misc.go

package main

import (
	"fmt"
	"net/http"
	"net/url"
	"strconv"
)

func getPrometheusTimeout(r *http.Request, defaultTimeout float64) (timeout float64, err error) {
	// If a timeout is configured via the Prometheus header, add it to the request.
	if v := r.Header.Get("X-Prometheus-Scrape-Timeout-Seconds"); v != "" {
		timeout, err = strconv.ParseFloat(v, 64)
		if err != nil {
			return
		}
	}
	if timeout == 0 {
		timeout = defaultTimeout
	}

	return
}

func paramsGetRequired(params url.Values, name string) (value string, err error) {
	value = params.Get(name)
	if value == "" {
		err = fmt.Errorf("parameter \"%v\" is missing", name)
	}

	return
}

func paramsGet(params url.Values, name string) (value string) {
	return params.Get(name)
}

func paramsGetInt(params url.Values, name string) (ret *int, err error) {
	if val := paramsGet(params, name); val != "" {
		if i, err := strconv.ParseInt(val, 10, 64); err == nil {
			i := int(i)
			return &i, nil
		} else {
			return nil, fmt.Errorf(`unable to parse param "%v" with value "%v" as integer: %w`, name, val, err)
		}
	}

	return nil, nil
}