1 // Copyright (c) 2020 Uber Technologies, Inc.
2 //
3 // Permission is hereby granted, free of charge, to any person obtaining a copy
4 // of this software and associated documentation files (the "Software"), to deal
5 // in the Software without restriction, including without limitation the rights
6 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 // copies of the Software, and to permit persons to whom the Software is
8 // furnished to do so, subject to the following conditions:
9 //
10 // The above copyright notice and this permission notice shall be included in
11 // all copies or substantial portions of the Software.
12 //
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 // THE SOFTWARE.
20 21 package zapcore
22 23 import "fmt"
24 25 type levelFilterCore struct {
26 core Core
27 level LevelEnabler
28 }
29 30 var (
31 _ Core = (*levelFilterCore)(nil)
32 _ leveledEnabler = (*levelFilterCore)(nil)
33 )
34 35 // NewIncreaseLevelCore creates a core that can be used to increase the level of
36 // an existing Core. It cannot be used to decrease the logging level, as it acts
37 // as a filter before calling the underlying core. If level decreases the log level,
38 // an error is returned.
39 func NewIncreaseLevelCore(core Core, level LevelEnabler) (Core, error) {
40 for l := _maxLevel; l >= _minLevel; l-- {
41 if !core.Enabled(l) && level.Enabled(l) {
42 return nil, fmt.Errorf("invalid increase level, as level %q is allowed by increased level, but not by existing core", l)
43 }
44 }
45 46 return &levelFilterCore{core, level}, nil
47 }
48 49 func (c *levelFilterCore) Enabled(lvl Level) bool {
50 return c.level.Enabled(lvl)
51 }
52 53 func (c *levelFilterCore) Level() Level {
54 return LevelOf(c.level)
55 }
56 57 func (c *levelFilterCore) With(fields []Field) Core {
58 return &levelFilterCore{c.core.With(fields), c.level}
59 }
60 61 func (c *levelFilterCore) Check(ent Entry, ce *CheckedEntry) *CheckedEntry {
62 if !c.Enabled(ent.Level) {
63 return ce
64 }
65 66 return c.core.Check(ent, ce)
67 }
68 69 func (c *levelFilterCore) Write(ent Entry, fields []Field) error {
70 return c.core.Write(ent, fields)
71 }
72 73 func (c *levelFilterCore) Sync() error {
74 return c.core.Sync()
75 }
76