352 lines
9.7 KiB
JavaScript
352 lines
9.7 KiB
JavaScript
'use strict';
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const Module = require('module');
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const crypto = require('crypto');
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const fs = require('fs');
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const path = require('path');
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const vm = require('vm');
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const os = require('os');
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const hasOwnProperty = Object.prototype.hasOwnProperty;
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//------------------------------------------------------------------------------
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// FileSystemBlobStore
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//------------------------------------------------------------------------------
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class FileSystemBlobStore {
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constructor(directory, prefix) {
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const name = prefix ? slashEscape(prefix + '.') : '';
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this._blobFilename = path.join(directory, name + 'BLOB');
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this._mapFilename = path.join(directory, name + 'MAP');
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this._lockFilename = path.join(directory, name + 'LOCK');
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this._directory = directory;
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this._load();
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}
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has(key, invalidationKey) {
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if (hasOwnProperty.call(this._memoryBlobs, key)) {
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return this._invalidationKeys[key] === invalidationKey;
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} else if (hasOwnProperty.call(this._storedMap, key)) {
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return this._storedMap[key][0] === invalidationKey;
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}
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return false;
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}
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get(key, invalidationKey) {
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if (hasOwnProperty.call(this._memoryBlobs, key)) {
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if (this._invalidationKeys[key] === invalidationKey) {
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return this._memoryBlobs[key];
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}
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} else if (hasOwnProperty.call(this._storedMap, key)) {
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const mapping = this._storedMap[key];
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if (mapping[0] === invalidationKey) {
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return this._storedBlob.slice(mapping[1], mapping[2]);
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}
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}
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}
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set(key, invalidationKey, buffer) {
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this._invalidationKeys[key] = invalidationKey;
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this._memoryBlobs[key] = buffer;
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this._dirty = true;
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}
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delete(key) {
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if (hasOwnProperty.call(this._memoryBlobs, key)) {
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this._dirty = true;
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delete this._memoryBlobs[key];
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}
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if (hasOwnProperty.call(this._invalidationKeys, key)) {
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this._dirty = true;
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delete this._invalidationKeys[key];
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}
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if (hasOwnProperty.call(this._storedMap, key)) {
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this._dirty = true;
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delete this._storedMap[key];
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}
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}
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isDirty() {
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return this._dirty;
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}
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save() {
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const dump = this._getDump();
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const blobToStore = Buffer.concat(dump[0]);
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const mapToStore = JSON.stringify(dump[1]);
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try {
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mkdirpSync(this._directory);
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fs.writeFileSync(this._lockFilename, 'LOCK', {flag: 'wx'});
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} catch (error) {
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// Swallow the exception if we fail to acquire the lock.
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return false;
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}
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try {
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fs.writeFileSync(this._blobFilename, blobToStore);
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fs.writeFileSync(this._mapFilename, mapToStore);
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} catch (error) {
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throw error;
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} finally {
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fs.unlinkSync(this._lockFilename);
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}
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return true;
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}
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_load() {
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try {
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this._storedBlob = fs.readFileSync(this._blobFilename);
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this._storedMap = JSON.parse(fs.readFileSync(this._mapFilename));
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} catch (e) {
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this._storedBlob = Buffer.alloc(0);
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this._storedMap = {};
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}
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this._dirty = false;
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this._memoryBlobs = {};
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this._invalidationKeys = {};
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}
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_getDump() {
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const buffers = [];
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const newMap = {};
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let offset = 0;
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function push(key, invalidationKey, buffer) {
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buffers.push(buffer);
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newMap[key] = [invalidationKey, offset, offset + buffer.length];
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offset += buffer.length;
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}
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for (const key of Object.keys(this._memoryBlobs)) {
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const buffer = this._memoryBlobs[key];
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const invalidationKey = this._invalidationKeys[key];
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push(key, invalidationKey, buffer);
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}
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for (const key of Object.keys(this._storedMap)) {
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if (hasOwnProperty.call(newMap, key)) continue;
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const mapping = this._storedMap[key];
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const buffer = this._storedBlob.slice(mapping[1], mapping[2]);
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push(key, mapping[0], buffer);
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}
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return [buffers, newMap];
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}
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}
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//------------------------------------------------------------------------------
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// NativeCompileCache
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//------------------------------------------------------------------------------
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class NativeCompileCache {
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constructor() {
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this._cacheStore = null;
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this._previousModuleCompile = null;
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}
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setCacheStore(cacheStore) {
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this._cacheStore = cacheStore;
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}
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install() {
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const self = this;
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this._previousModuleCompile = Module.prototype._compile;
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Module.prototype._compile = function(content, filename) {
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const mod = this;
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function require(id) {
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return mod.require(id);
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}
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require.resolve = function(request) {
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return Module._resolveFilename(request, mod);
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};
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require.main = process.mainModule;
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// Enable support to add extra extension types
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require.extensions = Module._extensions;
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require.cache = Module._cache;
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const dirname = path.dirname(filename);
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const compiledWrapper = self._moduleCompile(filename, content);
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// We skip the debugger setup because by the time we run, node has already
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// done that itself.
