{"id":47649,"date":"2023-12-03T09:53:58","date_gmt":"2023-08-23T07:28:31","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8gae-go%e5%92%8cdatastore%e5%bc%80%e5%8f%91graphql-api%e3%80%82\/"},"modified":"2024-05-04T11:57:19","modified_gmt":"2024-05-04T03:57:19","slug":"%e4%bd%bf%e7%94%a8gae-go%e5%92%8cdatastore%e5%bc%80%e5%8f%91graphql-api%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8gae-go%e5%92%8cdatastore%e5%bc%80%e5%8f%91graphql-api%e3%80%82\/","title":{"rendered":"\u4f7f\u7528GAE Go\u548cDatastore\u5f00\u53d1GraphQL API"},"content":{"rendered":"

\u6211\u4f53\u9a8c\u4e86\u4f7f\u7528Google Cloud Platform\u7684\u6258\u7ba1\u670d\u52a1\u6765\u5f00\u53d1GraphQL API\u3002\u7531\u4e8e\u5bf9GraphQL\u8fd8\u662f\u521d\u5b66\u8005\uff0c\u6240\u4ee5\u6211\u4f1a\u8bb0\u5f55\u4e0b\u5728\u5b9e\u9645\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\u5b66\u5230\u7684\u5173\u4e8eGraphQL\u7684\u77e5\u8bc6\u3002<\/p>\n

\u4f7f\u7528\u4e86\u7684\u6280\u672f<\/h2>\n

App Engine SE Go 1.11
\nGo 1.11\u304c11\u6708\u306b\u03b2\u30ea\u30ea\u30fc\u30b9
\n2nd gen\u3068\u547c\u3070\u308c\u308b\u6b21\u4e16\u4ee3\u30e9\u30f3\u30bf\u30a4\u30e0<\/p>\n

Cloud Datastore
\n\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u306e\u9ad8\u3044NoSQL\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9<\/p>\n

Stackdriver
\nStackdriver Trace for Go\u3092\u4f7f\u3044\u305f\u304b\u3063\u305f\u305f\u3081\u4f7f\u7528<\/p>\n

\u53ea\u8981\u4e2a\u4eba\u4f7f\u7528\u7684\u8bdd\uff0c\u53ef\u4ee5\u514d\u8d39\u4f7f\u7528\u3002\u800c\u4e14\u64cd\u4f5c\u901f\u5ea6\u4e5f\u5f88\u5feb\uff01\u5728GAE\u7684\u7b2c\u4e8c\u4ee3\u4e0a\uff0c\u53ea\u8981\u666e\u901a\u5730\u5b9e\u73b0\u670d\u52a1\u5668\uff0c\u4e0d\u9700\u8981\u8fc7\u591a\u5730\u610f\u8bc6\u5230\u5e73\u53f0\u7684\u4e8b\u60c5\u3002\u5c3d\u7ba1\u5982\u6b64\uff0c\u5728\u9700\u8981\u7684\u65f6\u5019\uff0c\u53ea\u9700\u8981\u542f\u52a8\u6240\u9700\u7684\u90e8\u5206\uff0c\u901f\u5ea6\u5f88\u5feb\uff0c\u975e\u5e38\u597d\u3002<\/p>\n

\u4e3b\u8981\u56fe\u4e66\u9986<\/h2>\n

\u4f7f\u7528\u7684\u4e3b\u8981\u5e93\u5982\u4e0b\uff1a
\n– googleapis\/google-cloud-go
\nGCP\u63d0\u4f9b\u7684SDK
\n– graphql-go\/graphql
\n\u7528\u4e8eGolang\u7684GraphQL\u5e93
\n– graph-gophers\/dataloader
\n\u7528\u4e8e\u5ef6\u8fdf\u89e3\u6790\u5668\u8bc4\u4f30\u548c\u6279\u5904\u7406\u7684\u5e93\uff08\u5982\u4e0b\u6240\u8ff0\uff09<\/p>\n

\u636e\u8bf4Go\u8bed\u8a00\u7684GraphQL\u5e93\u6709\u4e24\u79cd\u4e3b\u8981\u7684\u65b9\u6cd5\uff1a
\n– \u4ece\u4ee3\u7801\u751f\u6210\u6a21\u5f0f\uff08\u53cd\u5c04\uff09\u751f\u6210\u6a21\u5f0f
\n– \u4ece\u6a21\u5f0f\u751f\u6210\u4ee3\u7801<\/p>\n

\u6211\u60f3\u5c1d\u8bd5\u4e24\u79cd\u65b9\u6cd5\uff0c\u4f46\u8fd9\u6b21\u6211\u8bd5\u7684\u662f\u524d\u8005\u3002
\n\u4e0d\u8fc7\u5b9e\u9645\u5c1d\u8bd5\u540e\uff0c\u6211\u89c9\u5f97\u540e\u8005\u7684\u65b9\u6cd5\u66f4\u597d\u3002\u5728Go\u8bed\u8a00\u4e2d\uff0c\u4ee3\u7801\u751f\u6210\u662f\u4e3b\u6d41\u65b9\u5f0f\uff0c\u800c\u4e14\u5f88\u5bb9\u6613\u4f9d\u8d56\u4e8e\u7a7a\u63a5\u53e3\u548c\u7c7b\u578b\u65ad\u8a00\u3002
\n\u4e0b\u6b21\u6211\u60f3\u8bd5\u8bd5\u540e\u8005\u7684\u65b9\u6cd5\uff08\u7ec4\u5408\u4f7f\u752899designs\/gqlgen\u548cvektah\/dataloaden\uff09\u3002
\n\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u672c\u6587\u4e2d\uff0c\u4e3b\u8981\u5173\u6ce8GraphQL\u548c\u5728GAE\u4e0a\u7684\u8fd0\u884c\uff0c\u6240\u4ee5\u4e0d\u4f1a\u6df1\u5165\u8ba8\u8bba\u8fd9\u4e9b\u5185\u5bb9\u3002<\/p>\n

