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PawSQLite-WebSQL-Adapter
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Ben Ashton 3 years ago
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  1. 2
      .gitignore
  2. 444
      lib/pawsqlite-websql-adapter.js
  3. 1
      lib/pawsqlite-websql-adapter.js.map
  4. 1030
      package-lock.json
  5. 20
      package.json
  6. 30
      src/database_wrapper.mjs
  7. 14
      src/log.mjs
  8. 8
      src/response_wrapper.mjs
  9. 22
      src/result_mapper.mjs
  10. 156
      src/transaction_manager.mjs
  11. 41
      src/websql_adapter.mjs
  12. 9
      src/websql_adapter_error.mjs
  13. 18
      webpack.config.js

2
.gitignore vendored
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node_modules
.jshintrc

444
lib/pawsqlite-websql-adapter.js
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/******/ (() => { // webpackBootstrap
/******/ "use strict";
/******/ var __webpack_modules__ = ({
/***/ "./src/database_wrapper.mjs":
/*!**********************************!*\
!*** ./src/database_wrapper.mjs ***!
\**********************************/
/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */ "DatabaseWrapper": () => (/* binding */ DatabaseWrapper)
/* harmony export */ });
/* harmony import */ var _transaction_manager_mjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./transaction_manager.mjs */ "./src/transaction_manager.mjs");
class DatabaseWrapper {
constructor(dbName, version) {
this.name = dbName;
this.db = openDatabase(this.name, version, "", 5 * 1024 * 1024);
this.transManager = new _transaction_manager_mjs__WEBPACK_IMPORTED_MODULE_0__.TransactionManager(this.db);
}
sql(sql, ...args) {
const reg = /^\s*(BEGIN|END|COMMIT|ROLLBACK)(?:[^A-Z]|$)/i;
const match = reg.exec(sql);
if (match) {
const statement = match[1].toUpperCase();
switch(statement) {
case "BEGIN":
return this.transManager.begin();
case "END":
case "COMMIT":
return this.transManager.commit();
case "ROLLBACK":
return this.transManager.rollback();
}
} else {
return this.transManager.sql(sql, args);
}
}
}
/***/ }),
/***/ "./src/log.mjs":
/*!*********************!*\
!*** ./src/log.mjs ***!
\*********************/
/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */ "log": () => (/* binding */ log),
/* harmony export */ "enableDebug": () => (/* binding */ enableDebug)
/* harmony export */ });
let DEBUG = false;
function log(...args) {
if (DEBUG) {
console.log(...args);
}
}
function enableDebug(active) {
DEBUG = !!active;
log("PawSQLite-WebSQL-Adapter: debugging " + (
DEBUG ? "enabled" : "disabled")
);
}
/***/ }),
/***/ "./src/response_wrapper.mjs":
/*!**********************************!*\
!*** ./src/response_wrapper.mjs ***!
\**********************************/
/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */ "ResponseWrapper": () => (/* binding */ ResponseWrapper)
/* harmony export */ });
const ResponseWrapper = {
success: (obj = {}) => ({
success: true,
...obj
})
};
/***/ }),
/***/ "./src/result_mapper.mjs":
/*!*******************************!*\
!*** ./src/result_mapper.mjs ***!
\*******************************/
/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */ "mapResult": () => (/* binding */ mapResult)
/* harmony export */ });
function mapResult(originalResult) {
const newResult = {};
if (!originalResult) {
return newResult;
}
try {
newResult.insertId = originalResult.insertId;
} catch (e) {}
newResult.rowsAffected = originalResult.rowsAffected;
if ("rows" in originalResult) {
newResult.rows = [];
for (let i = 0; i < originalResult.rows.length; i++) {
newResult.rows.push(originalResult.rows.item(i));
}
}
return newResult;
}
/***/ }),
/***/ "./src/transaction_manager.mjs":
/*!*************************************!*\
!*** ./src/transaction_manager.mjs ***!
\*************************************/
/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */ "TransactionManager": () => (/* binding */ TransactionManager)
/* harmony export */ });
