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::String;
42 using v8::Uint32;
43 using v8::Value;
44
45
Initialize(Environment * env,Local<Object> target)46 void StatWatcher::Initialize(Environment* env, Local<Object> target) {
47 HandleScope scope(env->isolate());
48
49 Local<FunctionTemplate> t = env->NewFunctionTemplate(StatWatcher::New);
50 t->InstanceTemplate()->SetInternalFieldCount(
51 StatWatcher::kInternalFieldCount);
52 Local<String> statWatcherString =
53 FIXED_ONE_BYTE_STRING(env->isolate(), "StatWatcher");
54 t->SetClassName(statWatcherString);
55 t->Inherit(HandleWrap::GetConstructorTemplate(env));
56
57 env->SetProtoMethod(t, "start", StatWatcher::Start);
58
59 target->Set(env->context(), statWatcherString,
60 t->GetFunction(env->context()).ToLocalChecked()).Check();
61 }
62
63
StatWatcher(Environment * env,Local<Object> wrap,bool use_bigint)64 StatWatcher::StatWatcher(Environment* env,
65 Local<Object> wrap,
66 bool use_bigint)
67 : HandleWrap(env,
68 wrap,
69 reinterpret_cast<uv_handle_t*>(&watcher_),
70 AsyncWrap::PROVIDER_STATWATCHER),
71 use_bigint_(use_bigint) {
72 CHECK_EQ(0, uv_fs_poll_init(env->event_loop(), &watcher_));
73 }
74
75
Callback(uv_fs_poll_t * handle,int status,const uv_stat_t * prev,const uv_stat_t * curr)76 void StatWatcher::Callback(uv_fs_poll_t* handle,
77 int status,
78 const uv_stat_t* prev,
79 const uv_stat_t* curr) {
80 StatWatcher* wrap = ContainerOf(&StatWatcher::watcher_, handle);
81 Environment* env = wrap->env();
82 HandleScope handle_scope(env->isolate());
83 Context::Scope context_scope(env->context());
84
85 Local<Value> arr = fs::FillGlobalStatsArray(env, wrap->use_bigint_, curr);
86 USE(fs::FillGlobalStatsArray(env, wrap->use_bigint_, prev, true));
87
88 Local<Value> argv[2] = { Integer::New(env->isolate(), status), arr };
89 wrap->MakeCallback(env->onchange_string(), arraysize(argv), argv);
90 }
91
92
New(const FunctionCallbackInfo<Value> & args)93 void StatWatcher::New(const FunctionCallbackInfo<Value>& args) {
94 CHECK(args.IsConstructCall());
95 Environment* env = Environment::GetCurrent(args);
96 new StatWatcher(env, args.This(), args[0]->IsTrue());
97 }
98
99 // wrap.start(filename, interval)
Start(const FunctionCallbackInfo<Value> & args)100 void StatWatcher::Start(const FunctionCallbackInfo<Value>& args) {
101 CHECK_EQ(args.Length(), 2);
102
103 StatWatcher* wrap;
104 ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
105 CHECK(!uv_is_active(wrap->GetHandle()));
106
107 node::Utf8Value path(args.GetIsolate(), args[0]);
108 CHECK_NOT_NULL(*path);
109
110 CHECK(args[1]->IsUint32());
111 const uint32_t interval = args[1].As<Uint32>()->Value();
112
113 // Note that uv_fs_poll_start does not return ENOENT, we are handling
114 // mostly memory errors here.
115 const int err = uv_fs_poll_start(&wrap->watcher_, Callback, *path, interval);
116 if (err != 0) {
117 args.GetReturnValue().Set(err);
118 }
119 }
120
121 } // namespace node
122