/
filter.go
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/
filter.go
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// Copyright (c) 2019-2023 Vincent Cheung (coolingfall@gmail.com).
//
// 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 lork
import (
"errors"
"strings"
)
// FilterReply defines the result of filter.
type FilterReply int8
const (
// Accept represents the logging will be accepted by filter.
Accept FilterReply = iota + 1
// Deny represents the logging will be denied by filter.
Deny
)
// Filter represents a logging filter for lork.
type Filter interface {
// Do filters the logging. The logs will be accepted or denied according to FilterReply.
Do(e *LogEvent) FilterReply
}
// thresholdFilter represents a filter with threshold.
type thresholdFilter struct {
level Level
}
// NewThresholdFilter creates a new instance of thresholdFilter.
func NewThresholdFilter(lvl Level) Filter {
return &thresholdFilter{
level: lvl,
}
}
func (f *thresholdFilter) Do(e *LogEvent) FilterReply {
if e.LevelInt() >= f.level {
return Accept
}
return Deny
}
// keywordFilter represents a filter by key word rule.
type keywordFilter struct {
keywords []string
}
// NewKeywordFilter creates a new instance of keywordFilter.
func NewKeywordFilter(keywords ...string) Filter {
return &keywordFilter{
keywords: keywords,
}
}
var errFound = errors.New("found")
func (f *keywordFilter) Do(e *LogEvent) FilterReply {
err := e.Fields(func(k, v []byte, _ bool) error {
if f.compare(k, v) {
return errFound
}
return nil
})
if err == errFound {
return Accept
}
return Deny
}
func (f *keywordFilter) compare(key []byte, value []byte) bool {
for _, keyword := range f.keywords {
if strings.Contains(keyword, "=") &&
keyword == string(key)+"="+string(value) {
return true
}
if keyword == string(key) || keyword == string(value) {
return true
}
}
return false
}