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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "node_file.h" // NOLINT(build/include_inline)
#include "node_file-inl.h"
#include "aliased_buffer.h"
#include "memory_tracker-inl.h"
#include "node_buffer.h"
#include "node_process.h"
#include "node_stat_watcher.h"
#include "util-inl.h"
#include "tracing/trace_event.h"
#include "req_wrap-inl.h"
#include "stream_base-inl.h"
#include "string_bytes.h"
#include "string_search.h"
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <cstring>
#include <cerrno>
#include <climits>
#if defined(__MINGW32__) || defined(_MSC_VER)
# include <io.h>
#endif
#include <memory>
namespace node {
namespace fs {
using v8::Array;
using v8::Context;
using v8::EscapableHandleScope;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Int32;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::Number;
using v8::Object;
using v8::ObjectTemplate;
using v8::Promise;
using v8::String;
using v8::Symbol;
using v8::Uint32;
using v8::Undefined;
using v8::Value;
#ifndef S_ISDIR
# define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#endif
#ifdef __POSIX__
constexpr char kPathSeparator = '/';
#else
const char* const kPathSeparator = "\\/";
#endif
inline int64_t GetOffset(Local<Value> value) {
return IsSafeJsInt(value) ? value.As<Integer>()->Value() : -1;
}
#define TRACE_NAME(name) "fs.sync." #name
#define GET_TRACE_ENABLED \
(*TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED \
(TRACING_CATEGORY_NODE2(fs, sync)) != 0)
#define FS_SYNC_TRACE_BEGIN(syscall, ...) \
if (GET_TRACE_ENABLED) \
TRACE_EVENT_BEGIN(TRACING_CATEGORY_NODE2(fs, sync), TRACE_NAME(syscall), \
##__VA_ARGS__);
#define FS_SYNC_TRACE_END(syscall, ...) \
if (GET_TRACE_ENABLED) \
TRACE_EVENT_END(TRACING_CATEGORY_NODE2(fs, sync), TRACE_NAME(syscall), \
##__VA_ARGS__);
// We sometimes need to convert a C++ lambda function to a raw C-style function.
// This is helpful, because ReqWrap::Dispatch() does not recognize lambda
// functions, and thus does not wrap them properly.
typedef void(*uv_fs_callback_t)(uv_fs_t*);
void FSContinuationData::MemoryInfo(MemoryTracker* tracker) const {
tracker->TrackField("paths", paths_);
}
FileHandleReadWrap::~FileHandleReadWrap() {}
FSReqBase::~FSReqBase() {}
void FSReqBase::MemoryInfo(MemoryTracker* tracker) const {
tracker->TrackField("continuation_data", continuation_data_);
}
// The FileHandle object wraps a file descriptor and will close it on garbage
// collection if necessary. If that happens, a process warning will be
// emitted (or a fatal exception will occur if the fd cannot be closed.)
FileHandle::FileHandle(Environment* env, Local<Object> obj, int fd)
: AsyncWrap(env, obj, AsyncWrap::PROVIDER_FILEHANDLE),
StreamBase(env),
fd_(fd) {
MakeWeak();
StreamBase::AttachToObject(GetObject());
}
FileHandle* FileHandle::New(Environment* env, int fd, Local<Object> obj) {
if (obj.IsEmpty() && !env->fd_constructor_template()
->NewInstance(env->context())
.ToLocal(&obj)) {
return nullptr;
}
return new FileHandle(env, obj, fd);
}
void FileHandle::New(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args.IsConstructCall());
CHECK(args[0]->IsInt32());
FileHandle* handle =
FileHandle::New(env, args[0].As<Int32>()->Value(), args.This());
if (handle == nullptr) return;
if (args[1]->IsNumber())
handle->read_offset_ = args[1]->IntegerValue(env->context()).FromJust();
if (args[2]->IsNumber())
handle->read_length_ = args[2]->IntegerValue(env->context()).FromJust();
}
FileHandle::~FileHandle() {
CHECK(!closing_); // We should not be deleting while explicitly closing!
Close(); // Close synchronously and emit warning
CHECK(closed_); // We have to be closed at the point
}
int FileHandle::DoWrite(WriteWrap* w,
uv_buf_t* bufs,
size_t count,
uv_stream_t* send_handle) {
return UV_ENOSYS; // Not implemented (yet).
