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https://github.com/Mezeporta/Erupe.git
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01b829d0e9
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.
26 lines
823 B
Go
26 lines
823 B
Go
package channelserver
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import "sync"
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// CharacterLocks provides per-character mutexes to serialize save operations.
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// This prevents concurrent saves for the same character from racing, which
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// could defeat corruption detection (e.g. house tier snapshot vs. write).
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//
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// The underlying sync.Map grows lazily — entries are created on first access
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// and never removed (character IDs are bounded and reused across sessions).
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type CharacterLocks struct {
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m sync.Map // map[uint32]*sync.Mutex
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}
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// Lock acquires the mutex for the given character and returns an unlock function.
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// Usage:
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//
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// unlock := s.server.charSaveLocks.Lock(charID)
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// defer unlock()
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func (cl *CharacterLocks) Lock(charID uint32) func() {
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val, _ := cl.m.LoadOrStore(charID, &sync.Mutex{})
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mu := val.(*sync.Mutex)
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mu.Lock()
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return mu.Unlock
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}
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