Merge pull request #118 from ipfs/feat/with-stacktrace

Add WithStacktrace untility

log.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 )
 
 // StandardLogger provides API compatibility with standard printf loggers
@@ -73,3 +74,11 @@ func (logger *ZapEventLogger) Warningf(format string, args ...interface{}) {
 func FormatRFC3339(t time.Time) string {
 	return t.UTC().Format(time.RFC3339Nano)
 }
+
+func WithStacktrace(l *ZapEventLogger, level LogLevel) *ZapEventLogger {
+	copyLogger := *l
+	copyLogger.SugaredLogger = *copyLogger.SugaredLogger.Desugar().
+		WithOptions(zap.AddStacktrace(zapcore.Level(level))).Sugar()
+	copyLogger.skipLogger = *copyLogger.SugaredLogger.Desugar().WithOptions(zap.AddCallerSkip(1)).Sugar()
+	return &copyLogger
+}