diff options
Diffstat (limited to 'src/ClockTAI.cpp')
| -rw-r--r-- | src/ClockTAI.cpp | 134 |
1 files changed, 2 insertions, 132 deletions
diff --git a/src/ClockTAI.cpp b/src/ClockTAI.cpp index 6d05370..7d2bd81 100644 --- a/src/ClockTAI.cpp +++ b/src/ClockTAI.cpp @@ -25,9 +25,8 @@ along with ODR-DabMux. If not, see <http://www.gnu.org/licenses/>. */ -/* This file downloads the TAI-UTC bulletins from the USNO servers and/or - * from IETF and parses them so that correct time can be communicated in EDI - * timestamps. +/* This file downloads the TAI-UTC bulletins from the from IETF and parses them + * so that correct time can be communicated in EDI timestamps. * * This file contains self-test code that can be executed by running * g++ -g -Wall -DTEST -DHAVE_CURL -std=c++11 -lcurl -lboost_regex -pthread \ @@ -66,16 +65,6 @@ static const char* tai_ietf_url = // and in the tz distribution static const char* tai_tz_url = "https://raw.githubusercontent.com/eggert/tz/master/leap-seconds.list"; -// leap-seconds.list has a different format from the USNO one - -static const char* tai_usno_url1 = - "http://maia.usno.navy.mil/ser7/tai-utc.dat"; -static const char* tai_usno_url2 = - "http://toshi.nofs.navy.mil/ser7/tai-utc.dat"; -/* Last two lines from USNO bulletin, example: - 2015 JUL 1 =JD 2457204.5 TAI-UTC= 36.0 S + (MJD - 41317.) X 0.0 S - 2017 JAN 1 =JD 2457754.5 TAI-UTC= 37.0 S + (MJD - 41317.) X 0.0 - */ int ClockTAI::download_offset_task() { @@ -112,34 +101,6 @@ int ClockTAI::download_offset_task() } } - if (not offset_valid) { - try { - download_tai_utc_bulletin(tai_usno_url1); - offset = parse_usno_bulletin(); - offset_valid = true; - } - catch (std::runtime_error& e) - { - etiLog.level(warn) << - "TAI-UTC offset from USNO server #1 could not be retrieved: " << - e.what(); - } - } - - if (not offset_valid) { - try { - download_tai_utc_bulletin(tai_usno_url2); - offset = parse_usno_bulletin(); - offset_valid = true; - } - catch (std::runtime_error& e) - { - etiLog.level(warn) << - "TAI-UTC offset from USNO server #2 could not be retrieved: " << - e.what(); - } - } - if (offset_valid) { // With the current evolution of the offset, we're probably going // to reach 500 long after DAB gets replaced by another standard. @@ -311,97 +272,6 @@ int ClockTAI::parse_ietf_bulletin() return tai_utc_offset; } -int ClockTAI::parse_usno_bulletin() -{ - boost::regex regex_bulletin( - "([0-9]{4}) ([A-Z]{3}) +([0-9]+) =JD +[0-9.]+ +TAI-UTC= *([0-9.]+)"); - /* regex groups: - * Year Month Day Julian date Offset - */ - - const std::array<std::string, 12> months{"JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"}; - - /* I'm not certain about the format they would use if the day is a - * two-digit number. Will they keep two spaces after the month? The regex - * should be resilient enough in that case. - */ - - time_t now = time(nullptr); - struct tm *utc_time_now = gmtime(&now); - - const int year = utc_time_now->tm_year + 1900; - const int month = utc_time_now->tm_mon; // January is 0 - if (month < 0 or month > 11) { - throw std::runtime_error("Invalid value for month"); - } - const int day = utc_time_now->tm_mday; - - - int tai_utc_offset = 0; - bool tai_utc_offset_valid = false; - - /* We cannot just take the last line, because it might - * be in the future, announcing an upcoming leap second. - * - * So we need to look at the current date, and compare it - * with the date of the leap second. - */ - for (std::string line; std::getline(m_bulletin, line); ) { - - boost::smatch bulletin_entry; - - bool is_match = boost::regex_search(line, bulletin_entry, regex_bulletin); - if (is_match) { - - if (bulletin_entry.size() != 5) { - throw std::runtime_error( - "Incorrect number of matched USNO TAI bulletin entries"); - } - const std::string bulletin_year(bulletin_entry[1]); - const std::string bulletin_month_name(bulletin_entry[2]); - const std::string bulletin_day(bulletin_entry[3]); - const std::string bulletin_offset(bulletin_entry[4]); - - const auto match = std::find(months.begin(), months.end(), bulletin_month_name); - if (match == months.end()) { - std::stringstream s; - s << "Month " << bulletin_month_name << " not in array!"; - std::runtime_error(s.str()); - } - - if ( (std::atoi(bulletin_year.c_str()) < year) or - - (std::atoi(bulletin_year.c_str()) == year and - std::distance(months.begin(), match) < month) or - - (std::atoi(bulletin_year.c_str()) == year and - std::distance(months.begin(), match) == month and - std::atoi(bulletin_day.c_str()) < day) ) { - tai_utc_offset = std::atoi(bulletin_offset.c_str()); - tai_utc_offset_valid = true; - } -#if TEST - else { - std::cerr << "Ignoring offset " << bulletin_offset << " at date " - << bulletin_year << " " << bulletin_month_name << " " << - bulletin_day << " in the future" << std::endl; - } -#endif - } -#if TEST - else { - std::cerr << "No match for line " << line << std::endl; - } -#endif - } - - if (not tai_utc_offset_valid) { - throw std::runtime_error("No data in TAI bulletin"); - } - - return tai_utc_offset; -} - size_t ClockTAI::fill_bulletin(char *ptr, size_t size, size_t nmemb) { size_t len = size * nmemb; |