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module_wrap.cc
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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),
Integer::New(iso, 0),
False(iso),
Integer::New(iso, 0),
FIXED_ONE_BYTE_STRING(iso, ""),
False(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->Thro
8000
wError("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)