jihuayu commented on code in PR #1489:
URL: https://github.com/apache/kvrocks/pull/1489#discussion_r1238274447
##########
src/server/server.cc:
##########
@@ -1753,3 +1758,51 @@ std::list<std::pair<std::string, uint32_t>>
Server::GetSlaveHostAndPort() {
slave_threads_mu_.unlock();
return result;
}
+
+// The numeric cursor consists of a 16-bit counter, a 16-bit time stamp, a
29-bit hash,and a 3-bit cursor type. The
+// hash is used to prevent information leakage. The time_stamp is used to
prevent the generation of the same cursor in
+// the extremely short period before and after a restart.
+NumberCursor::NumberCursor(CursorType cursor_type, uint16_t counter, const
std::string &key_name) {
+ auto hash = static_cast<uint32_t>(std::hash<std::string>{}(key_name));
+ auto time_stamp = static_cast<uint16_t>(util::GetTimeStamp());
+ cursor_ = static_cast<uint64_t>(counter) | static_cast<uint64_t>(time_stamp)
<< 16 |
+ static_cast<uint64_t>(hash) << 32 |
static_cast<uint64_t>(cursor_type) << 61;
+}
+
+bool NumberCursor::IsMatch(const CursorDictElement &element, CursorType
cursor_type) const {
+ return cursor_ == element.cursor.cursor_ && cursor_type == getCursorType();
Review Comment:
We need to ensure that the `cursor` generated by the `SCAN` command can only
be used by the `SCAN` command and cannot be used by the `HSCAN` or `ZSCAN`
commands.
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