1 /*
2 * Copyright (C) 2020 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 "daemon/logging.h"
18
19 #include <mutex>
20 #include <optional>
21 #include <string_view>
22
23 #include <android-base/no_destructor.h>
24 #include <android-base/properties.h>
25 #include <android-base/strings.h>
26 #include <android-base/thread_annotations.h>
27
28 #if defined(__ANDROID__)
29 struct LogStatus {
30 bool enabled[static_cast<size_t>(adb::LogType::COUNT)];
31
operator []LogStatus32 bool& operator[](adb::LogType type) { return enabled[static_cast<size_t>(type)]; }
33 };
34
35 using android::base::CachedProperty;
36 using android::base::NoDestructor;
37
38 static NoDestructor<std::mutex> log_mutex;
39 static NoDestructor<CachedProperty> log_property GUARDED_BY(log_mutex)("debug.adbd.logging");
40 static std::optional<LogStatus> cached_log_status GUARDED_BY(log_mutex);
41
42 static NoDestructor<CachedProperty> persist_log_property
43 GUARDED_BY(log_mutex)("persist.debug.adbd.logging");
44 static std::optional<LogStatus> cached_persist_log_status GUARDED_BY(log_mutex);
45
ParseLogStatus(std::string_view str)46 static LogStatus ParseLogStatus(std::string_view str) {
47 LogStatus result = {};
48 for (const auto& part : android::base::Split(std::string(str), ",")) {
49 if (part == "cnxn") {
50 result[adb::LogType::Connection] = true;
51 } else if (part == "service") {
52 result[adb::LogType::Service] = true;
53 } else if (part == "shell") {
54 result[adb::LogType::Shell] = true;
55 } else if (part == "all") {
56 result[adb::LogType::Connection] = true;
57 result[adb::LogType::Service] = true;
58 result[adb::LogType::Shell] = true;
59 }
60 }
61 return result;
62 }
63
GetLogStatus(android::base::CachedProperty * property,std::optional<LogStatus> * cached_status)64 static LogStatus GetLogStatus(android::base::CachedProperty* property,
65 std::optional<LogStatus>* cached_status) REQUIRES(log_mutex) {
66 bool changed;
67 const char* value = property->Get(&changed);
68 if (changed || !*cached_status) {
69 **cached_status = ParseLogStatus(value);
70 }
71 return **cached_status;
72 }
73
74 namespace adb {
is_logging_enabled(LogType type)75 bool is_logging_enabled(LogType type) {
76 std::lock_guard<std::mutex> lock(*log_mutex);
77 return GetLogStatus(log_property.get(), &cached_log_status)[type] ||
78 GetLogStatus(persist_log_property.get(), &cached_persist_log_status)[type];
79 }
80 } // namespace adb
81
82 #else
83
84 namespace adb {
is_logging_enabled(LogType type)85 bool is_logging_enabled(LogType type) {
86 return false;
87 }
88 } // namespace adb
89 #endif
90