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Your IP : 3.17.57.190
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{ ObjectLiteral } from \"../common/ObjectLiteral\"\nimport { DataSource } from \"../data-source/DataSource\"\nimport { MssqlParameter } from \"../driver/sqlserver/MssqlParameter\"\nimport { QueryRunner } from \"../query-runner/QueryRunner\"\nimport { Table } from \"../schema-builder/table/Table\"\nimport { QueryResultCache } from \"./QueryResultCache\"\nimport { QueryResultCacheOptions } from \"./QueryResultCacheOptions\"\nimport { v4 as uuidv4 } from \"uuid\"\n\n/**\n * Caches query result into current database, into separate table called \"query-result-cache\".\n */\nexport class DbQueryResultCache implements QueryResultCache {\n // -------------------------------------------------------------------------\n // Private properties\n // -------------------------------------------------------------------------\n\n private queryResultCacheTable: string\n\n private queryResultCacheDatabase?: string\n\n private queryResultCacheSchema?: string\n\n // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(protected connection: DataSource) {\n const { schema } = this.connection.driver.options as any\n const database = this.connection.driver.database\n const cacheOptions =\n typeof this.connection.options.cache === \"object\"\n ? this.connection.options.cache\n : {}\n const cacheTableName = cacheOptions.tableName || \"query-result-cache\"\n\n this.queryResultCacheDatabase = database\n this.queryResultCacheSchema = schema\n this.queryResultCacheTable = this.connection.driver.buildTableName(\n cacheTableName,\n schema,\n database,\n )\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Creates a connection with given cache provider.\n */\n async connect(): Promise<void> {}\n\n /**\n * Disconnects with given cache provider.\n */\n async disconnect(): Promise<void> {}\n\n /**\n * Creates table for storing cache if it does not exist yet.\n */\n async synchronize(queryRunner?: QueryRunner): Promise<void> {\n queryRunner = this.getQueryRunner(queryRunner)\n const driver = this.connection.driver\n const tableExist = await queryRunner.hasTable(\n this.queryResultCacheTable,\n ) // todo: table name should be configurable\n if (tableExist) return\n\n await queryRunner.createTable(\n new Table({\n database: this.queryResultCacheDatabase,\n schema: this.queryResultCacheSchema,\n name: this.queryResultCacheTable,\n columns: [\n {\n name: \"id\",\n isPrimary: true,\n isNullable: false,\n type: driver.normalizeType({\n type: driver.mappedDataTypes.cacheId,\n }),\n generationStrategy:\n driver.options.type === \"spanner\"\n ? \"uuid\"\n : \"increment\",\n isGenerated: true,\n },\n {\n name: \"identifier\",\n type: driver.normalizeType({\n type: driver.mappedDataTypes.cacheIdentifier,\n }),\n isNullable: true,\n },\n {\n name: \"time\",\n type: driver.normalizeType({\n type: driver.mappedDataTypes.cacheTime,\n }),\n isPrimary: false,\n isNullable: false,\n },\n {\n name: \"duration\",\n type: driver.normalizeType({\n type: driver.mappedDataTypes.cacheDuration,\n }),\n isPrimary: false,\n isNullable: false,\n },\n {\n name: \"query\",\n type: driver.normalizeType({\n type: driver.mappedDataTypes.cacheQuery,\n }),\n isPrimary: false,\n isNullable: false,\n },\n {\n name: \"result\",\n type: driver.normalizeType({\n type: driver.mappedDataTypes.cacheResult,\n }),\n isNullable: false,\n },\n ],\n }),\n )\n }\n\n /**\n * Get data from cache.\n * Returns cache result if found.\n * Returns undefined if result is not cached.\n */\n getFromCache(\n options: QueryResultCacheOptions,\n queryRunner?: QueryRunner,\n ): Promise<QueryResultCacheOptions | undefined> {\n queryRunner = this.getQueryRunner(queryRunner)\n const qb = this.connection\n .createQueryBuilder(queryRunner)\n .select()\n .from(this.queryResultCacheTable, \"cache\")\n\n if (options.identifier) {\n return qb\n .where(\n `${qb.escape(\"cache\")}.${qb.escape(\n \"identifier\",\n )} = :identifier`,\n )\n .setParameters({\n identifier:\n this.connection.driver.options.type === \"mssql\"\n ? new MssqlParameter(options.identifier, \"nvarchar\")\n : options.identifier,\n })\n .cache(false) // disable cache to avoid infinite loops when cache is alwaysEnable\n .getRawOne()\n } else if (options.query) {\n if (this.connection.driver.options.type === \"oracle\") {\n return qb\n .where(\n `dbms_lob.compare(${qb.escape(\"cache\")}.