PawSQLite/lib/pawsqlite.js

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/***/ "./src/database.mjs":
/*!**************************!*\
  !*** ./src/database.mjs ***!
  \**************************/
/*! exports provided: Database */
/***/ (function(__webpack_module__, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Database", function() { return Database; });
/* harmony import */ var _transaction_manager_mjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./transaction_manager.mjs */ "./src/transaction_manager.mjs");



class Database {
  constructor(dbName, adapter) {
    this.dbName = dbName;
    this.adapter = adapter;
    this.version = null;
    this.path = null;

    this.transactionManager = new _transaction_manager_mjs__WEBPACK_IMPORTED_MODULE_0__["TransactionManager"](dbName, this.adapter);
  }

  async open() {
    let response = await this.adapter.open(this.dbName);

    if (response) {
      if (response.hasOwnProperty('version')) {
        this.version = response.version;
      }
      if (response.hasOwnProperty('path')) {
        this.path = response.path;
      }
    }

    // Allow chaining
    return this;
  }

  close() {
    return this.adapter.close(this.dbName);
  }

  transaction() {
    return this.transactionManager.transaction();
  }


  async autoTransaction(cb, inheritTx) {
    let tx = inheritTx || this.transaction();
    let result;

    try {
      result = await cb(tx);
    } catch (e) {
      if (!inheritTx) {
        await tx.rollback();
      }
      throw e;
    }

    if (!inheritTx) {
      await tx.commit();
    }

    return result;
  }


  // Helper method to start a transaction and execute a single SQL statement
  sql(sql, ...args) {
    return this.autoTransaction((tx) => tx.sql(sql, ...args));
  }
}

/***/ }),

/***/ "./src/log.mjs":
/*!*********************!*\
  !*** ./src/log.mjs ***!
  \*********************/
/*! exports provided: log, enableDebug */
/***/ (function(__webpack_module__, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "log", function() { return log; });
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "enableDebug", function() { return enableDebug; });
let DEBUG = false;

function log(...args) {
  if (DEBUG) {
    console.log(...args);
  } 
}

function enableDebug(active) {
  DEBUG = !!active;
  log("PawSQLite: debugging " + (DEBUG ? "enabled" : "disabled"));

  if (DEBUG) {
    log("You might also want to enable debugging for the adapter that you " +
      "are using");
  }
}

/***/ }),

/***/ "./src/pawsqlite.mjs":
/*!***************************!*\
  !*** ./src/pawsqlite.mjs ***!
  \***************************/
/*! exports provided: default */
/***/ (function(__webpack_module__, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony import */ var _database_mjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./database.mjs */ "./src/database.mjs");
/* harmony import */ var _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(/*! ./pawsqlite_error.mjs */ "./src/pawsqlite_error.mjs");
/* harmony import */ var _log_mjs__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(/*! ./log.mjs */ "./src/log.mjs");





const adapters = [];


/* harmony default export */ __webpack_exports__["default"] = ({
  open: async function(dbName, options = {}) {
    const adapter = getAdapter(options.adapter);

    let db = new _database_mjs__WEBPACK_IMPORTED_MODULE_0__["Database"](dbName, adapter);
    await db.open();
    return db;
  },
  delete: function(dbName, options = {}) {
    const adapter = getAdapter(options.adapter);

    return adapter.delete(dbName);
  },
  registerAdapter: function(adapter) {
    adapters.push(wrapAdapter(adapter));
  },
  debug: _log_mjs__WEBPACK_IMPORTED_MODULE_2__["enableDebug"],
  Error: _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"]
});


function wrapAdapter() {
  const wrapped = {};

