Add script to verify that image files exist for every actual_result checksum

Should help with https://code.google.com/p/skia/issues/detail?id=1410
(SkipBuildbotRuns)

R=epoger@google.com

Review URL: https://codereview.chromium.org/18743006

git-svn-id: http://skia.googlecode.com/svn/trunk@10017 2bbb7eff-a529-9590-31e7-b0007b416f81

tools/verify_images_for_gm_results.py

@@ -0,0 +1,161 @@
+#!/usr/bin/python
+
+# Copyright (c) 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.
+
+
+""" Look through skia-autogen, searching for all checksums which should have
+corresponding files in Google Storage, and verify that those files exist. """
+
+
+import json
+import posixpath
+import re
+import subprocess
+import sys
+
+
+AUTOGEN_URL = 'http://skia-autogen.googlecode.com/svn/gm-actual'
+GS_URL = 'gs://chromium-skia-gm/gm'
+TEST_NAME_PATTERN = re.compile('(\S+)_(\S+).png')
+
+
+def FileNameToGSURL(filename, hash_type, hash_value):
+  """ Convert a file name given in a checksum file to the URL of the
+  corresponding image file in Google Storage.
+
+  filename: string; the file name to convert. Takes the form specified by
+      TEST_NAME_PATTERN.
+  hash_type: string; the type of the checksum.
+  hash_value: string; the checksum itself.
+  """
+  test_name = TEST_NAME_PATTERN.match(filename).group(1)
+  if not test_name:
+    raise Exception('Invalid test name for file: %s' % filename)
+  return '%s/%s/%s/%s.png' % (GS_URL, hash_type, test_name, hash_value)
+
+
+def FindURLSInJSON(json_file, gs_urls):
+  """ Extract Google Storage URLs from a JSON file in svn, adding them to the
+  gs_urls dictionary.
+
+  json_file: string; URL of the JSON file.
+  gs_urls: dict; stores Google Storage URLs as keys and lists of the JSON files
+      which reference them.
+
+  Example gs_urls:
+  { 'gs://chromium-skia-gm/gm/sometest/12345.png': [
+      'http://skia-autogen.googlecode.com/svn/gm-actual/base-macmini/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Debug/base-macmini/actual-results.json',
+      'http://skia-autogen.googlecode.com/svn/gm-actual/base-macmini-10_8/Test-Mac10.8-MacMini4.1-GeForce320M-x86-Debug/base-macmini-10_8/actual-results.json',
+    ]
+  }
+  """
+  output = subprocess.check_output(['svn', 'cat', json_file])
+  json_content = json.loads(output)
+  for dict_type in ['actual-results']:
+    for result_type in json_content[dict_type]:
+      if json_content[dict_type][result_type]:
+        for result in json_content[dict_type][result_type].keys():
+          hash_type, hash_value = json_content[dict_type][result_type][result]
+          gs_url = FileNameToGSURL(result, hash_type, str(hash_value))
+          if gs_urls.get(gs_url):
+            gs_urls[gs_url].append(json_file)
+          else:
+            gs_urls[gs_url] = [json_file]
+
+
+def _FindJSONFiles(url, json_files):
+  """ Helper function for FindJsonFiles. Recursively explore the repository,
+  adding JSON files to a list.
+
+  url: string; URL of the repository (or subdirectory thereof) to explore.
+  json_files: list to which JSON file urls will be added.
+  """
+  proc = subprocess.Popen(['svn', 'ls', url], stdout=subprocess.PIPE,
+                          stderr=subprocess.STDOUT)
+  if proc.wait() != 0:
+    raise Exception('Failed to list svn directory.')
+  output = proc.communicate()[0].splitlines()
+  subdirs = []
+  for item in output:
+    if item.endswith(posixpath.sep):
+      subdirs.append(item)
+    elif item.endswith('.json'):
+      json_files.append(posixpath.join(url, item))
+    else:
+      print 'Warning: ignoring %s' % posixpath.join(url, item)
+  for subdir in subdirs:
+    _FindJSONFiles(posixpath.join(url, subdir), json_files)
+
+
+def FindJSONFiles(url):
+  """ Recursively explore the given repository and return a list of the JSON
+  files it contains.
+
+  url: string; URL of the repository to explore.
+  """
+  print 'Searching for JSON files in %s' % url
+  json_files = []
+  _FindJSONFiles(url, json_files)
+  return json_files
+
+
+def FindURLs(url):
+  """ Find Google Storage URLs inside of JSON files in the given repository.
+  Returns a dictionary whose keys are Google Storage URLs and values are lists
+  of the JSON files which reference them.
+
+  url: string; URL of the repository to explore.
+
+  Example output:
+  { 'gs://chromium-skia-gm/gm/sometest/12345.png': [
+      'http://skia-autogen.googlecode.com/svn/gm-actual/base-macmini/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Debug/base-macmini/actual-results.json',
+      'http://skia-autogen.googlecode.com/svn/gm-actual/base-macmini-10_8/Test-Mac10.8-MacMini4.1-GeForce320M-x86-Debug/base-macmini-10_8/actual-results.json',
+    ]
+  }
+  """
+  gs_urls = {}
+  for json_file in FindJSONFiles(url):
+    print 'Looking for checksums in %s' % json_file
+    FindURLSInJSON(json_file, gs_urls)
+  return gs_urls
+
+
+def VerifyURL(url):
+  """ Verify that the given URL exists.
+
+  url: string; the Google Storage URL of the image file in question.
+  """
+  proc = subprocess.Popen(['gsutil', 'ls', url], stdout=subprocess.PIPE,
+                          stderr=subprocess.STDOUT)
+  if proc.wait() != 0:
+    return False
+  return True
+
+
+def VerifyURLs(urls):
+  """ Verify that each of the given URLs exists. Return a list of which URLs do
+  not exist.
+  
+  urls: dictionary; URLs of the image files in question.
+  """
+  print 'Verifying that images exist for URLs...'
+  missing = []
+  for url in urls.iterkeys():
+    if not VerifyURL(url):
+      print 'Missing: %s, referenced by: \n  %s' % (url, '\n  '.join(urls[url]))
+      missing.append(url)
+  return missing
+
+
+def Main():
+  urls = FindURLs(AUTOGEN_URL)
+  missing = VerifyURLs(urls)
+  if missing:
+    print 'Found %d Missing files.' % len(missing)
+    return 1
+
+
+if __name__ == '__main__':
+  sys.exit(Main())