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node/src/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.h"
#include "node_buffer.h"
#include "node_internals.h"
#include "node_stat_watcher.h"
#include "env.h"
#include "env-inl.h"
#include "req-wrap.h"
#include "req-wrap-inl.h"
#include "string_bytes.h"
#include "util.h"
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#if defined(__MINGW32__) || defined(_MSC_VER)
# include <io.h>
#endif
#include <vector>
namespace node {
namespace {
using v8::Array;
using v8::ArrayBuffer;
using v8::Context;
using v8::Float64Array;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Local;
using v8::MaybeLocal;
using v8::Number;
using v8::Object;
using v8::String;
using v8::Value;
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#define TYPE_ERROR(msg) env->ThrowTypeError(msg)
#define GET_OFFSET(a) ((a)->IsNumber() ? (a)->IntegerValue() : -1)
class FSReqWrap: public ReqWrap<uv_fs_t> {
public:
enum Ownership { COPY, MOVE };
inline static FSReqWrap* New(Environment* env,
Local<Object> req,
const char* syscall,
const char* data = nullptr,
enum encoding encoding = UTF8,
Ownership ownership = COPY);
inline void Dispose();
void ReleaseEarly() {
if (data_ != inline_data()) {
delete[] data_;
data_ = nullptr;
}
}
const char* syscall() const { return syscall_; }
const char* data() const { return data_; }
const enum encoding encoding_;
size_t self_size() const override { return sizeof(*this); }
private:
FSReqWrap(Environment* env,
Local<Object> req,
const char* syscall,
const char* data,
enum encoding encoding)
: ReqWrap(env, req, AsyncWrap::PROVIDER_FSREQWRAP),
encoding_(encoding),
syscall_(syscall),
data_(data) {
Wrap(object(), this);
}
~FSReqWrap() { ReleaseEarly(); }
void* operator new(size_t size) = delete;
void* operator new(size_t size, char* storage) { return storage; }
char* inline_data() { return reinterpret_cast<char*>(this + 1); }
const char* syscall_;
const char* data_;
DISALLOW_COPY_AND_ASSIGN(FSReqWrap);
};
#define ASSERT_PATH(path) \
if (*path == nullptr) \
return TYPE_ERROR( #path " must be a string or Buffer");
FSReqWrap* FSReqWrap::New(Environment* env,
Local<Object> req,
const char* syscall,
const char* data,
enum encoding encoding,
Ownership ownership) {
const bool copy = (data != nullptr && ownership == COPY);
const size_t size = copy ? 1 + strlen(data) : 0;
FSReqWrap* that;
char* const storage = new char[sizeof(*that) + size];
that = new(storage) FSReqWrap(env, req, syscall, data, encoding);
if (copy)
that->data_ = static_cast<char*>(memcpy(that->inline_data(), data, size));
return that;
}
void FSReqWrap::Dispose() {
this->~FSReqWrap();
delete[] reinterpret_cast<char*>(this);
}
void NewFSReqWrap(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
}
inline bool IsInt64(double x) {
return x == static_cast<double>(static_cast<int64_t>(x));
}
void After(uv_fs_t *req) {
FSReqWrap* req_wrap = static_cast<FSReqWrap*>(req->data);
CHECK_EQ(req_wrap->req(), req);
req_wrap->ReleaseEarly(); // Free memory that's no longer used now.
Environment* env = req_wrap->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
// there is always at least one argument. "error"
int argc = 1;
// Allocate space for two args. We may only use one depending on the case.
// (Feel free to increase this if you need more)
Local<Value> argv[2];
MaybeLocal<Value> link;
Local<Value> error;
if (req->result < 0) {
// An error happened.
argv[0] = UVException(env->isolate(),
req->result,
req_wrap->syscall(),
nullptr,
req->path,
req_wrap->data());
} else {
// error value is empty or null for non-error.
argv[0] = Null(env->isolate());
// All have at least two args now.
argc = 2;
switch (req->fs_type) {
// These all have no data to pass.
case UV_FS_ACCESS:
case UV_FS_CLOSE:
case UV_FS_RENAME:
case UV_FS_UNLINK:
case UV_FS_RMDIR:
case UV_FS_MKDIR:
case UV_FS_FTRUNCATE:
case UV_FS_FSYNC:
case UV_FS_FDATASYNC:
case UV_FS_LINK:
case UV_FS_SYMLINK:
case UV_FS_CHMOD:
case UV_FS_FCHMOD:
case UV_FS_CHOWN:
case UV_FS_FCHOWN:
// These, however, don't.
