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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-01-07 14:41:00 +0100
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-01-07 14:41:00 +0100
commitdb9a7df50a39474019568187e4fb5c4321bebc3f (patch)
treef485834143afdeb4e49e17cf7a4921b521f84724 /src
parentccdad6a4eded99b17fef6f60c3e1a5284dce74e3 (diff)
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ClockTAI: refactor downloading slightly
Diffstat (limited to 'src')
-rw-r--r--src/ClockTAI.cpp137
1 files changed, 74 insertions, 63 deletions
diff --git a/src/ClockTAI.cpp b/src/ClockTAI.cpp
index 787eb4d..00a9aeb 100644
--- a/src/ClockTAI.cpp
+++ b/src/ClockTAI.cpp
@@ -78,54 +78,6 @@ static array<const char*, 2> default_tai_urls = {
// /var/tmp "must not be deleted when the system is booted."
static const char *tai_cache_location = "/var/tmp/odr-dabmux-leap-seconds.cache";
-struct bulletin_state {
- bool valid = false;
- int64_t expiry = 0;
-
- bool usable() const { return valid and expiry > 0; }
-};
-
-static bulletin_state parse_bulletin(const string& bulletin)
-{
- // The bulletin contains one line that specifies an expiration date
- // in NTP time. If that point in time is in the future, we consider
- // the bulletin valid.
- //
- // The entry looks like this:
- //#@ 3707596800
-
- bulletin_state ret;
-
- std::regex regex_expiration(R"(#@\s+([0-9]+))");
-
- time_t now = time(nullptr);
-
- stringstream ss(bulletin);
-
- for (string line; getline(ss, line); ) {
- std::smatch bulletin_entry;
-
- bool is_match = std::regex_search(line, bulletin_entry, regex_expiration);
- if (is_match) {
- if (bulletin_entry.size() != 2) {
- throw runtime_error(
- "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;
-
-#ifdef TEST
- etiLog.level(info) << "Bulletin expires in " << expiry_unix - now;
-#endif
- ret.expiry = expiry_unix - now;
- ret.valid = true;
- break;
- }
- }
- return ret;
-}
-
// read TAI offset from a valid bulletin in IETF format
static int parse_ietf_bulletin(const std::string& bulletin)
{
@@ -193,6 +145,62 @@ static int parse_ietf_bulletin(const std::string& bulletin)
}
+struct bulletin_state {
+ bool valid = false;
+ int64_t expiry = 0;
+ int offset = 0;
+
+ bool usable() const { return valid and expiry > 0; }
+};
+
+static bulletin_state parse_bulletin(const string& bulletin)
+{
+ // The bulletin contains one line that specifies an expiration date
+ // in NTP time. If that point in time is in the future, we consider
+ // the bulletin valid.
+ //
+ // The entry looks like this:
+ //#@ 3707596800
+
+ bulletin_state ret;
+
+ std::regex regex_expiration(R"(#@\s+([0-9]+))");
+
+ time_t now = time(nullptr);
+
+ stringstream ss(bulletin);
+
+ for (string line; getline(ss, line); ) {
+ std::smatch bulletin_entry;
+
+ bool is_match = std::regex_search(line, bulletin_entry, regex_expiration);
+ if (is_match) {
+ if (bulletin_entry.size() != 2) {
+ throw runtime_error(
+ "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;
+
+#ifdef TEST
+ etiLog.level(info) << "Bulletin expires in " << expiry_unix - now;
+#endif
+ ret.expiry = expiry_unix - now;
+ try {
+ ret.offset = parse_ietf_bulletin(bulletin);
+ ret.valid = true;
+ }
+ catch (const runtime_error& e) {
+ etiLog.level(warn) << "Bulletin expiry ok but parse error: " << e.what();
+ }
+ break;
+ }
+ }
+ return ret;
+}
+
+
// callback that receives data from cURL
static size_t fill_bulletin(char *ptr, size_t size, size_t nmemb, void *ctx)
{
@@ -279,22 +287,25 @@ int ClockTAI::get_valid_offset()
std::unique_lock<std::mutex> lock(m_data_mutex);
- if (parse_bulletin(m_bulletin).usable()) {
+ const auto state = parse_bulletin(m_bulletin);
+ if (state.usable()) {
#if TEST
etiLog.level(info) << "Bulletin already valid";
#endif
- offset = parse_ietf_bulletin(m_bulletin);
+ offset = state.offset;
offset_valid = true;
}
else {
const auto cache_bulletin = load_bulletin_from_file(tai_cache_location);
- if (parse_bulletin(cache_bulletin).usable()) {
+ const auto cache_state = parse_bulletin(cache_bulletin);
+
+ if (cache_state.usable()) {
m_bulletin = cache_bulletin;
+ offset = cache_state.offset;
+ offset_valid = true;
#if TEST
- etiLog.level(info) << "Bulletin from cache valid";
+ etiLog.level(info) << "Bulletin from cache valid with offset=" << offset;
#endif
- offset = parse_ietf_bulletin(m_bulletin);
- offset_valid = true;
}
else {
for (const auto url : m_bulletin_urls) {
@@ -303,9 +314,10 @@ int ClockTAI::get_valid_offset()
etiLog.level(info) << "Load bulletin from " << url;
#endif
const auto new_bulletin = download_tai_utc_bulletin(url.c_str());
- if (parse_bulletin(new_bulletin).usable()) {
+ const auto new_state = parse_bulletin(new_bulletin);
+ if (new_state.usable()) {
m_bulletin = new_bulletin;
- offset = parse_ietf_bulletin(m_bulletin);
+ offset = new_state.offset;
offset_valid = true;
etiLog.level(debug) << "Loaded valid TAI Bulletin from " <<
@@ -343,8 +355,6 @@ int ClockTAI::get_valid_offset()
}
else {
// Try again later
- m_bulletin_download_time += chrono::hours(download_retry_interval_hours);
-
throw download_failed();
}
}
@@ -365,7 +375,7 @@ int ClockTAI::get_offset()
m_offset_valid = true;
// Simulate requiring a new download
- m_bulletin_download_time = system_clock::now() - hours(24 * 40);
+ m_bulletin_download_time = time_now - hours(24 * 40);
#else
// First time we run we must block until we know
// the offset
@@ -378,7 +388,7 @@ int ClockTAI::get_offset()
}
lock.lock();
m_offset_valid = true;
- m_bulletin_download_time = system_clock::now();
+ m_bulletin_download_time = time_now;
#endif
etiLog.level(info) <<
"Initialised TAI-UTC offset to " << m_offset << "s.";
@@ -396,7 +406,7 @@ int ClockTAI::get_offset()
try {
m_offset = m_offset_future.get();
m_offset_valid = true;
- m_bulletin_download_time = system_clock::now();
+ m_bulletin_download_time = time_now;
etiLog.level(info) <<
"Updated TAI-UTC offset to " << m_offset << "s.";
@@ -405,6 +415,8 @@ int ClockTAI::get_offset()
etiLog.level(warn) <<
"TAI-UTC download failed, will retry in " <<
download_retry_interval_hours << " hour(s)";
+
+ m_bulletin_download_time += hours(download_retry_interval_hours);
}
#ifdef TEST
wait_longer = false;
@@ -424,8 +436,7 @@ int ClockTAI::get_offset()
#ifdef TEST
etiLog.level(debug) << " Launch async";
#endif
- m_offset_future = async(launch::async,
- &ClockTAI::get_valid_offset, this);
+ m_offset_future = async(launch::async, &ClockTAI::get_valid_offset, this);
}
}