Init project.

lib/link_shortener_web/controllers/page_controller.ex

@@ -0,0 +1,7 @@
+defmodule LinkShortenerWeb.PageController do
+  use LinkShortenerWeb, :controller
+
+  def index(conn, _params) do
+    render(conn, "index.html")
+  end
+end

lib/link_shortener_web/endpoint.ex

@@ -0,0 +1,50 @@
+defmodule LinkShortenerWeb.Endpoint do
+  use Phoenix.Endpoint, otp_app: :link_shortener
+
+  # The session will be stored in the cookie and signed,
+  # this means its contents can be read but not tampered with.
+  # Set :encryption_salt if you would also like to encrypt it.
+  @session_options [
+    store: :cookie,
+    key: "_link_shortener_key",
+    signing_salt: "O0shzZgl"
+  ]
+
+  socket "/live", Phoenix.LiveView.Socket, websocket: [connect_info: [session: @session_options]]
+
+  # Serve at "/" the static files from "priv/static" directory.
+  #
+  # You should set gzip to true if you are running phx.digest
+  # when deploying your static files in production.
+  plug Plug.Static,
+    at: "/",
+    from: :link_shortener,
+    gzip: false,
+    only: ~w(assets fonts images favicon.ico robots.txt)
+
+  # Code reloading can be explicitly enabled under the
+  # :code_reloader configuration of your endpoint.
+  if code_reloading? do
+    socket "/phoenix/live_reload/socket", Phoenix.LiveReloader.Socket
+    plug Phoenix.LiveReloader
+    plug Phoenix.CodeReloader
+    plug Phoenix.Ecto.CheckRepoStatus, otp_app: :link_shortener
+  end
+
+  plug Phoenix.LiveDashboard.RequestLogger,
+    param_key: "request_logger",
+    cookie_key: "request_logger"
+
+  plug Plug.RequestId
+  plug Plug.Telemetry, event_prefix: [:phoenix, :endpoint]
+
+  plug Plug.Parsers,
+    parsers: [:urlencoded, :multipart, :json],
+    pass: ["*/*"],
+    json_decoder: Phoenix.json_library()
+
+  plug Plug.MethodOverride
+  plug Plug.Head
+  plug Plug.Session, @session_options
+  plug LinkShortenerWeb.Router
+end

lib/link_shortener_web/gettext.ex

@@ -0,0 +1,24 @@
+defmodule LinkShortenerWeb.Gettext do
+  @moduledoc """
+  A module providing Internationalization with a gettext-based API.
+
+  By using [Gettext](https://hexdocs.pm/gettext),
+  your module gains a set of macros for translations, for example:
+
+      import LinkShortenerWeb.Gettext
+
+      # Simple translation
+      gettext("Here is the string to translate")
+
+      # Plural translation
+      ngettext("Here is the string to translate",
+               "Here are the strings to translate",
+               3)
+
+      # Domain-based translation
+      dgettext("errors", "Here is the error message to translate")
+
+  See the [Gettext Docs](https://hexdocs.pm/gettext) for detailed usage.
+  """
+  use Gettext, otp_app: :link_shortener
+end

lib/link_shortener_web/router.ex

@@ -0,0 +1,56 @@
+defmodule LinkShortenerWeb.Router do
+  use LinkShortenerWeb, :router
+
+  pipeline :browser do
+    plug :accepts, ["html"]
+    plug :fetch_session
+    plug :fetch_live_flash
+    plug :put_root_layout, {LinkShortenerWeb.LayoutView, :root}
+    plug :protect_from_forgery
+    plug :put_secure_browser_headers
+  end
+
+  pipeline :api do
+    plug :accepts, ["json"]
+  end
+
+  scope "/", LinkShortenerWeb do
+    pipe_through :browser
+
+    get "/", PageController, :index
+  end
+
+  # Other scopes may use custom stacks.
+  # scope "/api", LinkShortenerWeb do
+  #   pipe_through :api
+  # end
+
+  # Enables LiveDashboard only for development
+  #
+  # If you want to use the LiveDashboard in production, you should put
+  # it behind authentication and allow only admins to access it.
+  # If your application does not have an admins-only section yet,
+  # you can use Plug.BasicAuth to set up some basic authentication
+  # as long as you are also using SSL (which you should anyway).
+  if Mix.env() in [:dev, :test] do
+    import Phoenix.LiveDashboard.Router
+
+    scope "/" do
+      pipe_through :browser
+
+      live_dashboard "/dashboard", metrics: LinkShortenerWeb.Telemetry
+    end
+  end
+
+  # Enables the Swoosh mailbox preview in development.
+  #
+  # Note that preview only shows emails that were sent by the same
+  # node running the Phoenix server.
+  if Mix.env() == :dev do
+    scope "/dev" do
+      pipe_through :browser
+
+      forward "/mailbox", Plug.Swoosh.MailboxPreview
+    end
+  end
+end

