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node_file.cc
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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 "ada.h"
#include "aliased_buffer-inl.h"
#include "memory_tracker-inl.h"
#include "node_buffer.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "node_file-inl.h"
#include "node_metadata.h"
#include "node_process-inl.h"
#include "node_stat_watcher.h"
#include "node_url.h"
#include "path.h"
#include "permission/permission.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 "uv.h"
#include "v8-fast-api-calls.h"
#include <filesystem>
#if defined(__MINGW32__) || defined(_MSC_VER)
# include <io.h>
#endif
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#endif
namespace node {
namespace fs {
using v8::Array;
using v8::BigInt;
using v8::Context;
using v8::EscapableHandleScope;
using v8::FastApiCallbackOptions;
using v8::FastOneByteString;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Int32;
using v8::Integer;
using v8::Isolate;
using v8::JustVoid;
using v8::Local;
using v8::LocalVector;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Nothing;
using v8::Number;
using v8::Object;
using v8::ObjectTemplate;
using v8::Promise;
using v8::String;
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;
}
static const char* get_fs_func_name_by_type(uv_fs_type req_type) {
switch (req_type) {
#define FS_TYPE_TO_NAME(type, name) \
case UV_FS_##type: \
return name;
FS_TYPE_TO_NAME(OPEN, "open")
FS_TYPE_TO_NAME(CLOSE, "close")
FS_TYPE_TO_NAME(READ, "read")
FS_TYPE_TO_NAME(WRITE, "write")
FS_TYPE_TO_NAME(SENDFILE, "sendfile")
FS_TYPE_TO_NAME(STAT, "stat")
FS_TYPE_TO_NAME(LSTAT, "lstat")
FS_TYPE_TO_NAME(FSTAT, "fstat")
FS_TYPE_TO_NAME(FTRUNCATE, "ftruncate")
FS_TYPE_TO_NAME(UTIME, "utime")
FS_TYPE_TO_NAME(FUTIME, "futime")
FS_TYPE_TO_NAME(ACCESS, "access")
FS_TYPE_TO_NAME(CHMOD, "chmod")
FS_TYPE_TO_NAME(FCHMOD, "fchmod")
FS_TYPE_TO_NAME(FSYNC, "fsync")
FS_TYPE_TO_NAME(FDATASYNC, "fdatasync")
FS_TYPE_TO_NAME(UNLINK, "unlink")
FS_TYPE_TO_NAME(RMDIR, "rmdir")
FS_TYPE_TO_NAME(MKDIR, "mkdir")
FS_TYPE_TO_NAME(MKDTEMP, "mkdtemp")
FS_TYPE_TO_NAME(RENAME, "rename")
FS_TYPE_TO_NAME(SCANDIR, "scandir")
FS_TYPE_TO_NAME(LINK, "link")
FS_TYPE_TO_NAME(SYMLINK, "symlink")
FS_TYPE_TO_NAME(READLINK, "readlink")
FS_TYPE_TO_NAME(CHOWN, "chown")
FS_TYPE_TO_NAME(FCHOWN, "fchown")
FS_TYPE_TO_NAME(REALPATH, "realpath")
FS_TYPE_TO_NAME(COPYFILE, "copyfile")
FS_TYPE_TO_NAME(LCHOWN, "lchown")
FS_TYPE_TO_NAME(STATFS, "statfs")
FS_TYPE_TO_NAME(MKSTEMP, "mkstemp")
FS_TYPE_TO_NAME(LUTIME, "lutime")
#undef FS_TYPE_TO_NAME
default:
return "unknown";
}
}
#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__);
#define FS_ASYNC_TRACE_BEGIN0(fs_type, id) \
TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(TRACING_CATEGORY_NODE2(fs, async), \
get_fs_func_name_by_type(fs_type), \
id);
#define FS_ASYNC_TRACE_END0(fs_type, id) \
TRACE_EVENT_NESTABLE_ASYNC_END0(TRACING_CATEGORY_NODE2(fs, async), \
get_fs_func_name_by_type(fs_type), \
id);
#define FS_ASYNC_TRACE_BEGIN1(fs_type, id, name, value) \
TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(TRACING_CATEGORY_NODE2(fs, async), \
get_fs_func_name_by_type(fs_type), \
id, \
name, \
value);
#define FS_ASYNC_TRACE_END1(fs_type, id, name, value) \
TRACE_EVENT_NESTABLE_ASYNC_END1(TRACING_CATEGORY_NODE2(fs, async), \
get_fs_func_name_by_type(fs_type), \
id, \
name, \
value);
#define FS_ASYNC_TRACE_BEGIN2(fs_type, id, name1, value1, name2, value2) \
TRACE_EVENT_NESTABLE_ASYNC_BEGIN2(TRACING_CATEGORY_NODE2(fs, async), \
get_fs_func_name_by_type(fs_type), \
id, \
name1, \
value1, \
name2, \
value2);
#define FS_ASYNC_TRACE_END2(fs_type, id, name1, value1, name2, value2) \
TRACE_EVENT_NESTABLE_ASYNC_END2(TRACING_CATEGORY_NODE2(fs, async), \
get_fs_func_name_by_type(fs_type), \
id, \
name1, \
value1, \
name2, \
value2);
// 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() = default;
FSReqBase::~FSReqBase() = default;
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(BindingData* binding_data,
Local<Object> obj, int fd)
: AsyncWrap(binding_data->env(), obj, AsyncWrap::PROVIDER_FILEHANDLE),
