created docker-prometheus compose file and edited the Prometheus yml file

prom/util/strutil/strconv.go

@@ -0,0 +1,114 @@
+// 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]+)$")
+	invalidLabelCharRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
+)
+
+// 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:
+		return 0, fmt.Errorf("invalid time unit in duration string: %q", unit)
+	}
+	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))
+}
+
+// SanitizeLabelName replaces anything that doesn't match
+// client_label.LabelNameRE with an underscore.
+func SanitizeLabelName(name string) string {
+	return invalidLabelCharRE.ReplaceAllString(name, "_")
+}