feat: implement Melt SAGA pattern for atomic melt operations#875
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a1denvalu3 wants to merge 1 commit intocashubtc:mainfrom
Draft
feat: implement Melt SAGA pattern for atomic melt operations#875a1denvalu3 wants to merge 1 commit intocashubtc:mainfrom
a1denvalu3 wants to merge 1 commit intocashubtc:mainfrom
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Summary
This PR implements the SAGA pattern for melt operations to ensure atomicity and crash recovery. It introduces a state machine (
MeltSaga) that persists the operation state before and after critical side effects (Lightning payments).Changes
cashu/mint/melt_saga.py: AddedMeltSagaclass handling theSetup -> Payment -> Finalize/Compensatelifecycle.cashu/mint/ledger.py:melt()to useMeltSaga.recover_incomplete_melt_sagas()to check for and recover/rollback incomplete operations on startup.cashu/core/base.py: AddedMeltSagaStateenum andSagamodel.cashu/mint/migrations.py: Added database migration forsaga_statetable.tests/mint/test_mint_melt_saga.py.Motivation
To prevent inconsistent states (e.g., proofs spent but invoice unpaid, or invoice paid but proofs unspent) in case of mint crashes or network failures during the melt process.