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#include "MySQLGtid.h"
#include <boost/algorithm/string.hpp>
#include <IO/ReadHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
void GTIDSet::tryMerge(size_t i)
{
if ((i + 1) >= intervals.size())
return;
if (intervals[i].end != intervals[i + 1].start)
return;
intervals[i].end = intervals[i + 1].end;
intervals.erase(intervals.begin() + i + 1, intervals.begin() + i + 1 + 1);
}
void GTIDSets::parse(String gtid_format)
{
if (gtid_format.empty())
{
return;
}
std::vector<String> gtid_sets;
boost::split(gtid_sets, gtid_format, [](char c) { return c == ','; });
for (const auto & gs : gtid_sets)
{
auto gset = boost::trim_copy(gs);
std::vector<String> server_ids;
boost::split(server_ids, gset, [](char c) { return c == ':'; });
GTIDSet set;
set.uuid = DB::parse<UUID>(server_ids[0]);
for (size_t k = 1; k < server_ids.size(); ++k)
{
std::vector<String> inters;
boost::split(inters, server_ids[k], [](char c) { return c == '-'; });
GTIDSet::Interval val;
switch (inters.size())
{
case 1: {
val.start = std::stol(inters[0]);
val.end = val.start + 1;
break;
}
case 2: {
val.start = std::stol(inters[0]);
val.end = std::stol(inters[1]) + 1;
break;
}
default:
throw Exception(ErrorCodes::LOGICAL_ERROR, "GTIDParse: Invalid GTID interval: {}", server_ids[k]);
}
set.intervals.emplace_back(val);
}
sets.emplace_back(set);
}
}
void GTIDSets::update(const GTID & other)
{
for (GTIDSet & set : sets)
{
if (set.uuid == other.uuid)
{
for (auto i = 0U; i < set.intervals.size(); ++i)
{
auto & current = set.intervals[i];
/// Already Contained.
if (other.seq_no >= current.start && other.seq_no < current.end)
{
throw Exception(ErrorCodes::LOGICAL_ERROR, "GTIDSets updates other: {} invalid successor to {}",
std::to_string(other.seq_no), std::to_string(current.end));
}
/// Try to shrink Sequence interval.
GTIDSet::tryShrink(set, i, current);
/// Sequence, extend the interval.
if (other.seq_no == current.end)
{
set.intervals[i].end = other.seq_no + 1;
set.tryMerge(i);
return;
}
}
/// Add new interval.
GTIDSet::Interval new_interval{other.seq_no, other.seq_no + 1};
for (auto it = set.intervals.begin(); it != set.intervals.end(); ++it)
{
if (other.seq_no < (*it).start)
{
set.intervals.insert(it, new_interval);
return;
}
}
set.intervals.emplace_back(new_interval);
return;
}
}
GTIDSet set;
GTIDSet::Interval interval{other.seq_no, other.seq_no + 1};
set.uuid = other.uuid;
set.intervals.emplace_back(interval);
sets.emplace_back(set);
}
void GTIDSet::tryShrink(GTIDSet & set, unsigned int i, GTIDSet::Interval & current)
{
if (i != set.intervals.size() -1)
{
auto & next = set.intervals[i+1];
if (current.end == next.start)
set.tryMerge(i);
}
}
String GTIDSets::toString() const
{
WriteBufferFromOwnString buffer;
for (size_t i = 0; i < sets.size(); ++i)
{
GTIDSet set = sets[i];
writeUUIDText(set.uuid, buffer);
for (const auto & interval : set.intervals)
{
buffer.write(':');
auto start = interval.start;
auto end = interval.end;
if (end == (start + 1))
{
writeString(std::to_string(start), buffer);
}
else
{
writeString(std::to_string(start), buffer);
buffer.write('-');
writeString(std::to_string(end - 1), buffer);
}
}
if (i < (sets.size() - 1))
{
buffer.write(',');
}
}
return buffer.str();
}
String GTIDSets::toPayload() const
{
WriteBufferFromOwnString buffer;
UInt64 sets_size = sets.size();
buffer.write(reinterpret_cast<const char *>(&sets_size), 8);
for (const auto & set : sets)
{
// MySQL UUID is big-endian.
writeBinaryBigEndian(UUIDHelpers::getHighBytes(set.uuid), buffer);
writeBinaryBigEndian(UUIDHelpers::getLowBytes(set.uuid), buffer);
UInt64 intervals_size = set.intervals.size();
buffer.write(reinterpret_cast<const char *>(&intervals_size), 8);
for (const auto & interval : set.intervals)
{
buffer.write(reinterpret_cast<const char *>(&interval.start), 8);
buffer.write(reinterpret_cast<const char *>(&interval.end), 8);
}
}
return buffer.str();
}
}
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