data

import * as StellarSdk from "@stellar/stellar-sdk";

const rpc = new StellarSdk.rpc.Server("https://soroban-testnet.stellar.org");

const account = await rpc.getAccount(publicKey);
// Returns account with sequence number for transaction building

const health = await rpc.getHealth();
// { status: "healthy" }

const ledger = await rpc.getLatestLedger();
// { id: "...", sequence: 123456, protocolVersion: 25 }

// Read contract storage
const key = StellarSdk.xdr.LedgerKey.contractData(
  new StellarSdk.xdr.LedgerKeyContractData({
    contract: new StellarSdk.Address(contractId).toScAddress(),
    key: StellarSdk.xdr.ScVal.scvSymbol("Counter"),
    durability: StellarSdk.xdr.ContractDataDurability.persistent(),
  })
);

const entries = await rpc.getLedgerEntries(key);
if (entries.entries.length > 0) {
  const value = StellarSdk.scValToNative(
    entries.entries[0].val.contractData().val()
  );
}

const simulation = await rpc.simulateTransaction(transaction);

if (StellarSdk.rpc.Api.isSimulationError(simulation)) {
  console.error("Simulation failed:", simulation.error);
} else if (StellarSdk.rpc.Api.isSimulationSuccess(simulation)) {
  console.log("Cost:", simulation.cost);
  console.log("Result:", simulation.result);
}

const response = await rpc.sendTransaction(signedTransaction);

if (response.status === "PENDING") {
  // Poll for result
  let result = await rpc.getTransaction(response.hash);
  while (result.status === "NOT_FOUND") {
    await new Promise(r => setTimeout(r, 1000));
    result = await rpc.getTransaction(response.hash);
  }

  if (result.status === "SUCCESS") {
    console.log("Success:", result.returnValue);
  } else {
    console.error("Failed:", result.status);
  }
}

const tx = await rpc.getTransaction(txHash);
// status: "SUCCESS" | "FAILED" | "NOT_FOUND"
// returnValue: ScVal (for contract calls)
// ledger: number

const events = await rpc.getEvents({
  startLedger: 1000000,
  filters: [
    {
      type: "contract",
      contractIds: [contractId],
      topics: [
        ["*", StellarSdk.xdr.ScVal.scvSymbol("transfer").toXDR("base64")],
      ],
    },
  ],
});

for (const event of events.events) {
  console.log("Event:", event.topic, event.value);
}

// Horizon (old)
const account = await horizonServer.loadAccount(publicKey);

// RPC (new)
const account = await rpc.getAccount(publicKey);
// Note: RPC returns less data, just what's needed for transactions

// Horizon (for classic transactions)
const result = await horizonServer.submitTransaction(tx);

// RPC (for smart contract transactions)
const response = await rpc.sendTransaction(tx);
const result = await pollForResult(response.hash);

// Horizon - full history
const allTxs = await horizonServer
  .transactions()
  .forAccount(publicKey)
  .call();

// RPC - most methods limited to the retention window (~7 days)
// Exception: getLedgers can page further back (Infinite Scroll), but only as far
// as the chosen provider's retention or data-lake integration reaches.
// Always check the floor of the instance you're talking to first:
const { oldestLedger } = await rpc.getHealth();
// For guaranteed full history, use:
// 1. Hubble (SDF's BigQuery dataset)
// 2. Galexie (data pipeline)
// 3. Your own indexer

// Horizon - native streaming
server.payments().stream({ onmessage: handlePayment });

// RPC - polling (no native streaming)
async function pollForUpdates() {
  const lastLedger = await rpc.getLatestLedger();
  // Check for new events/transactions
  // Repeat on interval
}
setInterval(pollForUpdates, 5000);

-- Query Stellar data in BigQuery
SELECT *
FROM `crypto-stellar.crypto_stellar.history_transactions`
WHERE source_account = 'G...'
ORDER BY created_at DESC
LIMIT 100

// lib/stellar-config.ts
import * as StellarSdk from "@stellar/stellar-sdk";

type NetworkConfig = {
  rpcUrl: string;
  horizonUrl: string;
  networkPassphrase: string;
  friendbotUrl: string | null;
};

const requireEnv = (name: string): string => {
  const value = process.env[name];
  if (!value) throw new Error(`Missing required env var: ${name}`);
  return value;
};

// Lazy per-network factories: requireEnv only runs for the selected network,
// so testnet/local work without the mainnet env var set.
const configs: Record<string, () => NetworkConfig> = {
  mainnet: () => ({
    rpcUrl: requireEnv("STELLAR_MAINNET_RPC_URL"),
    horizonUrl: "https://horizon.stellar.org",
    networkPassphrase: StellarSdk.Networks.PUBLIC,
    friendbotUrl: null,
  }),
  testnet: () => ({
    rpcUrl: "https://soroban-testnet.stellar.org",
    horizonUrl: "https://horizon-testnet.stellar.org",
    networkPassphrase: StellarSdk.Networks.TESTNET,
    friendbotUrl: "https://friendbot.stellar.org",
  }),
  local: () => ({
    rpcUrl: "http://localhost:8000/soroban/rpc",
    horizonUrl: "http://localhost:8000",
    networkPassphrase: "Standalone Network ; February 2017",
    friendbotUrl: "http://localhost:8000/friendbot",
  }),
};

const network = process.env.STELLAR_NETWORK || "testnet";
const makeConfig = configs[network];
if (!makeConfig) throw new Error(`Unknown network: ${network}`);
export const config = makeConfig();

export const rpc = new StellarSdk.rpc.Server(config.rpcUrl);
export const horizon = new StellarSdk.Horizon.Server(config.horizonUrl);

// RPC errors
try {
  const result = await rpc.sendTransaction(tx);
} catch (error) {
  if (error.code === 400) {
    // Invalid transaction
  } else if (error.code === 503) {
    // Service unavailable
  }
}

// Horizon errors
try {
  const result = await horizon.submitTransaction(tx);
} catch (error) {
  const extras = error.response?.data?.extras;
  if (extras?.result_codes) {
    // Detailed error codes
    console.log("Transaction:", extras.result_codes.transaction);
    console.log("Operations:", extras.result_codes.operations);
  }
}

async function withRetry<T>(fn: () => Promise<T>, maxRetries = 3): Promise<T> {
  let lastError: Error;
  for (let i = 0; i < maxRetries; i++) {
    try {
      return await fn();
    } catch (error) {
      lastError = error;
      if (error.response?.status === 429) {
        // Rate limited - exponential backoff
        await new Promise(r => setTimeout(r, Math.pow(2, i) * 1000));
      } else {
        throw error;
      }
    }
  }
  throw lastError;
}