{"id":47755,"date":"2023-11-05T21:59:12","date_gmt":"2023-12-14T18:57:14","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90apollo-server-v2-0%e4%bd%bf%e7%94%a8%e3%80%91%e5%8f%af%e4%bb%a5%e9%80%9a%e8%bf%87schema-stitching%e5%8a%9f%e8%83%bd%e5%b0%86%e5%a4%9a%e4%b8%aagraphql-api%e6%9c%8d%e5%8a%a1%e5%90%88%e5%b9%b6\/"},"modified":"2024-05-04T07:43:36","modified_gmt":"2024-05-03T23:43:36","slug":"%e3%80%90apollo-server-v2-0%e4%bd%bf%e7%94%a8%e3%80%91%e5%8f%af%e4%bb%a5%e9%80%9a%e8%bf%87schema-stitching%e5%8a%9f%e8%83%bd%e5%b0%86%e5%a4%9a%e4%b8%aagraphql-api%e6%9c%8d%e5%8a%a1%e5%90%88%e5%b9%b6","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90apollo-server-v2-0%e4%bd%bf%e7%94%a8%e3%80%91%e5%8f%af%e4%bb%a5%e9%80%9a%e8%bf%87schema-stitching%e5%8a%9f%e8%83%bd%e5%b0%86%e5%a4%9a%e4%b8%aagraphql-api%e6%9c%8d%e5%8a%a1%e5%90%88%e5%b9%b6\/","title":{"rendered":"\u3010Apollo Server v2.0\u4f7f\u7528\u3011\u53ef\u4ee5\u901a\u8fc7Schema stitching\u529f\u80fd\u5c06\u591a\u4e2aGraphQL API\u670d\u52a1\u5408\u5e76\uff0c\u5e76\u4f20\u9012\u5934\u90e8\u4fe1\u606f"},"content":{"rendered":"

\u524d\u63d0\u77e5\u8b58 – Premise knowledge<\/h1>\n

GraphQL\u662f\u4e00\u79cd\u67e5\u8be2\u8bed\u8a00<\/h2>\n

\u8fd9\u662f\u7528\u4e8eWeb API\u7684\u67e5\u8be2\u8bed\u8a00\u3002<\/p>\n

# Schema<\/span>\r\ntype<\/span> Query<\/span> {<\/span>\r\n  todo<\/span>(<\/span>todoId<\/span>:<\/span>ID<\/span>!):<\/span> Todo<\/span>!<\/span>\r\n}<\/span>\r\ntype<\/span> Todo<\/span> {<\/span>\r\n  id<\/span>:<\/span> ID<\/span>!<\/span>\r\n  todoId<\/span>:<\/span> ID<\/span>!<\/span>\r\n  title<\/span>:<\/span> String<\/span>!<\/span>\r\n}<\/span>\r\n\r\n# Request<\/span>\r\nquery<\/span> GetTodo<\/span> {<\/span>\r\n  todo<\/span>(<\/span>todoId<\/span>:<\/span> 1<\/span>)<\/span> {<\/span>\r\n    id<\/span>\r\n    todoId<\/span>\r\n    title<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\n# Response<\/span>\r\n{<\/span>\r\n  \"<\/span>data<\/span>\":<\/span> {<\/span>\r\n    \"<\/span>todo<\/span>\":<\/span> {<\/span>\r\n      \"<\/span>id<\/span>\":<\/span> \"<\/span>dXNlci80Mgo<\/span>=\"<\/span>,<\/span>\r\n      \"<\/span>todoId<\/span>\":<\/span> 1<\/span>,<\/span>\r\n      \"<\/span>title<\/span>\":<\/span> \"<\/span>foo<\/span>\"<\/span>,<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\n# Request(\u5fc5\u8981\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u307f\u30ea\u30af\u30a8\u30b9\u30c8)<\/span>\r\nquery<\/span> GetTodo<\/span> {<\/span>\r\n  todo<\/span>(<\/span>todoId<\/span>:<\/span> 1<\/span>)<\/span> {<\/span>\r\n    title<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\n# Response(\u5fc5\u8981\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u307f\u304c\u30ec\u30b9\u30dd\u30f3\u30b9\u3055\u308c\u308b)<\/span>\r\n{<\/span>\r\n  \"<\/span>data<\/span>\":<\/span> {<\/span>\r\n    \"<\/span>todo<\/span>\":<\/span> {<\/span>\r\n      \"<\/span>title<\/span>\":<\/span> \"<\/span>foo<\/span>\"<\/span>,<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u300cGraphQL\u300d\u7684\u5165\u95e8\u975e\u5e38\u5168\u9762\uff0c\u901a\u8fc7\u4e0eREST\u7684\u6bd4\u8f83\u548cAPI\u548c\u524d\u7aef\u5b9e\u73b0\u7684\u5b66\u4e60\uff0c\u975e\u5e38\u6613\u61c2\u3002<\/p>\n
Schema stitching\u6307\u7684\u662f\u5c06\u591a\u4e2aGraphQL\u6a21\u5f0f\u5408\u5e76\u6210\u4e00\u4e2a\u5927\u578b\u7684\u6a21\u5f0f\u7684\u8fc7\u7a0b\u3002<\/h2>\n
Schema stitching\u662f\u4e00\u79cd\u529f\u80fd\uff0c\u5b83\u5c06\u591a\u4e2aGraphQL API\u7684\u6a21\u5f0f\u7ec4\u5408\u6210\u4e00\u4e2aGraphQL\u6a21\u5f0f\u3002
\n\u4ece\u201cstitching\u201d\uff08\u7f1d\u5408\u3001\u62fc\u63a5\uff09\u8fd9\u4e2a\u8bcd\u7684\u610f\u601d\u6765\u770b\uff0c\u53ef\u4ee5\u5927\u6982\u60f3\u8c61\u51fa\u5b83\u662f\u5c06\u591a\u4e2aGraphQL API\u670d\u52a1\u7684\u6a21\u5f0f\u62fc\u63a5\u5728\u4e00\u8d77\uff0c\u5f62\u6210\u4e00\u4e2aGraphQL API\u6a21\u5f0f\u7684\u5de5\u5177\u3002<\/p>\n
\"index-diagram.png\"<\/div>\n
\u7531\u4e8e\u53ef\u4ee5\u96c6\u6210\u6a21\u5f0f\uff0c\u5373\u4f7f\u7aef\u70b9\u5206\u79bb\uff0c\u8fd9\u4e5f\u662f\u4e0e\u5fae\u670d\u52a1\u67b6\u6784\u517c\u5bb9\u7684\u529f\u80fd\u3002
\n\u4e0eREST API\u4e0d\u540c\uff0cGraphQL\u4f5c\u4e3a\u4e00\u79cd\u8bed\u8a00\u89c4\u8303\uff0c\u53ef\u4ee5\u5b9a\u4e49\u6a21\u5f0f\uff0c\u56e0\u6b64\u53ef\u4ee5\u5b9e\u73b0\u8be5\u529f\u80fd\u3002<\/p>\n
\u521b\u5efaApollo Server v2.0\u9879\u76ee\u3002<\/h1>\n
\u5b89\u88c5\u6240\u9700\u7684\u8f6f\u4ef6\u5305\u3002<\/p>\n
mkdir <\/span>sample-project\r\ncd <\/span>sample-project\r\nyarn init --yes<\/span>\r\nyarn add apollo-link-context apollo-link-http apollo-server-express express graphql graphql-request graphql-tools merge-graphql-schemas node-fetch path\r\nyarn add -D<\/span> @babel\/cli @babel\/core @babel\/node @babel\/preset-env eslint nodemon\r\n<\/code><\/pre>\n
\u5c06package.json\u6587\u4ef6\u4e2d\u5b9a\u4e49scripts\u3002<\/p>\n
  ...<\/span>\r\n  \"scripts\"<\/span>:<\/span> {<\/span>\r\n    \"dev\"<\/span>:<\/span> \"nodemon --exec babel-node src\/index.js\"<\/span>,<\/span>\r\n    \"build\"<\/span>:<\/span> \"babel src --out-dir dist\"<\/span>,<\/span>\r\n    \"start\"<\/span>:<\/span> \"node dist\/index.js\"<\/span>\r\n  }<\/span>,<\/span>\r\n  ...<\/span>\r\n<\/code><\/pre>\n
\u76ee\u5f55\u7ed3\u6784<\/h2>\n
\u2523 schemas\r\n  \u2523 foo.gql\r\n  \u2523 ...\r\n  \u2517 bar.gql\r\n\u2523 resolvers\r\n  \u2523 foo.js\r\n  \u2523 ...\r\n  \u2517 bar.js\r\n\u2523 src\r\n  \u2517 index.js\r\n\u2523 .babelrc\r\n\u2523 .eslintrc.json(\u4efb\u610f)\r\n\u2523 package.json\r\n\u2517 yarn.lock\r\n<\/code><\/pre>\n
