node/src/module_wrap.cc at test-https-req-split · BruceFletcher/node · GitHub

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#include <algorithm>

#include <limits.h> // PATH_MAX

#include <sys/stat.h> // S_IFDIR

#include "module_wrap.h"

#include "env.h"

#include "node_url.h"

#include "util.h"

#include "util-inl.h"

namespace node {

namespace loader {

using node::url::URL;

using node::url::URL_FLAGS_FAILED;

using v8::Context;

using v8::EscapableHandleScope;

using v8::Function;

using v8::FunctionCallbackInfo;

using v8::FunctionTemplate;

using v8::HandleScope;

using v8::Integer;

using v8::IntegrityLevel;

using v8::Isolate;

using v8::JSON;

using v8::Local;

using v8::Maybe;

using v8::MaybeLocal;

using v8::Module;

using v8::Object;

using v8::Promise;

using v8::ScriptCompiler;

using v8::ScriptOrigin;

using v8::String;

using v8::Value;

static const char* const EXTENSIONS[] = {".mjs", ".js", ".json", ".node"};

ModuleWrap::ModuleWrap(Environment* env,

Local<Object> object,

Local<Module> module,

Local<String> url) : BaseObject(env, object) {

module_.Reset(env->isolate(), module);

url_.Reset(env->isolate(), url);

}

ModuleWrap::~ModuleWrap() {

HandleScope scope(env()->isolate());

Local<Module> module = module_.Get(env()->isolate());

auto range = env()->module_map.equal_range(module->GetIdentityHash());

for (auto it = range.first; it != range.second; ++it) {

if (it->second == this) {

env()->module_map.erase(it);

break;

}

module_.Reset();

}

void ModuleWrap::New(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

Isolate* iso = args.GetIsolate();

if (!args.IsConstructCall()) {

env->ThrowError("constructor must be called using new");

return;

}

if (args.Length() != 2) {

env->ThrowError("constructor must have exactly 2 arguments "

"(string, string)");

return;

}

if (!args[0]->IsString()) {

env->ThrowError("first argument is not a string");

return;

}

auto source_text = args[0].As<String>();

if (!args[1]->IsString()) {

env->ThrowError("second argument is not a string");

return;

}

Local<String> url = args[1].As<String>();

Local<Module> mod;

// compile

{

ScriptOrigin origin(url,

Integer::New(iso, 0),

False(iso),

Integer::New(iso, 0),

FIXED_ONE_BYTE_STRING(iso, ""),

False(iso),

True(iso));

ScriptCompiler::Source source(source_text, origin);

auto maybe_mod = ScriptCompiler::CompileModule(iso, &source);

if (maybe_mod.IsEmpty()) {

return;

}

mod = maybe_mod.ToLocalChecked();

}

auto that = args.This();

auto ctx = that->CreationContext();

auto url_str = FIXED_ONE_BYTE_STRING(iso, "url");

if (!that->Set(ctx, url_str, url).FromMaybe(false)) {

return;

}

ModuleWrap* obj =

new ModuleWrap(Environment::GetCurrent(ctx), that, mod, url);

env->module_map.emplace(mod->GetIdentityHash(), obj);

Wrap(that, obj);

that->SetIntegrityLevel(ctx, IntegrityLevel::kFrozen);

args.GetReturnValue().Set(that);

}

void ModuleWrap::Link(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

Isolate* iso = args.GetIsolate();

EscapableHandleScope handle_scope(iso);

if (!args[0]->IsFunction()) {

env->ThrowError("first argument is not a function");

return;

}

Local<Function> resolver_arg = args[0].As<Function>();

auto that = args.This();

ModuleWrap* obj = Unwrap<ModuleWrap>(that);

auto mod_context = that->CreationContext();

if (obj->linked_) return;

obj->linked_ = true;

Local<Module> mod(obj->module_.Get(iso));

// call the dependency resolve callbacks

for (int i = 0; i < mod->GetModuleRequestsLength(); i++) {

Local<String> specifier = mod->GetModuleRequest(i);

