From ae20de8134ea107859b091845d09ce6cfe91683c Mon Sep 17 00:00:00 2001
From: Jim Tupper <git@tupper.org.uk>
Date: Sun, 28 Feb 2016 21:53:35 +0000
Subject: [PATCH] When rotating based on threshold, rotate to a file with the
 timestamp of the log that caused the threshold instead of to the current
 time.

---
 lib/rotatingfilestream.js | 7 ++++++-
 lib/thresholdtrigger.js   | 5 ++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/rotatingfilestream.js b/lib/rotatingfilestream.js
index 8a3a539..a976a03 100644
--- a/lib/rotatingfilestream.js
+++ b/lib/rotatingfilestream.js
@@ -112,7 +112,12 @@ function RotatingFileStream(options) {
 
                 var writeBuffer = new Buffer(str, 'utf8');
 
-                base.emit('logwrite', { logSize: writeBuffer.byteLength });
+                var emitinfo = {
+                    logSize: writeBuffer.byteLength,
+                    logstr: str
+                };
+
+                base.emit('logwrite', emitinfo);
 
                 if (stream) {
                     try {
diff --git a/lib/thresholdtrigger.js b/lib/thresholdtrigger.js
index ba80e28..95b6690 100644
--- a/lib/thresholdtrigger.js
+++ b/lib/thresholdtrigger.js
@@ -18,7 +18,10 @@ function ThresholdTrigger(options) {
 
     function logWrite(data) {
         if ((bytesWritten > 0) && (bytesWritten + data.logSize > threshold)) {
-            base.emit('rotate');
+
+            var log = JSON.parse(data.logstr);
+
+            base.emit('rotate', {date: log.time});
         } else {
             bytesWritten += data.logSize;
         }