StreamBase(env()),
fd_(fd),
binding_data_(binding_data) {
MakeWeak();
StreamBase::AttachToObject(GetObject());
}
FileHandle* FileHandle::New(BindingData* binding_data,
int fd,
Local<Object> obj,
std::optional<int64_t> maybeOffset,
std::optional<int64_t> maybeLength) {
Environment* env = binding_data->env();
if (obj.IsEmpty() && !env->fd_constructor_template()
->NewInstance(env->context())
.ToLocal(&obj)) {
return nullptr;
}
auto handle = new FileHandle(binding_data, obj, fd);
if (maybeOffset.has_value()) handle->read_offset_ = maybeOffset.value();
if (maybeLength.has_value()) handle->read_length_ = maybeLength.value();
return handle;
}
void FileHandle::New(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
CHECK(args[0]->IsInt32());
Realm* realm = Realm::GetCurrent(args);
BindingData* binding_data = realm->GetBindingData<BindingData>();
std::optional<int64_t> maybeOffset = std::nullopt;
std::optional<int64_t> maybeLength = std::nullopt;
if (args[1]->IsNumber())
maybeOffset = args[1]->IntegerValue(realm->context()).FromJust();
if (args[2]->IsNumber())
maybeLength = args[2]->IntegerValue(realm->context()).FromJust();
FileHandle::New(binding_data,
args[0].As<Int32>()->Value(),
args.This(),
maybeOffset,
maybeLength);
}
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_);
}
BaseObject::TransferMode FileHandle::GetTransferMode() const {
return reading_ || closing_ || closed_
? TransferMode::kDisallowCloneAndTransfer
: TransferMode::kTransferable;
}
std::unique_ptr<worker::TransferData> FileHandle::TransferForMessaging() {
CHECK_NE(GetTransferMode(), TransferMode::kDisallowCloneAndTransfer);
auto ret = std::make_unique<TransferData>(fd_);
closed_ = true;
return ret;
}
FileHandle::TransferData::TransferData(int fd) : fd_(fd) {}
FileHandle::TransferData::~TransferData() {
if (fd_ > 0) {
uv_fs_t close_req;
CHECK_NE(fd_, -1);
FS_SYNC_TRACE_BEGIN(close);
CHECK_EQ(0, uv_fs_close(nullptr, &close_req, fd_, nullptr));
FS_SYNC_TRACE_END(close);
uv_fs_req_cleanup(&close_req);
}
}
BaseObjectPtr<BaseObject> FileHandle::TransferData::Deserialize(
Environment* env,
v8::Local<v8::Context> context,
std::unique_ptr<worker::TransferData> self) {
BindingData* bd = Realm::GetBindingData<BindingData>(context);
if (bd == nullptr) return {};
int fd = fd_;
fd_ = -1;
return BaseObjectPtr<BaseObject> { FileHandle::New(bd, fd) };
}
// 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_ || closing_) return;
uv_fs_t req;
CHECK_NE(fd_, -1);
FS_SYNC_TRACE_BEGIN(close);
int ret = uv_fs_close(env()->event_loop(), &req, fd_, nullptr);
FS_SYNC_TRACE_END(close);
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()->SetImmediate([detail](Environment* env) {
ProcessEmitWarning(env,
"Closing file descriptor %d on garbage collection",
detail.fd);
if (env->filehandle_close_warning()) {
env->set_filehandle_close_warning(false);
USE(ProcessEmitDeprecationWarning(
env,
"Closing a FileHandle object on garbage collection is deprecated. "
"Please close FileHandle objects explicitly using "
"FileHandle.prototype.close(). In the future, an error will be "
"thrown if a file descriptor is closed during garbage collection.",
"DEP0137"));
}
}, CallbackFlags::kUnrefed);
}
void FileHandle::CloseReq::Resolve() {
Isolate* isolate = env()->isolate();
HandleScope scope(isolate);
Context::Scope context_scope(env()->context());
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);
Context::Scope context_scope(env()->context());
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();
Local<Value> close_resolver =
object()->GetInternalField(FileHandle::kClosingPromiseSlot).As<Value>();
if (close_resolver->IsPromise()) {
return close_resolver.As<Promise>();
}
CHECK(!closed_);
CHECK(!closing_);
CHECK(!reading_);
auto maybe_resolver = Promise::Resolver::New(context);
CHECK(!maybe_resolver.IsEmpty());
Local<Promise::Resolver> resolver;
if (!maybe_resolver.ToLocal(&resolver)) return {};
Local<Promise> promise = resolver.As<Promise>();
Local<Object> close_req_obj;
if (!env()->fdclose_constructor_template()
->NewInstance(env()->context()).ToLocal(&close_req_obj)) {
return MaybeLocal<Promise>();
}
closing_ = true;
