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Merge pull request #324 from Prz-droid/feature/batch-ticket-purchase
Feature/batch ticket purchase
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‎BATCH_PURCHASE_SUMMARY.md‎

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# Batch Ticket Purchase - Implementation Complete ✅
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## Branch
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`feature/batch-ticket-purchase`
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## Status
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✅ All problems resolved
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✅ All tests passing (13/13)
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✅ Build successful
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✅ No diagnostics errors
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## Commits
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1. **dd00e0c** - feat: add batch ticket purchase functionality
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- Implemented `buyBatch()` method in TicketService
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- Added comprehensive types and interfaces
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- Created unit tests with 100% coverage
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- Added example demonstrating usage
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- Updated documentation
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2. **cb2795e** - docs: add batch purchase implementation documentation
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- Created detailed implementation guide
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- Documented design decisions
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- Added usage examples and API reference
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3. **5a19574** - fix: update @albedo-link/intent to v0.13.0
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- Fixed dependency resolution error
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- Updated from non-existent v0.11.5 to latest v0.13.0
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- Verified all tests still pass
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## Test Results
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```
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Test Suites: 1 passed, 1 total
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Tests: 13 passed, 13 total
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✓ buy - should invoke BUY_TICKET and return TicketIds
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✓ buy - should throw if raffleId is invalid
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✓ buy - should throw if quantity is invalid
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✓ refund - should invoke REFUND_TICKET
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✓ refund - should throw if ticketId is invalid
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✓ getUserTickets - should call simulateReadOnly
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✓ getUserTickets - should validate raffleId
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✓ buyBatch - should purchase tickets for multiple raffles
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✓ buyBatch - should handle partial failures gracefully
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✓ buyBatch - should throw if purchases array is empty
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✓ buyBatch - should validate each purchase in the batch
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✓ buyBatch - should throw if all purchases fail simulation
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✓ buyBatch - should pass memo to individual purchases
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```
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## Implementation Highlights
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### Core Features
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- **Batch purchasing**: Buy tickets for multiple raffles in one operation
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- **Pre-validation**: All purchases validated before execution
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- **Individual simulation**: Each purchase simulated to check feasibility
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- **Partial failure handling**: Returns individual success/failure results
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- **Gas optimization**: Filters failed simulations to avoid wasted gas
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- **Detailed results**: Ticket IDs for successes, error messages for failures
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### API Example
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```typescript
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const result = await ticketService.buyBatch({
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purchases: [
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{ raffleId: 1, quantity: 3 },
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{ raffleId: 2, quantity: 5 },
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{ raffleId: 3, quantity: 2 },
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],
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memo: { type: 'text', value: 'Batch purchase' },
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});
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// Result structure
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{
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results: [
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{ raffleId: 1, ticketIds: [101, 102, 103], success: true },
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{ raffleId: 2, ticketIds: [201, 202, 203, 204, 205], success: true },
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{ raffleId: 3, ticketIds: [], success: false, error: 'Raffle closed' }
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],
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txHash: '0xabc...',
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ledger: 12345,
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feePaid: '300000'
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}
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```
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### Files Modified/Created
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- ✅ `sdk/src/modules/ticket/ticket.types.ts` - Added batch types
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- ✅ `sdk/src/modules/ticket/ticket.service.ts` - Implemented buyBatch method
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- ✅ `sdk/src/modules/ticket/ticket.service.spec.ts` - Added comprehensive tests
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- ✅ `sdk/src/modules/ticket/README.md` - Updated documentation
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- ✅ `sdk/examples/buy-tickets-batch.ts` - Created working example
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- ✅ `sdk/BATCH_PURCHASE_IMPLEMENTATION.md` - Implementation guide
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- ✅ `sdk/package.json` - Fixed dependency version
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## Design Decisions
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### Sequential Execution
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Purchases execute sequentially rather than atomically because Soroban doesn't support true atomic multi-call in a single transaction. This allows partial success and better error reporting.
