node/src/node_stdio.cc at master · tilgovi/node · GitHub

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#include <node_stdio.h>

#include <node_events.h>

#include <coupling.h>

#include <unistd.h>

#include <fcntl.h>

using namespace v8;

using namespace node;

static Persistent<Object> stdio;

static Persistent<Function> emit;

static struct coupling *stdin_coupling = NULL;

static struct coupling *stdout_coupling = NULL;

static int stdin_fd = -1;

static int stdout_fd = -1;

static evcom_reader in;

static evcom_writer out;

static enum encoding stdin_encoding;

static void

EmitInput (Local<Value> input)

{

HandleScope scope;

Local<Value> argv[2] = { String::NewSymbol("data"), input };

emit->Call(stdio, 2, argv);

}

static void

EmitClose (void)

{

HandleScope scope;

Local<Value> argv[1] = { String::NewSymbol("close") };

emit->Call(stdio, 1, argv);

}

/* STDERR IS ALWAY SYNC */

static Handle<Value>

WriteError (const Arguments& args)

{

HandleScope scope;

if (args.Length() < 1)

return Undefined();

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

fprintf(stderr, "%s", *msg);

fflush(stderr);

return Undefined();

}

static Handle<Value>

Write (const Arguments& args)

{

HandleScope scope;

if (args.Length() == 0) {

return ThrowException(Exception::Error(String::New("Bad argument")));

}

enum encoding enc = UTF8;

if (args.Length() > 1) enc = ParseEncoding(args[1], UTF8);

ssize_t len = DecodeBytes(args[0], enc);

if (len < 0) {

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

return ThrowException(exception);

}

char buf[len];

ssize_t written = DecodeWrite(buf, len, args[0], enc);

assert(written == len);

evcom_writer_write(&out, buf, len);

return Undefined();

}

static void

detach_in (evcom_reader *r)

{

assert(r == &in);

HandleScope scope;

EmitClose();

evcom_reader_detach(&in);

if (stdin_coupling) {

coupling_destroy(stdin_coupling);

stdin_coupling = NULL;

}

stdin_fd = -1;

}

static void

detach_out (evcom_writer* w)

{

assert(w == &out);

evcom_writer_detach(&out);

if (stdout_coupling) {

coupling_destroy(stdout_coupling);

stdout_coupling = NULL;

}

stdout_fd = -1;

}

static void

on_read (evcom_reader *r, const void *buf, size_t len)

{

assert(r == &in);

HandleScope scope;

if (!len) {

return;

}

Local<Value> data = Encode(buf, len, stdin_encoding);

EmitInput(data);

}

static inline int

set_nonblock (int fd)

{

int flags = fcntl(fd, F_GETFL, 0);

if (flags == -1) return -1;

int r = fcntl(fd, F_SETFL, flags | O_NONBLOCK);

if (r == -1) return -1;

return 0;

}

static Handle<Value>

Open (const Arguments& args)

{

HandleScope scope;

if (stdin_fd >= 0) {

return ThrowException(Exception::Error(String::New("stdin already open")));

}

stdin_encoding = UTF8;

if (args.Length() > 0) {

stdin_encoding = ParseEncoding(args[0]);

}

if (isatty(STDIN_FILENO)) {

// XXX selecting on tty fds wont work in windows.

// Must ALWAYS make a coupling on shitty platforms.

stdin_fd = STDIN_FILENO;

} else {

stdin_coupling = coupling_new_pull(STDIN_FILENO);

stdin_fd = coupling_nonblocking_fd(stdin_coupling);

}

set_nonblock(stdin_fd);

evcom_reader_init(&in);

in.on_read = on_read;

in.on_close = detach_in;

evcom_reader_set(&in, stdin_fd);

evcom_reader_attach(EV_DEFAULT_ &in);

return Undefined();

}

static Handle<Value>

Close (const Arguments& args)

{

HandleScope scope;

assert(stdio == args.Holder());

if (stdin_fd < 0) {

return ThrowException(Exception::Error(String::New("stdin not open")));

}

evcom_reader_close(&in);

return Undefined();

}

void

Stdio::Initialize (v8::Handle<v8::Object> target)

{

HandleScope scope;

Local<Object> stdio_local =

EventEmitter::constructor_template->GetFunction()->NewInstance(0, NULL);

stdio = Persistent<Object>::New(stdio_local);

NODE_SET_METHOD(stdio, "open", Open);

NODE_SET_METHOD(stdio, "write", Write);

NODE_SET_METHOD(stdio, "writeError", WriteError);

NODE_SET_METHOD(stdio, "close", Close);

target->Set(String::NewSymbol("stdio"), stdio);

Local<Value> emit_v = stdio->Get(String::NewSymbol("emit"));

assert(emit_v->IsFunction());

Local<Function> emit_f = Local<Function>::Cast(emit_v);

emit = Persistent<Function>::New(emit_f);

if (isatty(STDOUT_FILENO)) {

// XXX selecting on tty fds wont work in windows.

// Must ALWAYS make a coupling on shitty platforms.

stdout_fd = STDOUT_FILENO;

} else {

stdout_coupling = coupling_new_push(STDOUT_FILENO);

stdout_fd = coupling_nonblocking_fd(stdout_coupling);

}

set_nonblock(stdout_fd);

evcom_writer_init(&out);

out.on_close = detach_out;

evcom_writer_set(&out, stdout_fd);

evcom_writer_attach(EV_DEFAULT_ &out);

}

node/src/node_stdio.cc at master · tilgovi/node · GitHub

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