node/src/node_file.cc at master · waveto/node · GitHub

History

659 lines (535 loc) · 17 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

#include <node_file.h>

#include <node_buffer.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <dirent.h>

#include <fcntl.h>

#include <stdlib.h>

#include <unistd.h>

#include <assert.h>

#include <string.h>

#include <errno.h>

#include <limits.h>

/* used for readlink, AIX doesn't provide it */

#ifndef PATH_MAX

#define PATH_MAX 4096

#endif

namespace node {

using namespace v8;

#define MIN(a,b) ((a) < (b) ? (a) : (b))

#define THROW_BAD_ARGS \

ThrowException(Exception::TypeError(String::New("Bad argument")))

static Persistent<String> encoding_symbol;

static Persistent<String> errno_symbol;

static inline Local<Value> errno_exception(int errorno) {

Local<Value> e = Exception::Error(String::NewSymbol(strerror(errorno)));

Local<Object> obj = e->ToObject();

obj->Set(errno_symbol, Integer::New(errorno));

return e;

}

static int After(eio_req *req) {

HandleScope scope;

Persistent<Function> *callback = cb_unwrap(req->data);

ev_unref(EV_DEFAULT_UC);

int argc = 0;

Local<Value> argv[6]; // 6 is the maximum number of args

if (req->errorno != 0) {

argc = 1;

argv[0] = errno_exception(req->errorno);

} else {

// Note: the error is always given the first argument of the callback.

// If there is no error then then the first argument is null.

argv[0] = Local<Value>::New(Null());

switch (req->type) {

case EIO_CLOSE:

case EIO_RENAME:

case EIO_UNLINK:

case EIO_RMDIR:

case EIO_MKDIR:

case EIO_FTRUNCATE:

case EIO_LINK:

case EIO_SYMLINK:

case EIO_CHMOD:

argc = 0;

break;

case EIO_OPEN:

case EIO_SENDFILE:

argc = 2;

argv[1] = Integer::New(req->result);

break;

case EIO_WRITE:

argc = 2;

argv[1] = Integer::New(req->result);

break;

case EIO_STAT:

case EIO_LSTAT:

{

struct stat *s = reinterpret_cast<struct stat*>(req->ptr2);

argc = 2;

argv[1] = BuildStatsObject(s);

break;

}

case EIO_READLINK:

{

argc = 2;

argv[1] = String::New(static_cast<char*>(req->ptr2), req->result);

break;

}

case EIO_READ:

{

argc = 3;

Local<Object> obj = Local<Object>::New(*callback);

Local<Value> enc_val = obj->GetHiddenValue(encoding_symbol);

argv[1] = Encode(req->ptr2, req->result, ParseEncoding(enc_val));

argv[2] = Integer::New(req->result);

break;

}

case EIO_READDIR:

{

char *namebuf = static_cast<char*>(req->ptr2);

int nnames = req->result;

Local<Array> names = Array::New(nnames);

for (int i = 0; i < nnames; i++) {

Local<String> name = String::New(namebuf);

names->Set(Integer::New(i), name);

#ifndef NDEBUG

namebuf += strlen(namebuf);

assert(*namebuf == '\0');

namebuf += 1;

#else

namebuf += strlen(namebuf) + 1;

#endif

}

argc = 2;

argv[1] = names;

break;

}

default:

assert(0 && "Unhandled eio response");

}

if (req->type == EIO_WRITE && req->int3 == 1) {

assert(req->ptr2);

delete [] reinterpret_cast<char*>(req->ptr2);

}

TryCatch try_catch;

(*callback)->Call(Context::GetCurrent()->Global(), argc, argv);

if (try_catch.HasCaught()) {

FatalException(try_catch);

}

// Dispose of the persistent handle

cb_destroy(callback);

return 0;

}

#define ASYNC_CALL(func, callback, ...) \

eio_req *req = eio_##func(__VA_ARGS__, EIO_PRI_DEFAULT, After, \

cb_persist(callback)); \

assert(req); \

ev_ref(EV_DEFAULT_UC); \

return Undefined();

static Handle<Value> Close(const Arguments& args) {

HandleScope scope;

if (args.Length() < 1 || !args[0]->IsInt32()) {

return THROW_BAD_ARGS;

