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Replace Split with special purpose implementation
This improves performance from 3169ns/op to 2836 ns/op and drops one allocation per op. Signed-off-by: Clayton O'Neill <claytono@github.com>
This commit is contained in:
parent
e3cdd85a09
commit
a4faae262b
1 changed files with 28 additions and 13 deletions
41
exporter.go
41
exporter.go
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@ -584,9 +584,11 @@ func buildEvent(statType, metric string, value float64, relative bool, labels ma
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}
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}
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func parseDogStatsDTagToKeyValue(tag string) (k, v string) {
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func handleDogStatsDTagToKeyValue(labels map[string]string, component, tag string) {
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// Bail early if the tag is empty
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if len(tag) == 0 {
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tagErrors.Inc()
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log.Debugf("Malformed or empty DogStatsD tag %s in component %s", tag, component)
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return
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}
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// Skip hash if found.
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@ -595,6 +597,7 @@ func parseDogStatsDTagToKeyValue(tag string) (k, v string) {
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}
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// find the first comma and split the tag into key and value.
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var k, v string
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for i, c := range tag {
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if c == ':' {
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k = tag[0:i]
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@ -602,6 +605,15 @@ func parseDogStatsDTagToKeyValue(tag string) (k, v string) {
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break
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}
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}
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// If either of them is empty, then either the k or v is empty, or we
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// didn't find a colon, either way, throw an error and skip ahead.
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if len(k) == 0 || len(v) == 0 {
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tagErrors.Inc()
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log.Debugf("Malformed or empty DogStatsD tag %s in component %s", tag, component)
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return
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}
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labels[escapeMetricName(k)] = v
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return
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}
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@ -609,19 +621,22 @@ func parseDogStatsDTagToKeyValue(tag string) (k, v string) {
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func parseDogStatsDTagsToLabels(component string) map[string]string {
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labels := map[string]string{}
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tagsReceived.Inc()
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tags := strings.Split(component, ",")
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for _, t := range tags {
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k, v := parseDogStatsDTagToKeyValue(t)
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// If either of them is empty, then either the k or v is empty, or we
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// didn't find a colon, either way, throw an error and skip ahead.
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if len(k) == 0 || len(v) == 0 {
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tagErrors.Inc()
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log.Debugf("Malformed or empty DogStatsD tag %s in component %s", t, component)
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continue
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}
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labels[escapeMetricName(k)] = v
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lastTagEndIndex := 0
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for i, c := range component {
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if c == ',' {
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tag := component[lastTagEndIndex:i]
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lastTagEndIndex = i + 1
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handleDogStatsDTagToKeyValue(labels, component, tag)
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}
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}
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// If we're not off the end of the string, add the last tag
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if lastTagEndIndex < len(component) {
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tag := component[lastTagEndIndex:]
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handleDogStatsDTagToKeyValue(labels, component, tag)
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}
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return labels
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}
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@ -703,7 +718,7 @@ samples:
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multiplyEvents = int(1 / samplingFactor)
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}
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case '#':
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labels = parseDogStatsDTagsToLabels(component)
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labels = parseDogStatsDTagsToLabels(component[1:])
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default:
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log.Debugf("Invalid sampling factor or tag section %s on line %s", components[2], line)
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sampleErrors.WithLabelValues("invalid_sample_factor").Inc()
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