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 "system_ability_wrapper.h"
17
18 #include <unistd.h>
19
20 #include "if_system_ability_manager.h"
21 #include "iservice_registry.h"
22 #include "system_ability_definition.h"
23 #include "system_ability_status_change_stub.h"
24
25 #include "asset_log.h"
26 #include "system_event_wrapper.h"
27
28 namespace {
29 const int32_t RETRY_TIMES_FOR_SAMGR = 50;
30 const int32_t RETRY_DURATION_US = 200 * 1000;
31
32 class SystemAbilityHandler : public OHOS::SystemAbilityStatusChangeStub {
33 public:
SystemAbilityHandler(const EventCallBack eventCallBack)34 explicit SystemAbilityHandler(const EventCallBack eventCallBack) : eventCallBack(eventCallBack) {};
35 ~SystemAbilityHandler() = default;
OnAddSystemAbility(int32_t systemAbilityId,const std::string & deviceId)36 void OnAddSystemAbility(int32_t systemAbilityId, const std::string &deviceId) override
37 {
38 if (systemAbilityId != OHOS::COMMON_EVENT_SERVICE_ID) {
39 return;
40 }
41
42 if (SubscribeSystemEvent(eventCallBack)) {
43 LOGI("Subscribe system event success.");
44 } else {
45 LOGE("Subscribe system event failed.");
46 }
47 }
OnRemoveSystemAbility(int32_t systemAbilityId,const std::string & deviceId)48 void OnRemoveSystemAbility(int32_t systemAbilityId, const std::string& deviceId) override
49 {
50 if (systemAbilityId != OHOS::COMMON_EVENT_SERVICE_ID) {
51 return;
52 }
53 if (UnSubscribeSystemEvent()) {
54 LOGI("UnSubscribe system event success.");
55 } else {
56 LOGE("UnSubscribe system event failed.");
57 }
58 }
59 private:
60 const EventCallBack eventCallBack;
61 };
62
GetSystemAbility(void)63 OHOS::sptr<OHOS::ISystemAbilityManager> GetSystemAbility(void)
64 {
65 int32_t retryCount = RETRY_TIMES_FOR_SAMGR;
66 OHOS::sptr<OHOS::ISystemAbilityManager> samgrProxy =
67 OHOS::SystemAbilityManagerClient::GetInstance().GetSystemAbilityManager();
68 while (samgrProxy == nullptr && retryCount > 0) {
69 usleep(RETRY_DURATION_US);
70 samgrProxy = OHOS::SystemAbilityManagerClient::GetInstance().GetSystemAbilityManager();
71 retryCount--;
72 }
73 return samgrProxy;
74 }
75
76 OHOS::sptr<SystemAbilityHandler> abilityHandler;
77 } // namespace
78
SubscribeSystemAbility(const EventCallBack eventCallBack)79 bool SubscribeSystemAbility(const EventCallBack eventCallBack)
80 {
81 OHOS::sptr<OHOS::ISystemAbilityManager> samgrProxy = GetSystemAbility();
82 if (samgrProxy == nullptr) {
83 LOGE("Get system ability failed");
84 return false;
85 }
86
87 abilityHandler = new (std::nothrow) SystemAbilityHandler(eventCallBack);
88 if (abilityHandler == nullptr) {
89 LOGE("Create system ability handler failed.");
90 return false;
91 }
92
93 int32_t ret = samgrProxy->SubscribeSystemAbility(OHOS::COMMON_EVENT_SERVICE_ID, abilityHandler);
94 if (ret != OHOS::ERR_OK) {
95 LOGE("Subscribe system ability failed.");
96 return false;
97 }
98 return true;
99 }
100
UnSubscribeSystemAbility()101 bool UnSubscribeSystemAbility()
102 {
103 OHOS::sptr<OHOS::ISystemAbilityManager> samgrProxy = GetSystemAbility();
104 if (samgrProxy == nullptr || abilityHandler == nullptr) {
105 return false;
106 }
107
108 if (samgrProxy->UnSubscribeSystemAbility(OHOS::COMMON_EVENT_SERVICE_ID, abilityHandler) != OHOS::ERR_OK ||
109 !UnSubscribeSystemEvent()) {
110 LOGE("UnSubscribe system ability or system event failed.");
111 return false;
112 }
113
114 return true;
115 }