Christopher Wiley | 2971cf3 | 2015-10-23 11:50:21 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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 <fstream> |
| 18 | #include <iostream> |
| 19 | #include <string> |
| 20 | #include <vector> |
| 21 | |
| 22 | #include <errno.h> |
| 23 | #include <time.h> |
| 24 | #include <unistd.h> |
| 25 | |
| 26 | using std::cerr; |
| 27 | using std::cout; |
| 28 | using std::endl; |
| 29 | using std::getline; |
| 30 | using std::ifstream; |
| 31 | using std::string; |
| 32 | using std::vector; |
| 33 | |
| 34 | namespace { |
| 35 | |
| 36 | bool ReadLines(const string& input_file_path, vector<string>* lines) { |
| 37 | ifstream watched_file(input_file_path); |
| 38 | if (!watched_file.is_open()) { |
| 39 | cerr << "Unable to open input file: " << input_file_path << endl; |
| 40 | return false; |
| 41 | } |
| 42 | |
| 43 | string line; |
| 44 | while (getline(watched_file, line)) { |
| 45 | lines->push_back(line); |
| 46 | } |
| 47 | watched_file.close(); |
| 48 | return true; |
| 49 | } |
| 50 | |
| 51 | bool HasSentinel(const vector<string>& lines, const string& sentinel) { |
| 52 | for (const auto& line : lines) { |
| 53 | if (line.find(sentinel) != string::npos) { |
| 54 | return true; |
| 55 | } |
| 56 | } |
| 57 | return false; |
| 58 | } |
| 59 | |
| 60 | } // namespace |
| 61 | |
| 62 | int main(int argc, const char* argv[]) { |
| 63 | if (argc != 5) { |
| 64 | cerr << "Invalid usage." << endl; |
| 65 | cerr << argv[0] |
| 66 | << " <timeout in seconds>" |
| 67 | << " <input file path>" |
| 68 | << " <success sentinel>" |
| 69 | << " <failure sentinel>" << endl; |
| 70 | return -EINVAL; |
| 71 | } |
| 72 | const string timeout_as_str = argv[1]; |
| 73 | const string input_file_path = argv[2]; |
| 74 | const string success_sentinel = argv[3]; |
| 75 | const string failure_sentinel = argv[4]; |
| 76 | |
| 77 | const int timeout_seconds = atoi(timeout_as_str.c_str()); |
| 78 | if (timeout_seconds <= 0) { |
| 79 | cerr << "Invalid timeout value (in seconds): " << timeout_as_str << endl; |
| 80 | return -EINVAL; |
| 81 | } |
| 82 | |
| 83 | int exit_code = 1; |
| 84 | const time_t start_time = time(nullptr); |
| 85 | vector<string> lines; |
| 86 | while (true) { |
| 87 | sleep(1); |
| 88 | if (time(nullptr) - start_time > timeout_seconds) { |
| 89 | cerr << "Timed out waiting for success/failure sentinel." << endl; |
| 90 | break; |
| 91 | } |
| 92 | // Ignore errors when reading lines. The file may not immediately exist |
| 93 | // because it takes the Java process some time to create it. |
| 94 | lines.clear(); |
| 95 | ReadLines(input_file_path, &lines); |
| 96 | |
| 97 | if (HasSentinel(lines, success_sentinel)) { |
| 98 | exit_code = 0; |
| 99 | break; |
| 100 | } |
| 101 | if (HasSentinel(lines, failure_sentinel)) { |
| 102 | break; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | cout << "Found output:" << endl; |
| 107 | for (const auto& line : lines) { |
| 108 | cout << " " << line << endl; |
| 109 | } |
| 110 | return exit_code; |
| 111 | } |