@fluidware-it/healthz-server
Version:
Simple http server to expose an healthz endpoint
152 lines • 7.32 kB
JavaScript
/*
* Copyright Fluidware srl
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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 };
}
};
import { createServer } from 'http';
var healthServerSymbol = Symbol.for('Fw.HealthzServer');
var _global = global;
var defaultOptions = {
path: '/healthz',
address: '0.0.0.0',
port: 8282
};
var HealthzServer = /** @class */ (function () {
function HealthzServer() {
}
HealthzServer.start = function (opts, healthCheck) {
return __awaiter(this, void 0, void 0, function () {
var _a, PATH, ADDRESS, PORT;
return __generator(this, function (_b) {
if (typeof opts === 'function') {
healthCheck = opts;
opts = {};
}
if (healthCheck) {
if (typeof healthCheck !== 'function') {
throw new Error('healthCheck must be a function');
}
}
_a = Object.assign({}, defaultOptions, opts), PATH = _a.path, ADDRESS = _a.address, PORT = _a.port;
if (_global[healthServerSymbol]) {
return [2 /*return*/, Promise.resolve(null)];
}
_global[healthServerSymbol] = createServer(function (req, res) {
if (req.url === PATH) {
if (!healthCheck) {
res.end('OK');
return;
}
try {
var check = healthCheck();
if (check instanceof Promise) {
check
.then(function () {
res.end('OK');
})
.catch(function (e) {
res.writeHead(500, { 'x-error': e.message });
res.end('KO');
});
}
else {
res.end('OK');
}
}
catch (e) {
res.writeHead(500, { 'x-error': e.message });
res.end('KO');
}
}
else {
res.writeHead(404);
res.end('Not Found');
}
});
process.once('SIGTERM', HealthzServer.stop);
process.once('SIGINT', HealthzServer.stop);
return [2 /*return*/, new Promise(function (resolve, reject) {
_global[healthServerSymbol].on('error', function (e) {
reject(e);
});
var opts = {
address: ADDRESS,
port: PORT
};
_global[healthServerSymbol].listen(opts, function () {
var addr = _global[healthServerSymbol].address();
resolve(addr);
});
})];
});
});
};
HealthzServer.stop = function () {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
process.off('SIGTERM', HealthzServer.stop);
process.off('SIGINT', HealthzServer.stop);
return [2 /*return*/, new Promise(function (resolve) {
if (_global[healthServerSymbol]) {
_global[healthServerSymbol].close(function () {
delete _global[healthServerSymbol];
resolve(true);
});
}
else {
resolve(true);
}
})];
});
});
};
return HealthzServer;
}());
export { HealthzServer };
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