ClickHouse/tests/ci/report.py

# -*- coding: utf-8 -*-
import csv
import datetime
import json
import logging
import os
from ast import literal_eval
from dataclasses import asdict, dataclass
from html import escape
from pathlib import Path
from typing import (
    Dict,
    Final,
    Iterable,
    List,
    Literal,
    Optional,
    Sequence,
    Tuple,
    Union,
)

from build_download_helper import get_gh_api
from ci_config import CI_CONFIG, BuildConfig
from env_helper import REPORT_PATH, TEMP_PATH
from ci_utils import normalize_string

logger = logging.getLogger(__name__)

ERROR: Final = "error"
FAILURE: Final = "failure"
PENDING: Final = "pending"
SUCCESS: Final = "success"

OK: Final = "OK"
FAIL: Final = "FAIL"
SKIPPED: Final = "SKIPPED"

StatusType = Literal["error", "failure", "pending", "success"]
STATUSES = [ERROR, FAILURE, PENDING, SUCCESS]  # type: List[StatusType]


# The order of statuses from the worst to the best
def _state_rank(status: str) -> int:
    "return the index of status or index of SUCCESS in case of wrong status"
    try:
        return STATUSES.index(status)  # type: ignore
    except ValueError:
        return 3


def get_worst_status(statuses: Iterable[str]) -> StatusType:
    worst_status = SUCCESS  # type: StatusType
    for status in statuses:
        ind = _state_rank(status)
        if ind < _state_rank(worst_status):
            worst_status = STATUSES[ind]

        if worst_status == ERROR:
            break

    return worst_status


### BEST FRONTEND PRACTICES BELOW

HEAD_HTML_TEMPLATE = """
<!DOCTYPE html>
<html>
<head>
  <style>

:root {{
    --color: white;
    --background: hsl(190deg, 90%, 5%) linear-gradient(180deg, hsl(190deg, 90%, 10%), hsl(190deg, 90%, 0%));
    --td-background: hsl(190deg, 90%, 15%);
    --th-background: hsl(180deg, 90%, 15%);
    --link-color: #FF5;
    --link-hover-color: #F40;
    --menu-background: hsl(190deg, 90%, 20%);
    --menu-hover-background: hsl(190deg, 100%, 50%);
    --menu-hover-color: black;
    --text-gradient: linear-gradient(90deg, #8F8, #F88);
    --shadow-intensity: 1;
    --tr-hover-filter: brightness(120%);
    --table-border-color: black;
}}

[data-theme="light"] {{
    --color: black;
    --background: hsl(190deg, 90%, 90%) linear-gradient(180deg, #EEE, #DEE);
    --td-background: white;
    --th-background: #EEE;
    --link-color: #08F;
    --link-hover-color: #F40;
    --menu-background: white;
    --menu-hover-background: white;
    --menu-hover-color: #F40;
    --text-gradient: linear-gradient(90deg, black, black);
    --shadow-intensity: 0.1;
    --tr-hover-filter: brightness(95%);
    --table-border-color: #DDD;
}}

.gradient {{
    background-image: var(--text-gradient);
    background-size: 100%;
    background-repeat: repeat;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    -moz-text-fill-color: transparent;
    -webkit-background-clip: text;
    -moz-background-clip: text;
}}
html {{ min-height: 100%; font-family: "DejaVu Sans", "Noto Sans", Arial, sans-serif; background: var(--background); color: var(--color); }}
h1 {{ margin-left: 10px; }}
th, td {{ padding: 5px 10px 5px 10px; text-align: left; vertical-align: top; line-height: 1.5; border: 1px solid var(--table-border-color); }}
td {{ background: var(--td-background); }}
th {{ background: var(--th-background); }}
a {{ color: var(--link-color); text-decoration: none; }}
a:hover, a:active {{ color: var(--link-hover-color); text-decoration: none; }}
table {{ box-shadow: 0 8px 25px -5px rgba(0, 0, 0, var(--shadow-intensity)); border-collapse: collapse; border-spacing: 0; }}
p.links a {{ padding: 5px; margin: 3px; background: var(--menu-background); line-height: 2.5; white-space: nowrap; box-shadow: 0 8px 25px -5px rgba(0, 0, 0, var(--shadow-intensity)); }}
p.links a:hover {{ background: var(--menu-hover-background); color: var(--menu-hover-color); }}
th {{ cursor: pointer; }}
tr:hover {{ filter: var(--tr-hover-filter); }}
.expandable {{ cursor: pointer; }}
.expandable-content {{ display: none; }}
#fish {{ display: none; float: right; position: relative; top: -20em; right: 2vw; margin-bottom: -20em; width: 30vw; filter: brightness(7%); z-index: -1; }}

