ircd:Ⓜ️:sync: Add inline sequence extraction logic from token.

modules/client: Update sites parsing since tokens.

include/ircd/m/sync/since.h

@@ -15,8 +15,19 @@ namespace ircd::m::sync
 {
 	using since = std::tuple<event::idx, event::idx, string_view>;
 
+	event::idx sequence(const since &);
+	since make_since(const string_view &);
 	string_view make_since(const mutable_buffer &, const m::events::range &, const string_view &flags = {});
 	string_view make_since(const mutable_buffer &, const int64_t &, const string_view &flags = {});
-
-	since make_since(const string_view &);
+}
+
+inline ircd::m::event::idx
+ircd::m::sync::sequence(const since &since)
+{
+	const auto &[token, snapshot, flags]
+	{
+		since
+	};
+
+	return snapshot?: token?: -1UL;
 }

modules/client/keys/query.cc

@@ -137,11 +137,16 @@ post__keys_query(client &client,
 		std::clamp(request.get("timeout", timeout_default), timeout_min, timeout_max)
 	};
 
-	const auto &token
+	const json::string token
 	{
 		request["token"]
 	};
 
+	const m::event::idx since
+	{
+		m::sync::sequence(m::sync::make_since(token))
+	};
+
 	const json::object &request_keys
 	{
 		request.at("device_keys")

modules/client/rooms/members.cc

@@ -55,16 +55,9 @@ get__members(client &client,
 	// an event_idx sequence integer, except during phased-polylog sync
 	// when this is a negative integer. If this is phased sync, we can
 	// parse this token for the snapshot integer.
-	const auto &[since, snapshot, flags]
+	const m::event::idx at_idx
 	{
-		m::sync::make_since(at)
-	};
-
-	const auto &at_idx
-	{
-		snapshot?:
-		since?:
-			-1UL
+		m::sync::sequence(m::sync::make_since(at))
 	};
 
 	const m::room room