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Scott Baker2c1c4822019-10-16 11:02:41 -07001// 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 (
24 "sort"
25 "time"
26
27 "go.uber.org/zap/zapcore"
28)
29
30// SamplingConfig sets a sampling strategy for the logger. Sampling caps the
31// global CPU and I/O load that logging puts on your process while attempting
32// to preserve a representative subset of your logs.
33//
34// Values configured here are per-second. See zapcore.NewSampler for details.
35type SamplingConfig struct {
36 Initial int `json:"initial" yaml:"initial"`
37 Thereafter int `json:"thereafter" yaml:"thereafter"`
38}
39
40// Config offers a declarative way to construct a logger. It doesn't do
41// anything that can't be done with New, Options, and the various
42// zapcore.WriteSyncer and zapcore.Core wrappers, but it's a simpler way to
43// toggle common options.
44//
45// Note that Config intentionally supports only the most common options. More
46// unusual logging setups (logging to network connections or message queues,
47// splitting output between multiple files, etc.) are possible, but require
48// direct use of the zapcore package. For sample code, see the package-level
49// BasicConfiguration and AdvancedConfiguration examples.
50//
51// For an example showing runtime log level changes, see the documentation for
52// AtomicLevel.
53type Config struct {
54 // Level is the minimum enabled logging level. Note that this is a dynamic
55 // level, so calling Config.Level.SetLevel will atomically change the log
56 // level of all loggers descended from this config.
57 Level AtomicLevel `json:"level" yaml:"level"`
58 // Development puts the logger in development mode, which changes the
59 // behavior of DPanicLevel and takes stacktraces more liberally.
60 Development bool `json:"development" yaml:"development"`
61 // DisableCaller stops annotating logs with the calling function's file
62 // name and line number. By default, all logs are annotated.
63 DisableCaller bool `json:"disableCaller" yaml:"disableCaller"`
64 // DisableStacktrace completely disables automatic stacktrace capturing. By
65 // default, stacktraces are captured for WarnLevel and above logs in
66 // development and ErrorLevel and above in production.
67 DisableStacktrace bool `json:"disableStacktrace" yaml:"disableStacktrace"`
68 // Sampling sets a sampling policy. A nil SamplingConfig disables sampling.
69 Sampling *SamplingConfig `json:"sampling" yaml:"sampling"`
70 // Encoding sets the logger's encoding. Valid values are "json" and
71 // "console", as well as any third-party encodings registered via
72 // RegisterEncoder.
73 Encoding string `json:"encoding" yaml:"encoding"`
74 // EncoderConfig sets options for the chosen encoder. See
75 // zapcore.EncoderConfig for details.
76 EncoderConfig zapcore.EncoderConfig `json:"encoderConfig" yaml:"encoderConfig"`
77 // OutputPaths is a list of URLs or file paths to write logging output to.
78 // See Open for details.
79 OutputPaths []string `json:"outputPaths" yaml:"outputPaths"`
80 // ErrorOutputPaths is a list of URLs to write internal logger errors to.
81 // The default is standard error.
82 //
83 // Note that this setting only affects internal errors; for sample code that
84 // sends error-level logs to a different location from info- and debug-level
85 // logs, see the package-level AdvancedConfiguration example.
86 ErrorOutputPaths []string `json:"errorOutputPaths" yaml:"errorOutputPaths"`
87 // InitialFields is a collection of fields to add to the root logger.
88 InitialFields map[string]interface{} `json:"initialFields" yaml:"initialFields"`
89}
90
91// NewProductionEncoderConfig returns an opinionated EncoderConfig for
92// production environments.
93func NewProductionEncoderConfig() zapcore.EncoderConfig {
94 return zapcore.EncoderConfig{
95 TimeKey: "ts",
96 LevelKey: "level",
97 NameKey: "logger",
98 CallerKey: "caller",
99 MessageKey: "msg",
100 StacktraceKey: "stacktrace",
101 LineEnding: zapcore.DefaultLineEnding,
102 EncodeLevel: zapcore.LowercaseLevelEncoder,
103 EncodeTime: zapcore.EpochTimeEncoder,
104 EncodeDuration: zapcore.SecondsDurationEncoder,
105 EncodeCaller: zapcore.ShortCallerEncoder,
106 }
107}
108
109// NewProductionConfig is a reasonable production logging configuration.
110// Logging is enabled at InfoLevel and above.
111//
112// It uses a JSON encoder, writes to standard error, and enables sampling.
113// Stacktraces are automatically included on logs of ErrorLevel and above.
