如何使用 openapi-to-graphql 在环回 4 中启用 graphql 订阅
How to enable graphql subscription in loopback 4 with openapi-to-graphql
根据标题,我在尝试在我的环回 4 应用程序中启用 graphql 订阅时遇到问题。
这是我到目前为止完成的代码。
index.ts
export async function main(options: ApplicationConfig = {}) {
const app = new BackendLb4Application(options)
await app.boot()
await app.start()
const url = app.restServer.url;
const oas: Oas3 = <Oas3><unknown>await app.restServer.getApiSpec()
const {schema} = await createGraphQLSchema(oas, {
operationIdFieldNames: true,
baseUrl: url,
createSubscriptionsFromCallbacks: true,
})
const handler = graphqlHTTP( (request:any, response:any, graphQLParams: any) => ({
schema,
pretty: true,
graphiql: true
}))
app.mountExpressRouter(graphqlPath, handler);
const pubsub = new PubSub()
const ws = createServer(app);
ws.listen(PORT, () => {
new SubscriptionServer(
{
execute,
subscribe,
schema,
onConnect: (params: any, socket: any, ctx: any) => {
console.log(params, 'here on onconnect')
// Add pubsub to context to be used by GraphQL subscribe field
return { pubsub }
}
},
{
server: ws,
path: '/subscriptions'
}
)
})
return app
}
这是我的架构
type Subscription {
"""
Equivalent to PATCH onNotificationUpdate
"""
postRequestQueryCallbackUrlApiNotification(secondInputInput: SecondInputInput): String
"""
Equivalent to PATCH onNotificationUpdate
"""
postRequestQueryCallbackUrlOnNotificationUpdate(firstInputInput: FirstInputInput): String
}
这是我的控制器的例子
@patch('/notification-update', {
operationId: 'notificationUpdate',
description: '**GraphQL notificationUpdate**',
callbacks:[ {
onNotificationUpdate: {
//'{$request.query.callbackUrl}/onNotificationUpdate': {
post: {
requestBody: {
operationId: 'notificationUpdateCallback',
description: 'rasjad',
content: {
'application/json': {
schema: {
title: "firstInput",
type: 'object',
properties: {
userData: {
type: "string"
}
}
}
}
}
},
responses: {
'200': {
description: 'response to subscription',
}
}
}
},
// }
}],
responses: {
'200': {
description: 'Notification PATCH success count',
content: {'application/json': {schema: CountSchema}},
},
},
})
async updateAll(
@requestBody({
content: {
'application/json': {
schema: getModelSchemaRef(Notification, {partial: true}),
},
},
})
notification: Notification,
@param.where(Notification) where?: Where<Notification>,
): Promise<Count> {
return this.notificationRepository.update(notification, where);
}
我已经在我的控制器中定义了回调 object,然后它将在我的模式中创建一个订阅。在 graphiql 上进行了测试,但没有成功。
我不知道从这里到哪里去。我需要自定义解析器还是什么?不确定。
如果有人可以提供帮助,我们将不胜感激。
以防万一其他人也想做同样的事情。
我用 Apollo Server 切换 graphqlHTTP
来创建我的 graphql 服务器。
所以我的最终 index.ts
看起来像这样。
export async function main(options: ApplicationConfig = {}) {
const lb4Application = new BackendLb4Application(options)
await lb4Application.boot()
await lb4Application.migrateSchema()
await lb4Application.start()
const url = lb4Application.restServer.url;
const graphqlPath = '/graphql'
// Get the OpenApiSpec
const oas: Oas3 = <Oas3><unknown>await lb4Application.restServer.getApiSpec()
// Create GraphQl Schema from OpenApiSpec
const {schema} = await createGraphQLSchema(oas, {
strict: false,
viewer: true,
baseUrl: url,
headers: {
'X-Origin': 'GraphQL'
},
createSubscriptionsFromCallbacks: true,
customResolvers: {
"lb4-title": {
"your-path":{
patch: (obj, args, context, info) => {
const num = Math.floor(Math.random() * 10);
pubsub.publish("something", { yourMethodName: {count: num} }).catch((err: any) => {
console.log(err)
})
return {count: 1}
}
}
}
},
customSubscriptionResolvers: {
"lb4-title" : {
"yourMethodName": {
post: {
subscribe: () => pubsub.asyncIterator("something"),
resolve: (obj: any, args: any, context, info) => {
console.log(obj, 'obj')
}
}
}
}
}
})
const app = express();
const server = new ApolloServer({
schema,
plugins: [{
async serverWillStart() {
return {
async drainServer() {
subscriptionServers.close();
}
};
}
}],
})
const subscriptionServers = SubscriptionServer.create(
{
// This is the `schema` we just created.
