From b0168fd45b3683c2d6f61ccae67dcd5b918a363d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?louiz=E2=80=99?= Date: Sun, 29 Apr 2018 22:18:26 +0200 Subject: =?UTF-8?q?mam:=20Send=20=E2=80=9Cfin=20complete=E2=80=9D=20only?= =?UTF-8?q?=20when=20appropriate?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Also simplify how we did the whole “limit + 1” And fix one bad interpretation of the XEP for the case where the query has no after or before restriction. fix #3349 --- src/database/database.cpp | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) (limited to 'src/database/database.cpp') diff --git a/src/database/database.cpp b/src/database/database.cpp index 3b3e890..6e08ee1 100644 --- a/src/database/database.cpp +++ b/src/database/database.cpp @@ -190,12 +190,9 @@ std::string Database::store_muc_message(const std::string& owner, const std::str return uuid; } -std::vector Database::get_muc_logs(const std::string& owner, const std::string& chan_name, const std::string& server, - int limit, const std::string& start, const std::string& end, const Id::real_type reference_record_id, Database::Paging paging) +std::tuple> Database::get_muc_logs(const std::string& owner, const std::string& chan_name, const std::string& server, + std::size_t limit, const std::string& start, const std::string& end, const Id::real_type reference_record_id, Database::Paging paging) { - if (limit == 0) - return {}; - auto request = select(Database::muc_log_lines); request.where() << Database::Owner{} << "=" << owner << \ " and " << Database::IrcChanName{} << "=" << chan_name << \ @@ -228,15 +225,26 @@ std::vector Database::get_muc_logs(const std::string& owne else request.order_by() << Id{} << " DESC "; - if (limit >= 0) - request.limit() << limit; + // Just a simple trick: to know whether we got the totality of the + // possible results matching this query (except for the limit), we just + // ask one more element. If we get that additional element, this means + // we don’t have everything. And then we just discard it. If we don’t + // have more, this means we have everything. + request.limit() << limit + 1; auto result = request.execute(*Database::db); + bool complete = true; + + if (result.size() == limit + 1) + { + complete = false; + result.erase(std::prev(result.end())); + } if (paging == Database::Paging::first) - return result; + return {complete, result}; else - return {result.crbegin(), result.crend()}; + return {complete, {result.crbegin(), result.crend()}}; } Database::MucLogLine Database::get_muc_log(const std::string& owner, const std::string& chan_name, const std::string& server, -- cgit v1.2.3