accumulator) error {
if len(z.Servers) == 0 {
return nil
}
for _, serverAddress := range z.Servers {
if err := z.gatherServer(serverAddress, acc); err != nil {
return err
}
}
return nil
}
func (z *Zookeeper) gatherServer(address string, acc telegraf.Accumulator) error {
var zookeeper_state string
_, _, err := net.SplitHostPort(address)
if err != nil {
address = address + ":2181"
}
c, err := net.DialTimeout("tcp", address, defaultTimeout)
if err != nil {
fmt.Fprintln(os.Stderr, err)
return err
}
defer c.Close()
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// Extend connection
c.SetDeadline(time.Now().Add(defaultTimeout))
fmt.Fprintf(c, "%s\n", "mntr")
rdr := bufio.NewReader(c)
scanner := bufio.NewScanner(rdr)
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service := strings.Split(address, ":")
if len(service) != 2 {
return fmt.Errorf("Invalid service address: %s", address)
}
fields := make(map[string]interface{})
for scanner.Scan() {
line := scanner.Text()
re := regexp.MustCompile(`^zk_(\w+)\s+([\w\.\-]+)`)
parts := re.FindStringSubmatch(string(line))
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if len(parts) != 3 {
return fmt.Errorf("unexpected line in mntr response: %q", line)
}
measurement := strings.TrimPrefix(parts[1], "zk_")
if measurement == "server_state" {
zookeeper_state = parts[2]
} else {
sValue := string(parts[2])
iVal, err := strconv.ParseInt(sValue, 10, 64)
if err == nil {
fields[measurement] = iVal
} else {
fields[measurement] = sValue
}
}
}
tags := map[string]string{
"server": service[0],
"port": service[1],
"state": zookeeper_state,
}
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acc.AddFields("zookeeper", fields, tags)
return nil
}
func init() {
inputs.Add("zookeeper", func() telegraf.Input {
return &Zookeeper{}
})
}