ircd:Ⓜ️:gossip: Implement multi-round loop; add console cmds.

include/ircd/m/gossip.h

@@ -31,6 +31,7 @@ struct ircd::m::gossip
 
 	const struct opts &opts;
 	std::list<result> requests;
+	std::set<uint128_t> attempts;
 
   private:
 	bool full() const noexcept;
@@ -41,7 +42,7 @@ struct ircd::m::gossip
 	bool start(const event::id &, const string_view &);
 	bool submit(const event::id &, const string_view &);
 	bool handle_head(const m::event &);
-	void gossip_head();
+	bool gossip_head();
 
   public:
 	gossip(const struct opts &);

matrix/gossip.cc

@@ -29,31 +29,83 @@ ircd::m::gossip::log
 ircd::m::gossip::gossip::gossip(const struct opts &opts)
 :opts{opts}
 {
-	gossip_head();
+	for(size_t i(0); i < opts.rounds; ++i)
+		if(!gossip_head())
+			break;
 }
 
 ircd::m::gossip::~gossip()
-noexcept
+noexcept try
 {
+	while(!requests.empty())
+		while(handle());
+}
+catch(const ctx::interrupted &)
+{
+	return;
+}
+catch(const ctx::terminated &)
+{
+	return;
 }
 
-void
+bool
 ircd::m::gossip::gossip_head()
 {
+	bool ret
+	{
+		false
+	};
+
+	if(opts.hint && opts.hint_only && opts.room.event_id)
+	{
+		m::event result;
+		result.event_id = opts.room.event_id;
+		json::get<"origin"_>(result) = opts.hint;
+		ret |= handle_head(result);
+		return ret;
+	}
+
+	if(opts.hint && opts.hint_only)
+	{
+		const unique_mutable_buffer buf
+		{
+			16_KiB
+		};
+
+		const auto event
+		{
+			m::room::head::fetch::one(buf, opts.room, opts.hint)
+		};
+
+		m::for_each(event::prev{event}, [this, &ret]
+		(const event::id &event_id)
+		{
+			m::event result;
+			json::get<"origin"_>(result) = opts.hint;
+			result.event_id = event_id;
+			ret |= handle_head(result);
+			return true;
+		});
+
+		return ret;
+	}
+
 	m::room::head::fetch::opts hfopts;
 	hfopts.room_id = opts.room.room_id;
 	hfopts.top = m::top(opts.room.room_id);
+	hfopts.existing = true;
 	m::room::head::fetch
 	{
-		hfopts, [this](const m::event &result)
+		hfopts, [this, &ret]
+		(const m::event &result)
 		{
-			// Bail if interrupted
-			if(ctx::interruption_requested())
-				return false;
-
-			return handle_head(result);
+			ret |= handle_head(result);
+			return true;
 		}
 	};
+
+	return ret;
 }
 
 bool
@@ -69,34 +121,43 @@ ircd::m::gossip::handle_head(const m::event &result)
 		submit(result.event_id, remote)
 	};
 
-	log::debug
-	{
-		log, "Gossip %s in %s to '%s' submit:%b requests:%zu",
-		string_view{result.event_id},
-		string_view{opts.room.room_id},
-		remote,
-		submitted,
-		requests.size(),
-	};
-
-	return true;
+	return submitted;
 }
 
 bool
 ircd::m::gossip::submit(const m::event::id &event_id,
                         const string_view &remote)
 {
-	const bool ret
+	const auto hash
 	{
-		!started(event_id, remote)?
+		(uint128_t(ircd::hash(remote)) << 64) |
+		(uint128_t(ircd::hash(event_id)) >> 64)
+	};
+
+	auto it
+	{
+		attempts.lower_bound(hash)
+	};
+
+	const bool exists
+	{
+		it != end(attempts) && *it == hash
+	};
+
+	if(!exists)
+		it = attempts.emplace_hint(it, hash);
+
+	const bool submitted
+	{
+		!exists && !started(event_id, remote)?
 			start(event_id, remote):
 			false
 	};
 
-	if(ret || full())
+	if(submitted || full())
 		while(handle());
 
-	return ret;
+	return submitted;
 }
 
 bool
@@ -109,17 +170,25 @@ try
 		48
 	};
 
-	const m::event::refs refs
+	const auto event_idx_
 	{
 		m::index(std::nothrow, event_id_)
 	};
 
