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A declarative, extensible framework for building Elixir applications.

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ash lib ash data_layer ets.ex
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lib/ash/data_layer/ets.ex

defmodule Ash.DataLayer.Ets do
@moduledoc """
An ETS (Erlang Term Storage) backed Ash Datalayer, for testing.
This is used for testing. *Do not use this data layer in production*
"""
alias Ash.Actions.Sort
@behaviour Ash.DataLayer
@ets %Ash.Dsl.Section{
name: :ets,
describe: """
A section for configuring the ets data layer
""",
examples: [
"""
ets do
# Used in testing
private? true
end
"""
],
schema: [
private?: [
type: :boolean,
default: false
]
]
}
use Ash.Dsl.Extension, sections: [@ets]
alias Ash.Dsl.Extension
@spec private?(Ash.Resource.t()) :: boolean
def private?(resource) do
Extension.get_opt(resource, [:ets], :private?, false, true)
end
defmodule Query do
@moduledoc false
defstruct [:resource, :filter, :limit, :sort, :tenant, :api, relationships: %{}, offset: 0]
end
@impl true
def can?(resource, :async_engine) do
not private?(resource)
end
def can?(_, :composite_primary_key), do: true
def can?(_, :multitenancy), do: true
def can?(_, :upsert), do: true
def can?(_, :create), do: true
def can?(_, :read), do: true
def can?(_, :update), do: true
def can?(_, :destroy), do: true
def can?(_, :sort), do: true
def can?(_, :filter), do: true
def can?(_, :limit), do: true
def can?(_, :offset), do: true
def can?(_, :boolean_filter), do: true
def can?(_, :transact), do: false
def can?(_, {:filter_expr, _}), do: true
def can?(resource, {:join, other_resource}) do
# See the comment in can?/2 in mnesia data layer to explain this
not (private?(resource) and
Ash.DataLayer.data_layer(other_resource) == Ash.DataLayer.Mnesia)
end
def can?(_, :nested_expressions), do: true
def can?(_, {:query_aggregate, :count}), do: true
def can?(_, {:sort, _}), do: true
def can?(_, _), do: false
@impl true
def resource_to_query(resource, api) do
%Query{
resource: resource,
api: api
}
end
@impl true
def limit(query, offset, _), do: {:ok, %{query | limit: offset}}
@impl true
def offset(query, offset, _), do: {:ok, %{query | offset: offset}}
@impl true
def set_tenant(_resource, query, tenant) do
{:ok, %{query | tenant: tenant}}
end
@impl true
def filter(query, filter, _resource) do
{:ok, %{query | filter: filter}}
end
@impl true
def sort(query, sort, _resource) do
{:ok, %{query | sort: sort}}
end
@impl true
def run_aggregate_query(%{api: api} = query, aggregates, resource) do
case run_query(query, resource) do
{:ok, results} ->
Enum.reduce_while(aggregates, {:ok, %{}}, fn
%{kind: :count, name: name, query: query}, {:ok, acc} ->
results
|> filter_matches(Map.get(query || %{}, :filter), api)
|> case do
{:ok, matches} ->
{:cont, {:ok, Map.put(acc, name, Enum.count(matches))}}
{:error, error} ->
{:halt, {:error, error}}
end
_, _ ->
{:halt, {:error, "unsupported aggregate"}}
end)
end
end
@impl true
def run_query(
%Query{
resource: resource,
filter: filter,
offset: offset,
limit: limit,
sort: sort,
tenant: tenant,
api: api
},
_resource
) do
with {:ok, records} <- get_records(resource, tenant),
{:ok, filtered_records} <- filter_matches(records, filter, api) do
offset_records =
filtered_records
|> Sort.runtime_sort(sort)
|> Enum.drop(offset || 0)
limited_records =
if limit do
Enum.take(offset_records, limit)
else
offset_records
end
{:ok, limited_records}
else
{:error, error} -> {:error, error}
end
end
defp get_records(resource, tenant) do
with {:ok, table} <- wrap_or_create_table(resource, tenant),
{:ok, record_tuples} <- ETS.Set.to_list(table) do
{:ok, Enum.map(record_tuples, &elem(&1, 1))}
end
end
defp filter_matches(records, nil, _api), do: {:ok, records}
defp filter_matches(records, filter, api) do
Ash.Filter.Runtime.filter_matches(api, records, filter)
end
@impl true
def upsert(resource, changeset) do
update(resource, changeset)
end
@impl true
def create(resource, changeset) do
pkey =
resource
|> Ash.Resource.Info.primary_key()
|> Enum.into(%{}, fn attr ->
{attr, Ash.Changeset.get_attribute(changeset, attr)}
end)
with {:ok, table} <- wrap_or_create_table(resource, changeset.tenant),
{:ok, record} <- Ash.Changeset.apply_attributes(changeset),
record <- unload_relationships(resource, record),
{:ok, _} <- ETS.Set.put(table, {pkey, record}) do
{:ok, record}
else
{:error, error} -> {:error, error}
end
end
@impl true
def destroy(resource, %{data: record} = changeset) do
pkey = Map.take(record, Ash.Resource.Info.primary_key(resource))
with {:ok, table} <- wrap_or_create_table(resource, changeset.tenant),
{:ok, _} <- ETS.Set.delete(table, pkey) do
:ok
else
{:error, error} -> {:error, error}
end
end
@impl true
def update(resource, changeset) do
create(resource, changeset)
end
defp unload_relationships(resource, record) do
empty = resource.__struct__
resource
|> Ash.Resource.Info.relationships()
|> Enum.reduce(record, fn relationship, record ->
Map.put(record, relationship.name, Map.get(empty, relationship.name))
end)
end
# sobelow_skip ["DOS.StringToAtom"]
defp wrap_or_create_table(resource, tenant) do
table =
if tenant do
String.to_atom(to_string(tenant) <> to_string(resource))
else
resource
end
case ETS.Set.wrap_existing(table) do
{:error, :table_not_found} ->
protection =
if private?(resource) do
:private
else
:public
end
case ETS.Set.new(
name: table,
protection: protection,
ordered: true,
read_concurrency: true
) do
{:ok, tab} ->
{:ok, tab}
{:error, :table_already_exists} ->
ETS.Set.wrap_existing(table)
other ->
other
end
{:ok, table} ->
{:ok, table}
{:error, other} ->
{:error, other}
end
end
end