lib/link_shortener_web/telemetry.ex

@@ -0,0 +1,71 @@
+defmodule LinkShortenerWeb.Telemetry do
+  use Supervisor
+  import Telemetry.Metrics
+
+  def start_link(arg) do
+    Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
+  end
+
+  @impl true
+  def init(_arg) do
+    children = [
+      # Telemetry poller will execute the given period measurements
+      # every 10_000ms. Learn more here: https://hexdocs.pm/telemetry_metrics
+      {:telemetry_poller, measurements: periodic_measurements(), period: 10_000}
+      # Add reporters as children of your supervision tree.
+      # {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
+    ]
+
+    Supervisor.init(children, strategy: :one_for_one)
+  end
+
+  def metrics do
+    [
+      # Phoenix Metrics
+      summary("phoenix.endpoint.stop.duration",
+        unit: {:native, :millisecond}
+      ),
+      summary("phoenix.router_dispatch.stop.duration",
+        tags: [:route],
+        unit: {:native, :millisecond}
+      ),
+
+      # Database Metrics
+      summary("link_shortener.repo.query.total_time",
+        unit: {:native, :millisecond},
+        description: "The sum of the other measurements"
+      ),
+      summary("link_shortener.repo.query.decode_time",
+        unit: {:native, :millisecond},
+        description: "The time spent decoding the data received from the database"
+      ),
+      summary("link_shortener.repo.query.query_time",
+        unit: {:native, :millisecond},
+        description: "The time spent executing the query"
+      ),
+      summary("link_shortener.repo.query.queue_time",
+        unit: {:native, :millisecond},
+        description: "The time spent waiting for a database connection"
+      ),
+      summary("link_shortener.repo.query.idle_time",
+        unit: {:native, :millisecond},
+        description:
+          "The time the connection spent waiting before being checked out for the query"
+      ),
+
+      # VM Metrics
+      summary("vm.memory.total", unit: {:byte, :kilobyte}),
+      summary("vm.total_run_queue_lengths.total"),
+      summary("vm.total_run_queue_lengths.cpu"),
+      summary("vm.total_run_queue_lengths.io")
+    ]
+  end
+
+  defp periodic_measurements do
+    [
+      # A module, function and arguments to be invoked periodically.
+      # This function must call :telemetry.execute/3 and a metric must be added above.
+      # {LinkShortenerWeb, :count_users, []}
+    ]
+  end
+end

lib/link_shortener_web/templates/layout/app.html.heex

@@ -0,0 +1,5 @@
+<main class="container">
+  <p class="alert alert-info" role="alert"><%= get_flash(@conn, :info) %></p>
+  <p class="alert alert-danger" role="alert"><%= get_flash(@conn, :error) %></p>
+  <%= @inner_content %>
+</main>

lib/link_shortener_web/templates/layout/live.html.heex

@@ -0,0 +1,11 @@
+<main class="container">
+  <p class="alert alert-info" role="alert"
+    phx-click="lv:clear-flash"
+    phx-value-key="info"><%= live_flash(@flash, :info) %></p>
+
+  <p class="alert alert-danger" role="alert"
+    phx-click="lv:clear-flash"
+    phx-value-key="error"><%= live_flash(@flash, :error) %></p>
+
+  <%= @inner_content %>
+</main>

lib/link_shortener_web/views/error_helpers.ex

@@ -0,0 +1,47 @@
+defmodule LinkShortenerWeb.ErrorHelpers do
+  @moduledoc """
+  Conveniences for translating and building error messages.
+  """
+
+  use Phoenix.HTML
+
+  @doc """
+  Generates tag for inlined form input errors.
+  """
+  def error_tag(form, field) do
+    Enum.map(Keyword.get_values(form.errors, field), fn error ->
+      content_tag(:span, translate_error(error),
+        class: "invalid-feedback",
+        phx_feedback_for: input_name(form, field)
+      )
+    end)
+  end
+
+  @doc """
+  Translates an error message using gettext.
+  """
+  def translate_error({msg, opts}) do
+    # When using gettext, we typically pass the strings we want
+    # to translate as a static argument:
+    #
+    #     # Translate "is invalid" in the "errors" domain
+    #     dgettext("errors", "is invalid")
+    #
+    #     # Translate the number of files with plural rules
+    #     dngettext("errors", "1 file", "%{count} files", count)
+    #
+    # Because the error messages we show in our forms and APIs
+    # are defined inside Ecto, we need to translate them dynamically.
+    # This requires us to call the Gettext module passing our gettext
+    # backend as first argument.
+    #
+    # Note we use the "errors" domain, which means translations
+    # should be written to the errors.po file. The :count option is
+    # set by Ecto and indicates we should also apply plural rules.
+    if count = opts[:count] do
+      Gettext.dngettext(LinkShortenerWeb.Gettext, "errors", msg, msg, count, opts)
+    else
+      Gettext.dgettext(LinkShortenerWeb.Gettext, "errors", msg, opts)
+    end
+  end
+end

lib/link_shortener_web/views/error_view.ex

@@ -0,0 +1,16 @@
+defmodule LinkShortenerWeb.ErrorView do
+  use LinkShortenerWeb, :view
+
+  # If you want to customize a particular status code
+  # for a certain format, you may uncomment below.
+  # def render("500.html", _assigns) do
+  #   "Internal Server Error"
+  # end
+
+  # By default, Phoenix returns the status message from
+  # the template name. For example, "404.html" becomes
+  # "Not Found".
+  def template_not_found(template, _assigns) do
+    Phoenix.Controller.status_message_from_template(template)
+  end
+end

lib/link_shortener_web/views/layout_view.ex

@@ -0,0 +1,7 @@
+defmodule LinkShortenerWeb.LayoutView do
+  use LinkShortenerWeb, :view
+
+  # Phoenix LiveDashboard is available only in development by default,
+  # so we instruct Elixir to not warn if the dashboard route is missing.
+  @compile {:no_warn_undefined, {Routes, :live_dashboard_path, 2}}
+end

lib/link_shortener_web/views/page_view.ex

@@ -0,0 +1,3 @@
+defmodule LinkShortenerWeb.PageView do
+  use LinkShortenerWeb, :view
+end