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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 "async-wrap.h"
#include "async-wrap-inl.h"
#include "env.h"
#include "env-inl.h"
#include "util.h"
#include "util-inl.h"
#include "node.h"
#include "handle_wrap.h"
#include <stdlib.h>
namespace node {
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::Handle;
using v8::HandleScope;
using v8::Integer;
using v8::Local;
using v8::Object;
using v8::String;
using v8::Value;
class FSEventWrap: public HandleWrap {
public:
static void Initialize(Handle<Object> target,
Handle<Value> unused,
Handle<Context> context);
static void New(const FunctionCallbackInfo<Value>& args);
static void Start(const FunctionCallbackInfo<Value>& args);
static void Close(const FunctionCallbackInfo<Value>& args);
private:
FSEventWrap(Environment* env, 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(Environment* env, Handle<Object> object)
: HandleWrap(env, object, reinterpret_cast<uv_handle_t*>(&handle_)) {
initialized_ = false;
}
FSEventWrap::~FSEventWrap() {
assert(initialized_ == false);
}
void FSEventWrap::Initialize(Handle<Object> target,
Handle<Value> unused,
Handle<Context> context) {
Local<FunctionTemplate> t = FunctionTemplate::New(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(FIXED_ONE_BYTE_STRING(node_isolate, "FSEvent"));
NODE_SET_PROTOTYPE_METHOD(t, "start", Start);
NODE_SET_PROTOTYPE_METHOD(t, "close", Close);
target->Set(FIXED_ONE_BYTE_STRING(node_isolate, "FSEvent"), t->GetFunction());
}
void FSEventWrap::New(const FunctionCallbackInfo<Value>& args) {
assert(args.IsConstructCall());
HandleScope handle_scope(args.GetIsolate());
Environment* env = Environment::GetCurrent(args.GetIsolate());
new FSEventWrap(env, args.This());
}
void FSEventWrap::Start(const FunctionCallbackInfo<Value>& args) {
HandleScope scope(node_isolate);
FSEventWrap* wrap = Unwrap<FSEventWrap>(args.This());
if (args.Length() < 1 || !args[0]->IsString()) {
return ThrowTypeError("Bad arguments");
}
String::Utf8Value path(args[0]);
unsigned int flags = 0;
if (args[2]->IsTrue())
flags |= UV_FS_EVENT_RECURSIVE;
int err = uv_fs_event_init(wrap->env()->event_loop(), &wrap->handle_);
if (err == 0) {
wrap->initialized_ = true;
err = uv_fs_event_start(&wrap->handle_, OnEvent, *path, flags);
if (err == 0) {
// Check for persistent argument
if (!args[1]->IsTrue()) {
uv_unref(reinterpret_cast<uv_handle_t*>(&wrap->handle_));
}
} else {
FSEventWrap::Close(args);
}
}
args.GetReturnValue().Set(err);
}
void FSEventWrap::OnEvent(uv_fs_event_t* handle, const char* filename,
int events, int status) {
FSEventWrap* wrap = static_cast<FSEventWrap*>(handle->data);
Environment* env = wrap->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
assert(wrap->persistent().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.
Local<String> event_string;
if (status) {
event_string = String::Empty(node_isolate);
} else if (events & UV_RENAME) {
event_string = env->rename_string();
} else if (events & UV_CHANGE) {
event_string = env->change_string();
} else {
assert(0 && "bad fs events flag");
abort();
}
Local<Value> argv[] = {
Integer::New(status, node_isolate),
event_string,
Null(node_isolate)
};
if (filename != NULL) {
argv[2] = OneByteString(node_isolate, filename);
}
wrap->MakeCallback(env->onchange_string(), ARRAY_SIZE(argv), argv);
}
void FSEventWrap::Close(const FunctionCallbackInfo<Value>& args) {
HandleScope scope(node_isolate);
FSEventWrap* wrap = Unwrap<FSEventWrap>(args.This());
if (wrap == NULL || wrap->initialized_ == false)
return;
wrap->initialized_ = false;
HandleWrap::Close(args);
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE(node_fs_event_wrap, node::FSEventWrap::Initialize)
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