package nginx import ( "bufio" "fmt" "net" "net/http" "net/url" "strconv" "strings" "sync" "time" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/internal/errchan" "github.com/influxdata/telegraf/plugins/inputs" ) type Nginx struct { Urls []string } var sampleConfig = ` ## An array of Nginx stub_status URI to gather stats. urls = ["http://localhost/status"] ` func (n *Nginx) SampleConfig() string { return sampleConfig } func (n *Nginx) Description() string { return "Read Nginx's basic status information (ngx_http_stub_status_module)" } func (n *Nginx) Gather(acc telegraf.Accumulator) error { var wg sync.WaitGroup errChan := errchan.New(len(n.Urls)) 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() errChan.C <- n.gatherUrl(addr, acc) }(addr) } wg.Wait() return errChan.Error() } var tr = &http.Transport{ ResponseHeaderTimeout: time.Duration(3 * time.Second), } var client = &http.Client{ Transport: tr, Timeout: time.Duration(4 * time.Second), } func (n *Nginx) gatherUrl(addr *url.URL, acc telegraf.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) } r := bufio.NewReader(resp.Body) // Active connections _, err = r.ReadString(':') if err != nil { return err } line, err := r.ReadString('\n') if err != nil { return err } active, err := strconv.ParseUint(strings.TrimSpace(line), 10, 64) if err != nil { return err } // Server accepts handled requests _, err = r.ReadString('\n') if err != nil { return err } line, err = r.ReadString('\n') if err != nil { return err } data := strings.Fields(line) accepts, err := strconv.ParseUint(data[0], 10, 64) if err != nil { return err } handled, err := strconv.ParseUint(data[1], 10, 64) if err != nil { return err } requests, err := strconv.ParseUint(data[2], 10, 64) if err != nil { return err } // Reading/Writing/Waiting line, err = r.ReadString('\n') if err != nil { return err } data = strings.Fields(line) reading, err := strconv.ParseUint(data[1], 10, 64) if err != nil { return err } writing, err := strconv.ParseUint(data[3], 10, 64) if err != nil { return err } waiting, err := strconv.ParseUint(data[5], 10, 64) if err != nil { return err } tags := getTags(addr) fields := map[string]interface{}{ "active": active, "accepts": accepts, "handled": handled, "requests": requests, "reading": reading, "writing": writing, "waiting": waiting, } acc.AddFields("nginx", fields, tags) return nil } // Get tag(s) for the nginx 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 = "" } } return map[string]string{"server": host, "port": port} } func init() { inputs.Add("nginx", func() telegraf.Input { return &Nginx{} }) }