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'use strict';
const {
Error,
ObjectDefineProperty,
ObjectGetOwnPropertyDescriptor,
ObjectSetPrototypeOf,
SafeArrayIterator,
SafeSet,
StringPrototypeStartsWith,
StringPrototypeSlice,
} = primordials;
const binding = internalBinding('mksnapshot');
const { BuiltinModule } = require('internal/bootstrap/realm');
const {
getEmbedderEntryFunction,
compileSerializeMain,
} = binding;
const {
getOptionValue,
} = require('internal/options');
const {
readFileSync,
} = require('fs');
const supportedModules = new SafeSet(new SafeArrayIterator([
// '_http_agent',
// '_http_client',
// '_http_common',
// '_http_incoming',
// '_http_outgoing',
// '_http_server',
'_stream_duplex',
'_stream_passthrough',
'_stream_readable',
'_stream_transform',
'_stream_wrap',
'_stream_writable',
// '_tls_common',
// '_tls_wrap',
'assert',
'assert/strict',
// 'async_hooks',
'buffer',
// 'child_process',
// 'cluster',
'console',
'constants',
'crypto',
// 'dgram',
'diagnostics_channel',
'dns',
// 'dns/promises',
// 'domain',
'events',
'fs',
'fs/promises',
// 'http',
// 'http2',
// 'https',
// 'inspector',
// 'module',
'net',
'os',
'path',
'path/posix',
'path/win32',
// 'perf_hooks',
'process',
'punycode',
'querystring',
// 'readline',
// 'repl',
'stream',
'stream/promises',
'string_decoder',
'sys',
'timers',
'timers/promises',
// 'tls',
// 'trace_events',
// 'tty',
'url',
'util',
'util/types',
'v8',
// 'vm',
// 'worker_threads',
'zlib',
]));
const warnedModules = new SafeSet();
function supportedInUserSnapshot(id) {
return supportedModules.has(id);
}
function requireForUserSnapshot(id) {
let normalizedId = id;
if (StringPrototypeStartsWith(id, 'node:')) {
normalizedId = StringPrototypeSlice(id, 5);
}
if (!BuiltinModule.canBeRequiredByUsers(normalizedId) ||
(id !== normalizedId &&
!BuiltinModule.canBeRequiredWithoutScheme(normalizedId))) {
// eslint-disable-next-line no-restricted-syntax
const err = new Error(
`Cannot find module '${id}'. `,
);
err.code = 'MODULE_NOT_FOUND';
throw err;
}
if (!supportedInUserSnapshot(normalizedId)) {
if (!warnedModules.has(normalizedId)) {
process.emitWarning(
`built-in module ${id} is not yet supported in user snapshots`);
warnedModules.add(normalizedId);
}
}
return require(normalizedId);
}
function main() {
const {
prepareMainThreadExecution,
} = require('internal/process/pre_execution');
const path = require('path');
let serializeMainFunction = getEmbedderEntryFunction();
const serializeMainArgs = [requireForUserSnapshot];
if (serializeMainFunction) { // embedded case
prepareMainThreadExecution(false, false);
// TODO(addaleax): Make this `embedderRunCjs` once require('module')
// is supported in snapshots.
const filename = process.execPath;
const dirname = path.dirname(filename);
function minimalRunCjs(source) {
const fn = compileSerializeMain(filename, source);
return fn(requireForUserSnapshot, filename, dirname);
}
serializeMainArgs.push(minimalRunCjs);
} else {
prepareMainThreadExecution(true, false);
const file = process.argv[1];
const filename = path.resolve(file);
const dirname = path.dirname(filename);
const source = readFileSync(file, 'utf-8');
serializeMainFunction = compileSerializeMain(filename, source);
serializeMainArgs.push(filename, dirname);
}
const {
initializeCallbacks,
namespace: {
addSerializeCallback,
addDeserializeCallback,
},
} = require('internal/v8/startup_snapshot');
initializeCallbacks();
let stackTraceLimitDesc;
addDeserializeCallback(() => {
if (stackTraceLimitDesc !== undefined) {
ObjectDefineProperty(Error, 'stackTraceLimit', stackTraceLimitDesc);
}
});
if (getOptionValue('--inspect-brk')) {
internalBinding('inspector').callAndPauseOnStart(
serializeMainFunction, undefined, ...serializeMainArgs);
} else {
serializeMainFunction(...serializeMainArgs);
}
addSerializeCallback(() => {
stackTraceLimitDesc = ObjectGetOwnPropertyDescriptor(Error, 'stackTraceLimit');
if (stackTraceLimitDesc !== undefined) {
// We want to use null-prototype objects to not rely on globally mutable
// %Object.prototype%.
ObjectSetPrototypeOf(stackTraceLimitDesc, null);
process._rawDebug('Deleting Error.stackTraceLimit from the snapshot. ' +
'It will be re-installed after deserialization');
delete Error.stackTraceLimit;
}
});
}
main();
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