Function FromContextWithFallback

pkg/util/spanlogger/spanlogger.go:69–82

FromContextWithFallback returns a span logger using the current parent span. IF there is no parent span, the SpanLogger will only log to the logger within the context. If the context doesn't have a logger, the fallback logger is used.

(ctx context.Context, fallback log.Logger)

// within the context. If the context doesn't have a logger, the fallback
// logger is used.
func FromContextWithFallback(ctx context.Context, fallback log.Logger) *SpanLogger {
	logger, ok := ctx.Value(loggerCtxKey).(log.Logger)
	if !ok {
		logger = fallback
	}
	sp := opentracing.SpanFromContext(ctx)
	if sp == nil {
		sp = defaultNoopSpan
	}
	return &SpanLogger{
		Logger: util_log.WithContext(ctx, logger),
		Span:   sp,
	}
}

// Log implements gokit's Logger interface; sends logs to underlying logger and
// also puts the on the spans.