Reduce image size by approximately 65%

Eventually, we need to clear that on the backend, but for now we
deal with it in the frontend.

Bonus: this also optimises the display of the circle by removing
O(n) backend requests.

Dockerfile

@@ -3,44 +3,28 @@ FROM debian:buster
 ARG BUILD_SERIES=dev
 ARG BUILD_ID=0
 
-ENV DEBIAN_FRONTEND noninteractive
+COPY requirements.txt /opt/snikket-web-portal/requirements.txt
+COPY build-requirements.txt /opt/snikket-web-portal/build-requirements.txt
+COPY Makefile /opt/snikket-web-portal/Makefile
+COPY snikket_web/ /opt/snikket-web-portal/snikket_web
+COPY babel.cfg /opt/snikket-web-portal/babel.cfg
 
-# This Dockerfile attempts to strike a balance between image size and time it
-# takes to do an incremental build on changes.
-# Improvements welcome.
+WORKDIR /opt/snikket-web-portal
 
 RUN set -eu; \
+    export DEBIAN_FRONTEND=noninteractive ; \
     apt-get update ; \
     apt-get install -y --no-install-recommends \
         python3 python3-pip python3-setuptools python3-wheel \
         libpython3-dev \
         make build-essential \
         ; \
-    apt-get clean ; rm -rf /var/lib/apt/lists
-
-COPY requirements.txt /opt/snikket-web-portal/requirements.txt
-COPY build-requirements.txt /opt/snikket-web-portal/build-requirements.txt
-
-WORKDIR /opt/snikket-web-portal
-
-RUN set -eu; \
     pip3 install -r requirements.txt; \
     pip3 install -r build-requirements.txt; \
-    rm -rf /root/.cache;
-
-COPY Makefile /opt/snikket-web-portal/Makefile
-COPY snikket_web/ /opt/snikket-web-portal/snikket_web
-COPY babel.cfg /opt/snikket-web-portal/babel.cfg
-
-# NOTE: abusing true(1) as a terrible way to disable a specific command. If
-# one merged all the RUN commands into one, one would want to run the
-# uninstall/remove commands there, but with the split up RUN commands it is
-# rather pointless.
-RUN set -eu; \
     make; \
-    true pip3 uninstall -yr build-requirements.txt; \
-    true apt-get remove -y build-essential make libpython3-dev; \
-    true apt-get autoremove -y; \
+    pip3 uninstall -yr build-requirements.txt; \
+    apt-get remove -y build-essential make libpython3-dev; \
+    apt-get autoremove -y; \
     pip3 install hypercorn; \
     rm -rf /root/.cache; \
     apt-get clean ; rm -rf /var/lib/apt/lists

snikket_web/admin.py

@@ -1,4 +1,3 @@
-import asyncio
 import json
 import typing
 
@@ -362,25 +361,21 @@ async def edit_circle(id_: str) -> typing.Union[str, quart.Response]:
                 return redirect(url_for(".circles"))
             raise
 
-        circle_members = await asyncio.gather(*(
-            client.get_user_by_localpart(
-                localpart,
-                session=session,
-            )
-            for localpart in sorted(circle.members)
-        ))
-
-        users = await client.list_users()
+        users = sorted(
+            await client.list_users(),
+            key=lambda x: x.localpart
+        )
+        circle_members = [
+            user for user in users
+            if user.localpart in circle.members
+        ]
 
     form = EditCircleForm()
-    form.user_to_add.choices = sorted(
-        (
-            (u.localpart, u.localpart)
-            for u in users
-            if u.localpart not in circle.members
-        ),
-        key=lambda x: x[1]
-    )
+    form.user_to_add.choices = [
+        (user.localpart, user.localpart)
+        for user in users
+        if user.localpart not in circle.members
+    ]
     valid_users = [x[0] for x in form.user_to_add.choices]
 
     invite_form = InvitePost()