[DO NOT LAND] Add some scripts to diagnose impact of crbug.com/684270.

tools/rietveld_missing_ipc_reviewers.py

Index: tools/rietveld_missing_ipc_reviewers.py
diff --git a/tools/rietveld_missing_ipc_reviewers.py b/tools/rietveld_missing_ipc_reviewers.py
new file mode 100755
index 0000000000000000000000000000000000000000..e18bd1e63815498afe24f48a276d97cec6d982bb
--- /dev/null
+++ b/tools/rietveld_missing_ipc_reviewers.py
@@ -0,0 +1,128 @@
+#!/usr/bin/env python
+# Copyright 2017 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.
+
+from __future__ import print_function
+
+
+import argparse
+import json
+import os
+import subprocess
+import string
+import sys
+import urllib2
+
+
+def main(argv):
+  parser = argparse.ArgumentParser()
+  parser.add_argument('revisions', action='store')
+  args = parser.parse_args(argv)
+
+  # From ipc/SECURITY_OWNERS
+  security_owners = ['dcheng@chromium.org',
+                     'jln@chromium.org',
+                     'kenrb@chromium.org',
+                     'meacer@chromium.org',
+                     'mbarbella@chromium.org',
+                     'mkwst@chromium.org',
+                     'nasko@chromium.org',
+                     'ochang@chromium.org',
+                     'palmer@chromium.org',
+                     'rickyz@chromium.org',
+                     'rsesek@chromium.org',
+                     'tsepez@chromium.org',
+                     'wfh@chromium.org',]
+
+  try:
+    affected_revisions = git_log(args.revisions)
+    print("There are %d affected revisions." % len(affected_revisions))
+
+    affected_cls = cls_from_revisions(affected_revisions)
+    print("There are %d potentially affected CLs." % len(affected_cls))
+    for cl in affected_cls:
+      issue = rietveld_props_for_issue(cl)
+      approvers = rietveld_approvers(issue)
+      has_security_reviewer = reduce(lambda x,y: x or (y in security_owners), approvers, False)
+      if not has_security_reviewer:
+        print('http://codereview.chromium.org/%d (approvers:%s)' % (cl, ", ".join(approvers)))
+
+    #props = rietveld_props_for_issue(args.issue)
+    #for approver in rietveld_approvers_for_issue(args.issue):
+    #  print(approver)
+    #return 0
+  except Exception as e:
+    print('Exception raised: %s' % str(e), file=sys.stderr)
+    return 1
+
+
+def git(args):
+  command = subprocess.Popen(['/usr/bin/git'] + args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  output = command.stdout.readlines()
+  if command.stderr.read():
+    raise Exception("git failed: (" + repr(args) + ")")
+  return output
+
+
+def git_show_raw(revision):
+  return git(['show', '--format=raw', '--name-only', revision])
+
+
+def cls_from_revisions(affected_revisions):
+  affected_cls = set()
+  for revision in affected_revisions:
+    revision_cls = set()
+    lines = git_show_raw(revision)
+    while lines and lines[0].rstrip() and lines[0][0] not in string.whitespace:
+      line, lines = lines[0], lines[1:]
+    while lines and lines[0] and lines[0][0] in string.whitespace:
+      line, lines = lines[0].strip(), lines[1:]
+      if line[:11] == 'Review-Url:':
+        cl_url_parts = line[11:].strip().split('/')
+        if cl_url_parts[0] != 'https:' or cl_url_parts[1] != '':
+          raise Exception("Strange CL URL format: " + repr(cl_url_parts))
+        revision_cls.add(int(cl_url_parts[3].split()[0]))
+    while lines:
+      line, lines = lines[0].strip(), lines[1:]
+      if line[-6:] == '.mojom':
+        affected_cls |= revision_cls
+  return sorted(list(affected_cls))
+
+#      if (
+#     lines = map(lambda x: x.strip(), git_show_raw(revision))
+#     lines = filter(lambda x: x[:44] == 'Review-Url: https://codereview.chromium.org/', lines)
+#     if not lines:
+#       raise "revision %s has no CL!" % revision
+#     for line in lines:
+#       cl = int(line[44:])
+#       affected_cls.add(cl)
+#  return sorted(list(affected_cls))
+
+
+def git_log(revisions):
+  return map(lambda x: x.split()[0],
+             git(['log', '--format=oneline', revisions]))
+
+
+def rietveld_props_for_issue(issue):
+  """Returns a dictionary of properties, including messages, for the issue."""
+
+  url = 'https://codereview.chromium.org/api/%d?messages=true' % issue
+  fp = None
+  try:
+    fp = urllib2.urlopen(url)
+    return json.load(fp)
+  finally:
+    if fp:
+      fp.close()
+
+
+def rietveld_approvers(props):
+  """Returns a sorted list of the approvers, from an issue's props."""
+  messages = props.get('messages', [])
+  return sorted(set(m['sender'] for m in messages if m.get('approval')))
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))