{"id":47463,"date":"2023-10-30T00:14:25","date_gmt":"2023-06-09T16:05:56","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90graphql%e3%80%91%e4%bd%bf%e7%94%a8apolloserver-v4%e5%ae%9e%e7%8e%b0subscription%e7%9a%84%e6%96%b9%e6%b3%95%e3%80%82\/"},"modified":"2024-05-04T06:37:54","modified_gmt":"2024-05-03T22:37:54","slug":"%e3%80%90graphql%e3%80%91%e4%bd%bf%e7%94%a8apolloserver-v4%e5%ae%9e%e7%8e%b0subscription%e7%9a%84%e6%96%b9%e6%b3%95%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90graphql%e3%80%91%e4%bd%bf%e7%94%a8apolloserver-v4%e5%ae%9e%e7%8e%b0subscription%e7%9a%84%e6%96%b9%e6%b3%95%e3%80%82\/","title":{"rendered":"\u3010GraphQL\u3011\u4f7f\u7528ApolloServer v4\u5b9e\u73b0Subscription\u7684\u65b9\u6cd5"},"content":{"rendered":"

\u9996\u5148\uff0c
\n\u5728\u672c\u6b21\u5b9e\u73b0\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86GraphQL\u548cApolloServer v4\u6765\u8fdb\u884cSubscription\u7684\u529f\u80fd\u5f00\u53d1\u3002
\n\uff08\u7531\u4e8ev4\u7248\u672c\u4e0a\u7684\u8d44\u6599\u6bd4\u8f83\u5c11\uff0c\u6240\u4ee5\u6709\u4e9b\u56f0\u96be…\uff09<\/p>\n

\u6211\u6253\u7b97\u628a\u5b83\u4f5c\u4e3a\u5907\u5fd8\u5f55\u4fdd\u5b58\u4e0b\u6765\u3002<\/p>\n

\u8ba2\u9605\u662f\u6307<\/h1>\n

\u9996\u5148\uff0c\u7b80\u5355\u6765\u8bf4\uff0cSubscription\u6307\u7684\u662f\u5f53\u670d\u52a1\u5668\u53d1\u751f\u6ce8\u518c\u6216\u66f4\u65b0\u7b49\u4e8b\u4ef6\u65f6\uff0c\u53ef\u4ee5\u7acb\u5373\u66f4\u65b0\uff08\u53cd\u6620\uff09\u6570\u636e\u7684\u529f\u80fd\u3002\u8fd9\u662fApollo Server\u53ef\u4ee5\u786e\u4fdd\u7ed3\u679c\u4e00\u81f4\u6027\u7684\u7279\u6027\u3002<\/p>\n

\u8fd9\u662f\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u73b0\u5b9e\u8ba2\u9605\u7684\u5b9a\u671f\u8d2d\u4e70\uff0c\u53ef\u4ee5\u901a\u8fc7\u5c06\u6570\u636e\u63a8\u9001\u7ed9\u5df2\u5728\u670d\u52a1\u5668\u4e0a\u6ce8\u518c\u8ba2\u9605\u7684\u5ba2\u6237\u7aef\u6765\u5373\u65f6\u66f4\u65b0\u6570\u636e\u3002\uff08\u5982\u679c\u770b\u5b9e\u9645\u7684\u4ee3\u7801\uff0c\u5e94\u8be5\u4f1a\u66f4\u597d\u7406\u89e3\uff09<\/p>\n

\u5f15\u5165\u56fe\u4e66\u9986\u3002<\/h1>\n

\u8bf7\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u6765\u5b89\u88c5\u6240\u9700\u7684\u5e93\u3002<\/p>\n

yarn add graphql-ws ws @types\/ws @graphql-tools\/schema graphql-subscriptions cors @types\/cors express \r\n<\/span><\/code><\/pre>\n
\u6fc0\u6d3b\u8ba2\u9605<\/h1>\n
\u9996\u5148\uff0c\u6211\u4eec\u5c06\u521b\u5efaHTTP\u670d\u52a1\u5668\u3001WebSocket\u670d\u52a1\u5668\u548cApolloServer\u6765\u5904\u7406\u8ba2\u9605\u3002 \uff08\u7531\u4e8e\u8fd9\u4e9b\u5185\u5bb9\u662f\u56fa\u5b9a\u7684\uff0c\u56e0\u6b64\u6700\u597d\u6309\u7167\u5b98\u65b9\u6587\u6863\u8fdb\u884c\u64cd\u4f5c\uff09<\/p>\n
\u9996\u5148\u662f\u5b8c\u6210\u7248\u672c\u7684\u4ee3\u7801\u3002<\/p>\n
