1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
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
|
#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 "string_bytes.h"
#include <stdlib.h>
namespace node {
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
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(Local<Object> target,
Local<Value> unused,
Local<Context> context);
static void New(const FunctionCallbackInfo<Value>& args);
static void Start(const FunctionCallbackInfo<Value>& args);
static void Close(const FunctionCallbackInfo<Value>& args);
size_t self_size() const override { return sizeof(*this); }
private:
static const encoding kDefaultEncoding = UTF8;
FSEventWrap(Environment* env, Local<Object> object);
~FSEventWrap() override;
static void OnEvent(uv_fs_event_t* handle, const char* filename, int events,
int status);
uv_fs_event_t handle_;
bool initialized_ = false;
enum encoding encoding_ = kDefaultEncoding;
};
FSEventWrap::FSEventWrap(Environment* env, Local<Object> object)
: HandleWrap(env,
object,
reinterpret_cast<uv_handle_t*>(&handle_),
AsyncWrap::PROVIDER_FSEVENTWRAP) {}
FSEventWrap::~FSEventWrap() {
CHECK_EQ(initialized_, false);
}
void FSEventWrap::Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context) {
Environment* env = Environment::GetCurrent(context);
auto fsevent_string = FIXED_ONE_BYTE_STRING(env->isolate(), "FSEvent");
Local<FunctionTemplate> t = env->NewFunctionTemplate(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(fsevent_string);
env->SetProtoMethod(t, "start", Start);
env->SetProtoMethod(t, "close", Close);
target->Set(fsevent_string, t->GetFunction());
}
void FSEventWrap::New(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
Environment* env = Environment::GetCurrent(args);
new FSEventWrap(env, args.This());
}
void FSEventWrap::Start(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
FSEventWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK_EQ(wrap->initialized_, false);
static const char kErrMsg[] = "filename must be a string or Buffer";
if (args.Length() < 1)
return env->ThrowTypeError(kErrMsg);
BufferValue path(env->isolate(), args[0]);
if (*path == nullptr)
return env->ThrowTypeError(kErrMsg);
unsigned int flags = 0;
if (args[2]->IsTrue())
flags |= UV_FS_EVENT_RECURSIVE;
wrap->encoding_ = ParseEncoding(env->isolate(), args[3], kDefaultEncoding);
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());
CHECK_EQ(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(env->isolate());
} else if (events & UV_RENAME) {
event_string = env->rename_string();
} else if (events & UV_CHANGE) {
event_string = env->change_string();
} else {
CHECK(0 && "bad fs events flag");
}
Local<Value> argv[] = {
Integer::New(env->isolate(), status),
event_string,
Null(env->isolate())
};
if (filename != nullptr) {
Local<Value> fn = StringBytes::Encode(env->isolate(),
filename,
wrap->encoding_);
if (fn.IsEmpty()) {
argv[0] = Integer::New(env->isolate(), UV_EINVAL);
argv[2] = StringBytes::Encode(env->isolate(),
filename,
strlen(filename),
BUFFER);
} else {
argv[2] = fn;
}
}
wrap->MakeCallback(env->onchange_string(), arraysize(argv), argv);
}
void FSEventWrap::Close(const FunctionCallbackInfo<Value>& args) {
FSEventWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
if (wrap == nullptr || wrap->initialized_ == false)
return;
wrap->initialized_ = false;
HandleWrap::Close(args);
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE_BUILTIN(fs_event_wrap, node::FSEventWrap::Initialize)
|