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Make reloads faster for simple file changes 

Summary:
This is a very hacky solution to make reloads from packager faster for simple file changes.

Simple means that no dependencies have changed, otherwise packager will abort the attempt to update and fall back to the usual rebuilding method.

In principle, this change avoids re-walking and analyzing the whole dependency tree, and just updates modules in existing bundles.

Reviewed By: bestander

Differential Revision: D3703896

fbshipit-source-id: 671206618dc093965822aed7161e3a99db69a529
This commit is contained in:
David Aurelio 2016-08-12 09:41:54 -07:00 committed by Facebook Github Bot 7
parent 62e8a8fe56
commit 626e510098
6 changed files with 192 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
react-packager/src/Bundler/Bundle.js vendored
View File

@ -59,7 +59,7 @@ class Bundle extends BundleBase {
this._addRequireCall(super.getMainModuleId());
}
super.finalize();
super.finalize(options);
}
_addRequireCall(moduleId) {

6
react-packager/src/Bundler/BundleBase.js vendored
View File

@ -59,8 +59,10 @@ class BundleBase {
}
finalize(options) {
if (!options.allowUpdates) {
Object.freeze(this._modules);
Object.freeze(this._assets);
}
this._finalized = true;
}
@ -76,6 +78,10 @@ class BundleBase {
return this._source;
}
invalidateSource() {
this._source = null;
}
assertFinalized(message) {
if (!this._finalized) {
throw new Error(message || 'Bundle needs to be finalized before getting any source');

11
react-packager/src/Bundler/__tests__/Bundler-test.js vendored
View File

@ -129,6 +129,7 @@ describe('Bundler', function() {
dependencies: modules,
transformOptions,
getModuleId: () => 123,
getResolvedDependencyPairs: () => [],
})
);
@ -141,7 +142,7 @@ describe('Bundler', function() {
});
});
pit('create a bundle', function() {
it('create a bundle', function() {
assetServer.getAssetData.mockImpl(() => {
return {
scales: [1,2,3],
@ -170,9 +171,11 @@ describe('Bundler', function() {
expect(ithAddedModule(3)).toEqual('/root/img/new_image.png');
expect(ithAddedModule(4)).toEqual('/root/file.json');
expect(bundle.finalize.mock.calls[0]).toEqual([
{runMainModule: true, runBeforeMainModule: []}
]);
expect(bundle.finalize.mock.calls[0]).toEqual([{
runMainModule: true,
runBeforeMainModule: [],
allowUpdates: false,
}]);
expect(bundle.addAsset.mock.calls[0]).toEqual([{
__packager_asset: true,

17
react-packager/src/Bundler/index.js vendored
View File

@ -89,6 +89,10 @@ const validateOpts = declareOpts({
type: 'boolean',
default: false,
},
allowBundleUpdates: {
type: 'boolean',
default: false,
},
});
const assetPropertyBlacklist = new Set([
@ -280,6 +284,7 @@ class Bundler {
bundle.finalize({
runMainModule,
runBeforeMainModule: runBeforeMainModuleIds,
allowUpdates: this._opts.allowBundleUpdates,
});
return bundle;
});
@ -402,6 +407,7 @@ class Bundler {
entryFilePath,
transformOptions: response.transformOptions,
getModuleId: response.getModuleId,
dependencyPairs: response.getResolvedDependencyPairs(module),
}).then(transformed => {
modulesByName[transformed.name] = module;
onModuleTransformed({
@ -533,7 +539,14 @@ class Bundler {
);
}
_toModuleTransport({module, bundle, entryFilePath, transformOptions, getModuleId}) {
_toModuleTransport({
module,
bundle,
entryFilePath,
transformOptions,
getModuleId,
dependencyPairs,
}) {
let moduleTransport;
const moduleId = getModuleId(module);
@ -566,7 +579,7 @@ class Bundler {
id: moduleId,
code,
map,
meta: {dependencies, dependencyOffsets, preloaded},
meta: {dependencies, dependencyOffsets, preloaded, dependencyPairs},
sourceCode: source,
sourcePath: module.path
});