.themes {{
    float: right;
    font-size: 20pt;
    margin-bottom: 1rem;
}}

#toggle-dark, #toggle-light {{
    padding-right: 0.5rem;
    user-select: none;
    cursor: pointer;
}}

#toggle-dark:hover, #toggle-light:hover {{
    display: inline-block;
    transform: translate(1px, 1px);
    filter: brightness(125%);
}}

  </style>
  <title>{title}</title>
</head>
<body>
<div class="main">
<span class="nowrap themes"><span id="toggle-dark">🌚</span><span id="toggle-light">🌞</span></span>
<h1><span class="gradient">{header}</span></h1>
"""

FOOTER_HTML_TEMPLATE = """<img id="fish" src="https://presentations.clickhouse.com/images/fish.png" />
<script type="text/javascript">
    /// Straight from https://stackoverflow.com/questions/14267781/sorting-html-table-with-javascript

    const getCellValue = (tr, idx) => {{
        var classes = tr.classList;
        var elem = tr;
        if (classes.contains("expandable-content") || classes.contains("expandable-content.open"))
            elem = tr.previousElementSibling;
        return elem.children[idx].innerText || elem.children[idx].textContent;
    }}

    const comparer = (idx, asc) => (a, b) => ((v1, v2) =>
        v1 !== '' && v2 !== '' && !isNaN(v1) && !isNaN(v2) ? v1 - v2 : v1.toString().localeCompare(v2)
        )(getCellValue(asc ? a : b, idx), getCellValue(asc ? b : a, idx));

    document.querySelectorAll('th').forEach(th => th.addEventListener('click', (() => {{
        const table = th.closest('table');
        Array.from(table.querySelectorAll('tr:nth-child(n+2)'))
            .sort(comparer(Array.from(th.parentNode.children).indexOf(th), this.asc = !this.asc))
            .forEach(tr => table.appendChild(tr) );
    }})));

    Array.from(document.getElementsByClassName("expandable")).forEach(tr => tr.addEventListener('click', function() {{
        var content = this.nextElementSibling;
        content.classList.toggle("expandable-content");
    }}));

    let theme = 'dark';

    function setTheme(new_theme) {{
        theme = new_theme;
        document.documentElement.setAttribute('data-theme', theme);
        window.localStorage.setItem('theme', theme);
        drawFish();
    }}

    function drawFish() {{
        document.getElementById('fish').style.display = (document.body.clientHeight > 3000 && theme == 'dark') ? 'block' : 'none';
    }}

    document.getElementById('toggle-light').addEventListener('click', e => setTheme('light'));
    document.getElementById('toggle-dark').addEventListener('click', e => setTheme('dark'));

    let new_theme = window.localStorage.getItem('theme');
    if (new_theme && new_theme != theme) {{
        setTheme(new_theme);
    }}

    drawFish();
</script>
</body>
</html>
"""


