86 lines
2.2 KiB
JavaScript
86 lines
2.2 KiB
JavaScript
const {createServer} = require('http');
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const bodyParser = require('body-parser');
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const {invokeHookReduce} = require('@truss/comm');
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const {ActionEmitter} = require('./index');
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const debug = require('debug')('truss:emitters:http');
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const parser = bodyParser.json();
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module.exports = class HttpActionEmitter extends ActionEmitter {
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constructor(executors, listeners) {
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super(executors, listeners);
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this.server = createServer();
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}
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listen() {
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const port = process.env.GATEWAY_PORT || 8000;
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this.server.listen(port);
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this.server.on('listening', () => {
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debug(`listening on port ${port}...`);
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})
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this.server.on('request', (req, res) => { parser(req, res, () => {
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const method = req.method.toLowerCase();
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const url = req.url;
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debug(`${method} ${url}`);
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// map to action
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const headers = {
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...req.headers,
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...{
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connection: undefined,
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host: undefined,
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}
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};
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const action = {
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type: undefined,
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payload: {
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headers: headers,
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method: method,
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url: url,
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}
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};
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switch (method) {
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case 'post':
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// truss action
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if (url.startsWith('/truss/action/')) {
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action.type = url.substr('/truss/action/'.length);
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}
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// @truss/http-post
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else {
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action.type = '@truss/http-post';
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}
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action.payload = req.body;
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break;
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default:
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// @truss/http-(get|delete|...)
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action.type = `@truss/http-${method}`;
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break;
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}
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this.processAction(action, res);
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})});
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}
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onExecutorResponse(action, res, eres) {
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const {payload: {headers: actionHeaders}} = action;
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const {status, headers, response} = eres;
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const reduced$ = invokeHookReduce(
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'@truss/emitters/http', eres, actionHeaders
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);
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reduced$.then(({status, headers, response}) => {
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res.writeHead(status || 200, headers);
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res.end(response);
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});
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}
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onNoExecutor(action, res) {
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res.writeHead(501);
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res.end(
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'<!DOCTYPE html><html><body><h1>501 Not Implemented</h1></body></html>'
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);
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}
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unlisten() {
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this.server.close();
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}
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}
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