}
void FileHandle::MemoryInfo(MemoryTracker* tracker) const {
tracker->TrackField("current_read", current_read_);
}
// Close the file descriptor if it hasn't already been closed. A process
// warning will be emitted using a SetImmediate to avoid calling back to
// JS during GC. If closing the fd fails at this point, a fatal exception
// will crash the process immediately.
inline void FileHandle::Close() {
if (closed_) return;
uv_fs_t req;
int ret = uv_fs_close(env()->event_loop(), &req, fd_, nullptr);
uv_fs_req_cleanup(&req);
struct err_detail { int ret; int fd; };
err_detail detail { ret, fd_ };
AfterClose();
if (ret < 0) {
// Do not unref this
env()->SetImmediate([detail](Environment* env) {
char msg[70];
snprintf(msg, arraysize(msg),
"Closing file descriptor %d on garbage collection failed",
detail.fd);
// This exception will end up being fatal for the process because
// it is being thrown from within the SetImmediate handler and
// there is no JS stack to bubble it to. In other words, tearing
// down the process is the only reasonable thing we can do here.
HandleScope handle_scope(env->isolate());
env->ThrowUVException(detail.ret, "close", msg);
});
return;
}
// If the close was successful, we still want to emit a process warning
// to notify that the file descriptor was gc'd. We want to be noisy about
// this because not explicitly closing the FileHandle is a bug.
env()->SetUnrefImmediate([detail](Environment* env) {
ProcessEmitWarning(env,
"Closing file descriptor %d on garbage collection",
detail.fd);
});
}
void FileHandle::CloseReq::Resolve() {
Isolate* isolate = env()->isolate();
HandleScope scope(isolate);
InternalCallbackScope callback_scope(this);
Local<Promise> promise = promise_.Get(isolate);
Local<Promise::Resolver> resolver = promise.As<Promise::Resolver>();
resolver->Resolve(env()->context(), Undefined(isolate)).Check();
}
void FileHandle::CloseReq::Reject(Local<Value> reason) {
Isolate* isolate = env()->isolate();
HandleScope scope(isolate);
InternalCallbackScope callback_scope(this);
Local<Promise> promise = promise_.Get(isolate);
Local<Promise::Resolver> resolver = promise.As<Promise::Resolver>();
resolver->Reject(env()->context(), reason).Check();
}
FileHandle* FileHandle::CloseReq::file_handle() {
Isolate* isolate = env()->isolate();
HandleScope scope(isolate);
Local<Value> val = ref_.Get(isolate);
Local<Object> obj = val.As<Object>();
return Unwrap<FileHandle>(obj);
}
FileHandle::CloseReq::CloseReq(Environment* env,
Local<Object> obj,
Local<Promise> promise,
Local<Value> ref)
: ReqWrap(env, obj, AsyncWrap::PROVIDER_FILEHANDLECLOSEREQ) {
promise_.Reset(env->isolate(), promise);
ref_.Reset(env->isolate(), ref);
}
FileHandle::CloseReq::~CloseReq() {
uv_fs_req_cleanup(req());
promise_.Reset();
ref_.Reset();
}
void FileHandle::CloseReq::MemoryInfo(MemoryTracker* tracker) const {
tracker->TrackField("promise", promise_);
tracker->TrackField("ref", ref_);
}
// Closes this FileHandle asynchronously and returns a Promise that will be
// resolved when the callback is invoked, or rejects with a UVException if
// there was a problem closing the fd. This is the preferred mechanism for
// closing the FD object even tho the object will attempt to close
// automatically on gc.
