chore: Create in-depth Docker dev environment w/ Scylla

Author: atlas-oc

.gitignore

@@ -25,7 +25,7 @@ erl_crash.dump
 # Docker volumes
 /pgdata
 /msg_pgdata
-/scylla_data
+/dev/scylla/data
 
 # Ignore package tarball (built via "mix hex.build").
 octocon-*.tar

config/dev-template.exs

@@ -1,15 +1,5 @@
 import Config
 
-config :octocon, Octocon.MessageRepo,
-  username: "postgres",
-  password: "postgres",
-  hostname: "localhost",
-  database: "octocon_dev",
-  port: "4002",
-  stacktrace: true,
-  show_sensitive_data_on_connection_error: true,
-  pool_size: 10
-
 config :octocon, :primary_node_count, 1
 
 # Discord channel scope
@@ -69,10 +59,31 @@ config :phoenix, :stacktrace_depth, 20
 # Initialize plugs at runtime for faster development compilation
 config :phoenix, :plug_init_mode, :runtime
 
+config :octocon, Octocon.Repo,
+  nodes: ["scylla-nam"],
+  load_balancing:
+    {Xandra.Cluster.LoadBalancingPolicy.DCAwareRoundRobin,
+      [local_data_center: "nam"]},
+    refresh_topology_interval: :timer.minutes(1),
+    sync_connect: :infinity,
+    pool_size: 10
+
+config :octocon, Octocon.MessageRepo,
+  username: "postgres",
+  password: "postgres",
+  hostname: "msg-db",
+  database: "octocon_dev",
+  port: "5432",
+  stacktrace: true,
+  show_sensitive_data_on_connection_error: true,
+  pool_size: 10
+
 # Discord token
 config :nostrum,
   token: "TODO"
 
+config :octocon, :current_db_region, "nam"
+
 # Discord auth
 config :ueberauth, Ueberauth.Strategy.Discord.OAuth,
   client_id: "TODO",
@@ -86,7 +97,9 @@ config :ueberauth, Ueberauth.Strategy.Google.OAuth,
 # Guardian
 config :octocon, Octocon.Auth.Guardian,
   issuer: "octocon",
-  secret_key: "TODO"
+  secret_key: "Vui-nVt36x8I-8EWN8Fg5xvv588aniMu5eubeD7ZTdwIBdwt4qHDVXyL-2NjAeE1"
+
+config :octocon, :pepper, "6dtfTrHA"
 
 config :waffle,
   storage: Waffle.Storage.S3,

dev/Dockerfile

@@ -0,0 +1,49 @@
+ARG ELIXIR_VERSION=1.19.5
+ARG OTP_VERSION=27.0
+ARG DEBIAN_VERSION=trixie-20260112-slim
+
+FROM "hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
+
+ENV MIX_BUILD_ROOT=/build
+ENV MIX_DEPS_PATH=/deps
+ENV HOME=/home/user
+
+RUN mkdir /build && \
+  chown nobody /build && \
+  mkdir /deps && \
+  chown nobody /deps && \
+  mkdir /docker && \
+  chown nobody /docker && \
+  mkdir /home/user && \
+  chown nobody /home/user 
+
+ADD dev/docker /docker
+
+RUN chmod +x /docker/entrypoint.sh /docker/command.sh && \
+  chown nobody /docker/entrypoint.sh /docker/command.sh
+
+RUN apt-get update -y && apt-get install -y build-essential git libstdc++6 openssl libncurses6 locales ca-certificates curl gnupg iproute2 iputils-ping jq \
+  && apt-get clean && rm -f /var/lib/apt/lists/*_*
+
+# Set the locale
+RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
+
+USER nobody
+
+# install hex + rebar
+RUN mix local.hex --force && \
+  mix local.rebar --force
+
+ENV LANG="en_US.UTF-8"
+ENV LANGUAGE="en_US:en"
+ENV LC_ALL="en_US.UTF-8"
+
+VOLUME /app
+VOLUME /build
+VOLUME /deps
+WORKDIR /app
+
+EXPOSE 4000
+
+CMD ["/docker/command.sh"]
+ENTRYPOINT ["/docker/entrypoint.sh"]

dev/bin/iex

@@ -0,0 +1,4 @@
+#!/bin/bash
+set -euxo pipefail
+
+docker compose -f docker-compose.dev.yml run --rm octocon-app iex -S mix phx.server

dev/bin/setup

@@ -0,0 +1,4 @@
+#!/bin/bash
+set -euxo pipefail
+docker compose -f docker-compose.dev.yml run --rm octocon-app mix setup
+

dev/docker/command.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -euxo pipefail
+
+# mix phx.server
+tail -f /dev/null

dev/docker/entrypoint.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -euxo pipefail
+
+mix deps.get
+
+"$@"

dev/scylla/cassandra-rackdc.eas.properties

@@ -0,0 +1,2 @@
+dc=eas
+rack=rack1

dev/scylla/cassandra-rackdc.eur.properties

@@ -0,0 +1,2 @@
+dc=eur
+rack=rack1

dev/scylla/cassandra-rackdc.gdpr.properties

@@ -0,0 +1,2 @@
+dc=gdpr
+rack=rack1