diff options
Diffstat (limited to '')
| -rw-r--r-- | bot/exts/info/doc.py | 37 | ||||
| -rw-r--r-- | bot/exts/utils/utils.py | 193 | ||||
| -rw-r--r-- | bot/utils/cache.py | 41 |
3 files changed, 167 insertions, 104 deletions
diff --git a/bot/exts/info/doc.py b/bot/exts/info/doc.py index c16a99225..7ec8caa4b 100644 --- a/bot/exts/info/doc.py +++ b/bot/exts/info/doc.py @@ -3,10 +3,9 @@ import functools import logging import re import textwrap -from collections import OrderedDict from contextlib import suppress from types import SimpleNamespace -from typing import Any, Callable, Optional, Tuple +from typing import Optional, Tuple import discord from bs4 import BeautifulSoup @@ -22,6 +21,7 @@ from bot.bot import Bot from bot.constants import MODERATION_ROLES, RedirectOutput from bot.converters import ValidPythonIdentifier, ValidURL from bot.pagination import LinePaginator +from bot.utils.cache import AsyncCache from bot.utils.messages import wait_for_deletion @@ -65,34 +65,7 @@ WHITESPACE_AFTER_NEWLINES_RE = re.compile(r"(?<=\n\n)(\s+)") FAILED_REQUEST_RETRY_AMOUNT = 3 NOT_FOUND_DELETE_DELAY = RedirectOutput.delete_delay - -def async_cache(max_size: int = 128, arg_offset: int = 0) -> Callable: - """ - LRU cache implementation for coroutines. - - Once the cache exceeds the maximum size, keys are deleted in FIFO order. - - An offset may be optionally provided to be applied to the coroutine's arguments when creating the cache key. - """ - # Assign the cache to the function itself so we can clear it from outside. - async_cache.cache = OrderedDict() - - def decorator(function: Callable) -> Callable: - """Define the async_cache decorator.""" - @functools.wraps(function) - async def wrapper(*args) -> Any: - """Decorator wrapper for the caching logic.""" - key = ':'.join(args[arg_offset:]) - - value = async_cache.cache.get(key) - if value is None: - if len(async_cache.cache) > max_size: - async_cache.cache.popitem(last=False) - - async_cache.cache[key] = await function(*args) - return async_cache.cache[key] - return wrapper - return decorator +symbol_cache = AsyncCache() class DocMarkdownConverter(MarkdownConverter): @@ -215,7 +188,7 @@ class Doc(commands.Cog): self.base_urls.clear() self.inventories.clear() self.renamed_symbols.clear() - async_cache.cache = OrderedDict() + symbol_cache.clear() # Run all coroutines concurrently - since each of them performs a HTTP # request, this speeds up fetching the inventory data heavily. @@ -280,7 +253,7 @@ class Doc(commands.Cog): return signatures, description.replace('ΒΆ', '') - @async_cache(arg_offset=1) + @symbol_cache(arg_offset=1) async def get_symbol_embed(self, symbol: str) -> Optional[discord.Embed]: """ Attempt to scrape and fetch the data for the given `symbol`, and build an embed from its contents. diff --git a/bot/exts/utils/utils.py b/bot/exts/utils/utils.py index 3e9230414..558d0cf72 100644 --- a/bot/exts/utils/utils.py +++ b/bot/exts/utils/utils.py @@ -2,9 +2,10 @@ import difflib import logging import re import unicodedata +from datetime import datetime, timedelta from email.parser import HeaderParser from io import StringIO -from typing import Tuple, Union +from typing import Dict, Optional, Tuple, Union from discord import Colour, Embed, utils from discord.ext.commands import BadArgument, Cog, Context, clean_content, command, has_any_role @@ -14,6 +15,7 @@ from bot.constants import Channels, MODERATION_ROLES, STAFF_ROLES from bot.decorators import in_whitelist from bot.pagination import LinePaginator from bot.utils import messages +from bot.utils.cache import AsyncCache log = logging.getLogger(__name__) @@ -41,80 +43,21 @@ Namespaces are one honking great idea -- let's do more of those! ICON_URL = "https://www.python.org/static/opengraph-icon-200x200.png" +pep_cache = AsyncCache() + class Utils(Cog): """A selection of utilities which don't have a clear category.""" + BASE_PEP_URL = "http://www.python.org/dev/peps/pep-" + BASE_GITHUB_PEP_URL = "https://raw.githubusercontent.com/python/peps/master/pep-" + PEPS_LISTING_API_URL = "https://api.github.com/repos/python/peps/contents?ref=master" + def __init__(self, bot: Bot): self.bot = bot - - self.base_pep_url = "http://www.python.org/dev/peps/pep-" - self.base_github_pep_url = "https://raw.githubusercontent.com/python/peps/master/pep-" - - @command(name='pep', aliases=('get_pep', 'p')) - async def pep_command(self, ctx: Context, pep_number: str) -> None: - """Fetches information about a PEP and sends it to the channel.""" - if pep_number.isdigit(): - pep_number = int(pep_number) - else: - await ctx.send_help(ctx.command) - return - - # Handle PEP 0 directly because it's not in .rst or .txt so it can't be accessed like other PEPs. - if pep_number == 0: - return await self.send_pep_zero(ctx) - - possible_extensions = ['.txt', '.rst'] - found_pep = False - for extension in possible_extensions: - # Attempt to fetch the PEP - pep_url = f"{self.base_github_pep_url}{pep_number:04}{extension}" - log.trace(f"Requesting PEP {pep_number} with {pep_url}") - response = await self.bot.http_session.get(pep_url) - - if response.status == 200: - log.trace("PEP found") - found_pep = True - - pep_content = await response.text() - - # Taken from https://github.com/python/peps/blob/master/pep0/pep.py#L179 - pep_header = HeaderParser().parse(StringIO(pep_content)) - - # Assemble the embed - pep_embed = Embed( - title=f"**PEP {pep_number} - {pep_header['Title']}**", - url=f"{self.base_pep_url}{pep_number:04}" - ) - - pep_embed.set_thumbnail(url=ICON_URL) - - # Add the interesting information - fields_to_check = ("Status", "Python-Version", "Created", "Type") - for field in fields_to_check: - # Check for a PEP metadata field that is present but has an empty value - # embed field values can't contain an empty string - if pep_header.get(field, ""): - pep_embed.add_field(name=field, value=pep_header[field]) - - elif response.status != 404: - # any response except 200 and 404 is expected - found_pep = True # actually not, but it's easier to display this way - log.trace(f"The user requested PEP {pep_number}, but the response had an unexpected status code: " - f"{response.status}.\n{response.text}") - - error_message = "Unexpected HTTP error during PEP search. Please let us know." - pep_embed = Embed(title="Unexpected error", description=error_message) - pep_embed.colour = Colour.red() - break - - if not found_pep: - log.trace("PEP was not found") - not_found = f"PEP {pep_number} does not exist." - pep_embed = Embed(title="PEP not found", description=not_found) - pep_embed.colour = Colour.red() - - await ctx.message.channel.send(embed=pep_embed) + self.peps: Dict[int, str] = {} + self.last_refreshed_peps: Optional[datetime] = None + self.bot.loop.create_task(self.refresh_peps_urls()) @command() @in_whitelist(channels=(Channels.bot_commands,), roles=STAFF_ROLES) @@ -246,8 +189,51 @@ class Utils(Cog): for reaction in options: await message.add_reaction(reaction) - async def send_pep_zero(self, ctx: Context) -> None: - """Send information about PEP 0.""" + # region: PEP + + async def refresh_peps_urls(self) -> None: + """Refresh PEP URLs listing in every 3 hours.""" + # Wait until HTTP client is available + await self.bot.wait_until_ready() + log.trace("Started refreshing PEP URLs.") + + async with self.bot.http_session.get(self.PEPS_LISTING_API_URL) as resp: + listing = await resp.json() + + log.trace("Got PEP URLs listing from GitHub API") + + for file in listing: + name = file["name"] + if name.startswith("pep-") and name.endswith((".rst", ".txt")): + pep_number = name.replace("pep-", "").split(".")[0] + self.peps[int(pep_number)] = file["download_url"] + + self.last_refreshed_peps = datetime.now() + log.info("Successfully refreshed PEP URLs listing.") + + @command(name='pep', aliases=('get_pep', 'p')) + async def pep_command(self, ctx: Context, pep_number: int) -> None: + """Fetches information about a PEP and sends it to the channel.""" + # Trigger typing in chat to show users that bot is responding + await ctx.trigger_typing() + + # Handle PEP 0 directly because it's not in .rst or .txt so it can't be accessed like other PEPs. + if pep_number == 0: + pep_embed = self.get_pep_zero_embed() + else: + if not await self.validate_pep_number(ctx, pep_number): + return + + pep_embed = await self.get_pep_embed(ctx, pep_number) + + if pep_embed: + await ctx.send(embed=pep_embed) + log.trace(f"PEP {pep_number} getting and sending finished successfully. Increasing stat.") + self.bot.stats.incr(f"pep_fetches.