Upload file to app engine and generate public url for dmprof visualizer.

tools/deep_memory_profiler/visualizer/app.py

+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import jinja2
+import os
+import urllib
+import webapp2
+
+from google.appengine.ext import blobstore
+from google.appengine.ext.webapp import blobstore_handlers
+
+import services
+
+
+JINJA_ENVIRONMENT = jinja2.Environment(
+  loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
+  extensions=['jinja2.ext.autoescape'])
+
+
+class MainPage(webapp2.RequestHandler):
+  """Show breakdown with received profiler-id and template-id. If nothing was
+  received, show blank page waiting user to upload file."""
+  def get(self):
+    page_template = JINJA_ENVIRONMENT.get_template('index.html')
+    upload_url = blobstore.create_upload_url('/upload')
+
+    # Get profiler id and template id from url query.
+    run_id = self.request.get('run_id')
+    tmpl_id = self.request.get('tmpl_id')
+    upload_msg = self.request.get('upload_msg')
+
+    template_values = {
+      'upload_url': upload_url,
+      'upload_msg': upload_msg
+    }
+
+    if run_id and tmpl_id:

[Dai Mikurube (NOT FULLTIME), 2013/09/24 10:13:09]

It looks you added 'null' ones in Patch Set 5. Weren't they required ones? My
comment meant that the string 'null' doesn't have no meaning.

[junjianx, 2013/09/24 10:25:20]

I moved verification of these two variables to the index.html template.
I think it looks more elegant.

+      template_values['json'] = services.GetProfiler(run_id)
+      template_values['template'] = services.GetTemplate(tmpl_id)
+
+    self.response.write(page_template.render(template_values))
+
+
+class UploadHandler(blobstore_handlers.BlobstoreUploadHandler):
+  """Handle file uploading with BlobstoreUploadHandler. BlobstoreUploadHandler
+  can deal with files overweighing size limitation within one HTTP connection so
+  that user can upload large json file."""
+  def post(self):
+    blob_info = self.get_uploads('file')[0]
+
+    run_id = services.CreateProfiler(blob_info)
+    default_key = services.CreateTemplates(blob_info)
+
+    # TODO(junjianx): Validation of uploaded file should be done separately.
+    if not default_key:
+      # Jump to home page with error message.
+      req_params = {
+        'upload_msg': 'No default key was found.'

[sullivan, 2013/09/24 12:29:21]

Maybe 'No default template key was found'? FWIW, I've had very good luck with
users understanding descriptive error messages and either filing good bug
reports or being able to address the issue themselves.

+      }
+    else:
+      # Jump to new graph page using default template.
+      req_params = {
+        'run_id': run_id,
+        'tmpl_id': default_key.urlsafe()
+      }
+
+    self.redirect('/?' + urllib.urlencode(req_params))
+
+
+application = webapp2.WSGIApplication([
+  ('/', MainPage),
+  ('/upload', UploadHandler)
+], debug=True)