1 // Copyright Joyent, Inc. and other Node contributors.
2 //
3 // Permission is hereby granted, free of charge, to any person obtaining a
4 // copy of this software and associated documentation files (the
5 // "Software"), to deal in the Software without restriction, including
6 // without limitation the rights to use, copy, modify, merge, publish,
7 // distribute, sublicense, and/or sell copies of the Software, and to permit
8 // persons to whom the Software is furnished to do so, subject to the
9 // following conditions:
10 //
11 // The above copyright notice and this permission notice shall be included
12 // in all copies or substantial portions of the Software.
13 //
14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
17 // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
18 // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
19 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20 // USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22 #include "memory_tracker-inl.h"
23 #include "node_stat_watcher.h"
24 #include "async_wrap-inl.h"
25 #include "env-inl.h"
26 #include "node_file-inl.h"
27 #include "util-inl.h"
28
29 #include <cstring>
30 #include <cstdlib>
31
32 namespace node {
33
34 using v8::Context;
35 using v8::FunctionCallbackInfo;
36 using v8::FunctionTemplate;
37 using v8::HandleScope;
38 using v8::Integer;
39 using v8::Local;
40 using v8::Object;
41 using v8::Uint32;
42 using v8::Value;
43
44
Initialize(Environment * env,Local<Object> target)45 void StatWatcher::Initialize(Environment* env, Local<Object> target) {
46 HandleScope scope(env->isolate());
47
48 Local<FunctionTemplate> t = env->NewFunctionTemplate(StatWatcher::New);
49 t->InstanceTemplate()->SetInternalFieldCount(
50 StatWatcher::kInternalFieldCount);
51 t->Inherit(HandleWrap::GetConstructorTemplate(env));
52
53 env->SetProtoMethod(t, "start", StatWatcher::Start);
54
55 env->SetConstructorFunction(target, "StatWatcher", t);
56 }
57
58
StatWatcher(fs::BindingData * binding_data,Local<Object> wrap,bool use_bigint)59 StatWatcher::StatWatcher(fs::BindingData* binding_data,
60 Local<Object> wrap,
61 bool use_bigint)
62 : HandleWrap(binding_data->env(),
63 wrap,
64 reinterpret_cast<uv_handle_t*>(&watcher_),
65 AsyncWrap::PROVIDER_STATWATCHER),
66 use_bigint_(use_bigint),
67 binding_data_(binding_data) {
68 CHECK_EQ(0, uv_fs_poll_init(env()->event_loop(), &watcher_));
69 }
70
71
Callback(uv_fs_poll_t * handle,int status,const uv_stat_t * prev,const uv_stat_t * curr)72 void StatWatcher::Callback(uv_fs_poll_t* handle,
73 int status,
74 const uv_stat_t* prev,
75 const uv_stat_t* curr) {
76 StatWatcher* wrap = ContainerOf(&StatWatcher::watcher_, handle);
77 Environment* env = wrap->env();
78 HandleScope handle_scope(env->isolate());
79 Context::Scope context_scope(env->context());
80
81 Local<Value> arr = fs::FillGlobalStatsArray(
82 wrap->binding_data_.get(), wrap->use_bigint_, curr);
83 USE(fs::FillGlobalStatsArray(
84 wrap->binding_data_.get(), wrap->use_bigint_, prev, true));
85
86 Local<Value> argv[2] = { Integer::New(env->isolate(), status), arr };
87 wrap->MakeCallback(env->onchange_string(), arraysize(argv), argv);
88 }
89
90
New(const FunctionCallbackInfo<Value> & args)91 void StatWatcher::New(const FunctionCallbackInfo<Value>& args) {
92 CHECK(args.IsConstructCall());
93 fs::BindingData* binding_data =
94 Environment::GetBindingData<fs::BindingData>(args);
95 new StatWatcher(binding_data, args.This(), args[0]->IsTrue());
96 }
97
98 // wrap.start(filename, interval)
Start(const FunctionCallbackInfo<Value> & args)99 void StatWatcher::Start(const FunctionCallbackInfo<Value>& args) {
100 CHECK_EQ(args.Length(), 2);
101
102 StatWatcher* wrap;
103 ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
104 CHECK(!uv_is_active(wrap->GetHandle()));
105
106 node::Utf8Value path(args.GetIsolate(), args[0]);
107 CHECK_NOT_NULL(*path);
108
109 CHECK(args[1]->IsUint32());
110 const uint32_t interval = args[1].As<Uint32>()->Value();
111
112 // Note that uv_fs_poll_start does not return ENOENT, we are handling
113 // mostly memory errors here.
114 const int err = uv_fs_poll_start(&wrap->watcher_, Callback, *path, interval);
115 if (err != 0) {
116 args.GetReturnValue().Set(err);
117 }
118 }
119
120 } // namespace node
121