1 /*
2 * Copyright (c) 2021, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "CarTelemetryInternalImpl.h"
18
19 #include <aidl/android/automotive/telemetry/internal/BnCarDataListener.h>
20 #include <aidl/android/automotive/telemetry/internal/CarDataInternal.h>
21 #include <aidl/android/automotive/telemetry/internal/ICarDataListener.h>
22 #include <android-base/logging.h>
23 #include <android-base/stringprintf.h>
24 #include <android-base/strings.h>
25
26 namespace android {
27 namespace automotive {
28 namespace telemetry {
29
30 using ::aidl::android::automotive::telemetry::internal::BnCarDataListener;
31 using ::aidl::android::automotive::telemetry::internal::CarDataInternal;
32 using ::aidl::android::automotive::telemetry::internal::ICarDataListener;
33 using ::android::base::StringPrintf;
34
CarTelemetryInternalImpl(TelemetryServer * server)35 CarTelemetryInternalImpl::CarTelemetryInternalImpl(TelemetryServer* server) :
36 mTelemetryServer(server),
37 mBinderDeathRecipient(
38 ::AIBinder_DeathRecipient_new(CarTelemetryInternalImpl::listenerBinderDied)) {}
39
setListener(const std::shared_ptr<ICarDataListener> & listener)40 ndk::ScopedAStatus CarTelemetryInternalImpl::setListener(
41 const std::shared_ptr<ICarDataListener>& listener) {
42 LOG(VERBOSE) << "Received a setListener call";
43 auto result = mTelemetryServer->setListener(listener);
44 if (!result.ok()) {
45 LOG(WARNING) << __func__ << ": " << result.error().message();
46 return ndk::ScopedAStatus::fromExceptionCodeWithMessage(result.error().code(),
47 result.error().message().c_str());
48 }
49
50 // If passed a local binder, AIBinder_linkToDeath will do nothing and return
51 // STATUS_INVALID_OPERATION. We ignore this case because we only use local binders in tests
52 // where this is not an error.
53 if (!listener->isRemote()) {
54 return ndk::ScopedAStatus::ok();
55 }
56
57 auto status = ndk::ScopedAStatus::fromStatus(
58 ::AIBinder_linkToDeath(listener->asBinder().get(), mBinderDeathRecipient.get(), this));
59 if (!status.isOk()) {
60 LOG(WARNING) << __func__ << ": Failed to linkToDeath: " << status.getMessage();
61 mTelemetryServer->clearListener();
62 return ndk::ScopedAStatus::fromExceptionCodeWithMessage(::EX_ILLEGAL_STATE,
63 status.getMessage());
64 }
65 return ndk::ScopedAStatus::ok();
66 }
67
clearListener()68 ndk::ScopedAStatus CarTelemetryInternalImpl::clearListener() {
69 auto listener = mTelemetryServer->getListener();
70 mTelemetryServer->clearListener();
71 if (listener == nullptr) {
72 return ndk::ScopedAStatus::ok();
73 }
74 auto status = ndk::ScopedAStatus::fromStatus(
75 ::AIBinder_unlinkToDeath(listener->asBinder().get(), mBinderDeathRecipient.get(),
76 this));
77 if (!status.isOk()) {
78 LOG(WARNING) << __func__
79 << ": unlinkToDeath failed, continuing anyway: " << status.getMessage();
80 }
81 return ndk::ScopedAStatus::ok();
82 }
83
dump(int fd,const char ** args,uint32_t numArgs)84 binder_status_t CarTelemetryInternalImpl::dump(int fd, const char** args, uint32_t numArgs) {
85 dprintf(fd, "ICarTelemetryInternal:\n");
86 mTelemetryServer->dump(fd);
87 return ::STATUS_OK;
88 }
89
90 // Removes the listener if its binder dies.
listenerBinderDiedImpl()91 void CarTelemetryInternalImpl::listenerBinderDiedImpl() {
92 LOG(WARNING) << "A ICarDataListener died, clearing the listener.";
93 mTelemetryServer->clearListener();
94 }
95
96 // static
listenerBinderDied(void * cookie)97 void CarTelemetryInternalImpl::listenerBinderDied(void* cookie) {
98 // We expect the pointer to be alive as there is only a single instance of
99 // CarTelemetryInternalImpl and if it dies, the whole process should die too.
100 auto thiz = static_cast<CarTelemetryInternalImpl*>(cookie);
101 thiz->listenerBinderDiedImpl();
102 }
103
104 } // namespace telemetry
105 } // namespace automotive
106 } // namespace android
107