\u5c1d\u8bd5\u5236\u4f5c\u4e86\u4e00\u4e9b\u4e1c\u897f<\/h2>\n

\u4ee3\u7801\u5df2\u5728GitHub\u4e0a\u516c\u5f00\u3002<\/p>\n

\u6211\u9009\u62e9\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7528\u4e2d\u6587\u8fdb\u884c\u672c\u5730\u5316\u6539\u5199\uff1a<\/p>\n

\u6211\u9009\u62e9\u4ee5\u535a\u5ba2\u53d1\u5e03API\u4e3a\u4e3b\u9898\u3002\u8fd9\u4e2a\u4e3b\u9898\u6ca1\u6709\u7279\u522b\u5927\u7684\u610f\u4e49\u3002
\n\u5728Datastore\u4e2d\uff0c\u7ed3\u6784\u4f53\u7684\u5b9a\u4e49\u5c31\u6210\u4e86\u6a21\u5f0f\u3002
\nDatastore\u6ca1\u6709\u5916\u952e\u8fd9\u6837\u7684\u6982\u5ff5\uff0c\u6240\u4ee5\u901a\u8fc7\u7ed9\u535a\u5ba2\u7ed3\u6784\u4f53\u6dfb\u52a0\u4e00\u4e2a\u4e0e\u7528\u6237\u7ed3\u6784\u4f53ID\u5b57\u6bb5\u76f8\u540c\u7684UserID\u5b57\u6bb5\u6765\u8868\u793a\u5173\u8054\u3002
\n\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4e00\u5bf9\u591a\u5173\u7cfb\uff0c\u7528\u6237\u53ef\u4ee5\u62e5\u6709\u591a\u4e2a\u535a\u5ba2\u3002<\/p>\n

