53 lines
1.9 KiB
Go
53 lines
1.9 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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"strings"
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)
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var (
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invalidLabelCharRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
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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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