8c757f4dc9
Updating vim-plugins recently started timing out regularly for me. It may have to do with an ISP switch on my side, but I don't think that should cause timeouts. I guess I'm probably not the only one experiencing this, so in this comment I introduce exponential backoff. Every request will be retried up to 3 times (3 seconds, 6 seconds, 12 seconds delay).
437 lines
13 KiB
Python
Executable file
437 lines
13 KiB
Python
Executable file
#!/usr/bin/env nix-shell
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#!nix-shell -p nix-prefetch-git -p python3 nix -i python3
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# format:
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# $ nix run nixpkgs.python3Packages.black -c black update.py
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# type-check:
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# $ nix run nixpkgs.python3Packages.mypy -c mypy update.py
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# linted:
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# $ nix run nixpkgs.python3Packages.flake8 -c flake8 --ignore E501,E265 update.py
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import argparse
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import functools
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import json
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import os
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import subprocess
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import sys
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import traceback
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import urllib.error
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import urllib.request
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import xml.etree.ElementTree as ET
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from datetime import datetime
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from multiprocessing.dummy import Pool
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from pathlib import Path
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from typing import Dict, List, Optional, Tuple, Union, Any, Callable
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from urllib.parse import urljoin, urlparse
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from tempfile import NamedTemporaryFile
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ATOM_ENTRY = "{http://www.w3.org/2005/Atom}entry" # " vim gets confused here
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ATOM_LINK = "{http://www.w3.org/2005/Atom}link" # "
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ATOM_UPDATED = "{http://www.w3.org/2005/Atom}updated" # "
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ROOT = Path(__file__).parent
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DEFAULT_IN = ROOT.joinpath("vim-plugin-names")
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DEFAULT_OUT = ROOT.joinpath("generated.nix")
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import time
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from functools import wraps
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def retry(ExceptionToCheck: Any, tries: int = 4, delay: float = 3, backoff: float = 2):
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"""Retry calling the decorated function using an exponential backoff.
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http://www.saltycrane.com/blog/2009/11/trying-out-retry-decorator-python/
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original from: http://wiki.python.org/moin/PythonDecoratorLibrary#Retry
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(BSD licensed)
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:param ExceptionToCheck: the exception on which to retry
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:param tries: number of times to try (not retry) before giving up
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:param delay: initial delay between retries in seconds
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:param backoff: backoff multiplier e.g. value of 2 will double the delay
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each retry
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"""
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def deco_retry(f: Callable) -> Callable:
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@wraps(f)
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def f_retry(*args: Any, **kwargs: Any) -> Any:
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mtries, mdelay = tries, delay
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while mtries > 1:
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try:
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return f(*args, **kwargs)
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except ExceptionToCheck as e:
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print(f"{str(e)}, Retrying in {mdelay} seconds...")
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time.sleep(mdelay)
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mtries -= 1
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mdelay *= backoff
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return f(*args, **kwargs)
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return f_retry # true decorator
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return deco_retry
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class Repo:
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def __init__(self, owner: str, name: str) -> None:
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self.owner = owner
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self.name = name
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def url(self, path: str) -> str:
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return urljoin(f"https://github.com/{self.owner}/{self.name}/", path)
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def __repr__(self) -> str:
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return f"Repo({self.owner}, {self.name})"
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@retry(urllib.error.URLError, tries=4, delay=3, backoff=2)
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def has_submodules(self) -> bool:
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try:
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urllib.request.urlopen(
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self.url("blob/master/.gitmodules"), timeout=10
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).close()
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except urllib.error.HTTPError as e:
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if e.code == 404:
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return False
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else:
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raise
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return True
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@retry(urllib.error.URLError, tries=4, delay=3, backoff=2)
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def latest_commit(self) -> Tuple[str, datetime]:
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with urllib.request.urlopen(self.url("commits/master.atom"), timeout=10) as req:
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xml = req.read()
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root = ET.fromstring(xml)
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latest_entry = root.find(ATOM_ENTRY)
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assert latest_entry is not None, f"No commits found in repository {self}"
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commit_link = latest_entry.find(ATOM_LINK)
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assert commit_link is not None, f"No link tag found feed entry {xml}"
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url = urlparse(commit_link.get("href"))
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updated_tag = latest_entry.find(ATOM_UPDATED)
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assert (
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updated_tag is not None and updated_tag.text is not None
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), f"No updated tag found feed entry {xml}"
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updated = datetime.strptime(updated_tag.text, "%Y-%m-%dT%H:%M:%SZ")
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return Path(str(url.path)).name, updated
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def prefetch_git(self, ref: str) -> str:
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data = subprocess.check_output(
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["nix-prefetch-git", "--fetch-submodules", self.url(""), ref]
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)
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return json.loads(data)["sha256"]
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def prefetch_github(self, ref: str) -> str:
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data = subprocess.check_output(
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["nix-prefetch-url", "--unpack", self.url(f"archive/{ref}.tar.gz")]
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)
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return data.strip().decode("utf-8")
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class Plugin:
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def __init__(
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self,
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name: str,
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commit: str,
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has_submodules: bool,
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sha256: str,
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date: Optional[datetime] = None,