type<\/span> User<\/span> struct<\/span> {<\/span>\r\n    ID<\/span>    string<\/span> `json:\"id\" datastore:\"-\"`<\/span>\r\n    Name<\/span>  string<\/span> `json:\"name\"`<\/span>\r\n    EMail<\/span> string<\/span> `json:\"email\"`<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> Blog<\/span> struct<\/span> {<\/span>\r\n    ID<\/span>        string<\/span>    `json:\"id\" datastore:\"-\"`<\/span>\r\n    UserID<\/span>    string<\/span>    `json:\"userId\"`<\/span>\r\n    CreatedAt<\/span> time<\/span>.<\/span>Time<\/span> `json:\"createdAt\"`<\/span>\r\n    Title<\/span>     string<\/span>    `json:\"title\"`<\/span>\r\n    Content<\/span>   string<\/span>    `json:\"content\"`<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> BlogList<\/span> struct<\/span> {<\/span>\r\n    Nodes<\/span>      []<\/span>Blog<\/span> `json:\"nodes\"`<\/span>\r\n    TotalCount<\/span> int<\/span>    `json:\"totalCount\"`<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5f00\u53d1\u8fc7\u7a0b<\/h2>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u8981\u7684\u6b65\u9aa4\uff1a
\n1. \u5b9a\u4e49\u67b6\u6784
\n2. \u5b9e\u73b0\u89e3\u6790\u5668
\n3. \u5b9e\u73b0\u7ec8\u7aef\uff08\u670d\u52a1\u5668\uff09<\/p>\n
\u90a3\u4e48\uff0c\u6211\u4eec\u6309\u987a\u5e8f\u4e00\u4e00\u6765\u770b\u5427\u3002<\/p>\n
1. \u5b9a\u4e49\u6a21\u5f0f<\/h3>\n
\u5728Go\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u7ed3\u6784\u4f53\u6765\u8868\u793aSchema\u3002\u6211\u4eec\u5c06\u5728SchemaConfig\u4e2d\u5b9a\u4e49Query\u548cMutation\u3002
\n\u94fe\u63a5\uff1ahttps:\/\/github.com\/monmaru\/gae-graphql\/blob\/master\/application\/gql\/scheme.go#L9-L13<\/p>\n
func<\/span> NewSchema<\/span>(<\/span>ur<\/span> repository<\/span>.<\/span>UserRepository<\/span>,<\/span> br<\/span> repository<\/span>.<\/span>BlogRepository<\/span>)<\/span> (<\/span>graphql<\/span>.<\/span>Schema<\/span>,<\/span> error<\/span>)<\/span> {<\/span>\r\n    resolver<\/span> :=<\/span> newResolver<\/span>(<\/span>ur<\/span>,<\/span> br<\/span>)<\/span>\r\n    return<\/span> graphql<\/span>.<\/span>NewSchema<\/span>(<\/span>graphql<\/span>.<\/span>SchemaConfig<\/span>{<\/span>\r\n        Query<\/span>:<\/span>    newQuery<\/span>(<\/span>resolver<\/span>),<\/span>\r\n        Mutation<\/span>:<\/span> newMutation<\/span>(<\/span>resolver<\/span>),<\/span>\r\n    })<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u662fMutation\u7684\u4e00\u4e2a\u4f8b\u5b50\u3002\u5373\u4f7f\u662f\u67e5\u8be2\uff08Query\uff09\uff0c\u505a\u7684\u4e8b\u60c5\u4e5f\u662f\u4e00\u6837\u7684\u3002
\n\u6211\u4eec\u5c06\u5b9a\u4e49\u6240\u9700\u7684\u5b57\u6bb5\u3002
\n\u672c\u6b21\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06\u521b\u5efa\u4e00\u4e2a\u540d\u4e3acreateUser\u7684\u7528\u6237\u548c\u4e00\u4e2a\u540d\u4e3acreateBlog\u7684\u535a\u5ba2\u3002
\n\u6211\u4eec\u5c06\u4f7f\u7528Type\u6765\u5b9a\u4e49\u5728API\u4e2d\u5904\u7406\u7684\u6570\u636e\uff0c\u5e76\u4f7f\u7528Args\u6765\u5b9a\u4e49\u4ece\u8bf7\u6c42\u4e2d\u63a5\u6536\u7684\u53c2\u6570\u3002
\n\u6211\u4eec\u5c06\u5728Resolve\u4e2d\u4f20\u9012\u4e00\u4e2a\u51fd\u6570\u6765\u89e3\u6790\u5b57\u6bb5\u3002\uff08\u8be6\u89c1\u4e0b\u6587\uff09
\nhttps:\/\/github.com\/monmaru\/gae-graphql\/blob\/master\/application\/gql\/mutation.go#L6-L29<\/p>\n
func<\/span> newMutation<\/span>(<\/span>r<\/span> resolver<\/span>)<\/span> *<\/span>graphql<\/span>.<\/span>Object<\/span> {<\/span>\r\n    return<\/span> graphql<\/span>.<\/span>NewObject<\/span>(<\/span>graphql<\/span>.<\/span>ObjectConfig<\/span>{<\/span>\r\n        Name<\/span>:<\/span> \"Mutation\"<\/span>,<\/span>\r\n        Fields<\/span>:<\/span> graphql<\/span>.<\/span>Fields<\/span>{<\/span>\r\n            \"createUser\"<\/span>:<\/span> &<\/span>graphql<\/span>.<\/span>Field<\/span>{<\/span>\r\n                Type<\/span>:<\/span>        newCreateUserInputType<\/span>(),<\/span>\r\n                Description<\/span>:<\/span> \"Add a user\"<\/span>,<\/span>\r\n                Args<\/span>:<\/span> graphql<\/span>.<\/span>FieldConfigArgument<\/span>{<\/span>\r\n                    \"name\"<\/span>:<\/span>  &<\/span>graphql<\/span>.<\/span>ArgumentConfig<\/span>{<\/span>Type<\/span>:<\/span> graphql<\/span>.