import<\/span> '<\/span>dotenv\/config<\/span>'<\/span>\r\n\r\nimport<\/span> {<\/span> ApolloServer<\/span> }<\/span> from<\/span> '<\/span>@apollo\/server<\/span>'<\/span>\r\nimport<\/span> {<\/span> expressMiddleware<\/span> }<\/span> from<\/span> '<\/span>@apollo\/server\/express4<\/span>'<\/span>\r\nimport<\/span> {<\/span> ApolloServerPluginDrainHttpServer<\/span> }<\/span> from<\/span> '<\/span>@apollo\/server\/plugin\/drainHttpServer<\/span>'<\/span>\r\nimport<\/span> {<\/span> GraphQLFileLoader<\/span> }<\/span> from<\/span> '<\/span>@graphql-tools\/graphql-file-loader<\/span>'<\/span>\r\nimport<\/span> {<\/span> loadSchemaSync<\/span> }<\/span> from<\/span> '<\/span>@graphql-tools\/load<\/span>'<\/span>\r\nimport<\/span> {<\/span> addResolversToSchema<\/span> }<\/span> from<\/span> '<\/span>@graphql-tools\/schema<\/span>'<\/span>\r\nimport<\/span> {<\/span> PrismaClient<\/span> }<\/span> from<\/span> '<\/span>@prisma\/client<\/span>'<\/span>\r\nimport<\/span> bodyParser<\/span> from<\/span> '<\/span>body-parser<\/span>'<\/span>\r\nimport<\/span> cors<\/span> from<\/span> '<\/span>cors<\/span>'<\/span>\r\nimport<\/span> express<\/span> from<\/span> '<\/span>express<\/span>'<\/span>\r\nimport<\/span> {<\/span> PubSub<\/span> }<\/span> from<\/span> '<\/span>graphql-subscriptions<\/span>'<\/span>\r\nimport<\/span> {<\/span> useServer<\/span> }<\/span> from<\/span> '<\/span>graphql-ws\/lib\/use\/ws<\/span>'<\/span>\r\nimport<\/span> {<\/span> createServer<\/span> }<\/span> from<\/span> '<\/span>http<\/span>'<\/span>\r\nimport<\/span> {<\/span> join<\/span> }<\/span> from<\/span> '<\/span>path<\/span>'<\/span>\r\nimport<\/span> {<\/span> WebSocketServer<\/span> }<\/span> from<\/span> '<\/span>ws<\/span>'<\/span>\r\n\r\nimport<\/span> {<\/span> user<\/span> }<\/span> from<\/span> '<\/span>.\/resolvers\/Link<\/span>'<\/span>\r\nimport<\/span> {<\/span> login<\/span>,<\/span> post<\/span>,<\/span> singUp<\/span> }<\/span> from<\/span> '<\/span>.\/resolvers\/Mutation<\/span>'<\/span>\r\nimport<\/span> {<\/span> feed<\/span> }<\/span> from<\/span> '<\/span>.\/resolvers\/Query<\/span>'<\/span>\r\nimport<\/span> {<\/span> links<\/span> }<\/span> from<\/span> '<\/span>.\/resolvers\/User<\/span>'<\/span>\r\nimport<\/span> type<\/span> {<\/span> Context<\/span> }<\/span> from<\/span> '<\/span>.\/types\/Context<\/span>'<\/span>\r\nimport<\/span> {<\/span> getUserId<\/span> }<\/span> from<\/span> '<\/span>.\/utils<\/span>'<\/span>\r\n\r\nconst<\/span> PORT<\/span> =<\/span> 4000<\/span>\r\nconst<\/span> pubsub<\/span> =<\/span> new<\/span> PubSub<\/span>()<\/span>\r\n\r\nconst<\/span> prisma<\/span> =<\/span> new<\/span> PrismaClient<\/span>()<\/span>\r\n\r\nconst<\/span> app<\/span> =<\/span> express<\/span>()<\/span>\r\n\r\nconst<\/span> schema<\/span> =<\/span> loadSchemaSync<\/span>(<\/span>join<\/span>(<\/span>__dirname<\/span>,<\/span> '<\/span>.\/schema.graphql<\/span>'<\/span>),<\/span> {<\/span>\r\n  loaders<\/span>:<\/span> [<\/span>new<\/span> GraphQLFileLoader<\/span>()],<\/span>\r\n})<\/span>\r\n\r\n\/\/ \u30ea\u30be\u30eb\u30d0\u30fc\u95a2\u6570<\/span>\r\nconst<\/span> resolvers<\/span> =<\/span> {<\/span>\r\n  Query<\/span>:<\/span> {<\/span>\r\n    feed<\/span>:<\/span> feed<\/span>,<\/span>\r\n  },<\/span>\r\n\r\n  Mutation<\/span>:<\/span> {<\/span>\r\n    signUp<\/span>:<\/span> singUp<\/span>,<\/span>\r\n    login<\/span>:<\/span> login<\/span>,<\/span>\r\n    post<\/span>:<\/span> post<\/span>,<\/span>\r\n  },<\/span>\r\n\r\n  Subscription<\/span>:<\/span> {<\/span>\r\n    newLink<\/span>:<\/span> {<\/span>\r\n      subscribe<\/span>:<\/span> ()<\/span> =><\/span> pubsub<\/span>.