169
react-packager/src/Server/index.js vendored
View File

@ -22,11 +22,18 @@ const mime = require('mime-types');
const path = require('path');
const url = require('url');
function debounce(fn, delay) {
var timeout;
return () => {
const debug = require('debug')('ReactNativePackager:Server');
function debounceAndBatch(fn, delay) {
let timeout, args = [];
return (value) => {
args.push(value);
clearTimeout(timeout);
timeout = setTimeout(fn, delay);
timeout = setTimeout(() => {
const a = args;
args = [];
fn(a);
}, delay);
};
}
@ -139,7 +146,10 @@ const bundleOpts = declareOpts({
isolateModuleIDs: {
type: 'boolean',
default: false
}
},
resolutionResponse: {
type: 'object',
},
});
const dependencyOpts = declareOpts({
@ -163,8 +173,14 @@ const dependencyOpts = declareOpts({
type: 'boolean',
default: false,
},
minify: {
type: 'boolean',
default: undefined,
},
});
const bundleDeps = new WeakMap();
class Server {
constructor(options) {
const opts = validateOpts(options);
@ -209,12 +225,27 @@ class Server {
const bundlerOpts = Object.create(opts);
bundlerOpts.fileWatcher = this._fileWatcher;
bundlerOpts.assetServer = this._assetServer;
bundlerOpts.allowBundleUpdates = !options.nonPersistent;
this._bundler = new Bundler(bundlerOpts);
this._fileWatcher.on('all', this._onFileChange.bind(this));
this._debouncedFileChangeHandler = debounce(filePath => {
this._debouncedFileChangeHandler = debounceAndBatch(filePaths => {
// only clear bundles for non-JS changes
if (filePaths.every(RegExp.prototype.test, /\.js(?:on)?$/i)) {
for (const key in this._bundles) {
this._bundles[key].then(bundle => {
const deps = bundleDeps.get(bundle);
filePaths.forEach(filePath => {
if (deps.files.has(filePath)) {
deps.outdated.add(filePath);
}
});
});
}
} else {
this._clearBundles();
}
this._informChangeWatchers();
}, 50);
}
@ -243,7 +274,25 @@ class Server {
}
const opts = bundleOpts(options);
return this._bundler.bundle(opts);
const building = this._bundler.bundle(opts);
building.then(bundle => {
const modules = bundle.getModules().filter(m => !m.virtual);
bundleDeps.set(bundle, {
files: new Map(
modules
.map(({sourcePath, meta = {dependencies: []}}) =>
[sourcePath, meta.dependencies])
),
idToIndex: new Map(modules.map(({id}, i) => [id, i])),
dependencyPairs: new Map(
modules
.filter(({meta}) => meta && meta.dependencyPairs)
.map(m => [m.sourcePath, m.meta.dependencyPairs])
),
outdated: new Set(),
});
});
return building;
});
}
@ -428,6 +477,91 @@ class Server {
).done(() => Activity.endEvent(assetEvent));
}
_useCachedOrUpdateOrCreateBundle(options) {
const optionsJson = JSON.stringify(options);
const bundleFromScratch = () => {
const building = this.buildBundle(options);
this._bundles[optionsJson] = building;
return building;
};
if (optionsJson in this._bundles) {
return this._bundles[optionsJson].then(bundle => {
const deps = bundleDeps.get(bundle);
const {dependencyPairs, files, idToIndex, outdated} = deps;
if (outdated.size) {
debug('Attempt to update existing bundle');
const changedModules =
Array.from(outdated, this.getModuleForPath, this);
deps.outdated = new Set();
const opts = bundleOpts(options);
const {platform, dev, minify, hot} = opts;
// Need to create a resolution response to pass to the bundler
// to process requires after transform. By providing a
// specific response we can compute a non recursive one which
// is the least we need and improve performance.
const bundlePromise = this._bundles[optionsJson] =
this.getDependencies({
platform, dev, hot, minify,
entryFile: options.entryFile,
recursive: false,
}).then(response => {
debug('Update bundle: rebuild shallow bundle');
changedModules.forEach(m => {
response.setResolvedDependencyPairs(
