Make bunyan defensive on res.header=null.

Fixes #244.
Also add test case for this and a couple recent `bunyan` crashers.

CHANGES.md

@@ -8,7 +8,7 @@ Known issues:
 
 ## bunyan 1.3.6 (not yet released)
 
-(nothing yet)
+- [issue #244] Make `bunyan` defensive on `res.header=null`.
 
 
 ## bunyan 1.3.5

bin/bunyan

@@ -929,12 +929,10 @@ function emitRecord(rec, line, opts, stylize) {
             // Typical JSON.stringify of a core node HttpResponse?)
             var headerTypes = {string: true, object: true};
             var headers;
-            if (res.header !== undefined && headerTypes[typeof (res.header)]) {
+            if (res.header && headerTypes[typeof (res.header)]) {
                 headers = res.header;
                 delete res.header;
-            } else if (res.headers !== undefined &&
-                headerTypes[typeof (res.headers)])
-            {
+            } else if (res.headers && headerTypes[typeof (res.headers)]) {
                 headers = res.headers;
                 delete res.headers;
             }

test/cli.test.js

@@ -1,12 +1,13 @@
 /*
- * Copyright (c) 2012 Trent Mick. All rights reserved.
+ * Copyright (c) 2015 Trent Mick. All rights reserved.
  *
  * Test the `bunyan` CLI.
  */
 
 var p = console.warn;
-var path = require('path');
 var exec = require('child_process').exec;
+var fs = require('fs');
+var path = require('path');
 var _ = require('util').format;
 var vasync = require('vasync');
 
@@ -401,11 +402,14 @@ test('robust req handling', function (t) {
 });
 
 // Some past crashes from issues.
-test('should not crash on these', function (t) {
+test('should not crash on corpus/old-crashers/*.log', function (t) {
+    var oldCrashers = fs.readdirSync(
+        path.resolve(__dirname, 'corpus/old-crashers'))
+        .filter(function (f) { return f.slice(-4) === '.log'; });
     vasync.forEachPipeline({
-        inputs: ['139.log', '144.log'],
+        inputs: oldCrashers,
         func: function (logName, next) {
-            exec(_('%s %s/corpus/%s', BUNYAN, __dirname, logName),
+            exec(_('%s %s/corpus/old-crashers/%s', BUNYAN, __dirname, logName),
                     function (err, stdout, stderr) {
                 next(err);
             });

test/corpus/old-crashers/233.log

@@ -0,0 +1 @@
+{"name":"server","hostname":"iZ25apt4ethZ","pid":958,"level":30,"req":{"method":"GET","url":"/ground/fetch?id=null","headers":{"host":"123.123.123.123","connection":"Keep-Alive","accept-encoding":"gzip"},"remoteAddress":"::ffff:123.123.123.123"},"res":{"headers":true,"content":{"status":0,"message":"success","messages":[]}},"msg":"Time used: 30ms","time":"2015-03-07T07:28:32.431Z","v":0}

test/corpus/old-crashers/242.log

@@ -0,0 +1 @@
+{"name":"AKP48","module":"Server","hostname":"AKP48.akpwebdesign.com","pid":32421,"level":60,"err":{"message":"Function.prototype.apply: Arguments list has wrong type","name":"TypeError","stack":[{},{},{},{},{},{}]},"msg":"Exception caught: TypeError: Function.prototype.apply: Arguments list has wrong type","time":"2015-04-13T04:03:46.206Z","v":0}

test/corpus/old-crashers/244.log

@@ -0,0 +1 @@
+{"name":"multichannel","hostname":"macbook-dev","pid":44973,"level":30,"res":{"statusCode":401,"header":null},"response":"{\"error\":\"InvalidCredentials\",\"description\":\"The access token provided has expired.\"}","msg":"","time":"2015-04-15T10:37:39.557Z","v":0}

test/corpus/old-crashers/README.md

@@ -0,0 +1,2 @@
+Log lines that used to crash `bunyan`.
+Typically the file name is the bunyan issue number.