refactor PreAggregations: move every class to a separate file

packages/cubejs-query-orchestrator/src/orchestrator/PreAggregationLoadCache.ts

@@ -0,0 +1,245 @@
+import { TableStructure } from '@cubejs-backend/base-driver';
+import { DriverFactory } from './DriverFactory';
+import { QueryCache, QueryTuple, QueryWithParams } from './QueryCache';
+import {
+  PreAggregationDescription,
+  PreAggregations,
+  TableCacheEntry,
+  tablesToVersionEntries,
+  VersionEntriesObj,
+  VersionEntry
+} from './PreAggregations';
+
+type PreAggregationLoadCacheOptions = {
+  requestId?: string,
+  dataSource: string,
+  tablePrefixes?: string[],
+};
+
+export class PreAggregationLoadCache {
+  private driverFactory: DriverFactory;
+
+  private queryCache: QueryCache;
+
+  // eslint-disable-next-line no-use-before-define
+  private preAggregations: PreAggregations;
+
+  private queryResults: any;
+
+  private externalDriverFactory: any;
+
+  private requestId: any;
+
+  private versionEntries: { [redisKey: string]: Promise<VersionEntriesObj> };
+
+  private tables: { [redisKey: string]: TableCacheEntry[] };
+
+  private tableColumnTypes: { [cacheKey: string]: { [tableName: string]: TableStructure } };
+
+  // TODO this is in memory cache structure as well however it depends on
+  // data source only and load cache is per data source for now.
+  // Make it per data source key in case load cache scope is broaden.
+  private queryStageState: any;
+
+  private dataSource: string;
+
+  private tablePrefixes: string[] | null;
+
+  public constructor(
+    clientFactory: DriverFactory,
+    queryCache,
+    preAggregations,
+    options: PreAggregationLoadCacheOptions = { dataSource: 'default' }
+  ) {
+    this.dataSource = options.dataSource;
+    this.driverFactory = clientFactory;
+    this.queryCache = queryCache;
+    this.preAggregations = preAggregations;
+    this.queryResults = {};
+    this.externalDriverFactory = preAggregations.externalDriverFactory;
+    this.requestId = options.requestId;
+    this.tablePrefixes = options.tablePrefixes;
+    this.versionEntries = {};
+    this.tables = {};
+    this.tableColumnTypes = {};
+  }
+
+  protected async tablesFromCache(preAggregation, forceRenew?) {
+    let tables = forceRenew ? null : await this.queryCache.getCacheDriver().get(this.tablesCachePrefixKey(preAggregation));
+    if (!tables) {
+      tables = await this.preAggregations.getLoadCacheQueue(this.dataSource).executeInQueue(
+        'query',
+        `Fetch tables for ${preAggregation.preAggregationsSchema}`,
+        {
+          preAggregation, requestId: this.requestId
+        },
+        0,
+        { requestId: this.requestId }
+      );
+    }
+    return tables;
+  }
+
+  public async fetchTables(preAggregation: PreAggregationDescription) {
+    if (preAggregation.external && !this.externalDriverFactory) {
+      throw new Error('externalDriverFactory is not provided. Please use CUBEJS_DEV_MODE=true or provide Cube Store connection env variables for production usage.');
+    }
+
+    const newTables = await this.fetchTablesNoCache(preAggregation);
+    await this.queryCache.getCacheDriver().set(
+      this.tablesCachePrefixKey(preAggregation),
+      newTables,
+      this.preAggregations.options.preAggregationsSchemaCacheExpire || 60 * 60
+    );
+    return newTables;
+  }
+
+  private async fetchTablesNoCache(preAggregation: PreAggregationDescription) {
+    const client = preAggregation.external ?
+      await this.externalDriverFactory() :
+      await this.driverFactory();
+    if (this.tablePrefixes && client.getPrefixTablesQuery && this.preAggregations.options.skipExternalCacheAndQueue) {
+      return client.getPrefixTablesQuery(preAggregation.preAggregationsSchema, this.tablePrefixes);
+    }
+    return client.getTablesQuery(preAggregation.preAggregationsSchema);
+  }
+
+  public tablesCachePrefixKey(preAggregation: PreAggregationDescription) {
+    return this.queryCache.getKey('SQL_PRE_AGGREGATIONS_TABLES', `${preAggregation.dataSource}${preAggregation.preAggregationsSchema}${preAggregation.external ? '_EXT' : ''}`);
+  }
+
+  protected async getTablesQuery(preAggregation) {
+    const redisKey = this.tablesCachePrefixKey(preAggregation);
+    if (!this.tables[redisKey]) {
+      const tables = this.preAggregations.options.skipExternalCacheAndQueue && preAggregation.external ?
