[add] code from part 0 to part 5

Author: yoelfme

.formatter.exs

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+[
+  import_deps: [:ecto, :phoenix],
+  inputs: ["*.{ex,exs}", "priv/*/seeds.exs", "{config,lib,test}/**/*.{ex,exs}"],
+  subdirectories: ["priv/*/migrations"]
+]

.gitignore

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+# 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").
+bank_api-*.tar
+
+# Since we are building assets from assets/,
+# we ignore priv/static. You may want to comment
+# this depending on your deployment strategy.
+/priv/static/

README.md

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+# BankAPI
+
+To start your Phoenix server:
+
+  * Install dependencies with `mix deps.get`
+  * Create and migrate your database with `mix ecto.setup`
+  * Start Phoenix endpoint with `mix phx.server`
+
+Now you can visit [`localhost:4000`](http://localhost:4000) from your browser.
+
+Ready to run in production? Please [check our deployment guides](https://hexdocs.pm/phoenix/deployment.html).
+
+## Learn more
+
+  * Official website: https://www.phoenixframework.org/
+  * Guides: https://hexdocs.pm/phoenix/overview.html
+  * Docs: https://hexdocs.pm/phoenix
+  * Forum: https://elixirforum.com/c/phoenix-forum
+  * Source: https://github.com/phoenixframework/phoenix

config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+#
+# This configuration file is loaded before any dependency and
+# is restricted to this project.
+
+# General application configuration
+use Mix.Config
+
+config :bank_api,
+  namespace: BankAPI,
+  ecto_repos: [BankAPI.Repo]
+
+# Configures the endpoint
+config :bank_api, BankAPIWeb.Endpoint,
+  url: [host: "localhost"],
+  secret_key_base: "WSEiTWVZkM+GvZH2yzDbSQMvqD9HwFrKoLRDhH2OcyVDDcAxDe3IJznYI3RThTqp",
+  render_errors: [view: BankAPIWeb.ErrorView, accepts: ~w(json), layout: false],
+  pubsub_server: BankAPI.PubSub,
+  live_view: [signing_salt: "ivJ8OM2T"]
+
+# Configures Elixir's Logger
+config :logger, :console,
+  format: "$time $metadata[$level] $message\n",
+  metadata: [:request_id]
+
+# Use Jason for JSON parsing in Phoenix
+config :phoenix, :json_library, Jason
+
+# Configuring event store for Commanded that implement CQRS/ES
+config :bank_api, event_stores: [BankAPI.EventStore]
+config :bank_api, BankAPI.EventStore, serializer: Commanded.Serialization.JsonSerializer
+
+# Import environment specific config. This must remain at the bottom
+# of this file so it overrides the configuration defined above.
+import_config "#{Mix.env()}.exs"

config/dev.exs

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+use Mix.Config
+
+# Configure your database
+config :bank_api, BankAPI.Repo,
+  username: "postgres",
+  password: "postgres",
+  database: "bank_api_dev",
+  hostname: "localhost",
+  show_sensitive_data_on_connection_error: true,
+  pool_size: 10
+
+config :bank_api, BankAPI.EventStore,
+  serializer: Commanded.Serialization.JsonSerializer,
+  types: EventStore.PostgresTypes,
+  username: "postgres",
+  password: "postgres",
+  database: "bank_api_eventstore_dev",
+  hostname: "localhost",
+  pool_size: 10
+
+# For development, we disable any cache and enable
+# debugging and code reloading.
+#
+# The watchers configuration can be used to run external
+# watchers to your application. For example, we use it
+# with webpack to recompile .js and .css sources.
+config :bank_api, BankAPIWeb.Endpoint,
+  http: [port: 4000],
+  debug_errors: true,
+  code_reloader: true,
+  check_origin: false,
+  watchers: []
+
+# ## SSL Support
+#
+# In order to use HTTPS in development, a self-signed
+# certificate can be generated by running the following
+# Mix task:
+#
+#     mix phx.gen.cert
+#
+# Note that this task requires Erlang/OTP 20 or later.
+# Run `mix help phx.gen.cert` for more information.
+#
+# The `http:` config above can be replaced with:
+#
+#     https: [
+#       port: 4001,
+#       cipher_suite: :strong,
+#       keyfile: "priv/cert/selfsigned_key.pem",
+#       certfile: "priv/cert/selfsigned.pem"
+#     ],
+#
+# If desired, both `http:` and `https:` keys can be
+# configured to run both http and https servers on
+# different ports.
+
+# Do not include metadata nor timestamps in development logs
+config :logger, :console, format: "[$level] $message\n"
+
+# Set a higher stacktrace during development. Avoid configuring such
+# in production as building large stacktraces may be expensive.
+config :phoenix, :stacktrace_depth, 20
+
+# Initialize plugs at runtime for faster development compilation
+config :phoenix, :plug_init_mode, :runtime

