server-status-check
Version:
query the server periodically to check whether it is up
217 lines (216 loc) • 11.4 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) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
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) {
if (f) throw new TypeError("Generator is already executing.");
while (_) 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 };
}
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var Dev_ServerBugError_1 = __importDefault(require("../errors/Dev_ServerBugError"));
var sleep_1 = __importDefault(require("swiss-army-knifey/build/src/utils/sleep"));
var getStringDate_1 = require("swiss-army-knifey/build/src/utils/getStringDate");
function isWrappedStatusWithInitializedErrors(w) {
return w.errors !== undefined && Array.isArray(w.errors);
}
var StatusCheckService = /** @class */ (function () {
function StatusCheckService(_a) {
var notifyAll = _a.notifyAll, serverUri = _a.serverUri, checkStatus = _a.checkStatus, checkInterval = _a.checkInterval, onFailNotifyHoursInterval = _a.onFailNotifyHoursInterval, notificationMessages = _a.notificationMessages;
if (!notifyAll) {
throw new Dev_ServerBugError_1.default('StatusCheck service needs notifyAll to operate');
}
this.checkInterval = checkInterval;
this.userProvidedCheckStatus = checkStatus;
this.lastChecked = null;
this.lastEmailSentTime = null;
this.notifyAll = notifyAll;
this.onFailNotifyHoursInterval = onFailNotifyHoursInterval;
this.serverUri = serverUri;
this.wrappedStatus = { status: null, errors: [] };
this.statusChecksCount = 0;
if (notificationMessages.all !== undefined) {
this.notificationMessages = {
email: notificationMessages.all,
sms: notificationMessages.all,
};
}
else {
this.notificationMessages = notificationMessages;
}
}
StatusCheckService.prototype.run = function () {
return __awaiter(this, void 0, void 0, function () {
var _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (!1) return [3 /*break*/, 3];
_a = this.handleNewStatus;
return [4 /*yield*/, this.checkStatus()];
case 1:
_a.apply(this, [_b.sent()]);
return [4 /*yield*/, (0, sleep_1.default)(this.checkInterval * 1000)];
case 2:
_b.sent();
return [3 /*break*/, 0];
case 3: return [2 /*return*/];
}
});
});
};
StatusCheckService.prototype.statusChanged = function (status) {
return this.wrappedStatus.status !== status;
};
StatusCheckService.prototype.changedStatusOrDownStatusForMoreThanOneHour = function (status) {
var notifyOnlyOnStatusChanges = this.onFailNotifyHoursInterval === 0;
var notifiedTooLongAgo = this.lastEmailSentTime !== null && this.lastEmailSentTime <= (0, getStringDate_1.hoursAgo)(this.onFailNotifyHoursInterval);
return this.statusChanged(status) || (!notifyOnlyOnStatusChanges && (!status && notifiedTooLongAgo));
};
StatusCheckService.prototype.shouldNotifyCurrentStatus = function (status) {
return this.changedStatusOrDownStatusForMoreThanOneHour(status);
};
StatusCheckService.prototype.getStatusFriendlyPhrase = function (status) {
return (status === null
? 'Please wait: system status'
: status
? 'Good news: system'
: 'Alert: system') + " is " + this.getStatusName(status) + "!";
};
StatusCheckService.prototype.notifyServiceStatus = function (_a) {
var status = _a.status;
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (!(this.lastChecked !== null && status !== null)) return [3 /*break*/, 2];
return [4 /*yield*/, this.notifyAll({
email: __assign({}, this.notificationMessages.email[status ? "up" : "down"]),
sms: __assign({}, this.notificationMessages.sms[status ? "up" : "down"]),
})];
case 1:
_b.sent();
_b.label = 2;
case 2: return [2 /*return*/];
}
});
});
};
StatusCheckService.prototype.handleNewStatus = function (w) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
if (this.shouldNotifyCurrentStatus(w.status)) {
this.notifyServiceStatus(w);
this.lastEmailSentTime = Date.now();
}
this.wrappedStatus = isWrappedStatusWithInitializedErrors(w)
? w
: __assign(__assign({}, w), { errors: [] });
return [2 /*return*/];
});
});
};
StatusCheckService.prototype.checkStatus = function () {
return __awaiter(this, void 0, void 0, function () {
var wrappedStatus, err_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
wrappedStatus = { status: false };
_a.label = 1;
case 1:
_a.trys.push([1, 3, , 4]);
return [4 /*yield*/, this.userProvidedCheckStatus()];
case 2:
wrappedStatus = _a.sent();
return [3 /*break*/, 4];
case 3:
err_1 = _a.sent();
this.handleFailedRequest(err_1);
return [3 /*break*/, 4];
case 4:
this.statusChecksCount++;
this.lastChecked = Date.now();
return [2 /*return*/, wrappedStatus];
}
});
});
};
StatusCheckService.prototype.handleFailedRequest = function (err) {
throw err;
};
StatusCheckService.prototype.getCheckIntervalInMinutes = function () {
return Math.ceil(this.checkInterval / 60);
};
StatusCheckService.prototype.getStatusStats = function () {
var dateLastChecked = this.lastChecked === null ? 'Never' : new Date(this.lastChecked).toLocaleDateString() + ", " + new Date(this.lastChecked).toLocaleTimeString();
var checkIntervalInMinutes = this.getCheckIntervalInMinutes();
var checksSpreeCount = this.statusChecksCount;
var friendlyStatusPhrase = this.wrappedStatus.status === null ? 'Unknown' : this.getStatusFriendlyPhrase(this.wrappedStatus.status);
var friendlyFullSentence = (this.lastChecked === null || this.wrappedStatus.status === null)
? "Not checked yet. Please wait " + checkIntervalInMinutes + " min. or so and refresh this page."
: friendlyStatusPhrase + ". Last time I checked was on " + dateLastChecked.split(', ').join(' at ') + " (checked " + checksSpreeCount + " time" + (checksSpreeCount === 1 ? '' : 's') + " in a row without restarting). I check every " + checkIntervalInMinutes + " min.";
var secondsBetweenLastCheckAndNow = Math.floor((Date.now() - (this.lastChecked || Date.now())) / 1000);
var aliveSeconds = this.checkInterval * (this.statusChecksCount - 1) + (secondsBetweenLastCheckAndNow < this.checkInterval ? secondsBetweenLastCheckAndNow : 0);
var aliveForYMDHMS = (0, getStringDate_1.secondsToYMWDHMSSentence)(aliveSeconds);
return {
errors: this.wrappedStatus.errors,
friendlyFullSentence: friendlyFullSentence,
friendlyStatusPhrase: friendlyStatusPhrase,
checkIntervalInMinutes: checkIntervalInMinutes,
dateLastChecked: dateLastChecked,
checksSpreeCount: checksSpreeCount,
statusName: this.getStatusName(this.wrappedStatus.status),
aliveForYMDHMS: aliveForYMDHMS,
};
};
StatusCheckService.prototype.getStatusName = function (status) {
if (status === null)
return 'unknown';
return status ? 'up' : 'down';
};
return StatusCheckService;
}());
exports.default = StatusCheckService;