{"id":47716,"date":"2022-11-23T23:58:46","date_gmt":"2023-01-06T18:51:57","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e4%bd%bf%e7%94%a8next-jsurql%e7%8e%af%e5%a2%83%e6%97%b6%ef%bc%8c%e4%bd%bf%e7%94%a8postgresql%e7%9a%84pub-sub%e6%9d%a5%e8%bf%9b%e8%a1%8cgraphql%e8%ae%a2%e9%98%85%e3%80%82\/"},"modified":"2024-01-15T12:24:41","modified_gmt":"2024-01-15T04:24:41","slug":"%e5%9c%a8%e4%bd%bf%e7%94%a8next-jsurql%e7%8e%af%e5%a2%83%e6%97%b6%ef%bc%8c%e4%bd%bf%e7%94%a8postgresql%e7%9a%84pub-sub%e6%9d%a5%e8%bf%9b%e8%a1%8cgraphql%e8%ae%a2%e9%98%85%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e4%bd%bf%e7%94%a8next-jsurql%e7%8e%af%e5%a2%83%e6%97%b6%ef%bc%8c%e4%bd%bf%e7%94%a8postgresql%e7%9a%84pub-sub%e6%9d%a5%e8%bf%9b%e8%a1%8cgraphql%e8%ae%a2%e9%98%85%e3%80%82\/","title":{"rendered":"\u5728\u4f7f\u7528Next.js+URQL\u73af\u5883\u65f6\uff0c\u4f7f\u7528PostgreSQL\u7684Pub\/Sub\u6765\u8fdb\u884cGraphQL\u8ba2\u9605"},"content":{"rendered":"

\u6211\u5728\u682a\u5f0f\u4f1a\u793emofmof\u5de5\u4f5c\u7684shwld\uff0c\u4f7f\u7528Next.js + \u670d\u52a1\u5668\u7aefTypeScript + \u51fd\u6570\u65b9\u5f0f\u521b\u5efa\u4e86\u4e00\u4e2a\u6e05\u6d01\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u8fd9\u7bc7\u6587\u7ae0\u662f2022\u5e74\u7684Advent Calendar\u7684\u7b2c21\u5929\uff0c\u6211\u5c06\u4ecb\u7ecd\u5b9e\u73b0\u610f\u56fe\u7b49\u5185\u5bb9\u3002<\/p>\n

\u6211\u4e4b\u524d\u5199\u8fc7\u5173\u4e8e\u5982\u4f55\u5728Mailgun\u4e0a\u5b9e\u73b0\u90ae\u4ef6\u53d1\u9001\u529f\u80fd\u7684\u6587\u7ae0\u3002<\/p>\n