/* harmony import */ var _websql_adapter_error_mjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./websql_adapter_error.mjs */ "./src/websql_adapter_error.mjs");
/* harmony import */ var _result_mapper_mjs__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(/*! ./result_mapper.mjs */ "./src/result_mapper.mjs");
/* harmony import */ var _log_mjs__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(/*! ./log.mjs */ "./src/log.mjs");
class Task {
constructor(job, startsTransaction=false, endsTransaction=false) {
this._job = job;
if (startsTransaction && endsTransaction) {
throw new Error("Task cannot start and end a transaction.");
}
this.startsTransaction = startsTransaction;
this.endsTransaction = endsTransaction;
this.result = new Promise ((resolve, reject) => {
this._resolve = resolve;
this._reject = reject;
});
}
run(tx) {
return this._job(tx).then((result) => {
this._resolve(result);
return result;
}, (e) => {
this._reject(e);
});
}
}
class TransactionManager {
constructor(db) {
this.db = db;
this._txCount = 0;
this._tasks = [];
this._processing = false;
}
begin() {
return this._addTask(new Task((tx) => {
return new Promise((resolve, reject) => {
if (tx) {
reject(new _websql_adapter_error_mjs__WEBPACK_IMPORTED_MODULE_0__.WebSQLAdapterError("BEGIN called with an active " +
"transaction. This should not happen"));
return;
}
this.db.transaction((tx) => {
resolve(tx);
});
});
}, true)).then(() => (0,_result_mapper_mjs__WEBPACK_IMPORTED_MODULE_1__.mapResult)());
}
sql(sql, args = []) {
return this._addTask(new Task((tx) => {
return this._executeSql(tx, sql, args);
}));
}
commit() {
return this._addTask(new Task((tx) => {
return Promise.resolve((0,_result_mapper_mjs__WEBPACK_IMPORTED_MODULE_1__.mapResult)());
}, false, true));
}
rollback() {
// Hack to manually cause rollback:
// Intentionally cause an error with rollbackOnError set to true
return this._addTask(new Task((tx) => {
return this._executeSql(tx, "", [], true).catch(() => (0,_result_mapper_mjs__WEBPACK_IMPORTED_MODULE_1__.mapResult)());
}, false, true));
}
async _process() {
if (this._processing) {
return;
}
this._processing = true;
let tx = null;
let keepaliveCount = 0;
while (true) {
const tasks = this._tasks;
this._tasks = [];
if (tasks.length) {
const promises = [];
for (const task of tasks) {
const promise = task.run(tx);
if (task.startsTransaction) {
tx = await promise;
this._txCount++;
} else {
if (task.endsTransaction) {
tx = null;
keepaliveCount = 0;
}
promises.push(promise);
}
}
await Promise.all(promises);
} else {
if (tx) {
await this._nop(tx);
keepaliveCount++;
if (keepaliveCount % 5000 === 0) {
(0,_log_mjs__WEBPACK_IMPORTED_MODULE_2__.log)(`Transaction: ${ this._txCount } Keepalive: #${ keepaliveCount }`);
}
} else {
break;
}
}
}
this._processing = false;
}
_addTask(task) {
this._tasks.push(task);
this._process();
return task.result;
}
_executeSql(tx, sql, sqlArgs = [], rollbackOnError = false) {
return new Promise((resolve, reject) => {
if (!tx) {
reject(new _websql_adapter_error_mjs__WEBPACK_IMPORTED_MODULE_0__.WebSQLAdapterError("No transaction. This should not be " +
" possible"));
return;
}
tx.executeSql(sql, sqlArgs, (tx, result) => {
resolve((0,_result_mapper_mjs__WEBPACK_IMPORTED_MODULE_1__.mapResult)(result));
}, (tx, e) => {
reject(_websql_adapter_error_mjs__WEBPACK_IMPORTED_MODULE_0__.WebSQLAdapterError.from(e));
return rollbackOnError;
});
});
}
_nop(tx) {
return this._executeSql(tx, "SELECT 1");
}
}
/***/ }),
/***/ "./src/websql_adapter_error.mjs":
/*!**************************************!*\
!*** ./src/websql_adapter_error.mjs ***!
\**************************************/
/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */ "WebSQLAdapterError": () => (/* binding */ WebSQLAdapterError)
/* harmony export */ });
class WebSQLAdapterError extends Error {
static from(e) {
let message = "";
if (e && e.message) {
message = e.message;
}
return new WebSQLAdapterError(message);
}
}
/***/ })
/******/ });
/************************************************************************/
/******/ // The module cache
/******/ var __webpack_module_cache__ = {};
/******/