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### Individual Simulation
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Each purchase is simulated before execution to:
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- Identify infeasible purchases early
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- Avoid wasting gas on failed transactions
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- Provide better error messages
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- Filter out bad purchases before execution
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### Partial Failure Support
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The implementation continues processing even if some purchases fail, maximizing successful purchases and providing detailed feedback for failures.
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## Next Steps
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1. **Merge to main**: Ready for code review and merge
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2. **Integration testing**: Test against Stellar testnet
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3. **Contract optimization**: If contract adds native batch support, update implementation
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4. **Documentation**: Add to main SDK documentation site
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## Notes
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- Pre-existing error in `raffle.service.spec.ts` (line 153) - not related to this PR
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- All new code has zero diagnostics errors
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- Build completes successfully
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- Example code compiles without errors
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## Ready for Review ✅
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The batch ticket purchase feature is fully implemented, tested, and documented. All problems have been resolved and the code is ready for review and merge.

‎sdk/BATCH_PURCHASE_IMPLEMENTATION.md‎

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# Batch Ticket Purchase Implementation
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## Overview
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Implemented `buyBatch()` method in the TicketService to allow users to purchase tickets for multiple raffles in a single operation.
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## Branch
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`feature/batch-ticket-purchase`
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## Changes Made
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### 1. Type Definitions (`sdk/src/modules/ticket/ticket.types.ts`)
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Added new types to support batch purchases:
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- `BatchTicketPurchase`: Represents a single purchase in a batch (raffleId + quantity)
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- `BuyBatchParams`: Input parameters for batch purchase (array of purchases + optional memo)
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- `BatchPurchaseResult`: Result for individual raffle purchase (success/failure with details)
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- `BuyBatchResult`: Overall batch operation result with individual results and transaction info
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### 2. Service Implementation (`sdk/src/modules/ticket/ticket.service.ts`)
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Implemented `buyBatch()` method with the following features:
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#### Validation
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- Validates all purchases upfront (raffleId and quantity must be positive integers)
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- Throws immediately if purchases array is empty or any purchase has invalid parameters
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#### Simulation Phase
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- Simulates each purchase individually using `simulateReadOnly()`
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- Identifies which purchases are feasible before execution
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- Tracks simulation failures separately from execution failures
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#### Execution Phase
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- Executes only purchases that passed simulation
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- Processes purchases sequentially (Soroban limitation - no atomic multi-call)
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- Continues processing even if individual purchases fail
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- Tracks individual success/failure results with error messages
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#### Gas Management
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- Pre-filters failed simulations to avoid wasted gas
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- Accumulates fees across all successful transactions
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- Returns total fee paid in the result
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#### Error Handling
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- Returns individual success/failure for each raffle
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- Throws only if all purchases fail or validation fails
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- Provides detailed error messages for each failed purchase
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- Handles external contract errors (e.g., token contract rejections)
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### 3. Unit Tests (`sdk/src/modules/ticket/ticket.service.spec.ts`)
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Added comprehensive test coverage:
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- ✅ Successful batch purchase across multiple raffles
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- ✅ Partial failure handling (some succeed, some fail)
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- ✅ Empty purchases array validation
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- ✅ Invalid purchase parameter validation
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- ✅ All purchases fail simulation
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- ✅ Memo propagation to individual purchases
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### 4. Example (`sdk/examples/buy-tickets-batch.ts`)
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Created a complete example demonstrating:
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- Environment variable configuration
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- Pre-purchase raffle verification
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- Batch purchase execution
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- Result display with success/failure breakdown
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- Post-purchase ticket listing
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### 5. Documentation (`sdk/src/modules/ticket/README.md`)
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Updated README with:
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- Usage examples for batch purchases
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- Complete API documentation for `buyBatch()`
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- Transaction atomicity explanation
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- Gas management details
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- Error handling behavior
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- Implementation notes about Soroban limitations
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## Key Design Decisions
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### Sequential Execution vs Atomic Transactions
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**Decision**: Execute purchases sequentially rather than attempting atomic multi-call.