  ["name", "open", "close", "delete", "sql"].forEach((prop) => {
    if (!(prop in adapter)) {
      throw new _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"](`Invalid adapter: missing property: ${ prop }`);
    }

    if (
      prop === "name" && !(
        typeof adapter[prop] === "string" ||
        adapter[prop] instanceof String
      ) ||
      prop !== "name" && (
        typeof adapter[prop] !== "function"
      )
    ) {
      throw new _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"]("Invalid adapter: invalid type for property: " +
        prop);
    }

    if (typeof adapter[prop] === "function") {
      wrapped[prop] = async (...args) => {
        try {
          return await adapter[prop](...args);
        } catch (err) {
          throw _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"].from(err);
        }
      };
    } else {
      wrapped[prop] = adapter[prop];
    }
  });

  return wrapped;
}


function getAdapter(adapterName) {
  const adapter = adapters.find((a) => a.name === adapterName);

  if (!adapter) {
    throw new _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"](`Unknown Adapter: ${adapterName}`);
  }

  return adapter;
}

/***/ }),

/***/ "./src/pawsqlite_error.mjs":
/*!*********************************!*\
  !*** ./src/pawsqlite_error.mjs ***!
  \*********************************/
/*! exports provided: PawSQLiteError */
/***/ (function(__webpack_module__, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "PawSQLiteError", function() { return PawSQLiteError; });
class PawSQLiteError extends Error {
  static from(err) {
    const p_err = new PawSQLiteError(err.toString());
    p_err.cause = err;
    return p_err;
  }

  constructor(message) {
    super(message);
    this.name = "PawSQLiteError";
  }
}

/***/ }),

/***/ "./src/result.mjs":
/*!************************!*\
  !*** ./src/result.mjs ***!
  \************************/
/*! exports provided: Result */
/***/ (function(__webpack_module__, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Result", function() { return Result; });
/* harmony import */ var _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./pawsqlite_error.mjs */ "./src/pawsqlite_error.mjs");



class Result extends Array {
  constructor(result) {
    if (result.hasOwnProperty("rows")) {
      super(...result.rows);
    } else {
      super();
    }

    if (result.hasOwnProperty("insertId")) {
      this.insertId = result.insertId;
    }
    if (result.hasOwnProperty("rowsAffected")) {
      this.rowsAffected = result.rowsAffected;
    }
  }
}

/***/ }),

/***/ "./src/transaction.mjs":
/*!*****************************!*\
  !*** ./src/transaction.mjs ***!
  \*****************************/
/*! exports provided: Transaction */
/***/ (function(__webpack_module__, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Transaction", function() { return Transaction; });
/* harmony import */ var _result_mjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./result.mjs */ "./src/result.mjs");
/* harmony import */ var _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(/*! ./pawsqlite_error.mjs */ "./src/pawsqlite_error.mjs");




class Transaction {
  constructor(dbName, adapter, enqueue, rollbackOnError=false) {
    this.dbName = dbName;
    this.adapter = adapter;
    this._rollbackOnError = rollbackOnError;

    this._enqueue = enqueue;
    this._completeCb = null;

    this._readyWait = null;
    this._ready = false;
    this._finalized = false;
  }

  async sql(sql, ...args) {
    if (this._finalized) {
      throw new _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"]("Transaction has already completed");
    }

    if (!this._ready) {
      await this._waitUntilReady();
    }

    try {
      return await this._executeSQL(sql, ...args);
    } catch (e) {
      if (this._rollbackOnError) {
        await this.rollback();
      }
      throw e;
    }
  }

  // Allow for slightly more complex parameter substitution.
  // Instances of "???" will be replaced by the same number of comma-separated
  // question marks as items in the corresponding nested parateter array
  // eg. buildQuery("SELECT (???) FROM ?", [["col1", "col2"], "table1"])
  // would output: ["SELECT (?, ?) FROM ?", ["col1", "col2", "table1"]]
  buildQuery(sql, ...args) {
    const parts = sql.split("???");
    const subParamLengths = args
      .filter(Array.isArray)
      .map((a) => a.length);
    if (parts.length !== subParamLengths.length + 1) {
      throw new _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"]("Unable to build query: sub-" +
        "paramters do not match sub-paramters in query");
    }

