sqljs-documentstore
Version:
Minimal, encrypted, sql friendly typed document store, with support for indexed columns. Protects against transactional conflicts
150 lines • 8.32 kB
JavaScript
"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g = Object.create((typeof Iterator === "function" ? Iterator : Object).prototype);
return g.next = verb(0), g["throw"] = verb(1), g["return"] = verb(2), typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.LockedDatabase = void 0;
var AsyncLock = require("async-lock");
var LockedDatabase = /** @class */ (function () {
function LockedDatabase(db, flush) {
this.db = db;
this.flush = flush;
this.lock = new AsyncLock();
this.config = {};
this.state = { queued: [] };
}
LockedDatabase.prototype.run = function (txnId, sql, params) {
if (params === void 0) { params = []; }
if (txnId !== this.txnId)
throw new Error("run: transaction doesn't match, txn in progress: ".concat(this.txnId, ", attempted txn: ").concat(this.txnId));
this.db.run(sql, params);
};
LockedDatabase.prototype.exec = function (sql, params) {
if (params === void 0) { params = []; }
return this.db.exec(sql, params);
};
/**
* all write operations must be wrapped in a transaction
* txns are locked using async-lock library to avoid bleeding across session/txn
*/
LockedDatabase.prototype.txnAsync = function (description, actions) {
return __awaiter(this, void 0, void 0, function () {
var txnId, queuedItem, ms;
var _this = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
txnId = "".concat(description, " ").concat(Math.floor(Math.random() * 4294967296).toString(16));
queuedItem = { txnId: txnId, description: description, timing: { waitMs: 0, actionMs: 0, flushMs: 0 } };
this.state.queued.push(queuedItem);
ms = performance.now();
return [4 /*yield*/, this.lock.acquire('txn_lock', function () { return __awaiter(_this, void 0, void 0, function () {
var error_1;
var _a, _b;
return __generator(this, function (_c) {
switch (_c.label) {
case 0:
_c.trys.push([0, 2, 3, 4]);
queuedItem.timing.waitMs = performance.now() - ms;
ms = performance.now();
this.txnId = txnId;
this.run(txnId, 'BEGIN TRANSACTION;');
return [4 /*yield*/, actions(txnId)];
case 1:
_c.sent();
queuedItem.timing.actionMs = performance.now() - ms;
ms = performance.now();
this.run(txnId, 'COMMIT TRANSACTION;');
this.flush();
queuedItem.timing.flushMs = performance.now() - ms;
return [3 /*break*/, 4];
case 2:
error_1 = _c.sent();
this.run(txnId, 'ROLLBACK TRANSACTION;');
throw error_1;
case 3:
this.txnId = undefined;
this.state.queued.pop();
(_b = (_a = this.config).loggingHook) === null || _b === void 0 ? void 0 : _b.call(_a, queuedItem);
return [7 /*endfinally*/];
case 4: return [2 /*return*/];
}
});
}); })];
case 1:
_a.sent();
return [2 /*return*/];
}
});
});
};
LockedDatabase.prototype.txn = function (description, actions) {
var _a, _b;
var txnId = "".concat(description, " ").concat(Math.floor(Math.random() * 4294967296).toString(16)); //generate a unique but identifiable txnId
var queuedItem = { txnId: txnId, description: description, timing: { waitMs: 0, actionMs: 0, flushMs: 0 } };
this.state.queued.push(queuedItem);
var ms = performance.now();
if (this.lock.isBusy('txn_lock'))
throw new Error("_txnSync: transaction already in progress, txn in progress: ".concat(this.txnId, ", attempted txn: ").concat(txnId));
try {
queuedItem.timing.waitMs = performance.now() - ms;
ms = performance.now();
this.txnId = txnId;
this.run(txnId, 'BEGIN TRANSACTION;');
actions(txnId);
queuedItem.timing.actionMs = performance.now() - ms;
ms = performance.now();
this.run(txnId, 'COMMIT TRANSACTION;');
this.flush();
queuedItem.timing.flushMs = performance.now() - ms;
}
catch (error) {
this.run(txnId, 'ROLLBACK TRANSACTION;');
throw error;
}
finally {
this.txnId = undefined;
this.state.queued.pop();
(_b = (_a = this.config).loggingHook) === null || _b === void 0 ? void 0 : _b.call(_a, queuedItem);
}
};
return LockedDatabase;
}());
exports.LockedDatabase = LockedDatabase;
;
;
;
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