/**
* In-memory storage for seen operation hashes
*
* Provides double-spend protection by tracking operation hashes
* that have been verified. Note: this resets on server restart.
*/
interface SeenOperation {
operationHash: string;
source: string;
amount: string;
recipient: string;
verifiedAt: Date;
settled: boolean;
settledAt?: Date;
}
class SeenOperationsStore {
private operations: Map<string, SeenOperation> = new Map();
/**
* Check if an operation hash has been seen before
*/
has(operationHash: string): boolean {
return this.operations.has(operationHash);
}
/**
* Add an operation to the seen set
*/
add(
operationHash: string,
source: string,
amount: string,
recipient: string
): void {
this.operations.set(operationHash, {
operationHash,
source,
amount,
recipient,
verifiedAt: new Date(),
settled: false,
});
}
/**
* Mark an operation as settled
*/
markSettled(operationHash: string): boolean {
const op = this.operations.get(operationHash);
if (op) {
op.settled = true;
op.settledAt = new Date();
return true;
}
return false;
}
/**
* Check if an operation has been verified (exists in store)
*/
isVerified(operationHash: string): boolean {
return this.operations.has(operationHash);
}
/**
* Check if an operation has been settled
*/
isSettled(operationHash: string): boolean {
const op = this.operations.get(operationHash);
return op?.settled ?? false;
}
/**
* Get operation details
*/
get(operationHash: string): SeenOperation | undefined {
return this.operations.get(operationHash);
}
/**
* Get count of seen operations
*/
count(): number {
return this.operations.size;
}
/**
* Clear all seen operations (useful for testing)
*/
clear(): void {
this.operations.clear();
}
}
// Singleton instance
export const seenOperations = new SeenOperationsStore();
