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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Repo do
use Ecto.Repo,
otp_app: :pleroma,
adapter: Ecto.Adapters.Postgres,
migration_timestamps: [type: :naive_datetime_usec]
import Ecto.Query
require Logger
defmodule Instrumenter, do: use(Prometheus.EctoInstrumenter)
@doc """
Dynamically loads the repository url from the
DATABASE_URL environment variable.
"""
def init(_, opts) do
{:ok, Keyword.put(opts, :url, System.get_env("DATABASE_URL"))}
end
@doc "find resource based on prepared query"
@spec find_resource(Ecto.Query.t()) :: {:ok, struct()} | {:error, :not_found}
def find_resource(%Ecto.Query{} = query) do
case __MODULE__.one(query) do
nil -> {:error, :not_found}
resource -> {:ok, resource}
end
end
def find_resource(_query), do: {:error, :not_found}
@doc """
Gets association from cache or loads if need
## Examples
iex> Repo.get_assoc(token, :user)
%User{}
"""
@spec get_assoc(struct(), atom()) :: {:ok, struct()} | {:error, :not_found}
def get_assoc(resource, association) do
case __MODULE__.preload(resource, association) do
%{^association => assoc} when not is_nil(assoc) -> {:ok, assoc}
_ -> {:error, :not_found}
end
end
def chunk_stream(query, chunk_size) do
# We don't actually need start and end funcitons of resource streaming,
# but it seems to be the only way to not fetch records one-by-one and
# have individual records be the elements of the stream, instead of
# lists of records
Stream.resource(
fn -> 0 end,
fn
last_id ->
query
|> order_by(asc: :id)
|> where([r], r.id > ^last_id)
|> limit(^chunk_size)
|> all()
|> case do
[] ->
{:halt, last_id}
records ->
last_id = List.last(records).id
{records, last_id}
end
end,
fn _ -> :ok end
)
end
end

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