115 lines
3.6 KiB
Go
115 lines
3.6 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package strutil
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import (
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"fmt"
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"net/url"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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var (
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durationRE = regexp.MustCompile("^([0-9]+)([ywdhms]+)$")
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invalidLabelCharRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
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)
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// DurationToString formats a time.Duration as a string with the assumption that
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// a year always has 365 days and a day always has 24h. (The former doesn't work
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// in leap years, the latter is broken by DST switches, not to speak about leap
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// seconds, but those are not even treated properly by the duration strings in
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// the standard library.)
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func DurationToString(duration time.Duration) string {
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seconds := int64(duration / time.Second)
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factors := map[string]int64{
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"y": 60 * 60 * 24 * 365,
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"d": 60 * 60 * 24,
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"h": 60 * 60,
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"m": 60,
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"s": 1,
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}
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unit := "s"
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switch int64(0) {
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case seconds % factors["y"]:
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unit = "y"
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case seconds % factors["d"]:
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unit = "d"
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case seconds % factors["h"]:
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unit = "h"
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case seconds % factors["m"]:
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unit = "m"
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}
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return fmt.Sprintf("%v%v", seconds/factors[unit], unit)
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}
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// StringToDuration parses a string into a time.Duration, assuming that a year
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// always has 365d, a week 7d, a day 24h. See DurationToString for problems with
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// that.
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func StringToDuration(durationStr string) (duration time.Duration, err error) {
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matches := durationRE.FindStringSubmatch(durationStr)
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if len(matches) != 3 {
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err = fmt.Errorf("not a valid duration string: %q", durationStr)
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return
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}
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durationSeconds, _ := strconv.Atoi(matches[1])
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duration = time.Duration(durationSeconds) * time.Second
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unit := matches[2]
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switch unit {
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case "y":
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duration *= 60 * 60 * 24 * 365
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case "w":
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duration *= 60 * 60 * 24 * 7
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case "d":
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duration *= 60 * 60 * 24
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case "h":
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duration *= 60 * 60
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case "m":
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duration *= 60
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case "s":
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duration *= 1
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default:
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return 0, fmt.Errorf("invalid time unit in duration string: %q", unit)
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}
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return
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}
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// TableLinkForExpression creates an escaped relative link to the table view of
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// the provided expression.
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func TableLinkForExpression(expr string) string {
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// url.QueryEscape percent-escapes everything except spaces, for which it
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// uses "+". However, in the non-query part of a URI, only percent-escaped
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// spaces are legal, so we need to manually replace "+" with "%20" after
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// query-escaping the string.
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//
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// See also:
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// http://stackoverflow.com/questions/1634271/url-encoding-the-space-character-or-20.
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urlData := url.QueryEscape(fmt.Sprintf(`[{"expr":%q,"tab":1}]`, expr))
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return fmt.Sprintf("/graph#%s", strings.Replace(urlData, "+", "%20", -1))
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}
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// GraphLinkForExpression creates an escaped relative link to the graph view of
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// the provided expression.
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func GraphLinkForExpression(expr string) string {
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urlData := url.QueryEscape(fmt.Sprintf(`[{"expr":%q,"tab":0}]`, expr))
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return fmt.Sprintf("/graph#%s", strings.Replace(urlData, "+", "%20", -1))
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}
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// SanitizeLabelName replaces anything that doesn't match
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// client_label.LabelNameRE with an underscore.
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func SanitizeLabelName(name string) string {
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return invalidLabelCharRE.ReplaceAllString(name, "_")
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}
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