<\/span>NewNonNull<\/span>(<\/span>graphql<\/span>.<\/span>String<\/span>)},<\/span>\r\n                    \"email\"<\/span>:<\/span> &<\/span>graphql<\/span>.<\/span>ArgumentConfig<\/span>{<\/span>Type<\/span>:<\/span> graphql<\/span>.<\/span>NewNonNull<\/span>(<\/span>graphql<\/span>.<\/span>String<\/span>)},<\/span>\r\n                },<\/span>\r\n                Resolve<\/span>:<\/span> r<\/span>.<\/span>createUsersBatch<\/span>,<\/span>\r\n            },<\/span>\r\n            \"createBlog\"<\/span>:<\/span> &<\/span>graphql<\/span>.<\/span>Field<\/span>{<\/span>\r\n                Type<\/span>:<\/span>        newCreateBlogInputType<\/span>(),<\/span>\r\n                Description<\/span>:<\/span> \"Add a blog\"<\/span>,<\/span>\r\n                Args<\/span>:<\/span> graphql<\/span>.<\/span>FieldConfigArgument<\/span>{<\/span>\r\n                    \"userId\"<\/span>:<\/span>  &<\/span>graphql<\/span>.<\/span>ArgumentConfig<\/span>{<\/span>Type<\/span>:<\/span> graphql<\/span>.<\/span>NewNonNull<\/span>(<\/span>graphql<\/span>.<\/span>String<\/span>)},<\/span>\r\n                    \"title\"<\/span>:<\/span>   &<\/span>graphql<\/span>.<\/span>ArgumentConfig<\/span>{<\/span>Type<\/span>:<\/span> graphql<\/span>.<\/span>NewNonNull<\/span>(<\/span>graphql<\/span>.<\/span>String<\/span>)},<\/span>\r\n                    \"content\"<\/span>:<\/span> &<\/span>graphql<\/span>.<\/span>ArgumentConfig<\/span>{<\/span>Type<\/span>:<\/span> graphql<\/span>.<\/span>NewNonNull<\/span>(<\/span>graphql<\/span>.<\/span>String<\/span>)},<\/span>\r\n                },<\/span>\r\n                Resolve<\/span>:<\/span> r<\/span>.<\/span>createBlogsBatch<\/span>,<\/span>\r\n            },<\/span>\r\n        },<\/span>\r\n    })<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
2. \u5b9e\u73b0Resolver<\/h3>\n
\u4ee5\u4e0b\u662f\u5bf9\u4e0a\u8ff0\u5185\u5bb9\u7684\u4e2d\u6587\u91ca\u4e49\uff1a<\/p>\n
\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u6765\u89e3\u91ca\u3002\u89e3\u6790\u5668\u53ea\u9700\u8981\u5728\u5b9e\u73b0\u4e2d\u4ecegraphql.ResolveParams\u4e2d\u63d0\u53d6\u4e0a\u4e0b\u6587\u548c\u6240\u9700\u53c2\u6570\uff0c\u7136\u540e\u5c06\u5176\u4f20\u9012\u7ed9Datastore\u3002\u8fd9\u5c31\u50cf\u5728RDB\u4e2d\u6267\u884cINSERT\u8bed\u53e5\u4e00\u6837\u3002\u5728\u8fd9\u65b9\u9762\uff0c\u8fc7\u5ea6\u4f9d\u8d56\u7a7a\u63a5\u53e3\u548c\u7c7b\u578b\u65ad\u8a00\u53ef\u80fd\u4f1a\u6709\u4e9b\u56f0\u96be\u3002<\/p>\n
\u8be6\u89c1\uff1ahttps:\/\/github.com\/monmaru\/gae-graphql\/blob\/master\/application\/gql\/resolver.go#L93-L103<\/p>\n
func<\/span> (<\/span>r<\/span> *<\/span>graphQLResolver<\/span>)<\/span> createUser<\/span>(<\/span>params<\/span> graphql<\/span>.<\/span>ResolveParams<\/span>)<\/span> (<\/span>interface<\/span>{},<\/span> error<\/span>)<\/span> {<\/span>\r\n    ctx<\/span> :=<\/span> params<\/span>.<\/span>Context<\/span>\r\n    defer<\/span> log<\/span>.<\/span>Duration<\/span>(<\/span>ctx<\/span>,<\/span> time<\/span>.<\/span>Now<\/span>(),<\/span> \"[graphQLResolver.createUser]\"<\/span>)<\/span>\r\n    name<\/span>,<\/span> _<\/span> :=<\/span> params<\/span>.<\/span>Args<\/span>[<\/span>\"name\"<\/span>]<\/span>.<\/span>(<\/span>string<\/span>)<\/span>\r\n    email<\/span>,<\/span> _<\/span> :=<\/span> params<\/span>.<\/span>Args<\/span>[<\/span>\"email\"<\/span>]<\/span>.<\/span>(<\/span>string<\/span>)<\/span>\r\n    user<\/span> :=<\/span> &<\/span>model<\/span>.<\/span>User<\/span>{<\/span>\r\n        Name<\/span>:<\/span>  name<\/span>,<\/span>\r\n        EMail<\/span>:<\/span> email<\/span>,<\/span>\r\n    }<\/span>\r\n    return<\/span> r<\/span>.<\/span>ur<\/span>.<\/span>Create<\/span>(<\/span>ctx<\/span>,<\/span> user<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
3. \u5b9e\u73b0\u7ec8\u7aef\u70b9\uff08\u670d\u52a1\u5668\uff09\u3002<\/h3>\n
\u53ea\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u7ec8\u7aef\u70b9\u5373\u53ef\u3002
\n\u5c06\u8bf7\u6c42\u4e3b\u4f53\u4f5c\u4e3a\u5b57\u7b26\u4e32\u5168\u90e8\u8bfb\u53d6\uff0c\u4e0e\u67b6\u6784\u4e00\u8d77\u4f20\u9012\u7ed9graphql.Do\u3002
\n\u6700\u540e\uff0c\u4ee5JSON\u683c\u5f0f\u8fd4\u56de\u63a5\u6536\u5230\u7684\u7ed3\u679c\u3002
\n\u4ee5\u4e0a\uff01<\/p>\n
