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rewrite.go
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rewrite.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package influxdb
import (
"regexp"
)
type regexpRewriter struct {
okStart, okRest [256]bool
replacement byte
}
func newRegexpRewriter(startRe, restRe string) *regexpRewriter {
createArray := func(okRe string) (ret [256]bool) {
re := regexp.MustCompile(okRe)
// Check for only 7 bit non-control ASCII characters
for i := 32; i < 128; i++ {
if re.Match([]byte{byte(i)}) {
ret[i] = true
}
}
return
}
return ®expRewriter{okStart: createArray(startRe), okRest: createArray(restRe), replacement: byte('_')}
}
func (rr *regexpRewriter) rewrite(input []byte) {
if len(input) == 0 {
return
}
if !rr.okStart[input[0]] {
input[0] = rr.replacement
}
for i := 1; i < len(input); i++ {
if !rr.okRest[input[i]] {
input[i] = rr.replacement
}
}
}
// Utility, which handles both __name__ ('metric') tag, as well as
// rest of tags ('labels')
//
// It allow using any influxdb client, rewriting the tag names + the
// magic __name__ tag to match what Prometheus expects
type promRewriter struct {
metric, metricTail, label *regexpRewriter
}
func newPromRewriter() *promRewriter {
return &promRewriter{
metric: newRegexpRewriter(
"[a-zA-Z_:]",
"[a-zA-Z0-9_:]"),
metricTail: newRegexpRewriter(
"[a-zA-Z0-9_:]",
"[a-zA-Z0-9_:]"),
label: newRegexpRewriter(
"[a-zA-Z_]", "[a-zA-Z0-9_]")}
}
func (pr *promRewriter) rewriteMetric(data []byte) {
pr.metric.rewrite(data)
}
func (pr *promRewriter) rewriteMetricTail(data []byte) {
pr.metricTail.rewrite(data)
}
func (pr *promRewriter) rewriteLabel(data []byte) {
pr.label.rewrite(data)
}