1// 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	"errors"
25	"fmt"
26	"sync"
27
28	"go.uber.org/zap/zapcore"
29)
30
31var (
32	errNoEncoderNameSpecified = errors.New("no encoder name specified")
33
34	_encoderNameToConstructor = map[string]func(zapcore.EncoderConfig) (zapcore.Encoder, error){
35		"console": func(encoderConfig zapcore.EncoderConfig) (zapcore.Encoder, error) {
36			return zapcore.NewConsoleEncoder(encoderConfig), nil
37		},
38		"json": func(encoderConfig zapcore.EncoderConfig) (zapcore.Encoder, error) {
39			return zapcore.NewJSONEncoder(encoderConfig), nil
40		},
41	}
42	_encoderMutex sync.RWMutex
43)
44
45// RegisterEncoder registers an encoder constructor, which the Config struct
46// can then reference. By default, the "json" and "console" encoders are
47// registered.
48//
49// Attempting to register an encoder whose name is already taken returns an
50// error.
51func RegisterEncoder(name string, constructor func(zapcore.EncoderConfig) (zapcore.Encoder, error)) error {
52	_encoderMutex.Lock()
53	defer _encoderMutex.Unlock()
54	if name == "" {
55		return errNoEncoderNameSpecified
56	}
57	if _, ok := _encoderNameToConstructor[name]; ok {
58		return fmt.Errorf("encoder already registered for name %q", name)
59	}
60	_encoderNameToConstructor[name] = constructor
61	return nil
62}
63
64func newEncoder(name string, encoderConfig zapcore.EncoderConfig) (zapcore.Encoder, error) {
65	_encoderMutex.RLock()
66	defer _encoderMutex.RUnlock()
67	if name == "" {
68		return nil, errNoEncoderNameSpecified
69	}
70	constructor, ok := _encoderNameToConstructor[name]
71	if !ok {
72		return nil, fmt.Errorf("no encoder registered for name %q", name)
73	}
74	return constructor(encoderConfig)
75}
76