1 /*
2 * Copyright (c) 2023-2025 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "watcher.h"
17
18 #include <cstring>
19 #include <fcntl.h>
20 #include <memory>
21 #include <tuple>
22 #include <unistd.h>
23
24 #include "class_watcher/watcher_entity.h"
25 #include "class_watcher/watcher_n_exporter.h"
26 #include "file_utils.h"
27 #include "filemgmt_libhilog.h"
28
29 namespace OHOS::FileManagement::ModuleFileIO {
30 using namespace std;
31 using namespace OHOS::FileManagement::LibN;
32
CreateAndCheckForWatcherEntity(napi_env env)33 static tuple<napi_value, int32_t> CreateAndCheckForWatcherEntity(napi_env env)
34 {
35 if (FileWatcher::GetInstance().GetNotifyId() < 0 && !FileWatcher::GetInstance().InitNotify()) {
36 HILOGE("Failed to get notifyId or initnotify fail");
37 return {nullptr, errno};
38 }
39 napi_value objWatcher = NClass::InstantiateClass(env, WatcherNExporter::className_, {});
40 if (!objWatcher) {
41 HILOGE("Failed to instantiate watcher");
42 return {nullptr, EIO};
43 }
44 return {objWatcher, ERRNO_NOERR};
45 }
46
ParseParam(const napi_env & env,const napi_callback_info & info,int32_t & errCode)47 shared_ptr<WatcherInfoArg> ParseParam(const napi_env &env, const napi_callback_info &info, int32_t &errCode)
48 {
49 NFuncArg funcArg(env, info);
50 if (!funcArg.InitArgs(NARG_CNT::THREE)) {
51 HILOGE("Failed to get param.");
52 errCode = EINVAL;
53 return nullptr;
54 }
55
56 auto [succGetPath, filename, unused] = NVal(env, funcArg[NARG_POS::FIRST]).ToUTF8StringPath();
57 if (!succGetPath) {
58 HILOGE("Failed to get watcher path.");
59 errCode = EINVAL;
60 return nullptr;
61 }
62
63 auto [succGetEvent, events] = NVal(env, funcArg[NARG_POS::SECOND]).ToInt32();
64 if (!succGetEvent || events <= 0 || !FileWatcher::GetInstance().CheckEventValid(events)) {
65 HILOGE("Failed to get watcher event.");
66 errCode = EINVAL;
67 return nullptr;
68 }
69
70 if (!NVal(env, funcArg[NARG_POS::THIRD]).TypeIs(napi_function)) {
71 HILOGE("Failed to get callback");
72 errCode = EINVAL;
73 return nullptr;
74 }
75 auto infoArg = CreateSharedPtr<WatcherInfoArg>(NVal(env, funcArg[NARG_POS::THIRD]));
76 if (infoArg == nullptr) {
77 HILOGE("Failed to request heap memory.");
78 errCode = ENOMEM;
79 return nullptr;
80 }
81 infoArg->events = static_cast<uint32_t>(events);
82 infoArg->env = env;
83 infoArg->fileName = string(filename.get());
84
85 return infoArg;
86 }
87
CreateWatcher(napi_env env,napi_callback_info info)88 napi_value Watcher::CreateWatcher(napi_env env, napi_callback_info info)
89 {
90 int errCode = 0;
91 auto infoArg = ParseParam(env, info, errCode);
92 if (errCode != 0) {
93 HILOGE("Failed to parse param");
94 NError(errCode).ThrowErr(env);
95 return nullptr;
96 }
97
98 auto [objWatcher, err] = CreateAndCheckForWatcherEntity(env);
99 if (!objWatcher) {
100 HILOGE("Failed to create watcher entity.");
101 NError(err).ThrowErr(env);
102 return nullptr;
103 }
104
105 auto watcherEntity = NClass::GetEntityOf<WatcherEntity>(env, objWatcher);
106 if (!watcherEntity) {
107 HILOGE("Failed to get WatcherEntity.");
108 NError(EIO).ThrowErr(env);
109 return nullptr;
110 }
111 watcherEntity->data_ = infoArg;
112
113 bool ret = FileWatcher::GetInstance().AddWatcherInfo(infoArg->fileName, infoArg);
114 if (!ret) {
115 HILOGE("Failed to add watcher info.");
116 NError(EINVAL).ThrowErr(env);
117 return nullptr;
118 }
119 return objWatcher;
120 }
121 } // namespace OHOS::FileManagement::ModuleFileIO
122