Make the rebaseline log server resilient to large logs.

Right now when it exceeds the appengine storage limit for a single
entry it 500s. Instead, just create a new entry. This isn't totally
ideal. Ideally we'd create a new entry but link it to the old
one so we can show it correctly in the UI, but that's too much work.

NOTRY=true
BUG=378490

Review URL: https://codereview.chromium.org/304303003

git-svn-id: svn://svn.chromium.org/blink/trunk@175230 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Tools/RebaselineLogServer/main.py

@@ -32,6 +32,7 @@ import webapp2
 
 from google.appengine.ext import ndb
 from google.appengine.ext.webapp import template
+from google.appengine.ext.db import BadRequestError
 
 # A simple log server for rebaseline-o-matic.
 #
@@ -100,7 +101,12 @@ class UpdateLog(webapp2.RequestHandler):
         if new_entry or not log_entries:
             log_entry = LogEntry(content=new_log_data, is_no_needs_rebaseline=no_needs_rebaseline)
 
-        log_entry.put()
+        try:
+            log_entry.put()
+        except BadRequestError:
+            out = "Created new log entry because the previous one exceeded the max length."
+            LogEntry(content=new_log_data, is_no_needs_rebaseline=no_needs_rebaseline).put()
+
         self.response.out.write(out)
 
 

third_party/WebKit/Tools/RebaselineLogServer/main_unittest.py

@@ -71,6 +71,16 @@ class TestHandlers(unittest.TestCase):
         self.assertEqual(response.status_int, 200)
         self.assertEqual(response.body, 'Added to existing log entry.')
 
+        request = webapp2.Request.blank('/updatelog')
+        request.method = 'POST'
+        request.POST[main.LOG_PARAM] = 'x' * 1000000
+        request.POST[main.NEW_ENTRY_PARAM] = 'off'
+        request.POST[main.NO_NEEDS_REBASELINE_PARAM] = 'off'
+
+        response = request.get_response(main.app)
+        self.assertEqual(response.status_int, 200)
+        self.assertEqual(response.body, 'Created new log entry because the previous one exceeded the max length.')
+
         request = webapp2.Request.blank('/updatelog')
         request.method = 'POST'
         request.POST[main.LOG_PARAM] = 'data to log'