114func NewProductionConfig() Config {
115 return Config{
116 Level: NewAtomicLevelAt(InfoLevel),
117 Development: false,
118 Sampling: &SamplingConfig{
119 Initial: 100,
120 Thereafter: 100,
121 },
122 Encoding: "json",
123 EncoderConfig: NewProductionEncoderConfig(),
124 OutputPaths: []string{"stderr"},
125 ErrorOutputPaths: []string{"stderr"},
126 }
127}
128
129// NewDevelopmentEncoderConfig returns an opinionated EncoderConfig for
130// development environments.
131func NewDevelopmentEncoderConfig() zapcore.EncoderConfig {
132 return zapcore.EncoderConfig{
133 // Keys can be anything except the empty string.
134 TimeKey: "T",
135 LevelKey: "L",
136 NameKey: "N",
137 CallerKey: "C",
138 MessageKey: "M",
139 StacktraceKey: "S",
140 LineEnding: zapcore.DefaultLineEnding,
141 EncodeLevel: zapcore.CapitalLevelEncoder,
142 EncodeTime: zapcore.ISO8601TimeEncoder,
143 EncodeDuration: zapcore.StringDurationEncoder,
144 EncodeCaller: zapcore.ShortCallerEncoder,
145 }
146}
147
148// NewDevelopmentConfig is a reasonable development logging configuration.
149// Logging is enabled at DebugLevel and above.
150//
151// It enables development mode (which makes DPanicLevel logs panic), uses a
152// console encoder, writes to standard error, and disables sampling.
153// Stacktraces are automatically included on logs of WarnLevel and above.
154func NewDevelopmentConfig() Config {
155 return Config{
156 Level: NewAtomicLevelAt(DebugLevel),
157 Development: true,
158 Encoding: "console",
159 EncoderConfig: NewDevelopmentEncoderConfig(),
160 OutputPaths: []string{"stderr"},
161 ErrorOutputPaths: []string{"stderr"},
162 }
163}
164
165// Build constructs a logger from the Config and Options.
166func (cfg Config) Build(opts ...Option) (*Logger, error) {
167 enc, err := cfg.buildEncoder()
168 if err != nil {
169 return nil, err
170 }
171
172 sink, errSink, err := cfg.openSinks()
173 if err != nil {
174 return nil, err
175 }
176
177 log := New(
178 zapcore.NewCore(enc, sink, cfg.Level),
179 cfg.buildOptions(errSink)...,
180 )
181 if len(opts) > 0 {
182 log = log.WithOptions(opts...)
183 }
184 return log, nil
185}
186
187func (cfg Config) buildOptions(errSink zapcore.WriteSyncer) []Option {
188 opts := []Option{ErrorOutput(errSink)}
189
190 if cfg.Development {
191 opts = append(opts, Development())
192 }
193
194 if !cfg.DisableCaller {
195 opts = append(opts, AddCaller())
196 }
197
198 stackLevel := ErrorLevel
199 if cfg.Development {
200 stackLevel = WarnLevel
201 }
202 if !cfg.DisableStacktrace {
203 opts = append(opts, AddStacktrace(stackLevel))
204 }
205
206 if cfg.Sampling != nil {
207 opts = append(opts, WrapCore(func(core zapcore.Core) zapcore.Core {
208 return zapcore.NewSampler(core, time.Second, int(cfg.Sampling.Initial), int(cfg.Sampling.Thereafter))
209 }))
210 }
211
212 if len(cfg.InitialFields) > 0 {
213 fs := make([]Field, 0, len(cfg.InitialFields))
214 keys := make([]string, 0, len(cfg.InitialFields))
215 for k := range cfg.InitialFields {
216 keys = append(keys, k)
217 }
218 sort.Strings(keys)
219 for _, k := range keys {
220 fs = append(fs, Any(k, cfg.InitialFields[k]))
221 }
222 opts = append(opts, Fields(fs...))
223 }
224
225 return opts
226}
227
228func (cfg Config) openSinks() (zapcore.WriteSyncer, zapcore.WriteSyncer, error) {
229 sink, closeOut, err := Open(cfg.OutputPaths...)
230 if err != nil {
231 return nil, nil, err
232 }
233 errSink, _, err := Open(cfg.ErrorOutputPaths...)
234 if err != nil {
235 closeOut()
236 return nil, nil, err
237 }
238 return sink, errSink, nil
239}
240
241func (cfg Config) buildEncoder() (zapcore.Encoder, error) {
242 return newEncoder(cfg.Encoding, cfg.EncoderConfig)
243}