HTML_BASE_TEST_TEMPLATE = (
    f"{HEAD_HTML_TEMPLATE}"
    """<p class="links">
<a href="{raw_log_url}">{raw_log_name}</a>
<a href="{commit_url}">Commit</a>
{additional_urls}
<a href="{task_url}">Task (github actions)</a>
<a href="{job_url}">Job (github actions)</a>
</p>
{test_part}
"""
    f"{FOOTER_HTML_TEMPLATE}"
)

HTML_TEST_PART = """
<table>
<tr>
{headers}
</tr>
{rows}
</table>
"""

BASE_HEADERS = ["Test name", "Test status"]
JOB_REPORT_FILE = Path(TEMP_PATH) / "job_report.json"


@dataclass
class TestResult:
    name: str
    status: str
    # the following fields are optional
    time: Optional[float] = None
    log_files: Optional[Union[Sequence[str], Sequence[Path]]] = None
    raw_logs: Optional[str] = None
    # the field for uploaded logs URLs
    log_urls: Optional[Sequence[str]] = None

    def set_raw_logs(self, raw_logs: str) -> None:
        self.raw_logs = raw_logs

    def set_log_files(self, log_files_literal: str) -> None:
        self.log_files = []  # type: Optional[List[Path]]
        log_paths = literal_eval(log_files_literal)
        if not isinstance(log_paths, list):
            raise ValueError(
                f"Malformed input: must be a list literal: {log_files_literal}"
            )
        for log_path in log_paths:
            assert Path(log_path).exists(), log_path
            self.log_files.append(log_path)

    @staticmethod
    def create_check_timeout_expired(timeout: float) -> "TestResult":
        return TestResult("Check timeout expired", "FAIL", timeout)


TestResults = List[TestResult]


@dataclass
class JobReport:
    status: str
    description: str
    test_results: TestResults
    start_time: str
    duration: float
    additional_files: Union[Sequence[str], Sequence[Path]]
    # clcikhouse version, build job only
    version: str = ""
    # checkname to set in commit status, set if differs from jjob name
    check_name: str = ""
    # directory with artifacts to upload on s3
    build_dir_for_upload: Union[Path, str] = ""
    # if False no GH commit status will be created by CI
    need_commit_status: bool = True

    @classmethod
    def exist(cls) -> bool:
        return JOB_REPORT_FILE.is_file()

    @classmethod
    def load(cls, from_file=None):  # type: ignore
        res = {}
        from_file = from_file or JOB_REPORT_FILE
        with open(from_file, "r") as json_file:
            res = json.load(json_file)
            # Deserialize the nested lists of TestResult
            test_results_data = res.get("test_results", [])
            test_results = [TestResult(**result) for result in test_results_data]
            del res["test_results"]
        return JobReport(test_results=test_results, **res)

    @classmethod
    def cleanup(cls):
        if JOB_REPORT_FILE.exists():
            JOB_REPORT_FILE.unlink()

    def dump(self, to_file=None):
        def path_converter(obj):
            if isinstance(obj, Path):
                return str(obj)
            raise TypeError("Type not serializable")

        to_file = to_file or JOB_REPORT_FILE
        with open(to_file, "w") as json_file:
            json.dump(asdict(self), json_file, default=path_converter, indent=2)


def read_test_results(results_path: Path, with_raw_logs: bool = True) -> TestResults:
    results = []  # type: TestResults
    with open(results_path, "r", encoding="utf-8") as descriptor:
        reader = csv.reader(descriptor, delimiter="\t")
        for line in reader:
            name = line[0]
            status = line[1]
            time = None
            if len(line) >= 3 and line[2] and line[2] != "\\N":
                # The value can be emtpy, but when it's not,
                # it's the time spent on the test
                try:
                    time = float(line[2])
                except ValueError:
                    pass

            result = TestResult(name, status, time)
            if len(line) == 4 and line[3]:
                # The value can be emtpy, but when it's not,
                # the 4th value is a pythonic list, e.g. ['file1', 'file2']
                if with_raw_logs:
                    # Python does not support TSV, so we unescape manually
                    result.set_raw_logs(
                        line[3].replace("\\t", "\t").replace("\\n", "\n")
                    )
                else:
                    result.set_log_files(line[3])

