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 #ifndef ROSEN_SERVICE_DUMPER_H
17 #define ROSEN_SERVICE_DUMPER_H
18
19 #include <chrono>
20 #include <cstdio>
21 #include <fcntl.h>
22 #include <string>
23 #include <unistd.h>
24 #include <vector>
25
26 #include "ipc_types.h"
27 #include "iservice_registry.h"
28 #include "unique_fd.h"
29
30 namespace OHOS {
31 namespace Detail {
32 template <typename Duration>
33 using SysTime = std::chrono::time_point<std::chrono::system_clock, Duration>;
34 using SysMicroSeconds = SysTime<std::chrono::microseconds>;
35
MicroSecondsSinceEpoch()36 inline uint64_t MicroSecondsSinceEpoch()
37 {
38 SysMicroSeconds tmp = std::chrono::system_clock::now();
39 return tmp.time_since_epoch().count();
40 }
41
ToU16String(std::string s)42 inline std::u16string ToU16String(std::string s)
43 {
44 using Converter = std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>;
45 static Converter converter;
46 return converter.from_bytes(s);
47 }
48
49 class ServiceDumper {
50 public:
ServiceDumper(sptr<IRemoteObject> service,std::string serviceName,int timeOutMs)51 ServiceDumper(sptr<IRemoteObject> service, std::string serviceName, int timeOutMs)
52 : service_(std::move(service)), serviceName_(std::move(serviceName)), timeOutMs_(timeOutMs)
53 {
54 }
55
56 ~ServiceDumper() noexcept = default;
57
Run(int argc,char * argv[])58 int Run(int argc, char *argv[])
59 {
60 int status = 0;
61 int pipeFd[2];
62 if (pipe2(pipeFd, O_CLOEXEC | O_DIRECT) < 0 || pipeFd[0] < 0 || pipeFd[1] < 0) {
63 (void)fprintf(stderr, "Failed to create pipe: %s.\n", strerror(errno));
64 status = -errno;
65 return status;
66 }
67
68 readFd_ = UniqueFd(pipeFd[0]);
69
70 {
71 UniqueFd remoteFd(pipeFd[1]);
72 std::vector<std::u16string> args;
73 if (argc > 1) {
74 for (int i = 1; i < argc; ++i) {
75 args.push_back(ToU16String(argv[i]));
76 }
77 }
78
79 if (service_->Dump(remoteFd, args) != NO_ERROR) {
80 (void)fprintf(stderr, "Dump failed for %s.\n", serviceName_.c_str());
81 }
82 }
83
84 return ReadAndWriteDumpInfo();
85 }
86
87 private:
88 static constexpr int MICRO_SECS_PER_MILLI = 1000;
ReadAndWriteDumpInfo()89 int ReadAndWriteDumpInfo()
90 {
91 int status = 0;
92 auto start = MicroSecondsSinceEpoch() / MICRO_SECS_PER_MILLI;
93 auto end = start + timeOutMs_;
94
95 char buf[PIPE_BUF] = {0};
96 while (true) {
97 auto now = MicroSecondsSinceEpoch() / MICRO_SECS_PER_MILLI;
98 if (now >= end) {
99 break;
100 }
101
102 auto ret = TEMP_FAILURE_RETRY(read(readFd_, buf, sizeof(buf)-1));
103 buf[ret] = '\0';
104 if (ret == 0) {
105 // Reach to the EOF
106 break;
107 } else if (ret < 0) {
108 (void)fprintf(stderr, "Failed to read service's dump info: %s.\n", strerror(errno));
109 status = -errno;
110 break;
111 }
112
113 (void)fprintf(stdout, "%s", buf);
114 bzero(buf, sizeof(buf));
115 }
116
117 return status;
118 }
119
120 sptr<IRemoteObject> service_;
121 std::string serviceName_;
122 int timeOutMs_ = -1;
123 UniqueFd readFd_;
124 };
125 } // namespace Detail
126 } // namespace OHOS
127
128 #endif // ROSEN_SERVICE_DUMPER_H
129