<\/span>asyncIterator<\/span>(<\/span>'<\/span>NEW_LINK<\/span>'<\/span>),<\/span>\r\n    },<\/span>\r\n  },<\/span>\r\n\r\n  Link<\/span>:<\/span> {<\/span>\r\n    user<\/span>:<\/span> user<\/span>,<\/span>\r\n  },<\/span>\r\n\r\n  User<\/span>:<\/span> {<\/span>\r\n    links<\/span>:<\/span> links<\/span>,<\/span>\r\n  },<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> schemaWithResolvers<\/span> =<\/span> addResolversToSchema<\/span>({<\/span> schema<\/span>,<\/span> resolvers<\/span> })<\/span>\r\n\r\nconst<\/span> httpServer<\/span> =<\/span> createServer<\/span>(<\/span>app<\/span>)<\/span>\r\n\r\nconst<\/span> wsServer<\/span> =<\/span> new<\/span> WebSocketServer<\/span>({<\/span>\r\n  server<\/span>:<\/span> httpServer<\/span>,<\/span>\r\n  path<\/span>:<\/span> '<\/span>\/graphql<\/span>'<\/span>,<\/span>\r\n})<\/span>\r\n\r\nconst<\/span> serverCleanup<\/span> =<\/span> useServer<\/span>({<\/span> schema<\/span>:<\/span> schemaWithResolvers<\/span> },<\/span> wsServer<\/span>)<\/span>\r\n\r\nconst<\/span> server<\/span> =<\/span> new<\/span> ApolloServer<\/span><<\/span>Context<\/span>><\/span>({<\/span>\r\n  schema<\/span>:<\/span> schemaWithResolvers<\/span>,<\/span>\r\n  plugins<\/span>:<\/span> [<\/span>\r\n    ApolloServerPluginDrainHttpServer<\/span>({<\/span> httpServer<\/span> }),<\/span>\r\n\r\n    {<\/span>\r\n      async<\/span> serverWillStart<\/span>()<\/span> {<\/span>\r\n        return<\/span> {<\/span>\r\n          async<\/span> drainServer<\/span>()<\/span> {<\/span>\r\n            await<\/span> serverCleanup<\/span>.<\/span>dispose<\/span>()<\/span>\r\n          },<\/span>\r\n        }<\/span>\r\n      },<\/span>\r\n    },<\/span>\r\n  ],<\/span>\r\n})<\/span>\r\n\r\n;(<\/span>async <\/span>()<\/span> =><\/span> {<\/span>\r\n  try<\/span> {<\/span>\r\n    await<\/span> server<\/span>.<\/span>start<\/span>()<\/span>\r\n\r\n    app<\/span>.<\/span>use<\/span>(<\/span>\r\n      '<\/span>\/graphql<\/span>'<\/span>,<\/span>\r\n      cors<\/span><<\/span>cors<\/span>.<\/span>CorsRequest<\/span>><\/span>(),<\/span>\r\n      bodyParser<\/span>.<\/span>json<\/span>(),<\/span>\r\n      expressMiddleware<\/span>(<\/span>server<\/span>,<\/span> {<\/span>\r\n        context<\/span>:<\/span> async <\/span>({<\/span> req<\/span> })<\/span> =><\/span> ({<\/span>\r\n          ...<\/span>req<\/span>,<\/span>\r\n          prisma<\/span>,<\/span>\r\n          pubsub<\/span>,<\/span>\r\n          userId<\/span>:<\/span> req<\/span> &&<\/span> req<\/span>.<\/span>headers<\/span>.<\/span>authorization<\/span> ?<\/span> getUserId<\/span>(<\/span>req<\/span>)<\/span> :<\/span> undefined<\/span>,<\/span>\r\n        }),<\/span>\r\n      })<\/span>\r\n    )<\/span>\r\n\r\n    httpServer<\/span>.<\/span>listen<\/span>(<\/span>PORT<\/span>,<\/span> ()<\/span> =><\/span> {<\/span>\r\n      console<\/span>.<\/span>log<\/span>(<\/span>`? Query endpoint ready at http:\/\/localhost:<\/span>${<\/span>PORT<\/span>}<\/span>\/graphql`<\/span>)<\/span>\r\n      console<\/span>.<\/span>log<\/span>(<\/span>\r\n        `? Subscription endpoint ready at ws:\/\/localhost:<\/span>${<\/span>PORT<\/span>}<\/span>\/graphql`<\/span>\r\n      )<\/span>\r\n    })<\/span>\r\n  }<\/span> catch <\/span>(<\/span>error<\/span>)<\/span> {<\/span>\r\n    console<\/span>.<\/span>error<\/span>(<\/span>'<\/span>Error starting server: <\/span>'<\/span>,<\/span> error<\/span>)<\/span>\r\n  }<\/span>\r\n})()<\/span>\r\n<\/code><\/pre>\n
