mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-25 05:34:05 -08:00
106 lines
3.3 KiB
Go
106 lines
3.3 KiB
Go
// Copyright 2013 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package strutil
|
|
|
|
import (
|
|
"fmt"
|
|
"net/url"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
var durationRE = regexp.MustCompile("^([0-9]+)([ywdhms]+)$")
|
|
|
|
// DurationToString formats a time.Duration as a string with the assumption that
|
|
// a year always has 365 days and a day always has 24h. (The former doesn't work
|
|
// in leap years, the latter is broken by DST switches, not to speak about leap
|
|
// seconds, but those are not even treated properly by the duration strings in
|
|
// the standard library.)
|
|
func DurationToString(duration time.Duration) string {
|
|
seconds := int64(duration / time.Second)
|
|
factors := map[string]int64{
|
|
"y": 60 * 60 * 24 * 365,
|
|
"d": 60 * 60 * 24,
|
|
"h": 60 * 60,
|
|
"m": 60,
|
|
"s": 1,
|
|
}
|
|
unit := "s"
|
|
switch int64(0) {
|
|
case seconds % factors["y"]:
|
|
unit = "y"
|
|
case seconds % factors["d"]:
|
|
unit = "d"
|
|
case seconds % factors["h"]:
|
|
unit = "h"
|
|
case seconds % factors["m"]:
|
|
unit = "m"
|
|
}
|
|
return fmt.Sprintf("%v%v", seconds/factors[unit], unit)
|
|
}
|
|
|
|
// StringToDuration parses a string into a time.Duration, assuming that a year
|
|
// always has 365d, a week 7d, a day 24h. See DurationToString for problems with
|
|
// that.
|
|
func StringToDuration(durationStr string) (duration time.Duration, err error) {
|
|
matches := durationRE.FindStringSubmatch(durationStr)
|
|
if len(matches) != 3 {
|
|
err = fmt.Errorf("not a valid duration string: %q", durationStr)
|
|
return
|
|
}
|
|
durationSeconds, _ := strconv.Atoi(matches[1])
|
|
duration = time.Duration(durationSeconds) * time.Second
|
|
unit := matches[2]
|
|
switch unit {
|
|
case "y":
|
|
duration *= 60 * 60 * 24 * 365
|
|
case "w":
|
|
duration *= 60 * 60 * 24 * 7
|
|
case "d":
|
|
duration *= 60 * 60 * 24
|
|
case "h":
|
|
duration *= 60 * 60
|
|
case "m":
|
|
duration *= 60
|
|
case "s":
|
|
duration *= 1
|
|
default:
|
|
panic("Invalid time unit in duration string.")
|
|
}
|
|
return
|
|
}
|
|
|
|
// TableLinkForExpression creates an escaped relative link to the table view of
|
|
// the provided expression.
|
|
func TableLinkForExpression(expr string) string {
|
|
// url.QueryEscape percent-escapes everything except spaces, for which it
|
|
// uses "+". However, in the non-query part of a URI, only percent-escaped
|
|
// spaces are legal, so we need to manually replace "+" with "%20" after
|
|
// query-escaping the string.
|
|
//
|
|
// See also:
|
|
// http://stackoverflow.com/questions/1634271/url-encoding-the-space-character-or-20.
|
|
urlData := url.QueryEscape(fmt.Sprintf(`[{"expr":%q,"tab":1}]`, expr))
|
|
return fmt.Sprintf("/graph#%s", strings.Replace(urlData, "+", "%20", -1))
|
|
}
|
|
|
|
// GraphLinkForExpression creates an escaped relative link to the graph view of
|
|
// the provided expression.
|
|
func GraphLinkForExpression(expr string) string {
|
|
urlData := url.QueryEscape(fmt.Sprintf(`[{"expr":%q,"tab":0}]`, expr))
|
|
return fmt.Sprintf("/graph#%s", strings.Replace(urlData, "+", "%20", -1))
|
|
}
|