65 lines
2.2 KiB
Go
65 lines
2.2 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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"strings"
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"github.com/grafana/regexp"
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)
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var invalidLabelCharRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
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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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escapedExpression := url.QueryEscape(expr)
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return fmt.Sprintf("/graph?g0.expr=%s&g0.tab=1", escapedExpression)
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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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escapedExpression := url.QueryEscape(expr)
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return fmt.Sprintf("/graph?g0.expr=%s&g0.tab=0", escapedExpression)
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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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// Note: this does not handle all Prometheus label name restrictions (such as
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// not starting with a digit 0-9), and hence should only be used if the label
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// name is prefixed with a known valid string.
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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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// SanitizeFullLabelName replaces any invalid character with an underscore, and
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// if given an empty string, returns a string containing a single underscore.
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func SanitizeFullLabelName(name string) string {
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if len(name) == 0 {
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return "_"
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}
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var validSb strings.Builder
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for i, b := range name {
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if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || (b >= '0' && b <= '9' && i > 0)) {
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validSb.WriteRune('_')
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} else {
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validSb.WriteRune(b)
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}
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}
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return validSb.String()
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}
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