\u6211\u5011\u5c07\u6309\u7167\u9806\u5e8f\u4f5c\u51fa\u89e3\u91cb\u3002<\/p>\n
GraphQL\u7684Schema\u548cResolver\u7684\u5b9a\u4e49<\/h2>\n
const<\/span> PORT<\/span> =<\/span> 4000<\/span>\r\nconst<\/span> pubsub<\/span> =<\/span> new<\/span> PubSub<\/span>()<\/span>\r\n\r\nconst<\/span> prisma<\/span> =<\/span> new<\/span> PrismaClient<\/span>()<\/span>\r\n\r\nconst<\/span> app<\/span> =<\/span> express<\/span>()<\/span>\r\n\r\nconst<\/span> schema<\/span> =<\/span> loadSchemaSync<\/span>(<\/span>join<\/span>(<\/span>__dirname<\/span>,<\/span> '<\/span>.\/schema.graphql<\/span>'<\/span>),<\/span> {<\/span>\r\n  loaders<\/span>:<\/span> [<\/span>new<\/span> GraphQLFileLoader<\/span>()],<\/span>\r\n})<\/span>\r\n\r\n\/\/ \u30ea\u30be\u30eb\u30d0\u30fc\u95a2\u6570<\/span>\r\nconst<\/span> resolvers<\/span> =<\/span> {<\/span>\r\n  Query<\/span>:<\/span> {<\/span>\r\n    feed<\/span>:<\/span> feed<\/span>,<\/span>\r\n  },<\/span>\r\n\r\n  Mutation<\/span>:<\/span> {<\/span>\r\n    signUp<\/span>:<\/span> singUp<\/span>,<\/span>\r\n    login<\/span>:<\/span> login<\/span>,<\/span>\r\n    post<\/span>:<\/span> post<\/span>,<\/span>\r\n  },<\/span>\r\n\r\n  Subscription<\/span>:<\/span> {<\/span>\r\n    newLink<\/span>:<\/span> {<\/span>\r\n      subscribe<\/span>:<\/span> ()<\/span> =><\/span> pubsub<\/span>.<\/span>asyncIterator<\/span>(<\/span>'<\/span>NEW_LINK<\/span>'<\/span>),<\/span>\r\n    },<\/span>\r\n  },<\/span>\r\n\r\n  Link<\/span>:<\/span> {<\/span>\r\n    user<\/span>:<\/span> user<\/span>,<\/span>\r\n  },<\/span>\r\n\r\n  User<\/span>:<\/span> {<\/span>\r\n    links<\/span>:<\/span> links<\/span>,<\/span>\r\n  },<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7531\u4e8ePubSub\u5b9e\u4f8b\u5c06\u5728\u540e\u6587\u8fdb\u884c\u89e3\u91ca\uff0c\u56e0\u6b64\u5728\u8fd9\u91cc\u7701\u7565\u4e0d\u63d0\u3002<\/p>\n
\u8fd9\u90e8\u5206\u662f\u5728\u5904\u7406express\u7684\u5b58\u50a8\u548c\u6a21\u5f0f\u89e3\u6790\u5668\u7684\u5b9a\u4e49\uff0c\u8fd9\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5904\u7406\u65b9\u5f0f\u3002<\/p>\n
\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u4ee5\u4e0b\u662f\u6a21\u5f0f\u7ed3\u6784\u3002<\/p>\n
type<\/span> Query<\/span> {<\/span>\r\n  feed<\/span>:<\/span> [<\/span>Link<\/span>]!<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> Mutation<\/span> {<\/span>\r\n  post<\/span>(<\/span>url<\/span>:<\/span> String<\/span>!,<\/span> description<\/span>:<\/span> String<\/span>!):<\/span> Link<\/span>!