feat: add fly.io project (#46)

* feat: add fly.io project

* chore: comment out OTLP config until there's an OTLP endpoint

* chore: comment out kafka_ex dependency from main app

devenv.nix

@@ -46,6 +46,7 @@ in
     pkgs.antora
 
     pkgs.nodePackages_latest.localtunnel
+    pkgs.flyctl
 
     pkgs.zsh
     pkgs.oh-my-zsh

tololo/.dockerignore

@@ -0,0 +1,45 @@
+# This file excludes paths from the Docker build context.
+#
+# By default, Docker's build context includes all files (and folders) in the
+# current directory. Even if a file isn't copied into the container it is still sent to
+# the Docker daemon.
+#
+# There are multiple reasons to exclude files from the build context:
+#
+# 1. Prevent nested folders from being copied into the container (ex: exclude
+#    /assets/node_modules when copying /assets)
+# 2. Reduce the size of the build context and improve build time (ex. /build, /deps, /doc)
+# 3. Avoid sending files containing sensitive information
+#
+# More information on using .dockerignore is available here:
+# https://docs.docker.com/engine/reference/builder/#dockerignore-file
+
+.dockerignore
+
+# Ignore git, but keep git HEAD and refs to access current commit hash if needed:
+#
+# $ cat .git/HEAD | awk '{print ".git/"$2}' | xargs cat
+# d0b8727759e1e0e7aa3d41707d12376e373d5ecc
+.git
+!.git/HEAD
+!.git/refs
+
+# Common development/test artifacts
+/cover/
+/doc/
+/test/
+/tmp/
+.elixir_ls
+
+# Mix artifacts
+/_build/
+/deps/
+*.ez
+
+# Generated on crash by the VM
+erl_crash.dump
+
+# Static artifacts - These should be fetched and built inside the Docker image
+/assets/node_modules/
+/priv/static/assets/
+/priv/static/cache_manifest.json

tololo/Dockerfile

@@ -0,0 +1,104 @@
+# Find eligible builder and runner images on Docker Hub. We use Ubuntu/Debian
+# instead of Alpine to avoid DNS resolution issues in production.
+#
+# https://hub.docker.com/r/hexpm/elixir/tags?page=1&name=ubuntu
+# https://hub.docker.com/_/ubuntu?tab=tags
+#
+# This file is based on these images:
+#
+#   - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
+#   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20250113-slim - for the release image
+#   - https://pkgs.org/ - resource for finding needed packages
+#   - Ex: hexpm/elixir:1.18.1-erlang-26.2.5.6-debian-bullseye-20250113-slim
+#
+ARG ELIXIR_VERSION=1.18.1
+ARG OTP_VERSION=26.2.5.6
+ARG DEBIAN_VERSION=bullseye-20250113-slim
+
+ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
+ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
+
+FROM ${BUILDER_IMAGE} as builder
+
+# install build dependencies
+RUN apt-get update -y && apt-get install -y build-essential git \
+    && apt-get clean && rm -f /var/lib/apt/lists/*_*
+
+# prepare build dir
+WORKDIR /app
+
+# install hex + rebar
+RUN mix local.hex --force && \
+    mix local.rebar --force
+
+# set build ENV
+ENV MIX_ENV="prod"
+
+# install mix dependencies
+COPY mix.exs mix.lock ./
+RUN mix deps.get --only $MIX_ENV
+
+COPY config config
+
+COPY extensions extensions
+
+COPY core core
+
+COPY priv priv
+
+COPY lib lib
+
+COPY assets assets
+
+WORKDIR /app/core
+RUN mix compile
+
+WORKDIR /app
+
+RUN mix deps.get
+RUN mix deps.compile
+
+# compile assets
+RUN mix assets.deploy
+
+# Compile the release
+RUN mix compile
+
+# Changes to config/runtime.exs don't require recompiling the code
+COPY config/runtime.exs config/
+
+COPY rel rel
+RUN mix release
+
+# start a new build stage so that the final image will only contain
+# the compiled release and other runtime necessities
+FROM ${RUNNER_IMAGE}
+
+RUN apt-get update -y && \
+  apt-get install -y libstdc++6 openssl libncurses5 locales ca-certificates \
+  && apt-get clean && rm -f /var/lib/apt/lists/*_*
+
+# Set the locale
+RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
+
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+
+WORKDIR "/app"
+RUN chown nobody /app
+
+# set runner ENV
+ENV MIX_ENV="prod"
+
+# Only copy the final release from the build stage
+COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/tololo ./
+
+USER nobody
+
+# If using an environment that doesn't automatically reap zombie processes, it is
+# advised to add an init process such as tini via `apt-get install`
+# above and adding an entrypoint. See https://github.com/krallin/tini for details
+# ENTRYPOINT ["/tini", "--"]
+
+CMD ["/app/bin/server"]

tololo/config/runtime.exs

@@ -30,9 +30,9 @@ if config_env() == :prod do
 
   maybe_ipv6 = if System.get_env("ECTO_IPV6") in ~w(true 1), do: [:inet6], else: []
 
