diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/ClockTAI.cpp | 55 | ||||
| -rw-r--r-- | lib/ClockTAI.h | 5 |
2 files changed, 38 insertions, 22 deletions
diff --git a/lib/ClockTAI.cpp b/lib/ClockTAI.cpp index 2656345..2d48d36 100644 --- a/lib/ClockTAI.cpp +++ b/lib/ClockTAI.cpp @@ -64,11 +64,13 @@ using namespace std; static bool wait_longer = true; #endif -constexpr int download_retry_interval_hours = 1; +constexpr int refresh_retry_interval_hours = 1; // Offset between NTP time and POSIX time: -// timestamp_unix = timestamp_ntp - ntp_unix_offset -const int64_t ntp_unix_offset = 2208988800L; +// timestamp_unix = timestamp_ntp - NTP_UNIX_OFFSET +constexpr int64_t NTP_UNIX_OFFSET = 2208988800L; + +constexpr int64_t MONTH = 3600 * 24 * 30; // leap seconds insertion bulletin is available from the IETF and in the TZ // distribution @@ -121,10 +123,9 @@ static int parse_ietf_bulletin(const std::string& bulletin) const string bulletin_ntp_timestamp(bulletin_entry[1]); const string bulletin_offset(bulletin_entry[2]); - const int64_t timestamp_unix = - std::atoll(bulletin_ntp_timestamp.c_str()) - ntp_unix_offset; + const int64_t timestamp_unix = std::stoll(bulletin_ntp_timestamp) - NTP_UNIX_OFFSET; - const int offset = std::atoi(bulletin_offset.c_str()); + const int offset = std::stoi(bulletin_offset.c_str()); // Ignore entries announcing leap seconds in the future if (timestamp_unix < now) { tai_utc_offset = offset; @@ -154,6 +155,7 @@ struct bulletin_state { int offset = 0; bool usable() const { return valid and expiry > 0; } + bool expires_soon() const { return usable() and expiry < 1 * MONTH; } }; static bulletin_state parse_bulletin(const string& bulletin) @@ -183,19 +185,24 @@ static bulletin_state parse_bulletin(const string& bulletin) "Incorrect number of matched TAI IETF bulletin expiration"); } const string expiry_data_str(bulletin_entry[1]); - const int64_t expiry_unix = - std::atoll(expiry_data_str.c_str()) - ntp_unix_offset; + try { + const int64_t expiry_unix = std::stoll(expiry_data_str) - NTP_UNIX_OFFSET; #ifdef TAI_TEST - etiLog.level(info) << "Bulletin expires in " << expiry_unix - now; + etiLog.level(info) << "Bulletin expires in " << expiry_unix - now; #endif - ret.expiry = expiry_unix - now; - try { + ret.expiry = expiry_unix - now; ret.offset = parse_ietf_bulletin(bulletin); ret.valid = true; } + catch (const invalid_argument& e) { + etiLog.level(warn) << "Could not parse bulletin: " << e.what(); + } + catch (const out_of_range&) { + etiLog.level(warn) << "Parse bulletin: conversion is out of range"; + } catch (const runtime_error& e) { - etiLog.level(warn) << "Bulletin expiry ok but parse error: " << e.what(); + etiLog.level(warn) << "Parse bulletin: " << e.what(); } break; } @@ -316,6 +323,7 @@ int ClockTAI::get_valid_offset() { int offset = 0; bool offset_valid = false; + bool refresh_m_bulletin = false; std::unique_lock<std::mutex> lock(m_data_mutex); @@ -326,8 +334,14 @@ int ClockTAI::get_valid_offset() #endif offset = state.offset; offset_valid = true; + + refresh_m_bulletin = state.expires_soon(); } else { + refresh_m_bulletin = true; + } + + if (refresh_m_bulletin) { const auto cache_bulletin = load_bulletin_from_file(tai_cache_location); #if TAI_TEST etiLog.level(info) << "Loaded cache bulletin with " << @@ -412,7 +426,7 @@ int ClockTAI::get_offset() m_offset_valid = true; // Simulate requiring a new download - m_bulletin_download_time = time_now - hours(24 * 40); + m_bulletin_refresh_time = time_now - hours(24 * 40); #else // First time we run we must block until we know // the offset @@ -425,15 +439,16 @@ int ClockTAI::get_offset() } lock.lock(); m_offset_valid = true; - m_bulletin_download_time = time_now; + m_bulletin_refresh_time = time_now; #endif etiLog.level(info) << "Initialised TAI-UTC offset to " << m_offset << "s."; } - if (time_now - m_bulletin_download_time > hours(24 * 31)) { - // Refresh if it's older than one month. Leap seconds are - // announced several months in advance + if (m_bulletin_refresh_time + hours(1) < time_now) { + // Once per hour, parse the bulletin again, and + // if necessary trigger a download. + // Leap seconds are announced several months in advance etiLog.level(debug) << "Trying to refresh TAI bulletin"; if (m_offset_future.valid()) { @@ -443,7 +458,7 @@ int ClockTAI::get_offset() try { m_offset = m_offset_future.get(); m_offset_valid = true; - m_bulletin_download_time = time_now; + m_bulletin_refresh_time = time_now; etiLog.level(info) << "Updated TAI-UTC offset to " << m_offset << "s."; @@ -451,9 +466,9 @@ int ClockTAI::get_offset() catch (const download_failed&) { etiLog.level(warn) << "TAI-UTC download failed, will retry in " << - download_retry_interval_hours << " hour(s)"; + refresh_retry_interval_hours << " hour(s)"; - m_bulletin_download_time += hours(download_retry_interval_hours); + m_bulletin_refresh_time += hours(refresh_retry_interval_hours); } #ifdef DOWNLOADED_IN_THE_PAST_TEST wait_longer = false; diff --git a/lib/ClockTAI.h b/lib/ClockTAI.h index 50a6323..743cf68 100644 --- a/lib/ClockTAI.h +++ b/lib/ClockTAI.h @@ -79,14 +79,15 @@ class ClockTAI : public RemoteControllable { // Protect all data members, as RC functions are in another thread mutable std::mutex m_data_mutex; - // The currently used TAI-UTC offset + // The currently used TAI-UTC offset, extracted from m_bulletin and cached here + // to avoid having to parse the bulletin all the time int m_offset = 0; int m_offset_valid = false; std::vector<std::string> m_bulletin_urls; std::string m_bulletin; - std::chrono::system_clock::time_point m_bulletin_download_time; + std::chrono::system_clock::time_point m_bulletin_refresh_time; // Update the cache file with the current m_bulletin void update_cache(const char* cache_filename); |