MaybeLocal<Promise> FileHandle::ClosePromise() {
Isolate* isolate = env()->isolate();
EscapableHandleScope scope(isolate);
Local<Context> context = env()->context();
auto maybe_resolver = Promise::Resolver::New(context);
CHECK(!maybe_resolver.IsEmpty());
Local<Promise::Resolver> resolver = maybe_resolver.ToLocalChecked();
Local<Promise> promise = resolver.As<Promise>();
CHECK(!reading_);
if (!closed_ && !closing_) {
closing_ = true;
Local<Object> close_req_obj;
if (!env()
->fdclose_constructor_template()
->NewInstance(env()->context())
.ToLocal(&close_req_obj)) {
return MaybeLocal<Promise>();
}
CloseReq* req = new CloseReq(env(), close_req_obj, promise, object());
auto AfterClose = uv_fs_callback_t{[](uv_fs_t* req) {
std::unique_ptr<CloseReq> close(CloseReq::from_req(req));
CHECK_NOT_NULL(close);
close->file_handle()->AfterClose();
Isolate* isolate = close->env()->isolate();
if (req->result < 0) {
HandleScope handle_scope(isolate);
close->Reject(UVException(isolate, req->result, "close"));
} else {
close->Resolve();
}
}};
int ret = req->Dispatch(uv_fs_close, fd_, AfterClose);
if (ret < 0) {
req->Reject(UVException(isolate, ret, "close"));
delete req;
}
} else {
// Already closed. Just reject the promise immediately
resolver->Reject(context, UVException(isolate, UV_EBADF, "close"))
.Check();
}
return scope.Escape(promise);
}
void FileHandle::Close(const FunctionCallbackInfo<Value>& args) {
FileHandle* fd;
ASSIGN_OR_RETURN_UNWRAP(&fd, args.Holder());
Local<Promise> ret;
if (!fd->ClosePromise().ToLocal(&ret)) return;
args.GetReturnValue().Set(ret);
}
void FileHandle::ReleaseFD(const FunctionCallbackInfo<Value>& args) {
FileHandle* fd;
ASSIGN_OR_RETURN_UNWRAP(&fd, args.Holder());
// Just act as if this FileHandle has been closed.
fd->AfterClose();
}
void FileHandle::AfterClose() {
closing_ = false;
closed_ = true;
fd_ = -1;
if (reading_ && !persistent().IsEmpty())
EmitRead(UV_EOF);
}
void FileHandleReadWrap::MemoryInfo(MemoryTracker* tracker) const {
tracker->TrackField("buffer", buffer_);
tracker->TrackField("file_handle", this->file_handle_);
}
FileHandleReadWrap::FileHandleReadWrap(FileHandle* handle, Local<Object> obj)
: ReqWrap(handle->env(), obj, AsyncWrap::PROVIDER_FSREQCALLBACK),
file_handle_(handle) {}
int FileHandle::ReadStart() {
if (!IsAlive() || IsClosing())
return UV_EOF;
reading_ = true;
if (current_read_)
return 0;
std::unique_ptr<FileHandleReadWrap> read_wrap;
if (read_length_ == 0) {
EmitRead(UV_EOF);
return 0;
}
{
// Create a new FileHandleReadWrap or re-use one.
// Either way, we need these two scopes for AsyncReset() or otherwise
// for creating the new instance.
HandleScope handle_scope(env()->isolate());
AsyncHooks::DefaultTriggerAsyncIdScope trigger_scope(this);
auto& freelist = env()->file_handle_read_wrap_freelist();
if (freelist.size() > 0) {
read_wrap = std::move(freelist.back());
freelist.pop_back();
read_wrap->AsyncReset();
read_wrap->file_handle_ = this;
} else {
Local<Object> wrap_obj;
if (!env()
->filehandlereadwrap_template()
->NewInstance(env()->context())
.ToLocal(&wrap_obj)) {
return UV_EBUSY;
}
read_wrap = std::make_unique<FileHandleReadWrap>(this, wrap_obj);
}
}
int64_t recommended_read = 65536;
if (read_length_ >= 0 && read_length_ <= recommended_read)
recommended_read = read_length_;
read_wrap->buffer_ = EmitAlloc(recommended_read);
current_read_ = std::move(read_wrap);
current_read_->Dispatch(uv_fs_read,
fd_,
¤t_read_->buffer_,
1,
read_offset_,
uv_fs_callback_t{[](uv_fs_t* req) {
FileHandle* handle;
{
FileHandleReadWrap* req_wrap = FileHandleReadWrap::from_req(req);
handle = req_wrap->file_handle_;
CHECK_EQ(handle->current_read_.get(), req_wrap);
}
// ReadStart() checks whether current_read_ is set to determine whether
// a read is in progress. Moving it into a local variable makes sure that
// the ReadStart() call below doesn't think we're still actively reading.
std::unique_ptr<FileHandleReadWrap> read_wrap =
std::move(handle->current_read_);
int result = req->result;
uv_buf_t buffer = read_wrap->buffer_;
uv_fs_req_cleanup(req);
// Push the read wrap back to the freelist, or let it be destroyed
// once we’re exiting the current scope.
