telegraf/plugins/apache/apache.go

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2015-08-27 09:24:26 +00:00
package apache
import (
"bufio"
"fmt"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"time"
"github.com/influxdb/telegraf/plugins"
)
type Apache struct {
Urls []string
}
var sampleConfig = `
# An array of Apache status URI to gather stats.
urls = ["http://localhost/server-status?auto"]
`
func (n *Apache) SampleConfig() string {
return sampleConfig
}
func (n *Apache) Description() string {
return "Read Apache status information (mod_status)"
}
func (n *Apache) Gather(acc plugins.Accumulator) error {
var wg sync.WaitGroup
var outerr error
for _, u := range n.Urls {
addr, err := url.Parse(u)
if err != nil {
return fmt.Errorf("Unable to parse address '%s': %s", u, err)
}
wg.Add(1)
go func(addr *url.URL) {
defer wg.Done()
outerr = n.gatherUrl(addr, acc)
}(addr)
}
wg.Wait()
return outerr
}
var tr = &http.Transport{
ResponseHeaderTimeout: time.Duration(3 * time.Second),
}
var client = &http.Client{Transport: tr}
func (n *Apache) gatherUrl(addr *url.URL, acc plugins.Accumulator) error {
resp, err := client.Get(addr.String())
if err != nil {
return fmt.Errorf("error making HTTP request to %s: %s", addr.String(), err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s returned HTTP status %s", addr.String(), resp.Status)
}
tags := getTags(addr)
sc := bufio.NewScanner(resp.Body)
for sc.Scan() {
line := sc.Text()
if strings.Contains(line, ":") {
parts := strings.SplitN(line, ":", 2)
key, part := strings.Replace(parts[0], " ", "", -1), strings.TrimSpace(parts[1])
switch key {
case "Scoreboard":
n.gatherScores(part, acc, tags)
default:
value, err := strconv.ParseFloat(part, 32)
if err != nil {
continue
}
acc.Add(key, value, tags)
}
}
}
return nil
}
func (n *Apache) gatherScores(data string, acc plugins.Accumulator, tags map[string]string) {
var waiting, open int = 0, 0
var S, R, W, K, D, C, L, G, I int = 0, 0, 0, 0, 0, 0, 0, 0, 0
for _, s := range strings.Split(data, "") {
switch s {
case "_": waiting++
case "S": S++
case "R": R++
case "W": W++
case "K": K++
case "D": D++
case "C": C++
case "L": L++
case "G": G++
case "I": I++
case ".": open++
}
}
acc.Add("scboard_waiting", float64(waiting), tags);
acc.Add("scboard_starting", float64(S), tags);
acc.Add("scboard_reading", float64(R), tags);
acc.Add("scboard_sending", float64(W), tags);
acc.Add("scboard_keepalive", float64(K), tags);
acc.Add("scboard_dnslookup", float64(D), tags);
acc.Add("scboard_closing", float64(C), tags);
acc.Add("scboard_logging", float64(L), tags);
acc.Add("scboard_finishing", float64(G), tags);
acc.Add("scboard_idle_cleanup", float64(I), tags);
acc.Add("scboard_open", float64(open), tags);
}
// Get tag(s) for the apache plugin
func getTags(addr *url.URL) map[string]string {
h := addr.Host
var htag string
if host, _, err := net.SplitHostPort(h); err == nil {
htag = host
} else {
htag = h
}
return map[string]string{"server": htag}
}
func init() {
plugins.Add("apache", func() plugins.Plugin {
return &Apache{}
})
}