            results.append(result)

    return results


@dataclass
class BuildResult:
    build_name: str
    log_url: str
    build_urls: List[str]
    version: str
    status: str
    elapsed_seconds: int
    job_api_url: str
    pr_number: int = 0
    head_ref: str = "dummy_branch_name"
    _job_name: Optional[str] = None
    _job_html_url: Optional[str] = None
    _job_html_link: Optional[str] = None
    _grouped_urls: Optional[List[List[str]]] = None

    @classmethod
    def cleanup(cls):
        if Path(REPORT_PATH).exists():
            for file in Path(REPORT_PATH).iterdir():
                if "build_report" in file.name and file.name.endswith(".json"):
                    file.unlink()

    @classmethod
    def load(cls, build_name: str, pr_number: int, head_ref: str):  # type: ignore
        """
        loads report from a report file matched with given @pr_number and/or a @head_ref
        """
        report_path = Path(REPORT_PATH) / BuildResult.get_report_name(
            build_name, pr_number or head_ref
        )
        return cls.load_from_file(report_path)

    @classmethod
    def load_any(cls, build_name: str, pr_number: int, head_ref: str):  # type: ignore
        """
        loads report from suitable report file with the following priority:
            1. report from PR with the same @pr_number
            2. report from branch with the same @head_ref
            3. report from the master
            4. any other report
        """
        reports = []
        for file in Path(REPORT_PATH).iterdir():
            if f"{build_name}.json" in file.name:
                reports.append(file)
        if not reports:
            return None
        file_path = None
        for file in reports:
            if pr_number and f"_{pr_number}_" in file.name:
                file_path = file
                break
            if f"_{head_ref}_" in file.name:
                file_path = file
                break
            if "_master_" in file.name:
                file_path = file
                break
        return cls.load_from_file(file_path or reports[-1])

    @classmethod
    def load_from_file(cls, file: Union[Path, str]):  # type: ignore
        if not Path(file).exists():
            return None
        with open(file, "r") as json_file:
            res = json.load(json_file)
        return BuildResult(**res)

    def as_json(self) -> str:
        return json.dumps(asdict(self), indent=2)

    @property
    def build_config(self) -> Optional[BuildConfig]:
        return CI_CONFIG.build_config.get(self.build_name, None)

    @property
    def comment(self) -> str:
        if self.build_config is None:
            return self._wrong_config_message
        return self.build_config.comment

    @property
    def compiler(self) -> str:
        if self.build_config is None:
            return self._wrong_config_message
        return self.build_config.compiler

    @property
    def debug_build(self) -> bool:
        if self.build_config is None:
            return False
        return self.build_config.debug_build

    @property
    def sanitizer(self) -> str:
        if self.build_config is None:
            return self._wrong_config_message
        return self.build_config.sanitizer

    @property
    def coverage(self) -> str:
        if self.build_config is None:
            return self._wrong_config_message
        return str(self.build_config.coverage)

    @property
    def grouped_urls(self) -> List[List[str]]:
        "Combine and preserve build_urls by artifact types"
        if self._grouped_urls is not None:
            return self._grouped_urls
        if not self.build_urls:
            self._grouped_urls = [[]]
            return self._grouped_urls
        artifacts_groups = {
            "apk": [],
            "deb": [],
            "binary": [],
            "tgz": [],
            "rpm": [],
            "performance": [],
        }  # type: Dict[str, List[str]]
        for url in self.build_urls:
            if url.endswith("performance.tar.zst"):
                artifacts_groups["performance"].append(url)
            elif (
                url.endswith(".deb")
                or url.endswith(".buildinfo")
                or url.endswith(".changes")
                or url.endswith(".tar.gz")
            ):
                artifacts_groups["deb"].append(url)
            elif url.endswith(".apk"):
                artifacts_groups["apk"].append(url)
            elif url.endswith(".rpm"):
                artifacts_groups["rpm"].append(url)
            elif url.endswith(".tgz") or url.endswith(".tgz.sha512"):
                artifacts_groups["tgz"].append(url)
            else:
                artifacts_groups["binary"].append(url)
        self._grouped_urls = [urls for urls in artifacts_groups.values() if urls]
        return self._grouped_urls