}

int fd = args[0]->Int32Value();

if (args[1]->IsFunction()) {

ASYNC_CALL(close, args[1], fd)

} else {

int ret = close(fd);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

static Handle<Value> Stat(const Arguments& args) {

HandleScope scope;

if (args.Length() < 1 || !args[0]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

if (args[1]->IsFunction()) {

ASYNC_CALL(stat, args[1], *path)

} else {

struct stat s;

int ret = stat(*path, &s);

if (ret != 0) return ThrowException(errno_exception(errno));

return scope.Close(BuildStatsObject(&s));

}

static Handle<Value> LStat(const Arguments& args) {

HandleScope scope;

if (args.Length() < 1 || !args[0]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

if (args[1]->IsFunction()) {

ASYNC_CALL(lstat, args[1], *path)

} else {

struct stat s;

int ret = lstat(*path, &s);

if (ret != 0) return ThrowException(errno_exception(errno));

return scope.Close(BuildStatsObject(&s));

}

static Handle<Value> Symlink(const Arguments& args) {

HandleScope scope;

if (args.Length() < 2 || !args[0]->IsString() || !args[1]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value dest(args[0]->ToString());

String::Utf8Value path(args[1]->ToString());

if (args[2]->IsFunction()) {

ASYNC_CALL(symlink, args[2], *dest, *path)

} else {

int ret = symlink(*dest, *path);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

static Handle<Value> Link(const Arguments& args) {

HandleScope scope;

if (args.Length() < 2 || !args[0]->IsString() || !args[1]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value orig_path(args[0]->ToString());

String::Utf8Value new_path(args[1]->ToString());

if (args[2]->IsFunction()) {

ASYNC_CALL(link, args[2], *orig_path, *new_path)

} else {

int ret = link(*orig_path, *new_path);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

static Handle<Value> ReadLink(const Arguments& args) {

HandleScope scope;

if (args.Length() < 1 || !args[0]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

if (args[1]->IsFunction()) {

ASYNC_CALL(readlink, args[1], *path)

} else {

char buf[PATH_MAX];

ssize_t bz = readlink(*path, buf, PATH_MAX);

if (bz == -1) return ThrowException(errno_exception(errno));

return scope.Close(String::New(buf, bz));

}

static Handle<Value> Rename(const Arguments& args) {

HandleScope scope;

if (args.Length() < 2 || !args[0]->IsString() || !args[1]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value old_path(args[0]->ToString());

String::Utf8Value new_path(args[1]->ToString());

if (args[2]->IsFunction()) {

ASYNC_CALL(rename, args[2], *old_path, *new_path)

} else {

int ret = rename(*old_path, *new_path);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

static Handle<Value> Truncate(const Arguments& args) {

HandleScope scope;

if (args.Length() < 2 || !args[0]->IsInt32()) {

return THROW_BAD_ARGS;

}

int fd = args[0]->Int32Value();

off_t len = args[1]->Uint32Value();

if (args[2]->IsFunction()) {

ASYNC_CALL(ftruncate, args[2], fd, len)

} else {

int ret = ftruncate(fd, len);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

static Handle<Value> Unlink(const Arguments& args) {

HandleScope scope;

if (args.Length() < 1 || !args[0]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

if (args[1]->IsFunction()) {

ASYNC_CALL(unlink, args[1], *path)

} else {

int ret = unlink(*path);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

static Handle<Value> RMDir(const Arguments& args) {

HandleScope scope;

if (args.Length() < 1 || !args[0]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

if (args[1]->IsFunction()) {

ASYNC_CALL(rmdir, args[1], *path)

} else {

int ret = rmdir(*path);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

static Handle<Value> MKDir(const Arguments& args) {

HandleScope scope;

if (args.Length() < 2 || !args[0]->IsString() || !args[1]->IsInt32()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

mode_t mode = static_cast<mode_t>(args[1]->Int32Value());

if (args[2]->IsFunction()) {

ASYNC_CALL(mkdir, args[2], *path, mode)

} else {

int ret = mkdir(*path, mode);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

static Handle<Value> SendFile(const Arguments& args) {

HandleScope scope;

if (args.Length() < 4 ||

!args[0]->IsInt32() ||

!args[1]->IsInt32() ||

!args[3]->IsNumber()) {

return THROW_BAD_ARGS;