<\/span>\r\n  signUp<\/span>(<\/span>email<\/span>:<\/span> String<\/span>!,<\/span> password<\/span>:<\/span> String<\/span>!,<\/span> name<\/span>:<\/span> String<\/span>!):<\/span> AuthPayload<\/span>\r\n  login<\/span>(<\/span>email<\/span>:<\/span> String<\/span>!,<\/span> password<\/span>:<\/span> String<\/span>!):<\/span> AuthPayload<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> Subscription<\/span> {<\/span>\r\n  newLink<\/span>:<\/span> Link<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> Link<\/span> {<\/span>\r\n  id<\/span>:<\/span> ID<\/span>!<\/span>\r\n  description<\/span>:<\/span> String<\/span>!<\/span>\r\n  url<\/span>:<\/span> String<\/span>!<\/span>\r\n  user<\/span>:<\/span> User<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> User<\/span> {<\/span>\r\n  id<\/span>:<\/span> ID<\/span>!<\/span>\r\n  name<\/span>:<\/span> String<\/span>!<\/span>\r\n  email<\/span>:<\/span> String<\/span>!<\/span>\r\n  links<\/span>:<\/span> [<\/span>Link<\/span>!]!<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> AuthPayload<\/span> {<\/span>\r\n  token<\/span>:<\/span> String<\/span>\r\n  user<\/span>:<\/span> User<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5728\u6a21\u5f0f\u4e2d\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e2aSubscription\u7684newLink\u88ab\u8fd4\u56de\u4e3aLink\u7c7b\u578b\u3002<\/p>\n
\u5173\u4e8e\u8ba2\u9605\u5904\u7406\u7684\u8be6\u7ec6\u8bf4\u660e\u7a0d\u540e\u4f1a\u63d0\u4f9b\u3002<\/p>\n
\u521b\u5efa\u4e00\u4e2aWebSocket\u670d\u52a1\u5668\u7684HTTP\u670d\u52a1\u5668<\/h2>\n
\u9019\u662f\u7a0b\u5f0f\u78bc\u3002<\/p>\n
const<\/span> schemaWithResolvers<\/span> =<\/span> addResolversToSchema<\/span>({<\/span> schema<\/span>,<\/span> resolvers<\/span> })<\/span>\r\n\r\nconst<\/span> httpServer<\/span> =<\/span> createServer<\/span>(<\/span>app<\/span>)<\/span>\r\n\r\nconst<\/span> wsServer<\/span> =<\/span> new<\/span> WebSocketServer<\/span>({<\/span>\r\n  server<\/span>:<\/span> httpServer<\/span>,<\/span>\r\n  path<\/span>:<\/span> '<\/span>\/graphql<\/span>'<\/span>,<\/span>\r\n})<\/span>\r\n\r\nconst<\/span> serverCleanup<\/span> =<\/span> useServer<\/span>({<\/span> schema<\/span>:<\/span> schemaWithResolvers<\/span> },<\/span> wsServer<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u9996\u5148\uff0c\u6709\u4e00\u4e2a\u4e0e\u5b98\u65b9\u4e0d\u540c\u7684\u5730\u65b9\u3002\u5c31\u662f\u4e0b\u9762\u8fd9\u4e2a\u90e8\u5206\u3002
\n\u5b98\u65b9\u7684\u4ee3\u7801\u4e2d\uff0cschemaWithResolvers\u90e8\u5206\u662f\u8fd9\u6837\u7684\u3002<\/p>\n
const<\/span> schema<\/span> =<\/span> makeExecutableSchema<\/span>({<\/span> typeDefs<\/span>,<\/span> resolvers<\/span> });<\/span>\r\n<\/code><\/pre>\n
\u56e0\u4e3a\u6211\u5728\u4f7f\u7528\u5916\u90e8\u6587\u4ef6\u7684\u6a21\u5f0f\uff0c\u6240\u4ee5\u6211\u4f7f\u7528\u4e86addResolversToSchema\u8fd9\u4e2a\u51fd\u6570\u3002<\/p>\n
\u5728\u8fd9\u91cc\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u80fd\u591f\u5c06\u6a21\u5f0f\uff08Schema\uff09\u548c\u89e3\u6790\u5668\uff08Resolver\uff09\u4e00\u8d77\u63d0\u4f9b\u3002<\/p>\n
\u4e0b\u4e00\u6b65\uff0c\u901a\u8fc7createServer\u65b9\u6cd5\u521b\u5efaHTTP\u670d\u52a1\u5668\u3002
\n\u5728\u8fd9\u91cc\u5c06app\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u5e76\u4f7fExpress\u5728HTTP\u670d\u52a1\u5668\u4e0a\u542f\u52a8\u3002<\/p>\n
