Current File : //proc/self/root/usr/src/node-v0.10.4/src/fs_event_wrap.cc
// 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 "handle_wrap.h"
#include <stdlib.h>
using namespace v8;
namespace node {
static Persistent<String> onchange_sym;
class FSEventWrap: public HandleWrap {
public:
static void Initialize(Handle<Object> target);
static Handle<Value> New(const Arguments& args);
static Handle<Value> Start(const Arguments& args);
static Handle<Value> Close(const Arguments& args);
private:
FSEventWrap(Handle<Object> object);
virtual ~FSEventWrap();
static void OnEvent(uv_fs_event_t* handle, const char* filename, int events,
int status);
uv_fs_event_t handle_;
bool initialized_;
};
FSEventWrap::FSEventWrap(Handle<Object> object): HandleWrap(object,
(uv_handle_t*)&handle_) {
handle_.data = static_cast<void*>(this);
initialized_ = false;
}
FSEventWrap::~FSEventWrap() {
assert(initialized_ == false);
}
void FSEventWrap::Initialize(Handle<Object> target) {
HandleWrap::Initialize(target);
HandleScope scope;
Local<FunctionTemplate> t = FunctionTemplate::New(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(String::NewSymbol("FSEvent"));
NODE_SET_PROTOTYPE_METHOD(t, "start", Start);
NODE_SET_PROTOTYPE_METHOD(t, "close", Close);
target->Set(String::NewSymbol("FSEvent"),
Persistent<FunctionTemplate>::New(t)->GetFunction());
}
Handle<Value> FSEventWrap::New(const Arguments& args) {
HandleScope scope;
assert(args.IsConstructCall());
new FSEventWrap(args.This());
return scope.Close(args.This());
}
Handle<Value> FSEventWrap::Start(const Arguments& args) {
HandleScope scope;
UNWRAP(FSEventWrap)
if (args.Length() < 1 || !args[0]->IsString()) {
return ThrowException(Exception::TypeError(String::New("Bad arguments")));
}
String::Utf8Value path(args[0]);
int r = uv_fs_event_init(uv_default_loop(), &wrap->handle_, *path, OnEvent, 0);
if (r == 0) {
// Check for persistent argument
if (!args[1]->IsTrue()) {
uv_unref(reinterpret_cast<uv_handle_t*>(&wrap->handle_));
}
wrap->initialized_ = true;
} else {
SetErrno(uv_last_error(uv_default_loop()));
}
return scope.Close(Integer::New(r));
}
void FSEventWrap::OnEvent(uv_fs_event_t* handle, const char* filename,
int events, int status) {
HandleScope scope;
Local<String> eventStr;
FSEventWrap* wrap = static_cast<FSEventWrap*>(handle->data);
assert(wrap->object_.IsEmpty() == false);
// We're in a bind here. libuv can set both UV_RENAME and UV_CHANGE but
// the Node API only lets us pass a single event to JS land.
//
// The obvious solution is to run the callback twice, once for each event.
// However, since the second event is not allowed to fire if the handle is
// closed after the first event, and since there is no good way to detect
// closed handles, that option is out.
//
// For now, ignore the UV_CHANGE event if UV_RENAME is also set. Make the
// assumption that a rename implicitly means an attribute change. Not too
// unreasonable, right? Still, we should revisit this before v1.0.
if (status) {
SetErrno(uv_last_error(uv_default_loop()));
eventStr = String::Empty();
}
else if (events & UV_RENAME) {
eventStr = String::New("rename");
}
else if (events & UV_CHANGE) {
eventStr = String::New("change");
}
else {
assert(0 && "bad fs events flag");
abort();
}
Local<Value> argv[3] = {
Integer::New(status),
eventStr,
filename ? static_cast<Local<Value> >(String::New(filename))
: Local<Value>::New(v8::Null())
};
if (onchange_sym.IsEmpty()) {
onchange_sym = NODE_PSYMBOL("onchange");
}
MakeCallback(wrap->object_, onchange_sym, ARRAY_SIZE(argv), argv);
}
Handle<Value> FSEventWrap::Close(const Arguments& args) {
HandleScope scope;
// Unwrap manually here. The UNWRAP() macro asserts that wrap != NULL.
// That usually indicates an error but not here: double closes are possible
// and legal, HandleWrap::Close() deals with them the same way.
assert(!args.Holder().IsEmpty());
assert(args.Holder()->InternalFieldCount() > 0);
void* ptr = args.Holder()->GetPointerFromInternalField(0);
FSEventWrap* wrap = static_cast<FSEventWrap*>(ptr);
if (wrap == NULL || wrap->initialized_ == false) {
return Undefined();
}
wrap->initialized_ = false;
return HandleWrap::Close(args);
}
} // namespace node
NODE_MODULE(node_fs_event_wrap, node::FSEventWrap::Initialize)
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