constexpr size_t wanted_freelist_fill = 100;
auto& freelist = handle->env()->file_handle_read_wrap_freelist();
if (freelist.size() < wanted_freelist_fill) {
read_wrap->Reset();
freelist.emplace_back(std::move(read_wrap));
}
if (result >= 0) {
// Read at most as many bytes as we originally planned to.
if (handle->read_length_ >= 0 && handle->read_length_ < result)
result = handle->read_length_;
// If we read data and we have an expected length, decrease it by
// how much we have read.
if (handle->read_length_ >= 0)
handle->read_length_ -= result;
// If we have an offset, increase it by how much we have read.
if (handle->read_offset_ >= 0)
handle->read_offset_ += result;
}
// Reading 0 bytes from a file always means EOF, or that we reached
// the end of the requested range.
if (result == 0)
result = UV_EOF;
handle->EmitRead(result, buffer);
// Start over, if EmitRead() didn’t tell us to stop.
if (handle->reading_)
handle->ReadStart();
}});
return 0;
}
int FileHandle::ReadStop() {
reading_ = false;
return 0;
}
typedef SimpleShutdownWrap<ReqWrap<uv_fs_t>> FileHandleCloseWrap;
ShutdownWrap* FileHandle::CreateShutdownWrap(Local<Object> object) {
return new FileHandleCloseWrap(this, object);
}
int FileHandle::DoShutdown(ShutdownWrap* req_wrap) {
FileHandleCloseWrap* wrap = static_cast<FileHandleCloseWrap*>(req_wrap);
closing_ = true;
wrap->Dispatch(uv_fs_close, fd_, uv_fs_callback_t{[](uv_fs_t* req) {
FileHandleCloseWrap* wrap = static_cast<FileHandleCloseWrap*>(
FileHandleCloseWrap::from_req(req));
FileHandle* handle = static_cast<FileHandle*>(wrap->stream());
handle->AfterClose();
int result = req->result;
uv_fs_req_cleanup(req);
wrap->Done(result);
}});
return 0;
}
void FSReqCallback::Reject(Local<Value> reject) {
MakeCallback(env()->oncomplete_string(), 1, &reject);
}
void FSReqCallback::ResolveStat(const uv_stat_t* stat) {
Resolve(FillGlobalStatsArray(env(), use_bigint(), stat));
}
void FSReqCallback::Resolve(Local<Value> value) {
Local<Value> argv[2] {
Null(env()->isolate()),
value
};
MakeCallback(env()->oncomplete_string(),
value->IsUndefined() ? 1 : arraysize(argv),
argv);
}
void FSReqCallback::SetReturnValue(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().SetUndefined();
}
void NewFSReqCallback(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
Environment* env = Environment::GetCurrent(args);
new FSReqCallback(env, args.This(), args[0]->IsTrue());
}
FSReqAfterScope::FSReqAfterScope(FSReqBase* wrap, uv_fs_t* req)
: wrap_(wrap),
req_(req),
handle_scope_(wrap->env()->isolate()),
context_scope_(wrap->env()->context()) {
CHECK_EQ(wrap_->req(), req);
}
FSReqAfterScope::~FSReqAfterScope() {
uv_fs_req_cleanup(wrap_->req());
delete wrap_;
}
// TODO(joyeecheung): create a normal context object, and
// construct the actual errors in the JS land using the context.
// The context should include fds for some fs APIs, currently they are
// missing in the error messages. The path, dest, syscall, fd, .etc
// can be put into the context before the binding is even invoked,
// the only information that has to come from the C++ layer is the
// error number (and possibly the syscall for abstraction),
// which is also why the errors should have been constructed
// in JS for more flexibility.
