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Takahiro Suzukid7bf8202020-12-17 20:21:59 +09001// Copyright (c) 2016 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
21package zap
22
23import "go.uber.org/zap/zapcore"
24
25// An Option configures a Logger.
26type Option interface {
27 apply(*Logger)
28}
29
30// optionFunc wraps a func so it satisfies the Option interface.
31type optionFunc func(*Logger)
32
33func (f optionFunc) apply(log *Logger) {
34 f(log)
35}
36
37// WrapCore wraps or replaces the Logger's underlying zapcore.Core.
38func WrapCore(f func(zapcore.Core) zapcore.Core) Option {
39 return optionFunc(func(log *Logger) {
40 log.core = f(log.core)
41 })
42}
43
44// Hooks registers functions which will be called each time the Logger writes
45// out an Entry. Repeated use of Hooks is additive.
46//
47// Hooks are useful for simple side effects, like capturing metrics for the
48// number of emitted logs. More complex side effects, including anything that
49// requires access to the Entry's structured fields, should be implemented as
50// a zapcore.Core instead. See zapcore.RegisterHooks for details.
51func Hooks(hooks ...func(zapcore.Entry) error) Option {
52 return optionFunc(func(log *Logger) {
53 log.core = zapcore.RegisterHooks(log.core, hooks...)
54 })
55}
56
57// Fields adds fields to the Logger.
58func Fields(fs ...Field) Option {
59 return optionFunc(func(log *Logger) {
60 log.core = log.core.With(fs)
61 })
62}
63
64// ErrorOutput sets the destination for errors generated by the Logger. Note
65// that this option only affects internal errors; for sample code that sends
66// error-level logs to a different location from info- and debug-level logs,
67// see the package-level AdvancedConfiguration example.
68//
69// The supplied WriteSyncer must be safe for concurrent use. The Open and
70// zapcore.Lock functions are the simplest ways to protect files with a mutex.
71func ErrorOutput(w zapcore.WriteSyncer) Option {
72 return optionFunc(func(log *Logger) {
73 log.errorOutput = w
74 })
75}
76
77// Development puts the logger in development mode, which makes DPanic-level
78// logs panic instead of simply logging an error.
79func Development() Option {
80 return optionFunc(func(log *Logger) {
81 log.development = true
82 })
83}
84
85// AddCaller configures the Logger to annotate each message with the filename
86// and line number of zap's caller.
87func AddCaller() Option {
88 return optionFunc(func(log *Logger) {
89 log.addCaller = true
90 })
91}
92
93// AddCallerSkip increases the number of callers skipped by caller annotation
94// (as enabled by the AddCaller option). When building wrappers around the
95// Logger and SugaredLogger, supplying this Option prevents zap from always
96// reporting the wrapper code as the caller.
97func AddCallerSkip(skip int) Option {
98 return optionFunc(func(log *Logger) {
99 log.callerSkip += skip
100 })
101}
102
103// AddStacktrace configures the Logger to record a stack trace for all messages at
104// or above a given level.
105func AddStacktrace(lvl zapcore.LevelEnabler) Option {
106 return optionFunc(func(log *Logger) {
107 log.addStack = lvl
108 })
109}