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gearmand.go
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gearmand.go
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package main
import (
"bufio"
"crypto/md5"
"errors"
"flag"
"fmt"
"io"
"net"
"strconv"
"strings"
mp "github.com/mackerelio/go-mackerel-plugin-helper"
)
const nullPrefix = "-"
var graphdef = map[string](mp.Graphs){
"gearmand.queue.#": mp.Graphs{
Label: "Gearmand Queue",
Unit: "integer",
Metrics: [](mp.Metrics){
mp.Metrics{Name: "available", Label: "Available", Diff: false, Stacked: false},
mp.Metrics{Name: "running", Label: "Running", Diff: false, Stacked: false},
mp.Metrics{Name: "total", Label: "Total", Diff: false, Stacked: false},
},
},
}
type gearmandFunction struct {
function string
available uint32
running uint32
total uint32
}
func (f *gearmandFunction) key(key string) string {
return "gearmand.queue." + f.name() + "." + key
}
func (f *gearmandFunction) name() string {
name := f.function
// XXX: escape invalid characters
// Characters which can be used in custom metric names include any alphanumeric characters as well as hyphens (-), underscores (_), and dots (.).
name = strings.Replace(name, "\t", "-", -1)
name = strings.Replace(name, ":", "-", -1)
name = strings.Replace(name, "+", "-", -1)
name = strings.Replace(name, "=", "-", -1)
name = strings.Replace(name, "#", "-", -1)
name = strings.Replace(name, "$", "-", -1)
return name
}
// GearmandPlugin mackerel plugin for gearmand
type GearmandPlugin struct {
Target string
Socket string
Tempfile string
}
func (m GearmandPlugin) connect() (net.Conn, error) {
network := "tcp"
target := m.Target
if m.Socket != "" {
network = "unix"
target = m.Socket
}
return net.Dial(network, target)
}
// FetchMetrics interface for mackerelplugin
func (m GearmandPlugin) FetchMetrics() (map[string]interface{}, error) {
conn, err := m.connect()
if err != nil {
return nil, err
}
fmt.Fprintln(conn, "status")
return m.parseStats(conn)
}
func (m GearmandPlugin) parseStats(conn io.Reader) (map[string]interface{}, error) {
scanner := bufio.NewScanner(conn)
stat := make(map[string]interface{})
for scanner.Scan() {
line := scanner.Text()
if line == "." {
return stat, nil
}
function, err := parseLine(line)
if err != nil {
return nil, err
}
stat[function.key("available")] = function.available
stat[function.key("running")] = function.running
stat[function.key("total")] = function.total
}
if err := scanner.Err(); err != nil {
return stat, err
}
return nil, nil
}
func parseLine(line string) (*gearmandFunction, error) {
// format: FUNCTION\tTOTAL\tRUNNING\tAVAILABLE_WORKERS
// XXX: function may include some tab characters
res := reverse(strings.Split(line, "\t"))
if len(res) < 4 {
return nil, errors.New("Invalid format: " + line)
}
available, err := strconv.ParseUint(res[0], 10, 32)
if err != nil {
return nil, err
}
running, err := strconv.ParseUint(res[1], 10, 32)
if err != nil {
return nil, err
}
total, err := strconv.ParseUint(res[2], 10, 32)
if err != nil {
return nil, err
}
name := strings.Join(reverse(res[3:]), "\t")
return &gearmandFunction{
function: name,
available: uint32(available),
running: uint32(running),
total: uint32(total),
}, nil
}
func reverse(src []string) []string {
length := len(src)
dest := make([]string, length)
for i, v := range src {
dest[length-i-1] = v
}
return dest
}
// GraphDefinition interface for mackerelplugin
func (m GearmandPlugin) GraphDefinition() map[string](mp.Graphs) {
return graphdef
}
func main() {
optHost := flag.String("host", "localhost", "Hostname")
optPort := flag.String("port", "7003", "Port")
optSocket := flag.String("socket", "", "Server socket (overrides hosts and port)")
optTempfile := flag.String("tempfile", "", "Temp file name")
flag.Parse()
var gearmand GearmandPlugin
if *optSocket != "" {
gearmand.Socket = *optSocket
} else {
gearmand.Target = fmt.Sprintf("%s:%s", *optHost, *optPort)
}
helper := mp.NewMackerelPlugin(gearmand)
if *optTempfile != "" {
helper.Tempfile = *optTempfile
} else {
if gearmand.Socket != "" {
helper.Tempfile = fmt.Sprintf("/tmp/mackerel-plugin-gearmand-%s", fmt.Sprintf("%x", md5.Sum([]byte(gearmand.Socket))))
} else {
helper.Tempfile = fmt.Sprintf("/tmp/mackerel-plugin-gearmand-%s-%s", *optHost, *optPort)
}
}
helper.Run()
}