void FSReqAfterScope::Reject(uv_fs_t* req) {
wrap_->Reject(UVException(wrap_->env()->isolate(),
req->result,
wrap_->syscall(),
nullptr,
req->path,
wrap_->data()));
}
bool FSReqAfterScope::Proceed() {
if (req_->result < 0) {
Reject(req_);
return false;
}
return true;
}
void AfterNoArgs(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
if (after.Proceed())
req_wrap->Resolve(Undefined(req_wrap->env()->isolate()));
}
void AfterStat(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
if (after.Proceed()) {
req_wrap->ResolveStat(&req->statbuf);
}
}
void AfterInteger(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
if (after.Proceed())
req_wrap->Resolve(Integer::New(req_wrap->env()->isolate(), req->result));
}
void AfterOpenFileHandle(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
if (after.Proceed()) {
FileHandle* fd = FileHandle::New(req_wrap->env(), req->result);
if (fd == nullptr) return;
req_wrap->Resolve(fd->object());
}
}
void AfterStringPath(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
MaybeLocal<Value> link;
Local<Value> error;
if (after.Proceed()) {
link = StringBytes::Encode(req_wrap->env()->isolate(),
req->path,
req_wrap->encoding(),
&error);
if (link.IsEmpty())
req_wrap->Reject(error);
else
req_wrap->Resolve(link.ToLocalChecked());
}
}
void AfterStringPtr(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
MaybeLocal<Value> link;
Local<Value> error;
if (after.Proceed()) {
link = StringBytes::Encode(req_wrap->env()->isolate(),
static_cast<const char*>(req->ptr),
req_wrap->encoding(),
&error);
if (link.IsEmpty())
req_wrap->Reject(error);
else
req_wrap->Resolve(link.ToLocalChecked());
}
}
void AfterScanDir(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
if (!after.Proceed()) {
return;
}
Environment* env = req_wrap->env();
Local<Value> error;
int r;
std::vector<Local<Value>> name_v;
for (int i = 0; ; i++) {
uv_dirent_t ent;
r = uv_fs_scandir_next(req, &ent);
if (r == UV_EOF)
break;
if (r != 0) {
return req_wrap->Reject(UVException(
env->isolate(), r, nullptr, req_wrap->syscall(), req->path));
}
MaybeLocal<Value> filename =
StringBytes::Encode(env->isolate(),
ent.name,
req_wrap->encoding(),
&error);
if (filename.IsEmpty())
return req_wrap->Reject(error);
name_v.push_back(filename.ToLocalChecked());
}
req_wrap->Resolve(Array::New(env->isolate(), name_v.data(), name_v.size()));
}
void AfterScanDirWithTypes(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
if (!after.Proceed()) {
return;
}
Environment* env = req_wrap->env();
Isolate* isolate = env->isolate();
Local<Value> error;
int r;
std::vector<Local<Value>> name_v;
std::vector<Local<Value>> type_v;
for (int i = 0; ; i++) {
uv_dirent_t ent;
r = uv_fs_scandir_next(req, &ent);
if (r == UV_EOF)
break;
if (r != 0) {
return req_wrap->Reject(
UVException(isolate, r, nullptr, req_wrap->syscall(), req->path));
}
MaybeLocal<Value> filename =
StringBytes::Encode(isolate,
ent.name,
req_wrap->encoding(),
&error);
if (filename.IsEmpty())
return req_wrap->Reject(error);
name_v.push_back(filename.ToLocalChecked());
type_v.emplace_back(Integer::New(isolate, ent.type));
}
Local<Array> result = Array::New(isolate, 2);
result->Set(env->context(),
0,
Array::New(isolate, name_v.data(),
name_v.size())).Check();
result->Set(env->context(),
1,
Array::New(isolate, type_v.data(),
type_v.size())).Check();
req_wrap->Resolve(result);
}
void Access(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
HandleScope scope(isolate);
const int argc = args.Length();
CHECK_GE(argc, 2);
CHECK(args[1]->IsInt32());
int mode = args[1].As<Int32>()->Value();
BufferValue path(isolate, args[0]);
CHECK_NOT_NULL(*path);
FSReqBase* req_wrap_async = GetReqWrap(env, args[2]);
if (req_wrap_async != nullptr) { // access(path, mode, req)
AsyncCall(env, req_wrap_async, args, "access", UTF8, AfterNoArgs,
uv_fs_access, *path, mode);
} else { // access(path, mode, undefined, ctx)
CHECK_EQ(argc, 4);
FSReqWrapSync req_wrap_sync;
FS_SYNC_TRACE_BEGIN(access);
SyncCall(env, args[3], &req_wrap_sync, "access", uv_fs_access, *path, mode);
FS_SYNC_TRACE_END(access);
}
}
void Close(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
const int argc = args.Length();
CHECK_GE(argc, 2);
CHECK(args[0]->IsInt32());
int fd = args[0].As<Int32>()->Value();
FSReqBase* req_wrap_async = GetReqWrap(env, args[1]);
if (req_wrap_async != nullptr) { // close(fd, req)
AsyncCall(env, req_wrap_async, args, "close", UTF8, AfterNoArgs,
uv_fs_close, fd);
} else { // close(fd, undefined, ctx)
CHECK_EQ(argc, 3);
FSReqWrapSync req_wrap_sync;
FS_SYNC_TRACE_BEGIN(close);
SyncCall(env, args[2], &req_wrap_sync, "close", uv_fs_close, fd);
FS_SYNC_TRACE_END(close);
}
}
// Used to speed up module loading. Returns the contents of the file as
// a string or undefined when the file cannot be opened or "main" is not found
// in the file.