http<\/span>.<\/span>HandleFunc<\/span>(<\/span>\"\/graphql\"<\/span>,<\/span> func<\/span>(<\/span>w<\/span> http<\/span>.<\/span>ResponseWriter<\/span>,<\/span> r<\/span> *<\/span>http<\/span>.<\/span>Request<\/span>)<\/span> {<\/span>\r\n    body<\/span>,<\/span> err<\/span> :=<\/span> ioutil<\/span>.<\/span>ReadAll<\/span>(<\/span>r<\/span>.<\/span>Body<\/span>)<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        http<\/span>.<\/span>Error<\/span>(<\/span>w<\/span>,<\/span> err<\/span>.<\/span>Error<\/span>(),<\/span> http<\/span>.<\/span>StatusBadRequest<\/span>)<\/span>\r\n        return<\/span>\r\n    }<\/span>\r\n    result<\/span> :=<\/span> graphql<\/span>.<\/span>Do<\/span>(<\/span>graphql<\/span>.<\/span>Params<\/span>{<\/span>\r\n        Schema<\/span>:<\/span>        schema<\/span>,<\/span>\r\n        RequestString<\/span>:<\/span> string<\/span>(<\/span>body<\/span>),<\/span>\r\n    })<\/span>\r\n    if<\/span> len<\/span>(<\/span>result<\/span>.<\/span>Errors<\/span>)<\/span> ><\/span> 0<\/span> {<\/span>\r\n        fmt<\/span>.<\/span>Printf<\/span>(<\/span>\"wrong result, unexpected errors: %v\"<\/span>,<\/span> result<\/span>.<\/span>Errors<\/span>)<\/span>\r\n    }<\/span>\r\n    json<\/span>.<\/span>NewEncoder<\/span>(<\/span>w<\/span>)<\/span>.<\/span>Encode<\/span>(<\/span>result<\/span>)<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n
\u6b64\u5916\uff0c\u4f7f\u7528graphql-go\/handler\uff0c\u60a8\u53ef\u4ee5\u8f7b\u677e\u5730\u521b\u5efagraphiql\u548cplayground\u7684Web\u9875\u9762\u3002https:\/\/github.com\/monmaru\/gae-graphql\/blob\/master\/interfaces\/handler\/graphiql.go<\/p>\n
\u8ba9\u6211\u4eec\u8ffd\u8e2a\u8fd9\u4e2a\u52a8\u4f5c<\/h2>\n
\u6211\u4eec\u5c06\u83b7\u53d6\u4e24\u4e2a\u7528\u6237\u7684\u4fe1\u606f\u4ee5\u53ca\u7528\u6237\u6240\u53d1\u5e03\u7684\u6587\u7ae0\u3002<\/p>\n
{<\/span>\r\n  u1<\/span>:<\/span> user<\/span>(<\/span>id<\/span>:<\/span> \"5635703144710144\"<\/span>)<\/span> {<\/span>\r\n    name<\/span>\r\n    posts<\/span>(<\/span>limit<\/span>:<\/span> 3<\/span>)<\/span> {<\/span>\r\n      nodes<\/span> {<\/span>\r\n        title<\/span>\r\n        createdAt<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n  u2<\/span>:<\/span> user<\/span>(<\/span>id<\/span>:<\/span> \"5153049148391424\"<\/span>)<\/span> {<\/span>\r\n    name<\/span>\r\n    posts<\/span>(<\/span>limit<\/span>:<\/span> 3<\/span>)<\/span> {<\/span>\r\n      nodes<\/span> {<\/span>\r\n        title<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4e00\u5207\u5b89\u597d\uff0c\u6709\u6240\u52a8\u9759\u4e86\uff01??<\/p>\n
{\r\n  \"data\": {\r\n    \"u1\": {\r\n      \"name\": \"Jiro\",\r\n      \"posts\": {\r\n        \"nodes\": [\r\n          {\r\n            \"createdAt\": \"2018-12-16T06:19:15.683822Z\",\r\n            \"title\": \"pogeff\"\r\n          },\r\n          {\r\n            \"createdAt\": \"2018-12-16T06:19:15.68376Z\",\r\n            \"title\": \"mogefff\"\r\n          },\r\n          {\r\n            \"createdAt\": \"2018-12-16T06:19:15.683629Z\",\r\n            \"title\": \"hogeff\"\r\n          }\r\n        ]\r\n      }\r\n    },\r\n    \"u2\": {\r\n      \"name\": \"Taro\",\r\n      \"posts\": {\r\n        \"nodes\": []\r\n      }\r\n    }\r\n  }\r\n}\r\n<\/code><\/pre>\n
\u597d\u5427\uff0c\u90a3\u6211\u4eec\u6765\u770b\u770b\u5185\u90e8\u662f\u5982\u4f55\u5904\u7406\u7684\u5427? \u6211\u4eec\u4f7f\u7528 Stackdriver Trace\u3002<\/p>\n
Stackdriver Trace (\u7ffb\u8bd1\uff1a\u5806\u6808\u9a71\u52a8\u8ddf\u8e2a)<\/h3>\n
\u7531\u4e8e\u7b2c\u4e8c\u4ee3\u65e0\u6cd5\u81ea\u52a8\u6536\u96c6\u6570\u636e\uff0c\u56e0\u6b64\u9700\u8981\u8fdb\u884c\u4e00\u4e9b\u5b9e\u65bd\u5de5\u4f5c\u3002\u9996\u5148\uff0c\u9700\u8981\u6ce8\u518cExporter\u3002<\/p>\n
\/\/ Stackdriver Trace<\/span>\r\nexporter<\/span>,<\/span> err<\/span> :=<\/span> stackdriver<\/span>.<\/span>NewExporter<\/span>(<\/span>stackdriver<\/span>.<\/span>Options<\/span>{<\/span>\r\n    ProjectID<\/span>:<\/span> projID<\/span>,<\/span>\r\n})<\/span>\r\nif<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n    log<\/span>.<\/span>Fatal<\/span>(<\/span>err<\/span>)<\/span>\r\n}<\/span>\r\ntrace<\/span>.<\/span>RegisterExporter<\/span>(<\/span>exporter<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u8bbe\u7f6e\u4f20\u64ad\u5e76\u542f\u52a8\u670d\u52a1\u5668\u3002<\/p>\n
