95 lines
2.7 KiB
Elixir
95 lines
2.7 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Repo do
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use Ecto.Repo,
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otp_app: :pleroma,
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adapter: Ecto.Adapters.Postgres,
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migration_timestamps: [type: :naive_datetime_usec]
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import Ecto.Query
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require Logger
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@doc """
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Dynamically loads the repository url from the
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DATABASE_URL environment variable.
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"""
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def init(_, opts) do
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{:ok, Keyword.put(opts, :url, System.get_env("DATABASE_URL"))}
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end
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@doc "find resource based on prepared query"
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@spec find_resource(Ecto.Query.t()) :: {:ok, struct()} | {:error, :not_found}
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def find_resource(%Ecto.Query{} = query) do
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case __MODULE__.one(query) do
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nil -> {:error, :not_found}
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resource -> {:ok, resource}
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end
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end
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def find_resource(_query), do: {:error, :not_found}
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@doc """
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Gets association from cache or loads if need
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## Examples
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iex> Repo.get_assoc(token, :user)
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%User{}
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"""
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@spec get_assoc(struct(), atom()) :: {:ok, struct()} | {:error, :not_found}
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def get_assoc(resource, association) do
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case __MODULE__.preload(resource, association) do
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%{^association => assoc} when not is_nil(assoc) -> {:ok, assoc}
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_ -> {:error, :not_found}
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end
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end
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@doc """
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Returns a lazy enumerable that emits all entries from the data store matching the given query.
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`returns_as` use to group records. use the `batches` option to fetch records in bulk.
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## Examples
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# fetch records one-by-one
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iex> Pleroma.Repo.chunk_stream(Pleroma.Activity.Queries.by_actor(ap_id), 500)
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# fetch records in bulk
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iex> Pleroma.Repo.chunk_stream(Pleroma.Activity.Queries.by_actor(ap_id), 500, :batches)
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"""
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@spec chunk_stream(Ecto.Query.t(), integer(), atom()) :: Enumerable.t()
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def chunk_stream(query, chunk_size, returns_as \\ :one, query_options \\ []) do
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# We don't actually need start and end functions of resource streaming,
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# but it seems to be the only way to not fetch records one-by-one and
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# have individual records be the elements of the stream, instead of
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# lists of records
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Stream.resource(
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fn -> 0 end,
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fn
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last_id ->
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query
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|> order_by(asc: :id)
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|> where([r], r.id > ^last_id)
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|> limit(^chunk_size)
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|> all(query_options)
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|> case do
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[] ->
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{:halt, last_id}
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records ->
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last_id = List.last(records).id
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if returns_as == :one do
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{records, last_id}
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else
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{[records], last_id}
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end
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end
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end,
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fn _ -> :ok end
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)
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end
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end
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