PragmaTwice commented on code in PR #2472:
URL: https://github.com/apache/kvrocks/pull/2472#discussion_r1708528340
##########
src/commands/cmd_server.cc:
##########
@@ -1265,6 +1265,64 @@ class CommandDump : public Commander {
}
};
+class CommandPollUpdates : public Commander {
+ public:
+ Status Parse(const std::vector<std::string> &args) override {
+ CommandParser parser(args, 1);
+ sequence_ = GET_OR_RET(parser.TakeInt<uint64_t>());
+
+ while (parser.Good()) {
+ if (parser.EatEqICase("MAX")) {
+ max_ = GET_OR_RET(parser.TakeInt<int64_t>(NumericRange<int64_t>{1,
1000}));
+ } else if (parser.EatEqICase("STRICT")) {
+ is_strict_ = true;
+ } else if (parser.EatEqICase("FORMAT")) {
+ auto format = GET_OR_RET(parser.TakeStr());
+ if (util::EqualICase(format, "RAW")) {
+ format_ = Format::Raw;
+ } else {
+ return {Status::RedisParseErr, "invalid FORMAT option, only support
RAW"};
+ }
+ } else {
+ return {Status::RedisParseErr, errInvalidSyntax};
+ }
+ }
+ return Status::OK();
+ }
+
+ Status Execute(Server *srv, Connection *conn, std::string *output) override {
+ // sequence + 1 is for excluding the current sequence to avoid getting
duplicate updates
+ auto batches = GET_OR_RET(srv->PollUpdates(sequence_ + 1, max_,
is_strict_));
+
+ *output = redis::MultiLen(8);
+ *output += redis::BulkString("latest_sequence");
+ *output += redis::Integer(srv->storage->LatestSeqNumber());
+ *output += redis::BulkString("format");
+ *output += redis::BulkString("RAW");
+ *output += redis::BulkString("updates");
+ *output += redis::MultiLen(batches.size());
+ uint64_t next_sequence = sequence_;
+ for (const auto &batch : batches) {
+ *output +=
redis::BulkString(util::StringToHex(batch.writeBatchPtr->Data()));
+ // It might contain more than one sequence in a batch
+ next_sequence = batch.sequence + batch.writeBatchPtr->Count() - 1;
+ }
+ *output += redis::BulkString("next_sequence");
+ *output += redis::Integer(next_sequence);
Review Comment:
yeah
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