object()->SetInternalField(FileHandle::kClosingPromiseSlot, promise);
CloseReq* req = new CloseReq(env(), close_req_obj, promise, object());
auto AfterClose = uv_fs_callback_t{[](uv_fs_t* req) {
CloseReq* req_wrap = CloseReq::from_req(req);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
BaseObjectPtr<CloseReq> close(req_wrap);
CHECK(close);
close->file_handle()->AfterClose();
if (!close->env()->can_call_into_js()) return;
Isolate* isolate = close->env()->isolate();
if (req->result < 0) {
HandleScope handle_scope(isolate);
close->Reject(
UVException(isolate, static_cast<int>(req->result), "close"));
} else {
close->Resolve();
}
}};
CHECK_NE(fd_, -1);
FS_ASYNC_TRACE_BEGIN0(UV_FS_CLOSE, req)
int ret = req->Dispatch(uv_fs_close, fd_, AfterClose);
if (ret < 0) {
req->Reject(UVException(isolate, ret, "close"));
delete req;
}
return scope.Escape(promise);
}
void FileHandle::Close(const FunctionCallbackInfo<Value>& args) {
FileHandle* fd;
ASSIGN_OR_RETURN_UNWRAP(&fd, args.This());
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.This());
fd->Release();
}
int FileHandle::Release() {
int fd = GetFD();
// Just pretend that Close was called and we're all done.
AfterClose();
return fd;
}
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;
BaseObjectPtr<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 = binding_data_->file_handle_read_wrap_freelist;
if (freelist.size() > 0) {
read_wrap = std::move(freelist.back());
freelist.pop_back();
// Use a fresh async resource.
// Lifetime is ensured via AsyncWrap::resource_.
Local<Object> resource = Object::New(env()->isolate());
USE(resource->Set(
env()->context(), env()->handle_string(), read_wrap->object()));
read_wrap->AsyncReset(resource);
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 = MakeDetachedBaseObject<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);
FS_ASYNC_TRACE_BEGIN0(UV_FS_READ, current_read_.get())
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);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
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.
BaseObjectPtr<FileHandleReadWrap> read_wrap =
std::move(handle->current_read_);
ssize_t 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 kWantedFreelistFill = 100;
auto& freelist = handle->binding_data_->file_handle_read_wrap_freelist;
if (freelist.size() < kWantedFreelistFill) {
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) {
if (closing_ || closed_) {
req_wrap->Done(0);
return 1;
}
FileHandleCloseWrap* wrap = static_cast<FileHandleCloseWrap*>(req_wrap);
closing_ = true;
CHECK_NE(fd_, -1);
FS_ASYNC_TRACE_BEGIN0(UV_FS_CLOSE, wrap)
wrap->Dispatch(uv_fs_close, fd_, uv_fs_callback_t{[](uv_fs_t* req) {
FileHandleCloseWrap* wrap = static_cast<FileHandleCloseWrap*>(
FileHandleCloseWrap::from_req(req));
FS_ASYNC_TRACE_END1(
req->fs_type, wrap, "result", static_cast<int>(req->result))
FileHandle* handle = static_cast<FileHandle*>(wrap->stream());
handle->AfterClose();
int result = static_cast<int>(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(binding_data(), use_bigint(), stat));
}
void FSReqCallback::ResolveStatFs(const uv_statfs_t* stat) {
Resolve(FillGlobalStatFsArray(binding_data(), 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());
BindingData* binding_data = Realm::GetBindingData<BindingData>(args);
new FSReqCallback(binding_data, 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() {
Clear();
}
void FSReqAfterScope::Clear() {
if (!wrap_) return;
uv_fs_req_cleanup(wrap_->req());
wrap_->Detach();
wrap_.reset();
}
// 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) {
BaseObjectPtr<FSReqBase> wrap { wrap_ };
Local<Value> exception = UVException(wrap_->env()->isolate(),
static_cast<int>(req->result),
wrap_->syscall(),
nullptr,
req->path,
wrap_->data());
Clear();
wrap->Reject(exception);
}
bool FSReqAfterScope::Proceed() {
if (!wrap_->env()->can_call_into_js()) {
return false;
}
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);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
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);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
if (after.Proceed()) {