server<\/span> :=<\/span> &<\/span>http<\/span>.<\/span>Server<\/span>{<\/span>\r\n    Addr<\/span>:<\/span> fmt<\/span>.<\/span>Sprintf<\/span>(<\/span>\":%s\"<\/span>,<\/span> port<\/span>),<\/span>\r\n    Handler<\/span>:<\/span> &<\/span>ochttp<\/span>.<\/span>Handler<\/span>{<\/span>\r\n        Handler<\/span>:<\/span>     router<\/span>,<\/span>\r\n        Propagation<\/span>:<\/span> &<\/span>propagation<\/span>.<\/span>HTTPFormat<\/span>{},<\/span>\r\n    },<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6dfb\u52a0\u8fd9\u6837\u7684\u4ee3\u7801\u5e76\u8fdb\u884c\u90e8\u7f72\uff0c\u5c31\u80fd\u4e86\u89e3\u5b83\u7684\u8fd0\u884c\u65b9\u5f0f\u3002
\n\u901a\u8fc7\u4e0eDatastore\u548cRPC\u8fdb\u884c\u5927\u7ea64\u6b21\u901a\u4fe1\uff0c\u6211\u53d1\u73b0\u5b83\u662f\u6309\u987a\u5e8f\u8fd0\u884c\u7684\u3002<\/p>\n
\"slow-trace.png\"<\/div>\n
\u8fd9\u4e0e\u5176\u4ed6\u6587\u7ae0\u4e2d\u63d0\u5230\u7684N+1\u95ee\u9898\u76f8\u5173\u3002<\/p>\n
N+1\u95ee\u9898<\/h3>\n
\u8fd9\u662f\u7531\u4e8eGraphQL\u5355\u72ec\u4e14\u9012\u5f52\u5730\u6267\u884c\u89e3\u6790\u5668\u800c\u5bfc\u81f4\u7684\u95ee\u9898\u3002
\n\u7b80\u800c\u8a00\u4e4b\uff0c\u5f88\u5bb9\u6613\u53d1\u751f\u6bcf\u6b21\u63d2\u5165\u4e00\u4e2a\u8fed\u4ee3\uff0c\u800c\u4e0d\u662f\u5c06\u591a\u4e2aN\u4e2a\u6570\u636e\u4e00\u8d77\u63d2\u5165\u3002<\/p>\n
\u5728\u4e2d\u56fd\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff0c\u91ca\u4e49\u4ee5\u4e0b\u5185\u5bb9\uff1a
\n\u5904\u7406\u65f6\u95f4\u4f1a\u53d8\u5f97\u5f88\u957f\uff0c\u800c\u4e14\u5e0c\u671b\u80fd\u907f\u514d\u591a\u6b21\u901a\u4fe1\u3002
\nGraphQL\u4f3c\u4e4e\u901a\u8fc7\u5ef6\u8fdf\u8bc4\u4f30\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n
\u5ef6\u8fdf\u8bc4\u4f30<\/h3>\n
\u9700\u8981\u5c06\u91cd\u590d\u6267\u884cN\u6b21\u7684SQL\u8bed\u53e5\u5408\u5e76\u4e3a\u4e00\u4e2a\u3002
\n\u901a\u8fc7\u5148\u5c06\u5b83\u4eec\u6682\u5b58\u8d77\u6765\uff0c\u4e0d\u7acb\u5373\u5bf9\u5176\u8fdb\u884c\u89e3\u6790\uff0c\u800c\u662f\u5728\u4e4b\u540e\u4e00\u8d77\u8fdb\u884c\u89e3\u6790\u548c\u8bc4\u4f30\uff0c\u4ece\u800c\u89e3\u51b3N+1\u95ee\u9898\u3002<\/p>\n
Facebook \u6b63\u5728\u53d1\u5e03\u9002\u7528\u4e8e JavaScript \u7684\u5e93\uff0c\u4f46\u672c\u6b21\u5c06\u4f7f\u7528 Go \u5b9e\u73b0\u7684 graph-gophers\/dataloader\u3002\u8fd9\u4e2a\u5e93\u53ef\u4ee5\u901a\u8fc7 GetMulti \u6216 PutMulti \u800c\u4e0d\u662f Get \u6216 Put \u5728 Datastore \u4e0a\u5b9e\u73b0\u6279\u91cf\u5904\u7406\u3002<\/p>\n
\u5c1d\u8bd5\u4f7f\u7528\u6570\u636e\u52a0\u8f7d\u5668\uff08dataloader\uff09\u3002<\/h3>\n
\u4f7f\u7528dataloader\u9700\u8981\u4ee5\u4e0b\u7684\u5b9e\u73b0\u3002<\/p>\n
    \n
  • \n
      \u30d0\u30c3\u30c1\u51e6\u7406\u7528\u306e\u95a2\u6570\u3092\u5b9a\u7fa9<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          \u30ea\u30be\u30eb\u30d0\u30fc\u3092\u5b9f\u88c5<\/ul>\n<\/li>\n<\/ul>\n
          dataloader.Loader\u3092\u751f\u6210<\/p>\n
          \u5b9a\u4e49\u7528\u4e8e\u6279\u5904\u7406\u7684\u51fd\u6570\u3002<\/h4>\n
          \u4ecedataloader.Keys\u63a5\u6536\u53c2\u6570\u5217\u8868\uff0c\u5e76\u5c06\u5b83\u4eec\u4e00\u8d77\u4f20\u9012\u7ed9Datastore\u3002\u540c\u65f6\uff0c\u5c06\u5904\u7406\u7ed3\u679c\u4ee5\u5217\u8868\u5f62\u5f0f[]*dataloader.Result\u8fd4\u56de\u3002
          \n\u53c2\u8003\u94fe\u63a5\uff1ahttps:\/\/github.com\/monmaru\/gae-graphql\/blob\/master\/application\/gql\/batch_functions.go#L23-L51<\/p>\n
          return<\/span> func<\/span>(<\/span>ctx<\/span> context<\/span>.<\/span>Context<\/span>,<\/span> keys<\/span> dataloader<\/span>.<\/span>Keys<\/span>)<\/span> []<\/span>*<\/span>dataloader<\/span>.<\/span>Result<\/span> {<\/span>\r\n    defer<\/span> log<\/span>.<\/span>Duration<\/span>(<\/span>ctx<\/span>,<\/span> time<\/span>.<\/span>Now<\/span>(),<\/span> \"[GetUsersBatchFunc]\"<\/span>)<\/span>\r\n    var<\/span> strIDs<\/span> []<\/span>string<\/span>\r\n    for<\/span> _<\/span>,<\/span> key<\/span> :=<\/span> range<\/span> keys<\/span> {<\/span>\r\n        strID<\/span>,<\/span> ok<\/span> :=<\/span> key<\/span>.<\/span>Raw<\/span>()<\/span>.