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file system methods to be queued.

v0.7.4-release
Ryan 16 years ago
parent
e5a6b07d6a
commit
dd691decd2
4 changed files with 209 additions and 221 deletions
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  1. 285
      src/file.cc
  2. 60
      src/file.js
  3. 7
      src/main.js
  4. 12
      test/simple.js

285
src/file.cc
View File

@ -13,88 +13,140 @@ using namespace v8;
#define FD_SYMBOL v8::String::NewSymbol("fd")
#define ACTION_QUEUE_SYMBOL v8::String::NewSymbol("_actionQueue")
class File;
class Callback {
public:
Callback(Handle<Value> v);
~Callback();
Local<Value> Call(Handle<Object> recv, int argc, Handle<Value> argv[]);
File *file;
private:
Persistent<Function> handle_;
};
// This is the file system object which contains methods
// for accessing the file system (like rename, mkdir, etC).
// In javascript it is called "File".
static Persistent<Object> fs;
Callback::Callback (Handle<Value> v)
static void
CallTopCallback (Handle<Object> handle, const int argc, Handle<Value> argv[])
{
HandleScope scope;
Handle<Function> f = Handle<Function>::Cast(v);
handle_ = Persistent<Function>::New(f);
Local<Value> queue_value = handle->Get(ACTION_QUEUE_SYMBOL);
assert(queue_value->IsArray());
Local<Array> queue = Local<Array>::Cast(queue_value);
Local<Value> top_value = queue->Get(Integer::New(0));
if (top_value->IsObject()) {
Local<Object> top = top_value->ToObject();
Local<Value> callback_value = top->Get(String::NewSymbol("callback"));
if (callback_value->IsFunction()) {
Handle<Function> callback = Handle<Function>::Cast(callback_value);
TryCatch try_catch;
callback->Call(handle, argc, argv);
if(try_catch.HasCaught()) {
node_fatal_exception(try_catch);
return;
}
}
}
// poll_actions
Local<Value> poll_actions_value = handle->Get(String::NewSymbol("_pollActions"));
assert(poll_actions_value->IsFunction());
Handle<Function> poll_actions = Handle<Function>::Cast(poll_actions_value);
poll_actions->Call(handle, 0, NULL);
}
Callback::~Callback ()
static void
InitActionQueue (Handle<Object> handle)
{
handle_.Dispose();
handle_.Clear(); // necessary?
handle->Set(ACTION_QUEUE_SYMBOL, Array::New());
}
Local<Value>
Callback::Call (Handle<Object> recv, int argc, Handle<Value> argv[])
class File {
public:
File (Handle<Object> handle);
~File ();
static File* Unwrap (Handle<Object> handle);
static Handle<Value> Open (const Arguments& args);
static int AfterOpen (eio_req *req);
static Handle<Value> Close (const Arguments& args);
static int AfterClose (eio_req *req);
static Handle<Value> Write (const Arguments& args);
static int AfterWrite (eio_req *req);
static Handle<Value> Read (const Arguments& args);
static int AfterRead (eio_req *req);
private:
bool HasUtf8Encoding (void);
Persistent<Object> handle_;
int GetFD (void);
static void MakeWeak (Persistent<Value> _, void *data);
};
class FileSystem {
public:
static Handle<Value> Rename (const Arguments& args);
static int AfterRename (eio_req *req);
static Handle<Value> Stat (const Arguments& args);
static int AfterStat (eio_req *req);
};
Handle<Value>
FileSystem::Rename (const Arguments& args)
{
if (args.Length() < 2)
return Undefined();
HandleScope scope;
Local<Value> r = handle_->Call(recv, argc, argv);
return scope.Close(r);
String::Utf8Value path(args[0]->ToString());
String::Utf8Value new_path(args[1]->ToString());
eio_req *req = eio_rename(*path, *new_path, EIO_PRI_DEFAULT, AfterRename, NULL);
node_eio_submit(req);
return Undefined();
}
static int
AfterRename (eio_req *req)
int
FileSystem::AfterRename (eio_req *req)
{
Callback *callback = static_cast<Callback*>(req->data);
if (callback != NULL) {