Utf8Value specifier_utf(env->isolate(), specifier);

std::string specifier_std(*specifier_utf, specifier_utf.length());

Local<Value> argv[] = {

specifier

};

MaybeLocal<Value> maybe_resolve_return_value =

resolver_arg->Call(mod_context, that, 1, argv);

if (maybe_resolve_return_value.IsEmpty()) {

return;

}

Local<Value> resolve_return_value =

maybe_resolve_return_value.ToLocalChecked();

if (!resolve_return_value->IsPromise()) {

env->ThrowError("linking error, expected resolver to return a promise");

}

Local<Promise> resolve_promise = resolve_return_value.As<Promise>();

obj->resolve_cache_[specifier_std].Reset(env->isolate(), resolve_promise);

}

args.GetReturnValue().Set(handle_scope.Escape(that));

}

void ModuleWrap::Instantiate(const FunctionCallbackInfo<Value>& args) {

auto iso = args.GetIsolate();

auto that = args.This();

auto ctx = that->CreationContext();

ModuleWrap* obj = Unwrap<ModuleWrap>(that);

Local<Module> mod = obj->module_.Get(iso);

Maybe<bool> ok = mod->InstantiateModule(ctx, ModuleWrap::ResolveCallback);

// clear resolve cache on instantiate

for (auto& entry : obj->resolve_cache_)

entry.second.Reset();

obj->resolve_cache_.clear();

if (!ok.FromMaybe(false)) {

return;

}

void ModuleWrap::Evaluate(const FunctionCallbackInfo<Value>& args) {

auto iso = args.GetIsolate();

auto that = args.This();

auto ctx = that->CreationContext();

ModuleWrap* obj = Unwrap<ModuleWrap>(that);

auto result = obj->module_.Get(iso)->Evaluate(ctx);

if (result.IsEmpty()) {

return;

}

auto ret = result.ToLocalChecked();

args.GetReturnValue().Set(ret);

}

MaybeLocal<Module> ModuleWrap::ResolveCallback(Local<Context> context,

Local<String> specifier,

Local<Module> referrer) {

Environment* env = Environment::GetCurrent(context);

Isolate* iso = Isolate::GetCurrent();

if (env->module_map.count(referrer->GetIdentityHash()) == 0) {

env->ThrowError("linking error, unknown module");

return MaybeLocal<Module>();

}

ModuleWrap* dependent = nullptr;

auto range = env->module_map.equal_range(referrer->GetIdentityHash());

for (auto it = range.first; it != range.second; ++it) {

if (it->second->module_ == referrer) {

dependent = it->second;

break;

}

if (dependent == nullptr) {

env->ThrowError("linking error, null dep");

return MaybeLocal<Module>();

}

Utf8Value specifier_utf(env->isolate(), specifier);

std::string specifier_std(*specifier_utf, specifier_utf.length());

if (dependent->resolve_cache_.count(specifier_std) != 1) {

env->ThrowError("linking error, not in local cache");

return MaybeLocal<Module>();

}

Local<Promise> resolve_promise =

dependent->resolve_cache_[specifier_std].Get(iso);

if (resolve_promise->State() != Promise::kFulfilled) {

env->ThrowError("linking error, dependency promises must be resolved on "

"instantiate");

return MaybeLocal<Module>();

}

auto module_object = resolve_promise->Result().As<Object>();

if (module_object.IsEmpty() || !module_object->IsObject()) {

env->ThrowError("linking error, expected a valid module object from "

"resolver");

return MaybeLocal<Module>();

}

ModuleWrap* mod;

ASSIGN_OR_RETURN_UNWRAP(&mod, module_object, MaybeLocal<Module>());

return mod->module_.Get(env->isolate());

}

namespace {

URL __init_cwd() {

std::string specifier = "file://";

#ifdef _WIN32

// MAX_PATH is in characters, not bytes. Make sure we have enough headroom.

char buf[MAX_PATH * 4];

#else

char buf[PATH_MAX];

#endif

size_t cwd_len = sizeof(buf);

int err = uv_cwd(buf, &cwd_len);

if (err) {

return URL("");