    const newQuery = parts.reduce((p1, p2, i) => {
      const length = subParamLengths[i - 1];
      return p1 + new Array(length).fill("?").join(", ") + p2;
    });

    const flatParams = args.reduce((acc, v) => {
      if (Array.isArray(v)) {
        Array.prototype.push.apply(acc, v);
      } else {
        acc.push(v);
      }
      return acc;
    }, []);

    return [newQuery, ...flatParams];
  }

  commit() {
    return this._complete("COMMIT");
  }

  rollback() {
    return this._complete("ROLLBACK");
  }

  async _waitUntilReady() {
    if (!this._readyWait) {
      this._readyWait = (async () => {
        this._completeCb = await this._enqueue();
        await this._begin();
        this._ready = true;
      })();
    }
    
    await this._readyWait;
  }

  async _executeSQL(sql, ...args) {
    const reg = /^\s*(BEGIN|END|COMMIT|ROLLBACK)(?:[^A-Z]|$)/i;
    const match = reg.exec(sql);
    if (match) {
      const statement = match[1].toUpperCase();
      throw new _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"]("Manually managing transactions is " +
        "forbidden. Found: \"" + statement + "\" statement.");
    }

    const result = await this.adapter.sql(this.dbName,
      ...this.buildQuery(sql, ...args));

    return new _result_mjs__WEBPACK_IMPORTED_MODULE_0__["Result"](result);
  }

  async _begin() {
    const result = await this.adapter.sql(this.dbName, "BEGIN");
  }

  async _complete(sql) {
    if (this._finalized) {
      throw new _pawsqlite_error_mjs__WEBPACK_IMPORTED_MODULE_1__["PawSQLiteError"]("Transaction has already completed");
    }
    this._finalized = true;

    if (!this._readyWait) {
      // Transaction was unused
      return;
    } else if (!this._ready) {
      await this._waitUntilReady();
    }

    let result;
    let error;
    try {
      result = await this.adapter.sql(this.dbName, sql);
    } catch (e) {
      error = e;
    }
    
    this._completeCb();
    
    if (error) {
      throw error;
    }

    return new _result_mjs__WEBPACK_IMPORTED_MODULE_0__["Result"](result);
  }
}

/***/ }),

/***/ "./src/transaction_manager.mjs":
/*!*************************************!*\
  !*** ./src/transaction_manager.mjs ***!
  \*************************************/
/*! exports provided: TransactionManager */
/***/ (function(__webpack_module__, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "TransactionManager", function() { return TransactionManager; });
/* harmony import */ var _transaction_mjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./transaction.mjs */ "./src/transaction.mjs");


class TransactionManager {
  constructor(dbName, adapter) {
    this.dbName = dbName;
    this.adapter = adapter;
    this._queue = [];
    this._inTransaction = false;
  }

  transaction() {
    return new _transaction_mjs__WEBPACK_IMPORTED_MODULE_0__["Transaction"](this.dbName, this.adapter,
      this.enqueue.bind(this));
  }

  enqueue() {
    let completeSignal;
    let transactionComplete = new Promise((r, _) => {
      completeSignal = r;
    });

    let readySignal;
    let dbReady = new Promise((r, _) => {
      readySignal = () => {
        r(completeSignal);
      };
    });

    this._queue.push({readySignal, transactionComplete});

    this._processQueue();
    return dbReady;
  }

  async _processQueue() {
    // We're already processing the queue
    if (this._inTransaction) {
      return;
    }

    while (true) {
      let item = this._queue.shift();
      if (!item) {
        return;
      }

      this._inTransaction = true;

      item.readySignal();
      await item.transactionComplete;

      this._inTransaction = false;
    }
  }
}

/***/ })

/******/ })["default"];
//# sourceMappingURL=pawsqlite.js.map