schema,
// These are imported from `graphql`.
execute,
subscribe,
},
{
server: lb4Application.restServer.httpServer?.server,
path: server.graphqlPath,
//path: server.graphqlPath,
}
);
await server.start();
server.applyMiddleware({ app, path: "/" });
lb4Application.mountExpressRouter('/graphql', app);
return lb4Application
}
您还需要像这样在控制器中定义 callbacks
对象。
@patch('/something-update', {
operationId: 'somethingUpdate',
description: '**GraphQL somethingUpdate**',
callbacks:[
{
yourMethodName: {
post: {
responses: {
'200': {
description: 'response to subscription',
content: {'application/json': {schema: CountSchema}},
}
}
}
},
}
],
responses: {
'200': {
description: 'Something PATCH success count',
content: {'application/json': {schema: CountSchema}},
},
},
})
async updateAll(
@requestBody({
content: {
'application/json': {
schema: getModelSchemaRef(Something, {partial: true}),
},
},
})
something: Something,
@param.where(Something) where?: Where<Something>,
): Promise<Count> {
return this.somethingRepository.updateAll(something, where);
}
就是这样。您可以从 GraphQL Playground 对其进行测试并试用订阅。
目前,我可以定义 customResolvers
和 customSubscriptionResolvers
,但我很确定我可以从控制器自动化这两个对象。
干杯!
根据标题,我在尝试在我的环回 4 应用程序中启用 graphql 订阅时遇到问题。
这是我到目前为止完成的代码。
index.ts
export async function main(options: ApplicationConfig = {}) {
const app = new BackendLb4Application(options)
await app.boot()
await app.start()
const url = app.restServer.url;
const oas: Oas3 = <Oas3><unknown>await app.restServer.getApiSpec()
const {schema} = await createGraphQLSchema(oas, {
operationIdFieldNames: true,
baseUrl: url,
createSubscriptionsFromCallbacks: true,
})
const handler = graphqlHTTP( (request:any, response:any, graphQLParams: any) => ({
schema,
pretty: true,
graphiql: true
}))
app.mountExpressRouter(graphqlPath, handler);
const pubsub = new PubSub()
const ws = createServer(app);
ws.listen(PORT, () => {
new SubscriptionServer(
{
execute,
subscribe,
schema,
onConnect: (params: any, socket: any, ctx: any) => {
console.log(params, 'here on onconnect')
// Add pubsub to context to be used by GraphQL subscribe field
return { pubsub }
}
},
{
server: ws,
path: '/subscriptions'
}
)
})
return app
}
这是我的架构
type Subscription {
"""
Equivalent to PATCH onNotificationUpdate
"""
postRequestQueryCallbackUrlApiNotification(secondInputInput: SecondInputInput): String
"""
Equivalent to PATCH onNotificationUpdate
"""
postRequestQueryCallbackUrlOnNotificationUpdate(firstInputInput: FirstInputInput): String
}
这是我的控制器的例子
@patch('/notification-update', {
operationId: 'notificationUpdate',
description: '**GraphQL notificationUpdate**',
callbacks:[ {
onNotificationUpdate: {
//'{$request.query.callbackUrl}/onNotificationUpdate': {
post: {
requestBody: {
operationId: 'notificationUpdateCallback',
description: 'rasjad',
content: {
'application/json': {
schema: {
title: "firstInput",
type: 'object',
properties: {
userData: {
type: "string"
}
}
}
}
}
},
responses: {
'200': {
description: 'response to subscription',
}
}
}
},
// }
}],
responses: {
'200': {
description: 'Notification PATCH success count',