argc = 1;
break;
case UV_FS_STAT:
case UV_FS_LSTAT:
case UV_FS_FSTAT:
argc = 1;
FillStatsArray(env->fs_stats_field_array(),
static_cast<const uv_stat_t*>(req->ptr));
break;
case UV_FS_UTIME:
case UV_FS_FUTIME:
argc = 0;
break;
case UV_FS_OPEN:
argv[1] = Integer::New(env->isolate(), req->result);
break;
case UV_FS_WRITE:
argv[1] = Integer::New(env->isolate(), req->result);
break;
case UV_FS_MKDTEMP:
{
link = StringBytes::Encode(env->isolate(),
static_cast<const char*>(req->path),
req_wrap->encoding_,
&error);
if (link.IsEmpty()) {
// TODO(addaleax): Use `error` itself here.
argv[0] = UVException(env->isolate(),
UV_EINVAL,
req_wrap->syscall(),
"Invalid character encoding for filename",
req->path,
req_wrap->data());
} else {
argv[1] = link.ToLocalChecked();
}
break;
}
case UV_FS_READLINK:
link = StringBytes::Encode(env->isolate(),
static_cast<const char*>(req->ptr),
req_wrap->encoding_,
&error);
if (link.IsEmpty()) {
// TODO(addaleax): Use `error` itself here.
argv[0] = UVException(env->isolate(),
UV_EINVAL,
req_wrap->syscall(),
"Invalid character encoding for link",
req->path,
req_wrap->data());
} else {
argv[1] = link.ToLocalChecked();
}
break;
case UV_FS_REALPATH:
link = StringBytes::Encode(env->isolate(),
static_cast<const char*>(req->ptr),
req_wrap->encoding_,
&error);
if (link.IsEmpty()) {
// TODO(addaleax): Use `error` itself here.
argv[0] = UVException(env->isolate(),
UV_EINVAL,
req_wrap->syscall(),
"Invalid character encoding for link",
req->path,
req_wrap->data());
} else {
argv[1] = link.ToLocalChecked();
}
break;
case UV_FS_READ:
// Buffer interface
argv[1] = Integer::New(env->isolate(), req->result);
break;
case UV_FS_SCANDIR:
{
int r;
Local<Array> names = Array::New(env->isolate(), 0);
Local<Function> fn = env->push_values_to_array_function();
Local<Value> name_argv[NODE_PUSH_VAL_TO_ARRAY_MAX];
size_t name_idx = 0;
for (int i = 0; ; i++) {
uv_dirent_t ent;
r = uv_fs_scandir_next(req, &ent);
if (r == UV_EOF)
break;
if (r != 0) {
argv[0] = UVException(r,
nullptr,
req_wrap->syscall(),
static_cast<const char*>(req->path));
break;
}
MaybeLocal<Value> filename =
StringBytes::Encode(env->isolate(),
ent.name,
req_wrap->encoding_,
&error);
if (filename.IsEmpty()) {
// TODO(addaleax): Use `error` itself here.
argv[0] = UVException(env->isolate(),
UV_EINVAL,
req_wrap->syscall(),
"Invalid character encoding for filename",
req->path,
req_wrap->data());
break;
}
name_argv[name_idx++] = filename.ToLocalChecked();
if (name_idx >= arraysize(name_argv)) {
fn->Call(env->context(), names, name_idx, name_argv)
.ToLocalChecked();
name_idx = 0;
}
}
if (name_idx > 0) {
fn->Call(env->context(), names, name_idx, name_argv)
.ToLocalChecked();
}
argv[1] = names;
}
break;
default:
CHECK(0 && "Unhandled eio response");
}
}
req_wrap->MakeCallback(env->oncomplete_string(), argc, argv);
uv_fs_req_cleanup(req_wrap->req());
req_wrap->Dispose();
}
// This struct is only used on sync fs calls.
// For async calls FSReqWrap is used.
