Improve caching

app/httpsig.py

@@ -8,22 +8,27 @@ import hashlib
 import typing
 from dataclasses import dataclass
 from datetime import datetime
-from functools import lru_cache
 from typing import Any
 from typing import Dict
 from typing import Optional
 
 import fastapi
 import httpx
+from cachetools import LFUCache
 from Crypto.Hash import SHA256
 from Crypto.Signature import PKCS1_v1_5
 from loguru import logger
+from sqlalchemy import select
 
 from app import activitypub as ap
 from app import config
+from app.database import AsyncSession
+from app.database import get_db_session
 from app.key import Key
 from app.key import get_key
 
+_KEY_CACHE = LFUCache(256)
+
 
 def _build_signed_string(
     signed_headers: str, method: str, path: str, headers: Any, body_digest: str | None
@@ -62,9 +67,25 @@ def _body_digest(body: bytes) -> str:
     return "SHA-256=" + base64.b64encode(h.digest()).decode("utf-8")
 
 
-@lru_cache(32)
-async def _get_public_key(key_id: str) -> Key:
-    # TODO: use DB to use cache actor
+async def _get_public_key(db_session: AsyncSession, key_id: str) -> Key:
+    if cached_key := _KEY_CACHE.get(key_id):
+        return cached_key
+
+    # Check if the key belongs to an actor already in DB
+    from app import models
+    existing_actor = (
+        await db_session.scalars(
+            select(models.Actor).where(models.Actor.ap_id == key_id.split("#")[0])
+        )
+    ).one_or_none()
+    if existing_actor and existing_actor.public_key_id == key_id:
+        k = Key(existing_actor.ap_id, key_id)
+        k.load_pub(existing_actor.public_key_as_pem)
+        logger.info(f"Found {key_id} on an existing actor")
+        _KEY_CACHE[key_id] = k
+        return k
+
+    # Fetch it
     from app import activitypub as ap
 
     actor = await ap.fetch(key_id)
@@ -82,6 +103,7 @@ async def _get_public_key(key_id: str) -> Key:
             f"failed to fetch requested key {key_id}: got {actor['publicKey']['id']}"
         )
 
+    _KEY_CACHE[key_id] = k
     return k
 
 
@@ -93,6 +115,7 @@ class HTTPSigInfo:
 
 async def httpsig_checker(
     request: fastapi.Request,
+    db_session: AsyncSession = fastapi.Depends(get_db_session),
 ) -> HTTPSigInfo:
     body = await request.body()
 
@@ -111,7 +134,7 @@ async def httpsig_checker(
     )
 
     try:
-        k = await _get_public_key(hsig["keyId"])
+        k = await _get_public_key(db_session, hsig["keyId"])
     except ap.ObjectIsGoneError:
         logger.info("Actor is gone")
         return HTTPSigInfo(has_valid_signature=False)

app/main.py

@@ -8,6 +8,7 @@ from typing import Any
 from typing import Type
 
 import httpx
+from cachetools import LFUCache
 from fastapi import Depends
 from fastapi import FastAPI
 from fastapi import Form
@@ -56,6 +57,9 @@ from app.utils import pagination
 from app.utils.emoji import EMOJIS_BY_NAME
 from app.webfinger import get_remote_follow_template
 
+_RESIZED_CACHE = LFUCache(32)
+
+
 # TODO(ts):
 #
 # Next:
@@ -728,7 +732,7 @@ async def serve_proxy_media(request: Request, encoded_url: str) -> StreamingResp
 
 
 @app.get("/proxy/media/{encoded_url}/{size}")
-def serve_proxy_media_resized(
+async def serve_proxy_media_resized(
     request: Request,
     encoded_url: str,
     size: int,
@@ -738,18 +742,38 @@ def serve_proxy_media_resized(
 
     # Decode the base64-encoded URL
     url = base64.urlsafe_b64decode(encoded_url).decode()
+
+    is_cached = False
+    is_resized = False
+    if cached_resp := _RESIZED_CACHE.get((url, size)):
+        is_resized, resized_content, resized_mimetype, resp_headers = cached_resp
+        if is_resized:
+            return PlainTextResponse(
+                resized_content,
+                media_type=resized_mimetype,
+                headers=resp_headers,
+            )
+        is_cached = True
+
     # Request the URL (and filter request headers)
-    proxy_resp = httpx.get(
-        url,
-        headers=[
-            (k, v)
-            for (k, v) in request.headers.raw
-            if k.lower()
-            not in [b"host", b"cookie", b"x-forwarded-for", b"x-real-ip", b"user-agent"]
-        ]
-        + [(b"user-agent", USER_AGENT.encode())],
-    )
-    if proxy_resp.status_code != 200:
+    async with httpx.AsyncClient() as client:
+        proxy_resp = await client.get(
+            url,
+            headers=[
+                (k, v)
+                for (k, v) in request.headers.raw
+                if k.lower()
+                not in [
+                    b"host",
+                    b"cookie",
+                    b"x-forwarded-for",
+                    b"x-real-ip",
+                    b"user-agent",
+                ]
+            ]
+            + [(b"user-agent", USER_AGENT.encode())],
+        )
+    if proxy_resp.status_code != 200 or (is_cached and not is_resized):
         return PlainTextResponse(
             proxy_resp.content,
             status_code=proxy_resp.status_code,
@@ -772,15 +796,23 @@ def serve_proxy_media_resized(
     try:
         out = BytesIO(proxy_resp.content)
         i = Image.open(out)
-        if i.is_animated:
+        if getattr(i, "is_animated", False):
             raise ValueError
         i.thumbnail((size, size))
         resized_buf = BytesIO()
         i.save(resized_buf, format=i.format)
         resized_buf.seek(0)
+        resized_content = resized_buf.read()
+        resized_mimetype = i.get_format_mimetype()  # type: ignore
+        _RESIZED_CACHE[(url, size)] = (
+            True,
+            resized_content,
+            resized_mimetype,
+            proxy_resp_headers,
+        )
         return PlainTextResponse(
-            resized_buf.read(),
-            media_type=i.get_format_mimetype(),  # type: ignore
+            resized_content,
+            media_type=resized_mimetype,
             headers=proxy_resp_headers,
         )
     except ValueError:

app/templates.py

@@ -190,7 +190,8 @@ def _clean_html(html: str, note: Object) -> str:
                     strip=True,
                 ),
                 note,
-            )
+            ),
+            is_local=note.ap_id.startswith(BASE_URL),
         )
     except Exception:
         raise
@@ -241,12 +242,15 @@ def _html2text(content: str) -> str:
     return H2T.handle(content)
 
 
-def _replace_emoji(u, data):
+def _replace_emoji(u: str, _) -> str:
     filename = hex(ord(u))[2:]
     return config.EMOJI_TPL.format(filename=filename, raw=u)
 
 
-def _emojify(text: str):
+def _emojify(text: str, is_local: bool) -> str:
+    if not is_local:
+        return text
+
     return emoji.replace_emoji(
         text,
         replace=_replace_emoji,

app/templates/admin_inbox.html

@@ -16,7 +16,10 @@
     </div>
     {{ utils.display_actor(inbox_object.actor, actors_metadata) }}
 {% else %}
+    <p>
     Implement {{ inbox_object.ap_type }}
+    {{ inbox_object.ap_object }}
+    </p>
 {% endif %}
 {% endfor %}