108 lines
3.0 KiB
JavaScript
108 lines
3.0 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule setupDevtools
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* @flow
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*/
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'use strict';
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function setupDevtools() {
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var messageListeners = [];
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var closeListeners = [];
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var ws = new window.WebSocket('ws://localhost:8081/devtools');
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// this is accessed by the eval'd backend code
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var FOR_BACKEND = { // eslint-disable-line no-unused-vars
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resolveRNStyle: require('flattenStyle'),
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wall: {
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listen(fn) {
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messageListeners.push(fn);
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},
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onClose(fn) {
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closeListeners.push(fn);
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},
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send(data) {
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ws.send(JSON.stringify(data));
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},
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},
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};
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ws.onclose = () => {
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console.warn('devtools socket closed');
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closeListeners.forEach(fn => fn());
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};
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ws.onerror = error => {
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console.warn('devtools socket errored', error);
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closeListeners.forEach(fn => fn());
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};
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ws.onopen = function () {
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tryToConnect();
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};
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function tryToConnect() {
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ws.send('attach:agent');
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var _interval = setInterval(() => ws.send('attach:agent'), 500);
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ws.onmessage = evt => {
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if (evt.data.indexOf('eval:') === 0) {
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clearInterval(_interval);
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initialize(evt.data.slice('eval:'.length));
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}
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};
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}
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function initialize(text) {
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try {
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// FOR_BACKEND is used by the eval'd code
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eval(text); // eslint-disable-line no-eval
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} catch (e) {
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console.error('Failed to eval' + e.message);
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return;
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}
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window.__REACT_DEVTOOLS_GLOBAL_HOOK__.inject({
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CurrentOwner: require('ReactCurrentOwner'),
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InstanceHandles: require('ReactInstanceHandles'),
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Mount: require('ReactNativeMount'),
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Reconciler: require('ReactReconciler'),
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TextComponent: require('ReactNativeTextComponent'),
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});
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ws.onmessage = handleMessage;
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}
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function handleMessage(evt) {
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// It's hard to handle JSON in a safe manner without inspecting it at
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// runtime, hence the any
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var data: any;
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try {
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data = JSON.parse(evt.data);
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} catch (e) {
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return console.error('failed to parse json: ' + evt.data);
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}
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// the devtools closed
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if (data.$close || data.$error) {
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closeListeners.forEach(fn => fn());
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window.__REACT_DEVTOOLS_GLOBAL_HOOK__.emit('shutdown');
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tryToConnect();
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return;
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}
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if (data.$open) {
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return; // ignore
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}
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messageListeners.forEach(fn => {
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try {
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fn(data);
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} catch (e) {
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// jsc doesn't play so well with tracebacks that go into eval'd code,
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// so the stack trace here will stop at the `eval()` call. Getting the
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// message that caused the error is the best we can do for now.
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console.log(data);
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throw e;
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}
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});
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}
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}
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module.exports = setupDevtools;
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