\u63a5\u4e0b\u6765\u662fWebSocket\u670d\u52a1\u5668\uff0cWebSocket\u670d\u52a1\u5668\u53ef\u4ee5\u7528\u4f5c\u8ba2\u9605\u670d\u52a1\u5668\u3002\u6b64\u5916\uff0c\u901a\u8fc7\u6307\u5b9ahttpServer\u5230\u670d\u52a1\u5668\uff0c\u53ef\u4ee5\u5728\u4e0eHTTP\u670d\u52a1\u5668\u76f8\u540c\u7684\u7f51\u7edc\u7aef\u53e3\u4e0a\u542f\u52a8WebSocket\u670d\u52a1\u5668\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u8fd9\u610f\u5473\u7740\u53ef\u4ee5\u4e0eHTTP\u670d\u52a1\u5668\u5171\u5b58\u3002<\/p>\n
\u9664\u6b64\u4e4b\u5916\uff0c\u4e3a\u4e86\u4e0eHTTP\u670d\u52a1\u5668\u7684\u540c\u4e00\u7aef\u70b9\u5339\u914d\uff0c\u5c06\u8def\u5f84\u4f20\u9012\u5230`\/graphql`\uff0c\u5e76\u8fdb\u884c\u521b\u5efa\u3002<\/p>\n
\u4f7f\u7528 useServer \u53ef\u4ee5\u901a\u8fc7 WebSocket \u5904\u7406 GraphQL \u7684 Subscription\u3002<\/p>\n
\u521b\u5efa\u4e00\u4e2a Apollo Server<\/h2>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u542f\u52a8Apollo Server\u3002<\/p>\n
const<\/span> server<\/span> =<\/span> new<\/span> ApolloServer<\/span><<\/span>Context<\/span>><\/span>({<\/span>\r\n  schema<\/span>:<\/span> schemaWithResolvers<\/span>,<\/span>\r\n  plugins<\/span>:<\/span> [<\/span>\r\n    ApolloServerPluginDrainHttpServer<\/span>({<\/span> httpServer<\/span> }),<\/span>\r\n\r\n    {<\/span>\r\n      async<\/span> serverWillStart<\/span>()<\/span> {<\/span>\r\n        return<\/span> {<\/span>\r\n          async<\/span> drainServer<\/span>()<\/span> {<\/span>\r\n            await<\/span> serverCleanup<\/span>.<\/span>dispose<\/span>()<\/span>\r\n          },<\/span>\r\n        }<\/span>\r\n      },<\/span>\r\n    },<\/span>\r\n  ],<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u4f20\u9012\u4e86GraphQL\u6a21\u5f0f\u548c\u89e3\u6790\u5668\u3002
\n\u91cd\u8981\u7684\u662f\u63d2\u4ef6\u3002
\n\u63d2\u4ef6\u53ef\u7528\u4e8e\u81ea\u5b9a\u4e49Apollo Server\u7684\u529f\u80fd\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5173\u95ed\u4e86HTTP\u670d\u52a1\u5668\u548cWebSocket\u670d\u52a1\u5668\uff0c\u4ee5\u4fbf\u542f\u52a8Apollo Server\u3002<\/p>\n
ApolloServerPluginDrainHttpServer\u662f\u4e00\u4e2a\u63d2\u4ef6\uff0c\u7528\u4e8e\u5728HTTP\u670d\u52a1\u5668\u5173\u95ed\u65f6\u7b49\u5f85\u8fdb\u884c\u4e2d\u7684\u8bf7\u6c42\u5b8c\u6210\u3002<\/p>\n
\u5728serverWillStart\u4e2d\uff0c\u60a8\u53ef\u4ee5\u5b9a\u4e49\u5728\u670d\u52a1\u5668\u542f\u52a8\u4e4b\u524d\u8981\u6267\u884c\u7684\u903b\u8f91\u3002\u53e6\u5916\uff0c\u5728drainServer\u4e2d\uff0c\u6211\u4eec\u8c03\u7528\u4e86serverClenaup.dispose()\uff0c\u4ee5\u786e\u4fdd\u5728\u670d\u52a1\u5668\u5173\u95ed\u65f6\u8fdb\u884c\u6e05\u7406\u5904\u7406\u3002<\/p>\n
\u542f\u52a8HTTP\u670d\u52a1\u5668<\/h2>\n