HandleScope scope;
const int argc = 2;
const int argc = 1;
Local<Value> argv[argc];
argv[0] = Integer::New(req->errorno);
argv[1] = String::New(strerror(req->errorno));
callback->Call(Context::GetCurrent()->Global(), argc, argv);
delete callback;
}
CallTopCallback(fs, argc, argv);
return 0;
}
JS_METHOD(rename)
Handle<Value>
FileSystem::Stat (const Arguments& args)
{
if (args.Length() < 2)
return Undefined();
if (args.Length() < 1)
return v8::Undefined();
HandleScope scope;
String::Utf8Value path(args[0]->ToString());
String::Utf8Value new_path(args[1]->ToString());
Callback *callback = NULL;
if (!args[2]->IsUndefined()) callback = new Callback(args[2]);
eio_req *req = eio_rename(*path, *new_path, EIO_PRI_DEFAULT, AfterRename, callback);
eio_req *req = eio_stat(*path, EIO_PRI_DEFAULT, AfterStat, NULL);
node_eio_submit(req);
return Undefined();
}
static int
AfterStat (eio_req *req)
int
FileSystem::AfterStat (eio_req *req)
{
Callback *callback = static_cast<Callback*>(req->data);
if (callback != NULL) {
HandleScope scope;
const int argc = 3;
const int argc = 2;
Local<Value> argv[argc];
argv[0] = Integer::New(req->errorno);
Local<Object> stats = Object::New();
argv[0] = stats;
argv[1] = Integer::New(req->errorno);
argv[2] = String::New(strerror(req->errorno));
argv[1] = stats;
if (req->result == 0) {
struct stat *s = static_cast<struct stat*>(req->ptr2);
@ -127,69 +179,23 @@ AfterStat (eio_req *req)
stats->Set(JS_SYMBOL("ctime"), Date::New(1000*static_cast<double>(s->st_ctime)));
}
callback->Call(Context::GetCurrent()->Global(), argc, argv);
delete callback;
}
return 0;
}
JS_METHOD(stat)
{
if (args.Length() < 1)
return v8::Undefined();
HandleScope scope;
String::Utf8Value path(args[0]->ToString());
CallTopCallback(fs, argc, argv);
Callback *callback = NULL;
if (!args[1]->IsUndefined()) callback = new Callback(args[1]);
eio_req *req = eio_stat(*path, EIO_PRI_DEFAULT, AfterStat, callback);
node_eio_submit(req);
return Undefined();
return 0;
}
///////////////////// FILE /////////////////////
class File {
public:
File (Handle<Object> handle);
~File ();
static File* Unwrap (Handle<Object> handle);
static Handle<Value> Open (const Arguments& args);
static int AfterOpen (eio_req *req);
static Handle<Value> Close (const Arguments& args);
static int AfterClose (eio_req *req);
static Handle<Value> Write (const Arguments& args);
static int AfterWrite (eio_req *req);
static Handle<Value> Read (const Arguments& args);
static int AfterRead (eio_req *req);
private:
bool HasUtf8Encoding (void);
int GetFD (void);
static void MakeWeak (Persistent<Value> _, void *data);
void CallTopCallback (const int argc, Handle<Value> argv[]);
Persistent<Object> handle_;
};
File::File (Handle<Object> handle)
{
HandleScope scope;
handle_ = Persistent<Object>::New(handle);
InitActionQueue(handle);
Handle<External> external = External::New(this);
handle_->SetInternalField(0, external);
handle_.MakeWeak(this, File::MakeWeak);
handle_->Set(ACTION_QUEUE_SYMBOL, Array::New());
}
File::~File ()
@ -222,38 +228,6 @@ File::GetFD (void)
int fd = fd_value->IntegerValue();
}
void
File::CallTopCallback (const int argc, Handle<Value> argv[])
{
HandleScope scope;
Local<Value> queue_value = handle_->Get(ACTION_QUEUE_SYMBOL);
assert(queue_value->IsArray());
Local<Array> queue = Local<Array>::Cast(queue_value);
Local<Value> top_value = queue->Get(Integer::New(0));
if (top_value->IsObject()) {
Local<Object> top = top_value->ToObject();
Local<Value> callback_value = top->Get(String::NewSymbol("callback"));
if (callback_value->IsFunction()) {
Handle<Function> callback = Handle<Function>::Cast(callback_value);
TryCatch try_catch;
