[ubermensh-323]

Summary

Add metrics collection, typed events, transaction tracking, and Asset Pool integration

What was solved

#1140 — Add performance metrics

Add a performance metrics subsystem to the SDK: a lightweight metrics collector that records RPC request latency, cache hit/miss rates, and batch operation performance, plus an export API producing standard-format (e.g., Prometheus/JSON) metrics for monitoring integration. Wire collection into existing RPC/cache/batch paths with minimal overhead and expose historical/aggregated metrics.

Addressed:

• Changed: src/analyticsTracking.ts, src/analyticsDashboardExporter.ts
• Implement a metrics collection system (counters, histograms/timers, gauges) with minimal runtime overhead
• Track RPC request latency (per-method timing and aggregation)
• Track cache hit/miss rates

#1141 — Implement event emitter

Add a typed event emitter to the SDK that emits state-change and transaction lifecycle events, supports registration/deregistration, filtering, and async handlers without leaking listeners.

Addressed:

• Changed: src/events/eventEmitter.ts, src/events/types.ts
• Design an intuitive event emitter interface (typed events, on/off/once/emit)
• Implement event registration and deregistration
• Add transaction lifecycle events (e.g., submitted/confirmed/failed)

#1142 — Add transaction event tracking

Add a transaction event tracking system that emits structured events for each transaction lifecycle step (created, simulated, signed, submitted, confirmed) plus error events, so the UI can track transaction progress. This requires a small event schema/emitter module and wiring it into the existing transaction flow.

Addressed:

• Changed: src/transactionEvents.ts, src/transactionBuilder.ts, src/transactionSigner.ts
• Design a transaction event schema covering created, simulated, signed, submitted, confirmed, and error events
• Emit an event on transaction creation
• Emit an event on simulation

#1159 — Implement Stellar Asset Pool integration for liquidity

Add a Stellar Asset Pool integration layer to the SDK covering pool interaction, liquidity provider support, swap routing, slippage calculation, and pool monitoring. The repo already has an AMM calculator (src/ammCalculator.ts) and price oracle, so the contribution should build on those patterns with a focused pool module plus tests, staying within the issue's stated scope.

Addressed:

• Changed: src/ammCalculator.ts
• Research and model Stellar Asset Pool protocol interactions (pool reserves, share accounting)
• Implement a pool interaction layer for querying pools and building deposit/withdraw/swap operations
• Add liquidity provider support (deposit/withdraw liquidity, LP share tracking)

Changes

• src/analyticsTracking.ts (modify)
• src/analyticsDashboardExporter.ts (modify)
• src/events/eventEmitter.ts (create)
• src/events/types.ts (create)
• src/transactionEvents.ts (create)
• src/transactionBuilder.ts (create)
• src/transactionSigner.ts (create)
• src/ammCalculator.ts (modify)

Approach

1. Add performance metrics #1140 — Add performance metrics (Changed: src/analyticsTracking.ts, src/analyticsDashboardExporter.ts)
2. Implement event emitter #1141 — Implement event emitter (Changed: src/events/eventEmitter.ts, src/events/types.ts)
3. Add transaction event tracking #1142 — Add transaction event tracking (Changed: src/transactionEvents.ts, src/transactionBuilder.ts, src/transactionSigner.ts)
4. Implement Stellar Asset Pool integration for liquidity #1159 — Implement Stellar Asset Pool integration for liquidity (Changed: src/ammCalculator.ts)

Issues

Closes #1140
Closes #1141
Closes #1142
Closes #1159

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