;(<\/span>async <\/span>()<\/span> =><\/span> {<\/span>\r\n  try<\/span> {<\/span>\r\n    await<\/span> server<\/span>.<\/span>start<\/span>()<\/span>\r\n\r\n    app<\/span>.<\/span>use<\/span>(<\/span>\r\n      '<\/span>\/graphql<\/span>'<\/span>,<\/span>\r\n      cors<\/span><<\/span>cors<\/span>.<\/span>CorsRequest<\/span>><\/span>(),<\/span>\r\n      bodyParser<\/span>.<\/span>json<\/span>(),<\/span>\r\n      expressMiddleware<\/span>(<\/span>server<\/span>,<\/span> {<\/span>\r\n        context<\/span>:<\/span> async <\/span>({<\/span> req<\/span> })<\/span> =><\/span> ({<\/span>\r\n          ...<\/span>req<\/span>,<\/span>\r\n          prisma<\/span>,<\/span>\r\n          pubsub<\/span>,<\/span>\r\n          userId<\/span>:<\/span> req<\/span> &&<\/span> req<\/span>.<\/span>headers<\/span>.<\/span>authorization<\/span> ?<\/span> getUserId<\/span>(<\/span>req<\/span>)<\/span> :<\/span> undefined<\/span>,<\/span>\r\n        }),<\/span>\r\n      })<\/span>\r\n    )<\/span>\r\n\r\n    httpServer<\/span>.<\/span>listen<\/span>(<\/span>PORT<\/span>,<\/span> ()<\/span> =><\/span> {<\/span>\r\n      console<\/span>.<\/span>log<\/span>(<\/span>`? Query endpoint ready at http:\/\/localhost:<\/span>${<\/span>PORT<\/span>}<\/span>\/graphql`<\/span>)<\/span>\r\n      console<\/span>.<\/span>log<\/span>(<\/span>\r\n        `? Subscription endpoint ready at ws:\/\/localhost:<\/span>${<\/span>PORT<\/span>}<\/span>\/graphql`<\/span>\r\n      )<\/span>\r\n    })<\/span>\r\n  }<\/span> catch <\/span>(<\/span>error<\/span>)<\/span> {<\/span>\r\n    console<\/span>.<\/span>error<\/span>(<\/span>'<\/span>Error starting server: <\/span>'<\/span>,<\/span> error<\/span>)<\/span>\r\n  }<\/span>\r\n})()<\/span>\r\n<\/code><\/pre>\n
\u9996\u5148\uff0c\u542f\u52a8Apollo Server\u3002
\n\u5728\u6b64\u671f\u95f4\uff0c\u4e3a\u4e86\u4e0d\u542f\u52a8HTTP\u670d\u52a1\u5668\u548cWebSocket\u670d\u52a1\u5668\uff0c\u6267\u884c\u5148\u524d\u5b9a\u4e49\u7684\u63d2\u4ef6\u5904\u7406\u3002<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5bf9HTTP\u670d\u52a1\u5668\u7684\u7aef\u70b9\u8fdb\u884c\u4e86CORS\u7684\u5b9a\u4e49\u3001JSON\u7684\u4f7f\u7528\u58f0\u660e\u4ee5\u53ca\u4e0a\u4e0b\u6587\u7684\u5b9a\u4e49\u3002<\/p>\n
Context\u662f\u6307\u5728\u6574\u4e2a\u8bf7\u6c42\u4e2d\u53ef\u4ee5\u5b9a\u4e49\u53ef\u7528\u7684\u503c\u3002\u4f8b\u5982\uff0c\u5728Mutation\u7b49\u64cd\u4f5c\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u5c06Context\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u5e76\u901a\u8fc7context.prisma\u83b7\u53d6\uff0c\u4ece\u800c\u6267\u884c\u8bf8\u5982context.prisma.create\u7b49\u6570\u636e\u5e93\u64cd\u4f5c\u3002<\/p>\n
\u5173\u4e8eContext\u7684\u8be6\u7ec6\u89e3\u91ca\uff0c\u8bf7\u53c2\u8003\u53e6\u4e00\u7bc7\u6587\u7ae0\u3002<\/p>\n
\u3010GraphQL\u3011\u4f7f\u7528Apollo Server v4\u548cPrisma\u5728\u4e0a\u4e0b\u6587\u4e2d\u5171\u4eab\u6570\u636e\u7684\u65b9\u6cd5<\/p><\/blockquote>\n
\u5b9e\u65bd\u8ba2\u9605\u5904\u7406\u7a0b\u5e8f<\/h1>\n
\u6700\u5f00\u59cb\u51fa\u73b0\u5728\u524d\u9762\uff0c\u4f46\u662f\u5728\u63a5\u4e0b\u6765\u7684\u90e8\u5206\u8fdb\u884c\u4e86\u5904\u7406\u3002<\/p>\n
Subscription<\/span>:<\/span> {<\/span>\r\n    newLink<\/span>:<\/span> {<\/span>\r\n      subscribe<\/span>:<\/span> ()<\/span> =><\/span> pubsub<\/span>.<\/span>asyncIterator<\/span>(<\/span>'<\/span>NEW_LINK<\/span>'<\/span>),<\/span>\r\n    },<\/span>\r\n  },<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u5c06\u89e6\u53d1\u5b57\u7b26\u4e32\u4f20\u9012\u7ed9PubSub\u5b9e\u4f8b\u7684asyncIterator\uff0c\u53ef\u4ee5\u5b9a\u4e49\u8ba2\u9605\u3002<\/p>\n
