1// Copyright (c) 2012 - Cloud Instruments Co., Ltd.
2//
3// All rights reserved.
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are met:
7//
8// 1. Redistributions of source code must retain the above copyright notice, this
9//    list of conditions and the following disclaimer.
10// 2. Redistributions in binary form must reproduce the above copyright notice,
11//    this list of conditions and the following disclaimer in the documentation
12//    and/or other materials provided with the distribution.
13//
14// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
15// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
18// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24
25package seelog
26
27import (
28	"fmt"
29)
30
31// A filterDispatcher writes the given message to underlying receivers only if message log level
32// is in the allowed list.
33type filterDispatcher struct {
34	*dispatcher
35	allowList map[LogLevel]bool
36}
37
38// NewFilterDispatcher creates a new filterDispatcher using a list of allowed levels.
39func NewFilterDispatcher(formatter *formatter, receivers []interface{}, allowList ...LogLevel) (*filterDispatcher, error) {
40	disp, err := createDispatcher(formatter, receivers)
41	if err != nil {
42		return nil, err
43	}
44
45	allows := make(map[LogLevel]bool)
46	for _, allowLevel := range allowList {
47		allows[allowLevel] = true
48	}
49
50	return &filterDispatcher{disp, allows}, nil
51}
52
53func (filter *filterDispatcher) Dispatch(
54	message string,
55	level LogLevel,
56	context LogContextInterface,
57	errorFunc func(err error)) {
58	isAllowed, ok := filter.allowList[level]
59	if ok && isAllowed {
60		filter.dispatcher.Dispatch(message, level, context, errorFunc)
61	}
62}
63
64func (filter *filterDispatcher) String() string {
65	return fmt.Sprintf("filterDispatcher ->\n%s", filter.dispatcher)
66}
67