@electric-sql/drivers/dist/wa-sqlite/database.js

ElectricSQL database drivers.

import SQLiteAsyncESMFactory from "wa-sqlite/dist/wa-sqlite-async.mjs";
import * as SQLite from "wa-sqlite";
import { IDBBatchAtomicVFS } from "wa-sqlite/src/examples/IDBBatchAtomicVFS.js";
import { Mutex } from "async-mutex";
import { resultToRows } from "../util/results.js";
class ElectricDatabase {
  // Do not use this constructor directly.
  // Create a Database instance using the static `init` method instead.
  constructor(name, sqlite3, db) {
    this.name = name;
    this.sqlite3 = sqlite3;
    this.db = db;
    this.#mutex = new Mutex();
  }
  #mutex;
  async exec(statement) {
    const release = await this.#mutex.acquire();
    try {
      return await this.execSql(statement);
    } finally {
      release();
    }
  }
  // Calls to this method must always be coordinated through the mutex
  async execSql(statement) {
    for await (const stmt of this.sqlite3.statements(this.db, statement.sql)) {
      if (typeof statement.args !== "undefined") {
        this.sqlite3.bind_collection(
          stmt,
          statement.args
        );
      }
      const rows = [];
      let cols = [];
      while (await this.sqlite3.step(stmt) === SQLite.SQLITE_ROW) {
        cols = cols.length === 0 ? this.sqlite3.column_names(stmt) : cols;
        const row = this.sqlite3.row(stmt);
        rows.push(row);
      }
      const res = {
        columns: cols,
        values: rows
      };
      return resultToRows(res);
    }
    return [];
  }
  getRowsModified() {
    return this.sqlite3.changes(this.db);
  }
  // Creates and opens a DB backed by an IndexedDB filesystem
  static async init(dbName, locateSqliteDist) {
    const locateFile = typeof locateSqliteDist === "string" ? (path) => {
      return locateSqliteDist + path;
    } : locateSqliteDist;
    const SQLiteAsyncModule = await SQLiteAsyncESMFactory({ locateFile });
    const sqlite3 = SQLite.Factory(SQLiteAsyncModule);
    sqlite3.vfs_register(new IDBBatchAtomicVFS(dbName));
    const db = await sqlite3.open_v2(
      dbName,
      SQLite.SQLITE_OPEN_CREATE | SQLite.SQLITE_OPEN_READWRITE,
      dbName
    );
    return new ElectricDatabase(dbName, sqlite3, db);
  }
}
export {
  ElectricDatabase
};
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