\u5728schemas\u548cresolvers\u4e0b\u5b9a\u4e49\u672c\u5730\u60f3\u8981\u5b9a\u4e49\u7684\u6a21\u5f0f\u548c\u89e3\u6790\u5668\u3002<\/p>\n
\u53e6\u5916\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u5728.babelrc\u6587\u4ef6\u4e2d\u8fdb\u884c\u4ee5\u4e0b\u8bbe\u7f6e\u3002<\/p>\n
{\r\n  \"presets\": [\r\n    [\r\n      \"@babel\/preset-env\", {\r\n        \"targets\": {\r\n          \"node\": \"current\"\r\n        }\r\n      }\r\n    ]\r\n  ]\r\n}\r\n<\/code><\/pre>\n
\u5982\u679c\u4e0d\u660e\u786e\u6307\u5b9a”targets”\uff0c\u5219\u5728\u540e\u7eed\u6b65\u9aa4\u4e2d\u4f1a\u51fa\u73b0”regeneratorRuntime is not defined”\u9519\u8bef\u3002
\n\u53c2\u8003\uff1ahttps:\/\/stackoverflow.com\/questions\/33527653\/babel-6-regeneratorruntime-is-not-defined#answer-53010685<\/p>\n
Apollo Server \u57fa\u672c\u4ee3\u7801\uff08\u4e0d\u5305\u542b\u6a21\u5f0f\u62fc\u63a5\uff09<\/h1>\n
\u8fd9\u4e2a\u4e0d\u662f\u672c\u6b21\u4e3b\u9898\uff0c\u4f46\u662f\u4e0b\u9762\u662f\u4e00\u4e2a\u6ca1\u6709\u4f7f\u7528Schema stitching\u7684Apollo Server\u7684\u4ee3\u7801\u793a\u4f8b\u3002
\n\u8fd9\u662f\u4e00\u4e2a\u7531\u672c\u5730\u5b9a\u4e49\u7684Schema\u548cResolver\u6784\u6210\u7684\u6700\u7b80\u5355\u7684\u5b9e\u73b0\u793a\u4f8b\u3002<\/p>\n
const<\/span> express<\/span> =<\/span> require<\/span>(<\/span>'<\/span>express<\/span>'<\/span>);<\/span>\r\nconst<\/span> {<\/span> ApolloServer<\/span> }<\/span> =<\/span> require<\/span>(<\/span>'<\/span>apollo-server-express<\/span>'<\/span>);<\/span>\r\nconst<\/span> path<\/span> =<\/span> require<\/span>(<\/span>'<\/span>path<\/span>'<\/span>);<\/span>\r\nconst<\/span> {<\/span> fileLoader<\/span>,<\/span> mergeTypes<\/span> }<\/span> =<\/span> require<\/span>(<\/span>'<\/span>merge-graphql-schemas<\/span>'<\/span>);<\/span>\r\n\r\nconst<\/span> runApp<\/span> =<\/span> async<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> localSchema<\/span> =<\/span> mergeTypes<\/span>(<\/span>fileLoader<\/span>(<\/span>path<\/span>.<\/span>join<\/span>(<\/span>__dirname<\/span>,<\/span> '<\/span>..\/schemas<\/span>'<\/span>)),<\/span> {<\/span> all<\/span>:<\/span> true<\/span> });<\/span>\r\n  const<\/span> resolvers<\/span> =<\/span> mergeResolvers<\/span>(<\/span>fileLoader<\/span>(<\/span>path<\/span>.<\/span>join<\/span>(<\/span>__dirname<\/span>,<\/span> '<\/span>.\/resolvers<\/span>'<\/span>)));<\/span>\r\n\r\n  const<\/span> app<\/span> =<\/span> express<\/span>();<\/span>\r\n\r\n  const<\/span> options<\/span> =<\/span> {<\/span>\r\n    schema<\/span>,<\/span>\r\n    resolvers<\/span>,<\/span>\r\n  };<\/span>\r\n\r\n  const<\/span> server<\/span> =<\/span> new<\/span> ApolloServer<\/span>(<\/span>options<\/span>);<\/span>\r\n  server<\/span>.