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package logger
import (
"strings"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
// ChannelConfig configures loggers per channel.
type ChannelConfig struct {
// Dedicated channels per logger. By default logger allocated via named logger.
Channels map[string]Config `json:"channels" yaml:"channels"`
}
type Config struct {
// Mode configures logger based on some default template (development, production, off).
Mode string `json:"mode" yaml:"mode"`
// Level is the minimum enabled logging level. Note that this is a dynamic
// level, so calling ChannelConfig.Level.SetLevel will atomically change the log
// level of all loggers descended from this config.
Level string `json:"level" yaml:"level"`
// Encoding sets the logger's encoding. Valid values are "json" and
// "console", as well as any third-party encodings registered via
// RegisterEncoder.
Encoding string `json:"encoding" yaml:"encoding"`
// Output is a list of URLs or file paths to write logging output to.
// See Open for details.
Output []string `json:"output" yaml:"output"`
// ErrorOutput is a list of URLs to write internal logger errors to.
// The default is standard error.
//
// Note that this setting only affects internal errors; for sample code that
// sends error-level logs to a different location from info- and debug-level
// logs, see the package-level AdvancedConfiguration example.
ErrorOutput []string `json:"errorOutput" yaml:"errorOutput"`
}
// ZapConfig converts config into Zap configuration.
func (cfg *Config) BuildLogger() (*zap.Logger, error) {
var zCfg zap.Config
switch strings.ToLower(cfg.Mode) {
case "off", "none":
return zap.NewNop(), nil
case "production":
zCfg = zap.NewProductionConfig()
case "development":
zCfg = zap.NewDevelopmentConfig()
default:
zCfg = zap.Config{
Level: zap.NewAtomicLevelAt(zap.DebugLevel),
Encoding: "console",
EncoderConfig: zapcore.EncoderConfig{
MessageKey: "message",
LevelKey: "level",
TimeKey: "time",
NameKey: "name",
EncodeName: ColoredHashedNameEncoder,
EncodeLevel: ColoredLevelEncoder,
EncodeTime: UTCTimeEncoder,
EncodeCaller: zapcore.ShortCallerEncoder,
},
OutputPaths: []string{"stderr"},
ErrorOutputPaths: []string{"stderr"},
}
}
if cfg.Level != "" {
level := zap.NewAtomicLevel()
if err := level.UnmarshalText([]byte(cfg.Level)); err == nil {
zCfg.Level = level
}
}
if cfg.Encoding != "" {
zCfg.Encoding = cfg.Encoding
}
if len(cfg.Output) != 0 {
zCfg.OutputPaths = cfg.Output
}
if len(cfg.ErrorOutput) != 0 {
zCfg.ErrorOutputPaths = cfg.ErrorOutput
}
// todo: https://github.com/uber-go/zap/blob/master/FAQ.md#does-zap-support-log-rotation
return zCfg.Build()
}
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