feat: create @requires integration that functions like a normal resolver #3292

clayne11 · 2024-09-18T18:08:41Z

The explicit_requires flag currently generates the @requires resolver inside the execution context. It also doesn't use the normal resolver resolution process and adds a custom implementation that is always called, even if the field isn't requested.

The new computed_requires flag looks for @requires directives and mutates the schema to add dynamic field arguments and directives that are used internally by gqlgen.

These additional directives (@entityReference and @populateFromRepresentations) are runtime directives that "computed_requires" adds implementations for that enable us to fetch the correct data from the representations array and populated it into the dynamic argument for the @requires field.

The new implementation still isn't typesafe and generates the required fields into a map[string]any. This is the same as the existing explicit_requires implementation.

We will follow up with type safety in a future PR. To support type safety we need to generate types and marshaling logic for GraphQL operations (vs just schemas like we do today) which is a large lift.

I have:

Added tests covering the bug / feature (see testing)
Updated any relevant documentation (see docs)

@requires

The "explicit_requires" flag current generates the @requires resolver inside the execution context. It also doesn't use the normal resolver resolution process and adds a custom implementation that is always called, even if the field isn't requested. The new "computed_requires" flag looks for @requires directives and mutates the schema to add dynamic field arguments and directives that are used internally by gqlgen. These additional directives (@entityReference and @populateFromRepresentations) are runtime directives that "computed_requires" adds implementations for that enable us to fetch the correct data from the representations array and populated it into the dynamic argument for the @requires field.

…tions.

clayne11 · 2024-09-18T18:09:20Z

_examples/federation/products/gqlgen.yml

@@ -66,3 +67,5 @@ models:
 - github.com/99designs/gqlgen/graphql.Int
 - github.com/99designs/gqlgen/graphql.Int64
 - github.com/99designs/gqlgen/graphql.Int32
+
+omit_complexity: true


Simply reduces generated code for unused features. Not a material change.

clayne11 · 2024-09-18T18:17:08Z

_examples/federation/reviews/graph/schema.resolvers.go

@@ -11,23 +11,62 @@ import (
 "github.com/99designs/gqlgen/_examples/federation/reviews/graph/model"
 )

+// ManufacturerID is the resolver for the manufacturerID field.
+func (r *productResolver) ManufacturerID(ctx context.Context, obj *model.Product, federationRequires map[string]interface{}) (*string, error) {


New resolver function automatically generated and includes the @requires fields in the federationRequires map.

clayne11 · 2024-09-18T18:18:51Z

codegen/data.go

@@ -97,7 +121,7 @@ func BuildData(cfg *config.Config, plugins ...any) (*Data, error) {

 dataDirectives := make(map[string]*Directive)
 for name, d := range b.Directives {
- if !d.Builtin {
+ if !d.SkipRuntime {


Renamed this — BuiltIn didn't accurately describe the behavior.

clayne11 · 2024-09-18T18:19:30Z

codegen/data_test.go

+ Name: "excludeDirective",
+ Args: nil,
+ DirectiveConfig: config.DirectiveConfig{
+ SkipRuntime: false,


Used composition here in the underlying struct so I needed to update the instantiation.

clayne11 · 2024-09-18T18:20:01Z

codegen/directive.go

+ Name string
+ Args []*FieldArgument
+
+ config.DirectiveConfig


There can be multiple config properties, I thought it was easier to just pass this through. I can change this to individual parameters and map them onto the object if you'd prefer.

clayne11 · 2024-09-18T18:21:34Z

codegen/directive.go

+
+func (d *Directive) CallPath() string {
+ if d.IsBuiltIn() {
+ return "builtInDirective" + d.CallName()


We now have two types of directives: user provided and "built in" where the implementation is statically provided by the plug in.

For builtIn directives we call a static function vs an instance function.

StevenACoffman · 2024-09-18T20:07:36Z

plugin/resolvergen/testdata/filetemplate/out/schema.custom.go

+// - When renaming or deleting a resolver the old code will be put in here. You can safely delete
+// it when you're done.
+// - You have helper methods in this file. Move them out to keep these resolver files clean.
+/*
+ func AUserHelperFunction() {
 // AUserHelperFunction implementation
 }
+*/


This change is causing one test to fail

I reverted it but this change gets made automatically when I run go test ./.... I think we need to revert #3243.

Ah, crud. huh. Either that, or rethink how we do testing for that behavior.

Yeah potentially. Either way, I would revert for now, we can fix it later. I don't want master to be in a broken state. We should also update CI to ensure the git state isn't dirty after running the tests.

StevenACoffman · 2024-09-18T20:08:27Z

plugin/resolvergen/testdata/followschema/out/schema.resolvers.go

+// - When renaming or deleting a resolver the old code will be put in here. You can safely delete
+// it when you're done.
+// - You have helper methods in this file. Move them out to keep these resolver files clean.
+/*
+ func AUserHelperFunction() {
 // AUserHelperFunction implementation
 }
+*/


This change is causing one test to fail

coveralls · 2024-09-18T20:18:18Z

coverage: 58.813% (-0.7%) from 59.525%
when pulling 0508cef on uber:curtis.layne/requires-no-types
into e81a387 on 99designs:master.

clayne11 added 6 commits September 18, 2024 10:59

Add mechanism for supporting statically provided directive implementa…

3ba9fe3

…tions.

Get @populateFromRepresentations working

a2e1636

Add tests for computedrequires

06c7062

Update documentation

ae055c0

Ensure everyone that should be is using version 2

b41ae1a

clayne11 commented Sep 18, 2024

View reviewed changes

clayne11 force-pushed the curtis.layne/requires-no-types branch 2 times, most recently from a01332f to 2dcfdb3 Compare September 18, 2024 19:45

StevenACoffman reviewed Sep 18, 2024

View reviewed changes

Fix linter issues

0508cef

clayne11 force-pushed the curtis.layne/requires-no-types branch from 2dcfdb3 to 0508cef Compare September 18, 2024 20:15

StevenACoffman merged commit b020c09 into 99designs:master Sep 18, 2024
16 of 17 checks passed

StevenACoffman added the federation Related to Apollo federation label Sep 20, 2024

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feat: create @requires integration that functions like a normal resolver #3292

feat: create @requires integration that functions like a normal resolver #3292

clayne11 commented Sep 18, 2024

clayne11 Sep 18, 2024

clayne11 Sep 18, 2024

clayne11 Sep 18, 2024

clayne11 Sep 18, 2024

clayne11 Sep 18, 2024 •

edited

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coveralls commented Sep 18, 2024

feat: create @requires integration that functions like a normal resolver #3292

feat: create @requires integration that functions like a normal resolver #3292

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clayne11 commented Sep 18, 2024

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coveralls commented Sep 18, 2024

clayne11 Sep 18, 2024 •

edited

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