From cb0c2642f872874a74ea239930fea49795926267 Mon Sep 17 00:00:00 2001
From: Green Sky <green@g-s.xyz>
Date: Tue, 20 Dec 2022 02:23:54 +0100
Subject: [PATCH] works, somewhat

---
 vim_research/test2.cpp | 105 ++++++++++++++++++++++++++++++-----------
 1 file changed, 77 insertions(+), 28 deletions(-)

diff --git a/vim_research/test2.cpp b/vim_research/test2.cpp
index 7116016..35422bd 100644
--- a/vim_research/test2.cpp
+++ b/vim_research/test2.cpp
@@ -484,7 +484,44 @@ void toxThread(SharedContext* ctx) {
 				std::cout << "tox connected to group\n";
 			}
 		} else { // do the thing
-			// pump from buffer to staging
+			{ // pump from buffer to staging
+				const size_t max_commands = 1;
+				size_t number_of_commands_done = 0;
+				std::lock_guard lg_staging{ctx->staging_mutex};
+				for (auto& [agent, buffer] : ctx->buffer) {
+					if (agent == agent_local) {
+						// skip ? self
+						continue;
+					}
+					if (number_of_commands_done >= max_commands) {
+						break;
+					}
+
+					// determain the seq we are looking for in buffer
+					uint64_t seq {0};
+					if (ctx->staging_frontier.count(agent)) {
+						seq = ctx->staging_frontier.at(agent) + 1;
+					}
+
+					if (!buffer.count(seq)) { // not in buffer, skip
+						continue;
+					}
+
+					// this can lead to dead locks, if other code does this wrong
+					std::lock_guard lg{ctx->command_lists_mutex};
+					for (; buffer.count(seq); seq++) {
+						ctx->command_lists[agent][seq] = buffer.at(seq);
+
+						number_of_commands_done++;
+						if (number_of_commands_done >= max_commands) {
+							break;
+						}
+					}
+
+					ctx->staging_frontier[agent] = seq;
+					ctx->should_gossip_remote.emplace(agent);
+				}
+			}
 
 			// request missing in buffer
 
@@ -782,10 +819,20 @@ int main(void) {
 					for (const auto& [agent, staging_seq] : ctx.staging_frontier) {
 						// check if remote newer
 						if (!ctx.command_frontier.count(agent) || ctx.command_frontier.at(agent) < staging_seq) {
-							for (uint64_t seq = ctx.command_frontier[agent]; seq <= staging_seq; seq++) {
+							uint64_t seq {0};
+							if (ctx.command_frontier.count(agent)) {
+								seq = ctx.command_frontier[agent] + 1;
+							}
+							for (; seq <= staging_seq; seq++) {
 
 								// !! this can get expensive, while we are holding locks :/
 								bool r = doc.apply(ctx.command_lists.at(agent).at(seq).ops);
+								if (!r) {
+									std::cout << "faild to apply:\n";
+									for (const auto& op : ctx.command_lists.at(agent).at(seq).ops) {
+										std::cout << "  " << op << "\n";
+									}
+								}
 								assert(r && "this should not happen");
 							}
 
@@ -844,10 +891,10 @@ int main(void) {
 				//std::cout << "new_text:\n" << new_text << "\n";
 				//std::cout << "old_text:\n" << doc.getText() << "\n";
 				std::cout << "doc state: ";
-					for (const auto& e : doc.state.list) {
-						std::cout << e << " ";
-					}
-					std::cout << "\n";
+				for (const auto& e : doc.state.list) {
+					std::cout << e << " ";
+				}
+				std::cout << "\n";
 
 				const auto ops = doc.merge(new_text);
 				if (!ops.empty()) {
@@ -860,32 +907,34 @@ int main(void) {
 				}
 				assert(doc.getText() == new_text);
 
-				// TODO: make something less locky
-				// TODO: make method
-				{
-					std::lock_guard mg{ctx.command_lists_mutex};
-					assert(ctx.command_lists.size() == ctx.command_frontier.size());
+				if (!ops.empty()) {
+					// TODO: make something less locky
+					// TODO: make method
+					{
+						std::lock_guard mg{ctx.command_lists_mutex};
+						//assert(ctx.command_lists.size() == ctx.command_frontier.size());
 
-					auto& local_command_list = ctx.command_lists[ctx.agent];
+						auto& local_command_list = ctx.command_lists[ctx.agent];
 
-					uint64_t seq {0};
-					if (ctx.command_frontier.count(ctx.agent)) { // get last own seq
-						seq = ctx.command_frontier[ctx.agent] + 1;
-					}
-					const size_t max_ops {5}; // limit ops per command so we can fit them into packets
-					for (size_t i = 0; i < ops.size(); i+=max_ops, seq++) {
-						std::vector<Doc::Op> tmp_ops {ops.cbegin()+i, ops.cbegin()+i+1};
-						assert(!tmp_ops.empty());
-
-						local_command_list.emplace(seq, Command{
-							ctx.agent,
-							seq,
-							tmp_ops
-						});
-						ctx.command_frontier[ctx.agent] = seq;
+						uint64_t seq {0};
+						if (ctx.command_frontier.count(ctx.agent)) { // get last own seq
+							seq = ctx.command_frontier[ctx.agent] + 1;
+						}
+						const size_t max_ops {5}; // limit ops per command so we can fit them into packets
+						for (size_t i = 0; i < ops.size(); i+=max_ops, seq++) {
+							std::vector<Doc::Op> tmp_ops {ops.cbegin()+i, ops.cbegin()+i+1};
+							assert(!tmp_ops.empty());
+
+							local_command_list.emplace(seq, Command{
+								ctx.agent,
+								seq,
+								tmp_ops
+							});
+							ctx.command_frontier[ctx.agent] = seq;
+						}
 					}
+					ctx.should_gossip_local.store(true);
 				}
-				ctx.should_gossip_local.store(true);
 			} else {
 				std::cout << "unknown command '" << command << "'\n";
 			}