-  config :opentelemetry_exporter,
-    otlp_protocol: :http_protobuf,
-    otlp_endpoint: System.fetch_env!("OTLP_ENDPOINT")
+  # config :opentelemetry_exporter,
+  #   otlp_protocol: :http_protobuf,
+  #   otlp_endpoint: System.fetch_env!("OTLP_ENDPOINT")
 
   config :tololo, Tololo.Repo,
     # ssl: true,

tololo/fly.toml

@@ -0,0 +1,35 @@
+# fly.toml app configuration file generated for tololo on 2025-02-18T09:06:46-03:00
+#
+# See https://fly.io/docs/reference/configuration/ for information about how to use this file.
+#
+
+app = 'tololo'
+primary_region = 'scl'
+kill_signal = 'SIGTERM'
+
+[build]
+
+[deploy]
+  release_command = '/app/bin/migrate'
+
+[env]
+  PHX_HOST = 'tololo.fly.dev'
+  PORT = '8080'
+
+[http_service]
+  internal_port = 8080
+  force_https = true
+  auto_stop_machines = 'stop'
+  auto_start_machines = true
+  min_machines_running = 0
+  processes = ['app']
+
+  [http_service.concurrency]
+    type = 'connections'
+    hard_limit = 1000
+    soft_limit = 1000
+
+[[vm]]
+  memory = '1gb'
+  cpu_kind = 'shared'
+  cpus = 1

tololo/lib/tololo/release.ex

@@ -0,0 +1,28 @@
+defmodule Tololo.Release do
+  @moduledoc """
+  Used for executing DB release tasks when run in production without Mix
+  installed.
+  """
+  @app :tololo
+
+  def migrate do
+    load_app()
+
+    for repo <- repos() do
+      {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :up, all: true))
+    end
+  end
+
+  def rollback(repo, version) do
+    load_app()
+    {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :down, to: version))
+  end
+
+  defp repos do
+    Application.fetch_env!(@app, :ecto_repos)
+  end
+
+  defp load_app do
+    Application.load(@app)
+  end
+end

tololo/mix.exs

@@ -68,7 +68,7 @@ defmodule Tololo.MixProject do
       {:jason, "~> 1.2"},
       {:dns_cluster, "~> 0.1.1"},
       {:bandit, "~> 1.5"},
-      {:kafka_ex, "~> 0.11"},
+      # {:kafka_ex, "~> 0.11"},
       {:credo, "~> 1.7", only: [:dev, :test], runtime: false},
       {:ex_doc, "~> 0.36", only: [:dev, :test], runtime: false},
       {:opentelemetry_exporter, "~> 1.8.0"},

tololo/rel/env.sh.eex

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# configure node for distributed erlang with IPV6 support
+export ERL_AFLAGS="-proto_dist inet6_tcp"
+export ECTO_IPV6="true"
+export DNS_CLUSTER_QUERY="${FLY_APP_NAME}.internal"
+export RELEASE_DISTRIBUTION="name"
+export RELEASE_NODE="${FLY_APP_NAME}-${FLY_IMAGE_REF##*-}@${FLY_PRIVATE_IP}"
+
+# Uncomment to send crash dumps to stderr
+# This can be useful for debugging, but may log sensitive information
+# export ERL_CRASH_DUMP=/dev/stderr
+# export ERL_CRASH_DUMP_BYTES=4096

tololo/rel/overlays/bin/migrate

@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+cd -P -- "$(dirname -- "$0")"
+exec ./tololo eval Tololo.Release.migrate

tololo/rel/overlays/bin/migrate.bat

@@ -0,0 +1 @@
+call "%~dp0\tololo" eval Tololo.Release.migrate

tololo/rel/overlays/bin/server

@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+cd -P -- "$(dirname -- "$0")"
+PHX_SERVER=true exec ./tololo start

tololo/rel/overlays/bin/server.bat

@@ -0,0 +1,2 @@
+set PHX_SERVER=true
+call "%~dp0\tololo" start