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Add Angel functionality for handling subscription streams

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This commit is contained in:
Tobe O 2019-03-29 15:39:52 -04:00
parent b354e7b25c
commit 2bedc2bb00
2 changed files with 36 additions and 18 deletions
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48
angel_graphql/lib/src/graphql_http.dart
View file

@ -1,3 +1,4 @@
import 'dart:async';
import 'dart:convert'; import 'dart:convert';
import 'dart:io'; import 'dart:io';
import 'package:angel_framework/angel_framework.dart'; import 'package:angel_framework/angel_framework.dart';
@ -19,13 +20,30 @@ final Validator graphQlPostBody = new Validator({
/// ///
/// Follows the guidelines listed here: /// Follows the guidelines listed here:
/// https://graphql.org/learn/serving-over-http/ /// https://graphql.org/learn/serving-over-http/
RequestHandler graphQLHttp(GraphQL graphQL) { RequestHandler graphQLHttp(GraphQL graphQL,
{Function(RequestContext, ResponseContext, Stream<Map<String, dynamic>>)
onSubscription}) {
return (req, res) async { return (req, res) async {
var globalVariables = <String, dynamic>{ var globalVariables = <String, dynamic>{
'__requestctx': req, '__requestctx': req,
'__responsectx': res, '__responsectx': res,
}; };
sendGraphQLResponse(result) async {
if (result is Stream<Map<String, dynamic>>) {
if (onSubscription == null) {
throw StateError(
'The GraphQL backend returned a Stream, but no `onSubscription` callback was provided.');
} else {
return await onSubscription(req, res, result);
}
}
return {
'data': result,
};
}
executeMap(Map map) async { executeMap(Map map) async {
var body = await req.parseBody().then((_) => req.bodyAsMap); var body = await req.parseBody().then((_) => req.bodyAsMap);
var text = body['query'] as String; var text = body['query'] as String;
@ -36,15 +54,13 @@ RequestHandler graphQLHttp(GraphQL graphQL) {
variables = json.decode(variables as String); variables = json.decode(variables as String);
} }
return { return await sendGraphQLResponse(await graphQL.parseAndExecute(
'data': await graphQL.parseAndExecute( text,
text, sourceUrl: 'input',
sourceUrl: 'input', operationName: operationName,
operationName: operationName, variableValues: foldToStringDynamic(variables as Map),
variableValues: foldToStringDynamic(variables as Map), globalVariables: globalVariables,
globalVariables: globalVariables, ));
),
};
} }
try { try {
@ -55,13 +71,11 @@ RequestHandler graphQLHttp(GraphQL graphQL) {
} else if (req.method == 'POST') { } else if (req.method == 'POST') {
if (req.headers.contentType?.mimeType == graphQlContentType.mimeType) { if (req.headers.contentType?.mimeType == graphQlContentType.mimeType) {
var text = await req.body.transform(utf8.decoder).join(); var text = await req.body.transform(utf8.decoder).join();
return { return sendGraphQLResponse(await graphQL.parseAndExecute(
'data': await graphQL.parseAndExecute( text,
text, sourceUrl: 'input',
sourceUrl: 'input', globalVariables: globalVariables,
globalVariables: globalVariables, ));
),
};
} else if (req.headers.contentType?.mimeType == 'application/json') { } else if (req.headers.contentType?.mimeType == 'application/json') {
if (await validate(graphQlPostBody)(req, res) as bool) { if (await validate(graphQlPostBody)(req, res) as bool) {
return await executeMap(req.bodyAsMap); return await executeMap(req.bodyAsMap);

4
angel_graphql/pubspec.yaml
View file

@ -7,6 +7,7 @@ environment:
sdk: ">=2.0.0-dev <3.0.0" sdk: ">=2.0.0-dev <3.0.0"
dependencies: dependencies:
angel_framework: ^2.0.0-alpha angel_framework: ^2.0.0-alpha
angel_websocket: ^2.0.0
angel_validate: ^2.0.0-alpha angel_validate: ^2.0.0-alpha
graphql_parser: ^1.0.0 graphql_parser: ^1.0.0
graphql_schema: ^1.0.0 graphql_schema: ^1.0.0
@ -15,3 +16,6 @@ dependencies:
dev_dependencies: dev_dependencies:
angel_serialize: ^2.0.0 angel_serialize: ^2.0.0
logging: ^0.11.0 logging: ^0.11.0
dependency_overrides:
graphql_server:
path: ../graphql_server