1 /*
2 * Copyright (c) 2021 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 "log_print.h"
17
18 #include <atomic>
19 #include <cstdarg>
20 #include <cstdio>
21 #include <mutex>
22
23 #include "securec.h"
24 #include "platform_specific.h"
25 #include "hilog/log.h"
26
27 namespace DistributedDB {
28 Logger *Logger::logHandler = nullptr;
29 const std::string Logger::PRIVATE_TAG = "s{private}";
30
31 class HiLogger : public Logger {
32 public:
Print(Level level,const std::string & tag,const std::string & msg)33 void Print(Level level, const std::string &tag, const std::string &msg) override
34 {
35 if (msg.empty()) {
36 return;
37 }
38 const std::string format = "%{public}s";
39 OHOS::HiviewDFX::HiLogLabel label = { LOG_CORE, 0xD001630, tag.c_str() }; // log module id.
40 switch (level) {
41 case Level::LEVEL_DEBUG:
42 (void)OHOS::HiviewDFX::HiLog::Debug(label, format.c_str(), msg.c_str());
43 break;
44 case Level::LEVEL_INFO:
45 (void)OHOS::HiviewDFX::HiLog::Info(label, format.c_str(), msg.c_str());
46 break;
47 case Level::LEVEL_WARN:
48 (void)OHOS::HiviewDFX::HiLog::Warn(label, format.c_str(), msg.c_str());
49 break;
50 case Level::LEVEL_ERROR:
51 (void)OHOS::HiviewDFX::HiLog::Error(label, format.c_str(), msg.c_str());
52 break;
53 case Level::LEVEL_FATAL:
54 (void)OHOS::HiviewDFX::HiLog::Fatal(label, format.c_str(), msg.c_str());
55 break;
56 default:
57 break;
58 }
59 }
60 };
61
GetInstance()62 Logger *Logger::GetInstance()
63 {
64 static std::mutex logInstanceLock;
65 static std::atomic<Logger *> logInstance = nullptr;
66 // For Double-Checked Locking, we need check logInstance twice
67 if (logInstance == nullptr) {
68 std::lock_guard<std::mutex> lock(logInstanceLock);
69 if (logInstance == nullptr) {
70 // Here, we new logInstance to print log, if new failed, we can do nothing.
71 logInstance = new (std::nothrow) HiLogger;
72 }
73 }
74 return logInstance;
75 }
76
RegisterLogger(Logger * logger)77 void Logger::RegisterLogger(Logger *logger)
78 {
79 static std::mutex logHandlerLock;
80 if (logger == nullptr) {
81 return;
82 }
83 if (logHandler == nullptr) {
84 std::lock_guard<std::mutex> lock(logHandlerLock);
85 if (logHandler == nullptr) {
86 logHandler = logger;
87 }
88 }
89 }
90
Log(Level level,const std::string & tag,const char * func,int line,const char * format,...)91 void Logger::Log(Level level, const std::string &tag, const char *func, int line, const char *format, ...)
92 {
93 (void)func;
94 (void)line;
95 if (format == nullptr) {
96 return;
97 }
98
99 static const int maxLogLength = 1024;
100 va_list argList;
101 va_start(argList, format);
102 char logBuff[maxLogLength];
103 std::string msg;
104 std::string formatTemp;
105 PreparePrivateLog(format, formatTemp);
106 int bytes = vsnprintf_s(logBuff, maxLogLength, maxLogLength - 1, formatTemp.c_str(), argList);
107 if (bytes < 0) {
108 msg = "log buffer overflow!";
109 } else {
110 msg = logBuff;
111 }
112 va_end(argList);
113 if (logHandler != nullptr) {
114 logHandler->Print(level, tag, msg);
115 return;
116 }
117
118 Logger::RegisterLogger(Logger::GetInstance());
119 if (logHandler != nullptr) {
120 logHandler->Print(level, tag, msg);
121 }
122 }
123
PreparePrivateLog(const char * format,std::string & outStrFormat)124 void Logger::PreparePrivateLog(const char *format, std::string &outStrFormat)
125 {
126 outStrFormat = format;
127 std::string::size_type pos = outStrFormat.find(PRIVATE_TAG);
128 if (pos != std::string::npos) {
129 outStrFormat.replace(pos, PRIVATE_TAG.size(), ".3s");
130 }
131 }
132 } // namespace DistributedDB
133