storagenode/pieces: capture logger time Key in zapwrapper

Updates https://github.com/storj/storj/issues/5349

Change-Id: I426f38c0ae0f93d498317e3f66ba4f5724620758

storagenode/pieces/lazyfilewalker/zapwrapper.go

@@ -6,8 +6,10 @@ package lazyfilewalker
 import (
 	"bytes"
 	"encoding/json"
+	"io"
 	"strconv"
 	"strings"
+	"time"
 
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
@@ -17,6 +19,8 @@ type zapWrapper struct {
 	Log *zap.Logger
 }
 
+var _ io.Writer = (*zapWrapper)(nil)
+
 // Write writes the provided bytes to the underlying logger
 // returns the length of the bytes.
 //
@@ -40,6 +44,7 @@ type zapLogger struct {
 	Message string        `json:"M"`
 	Stack   string        `json:"S"`
 	Name    string        `json:"N"`
+	Time    time.Time     `json:"T"`
 
 	LogMap map[string]interface{} `json:"-"`
 }
@@ -72,6 +77,7 @@ func (w *zapWrapper) log(b []byte) error {
 	delete(logger.LogMap, "M")
 	delete(logger.LogMap, "S")
 	delete(logger.LogMap, "N")
+	delete(logger.LogMap, "T")
 
 	log := w.Log.Named(logger.Name)
 	if ce := log.Check(logger.Level, logger.Message); ce != nil {
@@ -82,6 +88,10 @@ func (w *zapWrapper) log(b []byte) error {
 			ce.Caller = *caller
 		}
 
+		if !logger.Time.IsZero() {
+			ce.Time = logger.Time
+		}
+
 		var fields []zapcore.Field
 		for key, val := range logger.LogMap {
 			fields = append(fields, zap.Any(key, val))