node-beanstalk
Version:
The most comprehensive beanstalk client for nodejs
221 lines • 10 kB
JavaScript
"use strict";
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
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) {
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return g = { next: verb(0), "throw": verb(1), "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) {
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case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
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if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Pool = void 0;
var const_1 = require("./const");
var PoolClient_1 = require("./PoolClient");
var LinkedList_1 = require("./util/LinkedList");
var PoolError_1 = require("./error/PoolError");
var Pool = /** @class */ (function () {
function Pool(options) {
if (options === void 0) { options = {}; }
var _this = this;
this._clients = [];
this._idleClients = new LinkedList_1.LinkedList();
this._pendingQueue = new LinkedList_1.LinkedList();
this._state = 'live';
this.handleClientRelease = function (client) {
if (_this._state !== 'live')
return;
var pending = _this._pendingQueue.unshift();
if (pending) {
pending.resolve(client);
}
else {
_this._idleClients.push(client);
}
};
this._opt = __assign(__assign({}, const_1.DEFAULT_POOL_OPTIONS), options);
}
Object.defineProperty(Pool.prototype, "capacity", {
/**
* Total capacity of the pool.
*/
get: function () {
return this._opt.capacity;
},
enumerable: false,
configurable: true
});
Object.defineProperty(Pool.prototype, "idleCount", {
/**
* Amount of clients which are not reserved and currently idle in the pool.
*/
get: function () {
return this._idleClients.size;
},
enumerable: false,
configurable: true
});
Object.defineProperty(Pool.prototype, "waitingCount", {
/**
* Total amount of queued client requests when all clients are reserved. It is helpful to monitor
* this number to see if you need to adjust the size of the pool.
*/
get: function () {
return this._pendingQueue.size;
},
enumerable: false,
configurable: true
});
/**
* Current pool state.
*/
Pool.prototype.getState = function () {
return this._state;
};
/**
* Reserve a client from the pool.
*
* If the pool is full and all clients are currently reserved, this will wait in a FIFO queue
* until a client becomes available by it being released back to the pool.
*
* If there are idle clients in the pool it will be returned.
*
* If the pool is not full a new client will be created and connected.
*/
Pool.prototype.connect = function () {
var _a;
return __awaiter(this, void 0, void 0, function () {
var client, _b;
return __generator(this, function (_c) {
switch (_c.label) {
case 0:
if (this._state !== 'live') {
throw new PoolError_1.PoolError("Unable to gain client, pool is not live: ".concat(this._state));
}
if (!(this._clients.length < this._opt.capacity)) return [3 /*break*/, 2];
client = new PoolClient_1.PoolClient(this._opt.clientOptions);
this._clients.push(client);
return [4 /*yield*/, client.connect()];
case 1:
_c.sent();
return [3 /*break*/, 6];
case 2:
if (!((_a = this._idleClients.unshift()) !== null && _a !== void 0)) return [3 /*break*/, 3];
_b = _a;
return [3 /*break*/, 5];
case 3: return [4 /*yield*/, this.createPendingPromise()];
case 4:
_b = (_c.sent());
_c.label = 5;
case 5:
client = _b;
_c.label = 6;
case 6:
client.once('release', this.handleClientRelease);
return [2 /*return*/, client];
}
});
});
};
/**
* Disconnect all clients from server after all pending requests performed.
* All currently reserved clients will not be returned to the pool and ended in-place after all
* pending requests performed.
*
* If {force} set to truthy value - clients pending requests will not be awaited.
*/
Pool.prototype.disconnect = function (force) {
if (force === void 0) { force = false; }
return __awaiter(this, void 0, void 0, function () {
var _i, _a, reject;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (this._state !== 'live') {
throw new PoolError_1.PoolError("Unable to disconnect pool that is not live, current state: ".concat(this._state));
}
if (!this._pendingQueue.size) return [3 /*break*/, 2];
if (!!force) return [3 /*break*/, 2];
// in case non-forced disconnect - we wait in queue
return [4 /*yield*/, this.createPendingPromise()];
case 1:
// in case non-forced disconnect - we wait in queue
_b.sent();
_b.label = 2;
case 2:
this._state = 'disconnecting';
// reject all pending queue
// eslint-disable-next-line no-restricted-syntax
for (_i = 0, _a = this._pendingQueue.truncate(); _i < _a.length; _i++) {
reject = _a[_i].reject;
reject(new PoolError_1.PoolError('Unable to gain client, pool is disconnecting.'));
}
this._idleClients.truncate();
// disconnect all existing clients
return [4 /*yield*/, Promise.allSettled(this._clients.splice(0, this._clients.length).map(function (client) { return client.disconnect(force); }))];
case 3:
// disconnect all existing clients
_b.sent();
this._state = 'disconnected';
return [2 /*return*/];
}
});
});
};
/**
* Restore pool from disconnected state.
*/
Pool.prototype.restore = function () {
if (this._state !== 'disconnected') {
throw new PoolError_1.PoolError("Unable to restore pool that was not disconnected, current state: ".concat(this._state));
}
this._state = 'live';
};
Pool.prototype.createPendingPromise = function () {
var _this = this;
return new Promise(function (resolve, reject) {
_this._pendingQueue.push({ resolve: resolve, reject: reject });
});
};
return Pool;
}());
exports.Pool = Pool;
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