<\/span>applyMiddleware<\/span>({<\/span> app<\/span> });<\/span>\r\n\r\n  const<\/span> port<\/span> =<\/span> process<\/span>.<\/span>env<\/span>.<\/span>PORT<\/span> ||<\/span> 4000<\/span>;<\/span>\r\n\r\n  app<\/span>.<\/span>listen<\/span>({<\/span> port<\/span> },<\/span> ()<\/span> =><\/span> {<\/span>\r\n    \/\/ eslint-disable-next-line no-console<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>`App listening on port <\/span>${<\/span>port<\/span>}<\/span>`<\/span>);<\/span>\r\n    \/\/ eslint-disable-next-line no-console<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>Press Ctrl+C to quit.<\/span>'<\/span>);<\/span>\r\n  });<\/span>\r\n};<\/span>\r\n\r\ntry<\/span> {<\/span>\r\n  runApp<\/span>();<\/span>\r\n}<\/span> catch<\/span> (<\/span>err<\/span>)<\/span> {<\/span>\r\n  \/\/ eslint-disable-next-line no-console<\/span>\r\n  console<\/span>.<\/span>error<\/span>(<\/span>err<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u542f\u52a8\u670d\u52a1\u5668\u3002<\/p>\n
$ <\/span>yarn dev\r\nApp listening on port 4000\r\nPress Ctrl+C to quit.\r\n<\/code><\/pre>\n
\u5f53\u60a8\u901a\u8fc7\u6d4f\u89c8\u5668\u8bbf\u95eehttp:\/\/localhost:4000\/graphql\u65f6\uff0c\u60a8\u53ef\u4ee5\u5728Apollo Server\u5b9e\u73b0\u7684Playground\u4e0a\u8fdb\u884c\u5a31\u4e50\u3002<\/p>\n
Schema stitching\u7684\u5b9e\u73b0<\/h1>\n
\u597d\u4e86\uff0c\u6211\u4eec\u5f00\u59cb\u6b63\u9898\u5427\u3002 , ba.)<\/p>\n
\u53ef\u4ee5\u4f7f\u7528graphql-tools\u5e93\u4e2d\u7684introspectSchema\u3001makeRemoteExecutableSchema\u548cmergeSchemas\u51fd\u6570\u6765\u8fdb\u884cSchema stitching\u3002<\/p>\n
\u6b64\u5916\uff0c\u5982\u679c\u9700\u8981\u53d1\u9001JWT\u7b49\u4ee4\u724c\u4ee5\u8fdb\u884c\u7ec8\u7aef\u7528\u6237\u8ba4\u8bc1\uff0c\u5219\u53ef\u4ee5\u5728Apollo Server\u7684\u9009\u9879\u4e2d\u914d\u7f6e\u5c06\u5fc5\u8981\u7684\u6807\u5934\u4fe1\u606f\u5b58\u50a8\u5728\u4e0a\u4e0b\u6587\u4e2d\uff0c\u5e76\u4f7f\u7528apollo-link-context\u7684setContext\u65b9\u6cd5\u91cd\u65b0\u8bbe\u7f6eheaders\uff0c\u4ece\u800c\u53ef\u4ee5\u5c06\u8bf7\u6c42\u7684\u6807\u5934\u4fe1\u606f\u8f6c\u53d1\u5230\u8fdb\u884c\u62fc\u63a5\u7684\u670d\u52a1\u3002<\/p>\n
...<\/span>\r\nimport<\/span> {<\/span> introspectSchema<\/span>,<\/span> makeRemoteExecutableSchema<\/span>,<\/span> mergeSchemas<\/span> }<\/span> from<\/span> '<\/span>graphql-tools<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span> setContext<\/span> }<\/span> from<\/span> '<\/span>apollo-link-context<\/span>'<\/span>;<\/span>\r\n...<\/span>\r\n\r\nconst<\/span> createRemoteSchema<\/span> =<\/span> async<\/span> (<\/span>uri<\/span>)<\/span> =><\/span> {<\/span>\r\n  const<\/span> http<\/span> =<\/span> createHttpLink<\/span>({<\/span>uri<\/span>,<\/span> fetch<\/span>});<\/span>\r\n  const<\/span> link<\/span> =<\/span> setContext<\/span>((<\/span>_<\/span>,<\/span> previousContext<\/span>)<\/span> =><\/span> {<\/span>\r\n    const<\/span> headers<\/span> =<\/span> {};<\/span>\r\n    if<\/span> (<\/span>previousContext<\/span> &&<\/span> previousContext<\/span>.