}

specifier += buf;

specifier += "/";

return URL(specifier);

}

static URL INITIAL_CWD(__init_cwd());

inline bool is_relative_or_absolute_path(std::string specifier) {

auto len = specifier.length();

if (len <= 0) {

return false;

} else if (specifier[0] == '/') {

return true;

} else if (specifier[0] == '.') {

if (len == 1 || specifier[1] == '/') {

return true;

} else if (specifier[1] == '.') {

if (len == 2 || specifier[2] == '/') {

return true;

}

return false;

}

struct read_result {

bool had_error = false;

std::string source;

} read_result;

inline const struct read_result read_file(uv_file file) {

struct read_result ret;

std::string src;

uv_fs_t req;

void* base = malloc(4096);

if (base == nullptr) {

ret.had_error = true;

return ret;

}

uv_buf_t buf = uv_buf_init(static_cast<char*>(base), 4096);

uv_fs_read(uv_default_loop(), &req, file, &buf, 1, 0, nullptr);

while (req.result > 0) {

src += std::string(static_cast<const char*>(buf.base), req.result);

uv_fs_read(uv_default_loop(), &req, file, &buf, 1, src.length(), nullptr);

}

ret.source = src;

return ret;

}

struct file_check {

bool failed = true;

uv_file file = -1;

};

inline const struct file_check check_file(const URL& search,

bool close = false,

bool allow_dir = false) {

struct file_check ret;

uv_fs_t fs_req;

std::string path = search.ToFilePath();

if (path.empty()) {

return ret;

}

uv_fs_open(nullptr, &fs_req, path.c_str(), O_RDONLY, 0, nullptr);

auto fd = fs_req.result;

if (fd < 0) {

return ret;

}

if (!allow_dir) {

uv_fs_fstat(nullptr, &fs_req, fd, nullptr);

if (fs_req.statbuf.st_mode & S_IFDIR) {

uv_fs_close(nullptr, &fs_req, fd, nullptr);

return ret;

}

ret.failed = false;

ret.file = fd;

if (close) uv_fs_close(nullptr, &fs_req, fd, nullptr);

return ret;

}

URL resolve_extensions(const URL& search, bool check_exact = true) {

if (check_exact) {

auto check = check_file(search, true);

if (!check.failed) {

return search;

}

for (auto extension : EXTENSIONS) {

URL guess(search.path() + extension, &search);

auto check = check_file(guess, true);

if (!check.failed) {

return guess;

}

return URL("");

}

inline URL resolve_index(const URL& search) {

return resolve_extensions(URL("index", &search), false);

}

URL resolve_main(const URL& search) {

URL pkg("package.json", &search);

auto check = check_file(pkg);

if (!check.failed) {

auto iso = Isolate::GetCurrent();

auto ctx = iso->GetCurrentContext();

auto read = read_file(check.file);

uv_fs_t fs_req;

// if we fail to close :-/

uv_fs_close(nullptr, &fs_req, check.file, nullptr);

if (read.had_error) return URL("");

std::string pkg_src = read.source;

Local<String> src =

String::NewFromUtf8(iso, pkg_src.c_str(),

String::kNormalString, pkg_src.length());

if (src.IsEmpty()) return URL("");

auto maybe_pkg_json = JSON::Parse(ctx, src);

if (maybe_pkg_json.IsEmpty()) return URL("");

auto pkg_json_obj = maybe_pkg_json.ToLocalChecked().As<Object>();

if (!pkg_json_obj->IsObject()) return URL("");

auto maybe_pkg_main = pkg_json_obj->Get(

ctx, FIXED_ONE_BYTE_STRING(iso, "main"));

if (maybe_pkg_main.IsEmpty()) return URL("");

auto pkg_main_str = maybe_pkg_main.ToLocalChecked().As<String>();

if (!pkg_main_str->IsString()) return URL("");

Utf8Value main_utf8(iso, pkg_main_str);

std::string main_std(*main_utf8, main_utf8.length());

if (!is_relative_or_absolute_path(main_std)) {

main_std.insert(0, "./");

