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ex_debug_toolbar

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A debug web toolbar for Phoenix projects to display all sorts of information about request

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ex_debug_toolbar lib ex_debug_toolbar database breakpoint_repo.ex
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lib/ex_debug_toolbar/database/breakpoint_repo.ex 

defmodule ExDebugToolbar.Database.BreakpointRepo do

  @moduledoc false



  alias ExDebugToolbar.Breakpoint



  @default_capacity_limit 100



  defmodule State do

    @moduledoc false



    defstruct [map: %{}, count: 0, next_add_id: 0, next_remove_id: 1]

  end



  def start_link do

    Agent.start_link(fn -> %State{} end, name: __MODULE__)

  end



  def insert(%Breakpoint{} = breakpoint) do

    __MODULE__

    |> Agent.update(fn state ->

      state

      |> ensure_capacity_under_limit

      |> Map.update!(:map, &Map.put(&1, breakpoint.id, {breakpoint, state.next_add_id}))

      |> Map.update!(:next_add_id, &(&1 + 1))

    end)

  end



  def delete(id) do

    __MODULE__

    |> Agent.update(fn state ->

      Map.update!(state, :map, &Map.delete(&1, id))

    end)

  end



  def get(id) do

    case Agent.get(__MODULE__, &Map.fetch(&1.map, id)) do

      {:ok, {breakpoint, _}} -> {:ok, breakpoint}

      :error -> {:error, :not_found}

    end

  end



  def all do

    __MODULE__

    |> Agent.get(&(&1.map))

    |> Map.values

    |> Enum.sort_by(fn {_, id} -> -id end)

    |> Enum.map(fn {breakpoint, _} -> breakpoint end)

  end



  def purge do

    Agent.update(__MODULE__, fn _ -> %State{} end)

  end



  defp ensure_capacity_under_limit(state) do

    limit = Application.get_env(:ex_debug_toolbar, :breakpoints_limit, @default_capacity_limit)

    if state.count >= limit do

      state

      |> Map.update!(:map, &Map.delete(&1, state.next_remove_id))

      |> Map.update!(:next_remove_id, &(&1 + 1))

    else

      Map.update!(state, :count, &(&1 + 1))

    end

  end

end