labhub.py: add migrate_issue plugin

migrate_issue plugin that adds ability to
migrate an issue from a source repo to
target repo, both owned by the org.

Issue title, issue description and all comments
are copied with a few additional details appended
to the description and comments. Source issue is
referenced in the target issue and closed after
the migration is completed.

Closes coala#518

plugins/labhub.py

@@ -381,3 +381,87 @@ def pr_stats(self, msg, match):
                     state=type(self).community_state(pr_count)
                  )
         yield reply
+
+    @re_botcmd(pattern=r'^migrate\s+https://(github|gitlab)\.com/([^/]+)/([^/]+)/+issues/(\d+)\s+https://(github|gitlab)\.com/([^/]+)/([^/]+)/*$',  # Ignore LineLengthBear, PyCodeStyleBear
+               # Ignore LineLengthBear, PyCodeStyleBear
+               re_cmd_name_help='migrate <complete-source-issue-URL> <complete-target-repo-URL>',
+               flags=re.IGNORECASE)
+    def migrate_issue(self, msg, match):
+        """
+        Migrate an issue from source repo
+        to target repo owned by the org
+        """
+        source_host = match.group(1)
+        source_org = match.group(2)
+        source_repo = match.group(3)
+        issue_number = match.group(4)
+        target_host = match.group(5)
+        target_org = match.group(6)
+        target_repo = match.group(7)
+
+        user = msg.frm.nick
+
+        if source_org != self.GH_ORG_NAME and source_org != self.GL_ORG_NAME:
+            return 'Source repository not owned by our org.'
+
+        if target_org != self.GH_ORG_NAME and target_org != self.GL_ORG_NAME:
+            return 'Target repository not owned by our org.'
+
+        if source_repo not in self.REPOS:
+            return 'Source repository does not exist.'
+
+        if target_repo not in self.REPOS:
+            return 'Target repository does not exist.'
+
+        if not self.TEAMS[self.GH_ORG_NAME + ' maintainers'].is_member(user):
+            return tenv().get_template(
+                'labhub/errors/not-maintainer.jinja2.md'
+            ).render(
+                action='migrate issues',
+                target=user,
+            )
+
+        try:
+            source_issue = self.REPOS[source_repo].get_issue(int(issue_number))
+            source_labels = source_issue.labels
+
+        except RuntimeError as err:
+            sterr, errno = err.args
+            if errno == 404:
+                return 'Issue does not exist!'
+            else:
+                raise RuntimeError(sterr, errno)
+
+        if str(source_issue.state) != 'open':
+            return 'Issue must be open in order to be migrated!'
+
+        source_url = 'https://{}.com/{}/{}/issues/{}'.format(
+            source_host, source_org, source_repo, issue_number)
+
+        ext_msg = ('\n\nThis is a migrated issue originally opened by @{} as {}'
+                   ' and was migrated by @{}')
+        target_issue_desc = source_issue.description.rstrip() + ext_msg.format(
+            source_issue.author.username, source_url, str(user))
+        target_issue = self.REPOS[target_repo].create_issue(
+            source_issue.title, target_issue_desc)
+        target_issue.labels = source_labels
+
+        comment_ext = '\n\nOriginally commented by @{} on {} UTC'
+
+        for comment in source_issue.comments:
+            target_comm = comment.body.rstrip() + comment_ext.format(
+                comment.author.username, str(comment.updated))
+            target_issue.add_comment(target_comm)
+
+        target_url = 'https://{}.com/{}/{}/issues/{}'.format(
+            target_host, target_org, target_repo, target_issue.number)
+
+        migrate_comm = 'Issue has been migrated to this [repository]({}) by @{}'
+        source_issue.add_comment(migrate_comm.format(
+            target_url, str(user)))
+
+        source_labels.add('Invalid')
+        source_issue.labels = source_labels
+        source_issue.close()
+
+        return 'Issue has been successfully migrated: {}'.format(target_url)

