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filter.go
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filter.go
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// Copyright 2020 OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sumologicexporter
import (
"regexp"
"go.opentelemetry.io/collector/pdata/pcommon"
)
type filter struct {
regexes []*regexp.Regexp
}
func newFilter(flds []string) (filter, error) {
metadataRegexes := make([]*regexp.Regexp, len(flds))
for i, fld := range flds {
regex, err := regexp.Compile(fld)
if err != nil {
return filter{}, err
}
metadataRegexes[i] = regex
}
return filter{
regexes: metadataRegexes,
}, nil
}
// filterIn returns fields which match at least one of the filter regexes
func (f *filter) filterIn(attributes pcommon.Map) fields {
returnValue := pcommon.NewMap()
attributes.Range(func(k string, v pcommon.Value) bool {
for _, regex := range f.regexes {
if regex.MatchString(k) {
v.CopyTo(returnValue.PutEmpty(k))
return true
}
}
return true
})
return newFields(returnValue)
}
// filterOut returns fields which don't match any of the filter regexes
func (f *filter) filterOut(attributes pcommon.Map) fields {
returnValue := pcommon.NewMap()
attributes.Range(func(k string, v pcommon.Value) bool {
for _, regex := range f.regexes {
if regex.MatchString(k) {
return true
}
}
v.CopyTo(returnValue.PutEmpty(k))
return true
})
return newFields(returnValue)
}