Merge pull request #4 from vbogdanov/master

a fix for circular references in the record

lib/bunyan-stackdriver.js

@@ -1,6 +1,7 @@
 var util = require('util');
 var logging = require('@google-cloud/logging');
 var Writable = require('stream').Writable;
+var destroyCircular = require('destroy-circular');
 
 const nameFromLevel = {
   10: 'trace',
@@ -88,6 +89,8 @@ BunyanStackDriver.prototype._write = function write(record, encoding, callback)
     timestamp = record.time;
   }
 
+  //This might slow down the logging a bit, but will protect against circular references
+  record = destroyCircular(record);
   strictJSON(record);
 
   var entry = this.log.entry(this.resource, record);

package.json

@@ -21,7 +21,8 @@
   },
   "homepage": "https://github.com/mlazarov/bunyan-stackdriver",
   "dependencies": {
-    "@google-cloud/logging": "^0.1.1"
+    "@google-cloud/logging": "^0.1.1",
+    "destroy-circular": "^1.1.0"
   },
   "devDependencies": {
     "bunyan": "^1.3.3"