+        await this.fetchTablesNoCache(preAggregation) :
+        await this.tablesFromCache(preAggregation);
+      if (tables === undefined) {
+        throw new Error('Pre-aggregation tables are undefined.');
+      }
+      this.tables[redisKey] = tables;
+    }
+    return this.tables[redisKey];
+  }
+
+  public async getTableColumnTypes(preAggregation: PreAggregationDescription, tableName: string): Promise<TableStructure> {
+    const prefixKey = this.tablesCachePrefixKey(preAggregation);
+    if (!this.tableColumnTypes[prefixKey]?.[tableName]) {
+      if (!this.preAggregations.options.skipExternalCacheAndQueue && preAggregation.external) {
+        throw new Error(`Lambda union with source data feature is supported only by external rollups stored in Cube Store but was invoked for '${preAggregation.preAggregationId}'`);
+      }
+      const client = await this.externalDriverFactory();
+      const columnTypes = await client.tableColumnTypes(tableName);
+      if (!this.tableColumnTypes[prefixKey]) {
+        this.tableColumnTypes[prefixKey] = {};
+      }
+      this.tableColumnTypes[prefixKey][tableName] = columnTypes;
+    }
+    return this.tableColumnTypes[prefixKey][tableName];
+  }
+
+  private async calculateVersionEntries(preAggregation): Promise<VersionEntriesObj> {
+    let versionEntries = tablesToVersionEntries(
+      preAggregation.preAggregationsSchema,
+      await this.getTablesQuery(preAggregation)
+    );
+    // It presumes strong consistency guarantees for external pre-aggregation tables ingestion
+    if (!preAggregation.external) {
+      // eslint-disable-next-line
+      const [active, toProcess, queries] = await this.fetchQueryStageState();
+      const targetTableNamesInQueue = (Object.keys(queries))
+        // eslint-disable-next-line no-use-before-define
+        .map(q => PreAggregations.targetTableName(queries[q].query.newVersionEntry));
+
+      versionEntries = versionEntries.filter(
+        // eslint-disable-next-line no-use-before-define
+        e => targetTableNamesInQueue.indexOf(PreAggregations.targetTableName(e)) === -1
+      );
+    }
+
+    const byContent: { [key: string]: VersionEntry } = {};
+    const byStructure: { [key: string]: VersionEntry } = {};
+    const byTableName: { [key: string]: VersionEntry } = {};
+
+    versionEntries.forEach(e => {
+      const contentKey = `${e.table_name}_${e.content_version}`;
+      if (!byContent[contentKey]) {
+        byContent[contentKey] = e;
+      }
+      const structureKey = `${e.table_name}_${e.structure_version}`;
+      if (!byStructure[structureKey]) {
+        byStructure[structureKey] = e;
+      }
+      if (!byTableName[e.table_name]) {
+        byTableName[e.table_name] = e;
+      }
+    });
+
+    return { versionEntries, byContent, byStructure, byTableName };
+  }
+
+  public async getVersionEntries(preAggregation): Promise<VersionEntriesObj> {
+    if (this.tablePrefixes && !this.tablePrefixes.find(p => preAggregation.tableName.split('.')[1].startsWith(p))) {
+      throw new Error(`Load cache tries to load table ${preAggregation.tableName} outside of tablePrefixes filter: ${this.tablePrefixes.join(', ')}`);
+    }
+    const redisKey = this.tablesCachePrefixKey(preAggregation);
+    if (!this.versionEntries[redisKey]) {
+      this.versionEntries[redisKey] = this.calculateVersionEntries(preAggregation).catch(e => {
+        delete this.versionEntries[redisKey];
+        throw e;
+      });
+    }
+    return this.versionEntries[redisKey];
+  }
+
+  public async keyQueryResult(sqlQuery: QueryWithParams, waitForRenew: boolean, priority: number) {
+    const [query, values, queryOptions]: QueryTuple = Array.isArray(sqlQuery) ? sqlQuery : [sqlQuery, [], {}];
+
+    if (!this.queryResults[this.queryCache.queryRedisKey([query, values])]) {
+      this.queryResults[this.queryCache.queryRedisKey([query, values])] = await this.queryCache.cacheQueryResult(
+        query,
+        <string[]>values,
+        [query, <string[]>values],
+        60 * 60,
+        {
+          renewalThreshold: this.queryCache.options.refreshKeyRenewalThreshold
+            || queryOptions?.renewalThreshold || 2 * 60,
+          renewalKey: [query, values],
+          waitForRenew,
+          priority,
+          requestId: this.requestId,
+          dataSource: this.dataSource,
+          useInMemory: true,
+          external: queryOptions?.external
+        }
+      );
+    }
+    return this.queryResults[this.queryCache.queryRedisKey([query, values])];
+  }
+
+  public hasKeyQueryResult(keyQuery) {
+    return !!this.queryResults[this.queryCache.queryRedisKey(keyQuery)];
+  }
+
+  public async getQueryStage(stageQueryKey) {
+    const queue = await this.preAggregations.getQueue(this.dataSource);
+    await this.fetchQueryStageState(queue);
+    return queue.getQueryStage(stageQueryKey, undefined, this.queryStageState);
+  }
+
+  protected async fetchQueryStageState(queue?) {
+    queue = queue || await this.preAggregations.getQueue(this.dataSource);
+    if (!this.queryStageState) {
+      this.queryStageState = await queue.fetchQueryStageState();
+    }
+    return this.queryStageState;
+  }
+
+  public async reset(preAggregation) {
+    await this.tablesFromCache(preAggregation, true);
+    this.tables = {};
+    this.tableColumnTypes = {};
+    this.queryStageState = undefined;
+    this.versionEntries = {};
+  }
+}