${qb.escape(\n \"query\",\n )}, :query) = 0`,\n { query: options.query },\n )\n .cache(false) // disable cache to avoid infinite loops when cache is alwaysEnable\n .getRawOne()\n }\n\n return qb\n .where(`${qb.escape(\"cache\")}.${qb.escape(\"query\")} = :query`)\n .setParameters({\n query:\n this.connection.driver.options.type === \"mssql\"\n ? new MssqlParameter(options.query, \"nvarchar\")\n : options.query,\n })\n .cache(false) // disable cache to avoid infinite loops when cache is alwaysEnable\n .getRawOne()\n }\n\n return Promise.resolve(undefined)\n }\n\n /**\n * Checks if cache is expired or not.\n */\n isExpired(savedCache: QueryResultCacheOptions): boolean {\n const duration =\n typeof savedCache.duration === \"string\"\n ? parseInt(savedCache.duration)\n : savedCache.duration\n return (\n (typeof savedCache.time === \"string\"\n ? parseInt(savedCache.time as any)\n : savedCache.time)! +\n duration <\n new Date().getTime()\n )\n }\n\n /**\n * Stores given query result in the cache.\n */\n async storeInCache(\n options: QueryResultCacheOptions,\n savedCache: QueryResultCacheOptions | undefined,\n queryRunner?: QueryRunner,\n ): Promise<void> {\n const shouldCreateQueryRunner =\n queryRunner === undefined ||\n queryRunner?.getReplicationMode() === \"slave\"\n\n if (queryRunner === undefined || shouldCreateQueryRunner) {\n queryRunner = this.connection.createQueryRunner(\"master\")\n }\n\n let insertedValues: ObjectLiteral = options\n if (this.connection.driver.options.type === \"mssql\") {\n // todo: bad abstraction, re-implement this part, probably better if we create an entity metadata for cache table\n insertedValues = {\n identifier: new MssqlParameter(options.identifier, \"nvarchar\"),\n time: new MssqlParameter(options.time, \"bigint\"),\n duration: new MssqlParameter(options.duration, \"int\"),\n query: new MssqlParameter(options.query, \"nvarchar\"),\n result: new MssqlParameter(options.result, \"nvarchar\"),\n }\n }\n\n if (savedCache && savedCache.identifier) {\n // if exist then update\n const qb = queryRunner.manager\n .createQueryBuilder()\n .update(this.queryResultCacheTable)\n .set(insertedValues)\n\n qb.where(`${qb.escape(\"identifier\")} = :condition`, {\n condition: insertedValues.identifier,\n })\n await qb.execute()\n } else if (savedCache && savedCache.query) {\n // if exist then update\n const qb = queryRunner.manager\n .createQueryBuilder()\n .update(this.queryResultCacheTable)\n .set(insertedValues)\n\n if (this.connection.driver.options.type === \"oracle\") {\n qb.where(`dbms_lob.compare(\"query\", :condition) = 0`, {\n condition: insertedValues.query,\n })\n } else {\n qb.where(`${qb.escape(\"query\")} = :condition`, {\n condition: insertedValues.query,\n })\n }\n\n await qb.execute()\n } else {\n // Spanner does not support auto-generated columns\n if (\n this.connection.driver.options.type === \"spanner\" &&\n !insertedValues.id\n ) {\n insertedValues.id = uuidv4()\n }\n\n // otherwise insert\n await queryRunner.manager\n .createQueryBuilder()\n .insert()\n .into(this.queryResultCacheTable)\n .values(insertedValues)\n .execute()\n }\n\n if (shouldCreateQueryRunner) {\n await queryRunner.release()\n }\n }\n\n /**\n * Clears everything stored in the cache.\n */\n async clear(queryRunner: QueryRunner): Promise<void> {\n return this.getQueryRunner(queryRunner).clearTable(\n this.queryResultCacheTable,\n )\n }\n\n /**\n * Removes all cached results by given identifiers from cache.\n */\n async remove(\n identifiers: string[],\n queryRunner?: QueryRunner,\n ): Promise<void> {\n let _queryRunner: QueryRunner = queryRunner || this.getQueryRunner()\n await Promise.all(\n identifiers.map((identifier) => {\n const qb = _queryRunner.manager.createQueryBuilder()\n return qb\n .delete()\n .from(this.queryResultCacheTable)\n .where(`${qb.escape(\"identifier\")} = :identifier`, {\n identifier,\n })\n .execute()\n }),\n )\n\n if (!queryRunner) {\n await _queryRunner.release()\n }\n }\n\n // -------------------------------------------------------------------------\n // Protected Methods\n // -------------------------------------------------------------------------\n\n /**\n * Gets a query runner to work with.\n */\n protected getQueryRunner(queryRunner?: QueryRunner): QueryRunner {\n if (queryRunner) return queryRunner\n\n return this.connection.createQueryRunner()\n }\n}\n"],"sourceRoot":".."}