config/prod.exs

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+use Mix.Config
+
+# For production, don't forget to configure the url host
+# to something meaningful, Phoenix uses this information
+# when generating URLs.
+#
+# Note we also include the path to a cache manifest
+# containing the digested version of static files. This
+# manifest is generated by the `mix phx.digest` task,
+# which you should run after static files are built and
+# before starting your production server.
+config :bank_api, BankAPIWeb.Endpoint,
+  url: [host: "example.com", port: 80],
+  cache_static_manifest: "priv/static/cache_manifest.json"
+
+# Do not print debug messages in production
+config :logger, level: :info
+
+# ## SSL Support
+#
+# To get SSL working, you will need to add the `https` key
+# to the previous section and set your `:url` port to 443:
+#
+#     config :bank_api, BankAPIWeb.Endpoint,
+#       ...
+#       url: [host: "example.com", port: 443],
+#       https: [
+#         port: 443,
+#         cipher_suite: :strong,
+#         keyfile: System.get_env("SOME_APP_SSL_KEY_PATH"),
+#         certfile: System.get_env("SOME_APP_SSL_CERT_PATH"),
+#         transport_options: [socket_opts: [:inet6]]
+#       ]
+#
+# The `cipher_suite` is set to `:strong` to support only the
+# latest and more secure SSL ciphers. This means old browsers
+# and clients may not be supported. You can set it to
+# `:compatible` for wider support.
+#
+# `:keyfile` and `:certfile` expect an absolute path to the key
+# and cert in disk or a relative path inside priv, for example
+# "priv/ssl/server.key". For all supported SSL configuration
+# options, see https://hexdocs.pm/plug/Plug.SSL.html#configure/1
+#
+# We also recommend setting `force_ssl` in your endpoint, ensuring
+# no data is ever sent via http, always redirecting to https:
+#
+#     config :bank_api, BankAPIWeb.Endpoint,
+#       force_ssl: [hsts: true]
+#
+# Check `Plug.SSL` for all available options in `force_ssl`.
+
+# Finally import the config/prod.secret.exs which loads secrets
+# and configuration from environment variables.
+import_config "prod.secret.exs"

config/prod.secret.exs

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+# In this file, we load production configuration and secrets
+# from environment variables. You can also hardcode secrets,
+# although such is generally not recommended and you have to
+# remember to add this file to your .gitignore.
+use Mix.Config
+
+database_url =
+  System.get_env("DATABASE_URL") ||
+    raise """
+    environment variable DATABASE_URL is missing.
+    For example: ecto://USER:PASS@HOST/DATABASE
+    """
+
+config :bank_api, BankAPI.Repo,
+  # ssl: true,
+  url: database_url,
+  pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")
+
+secret_key_base =
+  System.get_env("SECRET_KEY_BASE") ||
+    raise """
+    environment variable SECRET_KEY_BASE is missing.
+    You can generate one by calling: mix phx.gen.secret
+    """
+
+config :bank_api, BankAPIWeb.Endpoint,
+  http: [
+    port: String.to_integer(System.get_env("PORT") || "4000"),
+    transport_options: [socket_opts: [:inet6]]
+  ],
+  secret_key_base: secret_key_base
+
+# ## Using releases (Elixir v1.9+)
+#
+# If you are doing OTP releases, you need to instruct Phoenix
+# to start each relevant endpoint:
+#
+#     config :bank_api, BankAPIWeb.Endpoint, server: true
+#
+# Then you can assemble a release by calling `mix release`.
+# See `mix help release` for more information.