callback->Call(handle_, argc, argv);
if(try_catch.HasCaught()) {
node_fatal_exception(try_catch);
return;
}
}
}
// poll_actions
Local<Value> poll_actions_value = handle_->Get(String::NewSymbol("_pollActions"));
assert(poll_actions_value->IsFunction());
Handle<Function> poll_actions = Handle<Function>::Cast(poll_actions_value);
poll_actions->Call(handle_, 0, NULL);
}
void
File::MakeWeak (Persistent<Value> _, void *data)
@ -289,7 +263,7 @@ File::AfterClose (eio_req *req)
const int argc = 1;
Local<Value> argv[argc];
argv[0] = Integer::New(req->errorno);
file->CallTopCallback(argc, argv);
CallTopCallback(file->handle_, argc, argv);
return 0;
}
@ -331,11 +305,8 @@ File::Open (const Arguments& args)
}
}
// Get the current umask
mode_t mask = umask(0);
umask(mask);
eio_req *req = eio_open (*path, flags, mask, EIO_PRI_DEFAULT, File::AfterOpen, file);
// TODO how should the mode be set?
eio_req *req = eio_open (*path, flags, 0666, EIO_PRI_DEFAULT, File::AfterOpen, file);
node_eio_submit(req);
return Undefined();
@ -354,7 +325,7 @@ File::AfterOpen (eio_req *req)
const int argc = 1;
Handle<Value> argv[argc];
argv[0] = Integer::New(req->errorno);
file->CallTopCallback(argc, argv);
CallTopCallback(file->handle_, argc, argv);
return 0;
}
@ -423,7 +394,7 @@ File::AfterWrite (eio_req *req)
Local<Value> argv[argc];
argv[0] = Integer::New(req->errorno);
argv[1] = written >= 0 ? Integer::New(written) : Integer::New(0);
file->CallTopCallback(argc, argv);
CallTopCallback(file->handle_, argc, argv);
return 0;
}
@ -458,11 +429,15 @@ File::AfterRead (eio_req *req)
Local<Value> argv[argc];
argv[0] = Integer::New(req->errorno);
Local<String> buffer;
size_t length = req->result;
char *buf = static_cast<char*>(req->ptr2);
if(req->result == 0) {
// eof
argv[1] = Local<Value>::New(Null());
} else {
size_t length = req->result;
if (file->HasUtf8Encoding()) {
// utf8 encoding
argv[1] = String::New(buf, req->result);
} else {
// raw encoding
@ -472,9 +447,8 @@ File::AfterRead (eio_req *req)
}
argv[1] = array;
}
file->CallTopCallback(argc, argv);
}
CallTopCallback(file->handle_, argc, argv);
return 0;
}
@ -492,28 +466,27 @@ NewFile (const Arguments& args)
void
NodeInit_file (Handle<Object> target)
{
HandleScope scope;
Local<Object> fs = Object::New();
target->Set(String::NewSymbol("fs"), fs);
if (!fs.IsEmpty())
return;
JS_SET_METHOD(fs, "rename", rename);
JS_SET_METHOD(fs, "stat", stat);
HandleScope scope;
Local<FunctionTemplate> file_template = FunctionTemplate::New(NewFile);
file_template->InstanceTemplate()->SetInternalFieldCount(1);
target->Set(String::NewSymbol("File"), file_template->GetFunction());
// class methods for File
file_template->GetFunction()->Set(String::NewSymbol("STDIN_FILENO"),
Integer::New(STDIN_FILENO));
fs = Persistent<Object>::New(file_template->GetFunction());
InitActionQueue(fs);
file_template->GetFunction()->Set(String::NewSymbol("STDOUT_FILENO"),
Integer::New(STDOUT_FILENO));
target->Set(String::NewSymbol("File"), fs);
file_template->GetFunction()->Set(String::NewSymbol("STDERR_FILENO"),
Integer::New(STDERR_FILENO));
// file system methods
JS_SET_METHOD(fs, "_ffi_rename", FileSystem::Rename);
JS_SET_METHOD(fs, "_ffi_stat", FileSystem::Stat);
fs->Set(String::NewSymbol("STDIN_FILENO"), Integer::New(STDIN_FILENO));
fs->Set(String::NewSymbol("STDOUT_FILENO"), Integer::New(STDOUT_FILENO));
fs->Set(String::NewSymbol("STDERR_FILENO"), Integer::New(STDERR_FILENO));
// file methods
JS_SET_METHOD(file_template->InstanceTemplate(), "_ffi_open", File::Open);
JS_SET_METHOD(file_template->InstanceTemplate(), "_ffi_close", File::Close);
JS_SET_METHOD(file_template->InstanceTemplate(), "_ffi_write", File::Write);