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
/******/ // Check if module is in cache
/******/ if(__webpack_module_cache__[moduleId]) {
/******/ return __webpack_module_cache__[moduleId].exports;
/******/ }
/******/ // Create a new module (and put it into the cache)
/******/ var module = __webpack_module_cache__[moduleId] = {
/******/ // no module.id needed
/******/ // no module.loaded needed
/******/ exports: {}
/******/ };
/******/
/******/ // Execute the module function
/******/ __webpack_modules__[moduleId](module, module.exports, __webpack_require__);
/******/
/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
/******/
/************************************************************************/
/******/ /* webpack/runtime/define property getters */
/******/ (() => {
/******/ // define getter functions for harmony exports
/******/ __webpack_require__.d = (exports, definition) => {
/******/ for(var key in definition) {
/******/ if(__webpack_require__.o(definition, key) && !__webpack_require__.o(exports, key)) {
/******/ Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });
/******/ }
/******/ }
/******/ };
/******/ })();
/******/
/******/ /* webpack/runtime/hasOwnProperty shorthand */
/******/ (() => {
/******/ __webpack_require__.o = (obj, prop) => (Object.prototype.hasOwnProperty.call(obj, prop))
/******/ })();
/******/
/******/ /* webpack/runtime/make namespace object */
/******/ (() => {
/******/ // define __esModule on exports
/******/ __webpack_require__.r = (exports) => {
/******/ if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/ Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/ }
/******/ Object.defineProperty(exports, '__esModule', { value: true });
/******/ };
/******/ })();
/******/
/************************************************************************/
var __webpack_exports__ = {};
// This entry need to be wrapped in an IIFE because it need to be isolated against other modules in the chunk.
(() => {
/*!********************************!*\
!*** ./src/websql_adapter.mjs ***!
\********************************/
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */ "WebSQLAdapter": () => (/* binding */ WebSQLAdapter)
/* harmony export */ });
/* harmony import */ var _websql_adapter_error_mjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./websql_adapter_error.mjs */ "./src/websql_adapter_error.mjs");
/* harmony import */ var _database_wrapper_mjs__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(/*! ./database_wrapper.mjs */ "./src/database_wrapper.mjs");
/* harmony import */ var _response_wrapper_mjs__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(/*! ./response_wrapper.mjs */ "./src/response_wrapper.mjs");
/* harmony import */ var _log_mjs__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(/*! ./log.mjs */ "./src/log.mjs");
const databases = new Map();
const WebSQLAdapter = {
open: async (dbName) => {
const version = "1.0";
if (!databases.has(dbName)) {
databases.set(dbName, new _database_wrapper_mjs__WEBPACK_IMPORTED_MODULE_1__.DatabaseWrapper(dbName, version));
}
return _response_wrapper_mjs__WEBPACK_IMPORTED_MODULE_2__.ResponseWrapper.success({ version });
},
close: async (dbName) => {
databases.delete(dbName);
return _response_wrapper_mjs__WEBPACK_IMPORTED_MODULE_2__.ResponseWrapper.success();
},
sql: async (dbName, sql, ...args) => {
(0,_log_mjs__WEBPACK_IMPORTED_MODULE_3__.log)(sql);
const db = databases.get(dbName);
if (!db) {
throw new _websql_adapter_error_mjs__WEBPACK_IMPORTED_MODULE_0__.WebSQLAdapterError("Database not open");
}
const result = await db.sql(sql, ...args);
return _response_wrapper_mjs__WEBPACK_IMPORTED_MODULE_2__.ResponseWrapper.success(result);
},
delete: async (dbName) => {
throw new _websql_adapter_error_mjs__WEBPACK_IMPORTED_MODULE_0__.WebSQLAdapterError("Delete not implemented");
},
debug: _log_mjs__WEBPACK_IMPORTED_MODULE_3__.enableDebug
};
})();
module.exports["pawsqlite-websql-adapter"] = __webpack_exports__.default;
/******/ })()
;
//# sourceMappingURL=pawsqlite-websql-adapter.js.map