class fs_req_wrap {
public:
fs_req_wrap() {}
~fs_req_wrap() { uv_fs_req_cleanup(&req); }
uv_fs_t req;
private:
DISALLOW_COPY_AND_ASSIGN(fs_req_wrap);
};
#define ASYNC_DEST_CALL(func, request, dest, encoding, ...) \
Environment* env = Environment::GetCurrent(args); \
CHECK(request->IsObject()); \
FSReqWrap* req_wrap = FSReqWrap::New(env, request.As<Object>(), \
#func, dest, encoding); \
int err = uv_fs_ ## func(env->event_loop(), \
req_wrap->req(), \
__VA_ARGS__, \
After); \
req_wrap->Dispatched(); \
if (err < 0) { \
uv_fs_t* uv_req = req_wrap->req(); \
uv_req->result = err; \
uv_req->path = nullptr; \
After(uv_req); \
req_wrap = nullptr; \
} else { \
args.GetReturnValue().Set(req_wrap->persistent()); \
}
#define ASYNC_CALL(func, req, encoding, ...) \
ASYNC_DEST_CALL(func, req, nullptr, encoding, __VA_ARGS__) \
#define SYNC_DEST_CALL(func, path, dest, ...) \
fs_req_wrap req_wrap; \
env->PrintSyncTrace(); \
int err = uv_fs_ ## func(env->event_loop(), \
&req_wrap.req, \
__VA_ARGS__, \
nullptr); \
if (err < 0) { \
return env->ThrowUVException(err, #func, nullptr, path, dest); \
} \
#define SYNC_CALL(func, path, ...) \
SYNC_DEST_CALL(func, path, nullptr, __VA_ARGS__) \
#define SYNC_REQ req_wrap.req
#define SYNC_RESULT err
void Access(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args.GetIsolate());
HandleScope scope(env->isolate());
if (args.Length() < 2)
return TYPE_ERROR("path and mode are required");
if (!args[1]->IsInt32())
return TYPE_ERROR("mode must be an integer");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
int mode = static_cast<int>(args[1]->Int32Value());
if (args[2]->IsObject()) {
ASYNC_CALL(access, args[2], UTF8, *path, mode);
} else {
SYNC_CALL(access, *path, *path, mode);
}
}
void Close(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("fd is required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be a file descriptor");
int fd = args[0]->Int32Value();
if (args[1]->IsObject()) {
ASYNC_CALL(close, args[1], UTF8, fd)
} else {
SYNC_CALL(close, 0, fd)
}
}
} // anonymous namespace
void FillStatsArray(double* fields, const uv_stat_t* s) {
fields[0] = s->st_dev;
fields[1] = s->st_mode;
fields[2] = s->st_nlink;
fields[3] = s->st_uid;
fields[4] = s->st_gid;
fields[5] = s->st_rdev;
#if defined(__POSIX__)
fields[6] = s->st_blksize;
#else
fields[6] = -1;
#endif
fields[7] = s->st_ino;
fields[8] = s->st_size;
#if defined(__POSIX__)
fields[9] = s->st_blocks;
#else
fields[9] = -1;
#endif
// Dates.
#define X(idx, name) \
fields[idx] = (static_cast<double>(s->st_##name.tv_sec) * 1000) + \
(static_cast<double>(s->st_##name.tv_nsec / 1000000)); \
X(10, atim)
X(11, mtim)
X(12, ctim)
X(13, birthtim)
#undef X
}
// Used to speed up module loading. Returns the contents of the file as
// a string or undefined when the file cannot be opened. The speedup
// comes from not creating Error objects on failure.
static void InternalModuleReadFile(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
uv_loop_t* loop = env->event_loop();
CHECK(args[0]->IsString());
node::Utf8Value path(env->isolate(), args[0]);
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;
}
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);
CHECK_GE(numchars, 0);
offset += numchars;
} while (static_cast<size_t>(numchars) == kBlockSize);
uv_fs_t close_req;
CHECK_EQ(0, uv_fs_close(loop, &close_req, fd, nullptr));
uv_fs_req_cleanup(&close_req);
size_t start = 0;
if (offset >= 3 && 0 == memcmp(&chars[0], "\xEF\xBB\xBF", 3)) {
start = 3; // Skip UTF-8 BOM.
