98 lines
2.7 KiB
Elixir
98 lines
2.7 KiB
Elixir
# 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
|
|
|
|
@doc """
|
|
Returns a lazy enumerable that emits all entries from the data store matching the given query.
|
|
|
|
`returns_as` use to group records. use the `batches` option to fetch records in bulk.
|
|
|
|
## Examples
|
|
|
|
# fetch records one-by-one
|
|
iex> Pleroma.Repo.chunk_stream(Pleroma.Activity.Queries.by_actor(ap_id), 500)
|
|
|
|
# fetch records in bulk
|
|
iex> Pleroma.Repo.chunk_stream(Pleroma.Activity.Queries.by_actor(ap_id), 500, :batches)
|
|
"""
|
|
@spec chunk_stream(Ecto.Query.t(), integer(), atom()) :: Enumerable.t()
|
|
def chunk_stream(query, chunk_size, returns_as \\ :one) 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
|
|
|
|
if returns_as == :one do
|
|
{records, last_id}
|
|
else
|
|
{[records], last_id}
|
|
end
|
|
end
|
|
end,
|
|
fn _ -> :ok end
|
|
)
|
|
end
|
|
end
|