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stubstatus.go
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/
stubstatus.go
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// Package stubstatus reads server status from nginx host under /server-status, ngx_http_stub_status_module is required.
package stubstatus
import (
"fmt"
"net/http"
"net/url"
"strings"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/metricbeat/mb"
)
const (
// defaultScheme is the default scheme to use when it is not specified in
// the host config.
defaultScheme = "http"
// defaultPath is the default path to the ngx_http_stub_status_module endpoint on Nginx.
defaultPath = "/server-status"
)
var (
debugf = logp.MakeDebug("nginx-status")
)
func init() {
if err := mb.Registry.AddMetricSet("nginx", "stubstatus", New); err != nil {
panic(err)
}
}
// MetricSet for fetching Nginx stub status.
type MetricSet struct {
mb.BaseMetricSet
client *http.Client // HTTP client that is reused across requests.
url string // Nginx stubstatus endpoint URL.
requests int
}
// New creates new instance of MetricSet
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
// Additional configuration options
config := struct {
ServerStatusPath string `config:"server_status_path"`
}{
ServerStatusPath: defaultPath,
}
if err := base.Module().UnpackConfig(&config); err != nil {
return nil, err
}
u, err := getURL(config.ServerStatusPath, base.Host())
if err != nil {
return nil, err
}
debugf("nginx-stubstatus URL=%s", u)
return &MetricSet{
BaseMetricSet: base,
url: u.String(),
client: &http.Client{Timeout: base.Module().Config().Timeout},
requests: 0,
}, nil
}
// Fetch makes an HTTP request to fetch status metrics from the stubstatus endpoint.
func (m *MetricSet) Fetch() (common.MapStr, error) {
req, err := http.NewRequest("GET", m.url, nil)
resp, err := m.client.Do(req)
if err != nil {
return nil, fmt.Errorf("error making http request: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("HTTP error %d: %s", resp.StatusCode, resp.Status)
}
return eventMapping(m, resp.Body, m.Host(), m.Name())
}
// getURL constructs a URL from the rawHost value and path if one was not set in the rawHost value.
func getURL(statusPath, rawHost string) (*url.URL, error) {
u, err := url.Parse(rawHost)
if err != nil {
return nil, fmt.Errorf("error parsing nginx host: %v", err)
}
if u.Scheme == "" {
// Add scheme and re-parse.
u, err = url.Parse(fmt.Sprintf("%s://%s", "http", rawHost))
if err != nil {
return nil, fmt.Errorf("error parsing nginx host: %v", err)
}
}
if u.Host == "" {
return nil, fmt.Errorf("error parsing nginx host: empty host")
}
if u.Path == "" {
// The path given in the host config takes precedence over the
// server_status_path config value.
path := statusPath
if !strings.HasPrefix(path, "/") {
path = "/" + path
}
u.Path = path
}
return u, nil
}