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feat: architecture diagram + RPC rate-limiting with exponential backoff #212

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30 changes: 30 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
# TurboLong

Leveraged long positions on [Blend Protocol](https://blend.capital) — Stellar / Soroban.

## Architecture

![Architecture diagram](docs/diagrams/architecture.svg)

| Layer | Description |
|---|---|
| **User** | Interacts via browser |
| **Wallet** | Freighter, xBull, Albedo, Lobstr, Hana — signs XDR |
| **Frontend** | `blend.ts` + `main.ts` — builds transactions, rate-limits RPC calls with exponential backoff |
| **Soroban RPC** | Simulates and submits Soroban transactions |
| **Blend Pool** | `submit_with_allowance` — atomic supply / borrow / repay / withdraw |
| **b / d Tokens** | bToken = collateral receipt, dToken = debt receipt |

## Quickstart

```bash
cd frontend
npm install
npm run dev
```

## Docs

- [`doc.md`](doc.md) — strategy overview
- [`profitability_analysis.md`](profitability_analysis.md) — rate and profit modelling
- [`CONTRIBUTING.md`](CONTRIBUTING.md) — contribution guide
79 changes: 79 additions & 0 deletions docs/diagrams/architecture.svg
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53 changes: 30 additions & 23 deletions frontend/src/blend.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -334,14 +334,21 @@ function buildRequestsVec(items: xdr.ScVal[]): xdr.ScVal {

// ── RPC retry helper ──────────────────────────────────────────────────────────

async function withRetry<T>(fn: () => Promise<T>, retries = 2, delayMs = 1000): Promise<T> {
async function withRetry<T>(fn: () => Promise<T>, retries = 4, baseDelayMs = 500): Promise<T> {
for (let attempt = 0; ; attempt++) {
try {
return await fn();
} catch (e) {
} catch (e: any) {
if (attempt >= retries) throw e;
console.warn(`RPC call failed (attempt ${attempt + 1}/${retries + 1}), retrying in ${delayMs}ms...`);
await new Promise(r => setTimeout(r, delayMs));
const is429 = e?.status === 429 || e?.response?.status === 429 ||
String(e?.message ?? e).includes("429");
const delay = baseDelayMs * Math.pow(2, attempt) + Math.random() * 300;
if (is429) {
console.warn(`[rpc] 429 rate-limited — backing off ${Math.round(delay)}ms (attempt ${attempt + 1}/${retries + 1})`);
} else {
console.warn(`[rpc] call failed (attempt ${attempt + 1}/${retries + 1}), retrying in ${Math.round(delay)}ms...`);
}
await new Promise(r => setTimeout(r, delay));
}
}
}
Expand Down Expand Up @@ -873,10 +880,10 @@ export async function buildApproveXdr(
const token = new Contract(assetId);
const addrScVal = new Address(userAddress).toScVal();
const poolScVal = new Address(pool.id).toScVal();
const ledger = await server.getLatestLedger();
const ledger = await withRetry(() => server.getLatestLedger());
const expiry = ledger.sequence + 120;

const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
Expand All @@ -890,7 +897,7 @@ export async function buildApproveXdr(
))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Approve simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand All @@ -908,15 +915,15 @@ export async function buildOpenPositionXdr(
const addrScVal = new Address(userAddress).toScVal();
const requests = buildRequestsVec(buildOpenRequests(asset.id, initialStroops, cFactorBn, leverage));

const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
})
.addOperation(poolContract.call("submit_with_allowance", addrScVal, addrScVal, addrScVal, requests))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Open position simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand Down Expand Up @@ -955,15 +962,15 @@ export async function buildCloseSubmitXdr(

const poolContract = new Contract(pool.id);
const addrScVal = new Address(userAddress).toScVal();
const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
})
.addOperation(poolContract.call("submit_with_allowance", addrScVal, addrScVal, addrScVal, requests))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Close simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand Down Expand Up @@ -992,15 +999,15 @@ export async function buildRepayXdr(

const poolContract = new Contract(pool.id);
const addrScVal = new Address(userAddress).toScVal();
const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
})
.addOperation(poolContract.call("submit_with_allowance", addrScVal, addrScVal, addrScVal, requests))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Repay simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand All @@ -1023,15 +1030,15 @@ export async function buildWithdrawXdr(

const poolContract = new Contract(pool.id);
const addrScVal = new Address(userAddress).toScVal();
const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
})
.addOperation(poolContract.call("submit_with_allowance", addrScVal, addrScVal, addrScVal, requests))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Withdraw simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand Down Expand Up @@ -1079,15 +1086,15 @@ export async function buildClaimXdr(
tokenIds.map(id => nativeToScVal(id, { type: "u32" }))
);

const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
})
.addOperation(poolContract.call("claim", addrScVal, tokenIds_scv, addrScVal))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Claim simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand Down Expand Up @@ -1143,15 +1150,15 @@ export async function buildIncreaseLeverageXdr(
const requests = buildRequestsVec(items);
const poolContract = new Contract(pool.id);
const addrScVal = new Address(userAddress).toScVal();
const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
})
.addOperation(poolContract.call("submit_with_allowance", addrScVal, addrScVal, addrScVal, requests))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Increase leverage simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand Down Expand Up @@ -1185,15 +1192,15 @@ export async function buildDecreaseLeverageXdr(

const poolContract = new Contract(pool.id);
const addrScVal = new Address(userAddress).toScVal();
const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
})
.addOperation(poolContract.call("submit_with_allowance", addrScVal, addrScVal, addrScVal, requests))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Decrease leverage simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand All @@ -1218,15 +1225,15 @@ export async function buildResupplyXdr(

const poolContract = new Contract(pool.id);
const addrScVal = new Address(userAddress).toScVal();
const acc = await server.getAccount(userAddress);
const acc = await withRetry(() => server.getAccount(userAddress));
const tx = new TransactionBuilder(acc, {
fee: (BigInt(BASE_FEE) * 10n).toString(),
networkPassphrase: _cfg.passphrase,
})
.addOperation(poolContract.call("submit_with_allowance", addrScVal, addrScVal, addrScVal, requests))
.setTimeout(60).build();

const sim = await server.simulateTransaction(tx);
const sim = await withRetry(() => server.simulateTransaction(tx));
if (!SorobanRpc.Api.isSimulationSuccess(sim))
throw new Error(`Resupply simulation failed: ${(sim as SorobanRpc.Api.SimulateTransactionErrorResponse).error}`);
return SorobanRpc.assembleTransaction(tx, sim).build().toXDR();
Expand Down