package nginx import ( "bufio" "fmt" "net" "net/http" "net/url" "strconv" "strings" "sync" "time" "github.com/influxdb/telegraf/plugins" ) 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 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 *Nginx) 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) } 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.SplitN(strings.TrimSpace(line), " ", 3) 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.SplitN(strings.TrimSpace(line), " ", 6) 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) acc.Add("active", active, tags) acc.Add("accepts", accepts, tags) acc.Add("handled", handled, tags) acc.Add("requests", requests, tags) acc.Add("reading", reading, tags) acc.Add("writing", writing, tags) acc.Add("waiting", waiting, tags) return nil } // Get tag(s) for the nginx 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("nginx", func() plugins.Plugin { return &Nginx{} }) }