通过对与cube 配置的json schema 学习我们可以知道cube.js 都包含了那些扩展点，可以方便系统的扩容以及优化
内容
const schemaOptions = Joi.object().keys({// server CreateOptions
initApp: Joi.func(),
webSockets: Joi.boolean(),
http: Joi.object().keys({cors: Joi.object(),
}),
gracefulShutdown: Joi.number().min(0).integer(),
// Additional from WebSocketServerOptions
processSubscriptionsInterval: Joi.number(),
webSocketsBasePath: Joi.string(),
// server-core CoreCreateOptions
dbType: dbTypes,
externalDbType: dbTypes,
schemaPath: Joi.string(),
basePath: Joi.string(),
devServer: Joi.boolean(),
apiSecret: Joi.string(),
logger: Joi.func(),
// source
dialectFactory: Joi.func(),
driverFactory: Joi.func(),
// external
externalDialectFactory: Joi.func(),
externalDriverFactory: Joi.func(),
//
cacheAndQueueDriver: Joi.string().valid('redis', 'memory'),contextToAppId: Joi.func(),
contextToOrchestratorId: Joi.func(),
contextToDataSourceId: Joi.func(),
repositoryFactory: Joi.func(),
checkAuth: Joi.func(),
checkAuthMiddleware: Joi.func(),
jwt: jwtOptions,
queryTransformer: Joi.func(),
queryRewrite: Joi.func(),
preAggregationsSchema: Joi.alternatives().try(
Joi.string(),
Joi.func()
),
schemaVersion: Joi.func(),
extendContext: Joi.func(),
// Scheduled refresh
scheduledRefreshTimer: Joi.alternatives().try(
Joi.boolean(),
Joi.number().min(0).integer()
),
scheduledRefreshTimeZones: Joi.array().items(Joi.string()),
scheduledRefreshContexts: Joi.func(),
scheduledRefreshConcurrency: Joi.number().min(1).integer(),
// Compiler cache
compilerCacheSize: Joi.number().min(0).integer(),
updateCompilerCacheKeepAlive: Joi.boolean(),
maxCompilerCacheKeepAlive: Joi.number().min(0).integer(),
telemetry: Joi.boolean(),
allowUngroupedWithoutPrimaryKey: Joi.boolean(),
orchestratorOptions: Joi.alternatives().try(
Joi.func(),
Joi.object().keys({redisPrefix: Joi.string().allow(''),redisPoolOptions: Joi.object().keys({poolMin: Joi.number().min(0),
poolMax: Joi.number().min(0),
idleTimeoutSeconds: Joi.number().min(0),
softIdleTimeoutSeconds: Joi.number().min(0),
createClient: Joi.func(),
destroyClient: Joi.func(),
poolOptions: Joi.object().keys({maxWaitingClients: Joi.number(),
testOnBorrow: Joi.bool(),
testOnReturn: Joi.bool(),
acquireTimeoutMillis: Joi.number(),
fifo: Joi.bool(),
priorityRange: Joi.number(),
autostart: Joi.bool(),
evictionRunIntervalMillis: Joi.number().min(0),
numTestsPerEvictionRun: Joi.number().min(1),
softIdleTimeoutMillis: Joi.number().min(0),
idleTimeoutMillis: Joi.number().min(0),
})
}),
continueWaitTimeout: Joi.number().min(0).integer(),
skipExternalCacheAndQueue: Joi.boolean(),
queryCacheOptions: Joi.object().keys({refreshKeyRenewalThreshold: Joi.number().min(0).integer(),
backgroundRenew: Joi.boolean(),
queueOptions: schemaQueueOptions,
externalQueueOptions: schemaQueueOptions
}),
preAggregationsOptions: {queueOptions: schemaQueueOptions,
externalRefresh: Joi.boolean(),
},
rollupOnlyMode: Joi.boolean()
})
),
allowJsDuplicatePropsInSchema: Joi.boolean(),
dashboardAppPath: Joi.string(),
dashboardAppPort: Joi.number(),
sqlCache: Joi.boolean(),
livePreview: Joi.boolean(),
// SQL API
sqlPort: Joi.number(),
pgSqlPort: Joi.number(),
checkSqlAuth: Joi.func(),
sqlUser: Joi.string(),
sqlPassword: Joi.string(),
// Additional system flags
serverless: Joi.boolean(),
allowNodeRequire: Joi.boolean(),
});