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Prince Pereirac1c21d62021-04-22 08:38:15 +00001// 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 "fmt"
25 "math"
26 "time"
27
28 "go.uber.org/zap/zapcore"
29)
30
31// Field is an alias for Field. Aliasing this type dramatically
32// improves the navigability of this package's API documentation.
33type Field = zapcore.Field
34
35// Skip constructs a no-op field, which is often useful when handling invalid
36// inputs in other Field constructors.
37func Skip() Field {
38 return Field{Type: zapcore.SkipType}
39}
40
41// Binary constructs a field that carries an opaque binary blob.
42//
43// Binary data is serialized in an encoding-appropriate format. For example,
44// zap's JSON encoder base64-encodes binary blobs. To log UTF-8 encoded text,
45// use ByteString.
46func Binary(key string, val []byte) Field {
47 return Field{Key: key, Type: zapcore.BinaryType, Interface: val}
48}
49
50// Bool constructs a field that carries a bool.
51func Bool(key string, val bool) Field {
52 var ival int64
53 if val {
54 ival = 1
55 }
56 return Field{Key: key, Type: zapcore.BoolType, Integer: ival}
57}
58
59// ByteString constructs a field that carries UTF-8 encoded text as a []byte.
60// To log opaque binary blobs (which aren't necessarily valid UTF-8), use
61// Binary.
62func ByteString(key string, val []byte) Field {
63 return Field{Key: key, Type: zapcore.ByteStringType, Interface: val}
64}
65
66// Complex128 constructs a field that carries a complex number. Unlike most
67// numeric fields, this costs an allocation (to convert the complex128 to
68// interface{}).
69func Complex128(key string, val complex128) Field {
70 return Field{Key: key, Type: zapcore.Complex128Type, Interface: val}
71}
72
73// Complex64 constructs a field that carries a complex number. Unlike most
74// numeric fields, this costs an allocation (to convert the complex64 to
75// interface{}).
76func Complex64(key string, val complex64) Field {
77 return Field{Key: key, Type: zapcore.Complex64Type, Interface: val}
78}
79
80// Float64 constructs a field that carries a float64. The way the
81// floating-point value is represented is encoder-dependent, so marshaling is
82// necessarily lazy.
83func Float64(key string, val float64) Field {
84 return Field{Key: key, Type: zapcore.Float64Type, Integer: int64(math.Float64bits(val))}
85}
86
87// Float32 constructs a field that carries a float32. The way the
88// floating-point value is represented is encoder-dependent, so marshaling is
89// necessarily lazy.
90func Float32(key string, val float32) Field {
91 return Field{Key: key, Type: zapcore.Float32Type, Integer: int64(math.Float32bits(val))}
92}
93
94// Int constructs a field with the given key and value.
95func Int(key string, val int) Field {
96 return Int64(key, int64(val))
97}
98
99// Int64 constructs a field with the given key and value.
100func Int64(key string, val int64) Field {
101 return Field{Key: key, Type: zapcore.Int64Type, Integer: val}
102}
103
104// Int32 constructs a field with the given key and value.
105func Int32(key string, val int32) Field {
106 return Field{Key: key, Type: zapcore.Int32Type, Integer: int64(val)}
107}
108
109// Int16 constructs a field with the given key and value.
110func Int16(key string, val int16) Field {
111 return Field{Key: key, Type: zapcore.Int16Type, Integer: int64(val)}
112}
113
114// Int8 constructs a field with the given key and value.
115func Int8(key string, val int8) Field {
116 return Field{Key: key, Type: zapcore.Int8Type, Integer: int64(val)}
117}
118
119// String constructs a field with the given key and value.
120func String(key string, val string) Field {
121 return Field{Key: key, Type: zapcore.StringType, String: val}
122}
123
124// Uint constructs a field with the given key and value.
125func Uint(key string, val uint) Field {
126 return Uint64(key, uint64(val))
127}
128
129// Uint64 constructs a field with the given key and value.
130func Uint64(key string, val uint64) Field {
131 return Field{Key: key, Type: zapcore.Uint64Type, Integer: int64(val)}
132}
133
134// Uint32 constructs a field with the given key and value.
135func Uint32(key string, val uint32) Field {
136 return Field{Key: key, Type: zapcore.Uint32Type, Integer: int64(val)}
137}
138
139// Uint16 constructs a field with the given key and value.
140func Uint16(key string, val uint16) Field {
141 return Field{Key: key, Type: zapcore.Uint16Type, Integer: int64(val)}
142}
143
144// Uint8 constructs a field with the given key and value.
145func Uint8(key string, val uint8) Field {
146 return Field{Key: key, Type: zapcore.Uint8Type, Integer: int64(val)}
147}
148
149// Uintptr constructs a field with the given key and value.
150func Uintptr(key string, val uintptr) Field {
151 return Field{Key: key, Type: zapcore.UintptrType, Integer: int64(val)}
152}
153
154// Reflect constructs a field with the given key and an arbitrary object. It uses
155// an encoding-appropriate, reflection-based function to lazily serialize nearly
156// any object into the logging context, but it's relatively slow and
157// allocation-heavy. Outside tests, Any is always a better choice.