static void InternalModuleReadJSON(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
uv_loop_t* loop = env->event_loop();
CHECK(args[0]->IsString());
node::Utf8Value path(isolate, args[0]);
if (strlen(*path) != path.length())
return; // Contains a nul byte.
uv_fs_t open_req;
const int fd = uv_fs_open(loop, &open_req, *path, O_RDONLY, 0, nullptr);
uv_fs_req_cleanup(&open_req);
if (fd < 0) {
return;
}
std::shared_ptr<void> defer_close(nullptr, [fd, loop] (...) {
uv_fs_t close_req;
CHECK_EQ(0, uv_fs_close(loop, &close_req, fd, nullptr));
uv_fs_req_cleanup(&close_req);
});
const size_t kBlockSize = 32 << 10;
std::vector<char> chars;
int64_t offset = 0;
ssize_t numchars;
do {
const size_t start = chars.size();
chars.resize(start + kBlockSize);
uv_buf_t buf;
buf.base = &chars[start];
buf.len = kBlockSize;
uv_fs_t read_req;
numchars = uv_fs_read(loop, &read_req, fd, &buf, 1, offset, nullptr);
uv_fs_req_cleanup(&read_req);
if (numchars < 0)
return;
offset += numchars;
} while (static_cast<size_t>(numchars) == kBlockSize);
size_t start = 0;
if (offset >= 3 && 0 == memcmp(&chars[0], "\xEF\xBB\xBF", 3)) {
start = 3; // Skip UTF-8 BOM.
}
const size_t size = offset - start;
char* p = &chars[start];
char* pe = &chars[size];
char* pos[2];
char** ppos = &pos[0];
while (p < pe) {
char c = *p++;
if (c == '"') goto quote; // Keeps code flat and inner loop small.
if (c == '\\' && p < pe && *p == '"') p++;
continue;
quote:
*ppos++ = p;
if (ppos < &pos[2]) continue;
ppos = &pos[0];
char* s = &pos[0][0];
char* se = &pos[1][-1]; // Exclude quote.
size_t n = se - s;
if (n == 4) {
if (0 == memcmp(s, "main", 4)) break;
if (0 == memcmp(s, "name", 4)) break;
if (0 == memcmp(s, "type", 4)) break;
} else if (n == 7) {
if (0 == memcmp(s, "exports", 7)) break;
}
}
Local<String> return_value;
if (p < pe) {
return_value =
String::NewFromUtf8(isolate,
&chars[start],
v8::NewStringType::kNormal,
size).ToLocalChecked();
} else {
return_value = env->empty_object_string();
}
args.GetReturnValue().Set(return_value);
}
// Used to speed up module loading. Returns 0 if the path refers to
// a file, 1 when it's a directory or < 0 on error (usually -ENOENT.)
// The speedup comes from not creating thousands of Stat and Error objects.