{pep_number}") + + @staticmethod + def get_pep_zero_embed() -> Embed: + """Get information embed about PEP 0.""" pep_embed = Embed( title="**PEP 0 - Index of Python Enhancement Proposals (PEPs)**", url="https://www.python.org/dev/peps/" @@ -257,7 +243,70 @@ class Utils(Cog): pep_embed.add_field(name="Created", value="13-Jul-2000") pep_embed.add_field(name="Type", value="Informational") - await ctx.send(embed=pep_embed) + return pep_embed + + async def validate_pep_number(self, ctx: Context, pep_nr: int) -> bool: + """Validate is PEP number valid. When it isn't, send error and return False. Otherwise return True.""" + if ( + pep_nr not in self.peps + and (self.last_refreshed_peps + timedelta(minutes=30)) <= datetime.now() + and len(str(pep_nr)) < 5 + ): + await self.refresh_peps_urls() + + if pep_nr not in self.peps: + log.trace(f"PEP {pep_nr} was not found") + not_found = f"PEP {pep_nr} does not exist." + await self.send_pep_error_embed(ctx, "PEP not found", not_found) + return False + + return True + + def generate_pep_embed(self, pep_header: Dict, pep_nr: int) -> Embed: + """Generate PEP embed based on PEP headers data.""" + # Assemble the embed + pep_embed = Embed( + title=f"**PEP {pep_nr} - {pep_header['Title']}**", + description=f"[Link]({self.BASE_PEP_URL}{pep_nr:04})", + ) + + pep_embed.set_thumbnail(url=ICON_URL) + + # Add the interesting information + fields_to_check = ("Status", "Python-Version", "Created", "Type") + for field in fields_to_check: + # Check for a PEP metadata field that is present but has an empty value + # embed field values can't contain an empty string + if pep_header.get(field, ""): + pep_embed.add_field(name=field, value=pep_header[field]) + + return pep_embed + + @pep_cache(arg_offset=2) + async def get_pep_embed(self, ctx: Context, pep_nr: int) -> Optional[Embed]: + """Fetch, generate and return PEP embed. When any error occur, use `self.send_pep_error_embed`.""" + response = await self.bot.http_session.get(self.peps[pep_nr]) + + if response.status == 200: + log.trace(f"PEP {pep_nr} found") + pep_content = await response.text() + + # Taken from https://github.com/python/peps/blob/master/pep0/pep.py#L179 + pep_header = HeaderParser().parse(StringIO(pep_content)) + return self.generate_pep_embed(pep_header, pep_nr) + else: + log.trace( + f"The user requested PEP {pep_nr}, but the response had an unexpected status code: {response.status}." + ) + error_message = "Unexpected HTTP error during PEP search. Please let us know." + return await self.send_pep_error_embed(ctx, "Unexpected error", error_message) + + @staticmethod + async def send_pep_error_embed(ctx: Context, title: str, description: str) -> None: + """Send error PEP embed with `ctx.send`.""" + embed = Embed(title=title, description=description, colour=Colour.red()) + await ctx.send(embed=embed) + # endregion def setup(bot: Bot) -> None: diff --git a/bot/utils/cache.py b/bot/utils/cache.py new file mode 100644 index 000000000..68ce15607 --- /dev/null +++ b/bot/utils/cache.py @@ -0,0 +1,41 @@ +import functools +from collections import OrderedDict +from typing import Any, Callable + + +class AsyncCache: + """ + LRU cache implementation for coroutines. + + Once the cache exceeds the maximum size, keys are deleted in FIFO order. + + An offset may be optionally provided to be applied to the coroutine's arguments when creating the cache key. + """ + + def __init__(self, max_size: int = 128): + self._cache = OrderedDict() + self._max_size = max_size + + def __call__(self, arg_offset: int = 0) -> Callable: + """Decorator for async cache.""" + + def decorator(function: Callable) -> Callable: + """Define the async cache decorator.""" + + @functools.wraps(function) + async def wrapper(*args) -> Any: + """Decorator wrapper for the caching logic.""" + key = args[arg_offset:] + + if key not in self._cache: + if len(self._cache) > self._max_size: + self._cache.popitem(last=False) + + self._cache[key] = await function(*args) + return self._cache[key] + return wrapper + return decorator + + def clear(self) -> None: + """Clear cache instance.""" + self._cache.clear() |