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) -> None:
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self.name = name
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self.commit = commit
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self.has_submodules = has_submodules
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self.sha256 = sha256
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self.date = date
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@property
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def normalized_name(self) -> str:
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return self.name.replace(".", "-")
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@property
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def version(self) -> str:
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assert self.date is not None
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return self.date.strftime("%Y-%m-%d")
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def as_json(self) -> Dict[str, str]:
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copy = self.__dict__.copy()
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del copy["date"]
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return copy
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GET_PLUGINS = f"""(with import <localpkgs> {{}};
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let
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inherit (vimUtils.override {{inherit vim;}}) buildVimPluginFrom2Nix;
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generated = callPackage {ROOT}/generated.nix {{
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inherit buildVimPluginFrom2Nix;
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}};
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hasChecksum = value: lib.isAttrs value && lib.hasAttrByPath ["src" "outputHash"] value;
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getChecksum = name: value:
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if hasChecksum value then {{
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submodules = value.src.fetchSubmodules or false;
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sha256 = value.src.outputHash;
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rev = value.src.rev;
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}} else null;
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checksums = lib.mapAttrs getChecksum generated;
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in lib.filterAttrs (n: v: v != null) checksums)"""
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class CleanEnvironment(object):
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def __enter__(self) -> None:
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self.old_environ = os.environ.copy()
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local_pkgs = str(ROOT.joinpath("../../.."))
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os.environ["NIX_PATH"] = f"localpkgs={local_pkgs}"
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self.empty_config = NamedTemporaryFile()
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self.empty_config.write(b"{}")
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self.empty_config.flush()
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os.environ["NIXPKGS_CONFIG"] = self.empty_config.name
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def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None:
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os.environ.update(self.old_environ)
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self.empty_config.close()
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def get_current_plugins() -> List[Plugin]:
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with CleanEnvironment():
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out = subprocess.check_output(["nix", "eval", "--json", GET_PLUGINS])
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data = json.loads(out)
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plugins = []
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for name, attr in data.items():
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p = Plugin(name, attr["rev"], attr["submodules"], attr["sha256"])
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plugins.append(p)
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return plugins
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def prefetch_plugin(user: str, repo_name: str, alias: str, cache: "Cache") -> Plugin:
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repo = Repo(user, repo_name)
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commit, date = repo.latest_commit()
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has_submodules = repo.has_submodules()
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cached_plugin = cache[commit]
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if cached_plugin is not None:
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cached_plugin.name = alias or repo_name
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cached_plugin.date = date
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return cached_plugin
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print(f"prefetch {user}/{repo_name}")
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if has_submodules:
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sha256 = repo.prefetch_git(commit)
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else:
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sha256 = repo.prefetch_github(commit)
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return Plugin(alias or repo_name, commit, has_submodules, sha256, date=date)
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def print_download_error(plugin: str, ex: Exception):
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print(f"{plugin}: {ex}", file=sys.stderr)
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ex_traceback = ex.__traceback__
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tb_lines = [
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line.rstrip("\n")
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for line in traceback.format_exception(ex.__class__, ex, ex_traceback)
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]
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print("\n".join(tb_lines))
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def check_results(
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results: List[Tuple[str, str, Union[Exception, Plugin]]]
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) -> List[Tuple[str, str, Plugin]]:
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failures: List[Tuple[str, Exception]] = []
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plugins = []
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for (owner, name, result) in results:
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if isinstance(result, Exception):
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failures.append((name, result))
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else:
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plugins.append((owner, name, result))
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print(f"{len(results) - len(failures)} plugins were checked", end="")
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if len(failures) == 0:
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print()
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return plugins
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else:
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print(f", {len(failures)} plugin(s) could not be downloaded:\n")
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for (plugin, exception) in failures:
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print_download_error(plugin, exception)
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sys.exit(1)
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def parse_plugin_line(line: str) -> Tuple[str, str, Optional[str]]:
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name, repo = line.split("/")
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try:
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repo, alias = repo.split(" as ")
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return (name, repo, alias.strip())
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except ValueError:
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# no alias defined
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return (name, repo.strip(), None)
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def load_plugin_spec(plugin_file: str) -> List[Tuple[str, str, Optional[str]]]:
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plugins = []
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with open(plugin_file) as f:
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for line in f:
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plugin = parse_plugin_line(line)
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if not plugin[0]:
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msg = f"Invalid repository {line}, must be in the format owner/repo[ as alias]"
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print(msg, file=sys.stderr)
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sys.exit(1)
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plugins.append(plugin)
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return plugins
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def get_cache_path() -> Optional[Path]:
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xdg_cache = os.environ.get("XDG_CACHE_HOME", None)
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if xdg_cache is None:
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home = os.environ.get("HOME", None)
