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ndb/txn: make transactions failable

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Since there may be situations where we close and re-open the database,
we need to make sure transactions fail when the database is not open.

Make NdbTxn an init?() constructor and check for ndb.closed. If it's
closed, then fail transaction construction.

This fixes crashes during high database activity when switching from
background to foreground and vice-versa.

Fixes: da2bdad18d ("nostrdb: close database when backgrounded")
This commit is contained in:
William Casarin
2023-12-12 12:45:56 -08:00
parent 227734d286
commit bfad2ab42d
42 changed files with 126 additions and 107 deletions
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2
damus/Models/ZapsModel.swift
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@@ -55,7 +55,7 @@ class ZapsModel: ObservableObject {
break
case .eose:
let events = state.events.lookup_zaps(target: target).map { $0.request.ev }
let txn = NdbTxn(ndb: state.ndb)
guard let txn = NdbTxn(ndb: state.ndb) else { return }
load_profiles(context: "zaps_model", profiles_subid: profiles_subid, relay_id: relay_id, load: .from_events(events), damus_state: state, txn: txn)
case .event(_, let ev):
guard ev.kind == 9735,