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

tools/deep_memory_profiler/visualizer/services.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 json
+
+from google.appengine.ext import blobstore
+from google.appengine.ext import ndb
+
+
+class Profiler(ndb.Model):
+  """Profiler entity to store json data. Use run_id as its key.
+  Json data will be stored at blobstore, but can be referred by BlobKey."""
+  blob_key = ndb.BlobKeyProperty()
+
+
+class Template(ndb.Model):
+  """Template to breakdown profiler with multiple tags.
+  Use content as its key."""
+  content = ndb.JsonProperty()
+
+
+def CreateProfiler(blob_info):
+  """Create Profiler entity in database of uploaded file. Return run_id."""
+  json_str = blob_info.open().read()
+  json_obj = json.loads(json_str)
+
+  # Check the uniqueness of data run_id and store new one.
+  run_id = json_obj['run_id']
+  prof_key = ndb.Key('Profiler', run_id)
+  if not prof_key.get():
+    # Profile for this run_id does not exist
+    profiler = Profiler(id=run_id, blob_key=blob_info.key())
+    profiler.put()
+
+  return run_id
+
+
+def GetProfiler(run_id):
+  """Get Profiler entity from database of given run_id."""
+  # Get entity key.
+  profiler = ndb.Key('Profiler', run_id).get()
+  return blobstore.BlobReader(profiler.blob_key).read()
+
+
+def CreateTemplates(blob_info):
+  """Create Template entities for all templates of uploaded file. Return ndb.Key
+  of default template"""
+  json_str = blob_info.open().read()
+  json_obj = json.loads(json_str)
+
+  # Check the uniqueness of template content and store new one.
+  for tag, content in json_obj['templates'].iteritems():
+    content_str = json.dumps(content)
+    tmpl_key = ndb.Key('Template', content_str)
+    if tag == json_obj['default_template']:
+      default_key = tmpl_key
+    if not tmpl_key.get():
+      # Template of the same content does not exist.
+      template = Template(id=content_str, content=content)
+      template.put()
+
+  return default_key

[sullivan, 2013/09/20 13:59:51]

default_key doesn't get initialized, so won't you get an UnboundLocalError if
there is no default_key in the JSON? Wouldn't it be better to return None here,
and then present a helpful error message to the user?

[junjianx, 2013/09/24 05:53:53]

Done.

+
+
+def GetTemplate(tmpl_id):
+  """Get Template entity of given tmpl_id generated by ndb.Key."""
+  # Get entity key.
+  template = ndb.Key(urlsafe=tmpl_id).get()
+  return json.dumps(template.content)