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if home is None:
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return None
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xdg_cache = str(Path(home, ".cache"))
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return Path(xdg_cache, "vim-plugin-cache.json")
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class Cache:
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def __init__(self, initial_plugins: List[Plugin]) -> None:
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self.cache_file = get_cache_path()
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downloads = {}
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for plugin in initial_plugins:
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downloads[plugin.commit] = plugin
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downloads.update(self.load())
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self.downloads = downloads
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def load(self) -> Dict[str, Plugin]:
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if self.cache_file is None or not self.cache_file.exists():
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return {}
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downloads: Dict[str, Plugin] = {}
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with open(self.cache_file) as f:
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data = json.load(f)
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for attr in data.values():
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p = Plugin(
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attr["name"], attr["commit"], attr["has_submodules"], attr["sha256"]
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)
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downloads[attr["commit"]] = p
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return downloads
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def store(self) -> None:
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if self.cache_file is None:
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return
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os.makedirs(self.cache_file.parent, exist_ok=True)
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with open(self.cache_file, "w+") as f:
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data = {}
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for name, attr in self.downloads.items():
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data[name] = attr.as_json()
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json.dump(data, f, indent=4, sort_keys=True)
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def __getitem__(self, key: str) -> Optional[Plugin]:
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return self.downloads.get(key, None)
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def __setitem__(self, key: str, value: Plugin) -> None:
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self.downloads[key] = value
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def prefetch(
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args: Tuple[str, str, str], cache: Cache
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) -> Tuple[str, str, Union[Exception, Plugin]]:
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assert len(args) == 3
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owner, repo, alias = args
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try:
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plugin = prefetch_plugin(owner, repo, alias, cache)
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cache[plugin.commit] = plugin
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return (owner, repo, plugin)
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except Exception as e:
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return (owner, repo, e)
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header = (
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"# This file has been generated by ./pkgs/misc/vim-plugins/update.py. Do not edit!"
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)
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def generate_nix(plugins: List[Tuple[str, str, Plugin]], outfile: str):
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sorted_plugins = sorted(plugins, key=lambda v: v[2].name.lower())
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with open(outfile, "w+") as f:
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f.write(header)
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f.write(
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"""
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{ lib, buildVimPluginFrom2Nix, fetchFromGitHub, overrides ? (self: super: {}) }:
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let
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packages = ( self:
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{"""
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)
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for owner, repo, plugin in sorted_plugins:
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if plugin.has_submodules:
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submodule_attr = "\n fetchSubmodules = true;"
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else:
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submodule_attr = ""
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f.write(
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f"""
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{plugin.normalized_name} = buildVimPluginFrom2Nix {{
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pname = "{plugin.normalized_name}";
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version = "{plugin.version}";
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src = fetchFromGitHub {{
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owner = "{owner}";
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repo = "{repo}";
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rev = "{plugin.commit}";
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sha256 = "{plugin.sha256}";{submodule_attr}
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}};
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}};
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"""
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)
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f.write(
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"""
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});
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in lib.fix' (lib.extends overrides packages)
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"""
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)
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print(f"updated {outfile}")
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def parse_args():
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parser = argparse.ArgumentParser(
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description=(
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"Updates nix derivations for vim plugins"
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f"By default from {DEFAULT_IN} to {DEFAULT_OUT}"
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)
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)
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parser.add_argument(
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"--input-names",
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"-i",
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dest="input_file",
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default=DEFAULT_IN,
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help="A list of plugins in the form owner/repo",
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)
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parser.add_argument(
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"--out",
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"-o",
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dest="outfile",
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default=DEFAULT_OUT,
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help="Filename to save generated nix code",
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)
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return parser.parse_args()
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def main() -> None:
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args = parse_args()
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plugin_names = load_plugin_spec(args.input_file)
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current_plugins = get_current_plugins()
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cache = Cache(current_plugins)
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prefetch_with_cache = functools.partial(prefetch, cache=cache)
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try:
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# synchronous variant for debugging
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# results = list(map(prefetch_with_cache, plugin_names))
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pool = Pool(processes=30)
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results = pool.map(prefetch_with_cache, plugin_names)
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finally:
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cache.store()
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plugins = check_results(results)
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generate_nix(plugins, args.outfile)
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if __name__ == "__main__":
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main()
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