__main__.py 7.29 KB
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#!/usr/bin/env python3
# coding: utf-8
#
# copyright 2020-2020 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of assignbot.
#
# Assignbot is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# Assignbot is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with assignbot.  If not, see <http://www.gnu.org/licenses/>.

import os
from argparse import ArgumentParser
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from random import choice, shuffle
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from datetime import datetime, timedelta

import yaml
import pandas as pd
from gitlab import Gitlab
from gitlab.exceptions import GitlabHttpError

from assignbot.s3_utils import download_file, upload_file

TO_REVIEW_LABEL = "To Review"
REVIEW_ACCESS_LEVEL = 30  # developper
CLIENT_PROJECT_TAG = "client-project"

STATE_FILENAME = "auto_assigned_reviewers.csv"


class ReviewAssigner:
    def __init__(self, gitlab_url, gitlab_token, users_preferences_filepath):
        self.cnx = Gitlab(gitlab_url, gitlab_token)
        self.user_preferences = self._load_users_preferences(users_preferences_filepath)
        self.review_states = self._load_review_states()

    def _load_users_preferences(self, users_preferences_filepath):
        with open(users_preferences_filepath) as fobj:
            state = yaml.load(fobj, Loader=yaml.Loader)
        return state or {}

    def _load_review_states(self):
        try:
            return pd.read_csv(
                download_file(STATE_FILENAME),
                index_col=0,
                parse_dates=[
                    2,
                ],
            )
        except Exception:  # XXX
            df = pd.DataFrame([], columns=["username", "datetime", "mr_url"])
            df.datetime = pd.to_datetime(df.datetime)
            return df

    def save_review_states(self):
        upload_file(STATE_FILENAME, self.review_states.to_csv().encode("utf-8"))

    def _get_user_nb_auto_review_since(self, username, since):
        oldest_date = datetime.now() - since
        user_reviews = self.review_states.query(f"username == '{username}'")
        return sum(user_reviews.datetime > oldest_date)

    def get_user_nb_auto_review_this_day(self, username):
        return self._get_user_nb_auto_review_since(username, timedelta(hours=20))

    def get_user_nb_auto_review_this_week(self, username):
        return self._get_user_nb_auto_review_since(username, timedelta(days=6))

    def user_has_already_been_assigned_to_this_mr(self, user, merge_request):
        return self.review_states.query(
            f"username == '{user.username}' and " f"mr_url == '{merge_request.web_url}'"
        ).empty

    def user_can_review(self, user, project, merge_request):
        try:
            user_preferences = self.user_preferences[user.username]
        except KeyError:
            # the user did not specify any preferences
            # let's assume that s·he is not volunteer
            return False

        max_auto_review_per_week = user_preferences["max_auto_review_per_week"]
        max_auto_review_per_day = user_preferences["max_auto_review_per_day"]

        auto_review_this_day = self.get_user_nb_auto_review_this_day(user.username)
        auto_review_this_week = self.get_user_nb_auto_review_this_week(user.username)

        return (
            user.access_level >= REVIEW_ACCESS_LEVEL
            and user.state == "active"
            and auto_review_this_day < max_auto_review_per_day
            and auto_review_this_week < max_auto_review_per_week
            and merge_request.author["id"] != user.id
            and self.user_has_already_been_assigned_to_this_mr(user, merge_request)
        )

    def all_possible_reviewers(self, merge_request):
        project = self.cnx.projects.get(merge_request.project_id)
        members_with_review_access = (
            member
            for member in project.members.all(all=True, as_list=False)
            if self.user_can_review(member, project, merge_request)
        )

        return members_with_review_access

    def a_possible_reviewer(self, merge_request):
        return choice(list(self.all_possible_reviewers(merge_request)))

    def assign_reviewer(self, merge_request, user):
        try:
            self.cnx.http_put(
                f"/projects/{merge_request.project_id}/merge_requests/{merge_request.iid}",
                query_data={"assignee_id": user.id},
            )
        except GitlabHttpError:
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            print(
                f"ERROR: no permission to assign a reviewer to {merge_request.title}"
                f" ({merge_request.web_url})"
            )
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            return

        self.review_states.loc[len(self.review_states)] = (
            user.username,
            datetime.now(),
            merge_request.web_url,
        )
        print(f"{user.name} has been assigned to {merge_request.title}")

    def all_reviews_to_do(self):
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        merge_requests = self.cnx.mergerequests.list(
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            labels=TO_REVIEW_LABEL,
            state="opened",
            wip="no",
            scope="all",
            assignee_id="None",
            all=True,
        )

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        merge_requests.extend(
            self.cnx.mergerequests.list(
                labels="None",
                state="opened",
                wip="no",
                scope="all",
                assignee_id="None",
                all=True,
            )
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        )

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        shuffle(merge_requests)

        for merge_request in merge_requests:
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            if merge_request.work_in_progress:
                # double check that the MR is not WIP.
                # it seems that filtering in the search parameters is not enough
                # XXX is it a bug ?
                continue

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            project = self.cnx.projects.get(merge_request.project_id)
            if CLIENT_PROJECT_TAG in project.tag_list:
                # it's a client project. Let's assume that someone will take
                # care of this MR.
                print(
                    f"INFO: {merge_request.web_url} would need review, but it's a client project"
                )
                continue
            yield merge_request

    def assign_reviews(self):
        for mr in self.all_reviews_to_do():
            try:
                reviewer = self.a_possible_reviewer(mr)
            except IndexError:
                print(f"WARNING: no reviewer available for {mr.title}.")
                continue
            self.assign_reviewer(mr, reviewer)


def main():
    parser = ArgumentParser()
    parser.add_argument("users_preferences_filepath")
    parser.add_argument("--gitlab-url", type=str, default=os.getenv("GITLAB_URL"))
    parser.add_argument("--gitlab-token", type=str, default=os.getenv("GITLAB_TOKEN"))
    args = parser.parse_args()

    assigner = ReviewAssigner(
        args.gitlab_url, args.gitlab_token, args.users_preferences_filepath
    )
    assigner.assign_reviews()
    assigner.save_review_states()


if __name__ == "__main__":
    main()