}

int out_fd = args[0]->Int32Value();

int in_fd = args[1]->Int32Value();

off_t in_offset = args[2]->IsNumber() ? args[2]->IntegerValue() : -1;

size_t length = args[3]->IntegerValue();

if (args[4]->IsFunction()) {

ASYNC_CALL(sendfile, args[4], out_fd, in_fd, in_offset, length)

} else {

ssize_t sent = eio_sendfile_sync (out_fd, in_fd, in_offset, length);

// XXX is this the right errno to use?

if (sent < 0) return ThrowException(errno_exception(errno));

return Integer::New(sent);

}

static Handle<Value> ReadDir(const Arguments& args) {

HandleScope scope;

if (args.Length() < 1 || !args[0]->IsString()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

if (args[1]->IsFunction()) {

ASYNC_CALL(readdir, args[1], *path, 0 /*flags*/)

} else {

DIR *dir = opendir(*path);

if (!dir) return ThrowException(errno_exception(errno));

struct dirent *ent;

Local<Array> files = Array::New();

char *name;

int i = 0;

while (ent = readdir(dir)) {

name = ent->d_name;

if (name[0] != '.' || (name[1] && (name[1] != '.' || name[2]))) {

files->Set(Integer::New(i), String::New(name));

i++;

}

closedir(dir);

return scope.Close(files);

}

static Handle<Value> Open(const Arguments& args) {

HandleScope scope;

if (args.Length() < 3 ||

!args[0]->IsString() ||

!args[1]->IsInt32() ||

!args[2]->IsInt32()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

int flags = args[1]->Int32Value();

mode_t mode = static_cast<mode_t>(args[2]->Int32Value());

if (args[3]->IsFunction()) {

ASYNC_CALL(open, args[3], *path, flags, mode)

} else {

int fd = open(*path, flags, mode);

if (fd < 0) return ThrowException(errno_exception(errno));

return scope.Close(Integer::New(fd));

}

// write(fd, data, position, enc, callback)

// Wrapper for write(2).

// 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

// - OR -

// 0 fd integer. file descriptor

// 1 string the data to write

// 2 position if integer, position to write at in the file.

// if null, write from the current position

// 3 encoding

static Handle<Value> Write(const Arguments& args) {

HandleScope scope;

if (!args[0]->IsInt32()) {

return THROW_BAD_ARGS;

}

int fd = args[0]->Int32Value();

off_t pos;

ssize_t len;

char * buf;

ssize_t written;

Local<Value> cb;

bool legacy;

if (Buffer::HasInstance(args[1])) {

legacy = false;

// buffer

// 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

Buffer * buffer = ObjectWrap::Unwrap<Buffer>(args[1]->ToObject());

size_t off = args[2]->Int32Value();

if (off >= buffer->length()) {

return ThrowException(Exception::Error(

String::New("Offset is out of bounds")));

}

len = args[3]->Int32Value();

if (off + len > buffer->length()) {

return ThrowException(Exception::Error(

String::New("Length is extends beyond buffer")));

}

pos = args[4]->IsNumber() ? args[4]->IntegerValue() : -1;

buf = (char*)buffer->data() + off;

cb = args[5];

} else {

legacy = true;

// legacy interface.. args[1] is a string

pos = args[2]->IsNumber() ? args[2]->IntegerValue() : -1;

enum encoding enc = ParseEncoding(args[3]);

len = DecodeBytes(args[1], enc);

if (len < 0) {

Local<Value> exception = Exception::TypeError(String::New("Bad argument"));

return ThrowException(exception);

}

buf = new char[len];

written = DecodeWrite(buf, len, args[1], enc);

assert(written == len);

cb = args[4];

}

if (cb->IsFunction()) {

// WARNING: HACK AHEAD, PROCEED WITH CAUTION

// Normally here I would do

// ASYNC_CALL(write, cb, fd, buf, len, pos)

// however, I'm trying to support a legacy interface; where in the

// String version a buffer is allocated to encode into. In the After()

// function it is freed. However in the other version, we just increase

// the reference count to a buffer. We have to let After() know which

// version is being done so it can know if it needs to free 'buf' or

// not. We do that by using req->int3.

