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zap-adapter.go
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zap-adapter.go
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package log
import (
"encoding/json"
"errors"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
type zapAdapter struct {
logger *zerolog.Logger
}
func (z *zapAdapter) Write(p []byte) (int, error) {
// parse zap's json log format and output it to zerolog
var fields map[string]interface{}
if err := json.Unmarshal(p, &fields); err != nil {
return 0, err
}
// build context
context := z.logger.With()
// read level and remove it from fields
level, ok := fields[zerolog.LevelFieldName]
if !ok {
return 0, errors.New("level not found")
}
if level == "dpanic" {
level = "panic"
}
zerologLevel, err := zerolog.ParseLevel(level.(string))
if err != nil {
// not a well-known level so we user zerolog.NoLevel
zerologLevel = zerolog.NoLevel
// add level to context
context = context.Str(zerolog.LevelFieldName, level.(string))
}
// remove level from fields
delete(fields, zerolog.LevelFieldName)
// read message and remove it from fields
message, ok := fields[zerolog.MessageFieldName]
if !ok {
return 0, errors.New("message not found")
}
// remove message from fields
delete(fields, zerolog.MessageFieldName)
for k, v := range fields {
context = context.Interface(k, v)
}
logger := context.Logger()
logger.WithLevel(zerologLevel).CallerSkipFrame(4).Msg(message.(string))
return len(p), nil
}
// NewZapAdapter returns a new zapcore Core logger interface that converts given logger's io.writer to WriteSyncer.
func NewZapAdapter(logger *Logger, component string) zapcore.Core {
currentLevel := logger.GetLevel().String()
// zap has no "trace" level, so we use "debug" instead
if currentLevel == "trace" {
currentLevel = "debug"
}
level, err := zapcore.ParseLevel(currentLevel)
if err != nil {
log.Panic().Err(err).Str("level", level.String()).Msg("Unable to parse logger level")
}
encodercfg := zap.NewProductionEncoderConfig()
encodercfg.EncodeTime = zapcore.RFC3339TimeEncoder
encodercfg.TimeKey = zerolog.TimestampFieldName
encodercfg.LevelKey = zerolog.LevelFieldName
encodercfg.MessageKey = zerolog.MessageFieldName
encodercfg.StacktraceKey = zerolog.ErrorStackFieldName
encodercfg.CallerKey = zerolog.CallerFieldName
encodercfg.EncodeCaller = zapcore.ShortCallerEncoder
// duplicate zerolog logger and remove it is context
childLogger := logger.logger.With().Logger()
childLogger.UpdateContext(func(c zerolog.Context) zerolog.Context {
// reset context
return zerolog.Context{}
})
adapter := &zapAdapter{
logger: &childLogger,
}
return zapcore.NewCore(
zapcore.NewJSONEncoder(encodercfg),
zapcore.AddSync(adapter),
level,
).With([]zap.Field{zap.String(componentKey, component)})
}