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The extension for building GraphQL APIs with Ash
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lib/graphql/plugin/response_metadata.ex
# SPDX-FileCopyrightText: 2020 ash_graphql contributors <https://github.com/ash-project/ash_graphql/graphs.contributors>
#
# SPDX-License-Identifier: MIT
defmodule AshGraphql.Plugin.ResponseMetadata do
@moduledoc """
Absinthe plugin that captures timing information and injects response metadata.
## Usage
Add this plugin to your schema:
defmodule MyApp.Schema do
use Absinthe.Schema
use AshGraphql, domains: [...], response_metadata: true
def plugins do
[AshGraphql.Plugin.ResponseMetadata | Absinthe.Plugin.defaults()]
end
end
"""
@behaviour Absinthe.Plugin
@doc """
Records start time for duration calculation.
Stores `System.monotonic_time()` in `execution.acc[:ash_graphql][:start_time]`.
Only sets the value if not already present (idempotent).
"""
@impl Absinthe.Plugin
def before_resolution(execution) do
acc =
execution.acc
|> Map.put_new(:ash_graphql, %{})
|> update_in([:ash_graphql], &Map.put_new(&1, :start_time, System.monotonic_time()))
%{execution | acc: acc}
end
@doc """
Records end time for duration calculation.
Stores `System.monotonic_time()` in `execution.acc[:ash_graphql][:end_time]`.
Always overwrites (captures the latest resolution end).
"""
@impl Absinthe.Plugin
def after_resolution(execution) do
end_time = System.monotonic_time()
acc =
execution.acc
|> Map.put_new(:ash_graphql, %{})
|> put_in([:ash_graphql, :end_time], end_time)
%{execution | acc: acc}
end
@doc """
Conditionally adds the metadata injection phase to the pipeline.
If the schema has `response_metadata` enabled, prepends
`AshGraphql.Phase.InjectMetadata` to process the captured timing data.
"""
@impl Absinthe.Plugin
def pipeline(pipeline, execution) do
schema = execution.schema
if function_exported?(schema, :response_metadata, 0) && schema.response_metadata() do
[{AshGraphql.Phase.InjectMetadata, schema: schema} | pipeline]
else
pipeline
end
end
end