    @property
    def _wrong_config_message(self) -> str:
        return "missing"

    @property
    def is_missing(self) -> bool:
        "The report is created for missing json file"
        return not (
            self.log_url
            or self.build_urls
            or self.version != "missing"
            or self.status != ERROR
        )

    @property
    def job_link(self) -> str:
        if self._job_html_link is not None:
            return self._job_html_link
        self._job_html_link = f'<a href="{self.job_html_url}">{self.job_name}</a>'
        return self._job_html_link

    @property
    def job_html_url(self) -> str:
        if self._job_html_url is not None:
            return self._job_html_url
        self._set_properties()
        return self._job_html_url or ""

    @property
    def job_name(self) -> str:
        if self._job_name is not None:
            return self._job_name
        self._set_properties()
        return self._job_name or ""

    @job_name.setter
    def job_name(self, job_name: str) -> None:
        self._job_name = job_name

    def _set_properties(self) -> None:
        if all(p is not None for p in (self._job_name, self._job_html_url)):
            return
        job_data = {}
        # quick check @self.job_api_url is valid url before request. it's set to "missing" for dummy BuildResult
        if "http" in self.job_api_url:
            try:
                job_data = get_gh_api(self.job_api_url).json()
            except Exception:
                pass
        # job_name can be set manually
        self._job_name = self._job_name or job_data.get("name", "unknown")
        self._job_html_url = job_data.get("html_url", "")

    @staticmethod
    def get_report_name(name: str, suffix: Union[str, int]) -> Path:
        assert "/" not in str(suffix)
        return Path(f"build_report_{suffix}_{name}.json")

    @staticmethod
    def missing_result(build_name: str) -> "BuildResult":
        return BuildResult(build_name, "", [], "missing", ERROR, 0, "missing")

    def write_json(self, directory: Union[Path, str] = REPORT_PATH) -> Path:
        path = Path(directory) / self.get_report_name(
            self.build_name, self.pr_number or normalize_string(self.head_ref)
        )
        path.write_text(
            json.dumps(
                {
                    "build_name": self.build_name,
                    "log_url": self.log_url,
                    "build_urls": self.build_urls,
                    "version": self.version,
                    "status": self.status,
                    "elapsed_seconds": self.elapsed_seconds,
                    "job_api_url": self.job_api_url,
                    "pr_number": self.pr_number,
                    "head_ref": self.head_ref,
                }
            ),
            encoding="utf-8",
        )
        # TODO: remove after the artifacts are in S3 completely
        env_path = Path(os.getenv("GITHUB_ENV", "/dev/null"))
        with env_path.open("a", encoding="utf-8") as ef:
            ef.write(f"BUILD_URLS={path.stem}")

        return path


BuildResults = List[BuildResult]


class ReportColorTheme:
    class ReportColor:
        yellow = "#FFB400"
        red = "#F00"
        green = "#0A0"
        blue = "#00B4FF"

    default = (ReportColor.green, ReportColor.red, ReportColor.yellow)


