ApolloTracing adds data to your GraphQL query response so that an Apollo Engine can provide insights into your Absinthe-based GraphQL service.
Add :apollo_tracing to your deps
def deps do
[
{:apollo_tracing, "~> 0.4.0"}
]
endApolloTracing uses the Absinthe's middleware functionality to track field-level resolution times. In order to register our custom middleware, you have a few options:
Add use ApolloTracing to your schema file:
def MyApp.Schema do
use Absinthe.Schema
use ApolloTracing
endIf you have a custom middleware stack, add the apollo tracing middlewares to the beginning of your middleware stack:
def middleware(middleware, _field, _object),
do: [ApolloTracing.Middleware.Tracing, ApolloTracing.Middleware.Caching] ++ [...your other middlewares]If you prefer to only add tracing to some fields, you can selectively add tracing information:
field :selected_field, :string do
middleware ApolloTracing.Middleware # Has to be the first middleware
resolve fn _, _ -> {:ok, "this field is now added to be traced"} end
endApolloTracing currently requires you to use a custom Pipeline in order to register 'Phases' in the correct order during resolution. Phases are used for measuring overall query times as well as appending the custom data to the response (including cache hints).
Specify the pipeline in your Absinthe.Plug endpoint:
forward "/graphql", Absinthe.Plug,
schema: MyApp.Schema,
pipeline: {ApolloTracing.Pipeline, :plug}If you have your own pipeline function, you can add the phases directly:
def my_pipeline_creator(config, pipeline_opts) do
config.schema_mod
|> Absinthe.Pipeline.for_document(pipeline_opts)
|> add_my_phases() # w.e your custom phases are
|> ApolloTracing.Pipeline.add_phases() # Add apollo at the end
endWhen you want to just call run a query with tracing, but without going through a Plug endpoint:
def custom_absinthe_runner(query, opts \\ []) do
pipeline = ApolloTracing.Pipeline.default(YourSchema, opts)
case Absinthe.Pipeline.run(query, pipeline) do
{:ok, %{result: result}, _} -> {:ok, result}
{:error, err, _} -> {:ok, err}
end
end
"""
query {
fielda
fieldb
}
"""
|> custom_absinthe_runner()You can configure caching by adding metadata to your Absinthe objects:
object :user do
meta :cache, max_age: 30
end
# or
object :user, meta: [cache: [max_age: 30]] do
# ...
endTo ensure that the object is not cached across users, you can mark it as private:
object :user do
meta :cache, max_age: 30, scope: :private
endSee the Apollo docs for more information about cache scope.