From 579cc97babb748ee8c1d39ae95751d8725d11b2d Mon Sep 17 00:00:00 2001
From: danilo silva <badkill82@gmail.com>
Date: Mon, 8 Jun 2020 21:01:05 +0000
Subject: [PATCH] build: Dockerized application

---
 .dockerignore       | 36 ++++++++++++++++++++++++++++
 Dockerfile          | 58 +++++++++++++++++++++++++++++++++++++++++++++
 config/prod.exs     |  4 ++--
 config/releases.exs | 10 ++++++++
 mix.exs             |  2 +-
 5 files changed, 107 insertions(+), 3 deletions(-)
 create mode 100644 .dockerignore
 create mode 100644 Dockerfile
 create mode 100644 config/releases.exs

diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..c7185d9
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,36 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where 3rd-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+podcast_feed-*.tar
+
+# If NPM crashes, it generates a log, let's ignore it too.
+npm-debug.log
+
+# The directory NPM downloads your dependencies sources to.
+/assets/node_modules/
+
+# Since we are building assets from assets/,
+# we ignore priv/static. You may want to comment
+# this depending on your deployment strategy.
+rel/
+metadata.json
+.buildpacks
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..8e271cd
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,58 @@
+# ---- Build Stage ----
+FROM erlang:21 AS app_builder
+
+# Set environment variables for building the application
+ENV MIX_ENV=prod \
+    TEST=1 \
+    LANG=C.UTF-8
+
+# Fetch the latest version of Elixir (once the 1.9 docker image is available you won't have to do this)
+RUN set -xe \
+  && ELIXIR_DOWNLOAD_URL="https://github.com/elixir-lang/elixir/archive/v1.10.3.tar.gz" \
+  && ELIXIR_DOWNLOAD_SHA256="f3035fc5fdade35c3592a5fa7c8ee1aadb736f565c46b74b68ed7828b3ee1897" \
+  && curl -fSL -o elixir-src.tar.gz $ELIXIR_DOWNLOAD_URL \
+  && echo "$ELIXIR_DOWNLOAD_SHA256  elixir-src.tar.gz" | sha256sum -c - \
+  && mkdir -p /usr/local/src/elixir \
+  && tar -xzC /usr/local/src/elixir --strip-components=1 -f elixir-src.tar.gz \
+  && rm elixir-src.tar.gz \
+  && cd /usr/local/src/elixir \
+  && make install clean
+
+# Install hex and rebar
+RUN mix local.hex --force && \
+    mix local.rebar --force
+
+# Create the application build directory
+RUN mkdir /app
+WORKDIR /app
+
+# Copy over all the necessary application files and directories
+COPY config ./config
+COPY lib ./lib
+COPY priv ./priv
+COPY mix.exs .
+COPY mix.lock .
+
+# Fetch the application dependencies and build the application
+RUN mix deps.get
+RUN mix deps.compile
+RUN mix phx.digest
+RUN mix release
+
+# ---- Application Stage ----
+FROM debian:stretch AS app
+
+ENV LANG=C.UTF-8
+
+# Install openssl
+RUN apt-get update && apt-get install -y openssl
+
+# Copy over the build artifact from the previous step and create a non root user
+RUN useradd --create-home app
+WORKDIR /home/app
+COPY --from=app_builder /app/_build .
+RUN chown -R app: ./prod
+USER app
+
+# Run the Phoenix app
+CMD ["./prod/rel/podcast_feed/bin/podcast_feed", "start"]
diff --git a/config/prod.exs b/config/prod.exs
index 0374bab..0cf94b1 100644
--- a/config/prod.exs
+++ b/config/prod.exs
@@ -16,8 +16,8 @@ config :podcast_feed, PodcastFeedWeb.Endpoint,
   cache_static_manifest: "priv/static/cache_manifest.json",
   server: true,
   root: ".",
-  version: Application.spec(:phoenix_distillery, :vsn),
-  force_ssl: [rewrite_on: [:x_forwarded_proto]]
+  version: Application.spec(:phoenix_distillery, :vsn)
+  # force_ssl: [rewrite_on: [:x_forwarded_proto]]
 
 config :podcast_feed,
   cache_duration: :timer.hours(24)
diff --git a/config/releases.exs b/config/releases.exs
new file mode 100644
index 0000000..56f2c8c
--- /dev/null
+++ b/config/releases.exs
@@ -0,0 +1,10 @@
+import Config
+
+secret_key_base = System.fetch_env!("SECRET_KEY_BASE")
+application_port = System.fetch_env!("APP_PORT")
+application_host = System.fetch_env!("APP_HOST")
+
+config :podcast_feed, PodcastFeedWeb.Endpoint,
+  url: [scheme: "http", host: application_host, port: String.to_integer(application_port)],
+  http: [:inet6, port: String.to_integer(application_port)],
+  secret_key_base: secret_key_base
diff --git a/mix.exs b/mix.exs
index 471af45..9861253 100644
--- a/mix.exs
+++ b/mix.exs
@@ -55,7 +55,7 @@ defmodule PodcastFeed.MixProject do
     [
       {:credo, "~> 1.4", only: [:dev, :test], runtime: false},
       {:dialyxir, "~> 1.0", only: [:dev], runtime: false},
-      {:excoveralls, "~> 0.7", only: [:dev, :test]}
+      {:excoveralls, "~> 0.7", only: [:dev, :test]},
     ]
   end