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replace.go
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replace.go
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// Copyright (c) 2018 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 tag
import (
"fmt"
"regexp"
"github.com/m3db/m3/src/query/block"
"github.com/m3db/m3/src/query/models"
)
// TagReplaceType creates a new tag for all metrics containing a tag
// with the given name whose value matches the given regex.
// NB: This does not actually remove the original tag, but will override
// the existing tag if the source and destination name parameters are equal.
const TagReplaceType = "label_replace"
// Builds and adds the replaced tag if the source tag is found in the list,
// and if the value of that tag matches the given regex. Returns false if the series
// does not contain the source tag name, regardless of if the value matches the regex.
func addTagIfFoundAndValid(
tags models.Tags,
val []byte,
destinationName []byte,
destinationValRegex []byte,
regex *regexp.Regexp,
) (models.Tag, bool) {
indices := regex.FindSubmatchIndex(val)
if indices == nil {
return models.Tag{}, false
}
destinationVal := regex.Expand([]byte{}, destinationValRegex, val, indices)
return models.Tag{Name: destinationName, Value: destinationVal}, true
}
func makeTagReplaceFunc(params []string) (tagTransformFunc, error) {
if len(params) != 4 {
return nil, fmt.Errorf("invalid number of args for tag replace: %d", len(params))
}
regex, err := regexp.Compile(params[3])
if err != nil {
return nil, err
}
destinationName := []byte(params[0])
destinationValRegex := []byte(params[1])
sourceName := []byte(params[2])
return func(
meta block.Metadata,
seriesMeta []block.SeriesMeta,
) (block.Metadata, []block.SeriesMeta) {
// Optimization if all joining series are shared by the block,
// or if there is only a shared metadata and no single series metas.
val, found := meta.Tags.Get(sourceName)
if found {
tag, valid := addTagIfFoundAndValid(
meta.Tags,
val,
destinationName,
destinationValRegex,
regex,
)
// NB: If the tag exists in shared block tag list, it cannot also exist
// in the tag lists for the series metadatas, so it's valid to short
// circuit here.
if valid {
meta.Tags = meta.Tags.AddOrUpdateTag(tag)
}
return meta, seriesMeta
}
if len(seriesMeta) == 0 {
return meta, seriesMeta
}
for i, meta := range seriesMeta {
val, found := meta.Tags.Get(sourceName)
if !found {
continue
}
if tag, valid := addTagIfFoundAndValid(
meta.Tags,
val,
destinationName,
destinationValRegex,
regex,
); valid {
seriesMeta[i].Tags = seriesMeta[i].Tags.AddOrUpdateTag(tag)
}
}
return meta, seriesMeta
}, nil
}