1
lib/pawsqlite-websql-adapter.js.map
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1030
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20
package.json
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{
"name": "pawsqlite-websql-adapter",
"version": "1.0.0",
"description": "A WebSQL Adapter for PawSQLite",
"main": "./lib/pawsqlite-websql-adapter.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"build": "webpack"
},
"repository": {
"type": "git",
"url": "https://git.n0m.org/n0m/PawSQLite-WebSQL-Adapter.git"
},
"author": "Ben Ashton",
"license": "MIT",
"devDependencies": {
"webpack": "5.x",
"webpack-cli": "4.x"
}
}

30
src/database_wrapper.mjs
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import { TransactionManager } from "./transaction_manager.mjs";
export class DatabaseWrapper {
constructor(dbName, version) {
this.name = dbName;
this.db = openDatabase(this.name, version, "", 5 * 1024 * 1024);
this.transManager = new TransactionManager(this.db);
}
sql(sql, ...args) {
const reg = /^\s*(BEGIN|END|COMMIT|ROLLBACK)(?:[^A-Z]|$)/i;
const match = reg.exec(sql);
if (match) {
const statement = match[1].toUpperCase();
switch(statement) {
case "BEGIN":
return this.transManager.begin();
case "END":
case "COMMIT":
return this.transManager.commit();
case "ROLLBACK":
return this.transManager.rollback();
}
} else {
return this.transManager.sql(sql, args);
}
}
}

14
src/log.mjs
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let DEBUG = false;
export function log(...args) {
if (DEBUG) {
console.log(...args);
}
}
export function enableDebug(active) {
DEBUG = !!active;
log("PawSQLite-WebSQL-Adapter: debugging " + (
DEBUG ? "enabled" : "disabled")
);
}

8
src/response_wrapper.mjs
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export const ResponseWrapper = {
success: (obj = {}) => ({
success: true,
...obj
})
};

22
src/result_mapper.mjs
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export function mapResult(originalResult) {
const newResult = {};
if (!originalResult) {
return newResult;
}
try {
newResult.insertId = originalResult.insertId;
} catch (e) {}
newResult.rowsAffected = originalResult.rowsAffected;
if ("rows" in originalResult) {
newResult.rows = [];
for (let i = 0; i < originalResult.rows.length; i++) {
newResult.rows.push(originalResult.rows.item(i));
}
}
return newResult;
}