}
Local<String> chars_string =
String::NewFromUtf8(env->isolate(),
&chars[start],
String::kNormalString,
offset - start);
args.GetReturnValue().Set(chars_string);
}
// 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);
if (args.Length() < 1)
return TYPE_ERROR("path required");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
if (args[1]->IsObject()) {
ASYNC_CALL(stat, args[1], UTF8, *path)
} else {
SYNC_CALL(stat, *path, *path)
FillStatsArray(env->fs_stats_field_array(),
static_cast<const uv_stat_t*>(SYNC_REQ.ptr));
}
}
static void LStat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
if (args[1]->IsObject()) {
ASYNC_CALL(lstat, args[1], UTF8, *path)
} else {
SYNC_CALL(lstat, *path, *path)
FillStatsArray(env->fs_stats_field_array(),
static_cast<const uv_stat_t*>(SYNC_REQ.ptr));
}
}
static void FStat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("fd is required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be a file descriptor");
int fd = args[0]->Int32Value();
if (args[1]->IsObject()) {
ASYNC_CALL(fstat, args[1], UTF8, fd)
} else {
SYNC_CALL(fstat, nullptr, fd)
FillStatsArray(env->fs_stats_field_array(),
static_cast<const uv_stat_t*>(SYNC_REQ.ptr));
}
}
static void Symlink(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("target path required");
if (len < 2)
return TYPE_ERROR("src path required");
BufferValue target(env->isolate(), args[0]);
ASSERT_PATH(target)
BufferValue path(env->isolate(), args[1]);
ASSERT_PATH(path)
int flags = 0;
if (args[2]->IsString()) {
node::Utf8Value mode(env->isolate(), args[2]);
if (strcmp(*mode, "dir") == 0) {
flags |= UV_FS_SYMLINK_DIR;
} else if (strcmp(*mode, "junction") == 0) {
flags |= UV_FS_SYMLINK_JUNCTION;
} else if (strcmp(*mode, "file") != 0) {
return env->ThrowError("Unknown symlink type");
}
}
if (args[3]->IsObject()) {
ASYNC_DEST_CALL(symlink, args[3], *path, UTF8, *target, *path, flags)
} else {
SYNC_DEST_CALL(symlink, *target, *path, *target, *path, flags)
}
}
static void Link(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("src path required");
if (len < 2)
return TYPE_ERROR("dest path required");
BufferValue src(env->isolate(), args[0]);
ASSERT_PATH(src)
BufferValue dest(env->isolate(), args[1]);
ASSERT_PATH(dest)
if (args[2]->IsObject()) {
ASYNC_DEST_CALL(link, args[2], *dest, UTF8, *src, *dest)
} else {
SYNC_DEST_CALL(link, *src, *dest, *src, *dest)
}
}
static void ReadLink(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
const int argc = args.Length();
if (argc < 1)
return TYPE_ERROR("path required");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
const enum encoding encoding = ParseEncoding(env->isolate(), args[1], UTF8);
Local<Value> callback = Null(env->isolate());
if (argc == 3)
callback = args[2];
if (callback->IsObject()) {
ASYNC_CALL(readlink, callback, encoding, *path)
} else {
SYNC_CALL(readlink, *path, *path)
const char* link_path = static_cast<const char*>(SYNC_REQ.ptr);
Local<Value> error;
MaybeLocal<Value> rc = StringBytes::Encode(env->isolate(),
link_path,
encoding,
&error);
if (rc.IsEmpty()) {
// TODO(addaleax): Use `error` itself here.
return env->ThrowUVException(UV_EINVAL,
"readlink",
"Invalid character encoding for link",
*path);
}
args.GetReturnValue().Set(rc.ToLocalChecked());
}
}
static void Rename(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("old path required");
if (len < 2)
return TYPE_ERROR("new path required");
BufferValue old_path(env->isolate(), args[0]);
ASSERT_PATH(old_path)
BufferValue new_path(env->isolate(), args[1]);
ASSERT_PATH(new_path)
if (args[2]->IsObject()) {
ASYNC_DEST_CALL(rename, args[2], *new_path, UTF8, *old_path, *new_path)
} else {
SYNC_DEST_CALL(rename, *old_path, *new_path, *old_path, *new_path)
}
}
static void FTruncate(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2)
return TYPE_ERROR("fd and length are required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be a file descriptor");
int fd = args[0]->Int32Value();
// FIXME(bnoordhuis) It's questionable to reject non-ints here but still
// allow implicit coercion from null or undefined to zero. Probably best
// handled in lib/fs.js.
Local<Value> len_v(args[1]);
if (!len_v->IsUndefined() &&
!len_v->IsNull() &&
!IsInt64(len_v->NumberValue())) {
return env->ThrowTypeError("Not an integer");
}
const int64_t len = len_v->IntegerValue();
if (args[2]->IsObject()) {
ASYNC_CALL(ftruncate, args[2], UTF8, fd, len)
} else {
SYNC_CALL(ftruncate, 0, fd, len)
}
}
static void Fdatasync(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("fd is required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be a file descriptor");
int fd = args[0]->Int32Value();
if (args[1]->IsObject()) {
ASYNC_CALL(fdatasync, args[1], UTF8, fd)
} else {
SYNC_CALL(fdatasync, 0, fd)
}
}
static void Fsync(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("fd is required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be a file descriptor");
int fd = args[0]->Int32Value();
if (args[1]->IsObject()) {
ASYNC_CALL(fsync, args[1], UTF8, fd)
} else {
SYNC_CALL(fsync, 0, fd)
}
}
static void Unlink(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
if (args[1]->IsObject()) {
ASYNC_CALL(unlink, args[1], UTF8, *path)
} else {
SYNC_CALL(unlink, *path, *path)
}
}
static void RMDir(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
if (args[1]->IsObject()) {
ASYNC_CALL(rmdir, args[1], UTF8, *path)
} else {
SYNC_CALL(rmdir, *path, *path)
}
}
static void MKDir(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2)
return TYPE_ERROR("path and mode are required");
if (!args[1]->IsInt32())
return TYPE_ERROR("mode must be an integer");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
int mode = static_cast<int>(args[1]->Int32Value());
if (args[2]->IsObject()) {
ASYNC_CALL(mkdir, args[2], UTF8, *path, mode)
} else {
SYNC_CALL(mkdir, *path, *path, mode)
}
}
static void RealPath(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
const int argc = args.Length();
if (argc < 1)
return TYPE_ERROR("path required");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
const enum encoding encoding = ParseEncoding(env->isolate(), args[1], UTF8);
Local<Value> callback = Null(env->isolate());
if (argc == 3)
callback = args[2];
if (callback->IsObject()) {
ASYNC_CALL(realpath, callback, encoding, *path);
} else {
SYNC_CALL(realpath, *path, *path);
const char* link_path = static_cast<const char*>(SYNC_REQ.ptr);
Local<Value> error;
MaybeLocal<Value> rc = StringBytes::Encode(env->isolate(),
link_path,
encoding,
&error);
if (rc.IsEmpty()) {
// TODO(addaleax): Use `error` itself here.