}

return Resolve(main_std, &search);

}

return URL("");

}

URL resolve_module(std::string specifier, const URL* base) {

URL parent(".", base);

URL dir("");

do {

dir = parent;

auto check = Resolve("./node_modules/" + specifier, &dir, true);

if (!(check.flags() & URL_FLAGS_FAILED)) {

const auto limit = specifier.find('/');

const auto spec_len = limit == std::string::npos ?

specifier.length() :

limit + 1;

std::string chroot =

dir.path() + "node_modules/" + specifier.substr(0, spec_len);

if (check.path().substr(0, chroot.length()) != chroot) {

return URL("");

}

return check;

} else {

// TODO(bmeck) PREVENT FALLTHROUGH

}

parent = URL("..", &dir);

} while (parent.path() != dir.path());

return URL("");

}

URL resolve_directory(const URL& search, bool read_pkg_json) {

if (read_pkg_json) {

auto main = resolve_main(search);

if (!(main.flags() & URL_FLAGS_FAILED)) return main;

}

return resolve_index(search);

}

} // anonymous namespace

URL Resolve(std::string specifier, const URL* base, bool read_pkg_json) {

URL pure_url(specifier);

if (!(pure_url.flags() & URL_FLAGS_FAILED)) {

return pure_url;

}

if (specifier.length() == 0) {

return URL("");

}

if (is_relative_or_absolute_path(specifier)) {

URL resolved(specifier, base);

auto file = resolve_extensions(resolved);

if (!(file.flags() & URL_FLAGS_FAILED)) return file;

if (specifier.back() != '/') {

resolved = URL(specifier + "/", base);

}

return resolve_directory(resolved, read_pkg_json);

} else {

return resolve_module(specifier, base);

}

UNREACHABLE();

}

void ModuleWrap::Resolve(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

if (args.IsConstructCall()) {

env->ThrowError("resolve() must not be called as a constructor");

return;

}

if (args.Length() != 2) {

env->ThrowError("resolve must have exactly 2 arguments (string, string)");

return;

}

if (!args[0]->IsString()) {

env->ThrowError("first argument is not a string");

return;

}

Utf8Value specifier_utf(env->isolate(), args[0]);

if (!args[1]->IsString()) {

env->ThrowError("second argument is not a string");

return;

}

Utf8Value url_utf(env->isolate(), args[1]);

URL url(*url_utf, url_utf.length());

if (url.flags() & URL_FLAGS_FAILED) {

env->ThrowError("second argument is not a URL string");

return;

}

URL result = node::loader::Resolve(*specifier_utf, &url, true);

if (result.flags() & URL_FLAGS_FAILED) {

std::string msg = "module ";

msg += *specifier_utf;

msg += " not found";

env->ThrowError(msg.c_str());

return;

}

args.GetReturnValue().Set(result.ToObject(env));

}

void ModuleWrap::Initialize(Local<Object> target,

Local<Value> unused,

Local<Context> context) {

Environment* env = Environment::GetCurrent(context);

Isolate* isolate = env->isolate();

Local<FunctionTemplate> tpl = env->NewFunctionTemplate(New);

tpl->SetClassName(FIXED_ONE_BYTE_STRING(isolate, "ModuleWrap"));

tpl->InstanceTemplate()->SetInternalFieldCount(1);

env->SetProtoMethod(tpl, "link", Link);

env->SetProtoMethod(tpl, "instantiate", Instantiate);

env->SetProtoMethod(tpl, "evaluate", Evaluate);

target->Set(FIXED_ONE_BYTE_STRING(isolate, "ModuleWrap"), tpl->GetFunction());

env->SetMethod(target, "resolve", node::loader::ModuleWrap::Resolve);

}

} // namespace loader

} // namespace node

NODE_MODULE_CONTEXT_AWARE_BUILTIN(module_wrap,

node::loader::ModuleWrap::Initialize)

node/src/module_wrap.cc at test-https-req-split · BruceFletcher/node · GitHub

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