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ignorer.go
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ignorer.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 apmhttp
import (
"net/http"
"regexp"
"sync"
"go.elastic.co/apm/internal/configutil"
"go.elastic.co/apm/internal/wildcard"
)
const (
envIgnoreURLs = "ELASTIC_APM_TRANSACTION_IGNORE_URLS"
deprecatedEnvIgnoreURLs = "ELASTIC_APM_IGNORE_URLS"
)
var (
defaultServerRequestIgnorerOnce sync.Once
defaultServerRequestIgnorer RequestIgnorerFunc = IgnoreNone
)
// DefaultServerRequestIgnorer returns the default RequestIgnorer to use in
// handlers. If ELASTIC_APM_TRANSACTION_IGNORE_URLS is set, it will be treated as a
// comma-separated list of wildcard patterns; requests that match any of the
// patterns will be ignored.
func DefaultServerRequestIgnorer() RequestIgnorerFunc {
defaultServerRequestIgnorerOnce.Do(func() {
matchers := configutil.ParseWildcardPatternsEnv(envIgnoreURLs, nil)
if len(matchers) == 0 {
matchers = configutil.ParseWildcardPatternsEnv(deprecatedEnvIgnoreURLs, nil)
}
if len(matchers) != 0 {
defaultServerRequestIgnorer = NewWildcardPatternsRequestIgnorer(matchers)
}
})
return defaultServerRequestIgnorer
}
// NewRegexpRequestIgnorer returns a RequestIgnorerFunc which matches requests'
// URLs against re. Note that for server requests, typically only Path and
// possibly RawQuery will be set, so the regular expression should take this
// into account.
func NewRegexpRequestIgnorer(re *regexp.Regexp) RequestIgnorerFunc {
if re == nil {
panic("re == nil")
}
return func(r *http.Request) bool {
return re.MatchString(r.URL.String())
}
}
// NewWildcardPatternsRequestIgnorer returns a RequestIgnorerFunc which matches
// requests' URLs against any of the matchers. Note that for server requests,
// typically only Path and possibly RawQuery will be set, so the wildcard patterns
// should take this into account.
func NewWildcardPatternsRequestIgnorer(matchers wildcard.Matchers) RequestIgnorerFunc {
if len(matchers) == 0 {
panic("len(matchers) == 0")
}
return func(r *http.Request) bool {
return matchers.MatchAny(r.URL.String())
}
}
// IgnoreNone is a RequestIgnorerFunc which ignores no requests.
func IgnoreNone(*http.Request) bool {
return false
}