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Silently truncate zero bytes at the end of encrypted binlog.

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GitOrigin-RevId: 88a18a4aaf3cbfa5907ce7b50d82f871836d6281
This commit is contained in:
levlam 2019-03-11 17:56:03 +03:00
parent 2a8b6abebc
commit 99ba887334
1 changed files with 24 additions and 0 deletions
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24
tddb/td/db/binlog/Binlog.cpp
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@ -306,6 +306,7 @@ Status Binlog::close_and_destroy() {
destroy(path).ignore();
return close_status;
}
Status Binlog::destroy(Slice path) {
unlink(PSLICE() << path).ignore();
unlink(PSLICE() << path << ".new").ignore();
@ -385,7 +386,12 @@ void Binlog::do_event(BinlogEvent &&event) {
if (state_ == State::Load) {
fd_.seek(fd_size_).ensure();
fd_.truncate_to_current_position(fd_size_).ensure();
if (data.empty()) {
return;
}
}
LOG(FATAL) << "Truncate binlog \"" << path_ << "\" from size " << old_size << " to size " << fd_size_
<< " in state " << static_cast<int32>(state_) << " due to error: " << status << " after reading "
<< data;
@ -499,6 +505,9 @@ Status Binlog::load_binlog(const Callback &callback, const Callback &debug_callb
auto data = debug_get_binlog_data(offset, old_size);
fd_.seek(offset).ensure();
fd_.truncate_to_current_position(offset).ensure();
if (data.empty()) {
break;
}
LOG(FATAL) << "Truncate binlog \"" << path_ << "\" from size " << old_size << " to size " << offset
<< " due to error: " << r_need_size.error() << " after reading " << data;
}
@ -698,11 +707,26 @@ string Binlog::debug_get_binlog_data(int64 begin_offset, int64 end_offset) {
if (r_data_size.is_error()) {
return PSTRING() << "Failed to read binlog: " << r_data_size.error();
}
if (r_data_size.ok() < expected_data_length) {
data.resize(r_data_size.ok());
data = PSTRING() << format::as_hex_dump<4>(Slice(data)) << " | with " << expected_data_length - r_data_size.ok()
<< " missed bytes";
} else {
if (encryption_type_ == EncryptionType::AesCtr) {
bool is_zero = true;
for (auto &c : data) {
if (c != '\0') {
is_zero = false;
}
}
// very often we have '\0' bytes written to disk instead of a real log event
// this is clearly impossible content for a real encrypted log event, so just ignore it
if (is_zero) {
return string();
}
}
data = PSTRING() << format::as_hex_dump<4>(Slice(data));
}
return data;