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Reset cache on breaking changes

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fixes #154
This commit is contained in:
Konstantinos Sideris 2017-12-10 12:51:44 +02:00
parent bbe69a4fb6
commit d872b1060b
3 changed files with 50 additions and 1 deletions
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3
include/Cache.h
View file

@ -39,6 +39,9 @@ public:
void removeRoom(const QString &roomid);
void setup();
bool isFormatValid();
void setCurrentFormat();
private:
void setNextBatchToken(lmdb::txn &txn, const QString &token);
void insertRoomState(lmdb::txn &txn, const QString &roomid, const RoomState &state);

42
src/Cache.cc
View file

@ -24,8 +24,10 @@
#include "Cache.h"
#include "RoomState.h"
static const std::string CURRENT_CACHE_FORMAT_VERSION("2017.12.10");
static const lmdb::val NEXT_BATCH_KEY("next_batch");
static const lmdb::val transactionID("transaction_id");
static const lmdb::val CACHE_FORMAT_VERSION_KEY("cache_format_version");
Cache::Cache(const QString &userId)
: env_{nullptr}
@ -270,3 +272,41 @@ Cache::deleteData()
if (!cacheDirectory_.isEmpty())
QDir(cacheDirectory_).removeRecursively();
}
bool
Cache::isFormatValid()
{
auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
lmdb::val current_version;
bool res = lmdb::dbi_get(txn, stateDb_, CACHE_FORMAT_VERSION_KEY, current_version);
txn.commit();
if (!res)
return false;
std::string stored_version(current_version.data(), current_version.size());
if (stored_version != CURRENT_CACHE_FORMAT_VERSION) {
qWarning() << "Stored format version" << QString::fromStdString(stored_version);
qWarning() << "There are breaking changes in the cache format.";
return false;
}
return true;
}
void
Cache::setCurrentFormat()
{
auto txn = lmdb::txn::begin(env_);
lmdb::dbi_put(
txn,
stateDb_,
CACHE_FORMAT_VERSION_KEY,
lmdb::val(CURRENT_CACHE_FORMAT_VERSION.data(), CURRENT_CACHE_FORMAT_VERSION.size()));
txn.commit();
}

6
src/ChatPage.cc
View file

@ -334,6 +334,12 @@ ChatPage::bootstrap(QString userid, QString homeserver, QString token)
try {
cache_->setup();
if (!cache_->isFormatValid()) {
cache_->deleteData();
cache_->setup();
cache_->setCurrentFormat();
}
if (cache_->isInitialized()) {
loadStateFromCache();
return;