config/test.exs

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+use Mix.Config
+
+# Configure your database
+#
+# The MIX_TEST_PARTITION environment variable can be used
+# to provide built-in test partitioning in CI environment.
+# Run `mix help test` for more information.
+config :bank_api, BankAPI.Repo,
+  username: "postgres",
+  password: "postgres",
+  database: "bank_api_test#{System.get_env("MIX_TEST_PARTITION")}",
+  hostname: "localhost"
+
+# We don't run a server during test. If one is required,
+# you can enable the server option below.
+config :bank_api, BankAPIWeb.Endpoint,
+  http: [port: 4002],
+  server: false
+
+config :bank_api, :event_store,
+  serializer: Commanded.Serialization.JsonSerializer,
+  adapter: Commanded.EventStore.Adapters.InMemory
+
+# config :commanded, event_store_adapter: Commanded.EventStore.Adapters.InMemory
+config :commanded, Commanded.EventStore.Adapters.InMemory,
+  serializer: Commanded.Serialization.JsonSerializer,
+  consistency: :strong
+
+# Print only warnings and errors during test
+config :logger, level: :warn

lib/bank_api.ex

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+defmodule BankAPI do
+  @moduledoc """
+  BankAPI keeps the contexts that define your domain
+  and business logic.
+
+  Contexts are also responsible for managing your data, regardless
+  if it comes from the database, an external API or others.
+  """
+end

lib/bank_api/accounts.ex

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+defmodule BankAPI.Accounts do
+  @moduledoc """
+  The Accounts context
+  """
+  alias BankAPI.Repo
+  alias BankAPI.EventApp
+  alias BankAPI.Accounts.Commands.{
+    OpenAccount,
+    CloseAccount,
+    DepositIntoAccount,
+    WithdrawFromAccount
+  }
+  alias BankAPI.Accounts.Projections.Account
+
+  import Ecto.Query, warn: false
+
+  def uuid_regex do
+    ~r/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/
+  end
+
+  def get_account(id), do: Repo.get!(Account, id)
+
+  def close_account(id) do
+    %CloseAccount{
+      account_id: id
+    }
+    |> EventApp.dispatch()
+  end
+
+  def deposit(id, amount) do
+    dispatch_result = %DepositIntoAccount{
+      account_id: id,
+      deposit_amount: amount
+    }
+    |> EventApp.dispatch(consistency: :strong)
+
+    case dispatch_result do
+      :ok ->
+        {
+          :ok,
+          Repo.get!(Account, id)
+        }
+
+      reply ->
+        reply
+    end
+  end
+
+  def withdraw(id, amount) do
+    dispatch_result =
+      %WithdrawFromAccount{
+        account_id: id,
+        withdraw_amount: amount
+      }
+      |> EventApp.dispatch(consistency: :strong)
+
+    case dispatch_result do
+      :ok -> {
+        :ok,
+        Repo.get!(Account, id)
+      }
+
+      reply ->
+        reply
+    end
+  end
+
+  def open_account(%{"initial_balance" => initial_balance}) do
+    account_id = UUID.uuid4()
+
+    dispatch_result = %OpenAccount{
+      initial_balance: initial_balance,
+      account_id: account_id
+    }
+    |> EventApp.dispatch(consistency: :strong)
+
+    case dispatch_result do
+      :ok ->
+        {
+          :ok,
+          # get_account(account_id)
+          %Account{
+            id: account_id,
+            current_balance: initial_balance,
+            status: Account.status().open
+          }
+        }
+
+      reply ->
+        reply
+    end
+  end
+
+  def open_account(_params), do: {:error, :bad_command}
+end