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feat(savedata): add tier 2 integrity protections

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Strengthen savedata persistence against corruption and race conditions:

- SHA-256 checksum: hash the decompressed blob on every save, store in
  new savedata_hash column, verify on load to detect silent corruption.
  Pre-existing characters with no hash are silently upgraded on next save.
- Atomic transactions: wrap character data + house data + hash + backup
  into a single DB transaction via SaveCharacterDataAtomic, so a crash
  mid-save never leaves partial state.
- Per-character save mutex: CharacterLocks (sync.Map of charID → Mutex)
  serializes concurrent saves for the same character, preventing races
  that could defeat corruption detection. Different characters remain
  fully independent.

Migration 0008 adds the savedata_hash column to the characters table.
This commit is contained in:
Houmgaor
2026-03-17 19:21:55 +01:00
parent d578e68b79
commit 01b829d0e9
9 changed files with 319 additions and 36 deletions
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8
server/channelserver/repo_mocks_test.go
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@@ -228,8 +228,12 @@ func (m *mockCharacterRepo) SaveHouseData(_ uint32, _ []byte, _, _, _, _, _ []by
func (m *mockCharacterRepo) LoadSaveData(_ uint32) (uint32, []byte, bool, string, error) {
return m.loadSaveDataID, m.loadSaveDataData, m.loadSaveDataNew, m.loadSaveDataName, m.loadSaveDataErr
}
func (m *mockCharacterRepo) SaveBackup(_ uint32, _ int, _ []byte) error { return nil }
func (m *mockCharacterRepo) GetLastBackupTime(_ uint32) (time.Time, error) { return time.Time{}, nil }
func (m *mockCharacterRepo) SaveBackup(_ uint32, _ int, _ []byte) error { return nil }
func (m *mockCharacterRepo) GetLastBackupTime(_ uint32) (time.Time, error) { return time.Time{}, nil }
func (m *mockCharacterRepo) SaveCharacterDataAtomic(_ SaveAtomicParams) error { return nil }
func (m *mockCharacterRepo) LoadSaveDataWithHash(_ uint32) (uint32, []byte, bool, string, []byte, error) {
return m.loadSaveDataID, m.loadSaveDataData, m.loadSaveDataNew, m.loadSaveDataName, nil, m.loadSaveDataErr
}
// --- mockGoocooRepo ---