ColorTheme = Tuple[str, str, str]


def _format_header(
    header: str, branch_name: str, branch_url: Optional[str] = None
) -> str:
    # Following line does not lower CI->Ci and SQLancer->Sqlancer. It only
    # capitalizes the first letter and doesn't touch the rest of the word
    result = " ".join([w[0].upper() + w[1:] for w in header.split(" ") if w])
    result = result.replace("Clickhouse", "ClickHouse")
    result = result.replace("clickhouse", "ClickHouse")
    if "ClickHouse" not in result:
        result = f"ClickHouse {result}"
    if branch_url:
        result = f'{result} for <a href="{branch_url}">{branch_name}</a>'
    else:
        result = f"{result} for {branch_name}"
    return result


def _get_status_style(status: str, colortheme: Optional[ColorTheme] = None) -> str:
    ok_statuses = (OK, SUCCESS, "PASSED")
    fail_statuses = (FAIL, FAILURE, ERROR, "FAILED", "Timeout", "NOT_FAILED")

    if colortheme is None:
        colortheme = ReportColorTheme.default

    style = "font-weight: bold;"
    if status in ok_statuses:
        style += f"color: {colortheme[0]};"
    elif status in fail_statuses:
        style += f"color: {colortheme[1]};"
    else:
        style += f"color: {colortheme[2]};"
    return style


def _get_html_url_name(url):
    base_name = ""
    if isinstance(url, str):
        base_name = os.path.basename(url)
    if isinstance(url, tuple):
        base_name = url[1]

    if "?" in base_name:
        base_name = base_name.split("?")[0]

    if base_name is not None:
        return base_name.replace("%2B", "+").replace("%20", " ")
    return None


def _get_html_url(url):
    href = None
    name = None
    if isinstance(url, str):
        href, name = url, _get_html_url_name(url)
    if isinstance(url, tuple):
        href, name = url[0], _get_html_url_name(url)
    if href and name:
        return f'<a href="{href}">{_get_html_url_name(url)}</a>'
    return ""


def create_test_html_report(
    header: str,
    test_results: TestResults,
    raw_log_url: str,
    task_url: str,
    job_url: str,
    branch_url: str,
    branch_name: str,
    commit_url: str,
    additional_urls: Optional[List[str]] = None,
    statuscolors: Optional[ColorTheme] = None,
) -> str:
    if additional_urls is None:
        additional_urls = []

    if test_results:
        rows_part = []
        num_fails = 0
        has_test_time = False
        has_log_urls = False

        # Display entires with logs at the top (they correspond to failed tests)
        test_results.sort(
            key=lambda result: result.raw_logs is None and result.log_files is None
        )

        for test_result in test_results:
            colspan = 0
            if test_result.log_files is not None:
                has_log_urls = True

            row = []
            if test_result.raw_logs is not None:
                row.append('<tr class="expandable">')
            else:
                row.append("<tr>")
            row.append(f"<td>{test_result.name}</td>")
            colspan += 1
            style = _get_status_style(test_result.status, colortheme=statuscolors)

            # Allow to quickly scroll to the first failure.
            fail_id = ""
            has_error = test_result.status in ("FAIL", "NOT_FAILED")
            if has_error:
                num_fails = num_fails + 1
                fail_id = f'id="fail{num_fails}" '

            row.append(f'<td {fail_id}style="{style}">{test_result.status}</td>')
            colspan += 1

            if test_result.time is not None:
                has_test_time = True
                row.append(f"<td>{test_result.time}</td>")
                colspan += 1

            if test_result.log_urls is not None:
                has_log_urls = True
                test_logs_html = "<br>".join(
                    [_get_html_url(url) for url in test_result.log_urls]
                )
                row.append(f"<td>{test_logs_html}</td>")
                colspan += 1

            row.append("</tr>")
            rows_part.append("\n".join(row))
            if test_result.raw_logs is not None:
                raw_logs = escape(test_result.raw_logs)
                row_raw_logs = (
                    '<tr class="expandable-content">'
                    f'<td colspan="{colspan}"><pre>{raw_logs}</pre></td>'
                    "</tr>"
                )
                rows_part.append(row_raw_logs)

        headers = BASE_HEADERS.copy()
        if has_test_time:
            headers.append("Test time, sec.")
        if has_log_urls:
            headers.append("Logs")

