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lib/patches.ex
defmodule Patches do
use GenServer
# ----------------------------------------------------------------------------
# Public API
# ----------------------------------------------------------------------------
def start_link(_) do
GenServer.start_link(__MODULE__, %{}, name: __MODULE__)
end
# Create and register a new temp file for a patch, returns {patch_id, path}
def new_patch(contents) do
GenServer.call(__MODULE__, {:new_patch, contents})
end
def get_patch(patch_id) do
GenServer.call(__MODULE__, {:get, patch_id})
end
def delete_patch(patch_id) do
GenServer.call(__MODULE__, {:delete, patch_id})
end
# ----------------------------------------------------------------------------
# GenServer Callbacks
# ----------------------------------------------------------------------------
def init(state) do
{:ok, state}
end
def handle_call({:new_patch, contents}, _from, state) do
{:ok, path} = Briefly.create()
:ok = File.write(path, contents)
patch_id = :erlang.unique_integer([:positive, :monotonic])
{:reply, {patch_id, path}, Map.put(state, patch_id, path)}
end
def handle_call({:get, patch_id}, _from, state) do
case Map.fetch(state, patch_id) do
{:ok, path} -> {:reply, {:ok, path}, state}
:error -> {:reply, {:error, :not_found}, state}
end
end
def handle_call({:delete, patch_id}, _from, state) do
new_state = Map.delete(state, patch_id)
{:reply, :ok, new_state}
end
end