158 lines
3.1 KiB
Go
158 lines
3.1 KiB
Go
package nginx
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import (
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"bufio"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/influxdb/telegraf/plugins"
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)
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type Nginx struct {
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Urls []string
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}
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var sampleConfig = `
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# An array of Nginx stub_status URI to gather stats.
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urls = ["http://localhost/status"]`
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func (n *Nginx) SampleConfig() string {
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return sampleConfig
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}
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func (n *Nginx) Description() string {
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return "Read Nginx's basic status information (ngx_http_stub_status_module)"
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}
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func (n *Nginx) Gather(acc plugins.Accumulator) error {
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var wg sync.WaitGroup
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var outerr error
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for _, u := range n.Urls {
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addr, err := url.Parse(u)
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if err != nil {
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return fmt.Errorf("Unable to parse address '%s': %s", u, err)
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}
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wg.Add(1)
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go func(addr *url.URL) {
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defer wg.Done()
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outerr = n.gatherUrl(addr, acc)
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}(addr)
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}
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wg.Wait()
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return outerr
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}
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var tr = &http.Transport{
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ResponseHeaderTimeout: time.Duration(3 * time.Second),
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}
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var client = &http.Client{Transport: tr}
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func (n *Nginx) gatherUrl(addr *url.URL, acc plugins.Accumulator) error {
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resp, err := client.Get(addr.String())
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if err != nil {
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return fmt.Errorf("error making HTTP request to %s: %s", addr.String(), err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("%s returned HTTP status %s", addr.String(), resp.Status)
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}
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r := bufio.NewReader(resp.Body)
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// Active connections
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_, err = r.ReadString(':')
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if err != nil {
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return err
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}
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line, err := r.ReadString('\n')
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if err != nil {
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return err
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}
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active, err := strconv.ParseUint(strings.TrimSpace(line), 10, 64)
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if err != nil {
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return err
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}
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// Server accepts handled requests
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_, err = r.ReadString('\n')
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if err != nil {
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return err
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}
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line, err = r.ReadString('\n')
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if err != nil {
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return err
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}
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data := strings.SplitN(strings.TrimSpace(line), " ", 3)
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accepts, err := strconv.ParseUint(data[0], 10, 64)
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if err != nil {
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return err
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}
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handled, err := strconv.ParseUint(data[1], 10, 64)
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if err != nil {
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return err
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}
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requests, err := strconv.ParseUint(data[2], 10, 64)
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if err != nil {
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return err
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}
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// Reading/Writing/Waiting
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line, err = r.ReadString('\n')
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if err != nil {
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return err
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}
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data = strings.SplitN(strings.TrimSpace(line), " ", 6)
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reading, err := strconv.ParseUint(data[1], 10, 64)
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if err != nil {
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return err
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}
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writing, err := strconv.ParseUint(data[3], 10, 64)
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if err != nil {
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return err
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}
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waiting, err := strconv.ParseUint(data[5], 10, 64)
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if err != nil {
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return err
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}
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tags := getTags(addr)
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acc.Add("active", active, tags)
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acc.Add("accepts", accepts, tags)
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acc.Add("handled", handled, tags)
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acc.Add("requests", requests, tags)
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acc.Add("reading", reading, tags)
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acc.Add("writing", writing, tags)
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acc.Add("waiting", waiting, tags)
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return nil
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}
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// Get tag(s) for the nginx plugin
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func getTags(addr *url.URL) map[string]string {
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h := addr.Host
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var htag string
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if host, _, err := net.SplitHostPort(h); err == nil {
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htag = host
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} else {
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htag = h
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}
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return map[string]string{"server": htag}
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}
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func init() {
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plugins.Add("nginx", func() plugins.Plugin {
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return &Nginx{}
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})
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}
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