m,
dependencyPairs.get(m.path),
{ignoreFinalized: true},
);
});
return this.buildBundle({
...options,
resolutionResponse: response.copy({
dependencies: changedModules,
})
}).then(updateBundle => {
const oldModules = bundle.getModules();
const newModules = updateBundle.getModules();
for (let i = 0, n = newModules.length; i < n; i++) {
const moduleTransport = newModules[i];
const {meta, sourcePath} = moduleTransport;
if (outdated.has(sourcePath)) {
if (!contentsEqual(meta.dependencies, new Set(files.get(sourcePath)))) {
// bail out if any dependencies changed
return Promise.reject(Error(
`Dependencies of ${sourcePath} changed from [${
files.get(sourcePath).join(', ')
}] to [${meta.dependencies.join(', ')}]`
));
}
oldModules[idToIndex.get(moduleTransport.id)] = moduleTransport;
}
}
bundle.invalidateSource();
debug('Successfully updated existing bundle');
return bundle;
});
}).catch(e => {
debug('Failed to update existing bundle, rebuilding...', e.stack || e.message);
return bundleFromScratch();
});
return bundlePromise;
} else {
debug('Using cached bundle');
return bundle;
}
});
}
return bundleFromScratch();
}
processRequest(req, res, next) {
const urlObj = url.parse(req.url, true);
const pathname = urlObj.pathname;
@ -458,26 +592,29 @@ class Server {
const startReqEventId = Activity.startEvent('request:' + req.url);
const options = this._getOptionsFromUrl(req.url);
const optionsJson = JSON.stringify(options);
const building = this._bundles[optionsJson] || this.buildBundle(options);
this._bundles[optionsJson] = building;
debug('Getting bundle for request');
const building = this._useCachedOrUpdateOrCreateBundle(options);
building.then(
p => {
if (requestType === 'bundle') {
debug('Generating source code');
const bundleSource = p.getSource({
inlineSourceMap: options.inlineSourceMap,
minify: options.minify,
dev: options.dev,
});
debug('Writing response headers');
res.setHeader('Content-Type', 'application/javascript');
res.setHeader('ETag', p.getEtag());
if (req.headers['if-none-match'] === res.getHeader('ETag')){
debug('Responding with 304');
res.statusCode = 304;
res.end();
} else {
debug('Writing request body');
res.end(bundleSource);
}
debug('Finished response');
Activity.endEvent(startReqEventId);
} else if (requestType === 'map') {
let sourceMap = p.getSourceMap({
@ -499,7 +636,7 @@ class Server {
Activity.endEvent(startReqEventId);
}
},
this._handleError.bind(this, res, optionsJson)
error => this._handleError(res, JSON.stringify(options), error)
).done();
}
@ -564,9 +701,7 @@ class Server {
_sourceMapForURL(reqUrl) {
const options = this._getOptionsFromUrl(reqUrl);
const optionsJson = JSON.stringify(options);
const building = this._bundles[optionsJson] || this.buildBundle(options);
this._bundles[optionsJson] = building;
const building = this._useCachedOrUpdateOrCreateBundle(options);
return building.then(p => {
const sourceMap = p.getSourceMap({
minify: options.minify,
@ -659,4 +794,8 @@ class Server {
}
}
function contentsEqual(array, set) {
return array.length === set.size && array.every(set.has, set);
}
module.exports = Server;

6
react-packager/src/node-haste/DependencyGraph/ResolutionResponse.js vendored
View File

@ -8,6 +8,8 @@
*/
'use strict';
const NO_OPTIONS = {};
class ResolutionResponse {
constructor({transformOptions}) {
this.transformOptions = transformOptions;
@ -76,8 +78,10 @@ class ResolutionResponse {
this.numPrependedDependencies += 1;
}
setResolvedDependencyPairs(module, pairs) {
setResolvedDependencyPairs(module, pairs, options = NO_OPTIONS) {
if (!options.ignoreFinalized) {
this._assertNotFinalized();
}
const hash = module.hash();
if (this._mappings[hash] == null) {
this._mappings[hash] = pairs;