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 "node_stat_watcher.h"
23 #include "async_wrap-inl.h"
24 #include "env-inl.h"
25 #include "memory_tracker-inl.h"
26 #include "node_external_reference.h"
27 #include "node_file-inl.h"
28 #include "util-inl.h"
29
30 #include <cstring>
31 #include <cstdlib>
32
33 namespace node {
34
35 using v8::Context;
36 using v8::FunctionCallbackInfo;
37 using v8::FunctionTemplate;
38 using v8::HandleScope;
39 using v8::Integer;
40 using v8::Isolate;
41 using v8::Local;
42 using v8::Object;
43 using v8::Uint32;
44 using v8::Value;
45
Initialize(Environment * env,Local<Object> target)46 void StatWatcher::Initialize(Environment* env, Local<Object> target) {
47 Isolate* isolate = env->isolate();
48 HandleScope scope(env->isolate());
49
50 Local<FunctionTemplate> t = NewFunctionTemplate(isolate, StatWatcher::New);
51 t->InstanceTemplate()->SetInternalFieldCount(
52 StatWatcher::kInternalFieldCount);
53 t->Inherit(HandleWrap::GetConstructorTemplate(env));
54
55 SetProtoMethod(isolate, t, "start", StatWatcher::Start);
56
57 SetConstructorFunction(env->context(), target, "StatWatcher", t);
58 }
59
RegisterExternalReferences(ExternalReferenceRegistry * registry)60 void StatWatcher::RegisterExternalReferences(
61 ExternalReferenceRegistry* registry) {
62 registry->Register(StatWatcher::New);
63 registry->Register(StatWatcher::Start);
64 }
65
StatWatcher(fs::BindingData * binding_data,Local<Object> wrap,bool use_bigint)66 StatWatcher::StatWatcher(fs::BindingData* binding_data,
67 Local<Object> wrap,
68 bool use_bigint)
69 : HandleWrap(binding_data->env(),
70 wrap,
71 reinterpret_cast<uv_handle_t*>(&watcher_),
72 AsyncWrap::PROVIDER_STATWATCHER),
73 use_bigint_(use_bigint),
74 binding_data_(binding_data) {
75 CHECK_EQ(0, uv_fs_poll_init(env()->event_loop(), &watcher_));
76 }
77
78
Callback(uv_fs_poll_t * handle,int status,const uv_stat_t * prev,const uv_stat_t * curr)79 void StatWatcher::Callback(uv_fs_poll_t* handle,
80 int status,
81 const uv_stat_t* prev,
82 const uv_stat_t* curr) {
83 StatWatcher* wrap = ContainerOf(&StatWatcher::watcher_, handle);
84 Environment* env = wrap->env();
85 HandleScope handle_scope(env->isolate());
86 Context::Scope context_scope(env->context());
87
88 Local<Value> arr = fs::FillGlobalStatsArray(
89 wrap->binding_data_.get(), wrap->use_bigint_, curr);
90 USE(fs::FillGlobalStatsArray(
91 wrap->binding_data_.get(), wrap->use_bigint_, prev, true));
92
93 Local<Value> argv[2] = { Integer::New(env->isolate(), status), arr };
94 wrap->MakeCallback(env->onchange_string(), arraysize(argv), argv);
95 }
96
97
New(const FunctionCallbackInfo<Value> & args)98 void StatWatcher::New(const FunctionCallbackInfo<Value>& args) {
99 CHECK(args.IsConstructCall());
100 fs::BindingData* binding_data = Realm::GetBindingData<fs::BindingData>(args);
101 new StatWatcher(binding_data, args.This(), args[0]->IsTrue());
102 }
103
104 // wrap.start(filename, interval)
Start(const FunctionCallbackInfo<Value> & args)105 void StatWatcher::Start(const FunctionCallbackInfo<Value>& args) {
106 CHECK_EQ(args.Length(), 2);
107
108 StatWatcher* wrap;
109 ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
110 CHECK(!uv_is_active(wrap->GetHandle()));
111
112 node::Utf8Value path(args.GetIsolate(), args[0]);
113 CHECK_NOT_NULL(*path);
114
115 CHECK(args[1]->IsUint32());
116 const uint32_t interval = args[1].As<Uint32>()->Value();
117
118 // Note that uv_fs_poll_start does not return ENOENT, we are handling
119 // mostly memory errors here.
120 const int err = uv_fs_poll_start(&wrap->watcher_, Callback, *path, interval);
121 if (err != 0) {
122 args.GetReturnValue().Set(err);
123 }
124 }
125
126 } // namespace node
127