feat: Sqlite driver implementation

Author: paveltiunov

packages/cubejs-mysql-driver/package.json

@@ -17,5 +17,8 @@
     "generic-pool": "^3.6.0",
     "mysql": "^2.16.0"
   },
-  "license": "Apache-2.0"
+  "license": "Apache-2.0",
+  "publishConfig": {
+    "access": "public"
+  }
 }

packages/cubejs-schema-compiler/adapter/QueryBuilder.js

@@ -10,6 +10,7 @@ const snowflake = require('./SnowflakeQuery');
 const clickhouse = require('./ClickHouseQuery');
 const hive = require('./HiveQuery');
 const oracle = require('./OracleQuery');
+const sqlite = require('./SqliteQuery');
 
 const ADAPTERS = {
   postgres,
@@ -26,6 +27,7 @@ const ADAPTERS = {
   clickhouse,
   hive,
   oracle,
+  sqlite,
 };
 exports.query = (compilers, dbType, queryOptions) => {
   if (!ADAPTERS[dbType]) {

packages/cubejs-schema-compiler/adapter/SqliteQuery.js

@@ -0,0 +1,61 @@
+const moment = require('moment-timezone');
+
+const BaseQuery = require('./BaseQuery');
+const BaseFilter = require('./BaseFilter');
+
+const GRANULARITY_TO_INTERVAL = {
+  date: (date) => `strftime('%Y-%m-%dT00:00:00.000', ${date})`,
+  week: (date) => `strftime('%Y-%m-%dT00:00:00.000', CASE WHEN date(${date}, 'weekday 1') = date(${date}) THEN date(${date}, 'weekday 1') ELSE date(${date}, 'weekday 1', '-7 days') END)`,
+  hour: (date) => `strftime('%Y-%m-%dT%H:00:00.000', ${date})`,
+  month: (date) => `strftime('%Y-%m-01T00:00:00.000', ${date})`,
+  year: (date) => `strftime('%Y-01-01T00:00:00.000', ${date})`
+};
+
+class SqliteFilter extends BaseFilter {
+  likeIgnoreCase(column, not) {
+    return `${column}${not ? ' NOT' : ''} LIKE '%' || ? || '%' COLLATE NOCASE`;
+  }
+}
+
+class SqliteQuery extends BaseQuery {
+  newFilter(filter) {
+    return new SqliteFilter(this, filter);
+  }
+
+  convertTz(field) {
+    return `${this.timeStampCast(field)} || '${
+      moment().tz(this.timezone).format('Z')
+        .replace('-', '+')
+        .replace('+', '-')
+    }'`;
+  }
+
+  timeStampCast(value) {
+    return `strftime('%Y-%m-%dT%H:%M:%f', ${value})`;
+  }
+
+  dateTimeCast(value) {
+    return `strftime('%Y-%m-%dT%H:%M:%f', ${value})`;
+  }
+
+  subtractInterval(date, interval) {
+    return `strftime('%Y-%m-%dT%H:%M:%f', ${date}, '${interval.replace('-', '+').replace(/(^\+|^)/, '-')}')`;
+  }
+
+  addInterval(date, interval) {
+    return `strftime('%Y-%m-%dT%H:%M:%f', ${date}, '${interval}')`;
+  }
+
+  timeGroupedColumn(granularity, dimension) {
+    return GRANULARITY_TO_INTERVAL[granularity](dimension);
+  }
+
+  seriesSql(timeDimension) {
+    const values = timeDimension.timeSeries().map(
+      ([from, to]) => `select '${from}' f, '${to}' t`
+    ).join(' UNION ALL ');
+    return `SELECT dates.f date_from, dates.t date_to FROM (${values}) AS dates`;
+  }
+}
+
+module.exports = SqliteQuery;

packages/cubejs-server-core/core/index.js

@@ -23,6 +23,7 @@ const DriverDependencies = {
   snowflake: '@cubejs-backend/snowflake-driver',
   prestodb: '@cubejs-backend/prestodb-driver',
   oracle: '@cubejs-backend/oracle-driver',
+  sqlite: '@cubejs-backend/sqlite-driver',
 };
 
 const checkEnvForPlaceholders = () => {

packages/cubejs-sqlite-driver/LICENSE

@@ -0,0 +1,202 @@
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packages/cubejs-sqlite-driver/README.md

@@ -0,0 +1,16 @@
+<p align="center"><a href="https://cube.dev"><img src="https://i.imgur.com/zYHXm4o.png" alt="Cube.js" width="300px"></a></p>
+
+[Website](https://cube.dev) • [Docs](https://cube.dev/docs) • [Blog](https://cube.dev/blog) • [Slack](https://slack.cube.dev) • [Twitter](https://twitter.com/thecubejs)
+
+[![npm version](https://badge.fury.io/js/%40cubejs-backend%2Fserver.svg)](https://badge.fury.io/js/%40cubejs-backend%2Fserver)
+[![CircleCI](https://circleci.com/gh/cube-js/cube.js.svg?style=shield)](https://circleci.com/gh/cube-js/cube.js)
+
+# Cube.js Sqlite Database Driver
+
+Sqlite driver.
+
+[Learn more](https://github.com/cube-js/cube.js#getting-started)
+
+### License
+
+Cube.js Sqlite Database Driver is [Apache 2.0 licensed](./LICENSE).

packages/cubejs-sqlite-driver/driver/SqliteDriver.js

@@ -0,0 +1,61 @@
+const sqlite3 = require('sqlite3');
+const BaseDriver = require('@cubejs-backend/query-orchestrator/driver/BaseDriver');
+
+class SqliteDriver extends BaseDriver {
+  constructor(config) {
+    super();
+    this.config = {
+      database: process.env.CUBEJS_DB_NAME,
+      ...config
+    };
+    if (!this.config.db) {
+      this.config.db = new sqlite3.Database(this.config.database);
+    }
+  }
+
+  async testConnection() {
+    return this.query('SELECT 1');
+  }
+
+  query(query, values) {
+    return new Promise(
+      (resolve, reject) => this.config.db.all(
+        query,
+        values || [],
+        (err, result) => (err ? reject(err) : resolve(result))
+      )
+    );
+  }
+
+  async release() {
+    await new Promise((resolve, reject) => this.config.db.close((err) => (err ? reject(err) : resolve())));
+  }
+
+  informationSchemaQuery() {
+    return `
+      SELECT name, sql
+      FROM sqlite_master
+      WHERE type='table'
+      ORDER BY name
+   `;
+  }
+
+  async tablesSchema() {
+    const query = this.informationSchemaQuery();
+
+    const tables = await this.query(query);
+
+    return {
+      default: {
+        ...(tables.map(
+          table => ({
+            [table.name]: table.sql.match(/\((.*)\)/)[1].split(',')
+              .map(nameAndType => nameAndType.trim().split(' ')).map(([name, type]) => ({ name, type }))
+          })
+        )).reduce((a, b) => ({ ...a, ...b }), {})
+      }
+    };
+  }
+}
+
+module.exports = SqliteDriver;