150 lines
3.3 KiB
Go
150 lines
3.3 KiB
Go
// 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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"reflect"
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"strings"
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"github.com/elastic/beats/libbeat/common"
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"github.com/elastic/beats/libbeat/logp"
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)
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type rangeValue struct {
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gte *float64
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gt *float64
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lte *float64
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lt *float64
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}
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// Range is a Condition type for checking against ranges.
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type Range map[string]rangeValue
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// NewRangeCondition builds a new Range from a map of ranges.
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func NewRangeCondition(config map[string]interface{}) (c Range, err error) {
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c = Range{}
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updateRangeValue := func(key string, op string, value float64) error {
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field := strings.TrimSuffix(key, "."+op)
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_, exists := c[field]
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if !exists {
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c[field] = rangeValue{}
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}
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rv := c[field]
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switch op {
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case "gte":
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rv.gte = &value
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case "gt":
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rv.gt = &value
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case "lt":
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rv.lt = &value
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case "lte":
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rv.lte = &value
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default:
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return fmt.Errorf("unexpected field %s", op)
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}
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c[field] = rv
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return nil
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}
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for key, value := range config {
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floatValue, err := ExtractFloat(value)
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if err != nil {
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return c, err
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}
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list := strings.Split(key, ".")
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err = updateRangeValue(key, list[len(list)-1], floatValue)
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if err != nil {
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return c, err
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}
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}
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return c, nil
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}
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// Check determines whether the given event matches this condition.
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func (c Range) Check(event ValuesMap) bool {
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checkValue := func(value float64, rangeValue rangeValue) bool {
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if rangeValue.gte != nil {
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if value < *rangeValue.gte {
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return false
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}
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}
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if rangeValue.gt != nil {
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if value <= *rangeValue.gt {
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return false
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}
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}
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if rangeValue.lte != nil {
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if value > *rangeValue.lte {
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return false
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}
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}
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if rangeValue.lt != nil {
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if value >= *rangeValue.lt {
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return false
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}
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}
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return true
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}
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for field, rangeValue := range c {
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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 value.(type) {
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case int, int8, int16, int32, int64:
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intValue := reflect.ValueOf(value).Int()
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if !checkValue(float64(intValue), rangeValue) {
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return false
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}
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case uint, uint8, uint16, uint32, uint64:
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uintValue := reflect.ValueOf(value).Uint()
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if !checkValue(float64(uintValue), rangeValue) {
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return false
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}
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case float64, float32, common.Float:
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floatValue := reflect.ValueOf(value).Float()
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if !checkValue(floatValue, rangeValue) {
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return false
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}
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default:
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logp.Warn("unexpected type %T in range condition. ", value)
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return false
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}
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}
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return true
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}
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func (c Range) String() string {
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return fmt.Sprintf("range: %v", map[string]rangeValue(c))
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}
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