<\/span>(<\/span>string<\/span>)<\/span>\r\n        if<\/span> !<\/span>ok<\/span> {<\/span>\r\n            return<\/span> handleError<\/span>(<\/span>ctx<\/span>,<\/span> errors<\/span>.<\/span>New<\/span>(<\/span>\"Invalid key value\"<\/span>))<\/span>\r\n        }<\/span>\r\n        strIDs<\/span> =<\/span> append<\/span>(<\/span>strIDs<\/span>,<\/span> strID<\/span>)<\/span>\r\n    }<\/span>\r\n\r\n    users<\/span>,<\/span> err<\/span> :=<\/span> ur<\/span>.<\/span>GetMulti<\/span>(<\/span>ctx<\/span>,<\/span> strIDs<\/span>)<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        log<\/span>.<\/span>Errorf<\/span>(<\/span>ctx<\/span>,<\/span> err<\/span>.<\/span>Error<\/span>())<\/span>\r\n        return<\/span> handleError<\/span>(<\/span>ctx<\/span>,<\/span> err<\/span>)<\/span>\r\n    }<\/span>\r\n\r\n    var<\/span> results<\/span> []<\/span>*<\/span>dataloader<\/span>.<\/span>Result<\/span>\r\n    for<\/span> _<\/span>,<\/span> user<\/span> :=<\/span> range<\/span> users<\/span> {<\/span>\r\n        result<\/span> :=<\/span> dataloader<\/span>.<\/span>Result<\/span>{<\/span>\r\n            Data<\/span>:<\/span>  user<\/span>,<\/span>\r\n            Error<\/span>:<\/span> nil<\/span>,<\/span>\r\n        }<\/span>\r\n        results<\/span> =<\/span> append<\/span>(<\/span>results<\/span>,<\/span> &<\/span>result<\/span>)<\/span>\r\n    }<\/span>\r\n\r\n    log<\/span>.<\/span>Infof<\/span>(<\/span>ctx<\/span>,<\/span> \"[GetUsersBatchFunc] batch size: %d\"<\/span>,<\/span> len<\/span>(<\/span>results<\/span>))<\/span>\r\n    return<\/span> results<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
          \u5b9e\u73b0\u89e3\u6790\u5668<\/h4>\n
          \u89e3\u6790\u5668\u7684\u5b9e\u73b0\u5982\u4e0b\uff1a
          \n\u4ece\u4e0a\u4e0b\u6587\u4e2d\u63d0\u53d6Loader\u3002
          \n\u5c06\u63a5\u6536\u5230\u7684\u53c2\u6570\u653e\u5165Key\u4e2d\u5e76\u4f20\u9012\u7ed9Loader\u3002
          \n\u6b64\u65f6\uff0c\u5e76\u4e0d\u4f1a\u53d1\u751f\u4e0e\u6570\u636e\u5b58\u50a8\u4e4b\u95f4\u7684\u901a\u4fe1\uff0c\u800c\u662f\u6682\u65f6\u5b58\u50a8\u4e3a\u201c\u6876\u201d\u3002\u5b83\u5c06\u5728\u524d\u9762\u63d0\u5230\u7684\u6279\u5904\u7406\u51fd\u6570\u4e2d\u4e00\u6b21\u6027\u5904\u7406\u3002<\/p>\n
          func<\/span> (<\/span>r<\/span> *<\/span>graphQLResolver<\/span>)<\/span> getUsersBatch<\/span>(<\/span>params<\/span> graphql<\/span>.<\/span>ResolveParams<\/span>)<\/span> (<\/span>interface<\/span>{},<\/span> error<\/span>)<\/span> {<\/span>\r\n    ctx<\/span> :=<\/span> params<\/span>.<\/span>Context<\/span>\r\n    defer<\/span> log<\/span>.<\/span>Duration<\/span>(<\/span>ctx<\/span>,<\/span> time<\/span>.<\/span>Now<\/span>(),<\/span> \"[graphQLResolver.getUsersBatch]\"<\/span>)<\/span>\r\n    strID<\/span>,<\/span> ok<\/span> :=<\/span> params<\/span>.<\/span>Args<\/span>[<\/span>\"id\"<\/span>]<\/span>.<\/span>(<\/span>string<\/span>)<\/span>\r\n    if<\/span> !<\/span>ok<\/span> {<\/span>\r\n        return<\/span> nil<\/span>,<\/span> errors<\/span>.<\/span>New<\/span>(<\/span>\"invalid id\"<\/span>)<\/span>\r\n    }<\/span>\r\n\r\n    key<\/span> :=<\/span> newGetUserKey<\/span>(<\/span>strID<\/span>)<\/span>\r\n    v<\/span> :=<\/span> ctx<\/span>.<\/span>Value<\/span>(<\/span>GetUsersKey<\/span>)<\/span>\r\n    loader<\/span>,<\/span> ok<\/span> :=<\/span> v<\/span>.<\/span>(<\/span>*<\/span>dataloader<\/span>.<\/span>Loader<\/span>)<\/span>\r\n    if<\/span> !<\/span>ok<\/span> {<\/span>\r\n        return<\/span> nil<\/span>,<\/span> errors<\/span>.<\/span>New<\/span>(<\/span>\"loader is empty\"<\/span>)<\/span>\r\n    }<\/span>\r\n\r\n    thunk<\/span> :=<\/span> loader<\/span>.<\/span>Load<\/span>(<\/span>ctx<\/span>,<\/span> key<\/span>)<\/span>\r\n    return<\/span> func<\/span>()<\/span> (<\/span>interface<\/span>{},<\/span> error<\/span>)<\/span> {<\/span>\r\n        return<\/span> thunk<\/span>()<\/span>\r\n    },<\/span> nil<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
          \u751f\u6210\u4e00\u4e2adataloader.Loader\u5b9e\u4f8b<\/h4>\n
          \u6211\u5b9e\u73b0\u4e86\u4e00\u4e2a\u4e2d\u95f4\u4ef6\u6765\u5904\u7406\u5b83\u4eec\u5e76\u6839\u636e\u9700\u8981\u751f\u6210\u52a0\u8f7d\u5668\u3002<\/p>\n