\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u8ba2\u9605\u8005\u3002
\n\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u6709\u6570\u636e\u6ce8\u518c\u6216\u66f4\u65b0\u7b49\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0c\u6211\u4eec\u4f1a\u5b9e\u65f6\u83b7\u53d6Link\u7c7b\u578b\u7684\u6570\u636e\u3002<\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u8fd9\u662f\u8ba2\u9605\u4e8b\u4ef6\u5904\u7406\u7684\u6267\u884c\u4ee3\u7801\u3002\u4e0b\u9762\u662fpost\u51fd\u6570\u3002<\/p>\n
export<\/span> const<\/span> post<\/span> =<\/span> async <\/span>(<\/span>\r\n  _<\/span>:<\/span> unknown<\/span>,<\/span>\r\n  args<\/span>:<\/span> {<\/span> description<\/span>:<\/span> string<\/span>;<\/span> url<\/span>:<\/span> string<\/span> },<\/span>\r\n  context<\/span>:<\/span> Context<\/span>\r\n)<\/span> =><\/span> {<\/span>\r\n  const<\/span> {<\/span> userId<\/span> }<\/span> =<\/span> context<\/span>\r\n\r\n  const<\/span> newLink<\/span> =<\/span> await<\/span> context<\/span>.<\/span>prisma<\/span>.<\/span>link<\/span>.<\/span>create<\/span>({<\/span>\r\n    data<\/span>:<\/span> {<\/span>\r\n      url<\/span>:<\/span> args<\/span>.<\/span>url<\/span>,<\/span>\r\n      description<\/span>:<\/span> args<\/span>.<\/span>description<\/span>,<\/span>\r\n      user<\/span>:<\/span> {<\/span> connect<\/span>:<\/span> {<\/span> id<\/span>:<\/span> userId<\/span> as<\/span> number<\/span> }<\/span> },<\/span>\r\n    },<\/span>\r\n  })<\/span>\r\n\r\n  \/\/ \u30b5\u30d6\u30b9\u30af\u30ea\u30d7\u30b7\u30e7\u30f3\u9001\u4fe1\uff08\u7b2c\u4e00\u5f15\u6570\uff1a\u30c8\u30ea\u30ac\u30fc\u540d \/ \u7b2c\u4e8c\u5f15\u6570\uff1a\u6e21\u3057\u305f\u3044\u5024\uff09<\/span>\r\n  context<\/span>.<\/span>pubsub<\/span>.<\/span>publish<\/span>(<\/span>'<\/span>NEW_LINK<\/span>'<\/span>,<\/span> {<\/span> newLink<\/span> })<\/span>\r\n\r\n  return<\/span> newLink<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u5c06\u89e6\u53d1\u5668\u540d\u8bbe\u4e3aNEW_LINK\u5e76\u8fdb\u884c\u53d1\u5e03\uff0cnewLink\u5bf9\u8c61\u5c06\u4f20\u9012\u7ed9\u5177\u6709NEW_LINK\u8ba2\u9605\u7684\u8ba2\u9605\u8005\uff0c\u5e76\u80fd\u591f\u5b9e\u65f6\u83b7\u53d6\u6570\u636e\u65f6\u523b\u5f53newLink\u88ab\u6ce8\u518c\u65f6\u3002\uff08\u53ef\u4ee5\u5c06\u5176\u7c7b\u6bd4\u4e3a\u5c06\u670d\u52a1\u4f20\u9012\u7ed9\u8ba2\u9605\u8005\u7684\u5e38\u89c1\u8ba2\u9605\u65b9\u5f0f\uff09<\/p>\n
context<\/span>.<\/span>pubsub<\/span>.<\/span>publish<\/span>(<\/span>'<\/span>NEW_LINK<\/span>'<\/span>,<\/span> {<\/span> newLink<\/span> })<\/span>\r\n<\/code><\/pre>\n
\u786e\u8ba4\u52a8\u4f5c<\/h2>\n
\"c0a7fa95ef8e4e59e66a56fea7923de4_AdobeExpress.gif\"<\/div>\n
\u8ba2\u9605\u529f\u80fd\u7684\u5b9e\u73b0\u5df2\u5b8c\u6210\u3002<\/p>\n
\u53c2\u8003\u6587\u732e – Reference materials<\/h1>\n
\u5728Apollo Server\u4e2d\u7684\u8ba2\u9605
\nAPI\u53c2\u8003\uff1aexpressMiddleware
\n\u4f7f\u7528Apollo Server V4\u7684\u8ba2\u9605\u548cGraphQL\u6784\u5efa\u4e00\u4e2a\u5b9e\u65f6\u65b0\u95fbAPI\uff08TypeScript\u6559\u7a0b\uff09<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"
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