| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 |
| * |
| * http://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 config = { |
| 'port': 8080, |
| 'apiHost': process.env.__OW_API_HOST, |
| 'allowConcurrent': process.env.__OW_ALLOW_CONCURRENT |
| }; |
| |
| var bodyParser = require('body-parser'); |
| var express = require('express'); |
| |
| var app = express(); |
| |
| |
| /** |
| * instantiate an object which handles REST calls from the Invoker |
| */ |
| var service = require('./src/service').getService(config); |
| |
| app.set('port', config.port); |
| app.use(bodyParser.json({ limit: "48mb" })); |
| |
| app.post('/init', wrapEndpoint(service.initCode)); |
| app.post('/run', wrapEndpoint(service.runCode)); |
| |
| app.use(function(err, req, res, next) { |
| console.error(err.stack); |
| res.status(500).json({ error: "Bad request." }); |
| }); |
| |
| service.start(app); |
| |
| /** |
| * Wraps an endpoint written to return a Promise into an express endpoint, |
| * producing the appropriate HTTP response and closing it for all controlable |
| * failure modes. |
| * |
| * The expected signature for the promise value (both completed and failed) |
| * is { code: int, response: object }. |
| * |
| * @param ep a request=>promise function |
| * @returns an express endpoint handler |
| */ |
| function wrapEndpoint(ep) { |
| return function (req, res) { |
| try { |
| ep(req).then(function (result) { |
| res.status(result.code).json(result.response); |
| }).catch(function (error) { |
| if (typeof error.code === "number" && typeof error.response !== "undefined") { |
| res.status(error.code).json(error.response); |
| } else { |
| console.error("[wrapEndpoint]", "invalid errored promise", JSON.stringify(error)); |
| res.status(500).json({ error: "Internal error." }); |
| } |
| }); |
| } catch (e) { |
| // This should not happen, as the contract for the endpoints is to |
| // never (externally) throw, and wrap failures in the promise instead, |
| // but, as they say, better safe than sorry. |
| console.error("[wrapEndpoint]", "exception caught", e.message); |
| |
| res.status(500).json({ error: "Internal error (exception)." }); |
| } |
| } |
| } |