4e69153e3e
git-subtree-dir: packages/graphql git-subtree-mainline:ac29392d7fgit-subtree-split:33e2f86ba7
98 lines
2.9 KiB
Dart
98 lines
2.9 KiB
Dart
// Inspired by:
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// https://www.apollographql.com/docs/apollo-server/features/subscriptions/#subscriptions-example
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import 'package:angel_file_service/angel_file_service.dart';
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import 'package:angel_framework/angel_framework.dart';
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import 'package:angel_framework/http.dart';
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import 'package:angel_graphql/angel_graphql.dart';
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import 'package:file/local.dart';
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import 'package:graphql_schema/graphql_schema.dart';
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import 'package:graphql_server/graphql_server.dart';
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import 'package:logging/logging.dart';
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main() async {
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var logger = Logger('angel_graphql');
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var app = Angel(logger: logger);
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var http = AngelHttp(app);
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app.logger.onRecord.listen((rec) {
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print(rec);
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if (rec.error != null) print(rec.error);
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if (rec.stackTrace != null) print(rec.stackTrace);
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});
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// Create an in-memory service.
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var fs = LocalFileSystem();
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var postService =
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app.use('/api/posts', JsonFileService(fs.file('posts.json')));
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// Also get a [Stream] of item creation events.
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var postAdded = postService.afterCreated
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.asStream()
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.map((e) => {'postAdded': e.result})
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.asBroadcastStream();
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// GraphQL setup.
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var postType = objectType('Post', fields: [
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field('author', graphQLString),
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field('comment', graphQLString),
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]);
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var schema = graphQLSchema(
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// Hooked up to the postService:
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// type Query { posts: [Post] }
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queryType: objectType(
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'Query',
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fields: [
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field(
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'posts',
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listOf(postType),
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resolve: resolveViaServiceIndex(postService),
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),
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],
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),
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// Hooked up to the postService:
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// type Mutation {
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// addPost(author: String!, comment: String!): Post
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// }
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mutationType: objectType(
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'Mutation',
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fields: [
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field(
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'addPost',
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postType,
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inputs: [
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GraphQLFieldInput(
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'data', postType.toInputObject('PostInput').nonNullable()),
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],
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resolve: resolveViaServiceCreate(postService),
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),
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],
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),
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// Hooked up to `postAdded`:
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// type Subscription { postAdded: Post }
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subscriptionType: objectType(
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'Subscription',
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fields: [
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field('postAdded', postType, resolve: (_, __) => postAdded),
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],
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),
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);
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// Mount GraphQL routes; we'll support HTTP and WebSockets transports.
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app.all('/graphql', graphQLHttp(GraphQL(schema)));
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app.get('/subscriptions',
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graphQLWS(GraphQL(schema), keepAliveInterval: Duration(seconds: 3)));
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app.get('/graphiql',
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graphiQL(subscriptionsEndpoint: 'ws://localhost:3000/subscriptions'));
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var server = await http.startServer('127.0.0.1', 3000);
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var uri =
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Uri(scheme: 'http', host: server.address.address, port: server.port);
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var graphiqlUri = uri.replace(path: 'graphiql');
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var postsUri = uri.replace(pathSegments: ['api', 'posts']);
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print('Listening at $uri');
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print('Access graphiql at $graphiqlUri');
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print('Access posts service at $postsUri');
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}
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