chrome/test/ispy/server/main_view_handler.py

   1 # Copyright 2013 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 """Request handler to serve the main_view page."""
   6
   7 import jinja2
   8 import json
   9 import os
  10 import re
  11 import sys
  12 import webapp2
  13
  14 import ispy_api
  15 from common import constants
  16 from common import ispy_utils
  17
  18 import gs_bucket
  19 import views
  20
  21 JINJA = jinja2.Environment(
  22     loader=jinja2.FileSystemLoader(os.path.dirname(views.__file__)),
  23     extensions=['jinja2.ext.autoescape'])
  24
  25
  26 class MainViewHandler(webapp2.RequestHandler):
  27   """Request handler to serve the main_view page."""
  28
  29   def get(self):
  30     """Handles a get request to the main_view page.
  31
  32     If the test_run parameter is specified, then a page displaying all of
  33     the failed runs in the test_run will be shown. Otherwise a view listing
  34     all of the test_runs available for viewing will be displayed.
  35     """
  36     test_run = self.request.get('test_run')
  37     bucket = gs_bucket.GoogleCloudStorageBucket(constants.BUCKET)
  38     ispy = ispy_utils.ISpyUtils(bucket)
  39     # Load the view.
  40     if test_run:
  41       self._GetForTestRun(test_run, ispy)
  42       return
  43     self._GetAllTestRuns(ispy)
  44
  45   def _GetAllTestRuns(self, ispy):
  46     """Renders a list view of all of the test_runs available in GS.
  47
  48     Args:
  49       ispy: An instance of ispy_api.ISpyApi.
  50     """
  51     template = JINJA.get_template('list_view.html')
  52     data = {}
  53     max_keys = 1000
  54     marker = 'failures/%s' % self.request.get('marker')
  55     test_runs = list([path.split('/')[1] for path in
  56        ispy.GetAllPaths('failures/', max_keys=max_keys,
  57                         marker=marker, delimiter='/')])
  58     base_url = '/?test_run=%s'
  59     next_url = '/?marker=%s' % test_runs[-1]
  60     data['next_url'] = next_url
  61     data['links'] = [(test_run, base_url % test_run) for test_run in test_runs]
  62     self.response.write(template.render(data))
  63
  64   def _GetForTestRun(self, test_run, ispy):
  65     """Renders a sorted list of failure-rows for a given test_run.
  66
  67     This method will produce a list of failure-rows that are sorted
  68     in descending order by number of different pixels.
  69
  70     Args:
  71       test_run: The name of the test_run to render failure rows from.
  72       ispy: An instance of ispy_api.ISpyApi.
  73     """
  74     paths = set([path for path in ispy.GetAllPaths('failures/' + test_run)
  75                  if path.endswith('actual.png')])
  76     can_rebaseline = ispy_api.ISpyApi(
  77         ispy.cloud_bucket).CanRebaselineToTestRun(test_run)
  78     rows = [self._CreateRow(test_run, path, ispy) for path in paths]
  79
  80     # Function that sorts by the different_pixels field in the failure-info.
  81     def _Sorter(a, b):
  82       return cmp(b['percent_different'],
  83                  a['percent_different'])
  84     template = JINJA.get_template('main_view.html')
  85     self.response.write(
  86         template.render({'comparisons': sorted(rows, _Sorter),
  87                          'test_run': test_run,
  88                          'can_rebaseline': can_rebaseline}))
  89
  90   def _CreateRow(self, test_run, path, ispy):
  91     """Creates one failure-row.
  92
  93     This method builds a dictionary with the data necessary to display a
  94     failure in the main_view html template.
  95
  96     Args:
  97       test_run: The name of the test_run the failure is in.
  98       path: A path to the failure's actual.png file.
  99       ispy: An instance of ispy_api.ISpyApi.
 100
 101     Returns:
 102       A dictionary with fields necessary to render a failure-row
 103         in the main_view html template.
 104     """
 105     res = {}
 106     res['expectation'] = path.lstrip('/').split('/')[2]
 107     res['test_run'] = test_run
 108     res['info'] = json.loads(ispy.cloud_bucket.DownloadFile(
 109         ispy_utils.GetFailurePath(res['test_run'], res['expectation'],
 110                                   'info.txt')))
 111     expected = ispy_utils.GetExpectationPath(
 112         res['expectation'], 'expected.png')
 113     diff = ispy_utils.GetFailurePath(test_run, res['expectation'], 'diff.png')
 114     res['percent_different'] = res['info']['fraction_different'] * 100
 115     res['expected_path'] = expected
 116     res['diff_path'] = diff
 117     res['actual_path'] = path
 118     res['expected'] = ispy.cloud_bucket.GetImageURL(expected)
 119     res['diff'] = ispy.cloud_bucket.GetImageURL(diff)
 120     res['actual'] = ispy.cloud_bucket.GetImageURL(path)
 121     return res