          \r\nfunc<\/span> (<\/span>i<\/span> *<\/span>contextInjector<\/span>)<\/span> Inject<\/span>(<\/span>next<\/span> http<\/span>.<\/span>Handler<\/span>)<\/span> http<\/span>.<\/span>Handler<\/span> {<\/span>\r\n    return<\/span> http<\/span>.<\/span>HandlerFunc<\/span>(<\/span>func<\/span>(<\/span>w<\/span> http<\/span>.<\/span>ResponseWriter<\/span>,<\/span> r<\/span> *<\/span>http<\/span>.<\/span>Request<\/span>)<\/span> {<\/span>\r\n        ctx<\/span> :=<\/span> i<\/span>.<\/span>setupContext<\/span>(<\/span>r<\/span>)<\/span>\r\n        defer<\/span> log<\/span>.<\/span>Duration<\/span>(<\/span>ctx<\/span>,<\/span> time<\/span>.<\/span>Now<\/span>(),<\/span> fmt<\/span>.<\/span>Sprintf<\/span>(<\/span>\"[%s]\"<\/span>,<\/span> r<\/span>.<\/span>URL<\/span>.<\/span>Path<\/span>))<\/span>\r\n        r<\/span> =<\/span> r<\/span>.<\/span>WithContext<\/span>(<\/span>ctx<\/span>)<\/span>\r\n        next<\/span>.<\/span>ServeHTTP<\/span>(<\/span>w<\/span>,<\/span> r<\/span>)<\/span>\r\n    })<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> (<\/span>i<\/span> *<\/span>contextInjector<\/span>)<\/span> setupContext<\/span>(<\/span>r<\/span> *<\/span>http<\/span>.<\/span>Request<\/span>)<\/span> context<\/span>.<\/span>Context<\/span> {<\/span>\r\n    ctx<\/span> :=<\/span> r<\/span>.<\/span>Context<\/span>()<\/span>\r\n    ctx<\/span> =<\/span> context<\/span>.<\/span>WithValue<\/span>(<\/span>\r\n        ctx<\/span>,<\/span>\r\n        gql<\/span>.<\/span>GetUsersKey<\/span>,<\/span>\r\n        dataloader<\/span>.<\/span>NewBatchedLoader<\/span>(<\/span>gql<\/span>.<\/span>GetUsersBatchFunc<\/span>(<\/span>i<\/span>.<\/span>ur<\/span>)))<\/span>\r\n\/\/ \u7701\u7565\uff01\uff01<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
          \u52aa\u529b\u8fdb\u884c\u5e76\u884c\u5904\u7406<\/h3>\n
          \u5982\u679c\u5728Go\u4e2d\u4f7f\u7528Datastore\uff0c\u7531\u4e8e\u65e0\u6cd5\u8fdb\u884cOR\u67e5\u8be2\uff0c\u5c06\u5b83\u4eec\u5ef6\u8fdf\u8bc4\u4f30\u548c\u6279\u91cf\u5904\u7406\u53ef\u80fd\u6ca1\u6709\u610f\u4e49\u3002
          \n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u8f85\u52a9\u51fd\u6570\uff0c\u5e76\u4f7f\u7528goroutine\u5e76\u884c\u5904\u7406\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002
          \n\u5e76\u884c\u5411Datastore\u53d1\u9001\u8bf7\u6c42\u662f\u4e00\u4e2a\u60ef\u4f8b\u3002<\/p>\n
          func<\/span> concurrentResolve<\/span>(<\/span>fn<\/span> graphql<\/span>.<\/span>FieldResolveFn<\/span>)<\/span> graphql<\/span>.<\/span>FieldResolveFn<\/span> {<\/span>\r\n    return<\/span> func<\/span>(<\/span>params<\/span> graphql<\/span>.<\/span>ResolveParams<\/span>)<\/span> (<\/span>interface<\/span>{},<\/span> error<\/span>)<\/span> {<\/span>\r\n        type<\/span> result<\/span> struct<\/span> {<\/span>\r\n            data<\/span> interface<\/span>{}<\/span>\r\n            err<\/span>  error<\/span>\r\n        }<\/span>\r\n        ch<\/span> :=<\/span> make<\/span>(<\/span>chan<\/span> *<\/span>result<\/span>,<\/span> 1<\/span>)<\/span>\r\n        go<\/span> func<\/span>()<\/span> {<\/span>\r\n            defer<\/span> close<\/span>(<\/span>ch<\/span>)<\/span>\r\n            data<\/span>,<\/span> err<\/span> :=<\/span> fn<\/span>(<\/span>params<\/span>)<\/span>\r\n            ch<\/span> <-<\/span> &<\/span>result<\/span>{<\/span>data<\/span>:<\/span> data<\/span>,<\/span> err<\/span>:<\/span> err<\/span>}<\/span>\r\n        }()<\/span>\r\n        return<\/span> func<\/span>()<\/span> (<\/span>interface<\/span>{},<\/span> error<\/span>)<\/span> {<\/span>\r\n            r<\/span> :=<\/span> <-<\/span>ch<\/span>\r\n            return<\/span> r<\/span>.<\/span>data<\/span>,<\/span> r<\/span>.<\/span>err<\/span>\r\n        },<\/span> nil<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
          \u6211\u518d\u770b\u4e00\u904dTrace<\/h3>\n
          \"fast-trace.png\"<\/div>\n
          \u8fd8\u6709\u4ec0\u4e48\u4e8b\u60c5\u9700\u8981\u5b8c\u6210<\/h2>\n
          \u6211\u672c\u60f3\u4f7f\u7528Datastore\u6765\u5b9e\u73b0Relay\u5f0f\u6e38\u6807\u5206\u9875\uff0c\u4f46\u662f\u65f6\u95f4\u4e0d\u591f\u4e86\u3002<\/p>\n
          \u603b\u7ed3<\/h2>\n
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