mobilizon.chapril.org-mobil.../lib/mobilizon/resources/resources.ex

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defmodule Mobilizon.Resources do
@moduledoc """
The Resources context.
"""
alias Ecto.Adapters.SQL
alias Ecto.Multi
alias Ecto.UUID
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Resources.Resource
alias Mobilizon.Storage.{Page, Repo}
import Ecto.Query
require Logger
@resource_preloads [:actor, :creator, :children, :parent]
@doc """
Returns the list of recent resources for a group
"""
@spec get_resources_for_group(Actor.t(), integer | nil, integer | nil) :: Page.t()
def get_resources_for_group(%Actor{id: group_id}, page \\ nil, limit \\ nil) do
Resource
|> where(actor_id: ^group_id)
|> order_by(desc: :updated_at)
|> preload([r], [:actor, :creator])
|> Page.build_page(page, limit)
end
@doc """
Returns the list of top-level resources for a group
"""
def get_top_level_resources_for_group(%Actor{id: group_id}, page \\ nil, limit \\ nil) do
get_resources_for_folder(%Resource{id: "root_something", actor_id: group_id}, page, limit)
end
@doc """
Returns the list of resources for a resource folder.
"""
@spec get_resources_for_folder(Resource.t(), integer | nil, integer | nil) :: Page.t()
def get_resources_for_folder(resource, page \\ nil, limit \\ nil)
def get_resources_for_folder(
%Resource{id: "root_" <> _group_id, actor_id: group_id},
page,
limit
) do
Resource
|> where([r], r.actor_id == ^group_id and is_nil(r.parent_id))
|> order_by(asc: :type)
|> preload([r], [:actor, :creator])
|> Page.build_page(page, limit)
end
def get_resources_for_folder(%Resource{id: resource_id}, page, limit) do
Resource
|> where([r], r.parent_id == ^resource_id)
|> order_by(asc: :type)
|> preload([r], [:actor, :creator])
|> Page.build_page(page, limit)
end
@doc """
Get a resource by it's ID
"""
@spec get_resource(integer | String.t()) :: Resource.t() | nil
def get_resource(nil), do: nil
def get_resource(id), do: Repo.get(Resource, id)
@spec get_resource_with_preloads(integer | String.t()) :: Resource.t() | nil
def get_resource_with_preloads(id) do
Resource
|> Repo.get(id)
|> Repo.preload(@resource_preloads)
end
@spec get_resource_by_group_and_path_with_preloads(String.t() | integer, String.t()) ::
Resource.t() | nil
def get_resource_by_group_and_path_with_preloads(group_id, "/") do
with {:ok, %Actor{} = group} <- Actors.get_group_by_actor_id(group_id) do
%Resource{
actor_id: group_id,
id: "root_#{group_id}",
actor: group,
path: "/",
title: "Root"
}
end
end
def get_resource_by_group_and_path_with_preloads(group_id, path) do
Resource
|> Repo.get_by(actor_id: group_id, path: path)
|> Repo.preload(@resource_preloads)
end
@doc """
Get a resource by it's URL
"""
@spec get_resource_by_url(String.t()) :: Resource.t() | nil
def get_resource_by_url(url), do: Repo.get_by(Resource, url: url)
@spec get_resource_by_url_with_preloads(String.t()) :: Resource.t() | nil
def get_resource_by_url_with_preloads(url) do
Resource
|> Repo.get_by(url: url)
|> Repo.preload(@resource_preloads)
end
@doc """
Creates a resource.
"""
@spec create_resource(map) :: {:ok, Resource.t()} | {:error, Ecto.Changeset.t()}
def create_resource(attrs \\ %{}) do
Multi.new()
|> do_find_parent_path(Map.get(attrs, :parent_id))
|> Multi.insert(:insert, fn %{find_parent_path: path} ->
Resource.changeset(%Resource{}, Map.put(attrs, :path, "#{path}/#{attrs.title}"))
end)
|> Repo.transaction()
|> case do
{:ok, %{insert: %Resource{} = resource}} ->
{:ok, resource}
{:error, operation, reason, _changes} ->
{:error, "Error while inserting resource when #{operation} because of #{inspect(reason)}"}
end
end
@doc """
Updates a resource.
Since a resource can be a folder and hold children, we do the following in a transaction:
* Get the parent path so that we can reconstruct the path for current resource (if moved or simply renamed)
* Update all children with the new parent path
* Update the resource path itself
"""
@spec update_resource(Resource.t(), map) :: {:ok, Resource.t()} | {:error, Ecto.Changeset.t()}
def update_resource(%Resource{title: old_title} = resource, attrs) do
Multi.new()
|> find_parent_path(resource, attrs)
|> update_children(resource, attrs)
|> Multi.update(:update, fn %{find_parent_path: path} ->
title = Map.get(attrs, :title, old_title)
Resource.changeset(resource, Map.put(attrs, :path, "#{path}/#{title}"))
end)
|> Repo.transaction()
|> case do
{:ok,
%{
find_parent_path: _parent_path,
update: %Resource{} = resource,
update_children: children
}} ->
resource = Map.put(resource, :children, children)
{:ok, resource}
# collect errors into record changesets
{:error, operation, reason, _changes} ->
{:error, "Error while updating resource when #{operation} because of #{inspect(reason)}"}
end
end
@spec find_parent_path(Multi.t(), Resource.t(), map()) :: Multi.t()
defp find_parent_path(
%Multi{} = multi,
%Resource{parent_id: old_parent_id} = _resource,
attrs
) do
updated_parent_id = Map.get(attrs, :parent_id, old_parent_id)
Logger.debug("Finding parent path for updated_parent_id #{inspect(updated_parent_id)}")
do_find_parent_path(multi, updated_parent_id)
end
@spec do_find_parent_path(Multi.t(), String.t() | nil) :: Multi.t()
defp do_find_parent_path(%Multi{} = multi, nil),
do: Multi.run(multi, :find_parent_path, fn _, _ -> {:ok, ""} end)
defp do_find_parent_path(%Multi{} = multi, parent_id) do
Multi.run(multi, :find_parent_path, fn _repo, _changes ->
case get_resource(parent_id) do
%Resource{path: path} = _resource -> {:ok, path}
_ -> {:error, :not_found}
end
end)
end
@spec update_children(Multi.t(), Resource.t(), map()) :: Multi.t()
defp update_children(
%Multi{} = multi,
%Resource{
id: id,
type: :folder,
title: old_title,
actor_id: actor_id
},
attrs
) do
title = Map.get(attrs, :title, old_title)
Multi.run(multi, :update_children, fn repo, %{find_parent_path: path} ->
{:ok, uuid} = UUID.dump(id)
{query, params} =
{"UPDATE resource SET path = CONCAT($1::text, title) WHERE actor_id = $2 AND parent_id = $3::uuid",
["#{path}/#{title}/", actor_id, uuid]}
{:ok, _} =
SQL.query(
repo,
query,
params
)
children = repo.all(from(r in Resource, where: r.parent_id == ^id))
{:ok, children}
end)
end
defp update_children(multi, _, _),
do: Multi.run(multi, :update_children, fn _, _ -> {:ok, ""} end)
@doc """
Deletes a resource
"""
@spec delete_resource(Resource.t()) :: {:ok, Resource.t()} | {:error, Ecto.Changeset.t()}
def delete_resource(%Resource{} = resource), do: Repo.delete(resource)
end