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50 lines
1.3 KiB
50 lines
1.3 KiB
// Copyright 2017, OpenCensus Authors |
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// |
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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 internal |
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import ( |
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"strings" |
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"unicode" |
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) |
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const labelKeySizeLimit = 100 |
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// Sanitize returns a string that is trunacated to 100 characters if it's too |
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// long, and replaces non-alphanumeric characters to underscores. |
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func Sanitize(s string) string { |
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if len(s) == 0 { |
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return s |
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} |
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if len(s) > labelKeySizeLimit { |
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s = s[:labelKeySizeLimit] |
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} |
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s = strings.Map(sanitizeRune, s) |
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if unicode.IsDigit(rune(s[0])) { |
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s = "key_" + s |
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} |
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if s[0] == '_' { |
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s = "key" + s |
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} |
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return s |
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} |
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// converts anything that is not a letter or digit to an underscore |
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func sanitizeRune(r rune) rune { |
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if unicode.IsLetter(r) || unicode.IsDigit(r) { |
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return r |
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} |
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// Everything else turns into an underscore |
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return '_' |
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}
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