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const args = [mod.exports, require, mod, filename, dirname, process, global];
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return compiledWrapper.apply(mod.exports, args);
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};
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}
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uninstall() {
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Module.prototype._compile = this._previousModuleCompile;
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}
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_moduleCompile(filename, content) {
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// https://github.com/nodejs/node/blob/v7.5.0/lib/module.js#L511
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// Remove shebang
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var contLen = content.length;
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if (contLen >= 2) {
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if (content.charCodeAt(0) === 35/*#*/ &&
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content.charCodeAt(1) === 33/*!*/) {
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if (contLen === 2) {
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// Exact match
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content = '';
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} else {
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// Find end of shebang line and slice it off
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var i = 2;
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for (; i < contLen; ++i) {
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var code = content.charCodeAt(i);
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if (code === 10/*\n*/ || code === 13/*\r*/) break;
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}
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if (i === contLen) {
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content = '';
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} else {
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// Note that this actually includes the newline character(s) in the
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// new output. This duplicates the behavior of the regular
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// expression that was previously used to replace the shebang line
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content = content.slice(i);
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}
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}
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}
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}
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// create wrapper function
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var wrapper = Module.wrap(content);
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var invalidationKey = crypto
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.createHash('sha1')
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.update(content, 'utf8')
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.digest('hex');
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var buffer = this._cacheStore.get(filename, invalidationKey);
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var script = new vm.Script(wrapper, {
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filename: filename,
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lineOffset: 0,
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displayErrors: true,
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cachedData: buffer,
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produceCachedData: true,
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});
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if (script.cachedDataProduced) {
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this._cacheStore.set(filename, invalidationKey, script.cachedData);
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} else if (script.cachedDataRejected) {
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this._cacheStore.delete(filename);
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}
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var compiledWrapper = script.runInThisContext({
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filename: filename,
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lineOffset: 0,
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columnOffset: 0,
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displayErrors: true,
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});
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return compiledWrapper;
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}
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}
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//------------------------------------------------------------------------------
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// utilities
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//
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// https://github.com/substack/node-mkdirp/blob/f2003bb/index.js#L55-L98
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// https://github.com/zertosh/slash-escape/blob/e7ebb99/slash-escape.js
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//------------------------------------------------------------------------------
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function mkdirpSync(p_) {
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_mkdirpSync(path.resolve(p_), parseInt('0777', 8) & ~process.umask());
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}
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function _mkdirpSync(p, mode) {
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try {
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fs.mkdirSync(p, mode);
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} catch (err0) {
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if (err0.code === 'ENOENT') {
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_mkdirpSync(path.dirname(p));
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_mkdirpSync(p);
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} else {
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try {
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const stat = fs.statSync(p);
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if (!stat.isDirectory()) { throw err0; }
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} catch (err1) {
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throw err0;
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}
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}
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}
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}
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function slashEscape(str) {
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const ESCAPE_LOOKUP = {
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'\\': 'zB',
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':': 'zC',
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'/': 'zS',
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'\x00': 'z0',
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'z': 'zZ',
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};
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return str.replace(/[\\:\/\x00z]/g, match => (ESCAPE_LOOKUP[match]));
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}
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function supportsCachedData() {
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const script = new vm.Script('""', {produceCachedData: true});
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// chakracore, as of v1.7.1.0, returns `false`.
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return script.cachedDataProduced === true;
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}
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function getCacheDir() {
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// Avoid cache ownership issues on POSIX systems.
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const dirname = typeof process.getuid === 'function'
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? 'v8-compile-cache-' + process.getuid()
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: 'v8-compile-cache';
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const version = typeof process.versions.v8 === 'string'
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? process.versions.v8
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: typeof process.versions.chakracore === 'string'
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? 'chakracore-' + process.versions.chakracore
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: 'node-' + process.version;
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const cacheDir = path.join(os.tmpdir(), dirname, version);
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return cacheDir;
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}
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function getParentName() {
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// `module.parent.filename` is undefined or null when:
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// * node -e 'require("v8-compile-cache")'
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// * node -r 'v8-compile-cache'
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// * Or, requiring from the REPL.
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const parentName = module.parent && typeof module.parent.filename === 'string'
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? module.parent.filename
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: process.cwd();
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return parentName;
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}
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//------------------------------------------------------------------------------
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// main
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//------------------------------------------------------------------------------
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if (!process.env.DISABLE_V8_COMPILE_CACHE && supportsCachedData()) {
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const cacheDir = getCacheDir();
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const prefix = getParentName();
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const blobStore = new FileSystemBlobStore(cacheDir, prefix);
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const nativeCompileCache = new NativeCompileCache();
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nativeCompileCache.setCacheStore(blobStore);
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nativeCompileCache.install();
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process.once('exit', code => {
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if (blobStore.isDirty()) {
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blobStore.save();
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}
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nativeCompileCache.uninstall();
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});
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}
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module.exports.__TEST__ = {
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FileSystemBlobStore,
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NativeCompileCache,
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mkdirpSync,
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slashEscape,
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supportsCachedData,
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getCacheDir,
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getParentName,
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};
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