113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
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// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package conditions
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import (
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"fmt"
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"github.com/elastic/beats/libbeat/common/match"
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"github.com/elastic/beats/libbeat/logp"
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)
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type matcherMap map[string]match.Matcher
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type rawMap map[string]interface{}
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// Matcher is a Condition that works with beat's internal notion of a string matcher.
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type Matcher struct {
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name string
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matchers matcherMap
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raw rawMap
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}
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// NewMatcherCondition builds a new Matcher with the given human name using the provided config fields.
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// The compiler function will take those fields and compile them.
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func NewMatcherCondition(
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name string,
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fields map[string]interface{},
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compile func(string) (match.Matcher, error),
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) (condition Matcher, err error) {
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condition.name = name
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condition.raw = fields
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condition.matchers = matcherMap{}
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condition.raw = rawMap{}
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if len(fields) == 0 {
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return condition, nil
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}
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for field, value := range fields {
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var err error
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switch v := value.(type) {
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case string:
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condition.matchers[field], err = compile(v)
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if err != nil {
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return condition, err
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}
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default:
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return condition, fmt.Errorf("unexpected type %T of %v", value, value)
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}
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}
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return condition, nil
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}
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// Check determines whether the given event matches this condition.
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func (c Matcher) Check(event ValuesMap) bool {
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if c.matchers == nil {
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return true
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}
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for field, matcher := range c.matchers {
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value, err := event.GetValue(field)
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if err != nil {
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return false
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}
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switch v := value.(type) {
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case string:
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if !matcher.MatchString(v) {
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return false
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}
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case []string:
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if !matcher.MatchAnyString(v) {
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return false
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}
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default:
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str, err := ExtractString(value)
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if err != nil {
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logp.Warn("unexpected type %T in %v condition as it accepts only strings.", value, c.name)
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return false
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}
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if !matcher.MatchString(str) {
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return false
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}
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}
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}
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return true
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}
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func (c Matcher) String() string {
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return fmt.Sprintf("%v: %v", c.name, c.raw)
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}
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