def create_from_file(cls, proj, src_file):
        filename, extention = os.path.splitext(src_file)
        if extention not in cls.SRC_EXTENSIONS:
            return []

        tag_docs = []

        with open(src_file, 'r') as f:
            s = f.read()
            for comment in COMMENT_PATTERN.finditer(s):
                match = PHONELAB_DOC_PATTERN.search(comment.group('body'))
                if match is None:
                    continue
                try:
                    text = ' '.join([l.strip() for l in match.group(
                        'json').replace('*', '').splitlines()])
                    doc = json.loads(text)
                    tag_docs.append(TagDoc(doc, proj, src_file,
                                           s.count('\n', 0, comment.start()) + 1))
                except:
                    logger.exception("Invalid doc string in file %s: %s" %
                                     (src_file, match.group('json')))
                    logger.info("JSON Text: %s" % (text))
                    continue

        return tag_docs

    def fetch_project_flows(self, project):
        """
            获取project的flowid
            返回 flowid list
        """
        method = "GET"
        url = config["manager"]
        params = {
            "ajax": "fetchprojectflows",
            "project": project
        }
        content, ok = self.get_ajax(method, url, params)
        flowids = []
        if ok:
            try:
                res = json.loads(content)
                flowids = map(lambda e: e["flowId"], res["flows"])
            except Exception as e:
                logger.exception(e)
                return []

            logger.info(
                "fetch_project_flows {0} : {1} SUCCESS".format(
                    project, flowids))
            return flowids
        else:
            logger.info("fetch_project_flows {0} FAILED".format(project))

        return flowids

    def login():
        """
            利用config中的userame和password登陆
            返回是否成功
        """
        logger.info("login")
        if Azkaban.sid:
            return True
        ok = False
        for i in range(config["retry"]):
            try:
                params = {
                    'action': "login",
                    'username': config["username"],
                    'password': config["password"]
                }
                r = requests.post(config["manager"], params)
                content = r.text
                debug_print(content)
                Azkaban.sid = str(json.loads(content)["session.id"])
                ok = True
                break
            except Exception as e:
                logger.exception("login exception: {e}".format(e=e))

        logger.info("login update sid {0}".format(Azkaban.sid))
        return ok

def main():
    rel_info = ReleaseInfo()
    start_directory = os.getcwd()
    parse_args(rel_info)
    try:
        setup_test_branch(rel_info)
        merge_branches(rel_info)
        test_tag_doc(rel_info)

        if rel_info.args.merge_only:
            return

        build_platform(rel_info)
    except KeyboardInterrupt:
        pass
    except:
        logger.exception("[FAILED] Please check your changes. "\
                         "You can not pass this checker unless your branch "\
                         "can be merged without conflicts.")
        logger.info("Note: all repos are in test branch %s" % rel_info.test_branch)
    else:
        logger.info(
            "[PASS] Your changes can be successfully merged and build.")
    finally:
        cleanup(rel_info)
        os.chdir(start_directory)