158//
159// If encoding fails (e.g., trying to serialize a map[int]string to JSON), Reflect
160// includes the error message in the final log output.
161func Reflect(key string, val interface{}) Field {
162 return Field{Key: key, Type: zapcore.ReflectType, Interface: val}
163}
164
165// Namespace creates a named, isolated scope within the logger's context. All
166// subsequent fields will be added to the new namespace.
167//
168// This helps prevent key collisions when injecting loggers into sub-components
169// or third-party libraries.
170func Namespace(key string) Field {
171 return Field{Key: key, Type: zapcore.NamespaceType}
172}
173
174// Stringer constructs a field with the given key and the output of the value's
175// String method. The Stringer's String method is called lazily.
176func Stringer(key string, val fmt.Stringer) Field {
177 return Field{Key: key, Type: zapcore.StringerType, Interface: val}
178}
179
180// Time constructs a Field with the given key and value. The encoder
181// controls how the time is serialized.
182func Time(key string, val time.Time) Field {
183 return Field{Key: key, Type: zapcore.TimeType, Integer: val.UnixNano(), Interface: val.Location()}
184}
185
186// Stack constructs a field that stores a stacktrace of the current goroutine
187// under provided key. Keep in mind that taking a stacktrace is eager and
188// expensive (relatively speaking); this function both makes an allocation and
189// takes about two microseconds.
190func Stack(key string) Field {
191 // Returning the stacktrace as a string costs an allocation, but saves us
192 // from expanding the zapcore.Field union struct to include a byte slice. Since
193 // taking a stacktrace is already so expensive (~10us), the extra allocation
194 // is okay.
195 return String(key, takeStacktrace())
196}
197
198// Duration constructs a field with the given key and value. The encoder
199// controls how the duration is serialized.
200func Duration(key string, val time.Duration) Field {
201 return Field{Key: key, Type: zapcore.DurationType, Integer: int64(val)}
202}
203
204// Object constructs a field with the given key and ObjectMarshaler. It
205// provides a flexible, but still type-safe and efficient, way to add map- or
206// struct-like user-defined types to the logging context. The struct's
207// MarshalLogObject method is called lazily.
208func Object(key string, val zapcore.ObjectMarshaler) Field {
209 return Field{Key: key, Type: zapcore.ObjectMarshalerType, Interface: val}
210}
211
212// Any takes a key and an arbitrary value and chooses the best way to represent
213// them as a field, falling back to a reflection-based approach only if
214// necessary.
215//
216// Since byte/uint8 and rune/int32 are aliases, Any can't differentiate between
217// them. To minimize surprises, []byte values are treated as binary blobs, byte
218// values are treated as uint8, and runes are always treated as integers.
219func Any(key string, value interface{}) Field {
220 switch val := value.(type) {
221 case zapcore.ObjectMarshaler:
222 return Object(key, val)
223 case zapcore.ArrayMarshaler:
224 return Array(key, val)
225 case bool:
226 return Bool(key, val)
227 case []bool:
228 return Bools(key, val)
229 case complex128:
230 return Complex128(key, val)
231 case []complex128:
232 return Complex128s(key, val)
233 case complex64:
234 return Complex64(key, val)
235 case []complex64:
236 return Complex64s(key, val)
237 case float64:
238 return Float64(key, val)
239 case []float64:
240 return Float64s(key, val)
241 case float32:
242 return Float32(key, val)
243 case []float32:
244 return Float32s(key, val)
245 case int:
246 return Int(key, val)
247 case []int:
248 return Ints(key, val)
249 case int64:
250 return Int64(key, val)
251 case []int64:
252 return Int64s(key, val)
253 case int32:
254 return Int32(key, val)
255 case []int32:
256 return Int32s(key, val)
257 case int16:
258 return Int16(key, val)
259 case []int16:
260 return Int16s(key, val)
261 case int8:
262 return Int8(key, val)
263 case []int8:
264 return Int8s(key, val)
265 case string:
266 return String(key, val)
267 case []string:
268 return Strings(key, val)
269 case uint:
270 return Uint(key, val)
271 case []uint:
272 return Uints(key, val)
273 case uint64:
274 return Uint64(key, val)
275 case []uint64:
276 return Uint64s(key, val)
277 case uint32:
278 return Uint32(key, val)
279 case []uint32:
280 return Uint32s(key, val)
281 case uint16:
282 return Uint16(key, val)
283 case []uint16:
284 return Uint16s(key, val)
285 case uint8:
286 return Uint8(key, val)
287 case []byte:
288 return Binary(key, val)
289 case uintptr:
290 return Uintptr(key, val)
291 case []uintptr:
292 return Uintptrs(key, val)
293 case time.Time:
294 return Time(key, val)
295 case []time.Time:
296 return Times(key, val)
297 case time.Duration:
298 return Duration(key, val)
299 case []time.Duration:
300 return Durations(key, val)
301 case error:
302 return NamedError(key, val)
303 case []error:
304 return Errors(key, val)
305 case fmt.Stringer:
306 return Stringer(key, val)
307 default:
308 return Reflect(key, val)
309 }
310}