\u4f7f\u7528Next.js\u6784\u5efaGraphQL Subscription\u73af\u5883\u3002<\/h1>\n

\u5ba2\u6237\u7aef\uff08next-urql\uff09<\/h2>\n
withUrqlClient<\/span>((<\/span>_ssrExchange<\/span>,<\/span> _ctx<\/span>)<\/span> =><\/span> ({<\/span>\r\n  url<\/span>:<\/span> `<\/span>${<\/span>API_HOST<\/span>}<\/span>\/api\/graphql`<\/span>,<\/span>\r\n  exchanges<\/span>:<\/span> [<\/span>\r\n    dedupExchange<\/span>,<\/span>\r\n    cache<\/span>,<\/span>\r\n    fetchExchange<\/span>,<\/span>\r\n    yogaExchange<\/span>(),<\/span>\r\n  ],<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n
\u539f\u59cb\u6765\u6e90\uff1a\/apps\/web\/src\/graphql\/withGraphQLClient.tsx<\/p>\n
\u4e2d\u6587\u91ca\u4e49\uff1a\/apps\/web\/src\/graphql\/withGraphQLClient.tsx \u7684\u6765\u6e90<\/p>\n
\u670d\u52a1\u5668\u7aef<\/h2>\n
Pub\/Sub\u5b9e\u73b0<\/h3>\n
\u6211\u6b63\u5728\u4f7f\u7528 pg-pubsub\u3002<\/p>\n
\u8fd9\u6b21\u6211\u8003\u8651\u4f7f\u7528PostgreSQL\u7684Pub\/Sub\u529f\u80fd\uff0c\u539f\u56e0\u662f\u4e3a\u4e86\u51cf\u5c11\u57fa\u7840\u8bbe\u65bd\u6210\u672c\u3002\u53e6\u5916\uff0c\u6700\u521d\u6211\u4eec\u6ca1\u6709\u4f7f\u7528GraphQL Yoga\u3002\u4f46\u662f\u5728\u8c03\u7814\u8fc7\u7a0b\u4e2d\u53d1\u73b0\u6709\u4e00\u4e9b\u514d\u8d39\u7684Redis\uff0c\u800c\u4e14\u540e\u6765\u6211\u4eec\u6539\u7528\u4e86Yoga\uff0c\u6240\u4ee5\u6211\u89c9\u5f97\u5982\u679c\u8981\u6b63\u5e38\u5730\u5b9e\u73b0\uff0c\u4f7f\u7528Redis\u548cYoga\u662f\u6700\u597d\u7684\u9009\u62e9\u3002<\/p>\n
\u7531\u4e8e\u5e78\u8fd0\u7684\u662f\uff0cPub\/Sub\u5ba2\u6237\u7aef\u7684\u5b9e\u73b0\u5df2\u5728\u57fa\u7840\u8bbe\u65bd\u5c42\u8fdb\u884c\uff0c\u56e0\u6b64\u8fc1\u79fb\u53d8\u5f97\u66f4\u7b80\u5355\u3002<\/p>\n
import<\/span> PGPubsub<\/span> from<\/span> '<\/span>pg-pubsub<\/span>'<\/span>;<\/span>\r\nimport<\/span> type<\/span> {<\/span> Pubsub<\/span> }<\/span> from<\/span> '<\/span>domain-interfaces<\/span>'<\/span>;<\/span>\r\nimport<\/span> asyncify<\/span> from<\/span> '<\/span>callback-to-async-iterator<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> storyChannelName<\/span> =<\/span> (<\/span>projectId<\/span>:<\/span> string<\/span>)<\/span> =><\/span> `project-<\/span>${<\/span>projectId<\/span>}<\/span>-stories`<\/span>;<\/span>\r\n\r\nexport<\/span> const<\/span> createPubsubClient<\/span> =<\/span> ():<\/span> Pubsub<\/span> =><\/span> {<\/span>\r\n  const<\/span> pubsubInstance<\/span> =<\/span> new<\/span> PGPubsub<\/span>(<\/span>process<\/span>.<\/span>env<\/span>.<\/span>DATABASE_URL<\/span>);<\/span>\r\n\r\n  return<\/span> {<\/span>\r\n    story<\/span>:<\/span> {<\/span>\r\n      subscribe<\/span>({<\/span> projectId<\/span> })<\/span> {<\/span>\r\n        return<\/span> asyncify<\/span>(<\/span>async<\/span> handler<\/span> =><\/span> {<\/span>\r\n          pubsubInstance<\/span>.<\/span>addChannel<\/span>(<\/span>storyChannelName<\/span>(<\/span>projectId<\/span>),<\/span> handler<\/span>);<\/span>\r\n        });<\/span>\r\n      },<\/span>\r\n      publish<\/span>(<\/span>item<\/span>)<\/span> {<\/span>\r\n        pubsubInstance<\/span>.<\/span>publish<\/span>(<\/span>storyChannelName<\/span>(<\/span>item<\/span>.<\/span>object<\/span>.<\/span>projectId<\/span>),<\/span> item<\/span>);<\/span>\r\n      },<\/span>\r\n    },<\/span>\r\n  };<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u6765\u6e90\uff1a\/\u57fa\u7840\u8bbe\u65bd\/\u6570\u636e\u5e93-\u53d1\u5e03\u8ba2\u9605\/\u6e90\u4ee3\u7801\/\u7d22\u5f15.ts<\/p>\n
\u8ba2\u9605<\/h3>\n
const<\/span> subscribed<\/span> =<\/span> context<\/span>.<\/span>pubsub<\/span>.<\/span>story<\/span>.<\/span>subscribe<\/span>({<\/span>\r\n  projectId<\/span>:<\/span> args<\/span>.<\/span>projectId<\/span>,<\/span>\r\n});<\/span>\r\nfor<\/span> await <\/span>(<\/span>const<\/span> it<\/span> of<\/span> subscribed<\/span>)<\/span> {<\/span>\r\n  if <\/span>(<\/span>it<\/span>.<\/span>triggeredBy<\/span>.<\/span>id<\/span> ===<\/span> context<\/span>.<\/span>currentUser<\/span>.<\/span>id<\/span>)<\/span> continue<\/span>;<\/span>\r\n\r\n  yield<\/span> {<\/span>\r\n    subscribeStoryUpdate<\/span>:<\/span> it<\/span>.<\/span>object<\/span>,<\/span>\r\n  };<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6765\u6e90\uff1a\/use-cases\/graphql-resolvers\/src\/modules\/story\/subscription-resolvers\/story.update\/subscribe-story-update.ts<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u79cd\u53ef\u80fd\u7684\u4e2d\u6587\u91ca\u4e49\uff1a<\/p>\n
\u6765\u6e90\uff1a\/use-cases\/graphql-resolvers\/src\/modules\/story\/subscription-resolvers\/story.update\/subscribe-story-update.ts\u3002<\/p>\n
\u53d1\u8868<\/h3>\n
context<\/span>.<\/span>pubsub<\/span>.<\/span>story<\/span>.<\/span>publish<\/span>({<\/span>\r\n  object<\/span>:<\/span> story<\/span>,<\/span>\r\n  triggeredBy<\/span>:<\/span> user<\/span>,<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n
\u6765\u6e90\uff1a\/use-cases\/graphql-resolvers\/src\/modules\/story\/mutation-resolvers\/story.update\/update-story.ts#L58-L60<\/p>\n
\u89e3\u91ca\uff1a\u5728\u6307\u5b9a\u4f4d\u7f6e\u7684\u4ee3\u7801\u6587\u4ef6\u4e2d\uff0c\u5b8c\u6210\u201c\u6545\u4e8b\u66f4\u65b0\u201d\u529f\u80fd\u7684\u5730\u65b9\u3002<\/p>\n
\u4e0b\u6b21\u4f1a\u901a\u77e5\u4f60<\/h1>\n
\u660e\u5929\u6211\u5c06\u5199\u4e00\u7bc7\u5173\u4e8e\u80cc\u666f\u5de5\u4f5c\u8005\u7684\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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