-	size_t num{0};
+	const m::event::refs refs
+	{
+		event_idx_
+	};
+
+	size_t num{0}, i{0};
 	std::array<event::idx, max> next_idx;
-	refs.for_each(dbs::ref::NEXT, [&next_idx, &num]
+	refs.for_each(dbs::ref::NEXT, [this, &next_idx, &num]
 	(const event::idx &event_idx, const auto &ref_type)
 	{
 		assert(ref_type == dbs::ref::NEXT);
+		if(event_idx < opts.ref.first || event_idx > opts.ref.second)
+			return true;
+
 		next_idx.at(num) = event_idx;
 		return ++num < next_idx.size();
 	});
@@ -159,11 +228,29 @@ try
 		};
 
 		m::event::fetch event;
-		for(size_t i(0); i < num; ++i)
-			if(seek(std::nothrow, event, next_idx.at(i)))
-				pdus.append(event.source);
+		for(i = 0; i < num; ++i)
+		{
+			if(!seek(std::nothrow, event, next_idx.at(i)))
+				continue;
+
+			pdus.append(event.source);
+			log::debug
+			{
+				log, "Gossip %zu/%zu in %s for %s to '%s' %s idx:%lu",
+				i,
+				num,
+				string_view{opts.room.room_id},
+				string_view{event_id_},
+				remote_,
+				string_view{event.event_id},
+				event.event_idx,
+			};
+		}
 	}
 
+	if(!i)
+		return false;
+
 	const string_view txn
 	{
 		out.completed()
@@ -190,6 +277,19 @@ try
 	consume(buf, size(event_id));
 	assert(!empty(buf));
 
+	char pbuf[48];
+	log::debug
+	{
+		log, "Gossip %zu/%zu in %s for %s to '%s' txn[%s] %s",
+		i,
+		num,
+		string_view{opts.room.room_id},
+		string_view{event_id_},
+		remote_,
+		txnid,
+		pretty(pbuf, iec(size(txn))),
+	};
+
 	m::fed::send::opts fedopts;
 	fedopts.remote = remote;
 	requests.emplace_back(result
@@ -290,7 +390,7 @@ try
 			string_view{event_id},
 			string_view{opts.room.room_id},
 			string_view{result.remote},
-			!ok? " :"_sv: ""_sv,
+			!ok? " :"_sv: " "_sv,
 			string_view{errors},
 		};
 	});

modules/console.cc

@@ -11158,6 +11158,81 @@ console_cmd__room__acquire(opt &out, const string_view &line)
 	return true;
 }
 
+bool
+console_cmd__room__gossip__list(opt &out, const string_view &line)
+{
+	size_t i(0);
+	for(const auto *const &a : m::gossip::list)
+	{
+		size_t j(0);
+		for(const auto &result : a->requests)
+			out
+			<< std::left << std::setw(4) << i
+			<< " "
+			<< std::left << std::setw(4) << j++
+			<< " "
+			<< std::left << std::setw(50) << trunc(a->opts.room.room_id, 40)
+			<< " ["
+			<< std::right << std::setw(7) << a->opts.depth.first
+			<< " "
+			<< std::right << std::setw(7) << a->opts.depth.second
+			<< " | "
+			<< std::right << std::setw(8) << a->opts.ref.first
+			<< " "
+			<< std::right << std::setw(8) << long(a->opts.ref.second)
+			<< "] "
+			<< std::endl;
+
+		i++;
+	}
+
+	return true;
+}
+
+bool
+console_cmd__room__gossip(opt &out, const string_view &line)
+{
+	const params param{line, " ",
+	{
+		"room_id", "remote", "rounds"
+	}};
+
+	if(!param["room_id"])
+		return console_cmd__room__gossip__list(out, line);
+
+	const auto &room_id
+	{
+		m::room_id(param.at("room_id"))
+	};
+
+	const auto remote
+	{
+		param["remote"]
+	};
+
+	const auto rounds
+	{
+		param.at("rounds", -1UL)
+	};
+
+	const m::room room
+	{
+		room_id
+	};
+
+	struct m::gossip::opts opts;
+	opts.room = room;
+	opts.hint = remote != "*"? remote: string_view{};
+	opts.hint_only = !opts.hint.empty();
+	opts.rounds = rounds;
+	m::gossip gossip
+	{
+		opts
+	};
+
+	return true;
+}
+
 bool
 console_cmd__room__messages(opt &out, const string_view &line)
 {