git cl: reduce number of Gerrit RPCs in status check.

Also fixes git cl description <url> by propagating codereview host information
in all cases.

BUG=681704
R=agable@chromium.org

Change-Id: Ia79c10b19d72b5a8797a1428ad8a79c8f4480901
Reviewed-on: https://chromium-review.googlesource.com/431036Reviewed-by: Aaron Gable <agable@chromium.org>

git_cl.py

@@ -1785,13 +1785,13 @@ class _ChangelistCodereviewBase(object):
 
 
 class _RietveldChangelistImpl(_ChangelistCodereviewBase):
-  def __init__(self, changelist, auth_config=None, rietveld_server=None):
+  def __init__(self, changelist, auth_config=None, codereview_host=None):
     super(_RietveldChangelistImpl, self).__init__(changelist)
     assert settings, 'must be initialized in _ChangelistCodereviewBase'
-    if not rietveld_server:
+    if not codereview_host:
       settings.GetDefaultServerUrl()
 
-    self._rietveld_server = rietveld_server
+    self._rietveld_server = codereview_host
     self._auth_config = auth_config or auth.make_auth_config()
     self._props = None
     self._rpc_server = None
@@ -2208,16 +2208,21 @@ class _RietveldChangelistImpl(_ChangelistCodereviewBase):
 
 
 class _GerritChangelistImpl(_ChangelistCodereviewBase):
-  def __init__(self, changelist, auth_config=None):
+  def __init__(self, changelist, auth_config=None, codereview_host=None):
     # auth_config is Rietveld thing, kept here to preserve interface only.
     super(_GerritChangelistImpl, self).__init__(changelist)
     self._change_id = None
     # Lazily cached values.
-    self._gerrit_server = None  # e.g. https://chromium-review.googlesource.com
     self._gerrit_host = None    # e.g. chromium-review.googlesource.com
+    self._gerrit_server = None  # e.g. https://chromium-review.googlesource.com
     # Map from change number (issue) to its detail cache.
     self._detail_cache = {}
 
+    if codereview_host is not None:
+      assert not codereview_host.startswith('https://'), codereview_host
+      self._gerrit_host = codereview_host
+      self._gerrit_server = 'https://%s' % codereview_host
+
   def _GetGerritHost(self):
     # Lazy load of configs.
     self.GetCodereviewServer()
@@ -2444,6 +2449,11 @@ class _GerritChangelistImpl(_ChangelistCodereviewBase):
     issue = issue or self.GetIssue()
     assert issue, 'issue is required to query Gerrit'
 
+    # Optimization to avoid multiple RPCs:
+    if (('CURRENT_REVISION' in options or 'ALL_REVISIONS' in options) and
+        'CURRENT_COMMIT' not in options):
+      options.append('CURRENT_COMMIT')
+
     # Normalize issue and options for consistent keys in cache.
     issue = str(issue)
     options = [o.upper() for o in options]
@@ -3926,10 +3936,10 @@ def CMDdescription(parser, args):
   options, args = parser.parse_args(args)
   _process_codereview_select_options(parser, options)
 
-  target_issue = None
+  target_issue_arg = None
   if len(args) > 0:
-    target_issue = ParseIssueNumberArgument(args[0])
-    if not target_issue.valid:
+    target_issue_arg = ParseIssueNumberArgument(args[0])
+    if not target_issue_arg.valid:
       parser.print_help()
       return 1
 
@@ -3939,10 +3949,9 @@ def CMDdescription(parser, args):
       'auth_config': auth_config,
       'codereview': options.forced_codereview,
   }
-  if target_issue:
-    kwargs['issue'] = target_issue.issue
-    if options.forced_codereview == 'rietveld':
-      kwargs['rietveld_server'] = target_issue.hostname
+  if target_issue_arg:
+    kwargs['issue'] = target_issue_arg.issue
+    kwargs['codereview_host'] = target_issue_arg.hostname
 
   cl = Changelist(**kwargs)
 

tests/git_cl_test.py

@@ -1677,7 +1677,7 @@ class TestGitCl(TestCase):
 
       self.calls += [
         (('GetChangeDetail', git_short_host + '-review.googlesource.com',
-          '123456', ['ALL_REVISIONS']),
+          '123456', ['ALL_REVISIONS', 'CURRENT_COMMIT']),
          {
            'current_revision': '7777777777',
            'revisions': {
@@ -2042,13 +2042,7 @@ class TestGitCl(TestCase):
     out = StringIO.StringIO()
     self.mock(git_cl.sys, 'stdout', out)
     self.calls = [
-        ((['git', 'symbolic-ref', 'HEAD'],), 'master'),
-        ((['git', 'config', 'branch.master.gerritserver'],), CERR1),
-        ((['git', 'config', 'branch.master.merge'],), 'refs/heads/master'),
-        ((['git', 'config', 'branch.master.remote'],), 'origin'),
-        ((['git', 'config', 'remote.origin.url'],),
-         'https://git.review.org/repo.git'),
-        (('GetChangeDetail', 'git-review.review.org',
+        (('GetChangeDetail', 'code.review.org',
           '123123', ['CURRENT_REVISION', 'CURRENT_COMMIT']),
          {
            'current_revision': 'sha1',
@@ -2382,7 +2376,7 @@ class TestGitCl(TestCase):
          ['DETAILED_ACCOUNTS']),
          {'owner': {'email': 'owner@e.mail'}}),
         (('GetChangeDetail', 'chromium-review.googlesource.com', '123456',
-         ['ALL_REVISIONS']), {
+         ['ALL_REVISIONS', 'CURRENT_COMMIT']), {
           'project': 'depot_tools',
           'revisions': {
             'deadbeaf':  {