req_wrap->ResolveStat(&req->statbuf);
}
}
void AfterStatFs(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
if (after.Proceed()) {
req_wrap->ResolveStatFs(static_cast<uv_statfs_t*>(req->ptr));
}
}
void AfterInteger(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
int result = static_cast<int>(req->result);
if (result >= 0 && req_wrap->is_plain_open())
req_wrap->env()->AddUnmanagedFd(result);
if (after.Proceed())
req_wrap->Resolve(Integer::New(req_wrap->env()->isolate(), result));
}
void AfterOpenFileHandle(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
if (after.Proceed()) {
FileHandle* fd = FileHandle::New(req_wrap->binding_data(),
static_cast<int>(req->result));
if (fd == nullptr) return;
req_wrap->Resolve(fd->object());
}
}
void AfterMkdirp(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
if (after.Proceed()) {
std::string first_path(req_wrap->continuation_data()->first_path());
if (first_path.empty())
return req_wrap->Resolve(Undefined(req_wrap->env()->isolate()));
Local<Value> path;
Local<Value> error;
if (!StringBytes::Encode(req_wrap->env()->isolate(), first_path.c_str(),
req_wrap->encoding(),
&error).ToLocal(&path)) {
return req_wrap->Reject(error);
}
return req_wrap->Resolve(path);
}
}
void AfterStringPath(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
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 {
Local<Value> val;
if (link.ToLocal(&val)) req_wrap->Resolve(val);
}
}
}
void AfterStringPtr(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
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 {
Local<Value> val;
if (link.ToLocal(&val)) req_wrap->Resolve(val);
}
}
}
void AfterScanDir(uv_fs_t* req) {
FSReqBase* req_wrap = FSReqBase::from_req(req);
FSReqAfterScope after(req_wrap, req);
FS_ASYNC_TRACE_END1(
req->fs_type, req_wrap, "result", static_cast<int>(req->result))
if (!after.Proceed()) {
return;
}
Environment* env = req_wrap->env();
Isolate* isolate = env->isolate();
Local<Value> error;
int r;
LocalVector<Value> name_v(isolate);
LocalVector<Value> type_v(isolate);
const bool with_file_types = req_wrap->with_file_types();
for (;;) {
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));
}
Local<Value> filename;
if (!StringBytes::Encode(isolate, ent.name, req_wrap->encoding(), &error)
.ToLocal(&filename)) {
return req_wrap->Reject(error);
}
name_v.push_back(filename);
if (with_file_types) type_v.emplace_back(Integer::New(isolate, ent.type));
}
if (with_file_types) {
Local<Value> result[] = {Array::New(isolate, name_v.data(), name_v.size()),
Array::New(isolate, type_v.data(), type_v.size())};
req_wrap->Resolve(Array::New(isolate, result, arraysize(result)));
} else {
req_wrap->Resolve(Array::New(isolate, name_v.data(), name_v.size()));
}
}
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); // path, mode
int mode;
if (!GetValidFileMode(env, args[1], UV_FS_ACCESS).To(&mode)) {
return;
}
BufferValue path(isolate, args[0]);
CHECK_NOT_NULL(*path);
ToNamespacedPath(env, &path);
if (argc > 2) { // access(path, mode, req)
FSReqBase* req_wrap_async = GetReqWrap(args, 2);
CHECK_NOT_NULL(req_wrap_async);
ASYNC_THROW_IF_INSUFFICIENT_PERMISSIONS(
env,
req_wrap_async,
permission::PermissionScope::kFileSystemRead,
path.ToStringView());
FS_ASYNC_TRACE_BEGIN1(
UV_FS_ACCESS, req_wrap_async, "path", TRACE_STR_COPY(*path))
AsyncCall(env, req_wrap_async, args, "access", UTF8, AfterNoArgs,
uv_fs_access, *path, mode);
} else { // access(path, mode)
THROW_IF_INSUFFICIENT_PERMISSIONS(
env, permission::PermissionScope::kFileSystemRead, path.ToStringView());
FSReqWrapSync req_wrap_sync("access", *path);
FS_SYNC_TRACE_BEGIN(access);
SyncCallAndThrowOnError(env, &req_wrap_sync, 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, 1);
int fd;
if (!GetValidatedFd(env, args[0]).To(&fd)) {
return;
}
env->RemoveUnmanagedFd(fd);
if (argc > 1) { // close(fd, req)
FSReqBase* req_wrap_async = GetReqWrap(args, 1);
CHECK_NOT_NULL(req_wrap_async);
FS_ASYNC_TRACE_BEGIN0(UV_FS_CLOSE, req_wrap_async)
AsyncCall(env, req_wrap_async, args, "close", UTF8, AfterNoArgs,
uv_fs_close, fd);
} else { // close(fd)
FSReqWrapSync req_wrap_sync("close");