content: {'application/json': {schema: CountSchema}},
},
},
})
async updateAll(
@requestBody({
content: {
'application/json': {
schema: getModelSchemaRef(Notification, {partial: true}),
},
},
})
notification: Notification,
@param.where(Notification) where?: Where<Notification>,
): Promise<Count> {
return this.notificationRepository.update(notification, where);
}
我已经在我的控制器中定义了回调 object,然后它将在我的模式中创建一个订阅。在 graphiql 上进行了测试,但没有成功。
我不知道从这里到哪里去。我需要自定义解析器还是什么?不确定。 如果有人可以提供帮助,我们将不胜感激。
以防万一其他人也想做同样的事情。
我用 Apollo Server 切换 graphqlHTTP
来创建我的 graphql 服务器。
所以我的最终 index.ts
看起来像这样。
export async function main(options: ApplicationConfig = {}) {
const lb4Application = new BackendLb4Application(options)
await lb4Application.boot()
await lb4Application.migrateSchema()
await lb4Application.start()
const url = lb4Application.restServer.url;
const graphqlPath = '/graphql'
// Get the OpenApiSpec
const oas: Oas3 = <Oas3><unknown>await lb4Application.restServer.getApiSpec()
// Create GraphQl Schema from OpenApiSpec
const {schema} = await createGraphQLSchema(oas, {
strict: false,
viewer: true,
baseUrl: url,
headers: {
'X-Origin': 'GraphQL'
},
createSubscriptionsFromCallbacks: true,
customResolvers: {
"lb4-title": {
"your-path":{
patch: (obj, args, context, info) => {
const num = Math.floor(Math.random() * 10);
pubsub.publish("something", { yourMethodName: {count: num} }).catch((err: any) => {
console.log(err)
})
return {count: 1}
}
}
}
},
customSubscriptionResolvers: {
"lb4-title" : {
"yourMethodName": {
post: {
subscribe: () => pubsub.asyncIterator("something"),
resolve: (obj: any, args: any, context, info) => {
console.log(obj, 'obj')
}
}
}
}
}
})
const app = express();
const server = new ApolloServer({
schema,
plugins: [{
async serverWillStart() {
return {
async drainServer() {
subscriptionServers.close();
}
};
}
}],
})
const subscriptionServers = SubscriptionServer.create(
{
// This is the `schema` we just created.
schema,
// These are imported from `graphql`.
execute,
subscribe,
},
{
server: lb4Application.restServer.httpServer?.server,
path: server.graphqlPath,
//path: server.graphqlPath,
}
);
await server.start();
server.applyMiddleware({ app, path: "/" });
lb4Application.mountExpressRouter('/graphql', app);
return lb4Application
}
您还需要像这样在控制器中定义 callbacks
对象。
@patch('/something-update', {
operationId: 'somethingUpdate',
description: '**GraphQL somethingUpdate**',
callbacks:[
{
yourMethodName: {
post: {
responses: {
'200': {
description: 'response to subscription',
content: {'application/json': {schema: CountSchema}},
}
}
}
},
}
],
responses: {
'200': {
description: 'Something PATCH success count',
content: {'application/json': {schema: CountSchema}},
},
},
})
async updateAll(
@requestBody({
content: {
'application/json': {
schema: getModelSchemaRef(Something, {partial: true}),
},
},
})
something: Something,
@param.where(Something) where?: Where<Something>,
): Promise<Count> {
return this.somethingRepository.updateAll(something, where);
}
就是这样。您可以从 GraphQL Playground 对其进行测试并试用订阅。
目前,我可以定义 customResolvers
和 customSubscriptionResolvers
,但我很确定我可以从控制器自动化这两个对象。
干杯!