return env->ThrowUVException(UV_EINVAL,
"realpath",
"Invalid character encoding for path",
*path);
}
args.GetReturnValue().Set(rc.ToLocalChecked());
}
}
static void ReadDir(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
const int argc = args.Length();
if (argc < 1)
return TYPE_ERROR("path required");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
const enum encoding encoding = ParseEncoding(env->isolate(), args[1], UTF8);
Local<Value> callback = Null(env->isolate());
if (argc == 3)
callback = args[2];
if (callback->IsObject()) {
ASYNC_CALL(scandir, callback, encoding, *path, 0 /*flags*/)
} else {
SYNC_CALL(scandir, *path, *path, 0 /*flags*/)
CHECK_GE(SYNC_REQ.result, 0);
int r;
Local<Array> names = Array::New(env->isolate(), 0);
Local<Function> fn = env->push_values_to_array_function();
Local<Value> name_v[NODE_PUSH_VAL_TO_ARRAY_MAX];
size_t name_idx = 0;
for (int i = 0; ; i++) {
uv_dirent_t ent;
r = uv_fs_scandir_next(&SYNC_REQ, &ent);
if (r == UV_EOF)
break;
if (r != 0)
return env->ThrowUVException(r, "readdir", "", *path);
Local<Value> error;
MaybeLocal<Value> filename = StringBytes::Encode(env->isolate(),
ent.name,
encoding,
&error);
if (filename.IsEmpty()) {
// TODO(addaleax): Use `error` itself here.
return env->ThrowUVException(UV_EINVAL,
"readdir",
"Invalid character encoding for filename",
*path);
}
name_v[name_idx++] = filename.ToLocalChecked();
if (name_idx >= arraysize(name_v)) {
fn->Call(env->context(), names, name_idx, name_v)
.ToLocalChecked();
name_idx = 0;
}
}
if (name_idx > 0) {
fn->Call(env->context(), names, name_idx, name_v).ToLocalChecked();
}
args.GetReturnValue().Set(names);
}
}
static void Open(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("path required");
if (len < 2)
return TYPE_ERROR("flags required");
if (len < 3)
return TYPE_ERROR("mode required");
if (!args[1]->IsInt32())
return TYPE_ERROR("flags must be an int");
if (!args[2]->IsInt32())
return TYPE_ERROR("mode must be an int");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
int flags = args[1]->Int32Value();
int mode = static_cast<int>(args[2]->Int32Value());
if (args[3]->IsObject()) {
ASYNC_CALL(open, args[3], UTF8, *path, flags, mode)
} else {
SYNC_CALL(open, *path, *path, flags, mode)
args.GetReturnValue().Set(SYNC_RESULT);
}
}
// Wrapper for write(2).
//
// bytesWritten = write(fd, buffer, offset, length, position, callback)
// 0 fd integer. file descriptor
// 1 buffer the data to write
// 2 offset where in the buffer to start from
// 3 length how much to write
// 4 position if integer, position to write at in the file.
