youtubebeat/vendor/github.com/elastic/beats/libbeat/conditions/matcher.go

112 lines
2.7 KiB
Go

// 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 conditions
import (
"fmt"
"github.com/elastic/beats/libbeat/common/match"
"github.com/elastic/beats/libbeat/logp"
)
type matcherMap map[string]match.Matcher
type rawMap map[string]interface{}
// Matcher is a Condition that works with beat's internal notion of a string matcher.
type Matcher struct {
name string
matchers matcherMap
raw rawMap
}
// NewMatcherCondition builds a new Matcher with the given human name using the provided config fields.
// The compiler function will take those fields and compile them.
func NewMatcherCondition(
name string,
fields map[string]interface{},
compile func(string) (match.Matcher, error),
) (condition Matcher, err error) {
condition.name = name
condition.raw = fields
condition.matchers = matcherMap{}
condition.raw = rawMap{}
if len(fields) == 0 {
return condition, nil
}
for field, value := range fields {
var err error
switch v := value.(type) {
case string:
condition.matchers[field], err = compile(v)
if err != nil {
return condition, err
}
default:
return condition, fmt.Errorf("unexpected type %T of %v", value, value)
}
}
return condition, nil
}
// Check determines whether the given event matches this condition.
func (c Matcher) Check(event ValuesMap) bool {
if c.matchers == nil {
return true
}
for field, matcher := range c.matchers {
value, err := event.GetValue(field)
if err != nil {
return false
}
switch v := value.(type) {
case string:
if !matcher.MatchString(v) {
return false
}
case []string:
if !matcher.MatchAnyString(v) {
return false
}
default:
str, err := ExtractString(value)
if err != nil {
logp.Warn("unexpected type %T in %v condition as it accepts only strings.", value, c.name)
return false
}
if !matcher.MatchString(str) {
return false
}
}
}
return true
}
func (c Matcher) String() string {
return fmt.Sprintf("%v: %v", c.name, c.raw)
}