// req->int3 == 1 legacy, String version. Need to free `buf`.

// req->int3 == 0 Buffer version. Don't do anything.

eio_req *req = eio_write(fd, buf, len, pos,

EIO_PRI_DEFAULT,

After,

cb_persist(cb));

assert(req);

req->int3 = legacy ? 1 : 0;

ev_ref(EV_DEFAULT_UC);

return Undefined();

} else {

if (pos < 0) {

written = write(fd, buf, len);

} else {

written = pwrite(fd, buf, len, pos);

}

if (written < 0) return ThrowException(errno_exception(errno));

return scope.Close(Integer::New(written));

}

/* node.fs.read(fd, length, position, encoding)

* Wrapper for read(2).

* 0 fd integer. file descriptor

* 1 length integer. length to read

* 2 position if integer, position to read from in the file.

* if null, read from the current position

* 3 encoding

static Handle<Value> Read(const Arguments& args) {

HandleScope scope;

if (args.Length() < 2 || !args[0]->IsInt32() || !args[1]->IsNumber()) {

return THROW_BAD_ARGS;

}

int fd = args[0]->Int32Value();

size_t len = args[1]->IntegerValue();

off_t offset = args[2]->IsNumber() ? args[2]->IntegerValue() : -1;

enum encoding encoding = ParseEncoding(args[3]);

if (args[4]->IsFunction()) {

Local<Object> obj = args[4]->ToObject();

obj->SetHiddenValue(encoding_symbol, args[3]);

ASYNC_CALL(read, args[4], fd, NULL, len, offset)

} else {

#define READ_BUF_LEN (16*1024)

char *buf[READ_BUF_LEN];

ssize_t ret;

if (offset < 0) {

ret = read(fd, buf, MIN(len, READ_BUF_LEN));

} else {

ret = pread(fd, buf, MIN(len, READ_BUF_LEN), offset);

}

if (ret < 0) return ThrowException(errno_exception(errno));

Local<Array> a = Array::New(2);

a->Set(Integer::New(0), Encode(buf, ret, encoding));

a->Set(Integer::New(1), Integer::New(ret));

return scope.Close(a);

}

/* node.fs.chmod(fd, mode);

* Wrapper for chmod(1) / EIO_CHMOD

static Handle<Value> Chmod(const Arguments& args){

HandleScope scope;

if(args.Length() < 2 || !args[0]->IsString() || !args[1]->IsInt32()) {

return THROW_BAD_ARGS;

}

String::Utf8Value path(args[0]->ToString());

mode_t mode = static_cast<mode_t>(args[1]->Int32Value());

if(args[2]->IsFunction()) {

ASYNC_CALL(chmod, args[2], *path, mode);

} else {

int ret = chmod(*path, mode);

if (ret != 0) return ThrowException(errno_exception(errno));

return Undefined();

}

void File::Initialize(Handle<Object> target) {

HandleScope scope;

NODE_SET_METHOD(target, "close", Close);

NODE_SET_METHOD(target, "open", Open);

NODE_SET_METHOD(target, "read", Read);

NODE_SET_METHOD(target, "rename", Rename);

NODE_SET_METHOD(target, "truncate", Truncate);

NODE_SET_METHOD(target, "rmdir", RMDir);

NODE_SET_METHOD(target, "mkdir", MKDir);

NODE_SET_METHOD(target, "sendfile", SendFile);

NODE_SET_METHOD(target, "readdir", ReadDir);

NODE_SET_METHOD(target, "stat", Stat);

NODE_SET_METHOD(target, "lstat", LStat);

NODE_SET_METHOD(target, "link", Link);

NODE_SET_METHOD(target, "symlink", Symlink);

NODE_SET_METHOD(target, "readlink", ReadLink);

NODE_SET_METHOD(target, "unlink", Unlink);

NODE_SET_METHOD(target, "write", Write);

NODE_SET_METHOD(target, "chmod", Chmod);

errno_symbol = NODE_PSYMBOL("errno");

encoding_symbol = NODE_PSYMBOL("node:encoding");

}

} // end namespace node

node/src/node_file.cc at master · waveto/node · GitHub

Expand file tree

Breadcrumbs

node_file.cc

Latest commit

History

Breadcrumbs

node_file.cc

File metadata and controls