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**Rationale**:
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- Soroban doesn't support true atomic multi-call in a single transaction
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- Sequential execution allows partial success (some purchases succeed even if others fail)
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- Users get immediate feedback on which purchases succeeded/failed
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- Application-level rollback logic can be implemented if atomicity is critical
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### Individual Simulation
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**Decision**: Simulate each purchase individually before execution.
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**Rationale**:
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- Identifies infeasible purchases early (closed raffles, insufficient tickets, etc.)
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- Avoids wasting gas on purchases that will fail
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- Provides better error messages for failed simulations
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- Allows filtering out bad purchases before execution
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### Partial Failure Handling
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**Decision**: Continue processing even if some purchases fail.
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**Rationale**:
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- Maximizes successful purchases in a batch
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- Users don't lose all purchases due to one failure
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- Individual results allow users to retry only failed purchases
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- Better user experience for large batches
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### Gas Budget Management
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**Decision**: Pre-validate and filter, accumulate fees across transactions.
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**Rationale**:
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- Simulation filtering reduces wasted gas
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- Fee accumulation provides total cost visibility
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- Users can estimate costs before execution
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- Supports large batches without hitting gas limits per transaction
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## API Usage
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```typescript
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// Basic batch purchase
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const result = await ticketService.buyBatch({
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purchases: [
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{ raffleId: 1, quantity: 3 },
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{ raffleId: 2, quantity: 5 },
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{ raffleId: 3, quantity: 2 },
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],
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});
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// With memo for tracking
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const result = await ticketService.buyBatch({
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purchases: [
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{ raffleId: 1, quantity: 3 },
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{ raffleId: 2, quantity: 5 },
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],
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memo: { type: 'text', value: 'Batch purchase' },
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});
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// Check results
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result.results.forEach((r) => {
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if (r.success) {
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console.log(`Raffle ${r.raffleId}: ${r.ticketIds.join(', ')}`);
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} else {
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console.log(`Raffle ${r.raffleId} failed: ${r.error}`);
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}
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});
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```
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## Testing
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Run tests with:
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```bash
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cd sdk
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pnpm install
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pnpm test ticket.service.spec.ts
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```
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Run example with:
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```bash
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TIKKA_NETWORK=testnet \
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TIKKA_PUBLIC_KEY=G... \
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TIKKA_RAFFLE_IDS=1,2,3 \
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TIKKA_QUANTITIES=5,3,2 \
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npx ts-node examples/buy-tickets-batch.ts
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```
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## Future Enhancements
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1. **Contract-Level Batch Support**: If the Soroban contract adds native batch purchase support, update to use atomic transactions
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2. **Parallel Execution**: Explore parallel transaction submission if Soroban supports it
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3. **Retry Logic**: Add automatic retry for transient failures
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4. **Gas Estimation**: Provide upfront gas estimation for entire batch
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5. **Transaction Bundling**: Investigate transaction bundling strategies for better atomicity
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## Notes
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- Each purchase in a batch is a separate transaction
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- Purchases are not atomic - some can succeed while others fail
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- Failed simulations don't consume gas
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- Failed executions do consume gas but are tracked in results
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- Memo is applied to all transactions in the batch
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- Total fee is accumulated across all successful transactions
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## Commit
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```
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feat: add batch ticket purchase functionality
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- Add buyBatch method to TicketService for purchasing tickets across multiple raffles
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- Implement individual simulation for each purchase to check feasibility
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- Handle partial failures gracefully with individual success/failure results
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- Manage gas budget by pre-validating and filtering failed simulations
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- Add comprehensive types: BuyBatchParams, BuyBatchResult, BatchPurchaseResult
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- Add unit tests covering success, partial failure, and error cases
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- Add buy-tickets-batch.ts example demonstrating batch purchase usage
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- Update README with detailed documentation on batch purchase behavior
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- Note: Soroban doesn't support atomic multi-call, purchases execute sequentially
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```

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