tests/labhub_test.py

@@ -344,3 +344,111 @@ def test_invite_me(self):
                               'Command \"hey\" / \"hey there\" not found.')
         with self.assertRaises(queue.Empty):
              testbot.pop_message()
+
+    def test_migrate_issue(self):
+        plugins.labhub.GitHub = create_autospec(IGitt.GitHub.GitHub.GitHub)
+        plugins.labhub.GitLab = create_autospec(IGitt.GitLab.GitLab.GitLab)
+        labhub, testbot = plugin_testbot(plugins.labhub.LabHub, logging.ERROR)
+        labhub.activate()
+
+        labhub.REPOS = {
+            'a': self.mock_repo,
+            'b': self.mock_repo
+        }
+
+        mock_maint_team = create_autospec(github3.orgs.Team)
+        mock_maint_team.is_member.return_value = False
+
+        labhub.TEAMS = {
+            'coala maintainers': mock_maint_team,
+            'coala developers': self.mock_team,
+            'coala newcomers': self.mock_team
+        }
+        cmd = '!migrate https://github.com/{}/{}/issues/{} https://github.com/{}/{}/'
+        issue_check = 'Issue desc\n\nThis is a migrated issue originally opened by @{} as {} and was migrated by @{}'
+        comment_check = 'Comment body\n\nOriginally commented by @{} on {} UTC'
+
+        # Not a maintainer
+        testbot.assertCommand(cmd.format('coala', 'a', '21', 'coala', 'b'),
+                              'you are not a maintainer!')
+        # Unknown first org
+        testbot.assertCommand(cmd.format('coa', 'a', '23', 'coala', 'b'),
+                              'Source repository not owned by our org')
+        # Unknown second org
+        testbot.assertCommand(cmd.format('coala', 'a', '23', 'coa', 'b'),
+                              'Target repository not owned by our org')
+        # Repo does not exist
+        testbot.assertCommand(cmd.format('coala', 'c', '23', 'coala', 'b'),
+                              'Source repository does not exist')
+        # Repo does not exist
+        testbot.assertCommand(cmd.format('coala', 'a', '23', 'coala', 'e'),
+                              'Target repository does not exist')
+        # No issue exists
+        mock_maint_team.is_member.return_value = True
+        self.mock_repo.get_issue = Mock(side_effect=RuntimeError('Error message', 404))
+        testbot.assertCommand(cmd.format('coala', 'a', '21', 'coala', 'b'),
+                              'Issue does not exist!')
+        # Runtime error
+        mock_maint_team.is_member.return_value = True
+        self.mock_repo.get_issue = Mock(side_effect=RuntimeError('Error message', 403))
+        testbot.assertCommand(cmd.format('coala', 'a', '21', 'coala', 'b'),
+                              'Computer says')
+        # Issue closed
+        mock_maint_team.is_member.return_value = True
+        mock_issue = create_autospec(IGitt.GitHub.GitHub.GitHubIssue)
+        self.mock_repo.get_issue = Mock(return_value=mock_issue)
+        mock_issue.labels = PropertyMock()
+        mock_issue.state = PropertyMock()
+        mock_issue.state = 'closed'
+        testbot.assertCommand(cmd.format('coala', 'a', '21', 'coala', 'b'),
+                              'Issue must be open')
+        # Migrate issue
+        mock_maint_team.is_member.return_value = True
+        mock_issue = create_autospec(IGitt.GitHub.GitHub.GitHubIssue)
+        mock_issue2 = create_autospec(IGitt.GitHub.GitHub.GitHubIssue)
+
+        self.mock_repo.get_issue = Mock(return_value=mock_issue)
+        label_prop = PropertyMock(return_value=set())
+        type(mock_issue).labels = label_prop
+        mock_issue.title = PropertyMock()
+        mock_issue.title = 'Issue title'
+        mock_issue.description = PropertyMock()
+        mock_issue.description = 'Issue desc'
+        mock_issue.state = PropertyMock()
+        mock_issue.state = 'open'
+        mock_issue.author.username = PropertyMock()
+        mock_issue.author.username = 'random-access7'
+
+        self.mock_repo.create_issue = Mock(return_value=mock_issue2)
+        mock_issue2.labels = PropertyMock()
+        mock_issue2.number = PropertyMock()
+        mock_issue2.number = 45
+
+        mock_comment = create_autospec(IGitt.GitHub.GitHub.GitHubComment)
+        mock_comment2 = create_autospec(IGitt.GitHub.GitHub.GitHubComment)
+
+        mock_issue.comments = PropertyMock()
+        mock_issue.comments = list()
+        mock_issue.comments.append(mock_comment)
+        mock_comment.author.username = PropertyMock()
+        mock_comment.author.username = 'random-access7'
+        mock_comment.body = PropertyMock()
+        mock_comment.body = 'Comment body'
+        mock_comment.updated = PropertyMock()
+        mock_comment.updated = '07/04/2018'
+
+        testbot.assertCommand(cmd.format('coala', 'a', '21', 'coala', 'b'),
+                              'successfully migrated:')
+
+        self.mock_repo.get_issue.assert_called_with(21)
+
+        self.mock_repo.create_issue.assert_called_with('Issue title',
+        issue_check.format('random-access7', 'https://github.com/coala/a/issues/21', 'None'))
+
+        mock_issue2.add_comment.assert_called_with(comment_check.format('random-access7',
+        '07/04/2018'))
+
+        mock_issue.add_comment.assert_called_with(
+        'Issue has been migrated to this [repository](https://github.com/coala/b/issues/45) by @None')
+
+        mock_issue.close.assert_called_with()