telegraf/plugins/inputs/apache/apache.go

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package apache
import (
"bufio"
"fmt"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"time"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
type Apache struct {
Urls []string
}
var sampleConfig = `
# An array of Apache status URI to gather stats.
urls = ["http://localhost/server-status?auto"]
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`
func (n *Apache) SampleConfig() string {
return sampleConfig
}
func (n *Apache) Description() string {
return "Read Apache status information (mod_status)"
}
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func (n *Apache) Gather(acc inputs.Accumulator) error {
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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}
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func (n *Apache) gatherUrl(addr *url.URL, acc inputs.Accumulator) error {
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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)
}
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tags := getTags(addr)
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sc := bufio.NewScanner(resp.Body)
fields := make(map[string]interface{})
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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":
for field, value := range n.gatherScores(part) {
fields[field] = value
}
default:
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value, err := strconv.ParseFloat(part, 64)
if err != nil {
continue
}
fields[key] = value
}
}
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}
acc.AddFields("apache", fields, tags)
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return nil
}
func (n *Apache) gatherScores(data string) map[string]interface{} {
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++
}
}
fields := map[string]interface{}{
"scboard_waiting": float64(waiting),
"scboard_starting": float64(S),
"scboard_reading": float64(R),
"scboard_sending": float64(W),
"scboard_keepalive": float64(K),
"scboard_dnslookup": float64(D),
"scboard_closing": float64(C),
"scboard_logging": float64(L),
"scboard_finishing": float64(G),
"scboard_idle_cleanup": float64(I),
"scboard_open": float64(open),
}
return fields
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}
// Get tag(s) for the apache plugin
func getTags(addr *url.URL) map[string]string {
h := addr.Host
host, port, err := net.SplitHostPort(h)
if err != nil {
host = addr.Host
if addr.Scheme == "http" {
port = "80"
} else if addr.Scheme == "https" {
port = "443"
} else {
port = ""
}
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}
return map[string]string{"server": host, "port": port}
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}
func init() {
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inputs.Add("apache", func() inputs.Input {
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return &Apache{}
})
}