static void InternalModuleStat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args[0]->IsString());
node::Utf8Value path(env->isolate(), args[0]);
uv_fs_t req;
int rc = uv_fs_stat(env->event_loop(), &req, *path, nullptr);
if (rc == 0) {
const uv_stat_t* const s = static_cast<const uv_stat_t*>(req.ptr);
rc = !!(s->st_mode & S_IFDIR);
}
uv_fs_req_cleanup(&req);
args.GetReturnValue().Set(rc);
}
static void Stat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
const int argc = args.Length();
CHECK_GE(argc, 2);
BufferValue path(env->isolate(), args[0]);
CHECK_NOT_NULL(*path);
bool use_bigint = args[1]->IsTrue();
FSReqBase* req_wrap_async = GetReqWrap(env, args[2], use_bigint);
if (req_wrap_async != nullptr) { // stat(path, use_bigint, req)
AsyncCall(env, req_wrap_async, args, "stat", UTF8, AfterStat,
uv_fs_stat, *path);
} else { // stat(path, use_bigint, undefined, ctx)
CHECK_EQ(argc, 4);
FSReqWrapSync req_wrap_sync;
FS_SYNC_TRACE_BEGIN(stat);
int err = SyncCall(env, args[3], &req_wrap_sync, "stat", uv_fs_stat, *path);
FS_SYNC_TRACE_END(stat);
if (err != 0) {
return; // error info is in ctx
}
Local<Value> arr = FillGlobalStatsArray(env, use_bigint,
static_cast<const uv_stat_t*>(req_wrap_sync.req.ptr));
args.GetReturnValue().Set(arr);
}
}
static void LStat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
const int argc = args.Length();
CHECK_GE(argc, 3);
BufferValue path(env->isolate(), args[0]);
CHECK_NOT_NULL(*path);
bool use_bigint = args[1]->IsTrue();
FSReqBase* req_wrap_async = GetReqWrap(env, args[2], use_bigint);
if (req_wrap_async != nullptr) { // lstat(path, use_bigint, req)
AsyncCall(env, req_wrap_async, args, "lstat", UTF8, AfterStat,
uv_fs_lstat, *path);
} else { // lstat(path, use_bigint, undefined, ctx)
CHECK_EQ(argc, 4);
FSReqWrapSync req_wrap_sync;
FS_SYNC_TRACE_BEGIN(lstat);
int err = SyncCall(env, args[3], &req_wrap_sync, "lstat", uv_fs_lstat,
*path);
FS_SYNC_TRACE_END(lstat);
if (err != 0) {
return; // error info is in ctx
}
Local<Value> arr = FillGlobalStatsArray(env, use_bigint,
static_cast<const uv_stat_t*>(req_wrap_sync.req.ptr));
args.GetReturnValue().Set(arr);
}
}
static void FStat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
const int argc = args.Length();
CHECK_GE(argc, 2);
CHECK(args[0]->IsInt32());
int fd = args[0].As<Int32>()->Value();
bool use_bigint = args[1]->IsTrue();
FSReqBase* req_wrap_async = GetReqWrap(env, args[2], use_bigint);
if (req_wrap_async != nullptr) { // fstat(fd, use_bigint, req)
AsyncCall(env, req_wrap_async, args, "fstat", UTF8, AfterStat,
uv_fs_fstat, fd);
} else { // fstat(fd, use_bigint, undefined, ctx)
CHECK_EQ(argc, 4);
FSReqWrapSync req_wrap_sync;
FS_SYNC_TRACE_BEGIN(fstat);
int err = SyncCall(env, args[3], &req_wrap_sync, "fstat", uv_fs_fstat, fd);
FS_SYNC_TRACE_END(fstat);
if (err != 0) {
return; // error info is in ctx
}
Local<Value> arr = FillGlobalStatsArray(env, use_bigint,
static_cast<const uv_stat_t*>(req_wrap_sync.req.ptr));
args.GetReturnValue().Set(arr);
}
}
static void Symlink(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
int argc = args.Length();
CHECK_GE(argc, 4);
BufferValue target(isolate, args[0]);
CHECK_NOT_NULL(*target);
BufferValue path(isolate, args[1]);
CHECK_NOT_NULL(*path);
CHECK(args[2]->IsInt32());
int flags = args[2].As<Int32>()->Value();
FSReqBase* req_wrap_async = GetReqWrap(env, args[3]);
if (req_wrap_async != nullptr) { // symlink(target, path, flags, req)
AsyncDestCall(env, req_wrap_async, args, "symlink", *path, path.length(),
UTF8, AfterNoArgs, uv_fs_symlink, *target, *path, flags);
} else { // symlink(target, path, flags, undefinec, ctx)
CHECK_EQ(argc, 5);
FSReqWrapSync req_wrap_sync;
FS_SYNC_TRACE_BEGIN(symlink);
SyncCall(env, args[4], &req_wrap_sync, "symlink",
uv_fs_symlink, *target, *path, flags);
FS_SYNC_TRACE_END(symlink);