1 /*
2 * Copyright (c) 2023 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 "file_utils.h"
25 #include "filemgmt_libhilog.h"
26 #include "../class_watcher/watcher_entity.h"
27 #include "../class_watcher/watcher_n_exporter.h"
28 namespace OHOS::FileManagement::ModuleFileIO {
29 using namespace std;
30 using namespace OHOS::FileManagement::LibN;
31
CreateAndCheckForWatcherEntity(napi_env env)32 static tuple<napi_value, int32_t> CreateAndCheckForWatcherEntity(napi_env env)
33 {
34 if (FileWatcher::GetInstance().GetNotifyId() < 0 && !FileWatcher::GetInstance().InitNotify()) {
35 HILOGE("Failed to get notifyId or initnotify fail");
36 return {nullptr, errno};
37 }
38 napi_value objWatcher = NClass::InstantiateClass(env, WatcherNExporter::className_, {});
39 if (!objWatcher) {
40 HILOGE("Failed to instantiate watcher");
41 return {nullptr, EIO};
42 }
43 return {objWatcher, ERRNO_NOERR};
44 }
45
ParseParam(const napi_env & env,const napi_callback_info & info,int32_t & errCode)46 shared_ptr<WatcherInfoArg> ParseParam(const napi_env &env, const napi_callback_info &info, int32_t &errCode)
47 {
48 NFuncArg funcArg(env, info);
49 if (!funcArg.InitArgs(NARG_CNT::THREE)) {
50 HILOGE("Failed to get param.");
51 errCode = EINVAL;
52 return nullptr;
53 }
54
55 auto [succGetPath, filename, unused] = NVal(env, funcArg[NARG_POS::FIRST]).ToUTF8StringPath();
56 if (!succGetPath) {
57 HILOGE("Failed to get watcher path.");
58 errCode = EINVAL;
59 return nullptr;
60 }
61
62 auto [succGetEvent, events] = NVal(env, funcArg[NARG_POS::SECOND]).ToInt32();
63 if (!succGetEvent || events <= 0 || !FileWatcher::GetInstance().CheckEventValid(events)) {
64 HILOGE("Failed to get watcher event.");
65 errCode = EINVAL;
66 return nullptr;
67 }
68
69 if (!NVal(env, funcArg[NARG_POS::THIRD]).TypeIs(napi_function)) {
70 HILOGE("Failed to get callback");
71 errCode = EINVAL;
72 return nullptr;
73 }
74 auto infoArg = CreateSharedPtr<WatcherInfoArg>(NVal(env, funcArg[NARG_POS::THIRD]));
75 if (infoArg == nullptr) {
76 HILOGE("Failed to request heap memory.");
77 errCode = ENOMEM;
78 return nullptr;
79 }
80 infoArg->events = static_cast<uint32_t>(events);
81 infoArg->env = env;
82 infoArg->fileName = string(filename.get());
83
84 return infoArg;
85 }
86
CreateWatcher(napi_env env,napi_callback_info info)87 napi_value Watcher::CreateWatcher(napi_env env, napi_callback_info info)
88 {
89 int errCode = 0;
90 auto infoArg = ParseParam(env, info, errCode);
91 if (errCode != 0) {
92 HILOGE("Failed to parse param");
93 NError(errCode).ThrowErr(env);
94 return nullptr;
95 }
96
97 auto [objWatcher, err] = CreateAndCheckForWatcherEntity(env);
98 if (!objWatcher) {
99 HILOGE("Failed to create watcher entity.");
100 NError(err).ThrowErr(env);
101 return nullptr;
102 }
103
104 auto watcherEntity = NClass::GetEntityOf<WatcherEntity>(env, objWatcher);
105 if (!watcherEntity) {
106 HILOGE("Failed to get WatcherEntity.");
107 NError(EIO).ThrowErr(env);
108 return nullptr;
109 }
110 watcherEntity->data_ = infoArg;
111
112 bool ret = FileWatcher::GetInstance().AddWatcherInfo(infoArg->fileName, infoArg);
113 if (!ret) {
114 HILOGE("Failed to add watcher info.");
115 NError(EINVAL).ThrowErr(env);
116 return nullptr;
117 }
118 return objWatcher;
119 }
120 } // namespace OHOS::FileManagement::ModuleFileIO
121