// if null, write from the current position
static void WriteBuffer(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args[0]->IsInt32())
return env->ThrowTypeError("First argument must be file descriptor");
CHECK(Buffer::HasInstance(args[1]));
int fd = args[0]->Int32Value();
Local<Object> obj = args[1].As<Object>();
const char* buf = Buffer::Data(obj);
size_t buffer_length = Buffer::Length(obj);
size_t off = args[2]->Uint32Value();
size_t len = args[3]->Uint32Value();
int64_t pos = GET_OFFSET(args[4]);
Local<Value> req = args[5];
if (off > buffer_length)
return env->ThrowRangeError("offset out of bounds");
if (len > buffer_length)
return env->ThrowRangeError("length out of bounds");
if (off + len < off)
return env->ThrowRangeError("off + len overflow");
if (!Buffer::IsWithinBounds(off, len, buffer_length))
return env->ThrowRangeError("off + len > buffer.length");
buf += off;
uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
if (req->IsObject()) {
ASYNC_CALL(write, req, UTF8, fd, &uvbuf, 1, pos)
return;
}
SYNC_CALL(write, nullptr, fd, &uvbuf, 1, pos)
args.GetReturnValue().Set(SYNC_RESULT);
}
// Wrapper for writev(2).
//
// bytesWritten = writev(fd, chunks, position, callback)
// 0 fd integer. file descriptor
// 1 chunks array of buffers to write
// 2 position if integer, position to write at in the file.
// if null, write from the current position
static void WriteBuffers(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args[0]->IsInt32());
CHECK(args[1]->IsArray());
int fd = args[0]->Int32Value();
Local<Array> chunks = args[1].As<Array>();
int64_t pos = GET_OFFSET(args[2]);
Local<Value> req = args[3];
MaybeStackBuffer<uv_buf_t> iovs(chunks->Length());
for (uint32_t i = 0; i < iovs.length(); i++) {
Local<Value> chunk = chunks->Get(i);
if (!Buffer::HasInstance(chunk))
return env->ThrowTypeError("Array elements all need to be buffers");
iovs[i] = uv_buf_init(Buffer::Data(chunk), Buffer::Length(chunk));
}
if (req->IsObject()) {
ASYNC_CALL(write, req, UTF8, fd, *iovs, iovs.length(), pos)
return;
}
SYNC_CALL(write, nullptr, fd, *iovs, iovs.length(), pos)
args.GetReturnValue().Set(SYNC_RESULT);
}
// Wrapper for write(2).
//
// bytesWritten = write(fd, string, position, enc, callback)
// 0 fd integer. file descriptor
// 1 string non-buffer values are converted to strings
// 2 position if integer, position to write at in the file.
// if null, write from the current position
// 3 enc encoding of string
static void WriteString(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args[0]->IsInt32())
return env->ThrowTypeError("First argument must be file descriptor");
Local<Value> req;
Local<Value> string = args[1];
int fd = args[0]->Int32Value();
char* buf = nullptr;
int64_t pos;
size_t len;
FSReqWrap::Ownership ownership = FSReqWrap::COPY;
// will assign buf and len if string was external
if (!StringBytes::GetExternalParts(env->isolate(),
string,
const_cast<const char**>(&buf),
&len)) {
enum encoding enc = ParseEncoding(env->isolate(), args[3], UTF8);
len = StringBytes::StorageSize(env->isolate(), string, enc);
buf = new char[len];
// StorageSize may return too large a char, so correct the actual length
// by the write size
len = StringBytes::Write(env->isolate(), buf, len, args[1], enc);
ownership = FSReqWrap::MOVE;
}
pos = GET_OFFSET(args[2]);
req = args[4];
uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
if (!req->IsObject()) {
// SYNC_CALL returns on error. Make sure to always free the memory.
struct Delete {
inline explicit Delete(char* pointer) : pointer_(pointer) {}
inline ~Delete() { delete[] pointer_; }
char* const pointer_;
};
Delete delete_on_return(ownership == FSReqWrap::MOVE ? buf : nullptr);
SYNC_CALL(write, nullptr, fd, &uvbuf, 1, pos)
return args.GetReturnValue().Set(SYNC_RESULT);
}
FSReqWrap* req_wrap =
FSReqWrap::New(env, req.As<Object>(), "write", buf, UTF8, ownership);
int err = uv_fs_write(env->event_loop(),
req_wrap->req(),
fd,
&uvbuf,
1,
pos,
After);
req_wrap->Dispatched();
if (err < 0) {
uv_fs_t* uv_req = req_wrap->req();
uv_req->result = err;
uv_req->path = nullptr;
After(uv_req);
return;
}
return args.GetReturnValue().Set(req_wrap->persistent());
}
/*
* Wrapper for read(2).
