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metrics.go
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/
metrics.go
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package advanced_metrics
import (
"net/http"
"strconv"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
func init() {
caddy.RegisterModule(AdvancedMetrics{})
httpcaddyfile.RegisterHandlerDirective("advanced_metrics", parseAdvancedMetrics)
}
type AdvancedMetrics struct {
PrometheusPort int
}
func (AdvancedMetrics) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "http.handlers.advanced_metrics",
New: func() caddy.Module { return new(AdvancedMetrics) },
}
}
func (AdvancedMetrics) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
for d.Next() {
if !d.NextArg() {
return d.ArgErr()
}
}
return nil
}
func (am AdvancedMetrics) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
lrw := NewLoggingResponseWriter(w)
next.ServeHTTP(w, r)
HandleRequest(am.PrometheusPort, r.Method, r.URL.Path, lrw.statusCode, r.Host)
return nil
}
func getPort(d *caddyfile.Dispenser) int {
var port int = 6611
for d.Next() {
for d.NextBlock(0) {
switch d.Val() {
case "port":
if d.NextArg() {
i, err := strconv.Atoi(d.Val())
if err == nil {
port = i
}
}
}
}
}
return port
}
func parseAdvancedMetrics(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
port := getPort(h.Dispenser)
StartServer(port)
return AdvancedMetrics{PrometheusPort: port}, nil
}
var (
_ caddyfile.Unmarshaler = (*AdvancedMetrics)(nil)
_ caddyhttp.MiddlewareHandler = (*AdvancedMetrics)(nil)
)