<\/span>graphqlContext<\/span> &&<\/span> previousContext<\/span>.<\/span>graphqlContext<\/span>.<\/span>Authorization<\/span>)<\/span> {<\/span>\r\n      headers<\/span>.<\/span>Authorization<\/span> =<\/span> previousContext<\/span>.<\/span>graphqlContext<\/span>.<\/span>Authorization<\/span>;<\/span>\r\n    }<\/span>\r\n    return<\/span> {<\/span> headers<\/span> };<\/span>\r\n  }).<\/span>concat<\/span>(<\/span>http<\/span>);<\/span>\r\n  return<\/span> makeRemoteExecutableSchema<\/span>({<\/span>\r\n    schema<\/span>:<\/span> await<\/span> introspectSchema<\/span>(<\/span>link<\/span>),<\/span>\r\n    link<\/span>,<\/span>\r\n  });<\/span>\r\n};<\/span>\r\n\r\nconst<\/span> runApp<\/span> =<\/span> async<\/span> ()<\/span> =><\/span> {<\/span>\r\n  ...<\/span>\r\n  const<\/span> remoteSchemas<\/span> =<\/span> await<\/span> Promise<\/span>.<\/span>all<\/span>([<\/span>\r\n    '<\/span>http:\/\/example.com\/service1\/graphql<\/span>'<\/span>,<\/span>\r\n    '<\/span>http:\/\/example.com\/service2\/graphql<\/span>'<\/span>,<\/span>\r\n    '<\/span>http:\/\/example.com\/service3\/graphql<\/span>'<\/span>,<\/span>\r\n    '<\/span>http:\/\/example.com\/service4\/graphql<\/span>'<\/span>,<\/span>\r\n  ].<\/span>map<\/span>(<\/span>async<\/span> (<\/span>type<\/span>)<\/span> =><\/span> {<\/span>\r\n    return<\/span> await<\/span> createRemoteSchema<\/span>(<\/span>remoteHost<\/span> +<\/span> type<\/span>).<\/span>catch<\/span>(<\/span>error<\/span> =><\/span> {<\/span>\r\n      \/\/ eslint-disable-next-line no-console<\/span>\r\n      console<\/span>.<\/span>log<\/span>(<\/span>error<\/span>);<\/span>\r\n    });<\/span>\r\n  }));<\/span>\r\n\r\n  const<\/span> schema<\/span> =<\/span> mergeSchemas<\/span>({<\/span>\r\n    schemas<\/span>:<\/span> [<\/span>localSchema<\/span>].<\/span>concat<\/span>(<\/span>remoteSchemas<\/span>)<\/span>\r\n  });<\/span>\r\n\r\n  const<\/span> options<\/span> =<\/span> {<\/span>\r\n    context<\/span>:<\/span> ({<\/span> req<\/span> })<\/span> =><\/span> {<\/span>\r\n      return<\/span> {<\/span>\r\n        Authorization<\/span>:<\/span> req<\/span>.<\/span>headers<\/span>.<\/span>authorization<\/span>\r\n      };<\/span>\r\n    },<\/span>\r\n    schema<\/span>,<\/span>\r\n    resolvers<\/span>,<\/span>\r\n  };<\/span>\r\n\r\n  const<\/span> server<\/span> =<\/span> new<\/span> ApolloServer<\/span>(<\/span>options<\/span>);<\/span>\r\n  ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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