156
src/transaction_manager.mjs
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import { WebSQLAdapterError } from "./websql_adapter_error.mjs";
import { mapResult } from "./result_mapper.mjs";
import { log } from "./log.mjs";
class Task {
constructor(job, startsTransaction=false, endsTransaction=false) {
this._job = job;
if (startsTransaction && endsTransaction) {
throw new Error("Task cannot start and end a transaction.");
}
this.startsTransaction = startsTransaction;
this.endsTransaction = endsTransaction;
this.result = new Promise ((resolve, reject) => {
this._resolve = resolve;
this._reject = reject;
});
}
run(tx) {
return this._job(tx).then((result) => {
this._resolve(result);
return result;
}, (e) => {
this._reject(e);
});
}
}
export class TransactionManager {
constructor(db) {
this.db = db;
this._txCount = 0;
this._tasks = [];
this._processing = false;
}
begin() {
return this._addTask(new Task((tx) => {
return new Promise((resolve, reject) => {
if (tx) {
reject(new WebSQLAdapterError("BEGIN called with an active " +
"transaction. This should not happen"));
return;
}
this.db.transaction((tx) => {
resolve(tx);
});
});
}, true)).then(() => mapResult());
}
sql(sql, args = []) {
return this._addTask(new Task((tx) => {
return this._executeSql(tx, sql, args);
}));
}
commit() {
return this._addTask(new Task((tx) => {
return Promise.resolve(mapResult());
}, false, true));
}
rollback() {
// Hack to manually cause rollback:
// Intentionally cause an error with rollbackOnError set to true
return this._addTask(new Task((tx) => {
return this._executeSql(tx, "", [], true).catch(() => mapResult());
}, false, true));
}
async _process() {
if (this._processing) {
return;
}
this._processing = true;
let tx = null;
let keepaliveCount = 0;
while (true) {
const tasks = this._tasks;
this._tasks = [];
if (tasks.length) {
const promises = [];
for (const task of tasks) {
const promise = task.run(tx);
if (task.startsTransaction) {
tx = await promise;
this._txCount++;
} else {
if (task.endsTransaction) {
tx = null;
keepaliveCount = 0;
}
promises.push(promise);
}
}
await Promise.all(promises);
} else {
if (tx) {
await this._nop(tx);
keepaliveCount++;
if (keepaliveCount % 5000 === 0) {
log(`Transaction: ${ this._txCount } Keepalive: #${ keepaliveCount }`);
}
} else {
break;
}
}
}
this._processing = false;
}
_addTask(task) {
this._tasks.push(task);
this._process();
return task.result;
}
_executeSql(tx, sql, sqlArgs = [], rollbackOnError = false) {
return new Promise((resolve, reject) => {
if (!tx) {
reject(new WebSQLAdapterError("No transaction. This should not be " +
" possible"));
return;
}
tx.executeSql(sql, sqlArgs, (tx, result) => {
resolve(mapResult(result));
}, (tx, e) => {
reject(WebSQLAdapterError.from(e));
return rollbackOnError;
});
});
}
_nop(tx) {
return this._executeSql(tx, "SELECT 1");
}
}

41
src/websql_adapter.mjs
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import { WebSQLAdapterError } from "./websql_adapter_error.mjs";
import { DatabaseWrapper } from "./database_wrapper.mjs";
import { ResponseWrapper } from "./response_wrapper.mjs";
import { enableDebug, log } from "./log.mjs";
const databases = new Map();
export const WebSQLAdapter = {
open: async (dbName) => {
const version = "1.0";
if (!databases.has(dbName)) {
databases.set(dbName, new DatabaseWrapper(dbName, version));
}
return ResponseWrapper.success({ version });
},
close: async (dbName) => {
databases.delete(dbName);
return ResponseWrapper.success();
},
sql: async (dbName, sql, ...args) => {
log(sql);
const db = databases.get(dbName);
if (!db) {
throw new WebSQLAdapterError("Database not open");
}
const result = await db.sql(sql, ...args);
return ResponseWrapper.success(result);
},
delete: async (dbName) => {
throw new WebSQLAdapterError("Delete not implemented");
},
debug: enableDebug
};

9
src/websql_adapter_error.mjs
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export class WebSQLAdapterError extends Error {
static from(e) {
let message = "";
if (e && e.message) {
message = e.message;
}
return new WebSQLAdapterError(message);
}
}

18
webpack.config.js
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var webpack = require('webpack');
var libraryName = 'pawsqlite-websql-adapter';
var outputFile = libraryName + '.js';
var config = {
mode: 'development',
entry: __dirname + '/src/websql_adapter.mjs',
devtool: 'source-map',
output: {
path: __dirname + '/lib',
filename: outputFile,
library: libraryName,
libraryExport: 'default',
libraryTarget: 'commonjs2',
}
};
module.exports = config;
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