        headers_html = "".join(["<th>" + h + "</th>" for h in headers])
        test_part = HTML_TEST_PART.format(headers=headers_html, rows="".join(rows_part))
    else:
        test_part = ""

    additional_html_urls = " ".join(
        [_get_html_url(url) for url in sorted(additional_urls, key=_get_html_url_name)]
    )

    raw_log_name = os.path.basename(raw_log_url)
    if "?" in raw_log_name:
        raw_log_name = raw_log_name.split("?")[0]

    html = HTML_BASE_TEST_TEMPLATE.format(
        title=_format_header(header, branch_name),
        header=_format_header(header, branch_name, branch_url),
        raw_log_name=raw_log_name,
        raw_log_url=raw_log_url,
        task_url=task_url,
        job_url=job_url,
        test_part=test_part,
        branch_name=branch_name,
        commit_url=commit_url,
        additional_urls=additional_html_urls,
    )
    return html


HTML_BASE_BUILD_TEMPLATE = (
    f"{HEAD_HTML_TEMPLATE}"
    """<p class="links">
<a href="{commit_url}">Commit</a>
<a href="{task_url}">Task (github actions)</a>
</p>
<table>
<tr>
<th>Config/job name</th>
<th>Compiler</th>
<th>Build type</th>
<th>Version</th>
<th>Sanitizer</th>
<th>Coverage</th>
<th>Status</th>
<th>Build log</th>
<th>Build time</th>
<th class="artifacts">Artifacts</th>
<th>Comment</th>
</tr>
{rows}
</table>
"""
    f"{FOOTER_HTML_TEMPLATE}"
)

LINK_TEMPLATE = '<a href="{url}">{text}</a>'


def create_build_html_report(
    header: str,
    build_results: BuildResults,
    task_url: str,
    branch_url: str,
    branch_name: str,
    commit_url: str,
) -> str:
    rows = []
    for build_result in build_results:
        for artifact_urls in build_result.grouped_urls:
            row = ["<tr>"]
            row.append(
                f"<td>{build_result.build_name}<br/>{build_result.job_link}</td>"
            )
            row.append(f"<td>{build_result.compiler}</td>")
            if build_result.debug_build:
                row.append("<td>debug</td>")
            else:
                row.append("<td>relwithdebuginfo</td>")
            row.append(f"<td>{build_result.version}</td>")
            if build_result.sanitizer:
                row.append(f"<td>{build_result.sanitizer}</td>")
            else:
                row.append("<td>none</td>")

            row.append(f"<td>{build_result.coverage}</td>")

            if build_result.status:
                style = _get_status_style(build_result.status)
                row.append(f'<td style="{style}">{build_result.status}</td>')
            else:
                style = _get_status_style(ERROR)
                row.append(f'<td style="{style}">error</td>')

            row.append(f'<td><a href="{build_result.log_url}">link</a></td>')

            delta = "unknown"
            if build_result.elapsed_seconds:
                delta = str(datetime.timedelta(seconds=build_result.elapsed_seconds))

            row.append(f"<td>{delta}</td>")

            links = []
            link_separator = "<br/>"
            if artifact_urls:
                for artifact_url in artifact_urls:
                    links.append(
                        LINK_TEMPLATE.format(
                            text=_get_html_url_name(artifact_url), url=artifact_url
                        )
                    )
            row.append(f"<td>{link_separator.join(links)}</td>")

            comment = build_result.comment
            if (
                build_result.build_config is not None
                and build_result.build_config.sparse_checkout
            ):
                comment += " (note: sparse checkout is used, see update-submodules.sh)"
            row.append(f"<td>{comment}</td>")

            row.append("</tr>")
            rows.append("".join(row))
    return HTML_BASE_BUILD_TEMPLATE.format(
        title=_format_header(header, branch_name),
        header=_format_header(header, branch_name, branch_url),
        rows="".join(rows),
        task_url=task_url,
        branch_name=branch_name,
        commit_url=commit_url,
    )