60
src/file.js
View File

@ -1,3 +1,27 @@
File.rename = function (file1, file2, callback) {
this._addAction("rename", [file1, file2], callback);
};
File.prototype.puts = function (data, callback) {
this.write(data + "\n", callback);
};
File.prototype.open = function (path, mode, callback) {
this._addAction("open", [path, mode], callback);
};
File.prototype.close = function (callback) {
this._addAction("close", [], callback);
};
File.prototype.write = function (buf, callback) {
this._addAction("write", [buf], callback);
};
File.prototype.read = function (length, callback) {
this._addAction("read", [length], callback);
};
// Some explanation of the File binding.
//
// All file operations are blocking. To get around this they are executed
@ -20,28 +44,10 @@
// element of _actionQueue in order to get a handle on the callback
// function. Only after that completion callback has been made can the
// action be shifted out of the queue.
File.prototype.puts = function (data, callback) {
this.write(data + "\n", callback);
};
File.prototype.open = function (path, mode, callback) {
this._addAction("open", [path, mode], callback);
};
File.prototype.close = function (callback) {
this._addAction("close", [], callback);
};
File.prototype.write = function (buf, callback) {
this._addAction("write", [buf], callback);
};
File.prototype.read = function (length, callback) {
this._addAction("read", [length], callback);
};
File.prototype._addAction = function (method, args, callback) {
//
// See File::CallTopCallback() in file.cc to see the other side of the
// binding.
File._addAction = File.prototype._addAction = function (method, args, callback) {
this._actionQueue.push({ method: method
, callback: callback
, args: args
@ -49,7 +55,7 @@ File.prototype._addAction = function (method, args, callback) {
if (this._actionQueue.length == 1) this._act();
}
File.prototype._act = function () {
File._act = File.prototype._act = function () {
var action = this._actionQueue[0];
if (action)
this["_ffi_" + action.method].apply(this, action.args);
@ -57,7 +63,7 @@ File.prototype._act = function () {
// called from C++ after each action finishes
// (i.e. when it returns from the thread pool)
File.prototype._pollActions = function () {
File._pollActions = File.prototype._pollActions = function () {
this._actionQueue.shift();
this._act();
};
@ -68,8 +74,6 @@ stdout.fd = File.STDOUT_FILENO;
var stderr = new File();
stderr.fd = File.STDERR_FILENO;
var stdin = new File();
stdin.fd = File.STDIN_FILENO;
Array.prototype.encodeUtf8 = function () {
return String.fromCharCode.apply(String, this);
}

7
src/main.js
View File

@ -1,6 +1,11 @@
// module search paths
node.includes = ["."];
// This is useful for dealing with raw encodings.
Array.prototype.encodeUtf8 = function () {
return String.fromCharCode.apply(String, this);
}
node.path = new function () {
this.join = function () {
var joined = "";
@ -42,7 +47,7 @@ function __require (path, loading_file) {
} else {
//filename = node.path.join(node.path.dirname(loading_file), path);
}
stdout.puts("require: " + filename);
//stdout.puts("require: " + filename);
var source = node.blocking.cat(filename);

12
test/simple.js
View File

@ -1,18 +1,24 @@
var f = new File;
f.open("/tmp/world", "r+", function (status) {
f.open("/tmp/world", "w+", function (status) {
if (status == 0) {
stdout.puts("file open");
f.write("hello world\n")
f.write("hello world\n");
f.write("something else.\n", function () {
stdout.puts("written. ");
});
f.read(100, function (status, buf) {
if (buf)
stdout.puts("read: >>" + buf.encodeUtf8() + "<<");
});
} else {
stdout.puts("file open failed: " + status.toString());
}
f.close(function () { stdout.puts("closed.") });
f.close(function (status) {
stdout.puts("closed: " + status.toString());
File.rename("/tmp/world", "/tmp/hello", function (status) {
stdout.puts("rename: " + status.toString());
});
});
});

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