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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"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/mb/parse"
)
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")
hostParser = parse.URLHostParserBuilder{
DefaultScheme: defaultScheme,
PathConfigKey: "server_status_path",
DefaultPath: defaultPath,
}.Build()
)
func init() {
if err := mb.Registry.AddMetricSet("nginx", "stubstatus", New, hostParser); 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.
previousNumRequests int // Total number of requests as returned in the previous fetch.
}
// New creates new instance of MetricSet
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
return &MetricSet{
BaseMetricSet: base,
client: &http.Client{Timeout: base.Module().Config().Timeout},
}, 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.HostData().SanitizedURI, nil)
if m.HostData().User != "" || m.HostData().Password != "" {
req.SetBasicAuth(m.HostData().User, m.HostData().Password)
}
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())
}