*
* bytesRead = fs.read(fd, buffer, offset, length, position)
*
* 0 fd integer. file descriptor
* 1 buffer instance of Buffer
* 2 offset integer. offset to start reading into inside buffer
* 3 length integer. length to read
* 4 position file position - null for current position
*
*/
static void Read(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2)
return TYPE_ERROR("fd and buffer are required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be a file descriptor");
if (!Buffer::HasInstance(args[1]))
return TYPE_ERROR("Second argument needs to be a buffer");
int fd = args[0]->Int32Value();
Local<Value> req;
size_t len;
int64_t pos;
char * buf = nullptr;
Local<Object> buffer_obj = args[1]->ToObject(env->isolate());
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
size_t off = args[2]->Int32Value();
if (off >= buffer_length) {
return env->ThrowError("Offset is out of bounds");
}
len = args[3]->Int32Value();
if (!Buffer::IsWithinBounds(off, len, buffer_length))
return env->ThrowRangeError("Length extends beyond buffer");
pos = GET_OFFSET(args[4]);
buf = buffer_data + off;
uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
req = args[5];
if (req->IsObject()) {
ASYNC_CALL(read, req, UTF8, fd, &uvbuf, 1, pos);
} else {
SYNC_CALL(read, 0, fd, &uvbuf, 1, pos)
args.GetReturnValue().Set(SYNC_RESULT);
}
}
/* fs.chmod(path, mode);
* Wrapper for chmod(1) / EIO_CHMOD
*/
static void Chmod(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2)
return TYPE_ERROR("path and mode are required");
if (!args[1]->IsInt32())
return TYPE_ERROR("mode must be an integer");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
int mode = static_cast<int>(args[1]->Int32Value());
if (args[2]->IsObject()) {
ASYNC_CALL(chmod, args[2], UTF8, *path, mode);
} else {
SYNC_CALL(chmod, *path, *path, mode);
}
}
/* fs.fchmod(fd, mode);
* Wrapper for fchmod(1) / EIO_FCHMOD
*/
static void FChmod(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2)
return TYPE_ERROR("fd and mode are required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be a file descriptor");
if (!args[1]->IsInt32())
return TYPE_ERROR("mode must be an integer");
int fd = args[0]->Int32Value();
int mode = static_cast<int>(args[1]->Int32Value());
if (args[2]->IsObject()) {
ASYNC_CALL(fchmod, args[2], UTF8, fd, mode);
} else {
SYNC_CALL(fchmod, 0, fd, mode);
}
}
/* fs.chown(path, uid, gid);
* Wrapper for chown(1) / EIO_CHOWN
*/
static void Chown(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("path required");
if (len < 2)
return TYPE_ERROR("uid required");
if (len < 3)
return TYPE_ERROR("gid required");
if (!args[1]->IsUint32())
return TYPE_ERROR("uid must be an unsigned int");
if (!args[2]->IsUint32())
return TYPE_ERROR("gid must be an unsigned int");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
uv_uid_t uid = static_cast<uv_uid_t>(args[1]->Uint32Value());
uv_gid_t gid = static_cast<uv_gid_t>(args[2]->Uint32Value());
if (args[3]->IsObject()) {
ASYNC_CALL(chown, args[3], UTF8, *path, uid, gid);
} else {
SYNC_CALL(chown, *path, *path, uid, gid);
}
}
/* fs.fchown(fd, uid, gid);
* Wrapper for fchown(1) / EIO_FCHOWN
*/
static void FChown(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("fd required");
if (len < 2)
return TYPE_ERROR("uid required");
if (len < 3)
return TYPE_ERROR("gid required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be an int");
if (!args[1]->IsUint32())
return TYPE_ERROR("uid must be an unsigned int");
if (!args[2]->IsUint32())
return TYPE_ERROR("gid must be an unsigned int");
int fd = args[0]->Int32Value();
uv_uid_t uid = static_cast<uv_uid_t>(args[1]->Uint32Value());
uv_gid_t gid = static_cast<uv_gid_t>(args[2]->Uint32Value());
if (args[3]->IsObject()) {
ASYNC_CALL(fchown, args[3], UTF8, fd, uid, gid);
} else {
SYNC_CALL(fchown, 0, fd, uid, gid);
}
}
static void UTimes(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("path required");
if (len < 2)
return TYPE_ERROR("atime required");
if (len < 3)
return TYPE_ERROR("mtime required");
if (!args[1]->IsNumber())
return TYPE_ERROR("atime must be a number");
if (!args[2]->IsNumber())
return TYPE_ERROR("mtime must be a number");
BufferValue path(env->isolate(), args[0]);
ASSERT_PATH(path)
const double atime = static_cast<double>(args[1]->NumberValue());
