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nostrdb: don't begin query if we have a bad lmdb env

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In some weird multithreaded situations after we close the database,
this can be an issue.
This commit is contained in:
William Casarin 2023-12-11 14:43:12 -08:00
parent 92df446d72
commit c7cc8df5ba
1 changed files with 3 additions and 1 deletions
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4
nostrdb/nostrdb.c
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@ -864,7 +864,9 @@ static int _ndb_begin_query(struct ndb *ndb, struct ndb_txn *txn, int flags)
{
txn->lmdb = &ndb->lmdb;
MDB_txn **mdb_txn = (MDB_txn **)&txn->mdb_txn;
return mdb_txn_begin(txn->lmdb->env, NULL, flags, mdb_txn) == 0;
if (!txn->lmdb->env)
return 0;
return mdb_txn_begin(txn->lmdb->env, NULL, flags, mdb_txn) == 0;
}
int ndb_begin_query(struct ndb *ndb, struct ndb_txn *txn)