Merge pull request #42 from kdawgwilk/kaden/gqlgen

Add gqlgen implementation

README.md

@@ -10,6 +10,7 @@ The following open-source GraphQL server libraries provide support for Apollo Fe
 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
 | Dotnet | [graphql-dotnet](https://github.com/graphql-dotnet/graphql-dotnet) | ✔️ | ✔️ | ❌ | ❌ | ❌ | ❌ | ❌ |
 | Elixir | [absinthe_federation](https://github.com/DivvyPayHQ/absinthe_federation) | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ❌ ([coming soon](https://github.com/DivvyPayHQ/absinthe_federation/pull/25)) |
+| Go | [gqlgen](https://gqlgen.com/) | ✔️ | ✔️* | ✔️* | ❌ | ✔️ | ✔️ | ❌ |
 | JavaScript | [apollo-server](https://github.com/apollographql/apollo-server/) | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️  |
 | Java | [federation-jvm](https://github.com/apollographql/federation-jvm) | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️  |
 | Java / Kotlin | [dgs](https://github.com/netflix/dgs-framework/) |  ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️  |
@@ -24,16 +25,8 @@ The following open-source GraphQL server libraries provide support for Apollo Fe
 
 _*_ Implementation does not support multiple `@key` definitions, but all types of `@key` definitions are supported
 
-## "Supported" but full compatibility testing coming soon... 
-
 If you want to see a library added to this list, feel free to open an [Issue](https://github.com/apollographql/apollo-federation-subgraph-compatibility/issues) or check our our [Apollo Federation Library Maintainers Implementation Guide](./CONTRIBUTORS.md) to see about submitting a PR for your library!
 
-> These are libraries that appear to be actively maintained. We audit this list every few months and remove libraries that are no longer active.
-
-| Language    | Framework     | Library                                                                          |
-| ----------- | ------------- | -------------------------------------------------------------------------------- |
-| Go            | [gqlgen](https://github.com/99designs/gqlgen/tree/master/plugin/federation)      | [GitHub Issue](https://github.com/apollographql/apollo-federation-subgraph-compatibility/issues/17)
-
 ## Testing Suite
 
 This repository contains a structured testing suite based on a federated schema that covers the [Apollo Federation Specification](https://www.apollographql.com/docs/federation/federation-spec/). The federated schema is constructued of 3 subgraphs (`users`, `inventory` and `products`) that will be started and used to test various libraries that support Apollo Federation. The `users` and `inventory` subgraphs are provided by this repository in addition to the graph router instance. Library implementors will each implement the `products` schema and provide a docker file that can be used with `docker compose`; templates for these files are provided along with examples.

implementations/gqlgen/Dockerfile

@@ -0,0 +1,11 @@
+# Example Dockerfile from apollo-server
+#
+FROM golang:1.17
+
+WORKDIR /go/src/server
+COPY . .
+
+RUN go get -d -v ./...
+RUN go install -v ./...
+
+CMD /go/bin/server

implementations/gqlgen/docker-compose.yaml

@@ -0,0 +1,6 @@
+services:
+  products:
+    # must be relative to the root of the project
+    build: implementations/gqlgen
+    ports:
+      - 4001:4001

implementations/gqlgen/go.mod

@@ -0,0 +1,26 @@
+module server
+
+go 1.17
+
+require (
+	github.com/99designs/gqlgen v0.14.0
+	github.com/vektah/gqlparser/v2 v2.2.0
+)
+
+require (
+	github.com/agnivade/levenshtein v1.1.0 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/hashicorp/golang-lru v0.5.0 // indirect
+	github.com/matryer/moq v0.0.0-20200106131100-75d0ddfc0007 // indirect
+	github.com/mitchellh/mapstructure v0.0.0-20180203102830-a4e142e9c047 // indirect
+	github.com/pkg/errors v0.8.1 // indirect
+	github.com/russross/blackfriday/v2 v2.0.1 // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	github.com/urfave/cli/v2 v2.1.1 // indirect
+	github.com/vektah/dataloaden v0.2.1-0.20190515034641-a19b9a6e7c9e // indirect
+	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/tools v0.0.0-20210106214847-113979e3529a // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	gopkg.in/yaml.v2 v2.2.4 // indirect
+)

implementations/gqlgen/go.sum

@@ -0,0 +1,107 @@
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implementations/gqlgen/gqlgen.yml

@@ -0,0 +1,56 @@
+# Where are all the schema files located? globs are supported eg  src/**/*.graphqls
+schema:
+  - graph/*.graphql
+
+# Where should the generated server code go?
+exec:
+  filename: graph/generated/generated.go
+  package: generated
+
+# Uncomment to enable federation
+federation:
+  filename: graph/generated/federation.go
+  package: generated
+
+# Where should any generated models go?
+model:
+  filename: graph/model/models_gen.go
+  package: model
+
+# Where should the resolver implementations go?
+resolver:
+  layout: follow-schema
+  dir: graph
+  package: graph
+
+# Optional: turn on use `gqlgen:"fieldName"` tags in your models
+# struct_tag: json
+
+# Optional: turn on to use []Thing instead of []*Thing
+# omit_slice_element_pointers: false
+
+# Optional: set to speed up generation time by not performing a final validation pass.
+# skip_validation: true
+
+# gqlgen will search for any type names in the schema in these go packages
+# if they match it will use them, otherwise it will generate them.
+autobind:
+  - "server/graph/model"
+
+# This section declares type mapping between the GraphQL and go type systems
+#
+# The first line in each type will be used as defaults for resolver arguments and
+# modelgen, the others will be allowed when binding to fields. Configure them to
+# your liking
+models:
+  ID:
+    model:
+      - github.com/99designs/gqlgen/graphql.ID
+      - github.com/99designs/gqlgen/graphql.Int
+      - github.com/99designs/gqlgen/graphql.Int64
+      - github.com/99designs/gqlgen/graphql.Int32
+  Int:
+    model:
+      - github.com/99designs/gqlgen/graphql.Int
+      - github.com/99designs/gqlgen/graphql.Int64
+      - github.com/99designs/gqlgen/graphql.Int32

implementations/gqlgen/graph/directives.graphql

@@ -0,0 +1,9 @@
+directive @goModel(model: String, models: [String!]) on OBJECT
+    | INPUT_OBJECT
+    | SCALAR
+    | ENUM
+    | INTERFACE
+    | UNION
+
+directive @goField(forceResolver: Boolean, name: String) on INPUT_FIELD_DEFINITION
+    | FIELD_DEFINITION

implementations/gqlgen/graph/entity.resolvers.go

@@ -0,0 +1,24 @@
+package graph
+
+// This file will be automatically regenerated based on the schema, any resolver implementations
+// will be copied through when generating and any unknown code will be moved to the end.
+
+import (
+	"context"
+	"server/graph/generated"
+	"server/graph/model"
+)
+
+func (r *entityResolver) FindProductByID(ctx context.Context, id string) (*model.Product, error) {
+	for i := range r.products {
+		if r.products[i].ID == id {
+			return r.products[i], nil
+		}
+	}
+	return nil, nil
+}
+
+// Entity returns generated.EntityResolver implementation.
+func (r *Resolver) Entity() generated.EntityResolver { return &entityResolver{r} }
+
+type entityResolver struct{ *Resolver }