const double mtime = static_cast<double>(args[2]->NumberValue());
if (args[3]->IsObject()) {
ASYNC_CALL(utime, args[3], UTF8, *path, atime, mtime);
} else {
SYNC_CALL(utime, *path, *path, atime, mtime);
}
}
static void FUTimes(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("fd required");
if (len < 2)
return TYPE_ERROR("atime required");
if (len < 3)
return TYPE_ERROR("mtime required");
if (!args[0]->IsInt32())
return TYPE_ERROR("fd must be an int");
if (!args[1]->IsNumber())
return TYPE_ERROR("atime must be a number");
if (!args[2]->IsNumber())
return TYPE_ERROR("mtime must be a number");
const int fd = args[0]->Int32Value();
const double atime = static_cast<double>(args[1]->NumberValue());
const double mtime = static_cast<double>(args[2]->NumberValue());
if (args[3]->IsObject()) {
ASYNC_CALL(futime, args[3], UTF8, fd, atime, mtime);
} else {
SYNC_CALL(futime, 0, fd, atime, mtime);
}
}
static void Mkdtemp(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK_GE(args.Length(), 2);
BufferValue tmpl(env->isolate(), args[0]);
if (*tmpl == nullptr)
return TYPE_ERROR("template must be a string or Buffer");
const enum encoding encoding = ParseEncoding(env->isolate(), args[1], UTF8);
if (args[2]->IsObject()) {
ASYNC_CALL(mkdtemp, args[2], encoding, *tmpl);
} else {
SYNC_CALL(mkdtemp, *tmpl, *tmpl);
const char* path = static_cast<const char*>(SYNC_REQ.path);
Local<Value> error;
MaybeLocal<Value> rc =
StringBytes::Encode(env->isolate(), path, encoding, &error);
if (rc.IsEmpty()) {
// TODO(addaleax): Use `error` itself here.
return env->ThrowUVException(UV_EINVAL,
"mkdtemp",
"Invalid character encoding for filename",
*tmpl);
}
args.GetReturnValue().Set(rc.ToLocalChecked());
}
}
void GetStatValues(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
double* fields = env->fs_stats_field_array();
if (fields == nullptr) {
// stat fields contains twice the number of entries because `fs.StatWatcher`
// needs room to store data for *two* `fs.Stats` instances.
fields = new double[2 * 14];
env->set_fs_stats_field_array(fields);
}
Local<ArrayBuffer> ab = ArrayBuffer::New(env->isolate(),
fields,
sizeof(double) * 2 * 14);
Local<Float64Array> fields_array = Float64Array::New(ab, 0, 2 * 14);
args.GetReturnValue().Set(fields_array);
}
void InitFs(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
env->SetMethod(target, "access", Access);
env->SetMethod(target, "close", Close);
env->SetMethod(target, "open", Open);
env->SetMethod(target, "read", Read);
env->SetMethod(target, "fdatasync", Fdatasync);
env->SetMethod(target, "fsync", Fsync);
env->SetMethod(target, "rename", Rename);
env->SetMethod(target, "ftruncate", FTruncate);
env->SetMethod(target, "rmdir", RMDir);
env->SetMethod(target, "mkdir", MKDir);
env->SetMethod(target, "readdir", ReadDir);
env->SetMethod(target, "internalModuleReadFile", InternalModuleReadFile);
env->SetMethod(target, "internalModuleStat", InternalModuleStat);
env->SetMethod(target, "stat", Stat);
env->SetMethod(target, "lstat", LStat);
env->SetMethod(target, "fstat", FStat);
env->SetMethod(target, "link", Link);
env->SetMethod(target, "symlink", Symlink);
env->SetMethod(target, "readlink", ReadLink);
env->SetMethod(target, "unlink", Unlink);
env->SetMethod(target, "writeBuffer", WriteBuffer);
env->SetMethod(target, "writeBuffers", WriteBuffers);
env->SetMethod(target, "writeString", WriteString);
env->SetMethod(target, "realpath", RealPath);
env->SetMethod(target, "chmod", Chmod);
env->SetMethod(target, "fchmod", FChmod);
// env->SetMethod(target, "lchmod", LChmod);
env->SetMethod(target, "chown", Chown);
env->SetMethod(target, "fchown", FChown);
// env->SetMethod(target, "lchown", LChown);
env->SetMethod(target, "utimes", UTimes);
env->SetMethod(target, "futimes", FUTimes);
env->SetMethod(target, "mkdtemp", Mkdtemp);
env->SetMethod(target, "getStatValues", GetStatValues);
StatWatcher::Initialize(env, target);
// Create FunctionTemplate for FSReqWrap
Local<FunctionTemplate> fst =
FunctionTemplate::New(env->isolate(), NewFSReqWrap);
fst->InstanceTemplate()->SetInternalFieldCount(1);
fst->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "FSReqWrap"));
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "FSReqWrap"),
fst->GetFunction());
}
} // end namespace node
NODE_MODULE_CONTEXT_AWARE_BUILTIN(fs, node::InitFs)