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Fix migration (hopefully)

This commit is contained in:
Nicolas Werner 2020-07-26 19:04:36 +02:00
parent ade905c881
commit 720bb164f7
1 changed files with 50 additions and 3 deletions
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53
src/Cache.cpp
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@ -693,9 +693,56 @@ Cache::runMigrations()
auto room_ids = getRoomIds(txn);
for (const auto &room_id : room_ids) {
auto messagesDb = lmdb::dbi::open(
txn, std::string(room_id + "/messages").c_str(), MDB_CREATE);
lmdb::dbi_drop(txn, messagesDb, true);
try {
auto messagesDb = lmdb::dbi::open(
txn, std::string(room_id + "/messages").c_str());
// keep some old messages and batch token
{
auto roomsCursor =
lmdb::cursor::open(txn, messagesDb);
lmdb::val ts, stored_message;
bool start = true;
mtx::responses::Timeline oldMessages;
while (roomsCursor.get(ts,
stored_message,
start ? MDB_FIRST
: MDB_NEXT)) {
start = false;
auto j = json::parse(std::string_view(
stored_message.data(),
stored_message.size()));
if (oldMessages.prev_batch.empty())
oldMessages.prev_batch =
j["token"].get<std::string>();
else if (j["token"] !=
oldMessages.prev_batch)
break;
mtx::events::collections::TimelineEvent
te;
mtx::events::collections::from_json(
j["event"], te);
oldMessages.events.push_back(te.data);
}
// messages were stored in reverse order, so we
// need to reverse them
std::reverse(oldMessages.events.begin(),
oldMessages.events.end());
// save messages using the new method
saveTimelineMessages(txn, room_id, oldMessages);
}
// delete old messages db
lmdb::dbi_drop(txn, messagesDb, true);
} catch (std::exception &e) {
nhlog::db()->error(
"While migrating messages from {}, ignoring error {}",
room_id,
e.what());
}
}
txn.commit();
} catch (const lmdb::error &) {