1 /*
2 * Copyright (c) 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_core.h"
17
18 #include <cstring>
19 #include <fcntl.h>
20 #include <tuple>
21
22 #include "file_utils.h"
23 #include "filemgmt_libhilog.h"
24 #include "fs_file_watcher.h"
25
26 namespace OHOS::FileManagement::ModuleFileIO {
27 using namespace std;
28
InstantiateWatcher()29 static FsResult<FsWatcher *> InstantiateWatcher()
30 {
31 if (FsFileWatcher::GetInstance().GetNotifyId() < 0 && !FsFileWatcher::GetInstance().InitNotify()) {
32 HILOGE("Failed to get notifyId or initnotify fail");
33 return FsResult<FsWatcher *>::Error(errno);
34 }
35
36 FsResult<FsWatcher *> result = FsWatcher::Constructor();
37 if (!result.IsSuccess()) {
38 HILOGE("Failed to instantiate watcher");
39 return FsResult<FsWatcher *>::Error(EIO);
40 }
41 return result;
42 }
43
ToWatcherInfo(const string & path,const int32_t events,shared_ptr<IWatcherCallback> callback,int32_t & errCode)44 shared_ptr<WatcherInfo> ToWatcherInfo(
45 const string &path, const int32_t events, shared_ptr<IWatcherCallback> callback, int32_t &errCode)
46 {
47 if (events <= 0 || !FsFileWatcher::GetInstance().CheckEventValid(events)) {
48 HILOGE("Failed to get watcher event.");
49 errCode = EINVAL;
50 return nullptr;
51 }
52
53 if (!callback) {
54 HILOGE("Failed to get callback");
55 errCode = EINVAL;
56 return nullptr;
57 }
58
59 auto info = CreateSharedPtr<WatcherInfo>(callback);
60 if (info == nullptr) {
61 HILOGE("Failed to request heap memory.");
62 errCode = ENOMEM;
63 return nullptr;
64 }
65
66 info->events = static_cast<uint32_t>(events);
67 info->fileName = move(path);
68 return info;
69 }
70
DoCreateWatcher(const string & path,const int32_t events,shared_ptr<IWatcherCallback> callback)71 FsResult<FsWatcher *> WatcherCore::DoCreateWatcher(
72 const string &path, const int32_t events, shared_ptr<IWatcherCallback> callback)
73 {
74 int errCode = 0;
75 auto info = ToWatcherInfo(path, events, callback, errCode);
76 if (errCode != 0) {
77 HILOGE("Failed to parse param");
78 return FsResult<FsWatcher *>::Error(errCode);
79 }
80
81 auto result = InstantiateWatcher();
82 if (!result.IsSuccess()) {
83 return result;
84 }
85
86 const FsWatcher *objWatcher = result.GetData().value();
87 if (!objWatcher) {
88 HILOGE("Failed to get fsWatcher");
89 return FsResult<FsWatcher *>::Error(EIO);
90 }
91
92 auto *watchEntity = objWatcher->GetWatchEntity();
93 if (!watchEntity) {
94 HILOGE("Failed to get watchEntity.");
95 delete objWatcher;
96 objWatcher = nullptr;
97 return FsResult<FsWatcher *>::Error(EIO);
98 }
99
100 watchEntity->data_ = info;
101
102 bool ret = FsFileWatcher::GetInstance().AddWatcherInfo(info);
103 if (!ret) {
104 HILOGE("Failed to add watcher info.");
105 return FsResult<FsWatcher *>::Error(EINVAL);
106 }
107 return result;
108 }
109 } // namespace OHOS::FileManagement::ModuleFileIO
110